diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/stb_image.h | 7988 | ||||
| -rw-r--r-- | lib/stb_image_resize2.h | 10601 | ||||
| -rw-r--r-- | lib/stb_image_write.h | 1724 |
3 files changed, 20313 insertions, 0 deletions
diff --git a/lib/stb_image.h b/lib/stb_image.h new file mode 100644 index 0000000..9eedabe --- /dev/null +++ b/lib/stb_image.h @@ -0,0 +1,7988 @@ +/* stb_image - v2.30 - public domain image loader - http://nothings.org/stb + no warranty implied; use at your own risk + + Do this: + #define STB_IMAGE_IMPLEMENTATION + before you include this file in *one* C or C++ file to create the implementation. + + // i.e. it should look like this: + #include ... + #include ... + #include ... + #define STB_IMAGE_IMPLEMENTATION + #include "stb_image.h" + + You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. + And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free + + + QUICK NOTES: + Primarily of interest to game developers and other people who can + avoid problematic images and only need the trivial interface + + JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) + PNG 1/2/4/8/16-bit-per-channel + + TGA (not sure what subset, if a subset) + BMP non-1bpp, non-RLE + PSD (composited view only, no extra channels, 8/16 bit-per-channel) + + GIF (*comp always reports as 4-channel) + HDR (radiance rgbE format) + PIC (Softimage PIC) + PNM (PPM and PGM binary only) + + Animated GIF still needs a proper API, but here's one way to do it: + http://gist.github.com/urraka/685d9a6340b26b830d49 + + - decode from memory or through FILE (define STBI_NO_STDIO to remove code) + - decode from arbitrary I/O callbacks + - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) + + Full documentation under "DOCUMENTATION" below. + + +LICENSE + + See end of file for license information. + +RECENT REVISION HISTORY: + + 2.30 (2024-05-31) avoid erroneous gcc warning + 2.29 (2023-05-xx) optimizations + 2.28 (2023-01-29) many error fixes, security errors, just tons of stuff + 2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes + 2.26 (2020-07-13) many minor fixes + 2.25 (2020-02-02) fix warnings + 2.24 (2020-02-02) fix warnings; thread-local failure_reason and flip_vertically + 2.23 (2019-08-11) fix clang static analysis warning + 2.22 (2019-03-04) gif fixes, fix warnings + 2.21 (2019-02-25) fix typo in comment + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs + 2.19 (2018-02-11) fix warning + 2.18 (2018-01-30) fix warnings + 2.17 (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings + 2.16 (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes + 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs + 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 + RGB-format JPEG; remove white matting in PSD; + allocate large structures on the stack; + correct channel count for PNG & BMP + 2.10 (2016-01-22) avoid warning introduced in 2.09 + 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED + + See end of file for full revision history. + + + ============================ Contributors ========================= + + Image formats Extensions, features + Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info) + Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info) + Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) + Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) + Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) + Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) + Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) + github:urraka (animated gif) Junggon Kim (PNM comments) + Christopher Forseth (animated gif) Daniel Gibson (16-bit TGA) + socks-the-fox (16-bit PNG) + Jeremy Sawicki (handle all ImageNet JPGs) + Optimizations & bugfixes Mikhail Morozov (1-bit BMP) + Fabian "ryg" Giesen Anael Seghezzi (is-16-bit query) + Arseny Kapoulkine Simon Breuss (16-bit PNM) + John-Mark Allen + Carmelo J Fdez-Aguera + + Bug & warning fixes + Marc LeBlanc David Woo Guillaume George Martins Mozeiko + Christpher Lloyd Jerry Jansson Joseph Thomson Blazej Dariusz Roszkowski + Phil Jordan Dave Moore Roy Eltham + Hayaki Saito Nathan Reed Won Chun + Luke Graham Johan Duparc Nick Verigakis the Horde3D community + Thomas Ruf Ronny Chevalier github:rlyeh + Janez Zemva John Bartholomew Michal Cichon github:romigrou + Jonathan Blow Ken Hamada Tero Hanninen github:svdijk + Eugene Golushkov Laurent Gomila Cort Stratton github:snagar + Aruelien Pocheville Sergio Gonzalez Thibault Reuille github:Zelex + Cass Everitt Ryamond Barbiero github:grim210 + Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw + Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus + Josh Tobin Neil Bickford Matthew Gregan github:poppolopoppo + Julian Raschke Gregory Mullen Christian Floisand github:darealshinji + Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007 + Brad Weinberger Matvey Cherevko github:mosra + Luca Sas Alexander Veselov Zack Middleton [reserved] + Ryan C. Gordon [reserved] [reserved] + DO NOT ADD YOUR NAME HERE + + Jacko Dirks + + To add your name to the credits, pick a random blank space in the middle and fill it. + 80% of merge conflicts on stb PRs are due to people adding their name at the end + of the credits. +*/ + +#ifndef STBI_INCLUDE_STB_IMAGE_H +#define STBI_INCLUDE_STB_IMAGE_H + +// DOCUMENTATION +// +// Limitations: +// - no 12-bit-per-channel JPEG +// - no JPEGs with arithmetic coding +// - GIF always returns *comp=4 +// +// Basic usage (see HDR discussion below for HDR usage): +// int x,y,n; +// unsigned char *data = stbi_load(filename, &x, &y, &n, 0); +// // ... process data if not NULL ... +// // ... x = width, y = height, n = # 8-bit components per pixel ... +// // ... replace '0' with '1'..'4' to force that many components per pixel +// // ... but 'n' will always be the number that it would have been if you said 0 +// stbi_image_free(data); +// +// Standard parameters: +// int *x -- outputs image width in pixels +// int *y -- outputs image height in pixels +// int *channels_in_file -- outputs # of image components in image file +// int desired_channels -- if non-zero, # of image components requested in result +// +// The return value from an image loader is an 'unsigned char *' which points +// to the pixel data, or NULL on an allocation failure or if the image is +// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, +// with each pixel consisting of N interleaved 8-bit components; the first +// pixel pointed to is top-left-most in the image. There is no padding between +// image scanlines or between pixels, regardless of format. The number of +// components N is 'desired_channels' if desired_channels is non-zero, or +// *channels_in_file otherwise. If desired_channels is non-zero, +// *channels_in_file has the number of components that _would_ have been +// output otherwise. E.g. if you set desired_channels to 4, you will always +// get RGBA output, but you can check *channels_in_file to see if it's trivially +// opaque because e.g. there were only 3 channels in the source image. +// +// An output image with N components has the following components interleaved +// in this order in each pixel: +// +// N=#comp components +// 1 grey +// 2 grey, alpha +// 3 red, green, blue +// 4 red, green, blue, alpha +// +// If image loading fails for any reason, the return value will be NULL, +// and *x, *y, *channels_in_file will be unchanged. The function +// stbi_failure_reason() can be queried for an extremely brief, end-user +// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS +// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly +// more user-friendly ones. +// +// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. +// +// To query the width, height and component count of an image without having to +// decode the full file, you can use the stbi_info family of functions: +// +// int x,y,n,ok; +// ok = stbi_info(filename, &x, &y, &n); +// // returns ok=1 and sets x, y, n if image is a supported format, +// // 0 otherwise. +// +// Note that stb_image pervasively uses ints in its public API for sizes, +// including sizes of memory buffers. This is now part of the API and thus +// hard to change without causing breakage. As a result, the various image +// loaders all have certain limits on image size; these differ somewhat +// by format but generally boil down to either just under 2GB or just under +// 1GB. When the decoded image would be larger than this, stb_image decoding +// will fail. +// +// Additionally, stb_image will reject image files that have any of their +// dimensions set to a larger value than the configurable STBI_MAX_DIMENSIONS, +// which defaults to 2**24 = 16777216 pixels. Due to the above memory limit, +// the only way to have an image with such dimensions load correctly +// is for it to have a rather extreme aspect ratio. Either way, the +// assumption here is that such larger images are likely to be malformed +// or malicious. If you do need to load an image with individual dimensions +// larger than that, and it still fits in the overall size limit, you can +// #define STBI_MAX_DIMENSIONS on your own to be something larger. +// +// =========================================================================== +// +// UNICODE: +// +// If compiling for Windows and you wish to use Unicode filenames, compile +// with +// #define STBI_WINDOWS_UTF8 +// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert +// Windows wchar_t filenames to utf8. +// +// =========================================================================== +// +// Philosophy +// +// stb libraries are designed with the following priorities: +// +// 1. easy to use +// 2. easy to maintain +// 3. good performance +// +// Sometimes I let "good performance" creep up in priority over "easy to maintain", +// and for best performance I may provide less-easy-to-use APIs that give higher +// performance, in addition to the easy-to-use ones. Nevertheless, it's important +// to keep in mind that from the standpoint of you, a client of this library, +// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all. +// +// Some secondary priorities arise directly from the first two, some of which +// provide more explicit reasons why performance can't be emphasized. +// +// - Portable ("ease of use") +// - Small source code footprint ("easy to maintain") +// - No dependencies ("ease of use") +// +// =========================================================================== +// +// I/O callbacks +// +// I/O callbacks allow you to read from arbitrary sources, like packaged +// files or some other source. Data read from callbacks are processed +// through a small internal buffer (currently 128 bytes) to try to reduce +// overhead. +// +// The three functions you must define are "read" (reads some bytes of data), +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). +// +// =========================================================================== +// +// SIMD support +// +// The JPEG decoder will try to automatically use SIMD kernels on x86 when +// supported by the compiler. For ARM Neon support, you must explicitly +// request it. +// +// (The old do-it-yourself SIMD API is no longer supported in the current +// code.) +// +// On x86, SSE2 will automatically be used when available based on a run-time +// test; if not, the generic C versions are used as a fall-back. On ARM targets, +// the typical path is to have separate builds for NEON and non-NEON devices +// (at least this is true for iOS and Android). Therefore, the NEON support is +// toggled by a build flag: define STBI_NEON to get NEON loops. +// +// If for some reason you do not want to use any of SIMD code, or if +// you have issues compiling it, you can disable it entirely by +// defining STBI_NO_SIMD. +// +// =========================================================================== +// +// HDR image support (disable by defining STBI_NO_HDR) +// +// stb_image supports loading HDR images in general, and currently the Radiance +// .HDR file format specifically. You can still load any file through the existing +// interface; if you attempt to load an HDR file, it will be automatically remapped +// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; +// both of these constants can be reconfigured through this interface: +// +// stbi_hdr_to_ldr_gamma(2.2f); +// stbi_hdr_to_ldr_scale(1.0f); +// +// (note, do not use _inverse_ constants; stbi_image will invert them +// appropriately). +// +// Additionally, there is a new, parallel interface for loading files as +// (linear) floats to preserve the full dynamic range: +// +// float *data = stbi_loadf(filename, &x, &y, &n, 0); +// +// If you load LDR images through this interface, those images will +// be promoted to floating point values, run through the inverse of +// constants corresponding to the above: +// +// stbi_ldr_to_hdr_scale(1.0f); +// stbi_ldr_to_hdr_gamma(2.2f); +// +// Finally, given a filename (or an open file or memory block--see header +// file for details) containing image data, you can query for the "most +// appropriate" interface to use (that is, whether the image is HDR or +// not), using: +// +// stbi_is_hdr(char *filename); +// +// =========================================================================== +// +// iPhone PNG support: +// +// We optionally support converting iPhone-formatted PNGs (which store +// premultiplied BGRA) back to RGB, even though they're internally encoded +// differently. To enable this conversion, call +// stbi_convert_iphone_png_to_rgb(1). +// +// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per +// pixel to remove any premultiplied alpha *only* if the image file explicitly +// says there's premultiplied data (currently only happens in iPhone images, +// and only if iPhone convert-to-rgb processing is on). +// +// =========================================================================== +// +// ADDITIONAL CONFIGURATION +// +// - You can suppress implementation of any of the decoders to reduce +// your code footprint by #defining one or more of the following +// symbols before creating the implementation. +// +// STBI_NO_JPEG +// STBI_NO_PNG +// STBI_NO_BMP +// STBI_NO_PSD +// STBI_NO_TGA +// STBI_NO_GIF +// STBI_NO_HDR +// STBI_NO_PIC +// STBI_NO_PNM (.ppm and .pgm) +// +// - You can request *only* certain decoders and suppress all other ones +// (this will be more forward-compatible, as addition of new decoders +// doesn't require you to disable them explicitly): +// +// STBI_ONLY_JPEG +// STBI_ONLY_PNG +// STBI_ONLY_BMP +// STBI_ONLY_PSD +// STBI_ONLY_TGA +// STBI_ONLY_GIF +// STBI_ONLY_HDR +// STBI_ONLY_PIC +// STBI_ONLY_PNM (.ppm and .pgm) +// +// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still +// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB +// +// - If you define STBI_MAX_DIMENSIONS, stb_image will reject images greater +// than that size (in either width or height) without further processing. +// This is to let programs in the wild set an upper bound to prevent +// denial-of-service attacks on untrusted data, as one could generate a +// valid image of gigantic dimensions and force stb_image to allocate a +// huge block of memory and spend disproportionate time decoding it. By +// default this is set to (1 << 24), which is 16777216, but that's still +// very big. + +#ifndef STBI_NO_STDIO +#include <stdio.h> +#endif // STBI_NO_STDIO + +#define STBI_VERSION 1 + +enum +{ + STBI_default = 0, // only used for desired_channels + + STBI_grey = 1, + STBI_grey_alpha = 2, + STBI_rgb = 3, + STBI_rgb_alpha = 4 +}; + +#include <stdlib.h> +typedef unsigned char stbi_uc; +typedef unsigned short stbi_us; + +#ifdef __cplusplus +extern "C" { +#endif + +#ifndef STBIDEF +#ifdef STB_IMAGE_STATIC +#define STBIDEF static +#else +#define STBIDEF extern +#endif +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// PRIMARY API - works on images of any type +// + +// +// load image by filename, open file, or memory buffer +// + +typedef struct +{ + int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read + void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative + int (*eof) (void *user); // returns nonzero if we are at end of file/data +} stbi_io_callbacks; + +//////////////////////////////////// +// +// 8-bits-per-channel interface +// + +STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels); + +#ifndef STBI_NO_STDIO +STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); +// for stbi_load_from_file, file pointer is left pointing immediately after image +#endif + +#ifndef STBI_NO_GIF +STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp); +#endif + +#ifdef STBI_WINDOWS_UTF8 +STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input); +#endif + +//////////////////////////////////// +// +// 16-bits-per-channel interface +// + +STBIDEF stbi_us *stbi_load_16_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels); + +#ifndef STBI_NO_STDIO +STBIDEF stbi_us *stbi_load_16 (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); +STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); +#endif + +//////////////////////////////////// +// +// float-per-channel interface +// +#ifndef STBI_NO_LINEAR + STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels); + STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels); + + #ifndef STBI_NO_STDIO + STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); + STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); + #endif +#endif + +#ifndef STBI_NO_HDR + STBIDEF void stbi_hdr_to_ldr_gamma(float gamma); + STBIDEF void stbi_hdr_to_ldr_scale(float scale); +#endif // STBI_NO_HDR + +#ifndef STBI_NO_LINEAR + STBIDEF void stbi_ldr_to_hdr_gamma(float gamma); + STBIDEF void stbi_ldr_to_hdr_scale(float scale); +#endif // STBI_NO_LINEAR + +// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user); +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename); +STBIDEF int stbi_is_hdr_from_file(FILE *f); +#endif // STBI_NO_STDIO + + +// get a VERY brief reason for failure +// on most compilers (and ALL modern mainstream compilers) this is threadsafe +STBIDEF const char *stbi_failure_reason (void); + +// free the loaded image -- this is just free() +STBIDEF void stbi_image_free (void *retval_from_stbi_load); + +// get image dimensions & components without fully decoding +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len); +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user); + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); +STBIDEF int stbi_is_16_bit (char const *filename); +STBIDEF int stbi_is_16_bit_from_file(FILE *f); +#endif + + + +// for image formats that explicitly notate that they have premultiplied alpha, +// we just return the colors as stored in the file. set this flag to force +// unpremultiplication. results are undefined if the unpremultiply overflow. +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); + +// indicate whether we should process iphone images back to canonical format, +// or just pass them through "as-is" +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); + +// flip the image vertically, so the first pixel in the output array is the bottom left +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip); + +// as above, but only applies to images loaded on the thread that calls the function +// this function is only available if your compiler supports thread-local variables; +// calling it will fail to link if your compiler doesn't +STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply); +STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert); +STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip); + +// ZLIB client - used by PNG, available for other purposes + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header); +STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); + +STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); + + +#ifdef __cplusplus +} +#endif + +// +// +//// end header file ///////////////////////////////////////////////////// +#endif // STBI_INCLUDE_STB_IMAGE_H + +#ifdef STB_IMAGE_IMPLEMENTATION + +#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ + || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ + || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ + || defined(STBI_ONLY_ZLIB) + #ifndef STBI_ONLY_JPEG + #define STBI_NO_JPEG + #endif + #ifndef STBI_ONLY_PNG + #define STBI_NO_PNG + #endif + #ifndef STBI_ONLY_BMP + #define STBI_NO_BMP + #endif + #ifndef STBI_ONLY_PSD + #define STBI_NO_PSD + #endif + #ifndef STBI_ONLY_TGA + #define STBI_NO_TGA + #endif + #ifndef STBI_ONLY_GIF + #define STBI_NO_GIF + #endif + #ifndef STBI_ONLY_HDR + #define STBI_NO_HDR + #endif + #ifndef STBI_ONLY_PIC + #define STBI_NO_PIC + #endif + #ifndef STBI_ONLY_PNM + #define STBI_NO_PNM + #endif +#endif + +#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB) +#define STBI_NO_ZLIB +#endif + + +#include <stdarg.h> +#include <stddef.h> // ptrdiff_t on osx +#include <stdlib.h> +#include <string.h> +#include <limits.h> + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) +#include <math.h> // ldexp, pow +#endif + +#ifndef STBI_NO_STDIO +#include <stdio.h> +#endif + +#ifndef STBI_ASSERT +#include <assert.h> +#define STBI_ASSERT(x) assert(x) +#endif + +#ifdef __cplusplus +#define STBI_EXTERN extern "C" +#else +#define STBI_EXTERN extern +#endif + + +#ifndef _MSC_VER + #ifdef __cplusplus + #define stbi_inline inline + #else + #define stbi_inline + #endif +#else + #define stbi_inline __forceinline +#endif + +#ifndef STBI_NO_THREAD_LOCALS + #if defined(__cplusplus) && __cplusplus >= 201103L + #define STBI_THREAD_LOCAL thread_local + #elif defined(__GNUC__) && __GNUC__ < 5 + #define STBI_THREAD_LOCAL __thread + #elif defined(_MSC_VER) + #define STBI_THREAD_LOCAL __declspec(thread) + #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__) + #define STBI_THREAD_LOCAL _Thread_local + #endif + + #ifndef STBI_THREAD_LOCAL + #if defined(__GNUC__) + #define STBI_THREAD_LOCAL __thread + #endif + #endif +#endif + +#if defined(_MSC_VER) || defined(__SYMBIAN32__) +typedef unsigned short stbi__uint16; +typedef signed short stbi__int16; +typedef unsigned int stbi__uint32; +typedef signed int stbi__int32; +#else +#include <stdint.h> +typedef uint16_t stbi__uint16; +typedef int16_t stbi__int16; +typedef uint32_t stbi__uint32; +typedef int32_t stbi__int32; +#endif + +// should produce compiler error if size is wrong +typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1]; + +#ifdef _MSC_VER +#define STBI_NOTUSED(v) (void)(v) +#else +#define STBI_NOTUSED(v) (void)sizeof(v) +#endif + +#ifdef _MSC_VER +#define STBI_HAS_LROTL +#endif + +#ifdef STBI_HAS_LROTL + #define stbi_lrot(x,y) _lrotl(x,y) +#else + #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (-(y) & 31))) +#endif + +#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) +// ok +#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) +// ok +#else +#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." +#endif + +#ifndef STBI_MALLOC +#define STBI_MALLOC(sz) malloc(sz) +#define STBI_REALLOC(p,newsz) realloc(p,newsz) +#define STBI_FREE(p) free(p) +#endif + +#ifndef STBI_REALLOC_SIZED +#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) +#endif + +// x86/x64 detection +#if defined(__x86_64__) || defined(_M_X64) +#define STBI__X64_TARGET +#elif defined(__i386) || defined(_M_IX86) +#define STBI__X86_TARGET +#endif + +#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) +// gcc doesn't support sse2 intrinsics unless you compile with -msse2, +// which in turn means it gets to use SSE2 everywhere. This is unfortunate, +// but previous attempts to provide the SSE2 functions with runtime +// detection caused numerous issues. The way architecture extensions are +// exposed in GCC/Clang is, sadly, not really suited for one-file libs. +// New behavior: if compiled with -msse2, we use SSE2 without any +// detection; if not, we don't use it at all. +#define STBI_NO_SIMD +#endif + +#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) +// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET +// +// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the +// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. +// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not +// simultaneously enabling "-mstackrealign". +// +// See https://github.com/nothings/stb/issues/81 for more information. +// +// So default to no SSE2 on 32-bit MinGW. If you've read this far and added +// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. +#define STBI_NO_SIMD +#endif + +#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) +#define STBI_SSE2 +#include <emmintrin.h> + +#ifdef _MSC_VER + +#if _MSC_VER >= 1400 // not VC6 +#include <intrin.h> // __cpuid +static int stbi__cpuid3(void) +{ + int info[4]; + __cpuid(info,1); + return info[3]; +} +#else +static int stbi__cpuid3(void) +{ + int res; + __asm { + mov eax,1 + cpuid + mov res,edx + } + return res; +} +#endif + +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name + +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) +static int stbi__sse2_available(void) +{ + int info3 = stbi__cpuid3(); + return ((info3 >> 26) & 1) != 0; +} +#endif + +#else // assume GCC-style if not VC++ +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) + +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) +static int stbi__sse2_available(void) +{ + // If we're even attempting to compile this on GCC/Clang, that means + // -msse2 is on, which means the compiler is allowed to use SSE2 + // instructions at will, and so are we. + return 1; +} +#endif + +#endif +#endif + +// ARM NEON +#if defined(STBI_NO_SIMD) && defined(STBI_NEON) +#undef STBI_NEON +#endif + +#ifdef STBI_NEON +#include <arm_neon.h> +#ifdef _MSC_VER +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name +#else +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) +#endif +#endif + +#ifndef STBI_SIMD_ALIGN +#define STBI_SIMD_ALIGN(type, name) type name +#endif + +#ifndef STBI_MAX_DIMENSIONS +#define STBI_MAX_DIMENSIONS (1 << 24) +#endif + +/////////////////////////////////////////////// +// +// stbi__context struct and start_xxx functions + +// stbi__context structure is our basic context used by all images, so it +// contains all the IO context, plus some basic image information +typedef struct +{ + stbi__uint32 img_x, img_y; + int img_n, img_out_n; + + stbi_io_callbacks io; + void *io_user_data; + + int read_from_callbacks; + int buflen; + stbi_uc buffer_start[128]; + int callback_already_read; + + stbi_uc *img_buffer, *img_buffer_end; + stbi_uc *img_buffer_original, *img_buffer_original_end; +} stbi__context; + + +static void stbi__refill_buffer(stbi__context *s); + +// initialize a memory-decode context +static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len) +{ + s->io.read = NULL; + s->read_from_callbacks = 0; + s->callback_already_read = 0; + s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer; + s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len; +} + +// initialize a callback-based context +static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) +{ + s->io = *c; + s->io_user_data = user; + s->buflen = sizeof(s->buffer_start); + s->read_from_callbacks = 1; + s->callback_already_read = 0; + s->img_buffer = s->img_buffer_original = s->buffer_start; + stbi__refill_buffer(s); + s->img_buffer_original_end = s->img_buffer_end; +} + +#ifndef STBI_NO_STDIO + +static int stbi__stdio_read(void *user, char *data, int size) +{ + return (int) fread(data,1,size,(FILE*) user); +} + +static void stbi__stdio_skip(void *user, int n) +{ + int ch; + fseek((FILE*) user, n, SEEK_CUR); + ch = fgetc((FILE*) user); /* have to read a byte to reset feof()'s flag */ + if (ch != EOF) { + ungetc(ch, (FILE *) user); /* push byte back onto stream if valid. */ + } +} + +static int stbi__stdio_eof(void *user) +{ + return feof((FILE*) user) || ferror((FILE *) user); +} + +static stbi_io_callbacks stbi__stdio_callbacks = +{ + stbi__stdio_read, + stbi__stdio_skip, + stbi__stdio_eof, +}; + +static void stbi__start_file(stbi__context *s, FILE *f) +{ + stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f); +} + +//static void stop_file(stbi__context *s) { } + +#endif // !STBI_NO_STDIO + +static void stbi__rewind(stbi__context *s) +{ + // conceptually rewind SHOULD rewind to the beginning of the stream, + // but we just rewind to the beginning of the initial buffer, because + // we only use it after doing 'test', which only ever looks at at most 92 bytes + s->img_buffer = s->img_buffer_original; + s->img_buffer_end = s->img_buffer_original_end; +} + +enum +{ + STBI_ORDER_RGB, + STBI_ORDER_BGR +}; + +typedef struct +{ + int bits_per_channel; + int num_channels; + int channel_order; +} stbi__result_info; + +#ifndef STBI_NO_JPEG +static int stbi__jpeg_test(stbi__context *s); +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNG +static int stbi__png_test(stbi__context *s); +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__png_is16(stbi__context *s); +#endif + +#ifndef STBI_NO_BMP +static int stbi__bmp_test(stbi__context *s); +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_TGA +static int stbi__tga_test(stbi__context *s); +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s); +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc); +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__psd_is16(stbi__context *s); +#endif + +#ifndef STBI_NO_HDR +static int stbi__hdr_test(stbi__context *s); +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_test(stbi__context *s); +static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_GIF +static int stbi__gif_test(stbi__context *s); +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp); +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNM +static int stbi__pnm_test(stbi__context *s); +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__pnm_is16(stbi__context *s); +#endif + +static +#ifdef STBI_THREAD_LOCAL +STBI_THREAD_LOCAL +#endif +const char *stbi__g_failure_reason; + +STBIDEF const char *stbi_failure_reason(void) +{ + return stbi__g_failure_reason; +} + +#ifndef STBI_NO_FAILURE_STRINGS +static int stbi__err(const char *str) +{ + stbi__g_failure_reason = str; + return 0; +} +#endif + +static void *stbi__malloc(size_t size) +{ + return STBI_MALLOC(size); +} + +// stb_image uses ints pervasively, including for offset calculations. +// therefore the largest decoded image size we can support with the +// current code, even on 64-bit targets, is INT_MAX. this is not a +// significant limitation for the intended use case. +// +// we do, however, need to make sure our size calculations don't +// overflow. hence a few helper functions for size calculations that +// multiply integers together, making sure that they're non-negative +// and no overflow occurs. + +// return 1 if the sum is valid, 0 on overflow. +// negative terms are considered invalid. +static int stbi__addsizes_valid(int a, int b) +{ + if (b < 0) return 0; + // now 0 <= b <= INT_MAX, hence also + // 0 <= INT_MAX - b <= INTMAX. + // And "a + b <= INT_MAX" (which might overflow) is the + // same as a <= INT_MAX - b (no overflow) + return a <= INT_MAX - b; +} + +// returns 1 if the product is valid, 0 on overflow. +// negative factors are considered invalid. +static int stbi__mul2sizes_valid(int a, int b) +{ + if (a < 0 || b < 0) return 0; + if (b == 0) return 1; // mul-by-0 is always safe + // portable way to check for no overflows in a*b + return a <= INT_MAX/b; +} + +#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR) +// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow +static int stbi__mad2sizes_valid(int a, int b, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add); +} +#endif + +// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow +static int stbi__mad3sizes_valid(int a, int b, int c, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && + stbi__addsizes_valid(a*b*c, add); +} + +// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM) +static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) +{ + return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && + stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add); +} +#endif + +#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR) +// mallocs with size overflow checking +static void *stbi__malloc_mad2(int a, int b, int add) +{ + if (!stbi__mad2sizes_valid(a, b, add)) return NULL; + return stbi__malloc(a*b + add); +} +#endif + +static void *stbi__malloc_mad3(int a, int b, int c, int add) +{ + if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL; + return stbi__malloc(a*b*c + add); +} + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM) +static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) +{ + if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL; + return stbi__malloc(a*b*c*d + add); +} +#endif + +// returns 1 if the sum of two signed ints is valid (between -2^31 and 2^31-1 inclusive), 0 on overflow. +static int stbi__addints_valid(int a, int b) +{ + if ((a >= 0) != (b >= 0)) return 1; // a and b have different signs, so no overflow + if (a < 0 && b < 0) return a >= INT_MIN - b; // same as a + b >= INT_MIN; INT_MIN - b cannot overflow since b < 0. + return a <= INT_MAX - b; +} + +// returns 1 if the product of two ints fits in a signed short, 0 on overflow. +static int stbi__mul2shorts_valid(int a, int b) +{ + if (b == 0 || b == -1) return 1; // multiplication by 0 is always 0; check for -1 so SHRT_MIN/b doesn't overflow + if ((a >= 0) == (b >= 0)) return a <= SHRT_MAX/b; // product is positive, so similar to mul2sizes_valid + if (b < 0) return a <= SHRT_MIN / b; // same as a * b >= SHRT_MIN + return a >= SHRT_MIN / b; +} + +// stbi__err - error +// stbi__errpf - error returning pointer to float +// stbi__errpuc - error returning pointer to unsigned char + +#ifdef STBI_NO_FAILURE_STRINGS + #define stbi__err(x,y) 0 +#elif defined(STBI_FAILURE_USERMSG) + #define stbi__err(x,y) stbi__err(y) +#else + #define stbi__err(x,y) stbi__err(x) +#endif + +#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL)) +#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL)) + +STBIDEF void stbi_image_free(void *retval_from_stbi_load) +{ + STBI_FREE(retval_from_stbi_load); +} + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp); +#endif + +#ifndef STBI_NO_HDR +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp); +#endif + +static int stbi__vertically_flip_on_load_global = 0; + +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) +{ + stbi__vertically_flip_on_load_global = flag_true_if_should_flip; +} + +#ifndef STBI_THREAD_LOCAL +#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global +#else +static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set; + +STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip) +{ + stbi__vertically_flip_on_load_local = flag_true_if_should_flip; + stbi__vertically_flip_on_load_set = 1; +} + +#define stbi__vertically_flip_on_load (stbi__vertically_flip_on_load_set \ + ? stbi__vertically_flip_on_load_local \ + : stbi__vertically_flip_on_load_global) +#endif // STBI_THREAD_LOCAL + +static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ + memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields + ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed + ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order + ri->num_channels = 0; + + // test the formats with a very explicit header first (at least a FOURCC + // or distinctive magic number first) + #ifndef STBI_NO_PNG + if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_BMP + if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_GIF + if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PSD + if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc); + #else + STBI_NOTUSED(bpc); + #endif + #ifndef STBI_NO_PIC + if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri); + #endif + + // then the formats that can end up attempting to load with just 1 or 2 + // bytes matching expectations; these are prone to false positives, so + // try them later + #ifndef STBI_NO_JPEG + if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri); + #endif + #ifndef STBI_NO_PNM + if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri); + #endif + + #ifndef STBI_NO_HDR + if (stbi__hdr_test(s)) { + float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri); + return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); + } + #endif + + #ifndef STBI_NO_TGA + // test tga last because it's a crappy test! + if (stbi__tga_test(s)) + return stbi__tga_load(s,x,y,comp,req_comp, ri); + #endif + + return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); +} + +static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels) +{ + int i; + int img_len = w * h * channels; + stbi_uc *reduced; + + reduced = (stbi_uc *) stbi__malloc(img_len); + if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory"); + + for (i = 0; i < img_len; ++i) + reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling + + STBI_FREE(orig); + return reduced; +} + +static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels) +{ + int i; + int img_len = w * h * channels; + stbi__uint16 *enlarged; + + enlarged = (stbi__uint16 *) stbi__malloc(img_len*2); + if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + + for (i = 0; i < img_len; ++i) + enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff + + STBI_FREE(orig); + return enlarged; +} + +static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel) +{ + int row; + size_t bytes_per_row = (size_t)w * bytes_per_pixel; + stbi_uc temp[2048]; + stbi_uc *bytes = (stbi_uc *)image; + + for (row = 0; row < (h>>1); row++) { + stbi_uc *row0 = bytes + row*bytes_per_row; + stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row; + // swap row0 with row1 + size_t bytes_left = bytes_per_row; + while (bytes_left) { + size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp); + memcpy(temp, row0, bytes_copy); + memcpy(row0, row1, bytes_copy); + memcpy(row1, temp, bytes_copy); + row0 += bytes_copy; + row1 += bytes_copy; + bytes_left -= bytes_copy; + } + } +} + +#ifndef STBI_NO_GIF +static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel) +{ + int slice; + int slice_size = w * h * bytes_per_pixel; + + stbi_uc *bytes = (stbi_uc *)image; + for (slice = 0; slice < z; ++slice) { + stbi__vertical_flip(bytes, w, h, bytes_per_pixel); + bytes += slice_size; + } +} +#endif + +static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + stbi__result_info ri; + void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8); + + if (result == NULL) + return NULL; + + // it is the responsibility of the loaders to make sure we get either 8 or 16 bit. + STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16); + + if (ri.bits_per_channel != 8) { + result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp); + ri.bits_per_channel = 8; + } + + // @TODO: move stbi__convert_format to here + + if (stbi__vertically_flip_on_load) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc)); + } + + return (unsigned char *) result; +} + +static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + stbi__result_info ri; + void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16); + + if (result == NULL) + return NULL; + + // it is the responsibility of the loaders to make sure we get either 8 or 16 bit. + STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16); + + if (ri.bits_per_channel != 16) { + result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp); + ri.bits_per_channel = 16; + } + + // @TODO: move stbi__convert_format16 to here + // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision + + if (stbi__vertically_flip_on_load) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16)); + } + + return (stbi__uint16 *) result; +} + +#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR) +static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) +{ + if (stbi__vertically_flip_on_load && result != NULL) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip(result, *x, *y, channels * sizeof(float)); + } +} +#endif + +#ifndef STBI_NO_STDIO + +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); +STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default); +#endif + +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) +{ + return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); +} +#endif + +static FILE *stbi__fopen(char const *filename, char const *mode) +{ + FILE *f; +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) + wchar_t wMode[64]; + wchar_t wFilename[1024]; + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)/sizeof(*wFilename))) + return 0; + + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)/sizeof(*wMode))) + return 0; + +#if defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != _wfopen_s(&f, wFilename, wMode)) + f = 0; +#else + f = _wfopen(wFilename, wMode); +#endif + +#elif defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != fopen_s(&f, filename, mode)) + f=0; +#else + f = fopen(filename, mode); +#endif + return f; +} + + +STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + unsigned char *result; + if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); + result = stbi_load_from_file(f,x,y,comp,req_comp); + fclose(f); + return result; +} + +STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *result; + stbi__context s; + stbi__start_file(&s,f); + result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); + if (result) { + // need to 'unget' all the characters in the IO buffer + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); + } + return result; +} + +STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + stbi__uint16 *result; + stbi__context s; + stbi__start_file(&s,f); + result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp); + if (result) { + // need to 'unget' all the characters in the IO buffer + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); + } + return result; +} + +STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + stbi__uint16 *result; + if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file"); + result = stbi_load_from_file_16(f,x,y,comp,req_comp); + fclose(f); + return result; +} + + +#endif //!STBI_NO_STDIO + +STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); +} + +STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user); + return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); +} + +STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_GIF +STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp) +{ + unsigned char *result; + stbi__context s; + stbi__start_mem(&s,buffer,len); + + result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp); + if (stbi__vertically_flip_on_load) { + stbi__vertical_flip_slices( result, *x, *y, *z, *comp ); + } + + return result; +} +#endif + +#ifndef STBI_NO_LINEAR +static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *data; + #ifndef STBI_NO_HDR + if (stbi__hdr_test(s)) { + stbi__result_info ri; + float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri); + if (hdr_data) + stbi__float_postprocess(hdr_data,x,y,comp,req_comp); + return hdr_data; + } + #endif + data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp); + if (data) + return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); + return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); +} + +STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_STDIO +STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + float *result; + FILE *f = stbi__fopen(filename, "rb"); + if (!f) return stbi__errpf("can't fopen", "Unable to open file"); + result = stbi_loadf_from_file(f,x,y,comp,req_comp); + fclose(f); + return result; +} + +STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + stbi__context s; + stbi__start_file(&s,f); + return stbi__loadf_main(&s,x,y,comp,req_comp); +} +#endif // !STBI_NO_STDIO + +#endif // !STBI_NO_LINEAR + +// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is +// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always +// reports false! + +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(buffer); + STBI_NOTUSED(len); + return 0; + #endif +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result=0; + if (f) { + result = stbi_is_hdr_from_file(f); + fclose(f); + } + return result; +} + +STBIDEF int stbi_is_hdr_from_file(FILE *f) +{ + #ifndef STBI_NO_HDR + long pos = ftell(f); + int res; + stbi__context s; + stbi__start_file(&s,f); + res = stbi__hdr_test(&s); + fseek(f, pos, SEEK_SET); + return res; + #else + STBI_NOTUSED(f); + return 0; + #endif +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) +{ + #ifndef STBI_NO_HDR + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); + return stbi__hdr_test(&s); + #else + STBI_NOTUSED(clbk); + STBI_NOTUSED(user); + return 0; + #endif +} + +#ifndef STBI_NO_LINEAR +static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; + +STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } +STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } +#endif + +static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; + +STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } +STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } + + +////////////////////////////////////////////////////////////////////////////// +// +// Common code used by all image loaders +// + +enum +{ + STBI__SCAN_load=0, + STBI__SCAN_type, + STBI__SCAN_header +}; + +static void stbi__refill_buffer(stbi__context *s) +{ + int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); + s->callback_already_read += (int) (s->img_buffer - s->img_buffer_original); + if (n == 0) { + // at end of file, treat same as if from memory, but need to handle case + // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file + s->read_from_callbacks = 0; + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start+1; + *s->img_buffer = 0; + } else { + s->img_buffer = s->buffer_start; + s->img_buffer_end = s->buffer_start + n; + } +} + +stbi_inline static stbi_uc stbi__get8(stbi__context *s) +{ + if (s->img_buffer < s->img_buffer_end) + return *s->img_buffer++; + if (s->read_from_callbacks) { + stbi__refill_buffer(s); + return *s->img_buffer++; + } + return 0; +} + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +stbi_inline static int stbi__at_eof(stbi__context *s) +{ + if (s->io.read) { + if (!(s->io.eof)(s->io_user_data)) return 0; + // if feof() is true, check if buffer = end + // special case: we've only got the special 0 character at the end + if (s->read_from_callbacks == 0) return 1; + } + + return s->img_buffer >= s->img_buffer_end; +} +#endif + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) +// nothing +#else +static void stbi__skip(stbi__context *s, int n) +{ + if (n == 0) return; // already there! + if (n < 0) { + s->img_buffer = s->img_buffer_end; + return; + } + if (s->io.read) { + int blen = (int) (s->img_buffer_end - s->img_buffer); + if (blen < n) { + s->img_buffer = s->img_buffer_end; + (s->io.skip)(s->io_user_data, n - blen); + return; + } + } + s->img_buffer += n; +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM) +// nothing +#else +static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n) +{ + if (s->io.read) { + int blen = (int) (s->img_buffer_end - s->img_buffer); + if (blen < n) { + int res, count; + + memcpy(buffer, s->img_buffer, blen); + + count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); + res = (count == (n-blen)); + s->img_buffer = s->img_buffer_end; + return res; + } + } + + if (s->img_buffer+n <= s->img_buffer_end) { + memcpy(buffer, s->img_buffer, n); + s->img_buffer += n; + return 1; + } else + return 0; +} +#endif + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC) +// nothing +#else +static int stbi__get16be(stbi__context *s) +{ + int z = stbi__get8(s); + return (z << 8) + stbi__get8(s); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC) +// nothing +#else +static stbi__uint32 stbi__get32be(stbi__context *s) +{ + stbi__uint32 z = stbi__get16be(s); + return (z << 16) + stbi__get16be(s); +} +#endif + +#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) +// nothing +#else +static int stbi__get16le(stbi__context *s) +{ + int z = stbi__get8(s); + return z + (stbi__get8(s) << 8); +} +#endif + +#ifndef STBI_NO_BMP +static stbi__uint32 stbi__get32le(stbi__context *s) +{ + stbi__uint32 z = stbi__get16le(s); + z += (stbi__uint32)stbi__get16le(s) << 16; + return z; +} +#endif + +#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +////////////////////////////////////////////////////////////////////////////// +// +// generic converter from built-in img_n to req_comp +// individual types do this automatically as much as possible (e.g. jpeg +// does all cases internally since it needs to colorspace convert anyway, +// and it never has alpha, so very few cases ). png can automatically +// interleave an alpha=255 channel, but falls back to this for other cases +// +// assume data buffer is malloced, so malloc a new one and free that one +// only failure mode is malloc failing + +static stbi_uc stbi__compute_y(int r, int g, int b) +{ + return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ + int i,j; + unsigned char *good; + + if (req_comp == img_n) return data; + STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + + good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0); + if (good == NULL) { + STBI_FREE(data); + return stbi__errpuc("outofmem", "Out of memory"); + } + + for (j=0; j < (int) y; ++j) { + unsigned char *src = data + j * x * img_n ; + unsigned char *dest = good + j * x * req_comp; + + #define STBI__COMBO(a,b) ((a)*8+(b)) + #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) + // convert source image with img_n components to one with req_comp components; + // avoid switch per pixel, so use switch per scanline and massive macros + switch (STBI__COMBO(img_n, req_comp)) { + STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=255; } break; + STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=255; } break; + STBI__CASE(2,1) { dest[0]=src[0]; } break; + STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break; + STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=255; } break; + STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; + STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = 255; } break; + STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; + STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = src[3]; } break; + STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break; + default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return stbi__errpuc("unsupported", "Unsupported format conversion"); + } + #undef STBI__CASE + } + + STBI_FREE(data); + return good; +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) +// nothing +#else +static stbi__uint16 stbi__compute_y_16(int r, int g, int b) +{ + return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) +// nothing +#else +static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ + int i,j; + stbi__uint16 *good; + + if (req_comp == img_n) return data; + STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + + good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2); + if (good == NULL) { + STBI_FREE(data); + return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + } + + for (j=0; j < (int) y; ++j) { + stbi__uint16 *src = data + j * x * img_n ; + stbi__uint16 *dest = good + j * x * req_comp; + + #define STBI__COMBO(a,b) ((a)*8+(b)) + #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) + // convert source image with img_n components to one with req_comp components; + // avoid switch per pixel, so use switch per scanline and massive macros + switch (STBI__COMBO(img_n, req_comp)) { + STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=0xffff; } break; + STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=0xffff; } break; + STBI__CASE(2,1) { dest[0]=src[0]; } break; + STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; + STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break; + STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=0xffff; } break; + STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; + STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = 0xffff; } break; + STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; + STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = src[3]; } break; + STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break; + default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return (stbi__uint16*) stbi__errpuc("unsupported", "Unsupported format conversion"); + } + #undef STBI__CASE + } + + STBI_FREE(data); + return good; +} +#endif + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp) +{ + int i,k,n; + float *output; + if (!data) return NULL; + output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0); + if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); } + // compute number of non-alpha components + if (comp & 1) n = comp; else n = comp-1; + for (i=0; i < x*y; ++i) { + for (k=0; k < n; ++k) { + output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale); + } + } + if (n < comp) { + for (i=0; i < x*y; ++i) { + output[i*comp + n] = data[i*comp + n]/255.0f; + } + } + STBI_FREE(data); + return output; +} +#endif + +#ifndef STBI_NO_HDR +#define stbi__float2int(x) ((int) (x)) +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp) +{ + int i,k,n; + stbi_uc *output; + if (!data) return NULL; + output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0); + if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); } + // compute number of non-alpha components + if (comp & 1) n = comp; else n = comp-1; + for (i=0; i < x*y; ++i) { + for (k=0; k < n; ++k) { + float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f; + if (z < 0) z = 0; + if (z > 255) z = 255; + output[i*comp + k] = (stbi_uc) stbi__float2int(z); + } + if (k < comp) { + float z = data[i*comp+k] * 255 + 0.5f; + if (z < 0) z = 0; + if (z > 255) z = 255; + output[i*comp + k] = (stbi_uc) stbi__float2int(z); + } + } + STBI_FREE(data); + return output; +} +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// "baseline" JPEG/JFIF decoder +// +// simple implementation +// - doesn't support delayed output of y-dimension +// - simple interface (only one output format: 8-bit interleaved RGB) +// - doesn't try to recover corrupt jpegs +// - doesn't allow partial loading, loading multiple at once +// - still fast on x86 (copying globals into locals doesn't help x86) +// - allocates lots of intermediate memory (full size of all components) +// - non-interleaved case requires this anyway +// - allows good upsampling (see next) +// high-quality +// - upsampled channels are bilinearly interpolated, even across blocks +// - quality integer IDCT derived from IJG's 'slow' +// performance +// - fast huffman; reasonable integer IDCT +// - some SIMD kernels for common paths on targets with SSE2/NEON +// - uses a lot of intermediate memory, could cache poorly + +#ifndef STBI_NO_JPEG + +// huffman decoding acceleration +#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache + +typedef struct +{ + stbi_uc fast[1 << FAST_BITS]; + // weirdly, repacking this into AoS is a 10% speed loss, instead of a win + stbi__uint16 code[256]; + stbi_uc values[256]; + stbi_uc size[257]; + unsigned int maxcode[18]; + int delta[17]; // old 'firstsymbol' - old 'firstcode' +} stbi__huffman; + +typedef struct +{ + stbi__context *s; + stbi__huffman huff_dc[4]; + stbi__huffman huff_ac[4]; + stbi__uint16 dequant[4][64]; + stbi__int16 fast_ac[4][1 << FAST_BITS]; + +// sizes for components, interleaved MCUs + int img_h_max, img_v_max; + int img_mcu_x, img_mcu_y; + int img_mcu_w, img_mcu_h; + +// definition of jpeg image component + struct + { + int id; + int h,v; + int tq; + int hd,ha; + int dc_pred; + + int x,y,w2,h2; + stbi_uc *data; + void *raw_data, *raw_coeff; + stbi_uc *linebuf; + short *coeff; // progressive only + int coeff_w, coeff_h; // number of 8x8 coefficient blocks + } img_comp[4]; + + stbi__uint32 code_buffer; // jpeg entropy-coded buffer + int code_bits; // number of valid bits + unsigned char marker; // marker seen while filling entropy buffer + int nomore; // flag if we saw a marker so must stop + + int progressive; + int spec_start; + int spec_end; + int succ_high; + int succ_low; + int eob_run; + int jfif; + int app14_color_transform; // Adobe APP14 tag + int rgb; + + int scan_n, order[4]; + int restart_interval, todo; + +// kernels + void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]); + void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step); + stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs); +} stbi__jpeg; + +static int stbi__build_huffman(stbi__huffman *h, int *count) +{ + int i,j,k=0; + unsigned int code; + // build size list for each symbol (from JPEG spec) + for (i=0; i < 16; ++i) { + for (j=0; j < count[i]; ++j) { + h->size[k++] = (stbi_uc) (i+1); + if(k >= 257) return stbi__err("bad size list","Corrupt JPEG"); + } + } + h->size[k] = 0; + + // compute actual symbols (from jpeg spec) + code = 0; + k = 0; + for(j=1; j <= 16; ++j) { + // compute delta to add to code to compute symbol id + h->delta[j] = k - code; + if (h->size[k] == j) { + while (h->size[k] == j) + h->code[k++] = (stbi__uint16) (code++); + if (code-1 >= (1u << j)) return stbi__err("bad code lengths","Corrupt JPEG"); + } + // compute largest code + 1 for this size, preshifted as needed later + h->maxcode[j] = code << (16-j); + code <<= 1; + } + h->maxcode[j] = 0xffffffff; + + // build non-spec acceleration table; 255 is flag for not-accelerated + memset(h->fast, 255, 1 << FAST_BITS); + for (i=0; i < k; ++i) { + int s = h->size[i]; + if (s <= FAST_BITS) { + int c = h->code[i] << (FAST_BITS-s); + int m = 1 << (FAST_BITS-s); + for (j=0; j < m; ++j) { + h->fast[c+j] = (stbi_uc) i; + } + } + } + return 1; +} + +// build a table that decodes both magnitude and value of small ACs in +// one go. +static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h) +{ + int i; + for (i=0; i < (1 << FAST_BITS); ++i) { + stbi_uc fast = h->fast[i]; + fast_ac[i] = 0; + if (fast < 255) { + int rs = h->values[fast]; + int run = (rs >> 4) & 15; + int magbits = rs & 15; + int len = h->size[fast]; + + if (magbits && len + magbits <= FAST_BITS) { + // magnitude code followed by receive_extend code + int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); + int m = 1 << (magbits - 1); + if (k < m) k += (~0U << magbits) + 1; + // if the result is small enough, we can fit it in fast_ac table + if (k >= -128 && k <= 127) + fast_ac[i] = (stbi__int16) ((k * 256) + (run * 16) + (len + magbits)); + } + } + } +} + +static void stbi__grow_buffer_unsafe(stbi__jpeg *j) +{ + do { + unsigned int b = j->nomore ? 0 : stbi__get8(j->s); + if (b == 0xff) { + int c = stbi__get8(j->s); + while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes + if (c != 0) { + j->marker = (unsigned char) c; + j->nomore = 1; + return; + } + } + j->code_buffer |= b << (24 - j->code_bits); + j->code_bits += 8; + } while (j->code_bits <= 24); +} + +// (1 << n) - 1 +static const stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; + +// decode a jpeg huffman value from the bitstream +stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h) +{ + unsigned int temp; + int c,k; + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + + // look at the top FAST_BITS and determine what symbol ID it is, + // if the code is <= FAST_BITS + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + k = h->fast[c]; + if (k < 255) { + int s = h->size[k]; + if (s > j->code_bits) + return -1; + j->code_buffer <<= s; + j->code_bits -= s; + return h->values[k]; + } + + // naive test is to shift the code_buffer down so k bits are + // valid, then test against maxcode. To speed this up, we've + // preshifted maxcode left so that it has (16-k) 0s at the + // end; in other words, regardless of the number of bits, it + // wants to be compared against something shifted to have 16; + // that way we don't need to shift inside the loop. + temp = j->code_buffer >> 16; + for (k=FAST_BITS+1 ; ; ++k) + if (temp < h->maxcode[k]) + break; + if (k == 17) { + // error! code not found + j->code_bits -= 16; + return -1; + } + + if (k > j->code_bits) + return -1; + + // convert the huffman code to the symbol id + c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k]; + if(c < 0 || c >= 256) // symbol id out of bounds! + return -1; + STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]); + + // convert the id to a symbol + j->code_bits -= k; + j->code_buffer <<= k; + return h->values[c]; +} + +// bias[n] = (-1<<n) + 1 +static const int stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767}; + +// combined JPEG 'receive' and JPEG 'extend', since baseline +// always extends everything it receives. +stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n) +{ + unsigned int k; + int sgn; + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); + if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing + + sgn = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative) + k = stbi_lrot(j->code_buffer, n); + j->code_buffer = k & ~stbi__bmask[n]; + k &= stbi__bmask[n]; + j->code_bits -= n; + return k + (stbi__jbias[n] & (sgn - 1)); +} + +// get some unsigned bits +stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) +{ + unsigned int k; + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); + if (j->code_bits < n) return 0; // ran out of bits from stream, return 0s intead of continuing + k = stbi_lrot(j->code_buffer, n); + j->code_buffer = k & ~stbi__bmask[n]; + k &= stbi__bmask[n]; + j->code_bits -= n; + return k; +} + +stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) +{ + unsigned int k; + if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); + if (j->code_bits < 1) return 0; // ran out of bits from stream, return 0s intead of continuing + k = j->code_buffer; + j->code_buffer <<= 1; + --j->code_bits; + return k & 0x80000000; +} + +// given a value that's at position X in the zigzag stream, +// where does it appear in the 8x8 matrix coded as row-major? +static const stbi_uc stbi__jpeg_dezigzag[64+15] = +{ + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63, + // let corrupt input sample past end + 63, 63, 63, 63, 63, 63, 63, 63, + 63, 63, 63, 63, 63, 63, 63 +}; + +// decode one 64-entry block-- +static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant) +{ + int diff,dc,k; + int t; + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + t = stbi__jpeg_huff_decode(j, hdc); + if (t < 0 || t > 15) return stbi__err("bad huffman code","Corrupt JPEG"); + + // 0 all the ac values now so we can do it 32-bits at a time + memset(data,0,64*sizeof(data[0])); + + diff = t ? stbi__extend_receive(j, t) : 0; + if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta","Corrupt JPEG"); + dc = j->img_comp[b].dc_pred + diff; + j->img_comp[b].dc_pred = dc; + if (!stbi__mul2shorts_valid(dc, dequant[0])) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + data[0] = (short) (dc * dequant[0]); + + // decode AC components, see JPEG spec + k = 1; + do { + unsigned int zig; + int c,r,s; + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + r = fac[c]; + if (r) { // fast-AC path + k += (r >> 4) & 15; // run + s = r & 15; // combined length + if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available"); + j->code_buffer <<= s; + j->code_bits -= s; + // decode into unzigzag'd location + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) ((r >> 8) * dequant[zig]); + } else { + int rs = stbi__jpeg_huff_decode(j, hac); + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (rs != 0xf0) break; // end block + k += 16; + } else { + k += r; + // decode into unzigzag'd location + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]); + } + } + } while (k < 64); + return 1; +} + +static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b) +{ + int diff,dc; + int t; + if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + + if (j->succ_high == 0) { + // first scan for DC coefficient, must be first + memset(data,0,64*sizeof(data[0])); // 0 all the ac values now + t = stbi__jpeg_huff_decode(j, hdc); + if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + diff = t ? stbi__extend_receive(j, t) : 0; + + if (!stbi__addints_valid(j->img_comp[b].dc_pred, diff)) return stbi__err("bad delta", "Corrupt JPEG"); + dc = j->img_comp[b].dc_pred + diff; + j->img_comp[b].dc_pred = dc; + if (!stbi__mul2shorts_valid(dc, 1 << j->succ_low)) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + data[0] = (short) (dc * (1 << j->succ_low)); + } else { + // refinement scan for DC coefficient + if (stbi__jpeg_get_bit(j)) + data[0] += (short) (1 << j->succ_low); + } + return 1; +} + +// @OPTIMIZE: store non-zigzagged during the decode passes, +// and only de-zigzag when dequantizing +static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac) +{ + int k; + if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + + if (j->succ_high == 0) { + int shift = j->succ_low; + + if (j->eob_run) { + --j->eob_run; + return 1; + } + + k = j->spec_start; + do { + unsigned int zig; + int c,r,s; + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); + r = fac[c]; + if (r) { // fast-AC path + k += (r >> 4) & 15; // run + s = r & 15; // combined length + if (s > j->code_bits) return stbi__err("bad huffman code", "Combined length longer than code bits available"); + j->code_buffer <<= s; + j->code_bits -= s; + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) ((r >> 8) * (1 << shift)); + } else { + int rs = stbi__jpeg_huff_decode(j, hac); + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (r < 15) { + j->eob_run = (1 << r); + if (r) + j->eob_run += stbi__jpeg_get_bits(j, r); + --j->eob_run; + break; + } + k += 16; + } else { + k += r; + zig = stbi__jpeg_dezigzag[k++]; + data[zig] = (short) (stbi__extend_receive(j,s) * (1 << shift)); + } + } + } while (k <= j->spec_end); + } else { + // refinement scan for these AC coefficients + + short bit = (short) (1 << j->succ_low); + + if (j->eob_run) { + --j->eob_run; + for (k = j->spec_start; k <= j->spec_end; ++k) { + short *p = &data[stbi__jpeg_dezigzag[k]]; + if (*p != 0) + if (stbi__jpeg_get_bit(j)) + if ((*p & bit)==0) { + if (*p > 0) + *p += bit; + else + *p -= bit; + } + } + } else { + k = j->spec_start; + do { + int r,s; + int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); + s = rs & 15; + r = rs >> 4; + if (s == 0) { + if (r < 15) { + j->eob_run = (1 << r) - 1; + if (r) + j->eob_run += stbi__jpeg_get_bits(j, r); + r = 64; // force end of block + } else { + // r=15 s=0 should write 16 0s, so we just do + // a run of 15 0s and then write s (which is 0), + // so we don't have to do anything special here + } + } else { + if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); + // sign bit + if (stbi__jpeg_get_bit(j)) + s = bit; + else + s = -bit; + } + + // advance by r + while (k <= j->spec_end) { + short *p = &data[stbi__jpeg_dezigzag[k++]]; + if (*p != 0) { + if (stbi__jpeg_get_bit(j)) + if ((*p & bit)==0) { + if (*p > 0) + *p += bit; + else + *p -= bit; + } + } else { + if (r == 0) { + *p = (short) s; + break; + } + --r; + } + } + } while (k <= j->spec_end); + } + } + return 1; +} + +// take a -128..127 value and stbi__clamp it and convert to 0..255 +stbi_inline static stbi_uc stbi__clamp(int x) +{ + // trick to use a single test to catch both cases + if ((unsigned int) x > 255) { + if (x < 0) return 0; + if (x > 255) return 255; + } + return (stbi_uc) x; +} + +#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) +#define stbi__fsh(x) ((x) * 4096) + +// derived from jidctint -- DCT_ISLOW +#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ + int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ + p2 = s2; \ + p3 = s6; \ + p1 = (p2+p3) * stbi__f2f(0.5411961f); \ + t2 = p1 + p3*stbi__f2f(-1.847759065f); \ + t3 = p1 + p2*stbi__f2f( 0.765366865f); \ + p2 = s0; \ + p3 = s4; \ + t0 = stbi__fsh(p2+p3); \ + t1 = stbi__fsh(p2-p3); \ + x0 = t0+t3; \ + x3 = t0-t3; \ + x1 = t1+t2; \ + x2 = t1-t2; \ + t0 = s7; \ + t1 = s5; \ + t2 = s3; \ + t3 = s1; \ + p3 = t0+t2; \ + p4 = t1+t3; \ + p1 = t0+t3; \ + p2 = t1+t2; \ + p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ + t0 = t0*stbi__f2f( 0.298631336f); \ + t1 = t1*stbi__f2f( 2.053119869f); \ + t2 = t2*stbi__f2f( 3.072711026f); \ + t3 = t3*stbi__f2f( 1.501321110f); \ + p1 = p5 + p1*stbi__f2f(-0.899976223f); \ + p2 = p5 + p2*stbi__f2f(-2.562915447f); \ + p3 = p3*stbi__f2f(-1.961570560f); \ + p4 = p4*stbi__f2f(-0.390180644f); \ + t3 += p1+p4; \ + t2 += p2+p3; \ + t1 += p2+p4; \ + t0 += p1+p3; + +static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) +{ + int i,val[64],*v=val; + stbi_uc *o; + short *d = data; + + // columns + for (i=0; i < 8; ++i,++d, ++v) { + // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing + if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 + && d[40]==0 && d[48]==0 && d[56]==0) { + // no shortcut 0 seconds + // (1|2|3|4|5|6|7)==0 0 seconds + // all separate -0.047 seconds + // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds + int dcterm = d[0]*4; + v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; + } else { + STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) + // constants scaled things up by 1<<12; let's bring them back + // down, but keep 2 extra bits of precision + x0 += 512; x1 += 512; x2 += 512; x3 += 512; + v[ 0] = (x0+t3) >> 10; + v[56] = (x0-t3) >> 10; + v[ 8] = (x1+t2) >> 10; + v[48] = (x1-t2) >> 10; + v[16] = (x2+t1) >> 10; + v[40] = (x2-t1) >> 10; + v[24] = (x3+t0) >> 10; + v[32] = (x3-t0) >> 10; + } + } + + for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { + // no fast case since the first 1D IDCT spread components out + STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) + // constants scaled things up by 1<<12, plus we had 1<<2 from first + // loop, plus horizontal and vertical each scale by sqrt(8) so together + // we've got an extra 1<<3, so 1<<17 total we need to remove. + // so we want to round that, which means adding 0.5 * 1<<17, + // aka 65536. Also, we'll end up with -128 to 127 that we want + // to encode as 0..255 by adding 128, so we'll add that before the shift + x0 += 65536 + (128<<17); + x1 += 65536 + (128<<17); + x2 += 65536 + (128<<17); + x3 += 65536 + (128<<17); + // tried computing the shifts into temps, or'ing the temps to see + // if any were out of range, but that was slower + o[0] = stbi__clamp((x0+t3) >> 17); + o[7] = stbi__clamp((x0-t3) >> 17); + o[1] = stbi__clamp((x1+t2) >> 17); + o[6] = stbi__clamp((x1-t2) >> 17); + o[2] = stbi__clamp((x2+t1) >> 17); + o[5] = stbi__clamp((x2-t1) >> 17); + o[3] = stbi__clamp((x3+t0) >> 17); + o[4] = stbi__clamp((x3-t0) >> 17); + } +} + +#ifdef STBI_SSE2 +// sse2 integer IDCT. not the fastest possible implementation but it +// produces bit-identical results to the generic C version so it's +// fully "transparent". +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ + // This is constructed to match our regular (generic) integer IDCT exactly. + __m128i row0, row1, row2, row3, row4, row5, row6, row7; + __m128i tmp; + + // dot product constant: even elems=x, odd elems=y + #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) + + // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) + // out(1) = c1[even]*x + c1[odd]*y + #define dct_rot(out0,out1, x,y,c0,c1) \ + __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ + __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ + __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ + __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ + __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ + __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) + + // out = in << 12 (in 16-bit, out 32-bit) + #define dct_widen(out, in) \ + __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ + __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) + + // wide add + #define dct_wadd(out, a, b) \ + __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_add_epi32(a##_h, b##_h) + + // wide sub + #define dct_wsub(out, a, b) \ + __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) + + // butterfly a/b, add bias, then shift by "s" and pack + #define dct_bfly32o(out0, out1, a,b,bias,s) \ + { \ + __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ + __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ + dct_wadd(sum, abiased, b); \ + dct_wsub(dif, abiased, b); \ + out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ + out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ + } + + // 8-bit interleave step (for transposes) + #define dct_interleave8(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi8(a, b); \ + b = _mm_unpackhi_epi8(tmp, b) + + // 16-bit interleave step (for transposes) + #define dct_interleave16(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi16(a, b); \ + b = _mm_unpackhi_epi16(tmp, b) + + #define dct_pass(bias,shift) \ + { \ + /* even part */ \ + dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ + __m128i sum04 = _mm_add_epi16(row0, row4); \ + __m128i dif04 = _mm_sub_epi16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ + dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ + __m128i sum17 = _mm_add_epi16(row1, row7); \ + __m128i sum35 = _mm_add_epi16(row3, row5); \ + dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ + dct_wadd(x4, y0o, y4o); \ + dct_wadd(x5, y1o, y5o); \ + dct_wadd(x6, y2o, y5o); \ + dct_wadd(x7, y3o, y4o); \ + dct_bfly32o(row0,row7, x0,x7,bias,shift); \ + dct_bfly32o(row1,row6, x1,x6,bias,shift); \ + dct_bfly32o(row2,row5, x2,x5,bias,shift); \ + dct_bfly32o(row3,row4, x3,x4,bias,shift); \ + } + + __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); + __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); + __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); + __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); + __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); + __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); + __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); + __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); + + // rounding biases in column/row passes, see stbi__idct_block for explanation. + __m128i bias_0 = _mm_set1_epi32(512); + __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); + + // load + row0 = _mm_load_si128((const __m128i *) (data + 0*8)); + row1 = _mm_load_si128((const __m128i *) (data + 1*8)); + row2 = _mm_load_si128((const __m128i *) (data + 2*8)); + row3 = _mm_load_si128((const __m128i *) (data + 3*8)); + row4 = _mm_load_si128((const __m128i *) (data + 4*8)); + row5 = _mm_load_si128((const __m128i *) (data + 5*8)); + row6 = _mm_load_si128((const __m128i *) (data + 6*8)); + row7 = _mm_load_si128((const __m128i *) (data + 7*8)); + + // column pass + dct_pass(bias_0, 10); + + { + // 16bit 8x8 transpose pass 1 + dct_interleave16(row0, row4); + dct_interleave16(row1, row5); + dct_interleave16(row2, row6); + dct_interleave16(row3, row7); + + // transpose pass 2 + dct_interleave16(row0, row2); + dct_interleave16(row1, row3); + dct_interleave16(row4, row6); + dct_interleave16(row5, row7); + + // transpose pass 3 + dct_interleave16(row0, row1); + dct_interleave16(row2, row3); + dct_interleave16(row4, row5); + dct_interleave16(row6, row7); + } + + // row pass + dct_pass(bias_1, 17); + + { + // pack + __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 + __m128i p1 = _mm_packus_epi16(row2, row3); + __m128i p2 = _mm_packus_epi16(row4, row5); + __m128i p3 = _mm_packus_epi16(row6, row7); + + // 8bit 8x8 transpose pass 1 + dct_interleave8(p0, p2); // a0e0a1e1... + dct_interleave8(p1, p3); // c0g0c1g1... + + // transpose pass 2 + dct_interleave8(p0, p1); // a0c0e0g0... + dct_interleave8(p2, p3); // b0d0f0h0... + + // transpose pass 3 + dct_interleave8(p0, p2); // a0b0c0d0... + dct_interleave8(p1, p3); // a4b4c4d4... + + // store + _mm_storel_epi64((__m128i *) out, p0); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p2); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p1); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; + _mm_storel_epi64((__m128i *) out, p3); out += out_stride; + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); + } + +#undef dct_const +#undef dct_rot +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_interleave8 +#undef dct_interleave16 +#undef dct_pass +} + +#endif // STBI_SSE2 + +#ifdef STBI_NEON + +// NEON integer IDCT. should produce bit-identical +// results to the generic C version. +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ + int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; + + int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); + int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); + int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); + int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); + int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); + int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); + int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); + int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); + int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); + int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); + int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); + int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); + +#define dct_long_mul(out, inq, coeff) \ + int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) + +#define dct_long_mac(out, acc, inq, coeff) \ + int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) + +#define dct_widen(out, inq) \ + int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ + int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) + +// wide add +#define dct_wadd(out, a, b) \ + int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vaddq_s32(a##_h, b##_h) + +// wide sub +#define dct_wsub(out, a, b) \ + int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vsubq_s32(a##_h, b##_h) + +// butterfly a/b, then shift using "shiftop" by "s" and pack +#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ + { \ + dct_wadd(sum, a, b); \ + dct_wsub(dif, a, b); \ + out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ + out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ + } + +#define dct_pass(shiftop, shift) \ + { \ + /* even part */ \ + int16x8_t sum26 = vaddq_s16(row2, row6); \ + dct_long_mul(p1e, sum26, rot0_0); \ + dct_long_mac(t2e, p1e, row6, rot0_1); \ + dct_long_mac(t3e, p1e, row2, rot0_2); \ + int16x8_t sum04 = vaddq_s16(row0, row4); \ + int16x8_t dif04 = vsubq_s16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + int16x8_t sum15 = vaddq_s16(row1, row5); \ + int16x8_t sum17 = vaddq_s16(row1, row7); \ + int16x8_t sum35 = vaddq_s16(row3, row5); \ + int16x8_t sum37 = vaddq_s16(row3, row7); \ + int16x8_t sumodd = vaddq_s16(sum17, sum35); \ + dct_long_mul(p5o, sumodd, rot1_0); \ + dct_long_mac(p1o, p5o, sum17, rot1_1); \ + dct_long_mac(p2o, p5o, sum35, rot1_2); \ + dct_long_mul(p3o, sum37, rot2_0); \ + dct_long_mul(p4o, sum15, rot2_1); \ + dct_wadd(sump13o, p1o, p3o); \ + dct_wadd(sump24o, p2o, p4o); \ + dct_wadd(sump23o, p2o, p3o); \ + dct_wadd(sump14o, p1o, p4o); \ + dct_long_mac(x4, sump13o, row7, rot3_0); \ + dct_long_mac(x5, sump24o, row5, rot3_1); \ + dct_long_mac(x6, sump23o, row3, rot3_2); \ + dct_long_mac(x7, sump14o, row1, rot3_3); \ + dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ + dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ + dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ + dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ + } + + // load + row0 = vld1q_s16(data + 0*8); + row1 = vld1q_s16(data + 1*8); + row2 = vld1q_s16(data + 2*8); + row3 = vld1q_s16(data + 3*8); + row4 = vld1q_s16(data + 4*8); + row5 = vld1q_s16(data + 5*8); + row6 = vld1q_s16(data + 6*8); + row7 = vld1q_s16(data + 7*8); + + // add DC bias + row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); + + // column pass + dct_pass(vrshrn_n_s32, 10); + + // 16bit 8x8 transpose + { +// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. +// whether compilers actually get this is another story, sadly. +#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } +#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } + + // pass 1 + dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 + dct_trn16(row2, row3); + dct_trn16(row4, row5); + dct_trn16(row6, row7); + + // pass 2 + dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 + dct_trn32(row1, row3); + dct_trn32(row4, row6); + dct_trn32(row5, row7); + + // pass 3 + dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 + dct_trn64(row1, row5); + dct_trn64(row2, row6); + dct_trn64(row3, row7); + +#undef dct_trn16 +#undef dct_trn32 +#undef dct_trn64 + } + + // row pass + // vrshrn_n_s32 only supports shifts up to 16, we need + // 17. so do a non-rounding shift of 16 first then follow + // up with a rounding shift by 1. + dct_pass(vshrn_n_s32, 16); + + { + // pack and round + uint8x8_t p0 = vqrshrun_n_s16(row0, 1); + uint8x8_t p1 = vqrshrun_n_s16(row1, 1); + uint8x8_t p2 = vqrshrun_n_s16(row2, 1); + uint8x8_t p3 = vqrshrun_n_s16(row3, 1); + uint8x8_t p4 = vqrshrun_n_s16(row4, 1); + uint8x8_t p5 = vqrshrun_n_s16(row5, 1); + uint8x8_t p6 = vqrshrun_n_s16(row6, 1); + uint8x8_t p7 = vqrshrun_n_s16(row7, 1); + + // again, these can translate into one instruction, but often don't. +#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } +#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } + + // sadly can't use interleaved stores here since we only write + // 8 bytes to each scan line! + + // 8x8 8-bit transpose pass 1 + dct_trn8_8(p0, p1); + dct_trn8_8(p2, p3); + dct_trn8_8(p4, p5); + dct_trn8_8(p6, p7); + + // pass 2 + dct_trn8_16(p0, p2); + dct_trn8_16(p1, p3); + dct_trn8_16(p4, p6); + dct_trn8_16(p5, p7); + + // pass 3 + dct_trn8_32(p0, p4); + dct_trn8_32(p1, p5); + dct_trn8_32(p2, p6); + dct_trn8_32(p3, p7); + + // store + vst1_u8(out, p0); out += out_stride; + vst1_u8(out, p1); out += out_stride; + vst1_u8(out, p2); out += out_stride; + vst1_u8(out, p3); out += out_stride; + vst1_u8(out, p4); out += out_stride; + vst1_u8(out, p5); out += out_stride; + vst1_u8(out, p6); out += out_stride; + vst1_u8(out, p7); + +#undef dct_trn8_8 +#undef dct_trn8_16 +#undef dct_trn8_32 + } + +#undef dct_long_mul +#undef dct_long_mac +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_pass +} + +#endif // STBI_NEON + +#define STBI__MARKER_none 0xff +// if there's a pending marker from the entropy stream, return that +// otherwise, fetch from the stream and get a marker. if there's no +// marker, return 0xff, which is never a valid marker value +static stbi_uc stbi__get_marker(stbi__jpeg *j) +{ + stbi_uc x; + if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } + x = stbi__get8(j->s); + if (x != 0xff) return STBI__MARKER_none; + while (x == 0xff) + x = stbi__get8(j->s); // consume repeated 0xff fill bytes + return x; +} + +// in each scan, we'll have scan_n components, and the order +// of the components is specified by order[] +#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) + +// after a restart interval, stbi__jpeg_reset the entropy decoder and +// the dc prediction +static void stbi__jpeg_reset(stbi__jpeg *j) +{ + j->code_bits = 0; + j->code_buffer = 0; + j->nomore = 0; + j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0; + j->marker = STBI__MARKER_none; + j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; + j->eob_run = 0; + // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, + // since we don't even allow 1<<30 pixels +} + +static int stbi__parse_entropy_coded_data(stbi__jpeg *z) +{ + stbi__jpeg_reset(z); + if (!z->progressive) { + if (z->scan_n == 1) { + int i,j; + STBI_SIMD_ALIGN(short, data[64]); + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); + // every data block is an MCU, so countdown the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + // if it's NOT a restart, then just bail, so we get corrupt data + // rather than no data + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } else { // interleaved + int i,j,k,x,y; + STBI_SIMD_ALIGN(short, data[64]); + for (j=0; j < z->img_mcu_y; ++j) { + for (i=0; i < z->img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < z->scan_n; ++k) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for (y=0; y < z->img_comp[n].v; ++y) { + for (x=0; x < z->img_comp[n].h; ++x) { + int x2 = (i*z->img_comp[n].h + x)*8; + int y2 = (j*z->img_comp[n].v + y)*8; + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } + } else { + if (z->scan_n == 1) { + int i,j; + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); + if (z->spec_start == 0) { + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) + return 0; + } else { + int ha = z->img_comp[n].ha; + if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) + return 0; + } + // every data block is an MCU, so countdown the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } else { // interleaved + int i,j,k,x,y; + for (j=0; j < z->img_mcu_y; ++j) { + for (i=0; i < z->img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < z->scan_n; ++k) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for (y=0; y < z->img_comp[n].v; ++y) { + for (x=0; x < z->img_comp[n].h; ++x) { + int x2 = (i*z->img_comp[n].h + x); + int y2 = (j*z->img_comp[n].v + y); + short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) + return 0; + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--z->todo <= 0) { + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); + if (!STBI__RESTART(z->marker)) return 1; + stbi__jpeg_reset(z); + } + } + } + return 1; + } + } +} + +static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant) +{ + int i; + for (i=0; i < 64; ++i) + data[i] *= dequant[i]; +} + +static void stbi__jpeg_finish(stbi__jpeg *z) +{ + if (z->progressive) { + // dequantize and idct the data + int i,j,n; + for (n=0; n < z->s->img_n; ++n) { + int w = (z->img_comp[n].x+7) >> 3; + int h = (z->img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); + stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); + } + } + } + } +} + +static int stbi__process_marker(stbi__jpeg *z, int m) +{ + int L; + switch (m) { + case STBI__MARKER_none: // no marker found + return stbi__err("expected marker","Corrupt JPEG"); + + case 0xDD: // DRI - specify restart interval + if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); + z->restart_interval = stbi__get16be(z->s); + return 1; + + case 0xDB: // DQT - define quantization table + L = stbi__get16be(z->s)-2; + while (L > 0) { + int q = stbi__get8(z->s); + int p = q >> 4, sixteen = (p != 0); + int t = q & 15,i; + if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG"); + if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); + + for (i=0; i < 64; ++i) + z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s)); + L -= (sixteen ? 129 : 65); + } + return L==0; + + case 0xC4: // DHT - define huffman table + L = stbi__get16be(z->s)-2; + while (L > 0) { + stbi_uc *v; + int sizes[16],i,n=0; + int q = stbi__get8(z->s); + int tc = q >> 4; + int th = q & 15; + if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); + for (i=0; i < 16; ++i) { + sizes[i] = stbi__get8(z->s); + n += sizes[i]; + } + if(n > 256) return stbi__err("bad DHT header","Corrupt JPEG"); // Loop over i < n would write past end of values! + L -= 17; + if (tc == 0) { + if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; + v = z->huff_dc[th].values; + } else { + if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; + v = z->huff_ac[th].values; + } + for (i=0; i < n; ++i) + v[i] = stbi__get8(z->s); + if (tc != 0) + stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); + L -= n; + } + return L==0; + } + + // check for comment block or APP blocks + if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { + L = stbi__get16be(z->s); + if (L < 2) { + if (m == 0xFE) + return stbi__err("bad COM len","Corrupt JPEG"); + else + return stbi__err("bad APP len","Corrupt JPEG"); + } + L -= 2; + + if (m == 0xE0 && L >= 5) { // JFIF APP0 segment + static const unsigned char tag[5] = {'J','F','I','F','\0'}; + int ok = 1; + int i; + for (i=0; i < 5; ++i) + if (stbi__get8(z->s) != tag[i]) + ok = 0; + L -= 5; + if (ok) + z->jfif = 1; + } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment + static const unsigned char tag[6] = {'A','d','o','b','e','\0'}; + int ok = 1; + int i; + for (i=0; i < 6; ++i) + if (stbi__get8(z->s) != tag[i]) + ok = 0; + L -= 6; + if (ok) { + stbi__get8(z->s); // version + stbi__get16be(z->s); // flags0 + stbi__get16be(z->s); // flags1 + z->app14_color_transform = stbi__get8(z->s); // color transform + L -= 6; + } + } + + stbi__skip(z->s, L); + return 1; + } + + return stbi__err("unknown marker","Corrupt JPEG"); +} + +// after we see SOS +static int stbi__process_scan_header(stbi__jpeg *z) +{ + int i; + int Ls = stbi__get16be(z->s); + z->scan_n = stbi__get8(z->s); + if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); + if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); + for (i=0; i < z->scan_n; ++i) { + int id = stbi__get8(z->s), which; + int q = stbi__get8(z->s); + for (which = 0; which < z->s->img_n; ++which) + if (z->img_comp[which].id == id) + break; + if (which == z->s->img_n) return 0; // no match + z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); + z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); + z->order[i] = which; + } + + { + int aa; + z->spec_start = stbi__get8(z->s); + z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 + aa = stbi__get8(z->s); + z->succ_high = (aa >> 4); + z->succ_low = (aa & 15); + if (z->progressive) { + if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) + return stbi__err("bad SOS", "Corrupt JPEG"); + } else { + if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); + if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); + z->spec_end = 63; + } + } + + return 1; +} + +static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why) +{ + int i; + for (i=0; i < ncomp; ++i) { + if (z->img_comp[i].raw_data) { + STBI_FREE(z->img_comp[i].raw_data); + z->img_comp[i].raw_data = NULL; + z->img_comp[i].data = NULL; + } + if (z->img_comp[i].raw_coeff) { + STBI_FREE(z->img_comp[i].raw_coeff); + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].coeff = 0; + } + if (z->img_comp[i].linebuf) { + STBI_FREE(z->img_comp[i].linebuf); + z->img_comp[i].linebuf = NULL; + } + } + return why; +} + +static int stbi__process_frame_header(stbi__jpeg *z, int scan) +{ + stbi__context *s = z->s; + int Lf,p,i,q, h_max=1,v_max=1,c; + Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG + p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline + s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG + s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + c = stbi__get8(s); + if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG"); + s->img_n = c; + for (i=0; i < c; ++i) { + z->img_comp[i].data = NULL; + z->img_comp[i].linebuf = NULL; + } + + if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG"); + + z->rgb = 0; + for (i=0; i < s->img_n; ++i) { + static const unsigned char rgb[3] = { 'R', 'G', 'B' }; + z->img_comp[i].id = stbi__get8(s); + if (s->img_n == 3 && z->img_comp[i].id == rgb[i]) + ++z->rgb; + q = stbi__get8(s); + z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); + z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); + z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG"); + } + + if (scan != STBI__SCAN_load) return 1; + + if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode"); + + for (i=0; i < s->img_n; ++i) { + if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; + if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; + } + + // check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios + // and I've never seen a non-corrupted JPEG file actually use them + for (i=0; i < s->img_n; ++i) { + if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG"); + if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG"); + } + + // compute interleaved mcu info + z->img_h_max = h_max; + z->img_v_max = v_max; + z->img_mcu_w = h_max * 8; + z->img_mcu_h = v_max * 8; + // these sizes can't be more than 17 bits + z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; + z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; + + for (i=0; i < s->img_n; ++i) { + // number of effective pixels (e.g. for non-interleaved MCU) + z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; + z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; + // to simplify generation, we'll allocate enough memory to decode + // the bogus oversized data from using interleaved MCUs and their + // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't + // discard the extra data until colorspace conversion + // + // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) + // so these muls can't overflow with 32-bit ints (which we require) + z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; + z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; + z->img_comp[i].coeff = 0; + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].linebuf = NULL; + z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15); + if (z->img_comp[i].raw_data == NULL) + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); + // align blocks for idct using mmx/sse + z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); + if (z->progressive) { + // w2, h2 are multiples of 8 (see above) + z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; + z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; + z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15); + if (z->img_comp[i].raw_coeff == NULL) + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); + z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); + } + } + + return 1; +} + +// use comparisons since in some cases we handle more than one case (e.g. SOF) +#define stbi__DNL(x) ((x) == 0xdc) +#define stbi__SOI(x) ((x) == 0xd8) +#define stbi__EOI(x) ((x) == 0xd9) +#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) +#define stbi__SOS(x) ((x) == 0xda) + +#define stbi__SOF_progressive(x) ((x) == 0xc2) + +static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) +{ + int m; + z->jfif = 0; + z->app14_color_transform = -1; // valid values are 0,1,2 + z->marker = STBI__MARKER_none; // initialize cached marker to empty + m = stbi__get_marker(z); + if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); + if (scan == STBI__SCAN_type) return 1; + m = stbi__get_marker(z); + while (!stbi__SOF(m)) { + if (!stbi__process_marker(z,m)) return 0; + m = stbi__get_marker(z); + while (m == STBI__MARKER_none) { + // some files have extra padding after their blocks, so ok, we'll scan + if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); + m = stbi__get_marker(z); + } + } + z->progressive = stbi__SOF_progressive(m); + if (!stbi__process_frame_header(z, scan)) return 0; + return 1; +} + +static stbi_uc stbi__skip_jpeg_junk_at_end(stbi__jpeg *j) +{ + // some JPEGs have junk at end, skip over it but if we find what looks + // like a valid marker, resume there + while (!stbi__at_eof(j->s)) { + stbi_uc x = stbi__get8(j->s); + while (x == 0xff) { // might be a marker + if (stbi__at_eof(j->s)) return STBI__MARKER_none; + x = stbi__get8(j->s); + if (x != 0x00 && x != 0xff) { + // not a stuffed zero or lead-in to another marker, looks + // like an actual marker, return it + return x; + } + // stuffed zero has x=0 now which ends the loop, meaning we go + // back to regular scan loop. + // repeated 0xff keeps trying to read the next byte of the marker. + } + } + return STBI__MARKER_none; +} + +// decode image to YCbCr format +static int stbi__decode_jpeg_image(stbi__jpeg *j) +{ + int m; + for (m = 0; m < 4; m++) { + j->img_comp[m].raw_data = NULL; + j->img_comp[m].raw_coeff = NULL; + } + j->restart_interval = 0; + if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; + m = stbi__get_marker(j); + while (!stbi__EOI(m)) { + if (stbi__SOS(m)) { + if (!stbi__process_scan_header(j)) return 0; + if (!stbi__parse_entropy_coded_data(j)) return 0; + if (j->marker == STBI__MARKER_none ) { + j->marker = stbi__skip_jpeg_junk_at_end(j); + // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 + } + m = stbi__get_marker(j); + if (STBI__RESTART(m)) + m = stbi__get_marker(j); + } else if (stbi__DNL(m)) { + int Ld = stbi__get16be(j->s); + stbi__uint32 NL = stbi__get16be(j->s); + if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG"); + if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG"); + m = stbi__get_marker(j); + } else { + if (!stbi__process_marker(j, m)) return 1; + m = stbi__get_marker(j); + } + } + if (j->progressive) + stbi__jpeg_finish(j); + return 1; +} + +// static jfif-centered resampling (across block boundaries) + +typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1, + int w, int hs); + +#define stbi__div4(x) ((stbi_uc) ((x) >> 2)) + +static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + STBI_NOTUSED(out); + STBI_NOTUSED(in_far); + STBI_NOTUSED(w); + STBI_NOTUSED(hs); + return in_near; +} + +static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate two samples vertically for every one in input + int i; + STBI_NOTUSED(hs); + for (i=0; i < w; ++i) + out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2); + return out; +} + +static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate two samples horizontally for every one in input + int i; + stbi_uc *input = in_near; + + if (w == 1) { + // if only one sample, can't do any interpolation + out[0] = out[1] = input[0]; + return out; + } + + out[0] = input[0]; + out[1] = stbi__div4(input[0]*3 + input[1] + 2); + for (i=1; i < w-1; ++i) { + int n = 3*input[i]+2; + out[i*2+0] = stbi__div4(n+input[i-1]); + out[i*2+1] = stbi__div4(n+input[i+1]); + } + out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2); + out[i*2+1] = input[w-1]; + + STBI_NOTUSED(in_far); + STBI_NOTUSED(hs); + + return out; +} + +#define stbi__div16(x) ((stbi_uc) ((x) >> 4)) + +static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate 2x2 samples for every one in input + int i,t0,t1; + if (w == 1) { + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); + return out; + } + + t1 = 3*in_near[0] + in_far[0]; + out[0] = stbi__div4(t1+2); + for (i=1; i < w; ++i) { + t0 = t1; + t1 = 3*in_near[i]+in_far[i]; + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); + } + out[w*2-1] = stbi__div4(t1+2); + + STBI_NOTUSED(hs); + + return out; +} + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // need to generate 2x2 samples for every one in input + int i=0,t0,t1; + + if (w == 1) { + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); + return out; + } + + t1 = 3*in_near[0] + in_far[0]; + // process groups of 8 pixels for as long as we can. + // note we can't handle the last pixel in a row in this loop + // because we need to handle the filter boundary conditions. + for (; i < ((w-1) & ~7); i += 8) { +#if defined(STBI_SSE2) + // load and perform the vertical filtering pass + // this uses 3*x + y = 4*x + (y - x) + __m128i zero = _mm_setzero_si128(); + __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); + __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); + __m128i farw = _mm_unpacklo_epi8(farb, zero); + __m128i nearw = _mm_unpacklo_epi8(nearb, zero); + __m128i diff = _mm_sub_epi16(farw, nearw); + __m128i nears = _mm_slli_epi16(nearw, 2); + __m128i curr = _mm_add_epi16(nears, diff); // current row + + // horizontal filter works the same based on shifted vers of current + // row. "prev" is current row shifted right by 1 pixel; we need to + // insert the previous pixel value (from t1). + // "next" is current row shifted left by 1 pixel, with first pixel + // of next block of 8 pixels added in. + __m128i prv0 = _mm_slli_si128(curr, 2); + __m128i nxt0 = _mm_srli_si128(curr, 2); + __m128i prev = _mm_insert_epi16(prv0, t1, 0); + __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); + + // horizontal filter, polyphase implementation since it's convenient: + // even pixels = 3*cur + prev = cur*4 + (prev - cur) + // odd pixels = 3*cur + next = cur*4 + (next - cur) + // note the shared term. + __m128i bias = _mm_set1_epi16(8); + __m128i curs = _mm_slli_epi16(curr, 2); + __m128i prvd = _mm_sub_epi16(prev, curr); + __m128i nxtd = _mm_sub_epi16(next, curr); + __m128i curb = _mm_add_epi16(curs, bias); + __m128i even = _mm_add_epi16(prvd, curb); + __m128i odd = _mm_add_epi16(nxtd, curb); + + // interleave even and odd pixels, then undo scaling. + __m128i int0 = _mm_unpacklo_epi16(even, odd); + __m128i int1 = _mm_unpackhi_epi16(even, odd); + __m128i de0 = _mm_srli_epi16(int0, 4); + __m128i de1 = _mm_srli_epi16(int1, 4); + + // pack and write output + __m128i outv = _mm_packus_epi16(de0, de1); + _mm_storeu_si128((__m128i *) (out + i*2), outv); +#elif defined(STBI_NEON) + // load and perform the vertical filtering pass + // this uses 3*x + y = 4*x + (y - x) + uint8x8_t farb = vld1_u8(in_far + i); + uint8x8_t nearb = vld1_u8(in_near + i); + int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); + int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); + int16x8_t curr = vaddq_s16(nears, diff); // current row + + // horizontal filter works the same based on shifted vers of current + // row. "prev" is current row shifted right by 1 pixel; we need to + // insert the previous pixel value (from t1). + // "next" is current row shifted left by 1 pixel, with first pixel + // of next block of 8 pixels added in. + int16x8_t prv0 = vextq_s16(curr, curr, 7); + int16x8_t nxt0 = vextq_s16(curr, curr, 1); + int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); + int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); + + // horizontal filter, polyphase implementation since it's convenient: + // even pixels = 3*cur + prev = cur*4 + (prev - cur) + // odd pixels = 3*cur + next = cur*4 + (next - cur) + // note the shared term. + int16x8_t curs = vshlq_n_s16(curr, 2); + int16x8_t prvd = vsubq_s16(prev, curr); + int16x8_t nxtd = vsubq_s16(next, curr); + int16x8_t even = vaddq_s16(curs, prvd); + int16x8_t odd = vaddq_s16(curs, nxtd); + + // undo scaling and round, then store with even/odd phases interleaved + uint8x8x2_t o; + o.val[0] = vqrshrun_n_s16(even, 4); + o.val[1] = vqrshrun_n_s16(odd, 4); + vst2_u8(out + i*2, o); +#endif + + // "previous" value for next iter + t1 = 3*in_near[i+7] + in_far[i+7]; + } + + t0 = t1; + t1 = 3*in_near[i] + in_far[i]; + out[i*2] = stbi__div16(3*t1 + t0 + 8); + + for (++i; i < w; ++i) { + t0 = t1; + t1 = 3*in_near[i]+in_far[i]; + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); + } + out[w*2-1] = stbi__div4(t1+2); + + STBI_NOTUSED(hs); + + return out; +} +#endif + +static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) +{ + // resample with nearest-neighbor + int i,j; + STBI_NOTUSED(in_far); + for (i=0; i < w; ++i) + for (j=0; j < hs; ++j) + out[i*hs+j] = in_near[i]; + return out; +} + +// this is a reduced-precision calculation of YCbCr-to-RGB introduced +// to make sure the code produces the same results in both SIMD and scalar +#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) +static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) +{ + int i; + for (i=0; i < count; ++i) { + int y_fixed = (y[i] << 20) + (1<<19); // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr* stbi__float2fixed(1.40200f); + g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* stbi__float2fixed(1.77200f); + r >>= 20; + g >>= 20; + b >>= 20; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step) +{ + int i = 0; + +#ifdef STBI_SSE2 + // step == 3 is pretty ugly on the final interleave, and i'm not convinced + // it's useful in practice (you wouldn't use it for textures, for example). + // so just accelerate step == 4 case. + if (step == 4) { + // this is a fairly straightforward implementation and not super-optimized. + __m128i signflip = _mm_set1_epi8(-0x80); + __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); + __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); + __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); + __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); + __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); + __m128i xw = _mm_set1_epi16(255); // alpha channel + + for (; i+7 < count; i += 8) { + // load + __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); + __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); + __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); + __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 + __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 + + // unpack to short (and left-shift cr, cb by 8) + __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); + __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); + __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); + + // color transform + __m128i yws = _mm_srli_epi16(yw, 4); + __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); + __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); + __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); + __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); + __m128i rws = _mm_add_epi16(cr0, yws); + __m128i gwt = _mm_add_epi16(cb0, yws); + __m128i bws = _mm_add_epi16(yws, cb1); + __m128i gws = _mm_add_epi16(gwt, cr1); + + // descale + __m128i rw = _mm_srai_epi16(rws, 4); + __m128i bw = _mm_srai_epi16(bws, 4); + __m128i gw = _mm_srai_epi16(gws, 4); + + // back to byte, set up for transpose + __m128i brb = _mm_packus_epi16(rw, bw); + __m128i gxb = _mm_packus_epi16(gw, xw); + + // transpose to interleave channels + __m128i t0 = _mm_unpacklo_epi8(brb, gxb); + __m128i t1 = _mm_unpackhi_epi8(brb, gxb); + __m128i o0 = _mm_unpacklo_epi16(t0, t1); + __m128i o1 = _mm_unpackhi_epi16(t0, t1); + + // store + _mm_storeu_si128((__m128i *) (out + 0), o0); + _mm_storeu_si128((__m128i *) (out + 16), o1); + out += 32; + } + } +#endif + +#ifdef STBI_NEON + // in this version, step=3 support would be easy to add. but is there demand? + if (step == 4) { + // this is a fairly straightforward implementation and not super-optimized. + uint8x8_t signflip = vdup_n_u8(0x80); + int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); + int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); + int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); + int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); + + for (; i+7 < count; i += 8) { + // load + uint8x8_t y_bytes = vld1_u8(y + i); + uint8x8_t cr_bytes = vld1_u8(pcr + i); + uint8x8_t cb_bytes = vld1_u8(pcb + i); + int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); + int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); + + // expand to s16 + int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); + int16x8_t crw = vshll_n_s8(cr_biased, 7); + int16x8_t cbw = vshll_n_s8(cb_biased, 7); + + // color transform + int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); + int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); + int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); + int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); + int16x8_t rws = vaddq_s16(yws, cr0); + int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); + int16x8_t bws = vaddq_s16(yws, cb1); + + // undo scaling, round, convert to byte + uint8x8x4_t o; + o.val[0] = vqrshrun_n_s16(rws, 4); + o.val[1] = vqrshrun_n_s16(gws, 4); + o.val[2] = vqrshrun_n_s16(bws, 4); + o.val[3] = vdup_n_u8(255); + + // store, interleaving r/g/b/a + vst4_u8(out, o); + out += 8*4; + } + } +#endif + + for (; i < count; ++i) { + int y_fixed = (y[i] << 20) + (1<<19); // rounding + int r,g,b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr* stbi__float2fixed(1.40200f); + g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* stbi__float2fixed(1.77200f); + r >>= 20; + g >>= 20; + b >>= 20; + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} +#endif + +// set up the kernels +static void stbi__setup_jpeg(stbi__jpeg *j) +{ + j->idct_block_kernel = stbi__idct_block; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; + +#ifdef STBI_SSE2 + if (stbi__sse2_available()) { + j->idct_block_kernel = stbi__idct_simd; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; + } +#endif + +#ifdef STBI_NEON + j->idct_block_kernel = stbi__idct_simd; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; +#endif +} + +// clean up the temporary component buffers +static void stbi__cleanup_jpeg(stbi__jpeg *j) +{ + stbi__free_jpeg_components(j, j->s->img_n, 0); +} + +typedef struct +{ + resample_row_func resample; + stbi_uc *line0,*line1; + int hs,vs; // expansion factor in each axis + int w_lores; // horizontal pixels pre-expansion + int ystep; // how far through vertical expansion we are + int ypos; // which pre-expansion row we're on +} stbi__resample; + +// fast 0..255 * 0..255 => 0..255 rounded multiplication +static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y) +{ + unsigned int t = x*y + 128; + return (stbi_uc) ((t + (t >>8)) >> 8); +} + +static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) +{ + int n, decode_n, is_rgb; + z->s->img_n = 0; // make stbi__cleanup_jpeg safe + + // validate req_comp + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); + + // load a jpeg image from whichever source, but leave in YCbCr format + if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } + + // determine actual number of components to generate + n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1; + + is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif)); + + if (z->s->img_n == 3 && n < 3 && !is_rgb) + decode_n = 1; + else + decode_n = z->s->img_n; + + // nothing to do if no components requested; check this now to avoid + // accessing uninitialized coutput[0] later + if (decode_n <= 0) { stbi__cleanup_jpeg(z); return NULL; } + + // resample and color-convert + { + int k; + unsigned int i,j; + stbi_uc *output; + stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL }; + + stbi__resample res_comp[4]; + + for (k=0; k < decode_n; ++k) { + stbi__resample *r = &res_comp[k]; + + // allocate line buffer big enough for upsampling off the edges + // with upsample factor of 4 + z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3); + if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + + r->hs = z->img_h_max / z->img_comp[k].h; + r->vs = z->img_v_max / z->img_comp[k].v; + r->ystep = r->vs >> 1; + r->w_lores = (z->s->img_x + r->hs-1) / r->hs; + r->ypos = 0; + r->line0 = r->line1 = z->img_comp[k].data; + + if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; + else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; + else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; + else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; + else r->resample = stbi__resample_row_generic; + } + + // can't error after this so, this is safe + output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1); + if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + + // now go ahead and resample + for (j=0; j < z->s->img_y; ++j) { + stbi_uc *out = output + n * z->s->img_x * j; + for (k=0; k < decode_n; ++k) { + stbi__resample *r = &res_comp[k]; + int y_bot = r->ystep >= (r->vs >> 1); + coutput[k] = r->resample(z->img_comp[k].linebuf, + y_bot ? r->line1 : r->line0, + y_bot ? r->line0 : r->line1, + r->w_lores, r->hs); + if (++r->ystep >= r->vs) { + r->ystep = 0; + r->line0 = r->line1; + if (++r->ypos < z->img_comp[k].y) + r->line1 += z->img_comp[k].w2; + } + } + if (n >= 3) { + stbi_uc *y = coutput[0]; + if (z->s->img_n == 3) { + if (is_rgb) { + for (i=0; i < z->s->img_x; ++i) { + out[0] = y[i]; + out[1] = coutput[1][i]; + out[2] = coutput[2][i]; + out[3] = 255; + out += n; + } + } else { + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + } + } else if (z->s->img_n == 4) { + if (z->app14_color_transform == 0) { // CMYK + for (i=0; i < z->s->img_x; ++i) { + stbi_uc m = coutput[3][i]; + out[0] = stbi__blinn_8x8(coutput[0][i], m); + out[1] = stbi__blinn_8x8(coutput[1][i], m); + out[2] = stbi__blinn_8x8(coutput[2][i], m); + out[3] = 255; + out += n; + } + } else if (z->app14_color_transform == 2) { // YCCK + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + for (i=0; i < z->s->img_x; ++i) { + stbi_uc m = coutput[3][i]; + out[0] = stbi__blinn_8x8(255 - out[0], m); + out[1] = stbi__blinn_8x8(255 - out[1], m); + out[2] = stbi__blinn_8x8(255 - out[2], m); + out += n; + } + } else { // YCbCr + alpha? Ignore the fourth channel for now + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + } + } else + for (i=0; i < z->s->img_x; ++i) { + out[0] = out[1] = out[2] = y[i]; + out[3] = 255; // not used if n==3 + out += n; + } + } else { + if (is_rgb) { + if (n == 1) + for (i=0; i < z->s->img_x; ++i) + *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); + else { + for (i=0; i < z->s->img_x; ++i, out += 2) { + out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); + out[1] = 255; + } + } + } else if (z->s->img_n == 4 && z->app14_color_transform == 0) { + for (i=0; i < z->s->img_x; ++i) { + stbi_uc m = coutput[3][i]; + stbi_uc r = stbi__blinn_8x8(coutput[0][i], m); + stbi_uc g = stbi__blinn_8x8(coutput[1][i], m); + stbi_uc b = stbi__blinn_8x8(coutput[2][i], m); + out[0] = stbi__compute_y(r, g, b); + out[1] = 255; + out += n; + } + } else if (z->s->img_n == 4 && z->app14_color_transform == 2) { + for (i=0; i < z->s->img_x; ++i) { + out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]); + out[1] = 255; + out += n; + } + } else { + stbi_uc *y = coutput[0]; + if (n == 1) + for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; + else + for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; } + } + } + } + stbi__cleanup_jpeg(z); + *out_x = z->s->img_x; + *out_y = z->s->img_y; + if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output + return output; + } +} + +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + unsigned char* result; + stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); + if (!j) return stbi__errpuc("outofmem", "Out of memory"); + memset(j, 0, sizeof(stbi__jpeg)); + STBI_NOTUSED(ri); + j->s = s; + stbi__setup_jpeg(j); + result = load_jpeg_image(j, x,y,comp,req_comp); + STBI_FREE(j); + return result; +} + +static int stbi__jpeg_test(stbi__context *s) +{ + int r; + stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); + if (!j) return stbi__err("outofmem", "Out of memory"); + memset(j, 0, sizeof(stbi__jpeg)); + j->s = s; + stbi__setup_jpeg(j); + r = stbi__decode_jpeg_header(j, STBI__SCAN_type); + stbi__rewind(s); + STBI_FREE(j); + return r; +} + +static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) +{ + if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { + stbi__rewind( j->s ); + return 0; + } + if (x) *x = j->s->img_x; + if (y) *y = j->s->img_y; + if (comp) *comp = j->s->img_n >= 3 ? 3 : 1; + return 1; +} + +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) +{ + int result; + stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); + if (!j) return stbi__err("outofmem", "Out of memory"); + memset(j, 0, sizeof(stbi__jpeg)); + j->s = s; + result = stbi__jpeg_info_raw(j, x, y, comp); + STBI_FREE(j); + return result; +} +#endif + +// public domain zlib decode v0.2 Sean Barrett 2006-11-18 +// simple implementation +// - all input must be provided in an upfront buffer +// - all output is written to a single output buffer (can malloc/realloc) +// performance +// - fast huffman + +#ifndef STBI_NO_ZLIB + +// fast-way is faster to check than jpeg huffman, but slow way is slower +#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables +#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) +#define STBI__ZNSYMS 288 // number of symbols in literal/length alphabet + +// zlib-style huffman encoding +// (jpegs packs from left, zlib from right, so can't share code) +typedef struct +{ + stbi__uint16 fast[1 << STBI__ZFAST_BITS]; + stbi__uint16 firstcode[16]; + int maxcode[17]; + stbi__uint16 firstsymbol[16]; + stbi_uc size[STBI__ZNSYMS]; + stbi__uint16 value[STBI__ZNSYMS]; +} stbi__zhuffman; + +stbi_inline static int stbi__bitreverse16(int n) +{ + n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); + n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); + n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); + n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); + return n; +} + +stbi_inline static int stbi__bit_reverse(int v, int bits) +{ + STBI_ASSERT(bits <= 16); + // to bit reverse n bits, reverse 16 and shift + // e.g. 11 bits, bit reverse and shift away 5 + return stbi__bitreverse16(v) >> (16-bits); +} + +static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num) +{ + int i,k=0; + int code, next_code[16], sizes[17]; + + // DEFLATE spec for generating codes + memset(sizes, 0, sizeof(sizes)); + memset(z->fast, 0, sizeof(z->fast)); + for (i=0; i < num; ++i) + ++sizes[sizelist[i]]; + sizes[0] = 0; + for (i=1; i < 16; ++i) + if (sizes[i] > (1 << i)) + return stbi__err("bad sizes", "Corrupt PNG"); + code = 0; + for (i=1; i < 16; ++i) { + next_code[i] = code; + z->firstcode[i] = (stbi__uint16) code; + z->firstsymbol[i] = (stbi__uint16) k; + code = (code + sizes[i]); + if (sizes[i]) + if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG"); + z->maxcode[i] = code << (16-i); // preshift for inner loop + code <<= 1; + k += sizes[i]; + } + z->maxcode[16] = 0x10000; // sentinel + for (i=0; i < num; ++i) { + int s = sizelist[i]; + if (s) { + int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; + stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i); + z->size [c] = (stbi_uc ) s; + z->value[c] = (stbi__uint16) i; + if (s <= STBI__ZFAST_BITS) { + int j = stbi__bit_reverse(next_code[s],s); + while (j < (1 << STBI__ZFAST_BITS)) { + z->fast[j] = fastv; + j += (1 << s); + } + } + ++next_code[s]; + } + } + return 1; +} + +// zlib-from-memory implementation for PNG reading +// because PNG allows splitting the zlib stream arbitrarily, +// and it's annoying structurally to have PNG call ZLIB call PNG, +// we require PNG read all the IDATs and combine them into a single +// memory buffer + +typedef struct +{ + stbi_uc *zbuffer, *zbuffer_end; + int num_bits; + int hit_zeof_once; + stbi__uint32 code_buffer; + + char *zout; + char *zout_start; + char *zout_end; + int z_expandable; + + stbi__zhuffman z_length, z_distance; +} stbi__zbuf; + +stbi_inline static int stbi__zeof(stbi__zbuf *z) +{ + return (z->zbuffer >= z->zbuffer_end); +} + +stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z) +{ + return stbi__zeof(z) ? 0 : *z->zbuffer++; +} + +static void stbi__fill_bits(stbi__zbuf *z) +{ + do { + if (z->code_buffer >= (1U << z->num_bits)) { + z->zbuffer = z->zbuffer_end; /* treat this as EOF so we fail. */ + return; + } + z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits; + z->num_bits += 8; + } while (z->num_bits <= 24); +} + +stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) +{ + unsigned int k; + if (z->num_bits < n) stbi__fill_bits(z); + k = z->code_buffer & ((1 << n) - 1); + z->code_buffer >>= n; + z->num_bits -= n; + return k; +} + +static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) +{ + int b,s,k; + // not resolved by fast table, so compute it the slow way + // use jpeg approach, which requires MSbits at top + k = stbi__bit_reverse(a->code_buffer, 16); + for (s=STBI__ZFAST_BITS+1; ; ++s) + if (k < z->maxcode[s]) + break; + if (s >= 16) return -1; // invalid code! + // code size is s, so: + b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; + if (b >= STBI__ZNSYMS) return -1; // some data was corrupt somewhere! + if (z->size[b] != s) return -1; // was originally an assert, but report failure instead. + a->code_buffer >>= s; + a->num_bits -= s; + return z->value[b]; +} + +stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) +{ + int b,s; + if (a->num_bits < 16) { + if (stbi__zeof(a)) { + if (!a->hit_zeof_once) { + // This is the first time we hit eof, insert 16 extra padding btis + // to allow us to keep going; if we actually consume any of them + // though, that is invalid data. This is caught later. + a->hit_zeof_once = 1; + a->num_bits += 16; // add 16 implicit zero bits + } else { + // We already inserted our extra 16 padding bits and are again + // out, this stream is actually prematurely terminated. + return -1; + } + } else { + stbi__fill_bits(a); + } + } + b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; + if (b) { + s = b >> 9; + a->code_buffer >>= s; + a->num_bits -= s; + return b & 511; + } + return stbi__zhuffman_decode_slowpath(a, z); +} + +static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes +{ + char *q; + unsigned int cur, limit, old_limit; + z->zout = zout; + if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); + cur = (unsigned int) (z->zout - z->zout_start); + limit = old_limit = (unsigned) (z->zout_end - z->zout_start); + if (UINT_MAX - cur < (unsigned) n) return stbi__err("outofmem", "Out of memory"); + while (cur + n > limit) { + if(limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory"); + limit *= 2; + } + q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); + STBI_NOTUSED(old_limit); + if (q == NULL) return stbi__err("outofmem", "Out of memory"); + z->zout_start = q; + z->zout = q + cur; + z->zout_end = q + limit; + return 1; +} + +static const int stbi__zlength_base[31] = { + 3,4,5,6,7,8,9,10,11,13, + 15,17,19,23,27,31,35,43,51,59, + 67,83,99,115,131,163,195,227,258,0,0 }; + +static const int stbi__zlength_extra[31]= +{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; + +static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, +257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; + +static const int stbi__zdist_extra[32] = +{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; + +static int stbi__parse_huffman_block(stbi__zbuf *a) +{ + char *zout = a->zout; + for(;;) { + int z = stbi__zhuffman_decode(a, &a->z_length); + if (z < 256) { + if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes + if (zout >= a->zout_end) { + if (!stbi__zexpand(a, zout, 1)) return 0; + zout = a->zout; + } + *zout++ = (char) z; + } else { + stbi_uc *p; + int len,dist; + if (z == 256) { + a->zout = zout; + if (a->hit_zeof_once && a->num_bits < 16) { + // The first time we hit zeof, we inserted 16 extra zero bits into our bit + // buffer so the decoder can just do its speculative decoding. But if we + // actually consumed any of those bits (which is the case when num_bits < 16), + // the stream actually read past the end so it is malformed. + return stbi__err("unexpected end","Corrupt PNG"); + } + return 1; + } + if (z >= 286) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, length codes 286 and 287 must not appear in compressed data + z -= 257; + len = stbi__zlength_base[z]; + if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]); + z = stbi__zhuffman_decode(a, &a->z_distance); + if (z < 0 || z >= 30) return stbi__err("bad huffman code","Corrupt PNG"); // per DEFLATE, distance codes 30 and 31 must not appear in compressed data + dist = stbi__zdist_base[z]; + if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]); + if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG"); + if (len > a->zout_end - zout) { + if (!stbi__zexpand(a, zout, len)) return 0; + zout = a->zout; + } + p = (stbi_uc *) (zout - dist); + if (dist == 1) { // run of one byte; common in images. + stbi_uc v = *p; + if (len) { do *zout++ = v; while (--len); } + } else { + if (len) { do *zout++ = *p++; while (--len); } + } + } + } +} + +static int stbi__compute_huffman_codes(stbi__zbuf *a) +{ + static const stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; + stbi__zhuffman z_codelength; + stbi_uc lencodes[286+32+137];//padding for maximum single op + stbi_uc codelength_sizes[19]; + int i,n; + + int hlit = stbi__zreceive(a,5) + 257; + int hdist = stbi__zreceive(a,5) + 1; + int hclen = stbi__zreceive(a,4) + 4; + int ntot = hlit + hdist; + + memset(codelength_sizes, 0, sizeof(codelength_sizes)); + for (i=0; i < hclen; ++i) { + int s = stbi__zreceive(a,3); + codelength_sizes[length_dezigzag[i]] = (stbi_uc) s; + } + if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; + + n = 0; + while (n < ntot) { + int c = stbi__zhuffman_decode(a, &z_codelength); + if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG"); + if (c < 16) + lencodes[n++] = (stbi_uc) c; + else { + stbi_uc fill = 0; + if (c == 16) { + c = stbi__zreceive(a,2)+3; + if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG"); + fill = lencodes[n-1]; + } else if (c == 17) { + c = stbi__zreceive(a,3)+3; + } else if (c == 18) { + c = stbi__zreceive(a,7)+11; + } else { + return stbi__err("bad codelengths", "Corrupt PNG"); + } + if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG"); + memset(lencodes+n, fill, c); + n += c; + } + } + if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG"); + if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; + if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; + return 1; +} + +static int stbi__parse_uncompressed_block(stbi__zbuf *a) +{ + stbi_uc header[4]; + int len,nlen,k; + if (a->num_bits & 7) + stbi__zreceive(a, a->num_bits & 7); // discard + // drain the bit-packed data into header + k = 0; + while (a->num_bits > 0) { + header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check + a->code_buffer >>= 8; + a->num_bits -= 8; + } + if (a->num_bits < 0) return stbi__err("zlib corrupt","Corrupt PNG"); + // now fill header the normal way + while (k < 4) + header[k++] = stbi__zget8(a); + len = header[1] * 256 + header[0]; + nlen = header[3] * 256 + header[2]; + if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG"); + if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG"); + if (a->zout + len > a->zout_end) + if (!stbi__zexpand(a, a->zout, len)) return 0; + memcpy(a->zout, a->zbuffer, len); + a->zbuffer += len; + a->zout += len; + return 1; +} + +static int stbi__parse_zlib_header(stbi__zbuf *a) +{ + int cmf = stbi__zget8(a); + int cm = cmf & 15; + /* int cinfo = cmf >> 4; */ + int flg = stbi__zget8(a); + if (stbi__zeof(a)) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec + if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec + if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png + if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png + // window = 1 << (8 + cinfo)... but who cares, we fully buffer output + return 1; +} + +static const stbi_uc stbi__zdefault_length[STBI__ZNSYMS] = +{ + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8 +}; +static const stbi_uc stbi__zdefault_distance[32] = +{ + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 +}; +/* +Init algorithm: +{ + int i; // use <= to match clearly with spec + for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; + for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; + for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; + for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; + + for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; +} +*/ + +static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) +{ + int final, type; + if (parse_header) + if (!stbi__parse_zlib_header(a)) return 0; + a->num_bits = 0; + a->code_buffer = 0; + a->hit_zeof_once = 0; + do { + final = stbi__zreceive(a,1); + type = stbi__zreceive(a,2); + if (type == 0) { + if (!stbi__parse_uncompressed_block(a)) return 0; + } else if (type == 3) { + return 0; + } else { + if (type == 1) { + // use fixed code lengths + if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , STBI__ZNSYMS)) return 0; + if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; + } else { + if (!stbi__compute_huffman_codes(a)) return 0; + } + if (!stbi__parse_huffman_block(a)) return 0; + } + } while (!final); + return 1; +} + +static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) +{ + a->zout_start = obuf; + a->zout = obuf; + a->zout_end = obuf + olen; + a->z_expandable = exp; + + return stbi__parse_zlib(a, parse_header); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(initial_size); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer + len; + if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) +{ + return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(initial_size); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer + len; + if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) +{ + stbi__zbuf a; + a.zbuffer = (stbi_uc *) ibuffer; + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; + if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) + return (int) (a.zout - a.zout_start); + else + return -1; +} + +STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) +{ + stbi__zbuf a; + char *p = (char *) stbi__malloc(16384); + if (p == NULL) return NULL; + a.zbuffer = (stbi_uc *) buffer; + a.zbuffer_end = (stbi_uc *) buffer+len; + if (stbi__do_zlib(&a, p, 16384, 1, 0)) { + if (outlen) *outlen = (int) (a.zout - a.zout_start); + return a.zout_start; + } else { + STBI_FREE(a.zout_start); + return NULL; + } +} + +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) +{ + stbi__zbuf a; + a.zbuffer = (stbi_uc *) ibuffer; + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; + if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) + return (int) (a.zout - a.zout_start); + else + return -1; +} +#endif + +// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 +// simple implementation +// - only 8-bit samples +// - no CRC checking +// - allocates lots of intermediate memory +// - avoids problem of streaming data between subsystems +// - avoids explicit window management +// performance +// - uses stb_zlib, a PD zlib implementation with fast huffman decoding + +#ifndef STBI_NO_PNG +typedef struct +{ + stbi__uint32 length; + stbi__uint32 type; +} stbi__pngchunk; + +static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) +{ + stbi__pngchunk c; + c.length = stbi__get32be(s); + c.type = stbi__get32be(s); + return c; +} + +static int stbi__check_png_header(stbi__context *s) +{ + static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; + int i; + for (i=0; i < 8; ++i) + if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); + return 1; +} + +typedef struct +{ + stbi__context *s; + stbi_uc *idata, *expanded, *out; + int depth; +} stbi__png; + + +enum { + STBI__F_none=0, + STBI__F_sub=1, + STBI__F_up=2, + STBI__F_avg=3, + STBI__F_paeth=4, + // synthetic filter used for first scanline to avoid needing a dummy row of 0s + STBI__F_avg_first +}; + +static stbi_uc first_row_filter[5] = +{ + STBI__F_none, + STBI__F_sub, + STBI__F_none, + STBI__F_avg_first, + STBI__F_sub // Paeth with b=c=0 turns out to be equivalent to sub +}; + +static int stbi__paeth(int a, int b, int c) +{ + // This formulation looks very different from the reference in the PNG spec, but is + // actually equivalent and has favorable data dependencies and admits straightforward + // generation of branch-free code, which helps performance significantly. + int thresh = c*3 - (a + b); + int lo = a < b ? a : b; + int hi = a < b ? b : a; + int t0 = (hi <= thresh) ? lo : c; + int t1 = (thresh <= lo) ? hi : t0; + return t1; +} + +static const stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; + +// adds an extra all-255 alpha channel +// dest == src is legal +// img_n must be 1 or 3 +static void stbi__create_png_alpha_expand8(stbi_uc *dest, stbi_uc *src, stbi__uint32 x, int img_n) +{ + int i; + // must process data backwards since we allow dest==src + if (img_n == 1) { + for (i=x-1; i >= 0; --i) { + dest[i*2+1] = 255; + dest[i*2+0] = src[i]; + } + } else { + STBI_ASSERT(img_n == 3); + for (i=x-1; i >= 0; --i) { + dest[i*4+3] = 255; + dest[i*4+2] = src[i*3+2]; + dest[i*4+1] = src[i*3+1]; + dest[i*4+0] = src[i*3+0]; + } + } +} + +// create the png data from post-deflated data +static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color) +{ + int bytes = (depth == 16 ? 2 : 1); + stbi__context *s = a->s; + stbi__uint32 i,j,stride = x*out_n*bytes; + stbi__uint32 img_len, img_width_bytes; + stbi_uc *filter_buf; + int all_ok = 1; + int k; + int img_n = s->img_n; // copy it into a local for later + + int output_bytes = out_n*bytes; + int filter_bytes = img_n*bytes; + int width = x; + + STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); + a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into + if (!a->out) return stbi__err("outofmem", "Out of memory"); + + // note: error exits here don't need to clean up a->out individually, + // stbi__do_png always does on error. + if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG"); + img_width_bytes = (((img_n * x * depth) + 7) >> 3); + if (!stbi__mad2sizes_valid(img_width_bytes, y, img_width_bytes)) return stbi__err("too large", "Corrupt PNG"); + img_len = (img_width_bytes + 1) * y; + + // we used to check for exact match between raw_len and img_len on non-interlaced PNGs, + // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros), + // so just check for raw_len < img_len always. + if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG"); + + // Allocate two scan lines worth of filter workspace buffer. + filter_buf = (stbi_uc *) stbi__malloc_mad2(img_width_bytes, 2, 0); + if (!filter_buf) return stbi__err("outofmem", "Out of memory"); + + // Filtering for low-bit-depth images + if (depth < 8) { + filter_bytes = 1; + width = img_width_bytes; + } + + for (j=0; j < y; ++j) { + // cur/prior filter buffers alternate + stbi_uc *cur = filter_buf + (j & 1)*img_width_bytes; + stbi_uc *prior = filter_buf + (~j & 1)*img_width_bytes; + stbi_uc *dest = a->out + stride*j; + int nk = width * filter_bytes; + int filter = *raw++; + + // check filter type + if (filter > 4) { + all_ok = stbi__err("invalid filter","Corrupt PNG"); + break; + } + + // if first row, use special filter that doesn't sample previous row + if (j == 0) filter = first_row_filter[filter]; + + // perform actual filtering + switch (filter) { + case STBI__F_none: + memcpy(cur, raw, nk); + break; + case STBI__F_sub: + memcpy(cur, raw, filter_bytes); + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); + break; + case STBI__F_up: + for (k = 0; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + prior[k]); + break; + case STBI__F_avg: + for (k = 0; k < filter_bytes; ++k) + cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); + break; + case STBI__F_paeth: + for (k = 0; k < filter_bytes; ++k) + cur[k] = STBI__BYTECAST(raw[k] + prior[k]); // prior[k] == stbi__paeth(0,prior[k],0) + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes], prior[k], prior[k-filter_bytes])); + break; + case STBI__F_avg_first: + memcpy(cur, raw, filter_bytes); + for (k = filter_bytes; k < nk; ++k) + cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); + break; + } + + raw += nk; + + // expand decoded bits in cur to dest, also adding an extra alpha channel if desired + if (depth < 8) { + stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range + stbi_uc *in = cur; + stbi_uc *out = dest; + stbi_uc inb = 0; + stbi__uint32 nsmp = x*img_n; + + // expand bits to bytes first + if (depth == 4) { + for (i=0; i < nsmp; ++i) { + if ((i & 1) == 0) inb = *in++; + *out++ = scale * (inb >> 4); + inb <<= 4; + } + } else if (depth == 2) { + for (i=0; i < nsmp; ++i) { + if ((i & 3) == 0) inb = *in++; + *out++ = scale * (inb >> 6); + inb <<= 2; + } + } else { + STBI_ASSERT(depth == 1); + for (i=0; i < nsmp; ++i) { + if ((i & 7) == 0) inb = *in++; + *out++ = scale * (inb >> 7); + inb <<= 1; + } + } + + // insert alpha=255 values if desired + if (img_n != out_n) + stbi__create_png_alpha_expand8(dest, dest, x, img_n); + } else if (depth == 8) { + if (img_n == out_n) + memcpy(dest, cur, x*img_n); + else + stbi__create_png_alpha_expand8(dest, cur, x, img_n); + } else if (depth == 16) { + // convert the image data from big-endian to platform-native + stbi__uint16 *dest16 = (stbi__uint16*)dest; + stbi__uint32 nsmp = x*img_n; + + if (img_n == out_n) { + for (i = 0; i < nsmp; ++i, ++dest16, cur += 2) + *dest16 = (cur[0] << 8) | cur[1]; + } else { + STBI_ASSERT(img_n+1 == out_n); + if (img_n == 1) { + for (i = 0; i < x; ++i, dest16 += 2, cur += 2) { + dest16[0] = (cur[0] << 8) | cur[1]; + dest16[1] = 0xffff; + } + } else { + STBI_ASSERT(img_n == 3); + for (i = 0; i < x; ++i, dest16 += 4, cur += 6) { + dest16[0] = (cur[0] << 8) | cur[1]; + dest16[1] = (cur[2] << 8) | cur[3]; + dest16[2] = (cur[4] << 8) | cur[5]; + dest16[3] = 0xffff; + } + } + } + } + } + + STBI_FREE(filter_buf); + if (!all_ok) return 0; + + return 1; +} + +static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced) +{ + int bytes = (depth == 16 ? 2 : 1); + int out_bytes = out_n * bytes; + stbi_uc *final; + int p; + if (!interlaced) + return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color); + + // de-interlacing + final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0); + if (!final) return stbi__err("outofmem", "Out of memory"); + for (p=0; p < 7; ++p) { + int xorig[] = { 0,4,0,2,0,1,0 }; + int yorig[] = { 0,0,4,0,2,0,1 }; + int xspc[] = { 8,8,4,4,2,2,1 }; + int yspc[] = { 8,8,8,4,4,2,2 }; + int i,j,x,y; + // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 + x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; + y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; + if (x && y) { + stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; + if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { + STBI_FREE(final); + return 0; + } + for (j=0; j < y; ++j) { + for (i=0; i < x; ++i) { + int out_y = j*yspc[p]+yorig[p]; + int out_x = i*xspc[p]+xorig[p]; + memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes, + a->out + (j*x+i)*out_bytes, out_bytes); + } + } + STBI_FREE(a->out); + image_data += img_len; + image_data_len -= img_len; + } + } + a->out = final; + + return 1; +} + +static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi_uc *p = z->out; + + // compute color-based transparency, assuming we've + // already got 255 as the alpha value in the output + STBI_ASSERT(out_n == 2 || out_n == 4); + + if (out_n == 2) { + for (i=0; i < pixel_count; ++i) { + p[1] = (p[0] == tc[0] ? 0 : 255); + p += 2; + } + } else { + for (i=0; i < pixel_count; ++i) { + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) + p[3] = 0; + p += 4; + } + } + return 1; +} + +static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi__uint16 *p = (stbi__uint16*) z->out; + + // compute color-based transparency, assuming we've + // already got 65535 as the alpha value in the output + STBI_ASSERT(out_n == 2 || out_n == 4); + + if (out_n == 2) { + for (i = 0; i < pixel_count; ++i) { + p[1] = (p[0] == tc[0] ? 0 : 65535); + p += 2; + } + } else { + for (i = 0; i < pixel_count; ++i) { + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) + p[3] = 0; + p += 4; + } + } + return 1; +} + +static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) +{ + stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; + stbi_uc *p, *temp_out, *orig = a->out; + + p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0); + if (p == NULL) return stbi__err("outofmem", "Out of memory"); + + // between here and free(out) below, exitting would leak + temp_out = p; + + if (pal_img_n == 3) { + for (i=0; i < pixel_count; ++i) { + int n = orig[i]*4; + p[0] = palette[n ]; + p[1] = palette[n+1]; + p[2] = palette[n+2]; + p += 3; + } + } else { + for (i=0; i < pixel_count; ++i) { + int n = orig[i]*4; + p[0] = palette[n ]; + p[1] = palette[n+1]; + p[2] = palette[n+2]; + p[3] = palette[n+3]; + p += 4; + } + } + STBI_FREE(a->out); + a->out = temp_out; + + STBI_NOTUSED(len); + + return 1; +} + +static int stbi__unpremultiply_on_load_global = 0; +static int stbi__de_iphone_flag_global = 0; + +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) +{ + stbi__unpremultiply_on_load_global = flag_true_if_should_unpremultiply; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) +{ + stbi__de_iphone_flag_global = flag_true_if_should_convert; +} + +#ifndef STBI_THREAD_LOCAL +#define stbi__unpremultiply_on_load stbi__unpremultiply_on_load_global +#define stbi__de_iphone_flag stbi__de_iphone_flag_global +#else +static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set; +static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set; + +STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply) +{ + stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply; + stbi__unpremultiply_on_load_set = 1; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert) +{ + stbi__de_iphone_flag_local = flag_true_if_should_convert; + stbi__de_iphone_flag_set = 1; +} + +#define stbi__unpremultiply_on_load (stbi__unpremultiply_on_load_set \ + ? stbi__unpremultiply_on_load_local \ + : stbi__unpremultiply_on_load_global) +#define stbi__de_iphone_flag (stbi__de_iphone_flag_set \ + ? stbi__de_iphone_flag_local \ + : stbi__de_iphone_flag_global) +#endif // STBI_THREAD_LOCAL + +static void stbi__de_iphone(stbi__png *z) +{ + stbi__context *s = z->s; + stbi__uint32 i, pixel_count = s->img_x * s->img_y; + stbi_uc *p = z->out; + + if (s->img_out_n == 3) { // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 3; + } + } else { + STBI_ASSERT(s->img_out_n == 4); + if (stbi__unpremultiply_on_load) { + // convert bgr to rgb and unpremultiply + for (i=0; i < pixel_count; ++i) { + stbi_uc a = p[3]; + stbi_uc t = p[0]; + if (a) { + stbi_uc half = a / 2; + p[0] = (p[2] * 255 + half) / a; + p[1] = (p[1] * 255 + half) / a; + p[2] = ( t * 255 + half) / a; + } else { + p[0] = p[2]; + p[2] = t; + } + p += 4; + } + } else { + // convert bgr to rgb + for (i=0; i < pixel_count; ++i) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 4; + } + } + } +} + +#define STBI__PNG_TYPE(a,b,c,d) (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d)) + +static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) +{ + stbi_uc palette[1024], pal_img_n=0; + stbi_uc has_trans=0, tc[3]={0}; + stbi__uint16 tc16[3]; + stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; + int first=1,k,interlace=0, color=0, is_iphone=0; + stbi__context *s = z->s; + + z->expanded = NULL; + z->idata = NULL; + z->out = NULL; + + if (!stbi__check_png_header(s)) return 0; + + if (scan == STBI__SCAN_type) return 1; + + for (;;) { + stbi__pngchunk c = stbi__get_chunk_header(s); + switch (c.type) { + case STBI__PNG_TYPE('C','g','B','I'): + is_iphone = 1; + stbi__skip(s, c.length); + break; + case STBI__PNG_TYPE('I','H','D','R'): { + int comp,filter; + if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); + first = 0; + if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); + s->img_x = stbi__get32be(s); + s->img_y = stbi__get32be(s); + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only"); + color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); + comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); + filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); + interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG"); + if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG"); + if (!pal_img_n) { + s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); + if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); + } else { + // if paletted, then pal_n is our final components, and + // img_n is # components to decompress/filter. + s->img_n = 1; + if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG"); + } + // even with SCAN_header, have to scan to see if we have a tRNS + break; + } + + case STBI__PNG_TYPE('P','L','T','E'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG"); + pal_len = c.length / 3; + if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG"); + for (i=0; i < pal_len; ++i) { + palette[i*4+0] = stbi__get8(s); + palette[i*4+1] = stbi__get8(s); + palette[i*4+2] = stbi__get8(s); + palette[i*4+3] = 255; + } + break; + } + + case STBI__PNG_TYPE('t','R','N','S'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG"); + if (pal_img_n) { + if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; } + if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG"); + if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG"); + pal_img_n = 4; + for (i=0; i < c.length; ++i) + palette[i*4+3] = stbi__get8(s); + } else { + if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG"); + if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG"); + has_trans = 1; + // non-paletted with tRNS = constant alpha. if header-scanning, we can stop now. + if (scan == STBI__SCAN_header) { ++s->img_n; return 1; } + if (z->depth == 16) { + for (k = 0; k < s->img_n && k < 3; ++k) // extra loop test to suppress false GCC warning + tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is + } else { + for (k = 0; k < s->img_n && k < 3; ++k) + tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger + } + } + break; + } + + case STBI__PNG_TYPE('I','D','A','T'): { + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG"); + if (scan == STBI__SCAN_header) { + // header scan definitely stops at first IDAT + if (pal_img_n) + s->img_n = pal_img_n; + return 1; + } + if (c.length > (1u << 30)) return stbi__err("IDAT size limit", "IDAT section larger than 2^30 bytes"); + if ((int)(ioff + c.length) < (int)ioff) return 0; + if (ioff + c.length > idata_limit) { + stbi__uint32 idata_limit_old = idata_limit; + stbi_uc *p; + if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; + while (ioff + c.length > idata_limit) + idata_limit *= 2; + STBI_NOTUSED(idata_limit_old); + p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory"); + z->idata = p; + } + if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG"); + ioff += c.length; + break; + } + + case STBI__PNG_TYPE('I','E','N','D'): { + stbi__uint32 raw_len, bpl; + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if (scan != STBI__SCAN_load) return 1; + if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG"); + // initial guess for decoded data size to avoid unnecessary reallocs + bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component + raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */; + z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone); + if (z->expanded == NULL) return 0; // zlib should set error + STBI_FREE(z->idata); z->idata = NULL; + if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) + s->img_out_n = s->img_n+1; + else + s->img_out_n = s->img_n; + if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0; + if (has_trans) { + if (z->depth == 16) { + if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0; + } else { + if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0; + } + } + if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2) + stbi__de_iphone(z); + if (pal_img_n) { + // pal_img_n == 3 or 4 + s->img_n = pal_img_n; // record the actual colors we had + s->img_out_n = pal_img_n; + if (req_comp >= 3) s->img_out_n = req_comp; + if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n)) + return 0; + } else if (has_trans) { + // non-paletted image with tRNS -> source image has (constant) alpha + ++s->img_n; + } + STBI_FREE(z->expanded); z->expanded = NULL; + // end of PNG chunk, read and skip CRC + stbi__get32be(s); + return 1; + } + + default: + // if critical, fail + if (first) return stbi__err("first not IHDR", "Corrupt PNG"); + if ((c.type & (1 << 29)) == 0) { + #ifndef STBI_NO_FAILURE_STRINGS + // not threadsafe + static char invalid_chunk[] = "XXXX PNG chunk not known"; + invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); + invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); + invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); + invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); + #endif + return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); + } + stbi__skip(s, c.length); + break; + } + // end of PNG chunk, read and skip CRC + stbi__get32be(s); + } +} + +static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri) +{ + void *result=NULL; + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); + if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { + if (p->depth <= 8) + ri->bits_per_channel = 8; + else if (p->depth == 16) + ri->bits_per_channel = 16; + else + return stbi__errpuc("bad bits_per_channel", "PNG not supported: unsupported color depth"); + result = p->out; + p->out = NULL; + if (req_comp && req_comp != p->s->img_out_n) { + if (ri->bits_per_channel == 8) + result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); + else + result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); + p->s->img_out_n = req_comp; + if (result == NULL) return result; + } + *x = p->s->img_x; + *y = p->s->img_y; + if (n) *n = p->s->img_n; + } + STBI_FREE(p->out); p->out = NULL; + STBI_FREE(p->expanded); p->expanded = NULL; + STBI_FREE(p->idata); p->idata = NULL; + + return result; +} + +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi__png p; + p.s = s; + return stbi__do_png(&p, x,y,comp,req_comp, ri); +} + +static int stbi__png_test(stbi__context *s) +{ + int r; + r = stbi__check_png_header(s); + stbi__rewind(s); + return r; +} + +static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) +{ + if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) { + stbi__rewind( p->s ); + return 0; + } + if (x) *x = p->s->img_x; + if (y) *y = p->s->img_y; + if (comp) *comp = p->s->img_n; + return 1; +} + +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) +{ + stbi__png p; + p.s = s; + return stbi__png_info_raw(&p, x, y, comp); +} + +static int stbi__png_is16(stbi__context *s) +{ + stbi__png p; + p.s = s; + if (!stbi__png_info_raw(&p, NULL, NULL, NULL)) + return 0; + if (p.depth != 16) { + stbi__rewind(p.s); + return 0; + } + return 1; +} +#endif + +// Microsoft/Windows BMP image + +#ifndef STBI_NO_BMP +static int stbi__bmp_test_raw(stbi__context *s) +{ + int r; + int sz; + if (stbi__get8(s) != 'B') return 0; + if (stbi__get8(s) != 'M') return 0; + stbi__get32le(s); // discard filesize + stbi__get16le(s); // discard reserved + stbi__get16le(s); // discard reserved + stbi__get32le(s); // discard data offset + sz = stbi__get32le(s); + r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); + return r; +} + +static int stbi__bmp_test(stbi__context *s) +{ + int r = stbi__bmp_test_raw(s); + stbi__rewind(s); + return r; +} + + +// returns 0..31 for the highest set bit +static int stbi__high_bit(unsigned int z) +{ + int n=0; + if (z == 0) return -1; + if (z >= 0x10000) { n += 16; z >>= 16; } + if (z >= 0x00100) { n += 8; z >>= 8; } + if (z >= 0x00010) { n += 4; z >>= 4; } + if (z >= 0x00004) { n += 2; z >>= 2; } + if (z >= 0x00002) { n += 1;/* >>= 1;*/ } + return n; +} + +static int stbi__bitcount(unsigned int a) +{ + a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 + a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 + a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits + a = (a + (a >> 8)); // max 16 per 8 bits + a = (a + (a >> 16)); // max 32 per 8 bits + return a & 0xff; +} + +// extract an arbitrarily-aligned N-bit value (N=bits) +// from v, and then make it 8-bits long and fractionally +// extend it to full full range. +static int stbi__shiftsigned(unsigned int v, int shift, int bits) +{ + static unsigned int mul_table[9] = { + 0, + 0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/, + 0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/, + }; + static unsigned int shift_table[9] = { + 0, 0,0,1,0,2,4,6,0, + }; + if (shift < 0) + v <<= -shift; + else + v >>= shift; + STBI_ASSERT(v < 256); + v >>= (8-bits); + STBI_ASSERT(bits >= 0 && bits <= 8); + return (int) ((unsigned) v * mul_table[bits]) >> shift_table[bits]; +} + +typedef struct +{ + int bpp, offset, hsz; + unsigned int mr,mg,mb,ma, all_a; + int extra_read; +} stbi__bmp_data; + +static int stbi__bmp_set_mask_defaults(stbi__bmp_data *info, int compress) +{ + // BI_BITFIELDS specifies masks explicitly, don't override + if (compress == 3) + return 1; + + if (compress == 0) { + if (info->bpp == 16) { + info->mr = 31u << 10; + info->mg = 31u << 5; + info->mb = 31u << 0; + } else if (info->bpp == 32) { + info->mr = 0xffu << 16; + info->mg = 0xffu << 8; + info->mb = 0xffu << 0; + info->ma = 0xffu << 24; + info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 + } else { + // otherwise, use defaults, which is all-0 + info->mr = info->mg = info->mb = info->ma = 0; + } + return 1; + } + return 0; // error +} + +static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) +{ + int hsz; + if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP"); + stbi__get32le(s); // discard filesize + stbi__get16le(s); // discard reserved + stbi__get16le(s); // discard reserved + info->offset = stbi__get32le(s); + info->hsz = hsz = stbi__get32le(s); + info->mr = info->mg = info->mb = info->ma = 0; + info->extra_read = 14; + + if (info->offset < 0) return stbi__errpuc("bad BMP", "bad BMP"); + + if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); + if (hsz == 12) { + s->img_x = stbi__get16le(s); + s->img_y = stbi__get16le(s); + } else { + s->img_x = stbi__get32le(s); + s->img_y = stbi__get32le(s); + } + if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP"); + info->bpp = stbi__get16le(s); + if (hsz != 12) { + int compress = stbi__get32le(s); + if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); + if (compress >= 4) return stbi__errpuc("BMP JPEG/PNG", "BMP type not supported: unsupported compression"); // this includes PNG/JPEG modes + if (compress == 3 && info->bpp != 16 && info->bpp != 32) return stbi__errpuc("bad BMP", "bad BMP"); // bitfields requires 16 or 32 bits/pixel + stbi__get32le(s); // discard sizeof + stbi__get32le(s); // discard hres + stbi__get32le(s); // discard vres + stbi__get32le(s); // discard colorsused + stbi__get32le(s); // discard max important + if (hsz == 40 || hsz == 56) { + if (hsz == 56) { + stbi__get32le(s); + stbi__get32le(s); + stbi__get32le(s); + stbi__get32le(s); + } + if (info->bpp == 16 || info->bpp == 32) { + if (compress == 0) { + stbi__bmp_set_mask_defaults(info, compress); + } else if (compress == 3) { + info->mr = stbi__get32le(s); + info->mg = stbi__get32le(s); + info->mb = stbi__get32le(s); + info->extra_read += 12; + // not documented, but generated by photoshop and handled by mspaint + if (info->mr == info->mg && info->mg == info->mb) { + // ?!?!? + return stbi__errpuc("bad BMP", "bad BMP"); + } + } else + return stbi__errpuc("bad BMP", "bad BMP"); + } + } else { + // V4/V5 header + int i; + if (hsz != 108 && hsz != 124) + return stbi__errpuc("bad BMP", "bad BMP"); + info->mr = stbi__get32le(s); + info->mg = stbi__get32le(s); + info->mb = stbi__get32le(s); + info->ma = stbi__get32le(s); + if (compress != 3) // override mr/mg/mb unless in BI_BITFIELDS mode, as per docs + stbi__bmp_set_mask_defaults(info, compress); + stbi__get32le(s); // discard color space + for (i=0; i < 12; ++i) + stbi__get32le(s); // discard color space parameters + if (hsz == 124) { + stbi__get32le(s); // discard rendering intent + stbi__get32le(s); // discard offset of profile data + stbi__get32le(s); // discard size of profile data + stbi__get32le(s); // discard reserved + } + } + } + return (void *) 1; +} + + +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *out; + unsigned int mr=0,mg=0,mb=0,ma=0, all_a; + stbi_uc pal[256][4]; + int psize=0,i,j,width; + int flip_vertically, pad, target; + stbi__bmp_data info; + STBI_NOTUSED(ri); + + info.all_a = 255; + if (stbi__bmp_parse_header(s, &info) == NULL) + return NULL; // error code already set + + flip_vertically = ((int) s->img_y) > 0; + s->img_y = abs((int) s->img_y); + + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + mr = info.mr; + mg = info.mg; + mb = info.mb; + ma = info.ma; + all_a = info.all_a; + + if (info.hsz == 12) { + if (info.bpp < 24) + psize = (info.offset - info.extra_read - 24) / 3; + } else { + if (info.bpp < 16) + psize = (info.offset - info.extra_read - info.hsz) >> 2; + } + if (psize == 0) { + // accept some number of extra bytes after the header, but if the offset points either to before + // the header ends or implies a large amount of extra data, reject the file as malformed + int bytes_read_so_far = s->callback_already_read + (int)(s->img_buffer - s->img_buffer_original); + int header_limit = 1024; // max we actually read is below 256 bytes currently. + int extra_data_limit = 256*4; // what ordinarily goes here is a palette; 256 entries*4 bytes is its max size. + if (bytes_read_so_far <= 0 || bytes_read_so_far > header_limit) { + return stbi__errpuc("bad header", "Corrupt BMP"); + } + // we established that bytes_read_so_far is positive and sensible. + // the first half of this test rejects offsets that are either too small positives, or + // negative, and guarantees that info.offset >= bytes_read_so_far > 0. this in turn + // ensures the number computed in the second half of the test can't overflow. + if (info.offset < bytes_read_so_far || info.offset - bytes_read_so_far > extra_data_limit) { + return stbi__errpuc("bad offset", "Corrupt BMP"); + } else { + stbi__skip(s, info.offset - bytes_read_so_far); + } + } + + if (info.bpp == 24 && ma == 0xff000000) + s->img_n = 3; + else + s->img_n = ma ? 4 : 3; + if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 + target = req_comp; + else + target = s->img_n; // if they want monochrome, we'll post-convert + + // sanity-check size + if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0)) + return stbi__errpuc("too large", "Corrupt BMP"); + + out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0); + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + if (info.bpp < 16) { + int z=0; + if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); } + for (i=0; i < psize; ++i) { + pal[i][2] = stbi__get8(s); + pal[i][1] = stbi__get8(s); + pal[i][0] = stbi__get8(s); + if (info.hsz != 12) stbi__get8(s); + pal[i][3] = 255; + } + stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); + if (info.bpp == 1) width = (s->img_x + 7) >> 3; + else if (info.bpp == 4) width = (s->img_x + 1) >> 1; + else if (info.bpp == 8) width = s->img_x; + else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); } + pad = (-width)&3; + if (info.bpp == 1) { + for (j=0; j < (int) s->img_y; ++j) { + int bit_offset = 7, v = stbi__get8(s); + for (i=0; i < (int) s->img_x; ++i) { + int color = (v>>bit_offset)&0x1; + out[z++] = pal[color][0]; + out[z++] = pal[color][1]; + out[z++] = pal[color][2]; + if (target == 4) out[z++] = 255; + if (i+1 == (int) s->img_x) break; + if((--bit_offset) < 0) { + bit_offset = 7; + v = stbi__get8(s); + } + } + stbi__skip(s, pad); + } + } else { + for (j=0; j < (int) s->img_y; ++j) { + for (i=0; i < (int) s->img_x; i += 2) { + int v=stbi__get8(s),v2=0; + if (info.bpp == 4) { + v2 = v & 15; + v >>= 4; + } + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + if (i+1 == (int) s->img_x) break; + v = (info.bpp == 8) ? stbi__get8(s) : v2; + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + } + stbi__skip(s, pad); + } + } + } else { + int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; + int z = 0; + int easy=0; + stbi__skip(s, info.offset - info.extra_read - info.hsz); + if (info.bpp == 24) width = 3 * s->img_x; + else if (info.bpp == 16) width = 2*s->img_x; + else /* bpp = 32 and pad = 0 */ width=0; + pad = (-width) & 3; + if (info.bpp == 24) { + easy = 1; + } else if (info.bpp == 32) { + if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) + easy = 2; + } + if (!easy) { + if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } + // right shift amt to put high bit in position #7 + rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr); + gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg); + bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb); + ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma); + if (rcount > 8 || gcount > 8 || bcount > 8 || acount > 8) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } + } + for (j=0; j < (int) s->img_y; ++j) { + if (easy) { + for (i=0; i < (int) s->img_x; ++i) { + unsigned char a; + out[z+2] = stbi__get8(s); + out[z+1] = stbi__get8(s); + out[z+0] = stbi__get8(s); + z += 3; + a = (easy == 2 ? stbi__get8(s) : 255); + all_a |= a; + if (target == 4) out[z++] = a; + } + } else { + int bpp = info.bpp; + for (i=0; i < (int) s->img_x; ++i) { + stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s)); + unsigned int a; + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount)); + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount)); + out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount)); + a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255); + all_a |= a; + if (target == 4) out[z++] = STBI__BYTECAST(a); + } + } + stbi__skip(s, pad); + } + } + + // if alpha channel is all 0s, replace with all 255s + if (target == 4 && all_a == 0) + for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) + out[i] = 255; + + if (flip_vertically) { + stbi_uc t; + for (j=0; j < (int) s->img_y>>1; ++j) { + stbi_uc *p1 = out + j *s->img_x*target; + stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; + for (i=0; i < (int) s->img_x*target; ++i) { + t = p1[i]; p1[i] = p2[i]; p2[i] = t; + } + } + } + + if (req_comp && req_comp != target) { + out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + + *x = s->img_x; + *y = s->img_y; + if (comp) *comp = s->img_n; + return out; +} +#endif + +// Targa Truevision - TGA +// by Jonathan Dummer +#ifndef STBI_NO_TGA +// returns STBI_rgb or whatever, 0 on error +static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) +{ + // only RGB or RGBA (incl. 16bit) or grey allowed + if (is_rgb16) *is_rgb16 = 0; + switch(bits_per_pixel) { + case 8: return STBI_grey; + case 16: if(is_grey) return STBI_grey_alpha; + // fallthrough + case 15: if(is_rgb16) *is_rgb16 = 1; + return STBI_rgb; + case 24: // fallthrough + case 32: return bits_per_pixel/8; + default: return 0; + } +} + +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) +{ + int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; + int sz, tga_colormap_type; + stbi__get8(s); // discard Offset + tga_colormap_type = stbi__get8(s); // colormap type + if( tga_colormap_type > 1 ) { + stbi__rewind(s); + return 0; // only RGB or indexed allowed + } + tga_image_type = stbi__get8(s); // image type + if ( tga_colormap_type == 1 ) { // colormapped (paletted) image + if (tga_image_type != 1 && tga_image_type != 9) { + stbi__rewind(s); + return 0; + } + stbi__skip(s,4); // skip index of first colormap entry and number of entries + sz = stbi__get8(s); // check bits per palette color entry + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) { + stbi__rewind(s); + return 0; + } + stbi__skip(s,4); // skip image x and y origin + tga_colormap_bpp = sz; + } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE + if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) { + stbi__rewind(s); + return 0; // only RGB or grey allowed, +/- RLE + } + stbi__skip(s,9); // skip colormap specification and image x/y origin + tga_colormap_bpp = 0; + } + tga_w = stbi__get16le(s); + if( tga_w < 1 ) { + stbi__rewind(s); + return 0; // test width + } + tga_h = stbi__get16le(s); + if( tga_h < 1 ) { + stbi__rewind(s); + return 0; // test height + } + tga_bits_per_pixel = stbi__get8(s); // bits per pixel + stbi__get8(s); // ignore alpha bits + if (tga_colormap_bpp != 0) { + if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) { + // when using a colormap, tga_bits_per_pixel is the size of the indexes + // I don't think anything but 8 or 16bit indexes makes sense + stbi__rewind(s); + return 0; + } + tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL); + } else { + tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL); + } + if(!tga_comp) { + stbi__rewind(s); + return 0; + } + if (x) *x = tga_w; + if (y) *y = tga_h; + if (comp) *comp = tga_comp; + return 1; // seems to have passed everything +} + +static int stbi__tga_test(stbi__context *s) +{ + int res = 0; + int sz, tga_color_type; + stbi__get8(s); // discard Offset + tga_color_type = stbi__get8(s); // color type + if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed + sz = stbi__get8(s); // image type + if ( tga_color_type == 1 ) { // colormapped (paletted) image + if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9 + stbi__skip(s,4); // skip index of first colormap entry and number of entries + sz = stbi__get8(s); // check bits per palette color entry + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + stbi__skip(s,4); // skip image x and y origin + } else { // "normal" image w/o colormap + if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE + stbi__skip(s,9); // skip colormap specification and image x/y origin + } + if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width + if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height + sz = stbi__get8(s); // bits per pixel + if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index + if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + + res = 1; // if we got this far, everything's good and we can return 1 instead of 0 + +errorEnd: + stbi__rewind(s); + return res; +} + +// read 16bit value and convert to 24bit RGB +static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out) +{ + stbi__uint16 px = (stbi__uint16)stbi__get16le(s); + stbi__uint16 fiveBitMask = 31; + // we have 3 channels with 5bits each + int r = (px >> 10) & fiveBitMask; + int g = (px >> 5) & fiveBitMask; + int b = px & fiveBitMask; + // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later + out[0] = (stbi_uc)((r * 255)/31); + out[1] = (stbi_uc)((g * 255)/31); + out[2] = (stbi_uc)((b * 255)/31); + + // some people claim that the most significant bit might be used for alpha + // (possibly if an alpha-bit is set in the "image descriptor byte") + // but that only made 16bit test images completely translucent.. + // so let's treat all 15 and 16bit TGAs as RGB with no alpha. +} + +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + // read in the TGA header stuff + int tga_offset = stbi__get8(s); + int tga_indexed = stbi__get8(s); + int tga_image_type = stbi__get8(s); + int tga_is_RLE = 0; + int tga_palette_start = stbi__get16le(s); + int tga_palette_len = stbi__get16le(s); + int tga_palette_bits = stbi__get8(s); + int tga_x_origin = stbi__get16le(s); + int tga_y_origin = stbi__get16le(s); + int tga_width = stbi__get16le(s); + int tga_height = stbi__get16le(s); + int tga_bits_per_pixel = stbi__get8(s); + int tga_comp, tga_rgb16=0; + int tga_inverted = stbi__get8(s); + // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) + // image data + unsigned char *tga_data; + unsigned char *tga_palette = NULL; + int i, j; + unsigned char raw_data[4] = {0}; + int RLE_count = 0; + int RLE_repeating = 0; + int read_next_pixel = 1; + STBI_NOTUSED(ri); + STBI_NOTUSED(tga_x_origin); // @TODO + STBI_NOTUSED(tga_y_origin); // @TODO + + if (tga_height > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (tga_width > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + // do a tiny bit of precessing + if ( tga_image_type >= 8 ) + { + tga_image_type -= 8; + tga_is_RLE = 1; + } + tga_inverted = 1 - ((tga_inverted >> 5) & 1); + + // If I'm paletted, then I'll use the number of bits from the palette + if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16); + else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16); + + if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency + return stbi__errpuc("bad format", "Can't find out TGA pixelformat"); + + // tga info + *x = tga_width; + *y = tga_height; + if (comp) *comp = tga_comp; + + if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0)) + return stbi__errpuc("too large", "Corrupt TGA"); + + tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0); + if (!tga_data) return stbi__errpuc("outofmem", "Out of memory"); + + // skip to the data's starting position (offset usually = 0) + stbi__skip(s, tga_offset ); + + if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) { + for (i=0; i < tga_height; ++i) { + int row = tga_inverted ? tga_height -i - 1 : i; + stbi_uc *tga_row = tga_data + row*tga_width*tga_comp; + stbi__getn(s, tga_row, tga_width * tga_comp); + } + } else { + // do I need to load a palette? + if ( tga_indexed) + { + if (tga_palette_len == 0) { /* you have to have at least one entry! */ + STBI_FREE(tga_data); + return stbi__errpuc("bad palette", "Corrupt TGA"); + } + + // any data to skip? (offset usually = 0) + stbi__skip(s, tga_palette_start ); + // load the palette + tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0); + if (!tga_palette) { + STBI_FREE(tga_data); + return stbi__errpuc("outofmem", "Out of memory"); + } + if (tga_rgb16) { + stbi_uc *pal_entry = tga_palette; + STBI_ASSERT(tga_comp == STBI_rgb); + for (i=0; i < tga_palette_len; ++i) { + stbi__tga_read_rgb16(s, pal_entry); + pal_entry += tga_comp; + } + } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) { + STBI_FREE(tga_data); + STBI_FREE(tga_palette); + return stbi__errpuc("bad palette", "Corrupt TGA"); + } + } + // load the data + for (i=0; i < tga_width * tga_height; ++i) + { + // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk? + if ( tga_is_RLE ) + { + if ( RLE_count == 0 ) + { + // yep, get the next byte as a RLE command + int RLE_cmd = stbi__get8(s); + RLE_count = 1 + (RLE_cmd & 127); + RLE_repeating = RLE_cmd >> 7; + read_next_pixel = 1; + } else if ( !RLE_repeating ) + { + read_next_pixel = 1; + } + } else + { + read_next_pixel = 1; + } + // OK, if I need to read a pixel, do it now + if ( read_next_pixel ) + { + // load however much data we did have + if ( tga_indexed ) + { + // read in index, then perform the lookup + int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s); + if ( pal_idx >= tga_palette_len ) { + // invalid index + pal_idx = 0; + } + pal_idx *= tga_comp; + for (j = 0; j < tga_comp; ++j) { + raw_data[j] = tga_palette[pal_idx+j]; + } + } else if(tga_rgb16) { + STBI_ASSERT(tga_comp == STBI_rgb); + stbi__tga_read_rgb16(s, raw_data); + } else { + // read in the data raw + for (j = 0; j < tga_comp; ++j) { + raw_data[j] = stbi__get8(s); + } + } + // clear the reading flag for the next pixel + read_next_pixel = 0; + } // end of reading a pixel + + // copy data + for (j = 0; j < tga_comp; ++j) + tga_data[i*tga_comp+j] = raw_data[j]; + + // in case we're in RLE mode, keep counting down + --RLE_count; + } + // do I need to invert the image? + if ( tga_inverted ) + { + for (j = 0; j*2 < tga_height; ++j) + { + int index1 = j * tga_width * tga_comp; + int index2 = (tga_height - 1 - j) * tga_width * tga_comp; + for (i = tga_width * tga_comp; i > 0; --i) + { + unsigned char temp = tga_data[index1]; + tga_data[index1] = tga_data[index2]; + tga_data[index2] = temp; + ++index1; + ++index2; + } + } + } + // clear my palette, if I had one + if ( tga_palette != NULL ) + { + STBI_FREE( tga_palette ); + } + } + + // swap RGB - if the source data was RGB16, it already is in the right order + if (tga_comp >= 3 && !tga_rgb16) + { + unsigned char* tga_pixel = tga_data; + for (i=0; i < tga_width * tga_height; ++i) + { + unsigned char temp = tga_pixel[0]; + tga_pixel[0] = tga_pixel[2]; + tga_pixel[2] = temp; + tga_pixel += tga_comp; + } + } + + // convert to target component count + if (req_comp && req_comp != tga_comp) + tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); + + // the things I do to get rid of an error message, and yet keep + // Microsoft's C compilers happy... [8^( + tga_palette_start = tga_palette_len = tga_palette_bits = + tga_x_origin = tga_y_origin = 0; + STBI_NOTUSED(tga_palette_start); + // OK, done + return tga_data; +} +#endif + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s) +{ + int r = (stbi__get32be(s) == 0x38425053); + stbi__rewind(s); + return r; +} + +static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount) +{ + int count, nleft, len; + + count = 0; + while ((nleft = pixelCount - count) > 0) { + len = stbi__get8(s); + if (len == 128) { + // No-op. + } else if (len < 128) { + // Copy next len+1 bytes literally. + len++; + if (len > nleft) return 0; // corrupt data + count += len; + while (len) { + *p = stbi__get8(s); + p += 4; + len--; + } + } else if (len > 128) { + stbi_uc val; + // Next -len+1 bytes in the dest are replicated from next source byte. + // (Interpret len as a negative 8-bit int.) + len = 257 - len; + if (len > nleft) return 0; // corrupt data + val = stbi__get8(s); + count += len; + while (len) { + *p = val; + p += 4; + len--; + } + } + } + + return 1; +} + +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ + int pixelCount; + int channelCount, compression; + int channel, i; + int bitdepth; + int w,h; + stbi_uc *out; + STBI_NOTUSED(ri); + + // Check identifier + if (stbi__get32be(s) != 0x38425053) // "8BPS" + return stbi__errpuc("not PSD", "Corrupt PSD image"); + + // Check file type version. + if (stbi__get16be(s) != 1) + return stbi__errpuc("wrong version", "Unsupported version of PSD image"); + + // Skip 6 reserved bytes. + stbi__skip(s, 6 ); + + // Read the number of channels (R, G, B, A, etc). + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) + return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); + + // Read the rows and columns of the image. + h = stbi__get32be(s); + w = stbi__get32be(s); + + if (h > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (w > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + // Make sure the depth is 8 bits. + bitdepth = stbi__get16be(s); + if (bitdepth != 8 && bitdepth != 16) + return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit"); + + // Make sure the color mode is RGB. + // Valid options are: + // 0: Bitmap + // 1: Grayscale + // 2: Indexed color + // 3: RGB color + // 4: CMYK color + // 7: Multichannel + // 8: Duotone + // 9: Lab color + if (stbi__get16be(s) != 3) + return stbi__errpuc("wrong color format", "PSD is not in RGB color format"); + + // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) + stbi__skip(s,stbi__get32be(s) ); + + // Skip the image resources. (resolution, pen tool paths, etc) + stbi__skip(s, stbi__get32be(s) ); + + // Skip the reserved data. + stbi__skip(s, stbi__get32be(s) ); + + // Find out if the data is compressed. + // Known values: + // 0: no compression + // 1: RLE compressed + compression = stbi__get16be(s); + if (compression > 1) + return stbi__errpuc("bad compression", "PSD has an unknown compression format"); + + // Check size + if (!stbi__mad3sizes_valid(4, w, h, 0)) + return stbi__errpuc("too large", "Corrupt PSD"); + + // Create the destination image. + + if (!compression && bitdepth == 16 && bpc == 16) { + out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0); + ri->bits_per_channel = 16; + } else + out = (stbi_uc *) stbi__malloc(4 * w*h); + + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + pixelCount = w*h; + + // Initialize the data to zero. + //memset( out, 0, pixelCount * 4 ); + + // Finally, the image data. + if (compression) { + // RLE as used by .PSD and .TIFF + // Loop until you get the number of unpacked bytes you are expecting: + // Read the next source byte into n. + // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. + // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. + // Else if n is 128, noop. + // Endloop + + // The RLE-compressed data is preceded by a 2-byte data count for each row in the data, + // which we're going to just skip. + stbi__skip(s, h * channelCount * 2 ); + + // Read the RLE data by channel. + for (channel = 0; channel < 4; channel++) { + stbi_uc *p; + + p = out+channel; + if (channel >= channelCount) { + // Fill this channel with default data. + for (i = 0; i < pixelCount; i++, p += 4) + *p = (channel == 3 ? 255 : 0); + } else { + // Read the RLE data. + if (!stbi__psd_decode_rle(s, p, pixelCount)) { + STBI_FREE(out); + return stbi__errpuc("corrupt", "bad RLE data"); + } + } + } + + } else { + // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) + // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image. + + // Read the data by channel. + for (channel = 0; channel < 4; channel++) { + if (channel >= channelCount) { + // Fill this channel with default data. + if (bitdepth == 16 && bpc == 16) { + stbi__uint16 *q = ((stbi__uint16 *) out) + channel; + stbi__uint16 val = channel == 3 ? 65535 : 0; + for (i = 0; i < pixelCount; i++, q += 4) + *q = val; + } else { + stbi_uc *p = out+channel; + stbi_uc val = channel == 3 ? 255 : 0; + for (i = 0; i < pixelCount; i++, p += 4) + *p = val; + } + } else { + if (ri->bits_per_channel == 16) { // output bpc + stbi__uint16 *q = ((stbi__uint16 *) out) + channel; + for (i = 0; i < pixelCount; i++, q += 4) + *q = (stbi__uint16) stbi__get16be(s); + } else { + stbi_uc *p = out+channel; + if (bitdepth == 16) { // input bpc + for (i = 0; i < pixelCount; i++, p += 4) + *p = (stbi_uc) (stbi__get16be(s) >> 8); + } else { + for (i = 0; i < pixelCount; i++, p += 4) + *p = stbi__get8(s); + } + } + } + } + } + + // remove weird white matte from PSD + if (channelCount >= 4) { + if (ri->bits_per_channel == 16) { + for (i=0; i < w*h; ++i) { + stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i; + if (pixel[3] != 0 && pixel[3] != 65535) { + float a = pixel[3] / 65535.0f; + float ra = 1.0f / a; + float inv_a = 65535.0f * (1 - ra); + pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a); + pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a); + pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a); + } + } + } else { + for (i=0; i < w*h; ++i) { + unsigned char *pixel = out + 4*i; + if (pixel[3] != 0 && pixel[3] != 255) { + float a = pixel[3] / 255.0f; + float ra = 1.0f / a; + float inv_a = 255.0f * (1 - ra); + pixel[0] = (unsigned char) (pixel[0]*ra + inv_a); + pixel[1] = (unsigned char) (pixel[1]*ra + inv_a); + pixel[2] = (unsigned char) (pixel[2]*ra + inv_a); + } + } + } + } + + // convert to desired output format + if (req_comp && req_comp != 4) { + if (ri->bits_per_channel == 16) + out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h); + else + out = stbi__convert_format(out, 4, req_comp, w, h); + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + + if (comp) *comp = 4; + *y = h; + *x = w; + + return out; +} +#endif + +// ************************************************************************************************* +// Softimage PIC loader +// by Tom Seddon +// +// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format +// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ + +#ifndef STBI_NO_PIC +static int stbi__pic_is4(stbi__context *s,const char *str) +{ + int i; + for (i=0; i<4; ++i) + if (stbi__get8(s) != (stbi_uc)str[i]) + return 0; + + return 1; +} + +static int stbi__pic_test_core(stbi__context *s) +{ + int i; + + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) + return 0; + + for(i=0;i<84;++i) + stbi__get8(s); + + if (!stbi__pic_is4(s,"PICT")) + return 0; + + return 1; +} + +typedef struct +{ + stbi_uc size,type,channel; +} stbi__pic_packet; + +static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest) +{ + int mask=0x80, i; + + for (i=0; i<4; ++i, mask>>=1) { + if (channel & mask) { + if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short"); + dest[i]=stbi__get8(s); + } + } + + return dest; +} + +static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src) +{ + int mask=0x80,i; + + for (i=0;i<4; ++i, mask>>=1) + if (channel&mask) + dest[i]=src[i]; +} + +static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result) +{ + int act_comp=0,num_packets=0,y,chained; + stbi__pic_packet packets[10]; + + // this will (should...) cater for even some bizarre stuff like having data + // for the same channel in multiple packets. + do { + stbi__pic_packet *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return stbi__errpuc("bad format","too many packets"); + + packet = &packets[num_packets++]; + + chained = stbi__get8(s); + packet->size = stbi__get8(s); + packet->type = stbi__get8(s); + packet->channel = stbi__get8(s); + + act_comp |= packet->channel; + + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)"); + if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp"); + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? + + for(y=0; y<height; ++y) { + int packet_idx; + + for(packet_idx=0; packet_idx < num_packets; ++packet_idx) { + stbi__pic_packet *packet = &packets[packet_idx]; + stbi_uc *dest = result+y*width*4; + + switch (packet->type) { + default: + return stbi__errpuc("bad format","packet has bad compression type"); + + case 0: {//uncompressed + int x; + + for(x=0;x<width;++x, dest+=4) + if (!stbi__readval(s,packet->channel,dest)) + return 0; + break; + } + + case 1://Pure RLE + { + int left=width, i; + + while (left>0) { + stbi_uc count,value[4]; + + count=stbi__get8(s); + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); + + if (count > left) + count = (stbi_uc) left; + + if (!stbi__readval(s,packet->channel,value)) return 0; + + for(i=0; i<count; ++i,dest+=4) + stbi__copyval(packet->channel,dest,value); + left -= count; + } + } + break; + + case 2: {//Mixed RLE + int left=width; + while (left>0) { + int count = stbi__get8(s), i; + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); + + if (count >= 128) { // Repeated + stbi_uc value[4]; + + if (count==128) + count = stbi__get16be(s); + else + count -= 127; + if (count > left) + return stbi__errpuc("bad file","scanline overrun"); + + if (!stbi__readval(s,packet->channel,value)) + return 0; + + for(i=0;i<count;++i, dest += 4) + stbi__copyval(packet->channel,dest,value); + } else { // Raw + ++count; + if (count>left) return stbi__errpuc("bad file","scanline overrun"); + + for(i=0;i<count;++i, dest+=4) + if (!stbi__readval(s,packet->channel,dest)) + return 0; + } + left-=count; + } + break; + } + } + } + } + + return result; +} + +static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri) +{ + stbi_uc *result; + int i, x,y, internal_comp; + STBI_NOTUSED(ri); + + if (!comp) comp = &internal_comp; + + for (i=0; i<92; ++i) + stbi__get8(s); + + x = stbi__get16be(s); + y = stbi__get16be(s); + + if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); + if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode"); + + stbi__get32be(s); //skip `ratio' + stbi__get16be(s); //skip `fields' + stbi__get16be(s); //skip `pad' + + // intermediate buffer is RGBA + result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0); + if (!result) return stbi__errpuc("outofmem", "Out of memory"); + memset(result, 0xff, x*y*4); + + if (!stbi__pic_load_core(s,x,y,comp, result)) { + STBI_FREE(result); + result=0; + } + *px = x; + *py = y; + if (req_comp == 0) req_comp = *comp; + result=stbi__convert_format(result,4,req_comp,x,y); + + return result; +} + +static int stbi__pic_test(stbi__context *s) +{ + int r = stbi__pic_test_core(s); + stbi__rewind(s); + return r; +} +#endif + +// ************************************************************************************************* +// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb + +#ifndef STBI_NO_GIF +typedef struct +{ + stbi__int16 prefix; + stbi_uc first; + stbi_uc suffix; +} stbi__gif_lzw; + +typedef struct +{ + int w,h; + stbi_uc *out; // output buffer (always 4 components) + stbi_uc *background; // The current "background" as far as a gif is concerned + stbi_uc *history; + int flags, bgindex, ratio, transparent, eflags; + stbi_uc pal[256][4]; + stbi_uc lpal[256][4]; + stbi__gif_lzw codes[8192]; + stbi_uc *color_table; + int parse, step; + int lflags; + int start_x, start_y; + int max_x, max_y; + int cur_x, cur_y; + int line_size; + int delay; +} stbi__gif; + +static int stbi__gif_test_raw(stbi__context *s) +{ + int sz; + if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0; + sz = stbi__get8(s); + if (sz != '9' && sz != '7') return 0; + if (stbi__get8(s) != 'a') return 0; + return 1; +} + +static int stbi__gif_test(stbi__context *s) +{ + int r = stbi__gif_test_raw(s); + stbi__rewind(s); + return r; +} + +static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp) +{ + int i; + for (i=0; i < num_entries; ++i) { + pal[i][2] = stbi__get8(s); + pal[i][1] = stbi__get8(s); + pal[i][0] = stbi__get8(s); + pal[i][3] = transp == i ? 0 : 255; + } +} + +static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) +{ + stbi_uc version; + if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') + return stbi__err("not GIF", "Corrupt GIF"); + + version = stbi__get8(s); + if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF"); + if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF"); + + stbi__g_failure_reason = ""; + g->w = stbi__get16le(s); + g->h = stbi__get16le(s); + g->flags = stbi__get8(s); + g->bgindex = stbi__get8(s); + g->ratio = stbi__get8(s); + g->transparent = -1; + + if (g->w > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + if (g->h > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + + if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments + + if (is_info) return 1; + + if (g->flags & 0x80) + stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); + + return 1; +} + +static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) +{ + stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif)); + if (!g) return stbi__err("outofmem", "Out of memory"); + if (!stbi__gif_header(s, g, comp, 1)) { + STBI_FREE(g); + stbi__rewind( s ); + return 0; + } + if (x) *x = g->w; + if (y) *y = g->h; + STBI_FREE(g); + return 1; +} + +static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code) +{ + stbi_uc *p, *c; + int idx; + + // recurse to decode the prefixes, since the linked-list is backwards, + // and working backwards through an interleaved image would be nasty + if (g->codes[code].prefix >= 0) + stbi__out_gif_code(g, g->codes[code].prefix); + + if (g->cur_y >= g->max_y) return; + + idx = g->cur_x + g->cur_y; + p = &g->out[idx]; + g->history[idx / 4] = 1; + + c = &g->color_table[g->codes[code].suffix * 4]; + if (c[3] > 128) { // don't render transparent pixels; + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = c[3]; + } + g->cur_x += 4; + + if (g->cur_x >= g->max_x) { + g->cur_x = g->start_x; + g->cur_y += g->step; + + while (g->cur_y >= g->max_y && g->parse > 0) { + g->step = (1 << g->parse) * g->line_size; + g->cur_y = g->start_y + (g->step >> 1); + --g->parse; + } + } +} + +static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) +{ + stbi_uc lzw_cs; + stbi__int32 len, init_code; + stbi__uint32 first; + stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; + stbi__gif_lzw *p; + + lzw_cs = stbi__get8(s); + if (lzw_cs > 12) return NULL; + clear = 1 << lzw_cs; + first = 1; + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + bits = 0; + valid_bits = 0; + for (init_code = 0; init_code < clear; init_code++) { + g->codes[init_code].prefix = -1; + g->codes[init_code].first = (stbi_uc) init_code; + g->codes[init_code].suffix = (stbi_uc) init_code; + } + + // support no starting clear code + avail = clear+2; + oldcode = -1; + + len = 0; + for(;;) { + if (valid_bits < codesize) { + if (len == 0) { + len = stbi__get8(s); // start new block + if (len == 0) + return g->out; + } + --len; + bits |= (stbi__int32) stbi__get8(s) << valid_bits; + valid_bits += 8; + } else { + stbi__int32 code = bits & codemask; + bits >>= codesize; + valid_bits -= codesize; + // @OPTIMIZE: is there some way we can accelerate the non-clear path? + if (code == clear) { // clear code + codesize = lzw_cs + 1; + codemask = (1 << codesize) - 1; + avail = clear + 2; + oldcode = -1; + first = 0; + } else if (code == clear + 1) { // end of stream code + stbi__skip(s, len); + while ((len = stbi__get8(s)) > 0) + stbi__skip(s,len); + return g->out; + } else if (code <= avail) { + if (first) { + return stbi__errpuc("no clear code", "Corrupt GIF"); + } + + if (oldcode >= 0) { + p = &g->codes[avail++]; + if (avail > 8192) { + return stbi__errpuc("too many codes", "Corrupt GIF"); + } + + p->prefix = (stbi__int16) oldcode; + p->first = g->codes[oldcode].first; + p->suffix = (code == avail) ? p->first : g->codes[code].first; + } else if (code == avail) + return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + + stbi__out_gif_code(g, (stbi__uint16) code); + + if ((avail & codemask) == 0 && avail <= 0x0FFF) { + codesize++; + codemask = (1 << codesize) - 1; + } + + oldcode = code; + } else { + return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + } + } + } +} + +// this function is designed to support animated gifs, although stb_image doesn't support it +// two back is the image from two frames ago, used for a very specific disposal format +static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp, stbi_uc *two_back) +{ + int dispose; + int first_frame; + int pi; + int pcount; + STBI_NOTUSED(req_comp); + + // on first frame, any non-written pixels get the background colour (non-transparent) + first_frame = 0; + if (g->out == 0) { + if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header + if (!stbi__mad3sizes_valid(4, g->w, g->h, 0)) + return stbi__errpuc("too large", "GIF image is too large"); + pcount = g->w * g->h; + g->out = (stbi_uc *) stbi__malloc(4 * pcount); + g->background = (stbi_uc *) stbi__malloc(4 * pcount); + g->history = (stbi_uc *) stbi__malloc(pcount); + if (!g->out || !g->background || !g->history) + return stbi__errpuc("outofmem", "Out of memory"); + + // image is treated as "transparent" at the start - ie, nothing overwrites the current background; + // background colour is only used for pixels that are not rendered first frame, after that "background" + // color refers to the color that was there the previous frame. + memset(g->out, 0x00, 4 * pcount); + memset(g->background, 0x00, 4 * pcount); // state of the background (starts transparent) + memset(g->history, 0x00, pcount); // pixels that were affected previous frame + first_frame = 1; + } else { + // second frame - how do we dispose of the previous one? + dispose = (g->eflags & 0x1C) >> 2; + pcount = g->w * g->h; + + if ((dispose == 3) && (two_back == 0)) { + dispose = 2; // if I don't have an image to revert back to, default to the old background + } + + if (dispose == 3) { // use previous graphic + for (pi = 0; pi < pcount; ++pi) { + if (g->history[pi]) { + memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 ); + } + } + } else if (dispose == 2) { + // restore what was changed last frame to background before that frame; + for (pi = 0; pi < pcount; ++pi) { + if (g->history[pi]) { + memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 ); + } + } + } else { + // This is a non-disposal case eithe way, so just + // leave the pixels as is, and they will become the new background + // 1: do not dispose + // 0: not specified. + } + + // background is what out is after the undoing of the previou frame; + memcpy( g->background, g->out, 4 * g->w * g->h ); + } + + // clear my history; + memset( g->history, 0x00, g->w * g->h ); // pixels that were affected previous frame + + for (;;) { + int tag = stbi__get8(s); + switch (tag) { + case 0x2C: /* Image Descriptor */ + { + stbi__int32 x, y, w, h; + stbi_uc *o; + + x = stbi__get16le(s); + y = stbi__get16le(s); + w = stbi__get16le(s); + h = stbi__get16le(s); + if (((x + w) > (g->w)) || ((y + h) > (g->h))) + return stbi__errpuc("bad Image Descriptor", "Corrupt GIF"); + + g->line_size = g->w * 4; + g->start_x = x * 4; + g->start_y = y * g->line_size; + g->max_x = g->start_x + w * 4; + g->max_y = g->start_y + h * g->line_size; + g->cur_x = g->start_x; + g->cur_y = g->start_y; + + // if the width of the specified rectangle is 0, that means + // we may not see *any* pixels or the image is malformed; + // to make sure this is caught, move the current y down to + // max_y (which is what out_gif_code checks). + if (w == 0) + g->cur_y = g->max_y; + + g->lflags = stbi__get8(s); + + if (g->lflags & 0x40) { + g->step = 8 * g->line_size; // first interlaced spacing + g->parse = 3; + } else { + g->step = g->line_size; + g->parse = 0; + } + + if (g->lflags & 0x80) { + stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); + g->color_table = (stbi_uc *) g->lpal; + } else if (g->flags & 0x80) { + g->color_table = (stbi_uc *) g->pal; + } else + return stbi__errpuc("missing color table", "Corrupt GIF"); + + o = stbi__process_gif_raster(s, g); + if (!o) return NULL; + + // if this was the first frame, + pcount = g->w * g->h; + if (first_frame && (g->bgindex > 0)) { + // if first frame, any pixel not drawn to gets the background color + for (pi = 0; pi < pcount; ++pi) { + if (g->history[pi] == 0) { + g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be; + memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 ); + } + } + } + + return o; + } + + case 0x21: // Comment Extension. + { + int len; + int ext = stbi__get8(s); + if (ext == 0xF9) { // Graphic Control Extension. + len = stbi__get8(s); + if (len == 4) { + g->eflags = stbi__get8(s); + g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second, saving as 1/1000ths. + + // unset old transparent + if (g->transparent >= 0) { + g->pal[g->transparent][3] = 255; + } + if (g->eflags & 0x01) { + g->transparent = stbi__get8(s); + if (g->transparent >= 0) { + g->pal[g->transparent][3] = 0; + } + } else { + // don't need transparent + stbi__skip(s, 1); + g->transparent = -1; + } + } else { + stbi__skip(s, len); + break; + } + } + while ((len = stbi__get8(s)) != 0) { + stbi__skip(s, len); + } + break; + } + + case 0x3B: // gif stream termination code + return (stbi_uc *) s; // using '1' causes warning on some compilers + + default: + return stbi__errpuc("unknown code", "Corrupt GIF"); + } + } +} + +static void *stbi__load_gif_main_outofmem(stbi__gif *g, stbi_uc *out, int **delays) +{ + STBI_FREE(g->out); + STBI_FREE(g->history); + STBI_FREE(g->background); + + if (out) STBI_FREE(out); + if (delays && *delays) STBI_FREE(*delays); + return stbi__errpuc("outofmem", "Out of memory"); +} + +static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp) +{ + if (stbi__gif_test(s)) { + int layers = 0; + stbi_uc *u = 0; + stbi_uc *out = 0; + stbi_uc *two_back = 0; + stbi__gif g; + int stride; + int out_size = 0; + int delays_size = 0; + + STBI_NOTUSED(out_size); + STBI_NOTUSED(delays_size); + + memset(&g, 0, sizeof(g)); + if (delays) { + *delays = 0; + } + + do { + u = stbi__gif_load_next(s, &g, comp, req_comp, two_back); + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker + + if (u) { + *x = g.w; + *y = g.h; + ++layers; + stride = g.w * g.h * 4; + + if (out) { + void *tmp = (stbi_uc*) STBI_REALLOC_SIZED( out, out_size, layers * stride ); + if (!tmp) + return stbi__load_gif_main_outofmem(&g, out, delays); + else { + out = (stbi_uc*) tmp; + out_size = layers * stride; + } + + if (delays) { + int *new_delays = (int*) STBI_REALLOC_SIZED( *delays, delays_size, sizeof(int) * layers ); + if (!new_delays) + return stbi__load_gif_main_outofmem(&g, out, delays); + *delays = new_delays; + delays_size = layers * sizeof(int); + } + } else { + out = (stbi_uc*)stbi__malloc( layers * stride ); + if (!out) + return stbi__load_gif_main_outofmem(&g, out, delays); + out_size = layers * stride; + if (delays) { + *delays = (int*) stbi__malloc( layers * sizeof(int) ); + if (!*delays) + return stbi__load_gif_main_outofmem(&g, out, delays); + delays_size = layers * sizeof(int); + } + } + memcpy( out + ((layers - 1) * stride), u, stride ); + if (layers >= 2) { + two_back = out - 2 * stride; + } + + if (delays) { + (*delays)[layers - 1U] = g.delay; + } + } + } while (u != 0); + + // free temp buffer; + STBI_FREE(g.out); + STBI_FREE(g.history); + STBI_FREE(g.background); + + // do the final conversion after loading everything; + if (req_comp && req_comp != 4) + out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h); + + *z = layers; + return out; + } else { + return stbi__errpuc("not GIF", "Image was not as a gif type."); + } +} + +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *u = 0; + stbi__gif g; + memset(&g, 0, sizeof(g)); + STBI_NOTUSED(ri); + + u = stbi__gif_load_next(s, &g, comp, req_comp, 0); + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker + if (u) { + *x = g.w; + *y = g.h; + + // moved conversion to after successful load so that the same + // can be done for multiple frames. + if (req_comp && req_comp != 4) + u = stbi__convert_format(u, 4, req_comp, g.w, g.h); + } else if (g.out) { + // if there was an error and we allocated an image buffer, free it! + STBI_FREE(g.out); + } + + // free buffers needed for multiple frame loading; + STBI_FREE(g.history); + STBI_FREE(g.background); + + return u; +} + +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) +{ + return stbi__gif_info_raw(s,x,y,comp); +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int stbi__hdr_test_core(stbi__context *s, const char *signature) +{ + int i; + for (i=0; signature[i]; ++i) + if (stbi__get8(s) != signature[i]) + return 0; + stbi__rewind(s); + return 1; +} + +static int stbi__hdr_test(stbi__context* s) +{ + int r = stbi__hdr_test_core(s, "#?RADIANCE\n"); + stbi__rewind(s); + if(!r) { + r = stbi__hdr_test_core(s, "#?RGBE\n"); + stbi__rewind(s); + } + return r; +} + +#define STBI__HDR_BUFLEN 1024 +static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) +{ + int len=0; + char c = '\0'; + + c = (char) stbi__get8(z); + + while (!stbi__at_eof(z) && c != '\n') { + buffer[len++] = c; + if (len == STBI__HDR_BUFLEN-1) { + // flush to end of line + while (!stbi__at_eof(z) && stbi__get8(z) != '\n') + ; + break; + } + c = (char) stbi__get8(z); + } + + buffer[len] = 0; + return buffer; +} + +static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) +{ + if ( input[3] != 0 ) { + float f1; + // Exponent + f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); + if (req_comp <= 2) + output[0] = (input[0] + input[1] + input[2]) * f1 / 3; + else { + output[0] = input[0] * f1; + output[1] = input[1] * f1; + output[2] = input[2] * f1; + } + if (req_comp == 2) output[1] = 1; + if (req_comp == 4) output[3] = 1; + } else { + switch (req_comp) { + case 4: output[3] = 1; /* fallthrough */ + case 3: output[0] = output[1] = output[2] = 0; + break; + case 2: output[1] = 1; /* fallthrough */ + case 1: output[0] = 0; + break; + } + } +} + +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + char buffer[STBI__HDR_BUFLEN]; + char *token; + int valid = 0; + int width, height; + stbi_uc *scanline; + float *hdr_data; + int len; + unsigned char count, value; + int i, j, k, c1,c2, z; + const char *headerToken; + STBI_NOTUSED(ri); + + // Check identifier + headerToken = stbi__hdr_gettoken(s,buffer); + if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0) + return stbi__errpf("not HDR", "Corrupt HDR image"); + + // Parse header + for(;;) { + token = stbi__hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); + + // Parse width and height + // can't use sscanf() if we're not using stdio! + token = stbi__hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); + token += 3; + height = (int) strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); + token += 3; + width = (int) strtol(token, NULL, 10); + + if (height > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)"); + if (width > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)"); + + *x = width; + *y = height; + + if (comp) *comp = 3; + if (req_comp == 0) req_comp = 3; + + if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0)) + return stbi__errpf("too large", "HDR image is too large"); + + // Read data + hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0); + if (!hdr_data) + return stbi__errpf("outofmem", "Out of memory"); + + // Load image data + // image data is stored as some number of sca + if ( width < 8 || width >= 32768) { + // Read flat data + for (j=0; j < height; ++j) { + for (i=0; i < width; ++i) { + stbi_uc rgbe[4]; + main_decode_loop: + stbi__getn(s, rgbe, 4); + stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); + } + } + } else { + // Read RLE-encoded data + scanline = NULL; + + for (j = 0; j < height; ++j) { + c1 = stbi__get8(s); + c2 = stbi__get8(s); + len = stbi__get8(s); + if (c1 != 2 || c2 != 2 || (len & 0x80)) { + // not run-length encoded, so we have to actually use THIS data as a decoded + // pixel (note this can't be a valid pixel--one of RGB must be >= 128) + stbi_uc rgbe[4]; + rgbe[0] = (stbi_uc) c1; + rgbe[1] = (stbi_uc) c2; + rgbe[2] = (stbi_uc) len; + rgbe[3] = (stbi_uc) stbi__get8(s); + stbi__hdr_convert(hdr_data, rgbe, req_comp); + i = 1; + j = 0; + STBI_FREE(scanline); + goto main_decode_loop; // yes, this makes no sense + } + len <<= 8; + len |= stbi__get8(s); + if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); } + if (scanline == NULL) { + scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0); + if (!scanline) { + STBI_FREE(hdr_data); + return stbi__errpf("outofmem", "Out of memory"); + } + } + + for (k = 0; k < 4; ++k) { + int nleft; + i = 0; + while ((nleft = width - i) > 0) { + count = stbi__get8(s); + if (count > 128) { + // Run + value = stbi__get8(s); + count -= 128; + if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } + for (z = 0; z < count; ++z) + scanline[i++ * 4 + k] = value; + } else { + // Dump + if ((count == 0) || (count > nleft)) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); } + for (z = 0; z < count; ++z) + scanline[i++ * 4 + k] = stbi__get8(s); + } + } + } + for (i=0; i < width; ++i) + stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); + } + if (scanline) + STBI_FREE(scanline); + } + + return hdr_data; +} + +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) +{ + char buffer[STBI__HDR_BUFLEN]; + char *token; + int valid = 0; + int dummy; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + if (stbi__hdr_test(s) == 0) { + stbi__rewind( s ); + return 0; + } + + for(;;) { + token = stbi__hdr_gettoken(s,buffer); + if (token[0] == 0) break; + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; + } + + if (!valid) { + stbi__rewind( s ); + return 0; + } + token = stbi__hdr_gettoken(s,buffer); + if (strncmp(token, "-Y ", 3)) { + stbi__rewind( s ); + return 0; + } + token += 3; + *y = (int) strtol(token, &token, 10); + while (*token == ' ') ++token; + if (strncmp(token, "+X ", 3)) { + stbi__rewind( s ); + return 0; + } + token += 3; + *x = (int) strtol(token, NULL, 10); + *comp = 3; + return 1; +} +#endif // STBI_NO_HDR + +#ifndef STBI_NO_BMP +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) +{ + void *p; + stbi__bmp_data info; + + info.all_a = 255; + p = stbi__bmp_parse_header(s, &info); + if (p == NULL) { + stbi__rewind( s ); + return 0; + } + if (x) *x = s->img_x; + if (y) *y = s->img_y; + if (comp) { + if (info.bpp == 24 && info.ma == 0xff000000) + *comp = 3; + else + *comp = info.ma ? 4 : 3; + } + return 1; +} +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) +{ + int channelCount, dummy, depth; + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + if (stbi__get32be(s) != 0x38425053) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 1) { + stbi__rewind( s ); + return 0; + } + stbi__skip(s, 6); + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) { + stbi__rewind( s ); + return 0; + } + *y = stbi__get32be(s); + *x = stbi__get32be(s); + depth = stbi__get16be(s); + if (depth != 8 && depth != 16) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 3) { + stbi__rewind( s ); + return 0; + } + *comp = 4; + return 1; +} + +static int stbi__psd_is16(stbi__context *s) +{ + int channelCount, depth; + if (stbi__get32be(s) != 0x38425053) { + stbi__rewind( s ); + return 0; + } + if (stbi__get16be(s) != 1) { + stbi__rewind( s ); + return 0; + } + stbi__skip(s, 6); + channelCount = stbi__get16be(s); + if (channelCount < 0 || channelCount > 16) { + stbi__rewind( s ); + return 0; + } + STBI_NOTUSED(stbi__get32be(s)); + STBI_NOTUSED(stbi__get32be(s)); + depth = stbi__get16be(s); + if (depth != 16) { + stbi__rewind( s ); + return 0; + } + return 1; +} +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) +{ + int act_comp=0,num_packets=0,chained,dummy; + stbi__pic_packet packets[10]; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { + stbi__rewind(s); + return 0; + } + + stbi__skip(s, 88); + + *x = stbi__get16be(s); + *y = stbi__get16be(s); + if (stbi__at_eof(s)) { + stbi__rewind( s); + return 0; + } + if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { + stbi__rewind( s ); + return 0; + } + + stbi__skip(s, 8); + + do { + stbi__pic_packet *packet; + + if (num_packets==sizeof(packets)/sizeof(packets[0])) + return 0; + + packet = &packets[num_packets++]; + chained = stbi__get8(s); + packet->size = stbi__get8(s); + packet->type = stbi__get8(s); + packet->channel = stbi__get8(s); + act_comp |= packet->channel; + + if (stbi__at_eof(s)) { + stbi__rewind( s ); + return 0; + } + if (packet->size != 8) { + stbi__rewind( s ); + return 0; + } + } while (chained); + + *comp = (act_comp & 0x10 ? 4 : 3); + + return 1; +} +#endif + +// ************************************************************************************************* +// Portable Gray Map and Portable Pixel Map loader +// by Ken Miller +// +// PGM: http://netpbm.sourceforge.net/doc/pgm.html +// PPM: http://netpbm.sourceforge.net/doc/ppm.html +// +// Known limitations: +// Does not support comments in the header section +// Does not support ASCII image data (formats P2 and P3) + +#ifndef STBI_NO_PNM + +static int stbi__pnm_test(stbi__context *s) +{ + char p, t; + p = (char) stbi__get8(s); + t = (char) stbi__get8(s); + if (p != 'P' || (t != '5' && t != '6')) { + stbi__rewind( s ); + return 0; + } + return 1; +} + +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ + stbi_uc *out; + STBI_NOTUSED(ri); + + ri->bits_per_channel = stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n); + if (ri->bits_per_channel == 0) + return 0; + + if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + + *x = s->img_x; + *y = s->img_y; + if (comp) *comp = s->img_n; + + if (!stbi__mad4sizes_valid(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0)) + return stbi__errpuc("too large", "PNM too large"); + + out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0); + if (!out) return stbi__errpuc("outofmem", "Out of memory"); + if (!stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8))) { + STBI_FREE(out); + return stbi__errpuc("bad PNM", "PNM file truncated"); + } + + if (req_comp && req_comp != s->img_n) { + if (ri->bits_per_channel == 16) { + out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, s->img_n, req_comp, s->img_x, s->img_y); + } else { + out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); + } + if (out == NULL) return out; // stbi__convert_format frees input on failure + } + return out; +} + +static int stbi__pnm_isspace(char c) +{ + return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; +} + +static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) +{ + for (;;) { + while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) + *c = (char) stbi__get8(s); + + if (stbi__at_eof(s) || *c != '#') + break; + + while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' ) + *c = (char) stbi__get8(s); + } +} + +static int stbi__pnm_isdigit(char c) +{ + return c >= '0' && c <= '9'; +} + +static int stbi__pnm_getinteger(stbi__context *s, char *c) +{ + int value = 0; + + while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { + value = value*10 + (*c - '0'); + *c = (char) stbi__get8(s); + if((value > 214748364) || (value == 214748364 && *c > '7')) + return stbi__err("integer parse overflow", "Parsing an integer in the PPM header overflowed a 32-bit int"); + } + + return value; +} + +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) +{ + int maxv, dummy; + char c, p, t; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + stbi__rewind(s); + + // Get identifier + p = (char) stbi__get8(s); + t = (char) stbi__get8(s); + if (p != 'P' || (t != '5' && t != '6')) { + stbi__rewind(s); + return 0; + } + + *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm + + c = (char) stbi__get8(s); + stbi__pnm_skip_whitespace(s, &c); + + *x = stbi__pnm_getinteger(s, &c); // read width + if(*x == 0) + return stbi__err("invalid width", "PPM image header had zero or overflowing width"); + stbi__pnm_skip_whitespace(s, &c); + + *y = stbi__pnm_getinteger(s, &c); // read height + if (*y == 0) + return stbi__err("invalid width", "PPM image header had zero or overflowing width"); + stbi__pnm_skip_whitespace(s, &c); + + maxv = stbi__pnm_getinteger(s, &c); // read max value + if (maxv > 65535) + return stbi__err("max value > 65535", "PPM image supports only 8-bit and 16-bit images"); + else if (maxv > 255) + return 16; + else + return 8; +} + +static int stbi__pnm_is16(stbi__context *s) +{ + if (stbi__pnm_info(s, NULL, NULL, NULL) == 16) + return 1; + return 0; +} +#endif + +static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) +{ + #ifndef STBI_NO_JPEG + if (stbi__jpeg_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PNG + if (stbi__png_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_GIF + if (stbi__gif_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_BMP + if (stbi__bmp_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PSD + if (stbi__psd_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PIC + if (stbi__pic_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_PNM + if (stbi__pnm_info(s, x, y, comp)) return 1; + #endif + + #ifndef STBI_NO_HDR + if (stbi__hdr_info(s, x, y, comp)) return 1; + #endif + + // test tga last because it's a crappy test! + #ifndef STBI_NO_TGA + if (stbi__tga_info(s, x, y, comp)) + return 1; + #endif + return stbi__err("unknown image type", "Image not of any known type, or corrupt"); +} + +static int stbi__is_16_main(stbi__context *s) +{ + #ifndef STBI_NO_PNG + if (stbi__png_is16(s)) return 1; + #endif + + #ifndef STBI_NO_PSD + if (stbi__psd_is16(s)) return 1; + #endif + + #ifndef STBI_NO_PNM + if (stbi__pnm_is16(s)) return 1; + #endif + return 0; +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result; + if (!f) return stbi__err("can't fopen", "Unable to open file"); + result = stbi_info_from_file(f, x, y, comp); + fclose(f); + return result; +} + +STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) +{ + int r; + stbi__context s; + long pos = ftell(f); + stbi__start_file(&s, f); + r = stbi__info_main(&s,x,y,comp); + fseek(f,pos,SEEK_SET); + return r; +} + +STBIDEF int stbi_is_16_bit(char const *filename) +{ + FILE *f = stbi__fopen(filename, "rb"); + int result; + if (!f) return stbi__err("can't fopen", "Unable to open file"); + result = stbi_is_16_bit_from_file(f); + fclose(f); + return result; +} + +STBIDEF int stbi_is_16_bit_from_file(FILE *f) +{ + int r; + stbi__context s; + long pos = ftell(f); + stbi__start_file(&s, f); + r = stbi__is_16_main(&s); + fseek(f,pos,SEEK_SET); + return r; +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); + return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len) +{ + stbi__context s; + stbi__start_mem(&s,buffer,len); + return stbi__is_16_main(&s); +} + +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user) +{ + stbi__context s; + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); + return stbi__is_16_main(&s); +} + +#endif // STB_IMAGE_IMPLEMENTATION + +/* + revision history: + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs + 2.19 (2018-02-11) fix warning + 2.18 (2018-01-30) fix warnings + 2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug + 1-bit BMP + *_is_16_bit api + avoid warnings + 2.16 (2017-07-23) all functions have 16-bit variants; + STBI_NO_STDIO works again; + compilation fixes; + fix rounding in unpremultiply; + optimize vertical flip; + disable raw_len validation; + documentation fixes + 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode; + warning fixes; disable run-time SSE detection on gcc; + uniform handling of optional "return" values; + thread-safe initialization of zlib tables + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs + 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) allocate large structures on the stack + remove white matting for transparent PSD + fix reported channel count for PNG & BMP + re-enable SSE2 in non-gcc 64-bit + support RGB-formatted JPEG + read 16-bit PNGs (only as 8-bit) + 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED + 2.09 (2016-01-16) allow comments in PNM files + 16-bit-per-pixel TGA (not bit-per-component) + info() for TGA could break due to .hdr handling + info() for BMP to shares code instead of sloppy parse + can use STBI_REALLOC_SIZED if allocator doesn't support realloc + code cleanup + 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA + 2.07 (2015-09-13) fix compiler warnings + partial animated GIF support + limited 16-bpc PSD support + #ifdef unused functions + bug with < 92 byte PIC,PNM,HDR,TGA + 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value + 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning + 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit + 2.03 (2015-04-12) extra corruption checking (mmozeiko) + stbi_set_flip_vertically_on_load (nguillemot) + fix NEON support; fix mingw support + 2.02 (2015-01-19) fix incorrect assert, fix warning + 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 + 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG + 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) + progressive JPEG (stb) + PGM/PPM support (Ken Miller) + STBI_MALLOC,STBI_REALLOC,STBI_FREE + GIF bugfix -- seemingly never worked + STBI_NO_*, STBI_ONLY_* + 1.48 (2014-12-14) fix incorrectly-named assert() + 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) + optimize PNG (ryg) + fix bug in interlaced PNG with user-specified channel count (stb) + 1.46 (2014-08-26) + fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG + 1.45 (2014-08-16) + fix MSVC-ARM internal compiler error by wrapping malloc + 1.44 (2014-08-07) + various warning fixes from Ronny Chevalier + 1.43 (2014-07-15) + fix MSVC-only compiler problem in code changed in 1.42 + 1.42 (2014-07-09) + don't define _CRT_SECURE_NO_WARNINGS (affects user code) + fixes to stbi__cleanup_jpeg path + added STBI_ASSERT to avoid requiring assert.h + 1.41 (2014-06-25) + fix search&replace from 1.36 that messed up comments/error messages + 1.40 (2014-06-22) + fix gcc struct-initialization warning + 1.39 (2014-06-15) + fix to TGA optimization when req_comp != number of components in TGA; + fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) + add support for BMP version 5 (more ignored fields) + 1.38 (2014-06-06) + suppress MSVC warnings on integer casts truncating values + fix accidental rename of 'skip' field of I/O + 1.37 (2014-06-04) + remove duplicate typedef + 1.36 (2014-06-03) + convert to header file single-file library + if de-iphone isn't set, load iphone images color-swapped instead of returning NULL + 1.35 (2014-05-27) + various warnings + fix broken STBI_SIMD path + fix bug where stbi_load_from_file no longer left file pointer in correct place + fix broken non-easy path for 32-bit BMP (possibly never used) + TGA optimization by Arseny Kapoulkine + 1.34 (unknown) + use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case + 1.33 (2011-07-14) + make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements + 1.32 (2011-07-13) + support for "info" function for all supported filetypes (SpartanJ) + 1.31 (2011-06-20) + a few more leak fixes, bug in PNG handling (SpartanJ) + 1.30 (2011-06-11) + added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) + removed deprecated format-specific test/load functions + removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway + error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) + fix inefficiency in decoding 32-bit BMP (David Woo) + 1.29 (2010-08-16) + various warning fixes from Aurelien Pocheville + 1.28 (2010-08-01) + fix bug in GIF palette transparency (SpartanJ) + 1.27 (2010-08-01) + cast-to-stbi_uc to fix warnings + 1.26 (2010-07-24) + fix bug in file buffering for PNG reported by SpartanJ + 1.25 (2010-07-17) + refix trans_data warning (Won Chun) + 1.24 (2010-07-12) + perf improvements reading from files on platforms with lock-heavy fgetc() + minor perf improvements for jpeg + deprecated type-specific functions so we'll get feedback if they're needed + attempt to fix trans_data warning (Won Chun) + 1.23 fixed bug in iPhone support + 1.22 (2010-07-10) + removed image *writing* support + stbi_info support from Jetro Lauha + GIF support from Jean-Marc Lienher + iPhone PNG-extensions from James Brown + warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) + 1.21 fix use of 'stbi_uc' in header (reported by jon blow) + 1.20 added support for Softimage PIC, by Tom Seddon + 1.19 bug in interlaced PNG corruption check (found by ryg) + 1.18 (2008-08-02) + fix a threading bug (local mutable static) + 1.17 support interlaced PNG + 1.16 major bugfix - stbi__convert_format converted one too many pixels + 1.15 initialize some fields for thread safety + 1.14 fix threadsafe conversion bug + header-file-only version (#define STBI_HEADER_FILE_ONLY before including) + 1.13 threadsafe + 1.12 const qualifiers in the API + 1.11 Support installable IDCT, colorspace conversion routines + 1.10 Fixes for 64-bit (don't use "unsigned long") + optimized upsampling by Fabian "ryg" Giesen + 1.09 Fix format-conversion for PSD code (bad global variables!) + 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz + 1.07 attempt to fix C++ warning/errors again + 1.06 attempt to fix C++ warning/errors again + 1.05 fix TGA loading to return correct *comp and use good luminance calc + 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free + 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR + 1.02 support for (subset of) HDR files, float interface for preferred access to them + 1.01 fix bug: possible bug in handling right-side up bmps... not sure + fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all + 1.00 interface to zlib that skips zlib header + 0.99 correct handling of alpha in palette + 0.98 TGA loader by lonesock; dynamically add loaders (untested) + 0.97 jpeg errors on too large a file; also catch another malloc failure + 0.96 fix detection of invalid v value - particleman@mollyrocket forum + 0.95 during header scan, seek to markers in case of padding + 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same + 0.93 handle jpegtran output; verbose errors + 0.92 read 4,8,16,24,32-bit BMP files of several formats + 0.91 output 24-bit Windows 3.0 BMP files + 0.90 fix a few more warnings; bump version number to approach 1.0 + 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd + 0.60 fix compiling as c++ + 0.59 fix warnings: merge Dave Moore's -Wall fixes + 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian + 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available + 0.56 fix bug: zlib uncompressed mode len vs. nlen + 0.55 fix bug: restart_interval not initialized to 0 + 0.54 allow NULL for 'int *comp' + 0.53 fix bug in png 3->4; speedup png decoding + 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments + 0.51 obey req_comp requests, 1-component jpegs return as 1-component, + on 'test' only check type, not whether we support this variant + 0.50 (2006-11-19) + first released version +*/ + + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ diff --git a/lib/stb_image_resize2.h b/lib/stb_image_resize2.h new file mode 100644 index 0000000..2f26274 --- /dev/null +++ b/lib/stb_image_resize2.h @@ -0,0 +1,10601 @@ +/* stb_image_resize2 - v2.12 - public domain image resizing + + by Jeff Roberts (v2) and Jorge L Rodriguez + http://github.com/nothings/stb + + Can be threaded with the extended API. SSE2, AVX, Neon and WASM SIMD support. Only + scaling and translation is supported, no rotations or shears. + + COMPILING & LINKING + In one C/C++ file that #includes this file, do this: + #define STB_IMAGE_RESIZE_IMPLEMENTATION + before the #include. That will create the implementation in that file. + + EASY API CALLS: + Easy API downsamples w/Mitchell filter, upsamples w/cubic interpolation, clamps to edge. + + stbir_resize_uint8_srgb( input_pixels, input_w, input_h, input_stride_in_bytes, + output_pixels, output_w, output_h, output_stride_in_bytes, + pixel_layout_enum ) + + stbir_resize_uint8_linear( input_pixels, input_w, input_h, input_stride_in_bytes, + output_pixels, output_w, output_h, output_stride_in_bytes, + pixel_layout_enum ) + + stbir_resize_float_linear( input_pixels, input_w, input_h, input_stride_in_bytes, + output_pixels, output_w, output_h, output_stride_in_bytes, + pixel_layout_enum ) + + If you pass NULL or zero for the output_pixels, we will allocate the output buffer + for you and return it from the function (free with free() or STBIR_FREE). + As a special case, XX_stride_in_bytes of 0 means packed continuously in memory. + + API LEVELS + There are three levels of API - easy-to-use, medium-complexity and extended-complexity. + + See the "header file" section of the source for API documentation. + + ADDITIONAL DOCUMENTATION + + MEMORY ALLOCATION + By default, we use malloc and free for memory allocation. To override the + memory allocation, before the implementation #include, add a: + + #define STBIR_MALLOC(size,user_data) ... + #define STBIR_FREE(ptr,user_data) ... + + Each resize makes exactly one call to malloc/free (unless you use the + extended API where you can do one allocation for many resizes). Under + address sanitizer, we do separate allocations to find overread/writes. + + PERFORMANCE + This library was written with an emphasis on performance. When testing + stb_image_resize with RGBA, the fastest mode is STBIR_4CHANNEL with + STBIR_TYPE_UINT8 pixels and CLAMPed edges (which is what many other resize + libs do by default). Also, make sure SIMD is turned on of course (default + for 64-bit targets). Avoid WRAP edge mode if you want the fastest speed. + + This library also comes with profiling built-in. If you define STBIR_PROFILE, + you can use the advanced API and get low-level profiling information by + calling stbir_resize_extended_profile_info() or stbir_resize_split_profile_info() + after a resize. + + SIMD + Most of the routines have optimized SSE2, AVX, NEON and WASM versions. + + On Microsoft compilers, we automatically turn on SIMD for 64-bit x64 and + ARM; for 32-bit x86 and ARM, you select SIMD mode by defining STBIR_SSE2 or + STBIR_NEON. For AVX and AVX2, we auto-select it by detecting the /arch:AVX + or /arch:AVX2 switches. You can also always manually turn SSE2, AVX or AVX2 + support on by defining STBIR_SSE2, STBIR_AVX or STBIR_AVX2. + + On Linux, SSE2 and Neon is on by default for 64-bit x64 or ARM64. For 32-bit, + we select x86 SIMD mode by whether you have -msse2, -mavx or -mavx2 enabled + on the command line. For 32-bit ARM, you must pass -mfpu=neon-vfpv4 for both + clang and GCC, but GCC also requires an additional -mfp16-format=ieee to + automatically enable NEON. + + On x86 platforms, you can also define STBIR_FP16C to turn on FP16C instructions + for converting back and forth to half-floats. This is autoselected when we + are using AVX2. Clang and GCC also require the -mf16c switch. ARM always uses + the built-in half float hardware NEON instructions. + + You can also tell us to use multiply-add instructions with STBIR_USE_FMA. + Because x86 doesn't always have fma, we turn it off by default to maintain + determinism across all platforms. If you don't care about non-FMA determinism + and are willing to restrict yourself to more recent x86 CPUs (around the AVX + timeframe), then fma will give you around a 15% speedup. + + You can force off SIMD in all cases by defining STBIR_NO_SIMD. You can turn + off AVX or AVX2 specifically with STBIR_NO_AVX or STBIR_NO_AVX2. AVX is 10% + to 40% faster, and AVX2 is generally another 12%. + + ALPHA CHANNEL + Most of the resizing functions provide the ability to control how the alpha + channel of an image is processed. + + When alpha represents transparency, it is important that when combining + colors with filtering, the pixels should not be treated equally; they + should use a weighted average based on their alpha values. For example, + if a pixel is 1% opaque bright green and another pixel is 99% opaque + black and you average them, the average will be 50% opaque, but the + unweighted average and will be a middling green color, while the weighted + average will be nearly black. This means the unweighted version introduced + green energy that didn't exist in the source image. + + (If you want to know why this makes sense, you can work out the math for + the following: consider what happens if you alpha composite a source image + over a fixed color and then average the output, vs. if you average the + source image pixels and then composite that over the same fixed color. + Only the weighted average produces the same result as the ground truth + composite-then-average result.) + + Therefore, it is in general best to "alpha weight" the pixels when applying + filters to them. This essentially means multiplying the colors by the alpha + values before combining them, and then dividing by the alpha value at the + end. + + The computer graphics industry introduced a technique called "premultiplied + alpha" or "associated alpha" in which image colors are stored in image files + already multiplied by their alpha. This saves some math when compositing, + and also avoids the need to divide by the alpha at the end (which is quite + inefficient). However, while premultiplied alpha is common in the movie CGI + industry, it is not commonplace in other industries like videogames, and most + consumer file formats are generally expected to contain not-premultiplied + colors. For example, Photoshop saves PNG files "unpremultiplied", and web + browsers like Chrome and Firefox expect PNG images to be unpremultiplied. + + Note that there are three possibilities that might describe your image + and resize expectation: + + 1. images are not premultiplied, alpha weighting is desired + 2. images are not premultiplied, alpha weighting is not desired + 3. images are premultiplied + + Both case #2 and case #3 require the exact same math: no alpha weighting + should be applied or removed. Only case 1 requires extra math operations; + the other two cases can be handled identically. + + stb_image_resize expects case #1 by default, applying alpha weighting to + images, expecting the input images to be unpremultiplied. This is what the + COLOR+ALPHA buffer types tell the resizer to do. + + When you use the pixel layouts STBIR_RGBA, STBIR_BGRA, STBIR_ARGB, + STBIR_ABGR, STBIR_RX, or STBIR_XR you are telling us that the pixels are + non-premultiplied. In these cases, the resizer will alpha weight the colors + (effectively creating the premultiplied image), do the filtering, and then + convert back to non-premult on exit. + + When you use the pixel layouts STBIR_RGBA_PM, STBIR_RGBA_PM, STBIR_RGBA_PM, + STBIR_RGBA_PM, STBIR_RX_PM or STBIR_XR_PM, you are telling that the pixels + ARE premultiplied. In this case, the resizer doesn't have to do the + premultipling - it can filter directly on the input. This about twice as + fast as the non-premultiplied case, so it's the right option if your data is + already setup correctly. + + When you use the pixel layout STBIR_4CHANNEL or STBIR_2CHANNEL, you are + telling us that there is no channel that represents transparency; it may be + RGB and some unrelated fourth channel that has been stored in the alpha + channel, but it is actually not alpha. No special processing will be + performed. + + The difference between the generic 4 or 2 channel layouts, and the + specialized _PM versions is with the _PM versions you are telling us that + the data *is* alpha, just don't premultiply it. That's important when + using SRGB pixel formats, we need to know where the alpha is, because + it is converted linearly (rather than with the SRGB converters). + + Because alpha weighting produces the same effect as premultiplying, you + even have the option with non-premultiplied inputs to let the resizer + produce a premultiplied output. Because the intially computed alpha-weighted + output image is effectively premultiplied, this is actually more performant + than the normal path which un-premultiplies the output image as a final step. + + Finally, when converting both in and out of non-premulitplied space (for + example, when using STBIR_RGBA), we go to somewhat heroic measures to + ensure that areas with zero alpha value pixels get something reasonable + in the RGB values. If you don't care about the RGB values of zero alpha + pixels, you can call the stbir_set_non_pm_alpha_speed_over_quality() + function - this runs a premultiplied resize about 25% faster. That said, + when you really care about speed, using premultiplied pixels for both in + and out (STBIR_RGBA_PM, etc) much faster than both of these premultiplied + options. + + PIXEL LAYOUT CONVERSION + The resizer can convert from some pixel layouts to others. When using the + stbir_set_pixel_layouts(), you can, for example, specify STBIR_RGBA + on input, and STBIR_ARGB on output, and it will re-organize the channels + during the resize. Currently, you can only convert between two pixel + layouts with the same number of channels. + + DETERMINISM + We commit to being deterministic (from x64 to ARM to scalar to SIMD, etc). + This requires compiling with fast-math off (using at least /fp:precise). + Also, you must turn off fp-contracting (which turns mult+adds into fmas)! + We attempt to do this with pragmas, but with Clang, you usually want to add + -ffp-contract=off to the command line as well. + + For 32-bit x86, you must use SSE and SSE2 codegen for determinism. That is, + if the scalar x87 unit gets used at all, we immediately lose determinism. + On Microsoft Visual Studio 2008 and earlier, from what we can tell there is + no way to be deterministic in 32-bit x86 (some x87 always leaks in, even + with fp:strict). On 32-bit x86 GCC, determinism requires both -msse2 and + -fpmath=sse. + + Note that we will not be deterministic with float data containing NaNs - + the NaNs will propagate differently on different SIMD and platforms. + + If you turn on STBIR_USE_FMA, then we will be deterministic with other + fma targets, but we will differ from non-fma targets (this is unavoidable, + because a fma isn't simply an add with a mult - it also introduces a + rounding difference compared to non-fma instruction sequences. + + FLOAT PIXEL FORMAT RANGE + Any range of values can be used for the non-alpha float data that you pass + in (0 to 1, -1 to 1, whatever). However, if you are inputting float values + but *outputting* bytes or shorts, you must use a range of 0 to 1 so that we + scale back properly. The alpha channel must also be 0 to 1 for any format + that does premultiplication prior to resizing. + + Note also that with float output, using filters with negative lobes, the + output filtered values might go slightly out of range. You can define + STBIR_FLOAT_LOW_CLAMP and/or STBIR_FLOAT_HIGH_CLAMP to specify the range + to clamp to on output, if that's important. + + MAX/MIN SCALE FACTORS + The input pixel resolutions are in integers, and we do the internal pointer + resolution in size_t sized integers. However, the scale ratio from input + resolution to output resolution is calculated in float form. This means + the effective possible scale ratio is limited to 24 bits (or 16 million + to 1). As you get close to the size of the float resolution (again, 16 + million pixels wide or high), you might start seeing float inaccuracy + issues in general in the pipeline. If you have to do extreme resizes, + you can usually do this is multiple stages (using float intermediate + buffers). + + FLIPPED IMAGES + Stride is just the delta from one scanline to the next. This means you can + use a negative stride to handle inverted images (point to the final + scanline and use a negative stride). You can invert the input or output, + using negative strides. + + DEFAULT FILTERS + For functions which don't provide explicit control over what filters to + use, you can change the compile-time defaults with: + + #define STBIR_DEFAULT_FILTER_UPSAMPLE STBIR_FILTER_something + #define STBIR_DEFAULT_FILTER_DOWNSAMPLE STBIR_FILTER_something + + See stbir_filter in the header-file section for the list of filters. + + NEW FILTERS + A number of 1D filter kernels are supplied. For a list of supported + filters, see the stbir_filter enum. You can install your own filters by + using the stbir_set_filter_callbacks function. + + PROGRESS + For interactive use with slow resize operations, you can use the the + scanline callbacks in the extended API. It would have to be a *very* large + image resample to need progress though - we're very fast. + + CEIL and FLOOR + In scalar mode, the only functions we use from math.h are ceilf and floorf, + but if you have your own versions, you can define the STBIR_CEILF(v) and + STBIR_FLOORF(v) macros and we'll use them instead. In SIMD, we just use + our own versions. + + ASSERT + Define STBIR_ASSERT(boolval) to override assert() and not use assert.h + + PORTING FROM VERSION 1 + The API has changed. You can continue to use the old version of stb_image_resize.h, + which is available in the "deprecated/" directory. + + If you're using the old simple-to-use API, porting is straightforward. + (For more advanced APIs, read the documentation.) + + stbir_resize_uint8(): + - call `stbir_resize_uint8_linear`, cast channel count to `stbir_pixel_layout` + + stbir_resize_float(): + - call `stbir_resize_float_linear`, cast channel count to `stbir_pixel_layout` + + stbir_resize_uint8_srgb(): + - function name is unchanged + - cast channel count to `stbir_pixel_layout` + - above is sufficient unless your image has alpha and it's not RGBA/BGRA + - in that case, follow the below instructions for stbir_resize_uint8_srgb_edgemode + + stbir_resize_uint8_srgb_edgemode() + - switch to the "medium complexity" API + - stbir_resize(), very similar API but a few more parameters: + - pixel_layout: cast channel count to `stbir_pixel_layout` + - data_type: STBIR_TYPE_UINT8_SRGB + - edge: unchanged (STBIR_EDGE_WRAP, etc.) + - filter: STBIR_FILTER_DEFAULT + - which channel is alpha is specified in stbir_pixel_layout, see enum for details + + FUTURE TODOS + * For polyphase integral filters, we just memcpy the coeffs to dupe + them, but we should indirect and use the same coeff memory. + * Add pixel layout conversions for sensible different channel counts + (maybe, 1->3/4, 3->4, 4->1, 3->1). + * For SIMD encode and decode scanline routines, do any pre-aligning + for bad input/output buffer alignments and pitch? + * For very wide scanlines, we should we do vertical strips to stay within + L2 cache. Maybe do chunks of 1K pixels at a time. There would be + some pixel reconversion, but probably dwarfed by things falling out + of cache. Probably also something possible with alternating between + scattering and gathering at high resize scales? + * Rewrite the coefficient generator to do many at once. + * AVX-512 vertical kernels - worried about downclocking here. + * Convert the reincludes to macros when we know they aren't changing. + * Experiment with pivoting the horizontal and always using the + vertical filters (which are faster, but perhaps not enough to overcome + the pivot cost and the extra memory touches). Need to buffer the whole + image so have to balance memory use. + * Most of our code is internally function pointers, should we compile + all the SIMD stuff always and dynamically dispatch? + + CONTRIBUTORS + Jeff Roberts: 2.0 implementation, optimizations, SIMD + Martins Mozeiko: NEON simd, WASM simd, clang and GCC whisperer + Fabian Giesen: half float and srgb converters + Sean Barrett: API design, optimizations + Jorge L Rodriguez: Original 1.0 implementation + Aras Pranckevicius: bugfixes + Nathan Reed: warning fixes for 1.0 + + REVISIONS + 2.12 (2024-10-18) fix incorrect use of user_data with STBIR_FREE + 2.11 (2024-09-08) fix harmless asan warnings in 2-channel and 3-channel mode + with AVX-2, fix some weird scaling edge conditions with + point sample mode. + 2.10 (2024-07-27) fix the defines GCC and mingw for loop unroll control, + fix MSVC 32-bit arm half float routines. + 2.09 (2024-06-19) fix the defines for 32-bit ARM GCC builds (was selecting + hardware half floats). + 2.08 (2024-06-10) fix for RGB->BGR three channel flips and add SIMD (thanks + to Ryan Salsbury), fix for sub-rect resizes, use the + pragmas to control unrolling when they are available. + 2.07 (2024-05-24) fix for slow final split during threaded conversions of very + wide scanlines when downsampling (caused by extra input + converting), fix for wide scanline resamples with many + splits (int overflow), fix GCC warning. + 2.06 (2024-02-10) fix for identical width/height 3x or more down-scaling + undersampling a single row on rare resize ratios (about 1%). + 2.05 (2024-02-07) fix for 2 pixel to 1 pixel resizes with wrap (thanks Aras), + fix for output callback (thanks Julien Koenen). + 2.04 (2023-11-17) fix for rare AVX bug, shadowed symbol (thanks Nikola Smiljanic). + 2.03 (2023-11-01) ASAN and TSAN warnings fixed, minor tweaks. + 2.00 (2023-10-10) mostly new source: new api, optimizations, simd, vertical-first, etc + 2x-5x faster without simd, 4x-12x faster with simd, + in some cases, 20x to 40x faster esp resizing large to very small. + 0.96 (2019-03-04) fixed warnings + 0.95 (2017-07-23) fixed warnings + 0.94 (2017-03-18) fixed warnings + 0.93 (2017-03-03) fixed bug with certain combinations of heights + 0.92 (2017-01-02) fix integer overflow on large (>2GB) images + 0.91 (2016-04-02) fix warnings; fix handling of subpixel regions + 0.90 (2014-09-17) first released version + + LICENSE + See end of file for license information. +*/ + +#if !defined(STB_IMAGE_RESIZE_DO_HORIZONTALS) && !defined(STB_IMAGE_RESIZE_DO_VERTICALS) && !defined(STB_IMAGE_RESIZE_DO_CODERS) // for internal re-includes + +#ifndef STBIR_INCLUDE_STB_IMAGE_RESIZE2_H +#define STBIR_INCLUDE_STB_IMAGE_RESIZE2_H + +#include <stddef.h> +#ifdef _MSC_VER +typedef unsigned char stbir_uint8; +typedef unsigned short stbir_uint16; +typedef unsigned int stbir_uint32; +typedef unsigned __int64 stbir_uint64; +#else +#include <stdint.h> +typedef uint8_t stbir_uint8; +typedef uint16_t stbir_uint16; +typedef uint32_t stbir_uint32; +typedef uint64_t stbir_uint64; +#endif + +#ifdef _M_IX86_FP +#if ( _M_IX86_FP >= 1 ) +#ifndef STBIR_SSE +#define STBIR_SSE +#endif +#endif +#endif + +#if defined(_x86_64) || defined( __x86_64__ ) || defined( _M_X64 ) || defined(__x86_64) || defined(_M_AMD64) || defined(__SSE2__) || defined(STBIR_SSE) || defined(STBIR_SSE2) + #ifndef STBIR_SSE2 + #define STBIR_SSE2 + #endif + #if defined(__AVX__) || defined(STBIR_AVX2) + #ifndef STBIR_AVX + #ifndef STBIR_NO_AVX + #define STBIR_AVX + #endif + #endif + #endif + #if defined(__AVX2__) || defined(STBIR_AVX2) + #ifndef STBIR_NO_AVX2 + #ifndef STBIR_AVX2 + #define STBIR_AVX2 + #endif + #if defined( _MSC_VER ) && !defined(__clang__) + #ifndef STBIR_FP16C // FP16C instructions are on all AVX2 cpus, so we can autoselect it here on microsoft - clang needs -m16c + #define STBIR_FP16C + #endif + #endif + #endif + #endif + #ifdef __F16C__ + #ifndef STBIR_FP16C // turn on FP16C instructions if the define is set (for clang and gcc) + #define STBIR_FP16C + #endif + #endif +#endif + +#if defined( _M_ARM64 ) || defined( __aarch64__ ) || defined( __arm64__ ) || ((__ARM_NEON_FP & 4) != 0) || defined(__ARM_NEON__) +#ifndef STBIR_NEON +#define STBIR_NEON +#endif +#endif + +#if defined(_M_ARM) || defined(__arm__) +#ifdef STBIR_USE_FMA +#undef STBIR_USE_FMA // no FMA for 32-bit arm on MSVC +#endif +#endif + +#if defined(__wasm__) && defined(__wasm_simd128__) +#ifndef STBIR_WASM +#define STBIR_WASM +#endif +#endif + +#ifndef STBIRDEF +#ifdef STB_IMAGE_RESIZE_STATIC +#define STBIRDEF static +#else +#ifdef __cplusplus +#define STBIRDEF extern "C" +#else +#define STBIRDEF extern +#endif +#endif +#endif + +////////////////////////////////////////////////////////////////////////////// +//// start "header file" /////////////////////////////////////////////////// +// +// Easy-to-use API: +// +// * stride is the offset between successive rows of image data +// in memory, in bytes. specify 0 for packed continuously in memory +// * colorspace is linear or sRGB as specified by function name +// * Uses the default filters +// * Uses edge mode clamped +// * returned result is 1 for success or 0 in case of an error. + + +// stbir_pixel_layout specifies: +// number of channels +// order of channels +// whether color is premultiplied by alpha +// for back compatibility, you can cast the old channel count to an stbir_pixel_layout +typedef enum +{ + STBIR_1CHANNEL = 1, + STBIR_2CHANNEL = 2, + STBIR_RGB = 3, // 3-chan, with order specified (for channel flipping) + STBIR_BGR = 0, // 3-chan, with order specified (for channel flipping) + STBIR_4CHANNEL = 5, + + STBIR_RGBA = 4, // alpha formats, where alpha is NOT premultiplied into color channels + STBIR_BGRA = 6, + STBIR_ARGB = 7, + STBIR_ABGR = 8, + STBIR_RA = 9, + STBIR_AR = 10, + + STBIR_RGBA_PM = 11, // alpha formats, where alpha is premultiplied into color channels + STBIR_BGRA_PM = 12, + STBIR_ARGB_PM = 13, + STBIR_ABGR_PM = 14, + STBIR_RA_PM = 15, + STBIR_AR_PM = 16, + + STBIR_RGBA_NO_AW = 11, // alpha formats, where NO alpha weighting is applied at all! + STBIR_BGRA_NO_AW = 12, // these are just synonyms for the _PM flags (which also do + STBIR_ARGB_NO_AW = 13, // no alpha weighting). These names just make it more clear + STBIR_ABGR_NO_AW = 14, // for some folks). + STBIR_RA_NO_AW = 15, + STBIR_AR_NO_AW = 16, + +} stbir_pixel_layout; + +//=============================================================== +// Simple-complexity API +// +// If output_pixels is NULL (0), then we will allocate the buffer and return it to you. +//-------------------------------- + +STBIRDEF unsigned char * stbir_resize_uint8_srgb( const unsigned char *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + unsigned char *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_type ); + +STBIRDEF unsigned char * stbir_resize_uint8_linear( const unsigned char *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + unsigned char *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_type ); + +STBIRDEF float * stbir_resize_float_linear( const float *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + float *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_type ); +//=============================================================== + +//=============================================================== +// Medium-complexity API +// +// This extends the easy-to-use API as follows: +// +// * Can specify the datatype - U8, U8_SRGB, U16, FLOAT, HALF_FLOAT +// * Edge wrap can selected explicitly +// * Filter can be selected explicitly +//-------------------------------- + +typedef enum +{ + STBIR_EDGE_CLAMP = 0, + STBIR_EDGE_REFLECT = 1, + STBIR_EDGE_WRAP = 2, // this edge mode is slower and uses more memory + STBIR_EDGE_ZERO = 3, +} stbir_edge; + +typedef enum +{ + STBIR_FILTER_DEFAULT = 0, // use same filter type that easy-to-use API chooses + STBIR_FILTER_BOX = 1, // A trapezoid w/1-pixel wide ramps, same result as box for integer scale ratios + STBIR_FILTER_TRIANGLE = 2, // On upsampling, produces same results as bilinear texture filtering + STBIR_FILTER_CUBICBSPLINE = 3, // The cubic b-spline (aka Mitchell-Netrevalli with B=1,C=0), gaussian-esque + STBIR_FILTER_CATMULLROM = 4, // An interpolating cubic spline + STBIR_FILTER_MITCHELL = 5, // Mitchell-Netrevalli filter with B=1/3, C=1/3 + STBIR_FILTER_POINT_SAMPLE = 6, // Simple point sampling + STBIR_FILTER_OTHER = 7, // User callback specified +} stbir_filter; + +typedef enum +{ + STBIR_TYPE_UINT8 = 0, + STBIR_TYPE_UINT8_SRGB = 1, + STBIR_TYPE_UINT8_SRGB_ALPHA = 2, // alpha channel, when present, should also be SRGB (this is very unusual) + STBIR_TYPE_UINT16 = 3, + STBIR_TYPE_FLOAT = 4, + STBIR_TYPE_HALF_FLOAT = 5 +} stbir_datatype; + +// medium api +STBIRDEF void * stbir_resize( const void *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + void *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_layout, stbir_datatype data_type, + stbir_edge edge, stbir_filter filter ); +//=============================================================== + + + +//=============================================================== +// Extended-complexity API +// +// This API exposes all resize functionality. +// +// * Separate filter types for each axis +// * Separate edge modes for each axis +// * Separate input and output data types +// * Can specify regions with subpixel correctness +// * Can specify alpha flags +// * Can specify a memory callback +// * Can specify a callback data type for pixel input and output +// * Can be threaded for a single resize +// * Can be used to resize many frames without recalculating the sampler info +// +// Use this API as follows: +// 1) Call the stbir_resize_init function on a local STBIR_RESIZE structure +// 2) Call any of the stbir_set functions +// 3) Optionally call stbir_build_samplers() if you are going to resample multiple times +// with the same input and output dimensions (like resizing video frames) +// 4) Resample by calling stbir_resize_extended(). +// 5) Call stbir_free_samplers() if you called stbir_build_samplers() +//-------------------------------- + + +// Types: + +// INPUT CALLBACK: this callback is used for input scanlines +typedef void const * stbir_input_callback( void * optional_output, void const * input_ptr, int num_pixels, int x, int y, void * context ); + +// OUTPUT CALLBACK: this callback is used for output scanlines +typedef void stbir_output_callback( void const * output_ptr, int num_pixels, int y, void * context ); + +// callbacks for user installed filters +typedef float stbir__kernel_callback( float x, float scale, void * user_data ); // centered at zero +typedef float stbir__support_callback( float scale, void * user_data ); + +// internal structure with precomputed scaling +typedef struct stbir__info stbir__info; + +typedef struct STBIR_RESIZE // use the stbir_resize_init and stbir_override functions to set these values for future compatibility +{ + void * user_data; + void const * input_pixels; + int input_w, input_h; + double input_s0, input_t0, input_s1, input_t1; + stbir_input_callback * input_cb; + void * output_pixels; + int output_w, output_h; + int output_subx, output_suby, output_subw, output_subh; + stbir_output_callback * output_cb; + int input_stride_in_bytes; + int output_stride_in_bytes; + int splits; + int fast_alpha; + int needs_rebuild; + int called_alloc; + stbir_pixel_layout input_pixel_layout_public; + stbir_pixel_layout output_pixel_layout_public; + stbir_datatype input_data_type; + stbir_datatype output_data_type; + stbir_filter horizontal_filter, vertical_filter; + stbir_edge horizontal_edge, vertical_edge; + stbir__kernel_callback * horizontal_filter_kernel; stbir__support_callback * horizontal_filter_support; + stbir__kernel_callback * vertical_filter_kernel; stbir__support_callback * vertical_filter_support; + stbir__info * samplers; +} STBIR_RESIZE; + +// extended complexity api + + +// First off, you must ALWAYS call stbir_resize_init on your resize structure before any of the other calls! +STBIRDEF void stbir_resize_init( STBIR_RESIZE * resize, + const void *input_pixels, int input_w, int input_h, int input_stride_in_bytes, // stride can be zero + void *output_pixels, int output_w, int output_h, int output_stride_in_bytes, // stride can be zero + stbir_pixel_layout pixel_layout, stbir_datatype data_type ); + +//=============================================================== +// You can update these parameters any time after resize_init and there is no cost +//-------------------------------- + +STBIRDEF void stbir_set_datatypes( STBIR_RESIZE * resize, stbir_datatype input_type, stbir_datatype output_type ); +STBIRDEF void stbir_set_pixel_callbacks( STBIR_RESIZE * resize, stbir_input_callback * input_cb, stbir_output_callback * output_cb ); // no callbacks by default +STBIRDEF void stbir_set_user_data( STBIR_RESIZE * resize, void * user_data ); // pass back STBIR_RESIZE* by default +STBIRDEF void stbir_set_buffer_ptrs( STBIR_RESIZE * resize, const void * input_pixels, int input_stride_in_bytes, void * output_pixels, int output_stride_in_bytes ); + +//=============================================================== + + +//=============================================================== +// If you call any of these functions, you will trigger a sampler rebuild! +//-------------------------------- + +STBIRDEF int stbir_set_pixel_layouts( STBIR_RESIZE * resize, stbir_pixel_layout input_pixel_layout, stbir_pixel_layout output_pixel_layout ); // sets new buffer layouts +STBIRDEF int stbir_set_edgemodes( STBIR_RESIZE * resize, stbir_edge horizontal_edge, stbir_edge vertical_edge ); // CLAMP by default + +STBIRDEF int stbir_set_filters( STBIR_RESIZE * resize, stbir_filter horizontal_filter, stbir_filter vertical_filter ); // STBIR_DEFAULT_FILTER_UPSAMPLE/DOWNSAMPLE by default +STBIRDEF int stbir_set_filter_callbacks( STBIR_RESIZE * resize, stbir__kernel_callback * horizontal_filter, stbir__support_callback * horizontal_support, stbir__kernel_callback * vertical_filter, stbir__support_callback * vertical_support ); + +STBIRDEF int stbir_set_pixel_subrect( STBIR_RESIZE * resize, int subx, int suby, int subw, int subh ); // sets both sub-regions (full regions by default) +STBIRDEF int stbir_set_input_subrect( STBIR_RESIZE * resize, double s0, double t0, double s1, double t1 ); // sets input sub-region (full region by default) +STBIRDEF int stbir_set_output_pixel_subrect( STBIR_RESIZE * resize, int subx, int suby, int subw, int subh ); // sets output sub-region (full region by default) + +// when inputting AND outputting non-premultiplied alpha pixels, we use a slower but higher quality technique +// that fills the zero alpha pixel's RGB values with something plausible. If you don't care about areas of +// zero alpha, you can call this function to get about a 25% speed improvement for STBIR_RGBA to STBIR_RGBA +// types of resizes. +STBIRDEF int stbir_set_non_pm_alpha_speed_over_quality( STBIR_RESIZE * resize, int non_pma_alpha_speed_over_quality ); +//=============================================================== + + +//=============================================================== +// You can call build_samplers to prebuild all the internal data we need to resample. +// Then, if you call resize_extended many times with the same resize, you only pay the +// cost once. +// If you do call build_samplers, you MUST call free_samplers eventually. +//-------------------------------- + +// This builds the samplers and does one allocation +STBIRDEF int stbir_build_samplers( STBIR_RESIZE * resize ); + +// You MUST call this, if you call stbir_build_samplers or stbir_build_samplers_with_splits +STBIRDEF void stbir_free_samplers( STBIR_RESIZE * resize ); +//=============================================================== + + +// And this is the main function to perform the resize synchronously on one thread. +STBIRDEF int stbir_resize_extended( STBIR_RESIZE * resize ); + + +//=============================================================== +// Use these functions for multithreading. +// 1) You call stbir_build_samplers_with_splits first on the main thread +// 2) Then stbir_resize_with_split on each thread +// 3) stbir_free_samplers when done on the main thread +//-------------------------------- + +// This will build samplers for threading. +// You can pass in the number of threads you'd like to use (try_splits). +// It returns the number of splits (threads) that you can call it with. +/// It might be less if the image resize can't be split up that many ways. + +STBIRDEF int stbir_build_samplers_with_splits( STBIR_RESIZE * resize, int try_splits ); + +// This function does a split of the resizing (you call this fuction for each +// split, on multiple threads). A split is a piece of the output resize pixel space. + +// Note that you MUST call stbir_build_samplers_with_splits before stbir_resize_extended_split! + +// Usually, you will always call stbir_resize_split with split_start as the thread_index +// and "1" for the split_count. +// But, if you have a weird situation where you MIGHT want 8 threads, but sometimes +// only 4 threads, you can use 0,2,4,6 for the split_start's and use "2" for the +// split_count each time to turn in into a 4 thread resize. (This is unusual). + +STBIRDEF int stbir_resize_extended_split( STBIR_RESIZE * resize, int split_start, int split_count ); +//=============================================================== + + +//=============================================================== +// Pixel Callbacks info: +//-------------------------------- + +// The input callback is super flexible - it calls you with the input address +// (based on the stride and base pointer), it gives you an optional_output +// pointer that you can fill, or you can just return your own pointer into +// your own data. +// +// You can also do conversion from non-supported data types if necessary - in +// this case, you ignore the input_ptr and just use the x and y parameters to +// calculate your own input_ptr based on the size of each non-supported pixel. +// (Something like the third example below.) +// +// You can also install just an input or just an output callback by setting the +// callback that you don't want to zero. +// +// First example, progress: (getting a callback that you can monitor the progress): +// void const * my_callback( void * optional_output, void const * input_ptr, int num_pixels, int x, int y, void * context ) +// { +// percentage_done = y / input_height; +// return input_ptr; // use buffer from call +// } +// +// Next example, copying: (copy from some other buffer or stream): +// void const * my_callback( void * optional_output, void const * input_ptr, int num_pixels, int x, int y, void * context ) +// { +// CopyOrStreamData( optional_output, other_data_src, num_pixels * pixel_width_in_bytes ); +// return optional_output; // return the optional buffer that we filled +// } +// +// Third example, input another buffer without copying: (zero-copy from other buffer): +// void const * my_callback( void * optional_output, void const * input_ptr, int num_pixels, int x, int y, void * context ) +// { +// void * pixels = ( (char*) other_image_base ) + ( y * other_image_stride ) + ( x * other_pixel_width_in_bytes ); +// return pixels; // return pointer to your data without copying +// } +// +// +// The output callback is considerably simpler - it just calls you so that you can dump +// out each scanline. You could even directly copy out to disk if you have a simple format +// like TGA or BMP. You can also convert to other output types here if you want. +// +// Simple example: +// void const * my_output( void * output_ptr, int num_pixels, int y, void * context ) +// { +// percentage_done = y / output_height; +// fwrite( output_ptr, pixel_width_in_bytes, num_pixels, output_file ); +// } +//=============================================================== + + + + +//=============================================================== +// optional built-in profiling API +//-------------------------------- + +#ifdef STBIR_PROFILE + +typedef struct STBIR_PROFILE_INFO +{ + stbir_uint64 total_clocks; + + // how many clocks spent (of total_clocks) in the various resize routines, along with a string description + // there are "resize_count" number of zones + stbir_uint64 clocks[ 8 ]; + char const ** descriptions; + + // count of clocks and descriptions + stbir_uint32 count; +} STBIR_PROFILE_INFO; + +// use after calling stbir_resize_extended (or stbir_build_samplers or stbir_build_samplers_with_splits) +STBIRDEF void stbir_resize_build_profile_info( STBIR_PROFILE_INFO * out_info, STBIR_RESIZE const * resize ); + +// use after calling stbir_resize_extended +STBIRDEF void stbir_resize_extended_profile_info( STBIR_PROFILE_INFO * out_info, STBIR_RESIZE const * resize ); + +// use after calling stbir_resize_extended_split +STBIRDEF void stbir_resize_split_profile_info( STBIR_PROFILE_INFO * out_info, STBIR_RESIZE const * resize, int split_start, int split_num ); + +//=============================================================== + +#endif + + +//// end header file ///////////////////////////////////////////////////// +#endif // STBIR_INCLUDE_STB_IMAGE_RESIZE2_H + +#if defined(STB_IMAGE_RESIZE_IMPLEMENTATION) || defined(STB_IMAGE_RESIZE2_IMPLEMENTATION) + +#ifndef STBIR_ASSERT +#include <assert.h> +#define STBIR_ASSERT(x) assert(x) +#endif + +#ifndef STBIR_MALLOC +#include <stdlib.h> +#define STBIR_MALLOC(size,user_data) ((void)(user_data), malloc(size)) +#define STBIR_FREE(ptr,user_data) ((void)(user_data), free(ptr)) +// (we used the comma operator to evaluate user_data, to avoid "unused parameter" warnings) +#endif + +#ifdef _MSC_VER + +#define stbir__inline __forceinline + +#else + +#define stbir__inline __inline__ + +// Clang address sanitizer +#if defined(__has_feature) + #if __has_feature(address_sanitizer) || __has_feature(memory_sanitizer) + #ifndef STBIR__SEPARATE_ALLOCATIONS + #define STBIR__SEPARATE_ALLOCATIONS + #endif + #endif +#endif + +#endif + +// GCC and MSVC +#if defined(__SANITIZE_ADDRESS__) + #ifndef STBIR__SEPARATE_ALLOCATIONS + #define STBIR__SEPARATE_ALLOCATIONS + #endif +#endif + +// Always turn off automatic FMA use - use STBIR_USE_FMA if you want. +// Otherwise, this is a determinism disaster. +#ifndef STBIR_DONT_CHANGE_FP_CONTRACT // override in case you don't want this behavior +#if defined(_MSC_VER) && !defined(__clang__) +#if _MSC_VER > 1200 +#pragma fp_contract(off) +#endif +#elif defined(__GNUC__) && !defined(__clang__) +#pragma GCC optimize("fp-contract=off") +#else +#pragma STDC FP_CONTRACT OFF +#endif +#endif + +#ifdef _MSC_VER +#define STBIR__UNUSED(v) (void)(v) +#else +#define STBIR__UNUSED(v) (void)sizeof(v) +#endif + +#define STBIR__ARRAY_SIZE(a) (sizeof((a))/sizeof((a)[0])) + + +#ifndef STBIR_DEFAULT_FILTER_UPSAMPLE +#define STBIR_DEFAULT_FILTER_UPSAMPLE STBIR_FILTER_CATMULLROM +#endif + +#ifndef STBIR_DEFAULT_FILTER_DOWNSAMPLE +#define STBIR_DEFAULT_FILTER_DOWNSAMPLE STBIR_FILTER_MITCHELL +#endif + + +#ifndef STBIR__HEADER_FILENAME +#define STBIR__HEADER_FILENAME "stb_image_resize2.h" +#endif + +// the internal pixel layout enums are in a different order, so we can easily do range comparisons of types +// the public pixel layout is ordered in a way that if you cast num_channels (1-4) to the enum, you get something sensible +typedef enum +{ + STBIRI_1CHANNEL = 0, + STBIRI_2CHANNEL = 1, + STBIRI_RGB = 2, + STBIRI_BGR = 3, + STBIRI_4CHANNEL = 4, + + STBIRI_RGBA = 5, + STBIRI_BGRA = 6, + STBIRI_ARGB = 7, + STBIRI_ABGR = 8, + STBIRI_RA = 9, + STBIRI_AR = 10, + + STBIRI_RGBA_PM = 11, + STBIRI_BGRA_PM = 12, + STBIRI_ARGB_PM = 13, + STBIRI_ABGR_PM = 14, + STBIRI_RA_PM = 15, + STBIRI_AR_PM = 16, +} stbir_internal_pixel_layout; + +// define the public pixel layouts to not compile inside the implementation (to avoid accidental use) +#define STBIR_BGR bad_dont_use_in_implementation +#define STBIR_1CHANNEL STBIR_BGR +#define STBIR_2CHANNEL STBIR_BGR +#define STBIR_RGB STBIR_BGR +#define STBIR_RGBA STBIR_BGR +#define STBIR_4CHANNEL STBIR_BGR +#define STBIR_BGRA STBIR_BGR +#define STBIR_ARGB STBIR_BGR +#define STBIR_ABGR STBIR_BGR +#define STBIR_RA STBIR_BGR +#define STBIR_AR STBIR_BGR +#define STBIR_RGBA_PM STBIR_BGR +#define STBIR_BGRA_PM STBIR_BGR +#define STBIR_ARGB_PM STBIR_BGR +#define STBIR_ABGR_PM STBIR_BGR +#define STBIR_RA_PM STBIR_BGR +#define STBIR_AR_PM STBIR_BGR + +// must match stbir_datatype +static unsigned char stbir__type_size[] = { + 1,1,1,2,4,2 // STBIR_TYPE_UINT8,STBIR_TYPE_UINT8_SRGB,STBIR_TYPE_UINT8_SRGB_ALPHA,STBIR_TYPE_UINT16,STBIR_TYPE_FLOAT,STBIR_TYPE_HALF_FLOAT +}; + +// When gathering, the contributors are which source pixels contribute. +// When scattering, the contributors are which destination pixels are contributed to. +typedef struct +{ + int n0; // First contributing pixel + int n1; // Last contributing pixel +} stbir__contributors; + +typedef struct +{ + int lowest; // First sample index for whole filter + int highest; // Last sample index for whole filter + int widest; // widest single set of samples for an output +} stbir__filter_extent_info; + +typedef struct +{ + int n0; // First pixel of decode buffer to write to + int n1; // Last pixel of decode that will be written to + int pixel_offset_for_input; // Pixel offset into input_scanline +} stbir__span; + +typedef struct stbir__scale_info +{ + int input_full_size; + int output_sub_size; + float scale; + float inv_scale; + float pixel_shift; // starting shift in output pixel space (in pixels) + int scale_is_rational; + stbir_uint32 scale_numerator, scale_denominator; +} stbir__scale_info; + +typedef struct +{ + stbir__contributors * contributors; + float* coefficients; + stbir__contributors * gather_prescatter_contributors; + float * gather_prescatter_coefficients; + stbir__scale_info scale_info; + float support; + stbir_filter filter_enum; + stbir__kernel_callback * filter_kernel; + stbir__support_callback * filter_support; + stbir_edge edge; + int coefficient_width; + int filter_pixel_width; + int filter_pixel_margin; + int num_contributors; + int contributors_size; + int coefficients_size; + stbir__filter_extent_info extent_info; + int is_gather; // 0 = scatter, 1 = gather with scale >= 1, 2 = gather with scale < 1 + int gather_prescatter_num_contributors; + int gather_prescatter_coefficient_width; + int gather_prescatter_contributors_size; + int gather_prescatter_coefficients_size; +} stbir__sampler; + +typedef struct +{ + stbir__contributors conservative; + int edge_sizes[2]; // this can be less than filter_pixel_margin, if the filter and scaling falls off + stbir__span spans[2]; // can be two spans, if doing input subrect with clamp mode WRAP +} stbir__extents; + +typedef struct +{ +#ifdef STBIR_PROFILE + union + { + struct { stbir_uint64 total, looping, vertical, horizontal, decode, encode, alpha, unalpha; } named; + stbir_uint64 array[8]; + } profile; + stbir_uint64 * current_zone_excluded_ptr; +#endif + float* decode_buffer; + + int ring_buffer_first_scanline; + int ring_buffer_last_scanline; + int ring_buffer_begin_index; // first_scanline is at this index in the ring buffer + int start_output_y, end_output_y; + int start_input_y, end_input_y; // used in scatter only + + #ifdef STBIR__SEPARATE_ALLOCATIONS + float** ring_buffers; // one pointer for each ring buffer + #else + float* ring_buffer; // one big buffer that we index into + #endif + + float* vertical_buffer; + + char no_cache_straddle[64]; +} stbir__per_split_info; + +typedef void stbir__decode_pixels_func( float * decode, int width_times_channels, void const * input ); +typedef void stbir__alpha_weight_func( float * decode_buffer, int width_times_channels ); +typedef void stbir__horizontal_gather_channels_func( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, + stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ); +typedef void stbir__alpha_unweight_func(float * encode_buffer, int width_times_channels ); +typedef void stbir__encode_pixels_func( void * output, int width_times_channels, float const * encode ); + +struct stbir__info +{ +#ifdef STBIR_PROFILE + union + { + struct { stbir_uint64 total, build, alloc, horizontal, vertical, cleanup, pivot; } named; + stbir_uint64 array[7]; + } profile; + stbir_uint64 * current_zone_excluded_ptr; +#endif + stbir__sampler horizontal; + stbir__sampler vertical; + + void const * input_data; + void * output_data; + + int input_stride_bytes; + int output_stride_bytes; + int ring_buffer_length_bytes; // The length of an individual entry in the ring buffer. The total number of ring buffers is stbir__get_filter_pixel_width(filter) + int ring_buffer_num_entries; // Total number of entries in the ring buffer. + + stbir_datatype input_type; + stbir_datatype output_type; + + stbir_input_callback * in_pixels_cb; + void * user_data; + stbir_output_callback * out_pixels_cb; + + stbir__extents scanline_extents; + + void * alloced_mem; + stbir__per_split_info * split_info; // by default 1, but there will be N of these allocated based on the thread init you did + + stbir__decode_pixels_func * decode_pixels; + stbir__alpha_weight_func * alpha_weight; + stbir__horizontal_gather_channels_func * horizontal_gather_channels; + stbir__alpha_unweight_func * alpha_unweight; + stbir__encode_pixels_func * encode_pixels; + + int alloc_ring_buffer_num_entries; // Number of entries in the ring buffer that will be allocated + int splits; // count of splits + + stbir_internal_pixel_layout input_pixel_layout_internal; + stbir_internal_pixel_layout output_pixel_layout_internal; + + int input_color_and_type; + int offset_x, offset_y; // offset within output_data + int vertical_first; + int channels; + int effective_channels; // same as channels, except on RGBA/ARGB (7), or XA/AX (3) + size_t alloced_total; +}; + + +#define stbir__max_uint8_as_float 255.0f +#define stbir__max_uint16_as_float 65535.0f +#define stbir__max_uint8_as_float_inverted (1.0f/255.0f) +#define stbir__max_uint16_as_float_inverted (1.0f/65535.0f) +#define stbir__small_float ((float)1 / (1 << 20) / (1 << 20) / (1 << 20) / (1 << 20) / (1 << 20) / (1 << 20)) + +// min/max friendly +#define STBIR_CLAMP(x, xmin, xmax) for(;;) { \ + if ( (x) < (xmin) ) (x) = (xmin); \ + if ( (x) > (xmax) ) (x) = (xmax); \ + break; \ +} + +static stbir__inline int stbir__min(int a, int b) +{ + return a < b ? a : b; +} + +static stbir__inline int stbir__max(int a, int b) +{ + return a > b ? a : b; +} + +static float stbir__srgb_uchar_to_linear_float[256] = { + 0.000000f, 0.000304f, 0.000607f, 0.000911f, 0.001214f, 0.001518f, 0.001821f, 0.002125f, 0.002428f, 0.002732f, 0.003035f, + 0.003347f, 0.003677f, 0.004025f, 0.004391f, 0.004777f, 0.005182f, 0.005605f, 0.006049f, 0.006512f, 0.006995f, 0.007499f, + 0.008023f, 0.008568f, 0.009134f, 0.009721f, 0.010330f, 0.010960f, 0.011612f, 0.012286f, 0.012983f, 0.013702f, 0.014444f, + 0.015209f, 0.015996f, 0.016807f, 0.017642f, 0.018500f, 0.019382f, 0.020289f, 0.021219f, 0.022174f, 0.023153f, 0.024158f, + 0.025187f, 0.026241f, 0.027321f, 0.028426f, 0.029557f, 0.030713f, 0.031896f, 0.033105f, 0.034340f, 0.035601f, 0.036889f, + 0.038204f, 0.039546f, 0.040915f, 0.042311f, 0.043735f, 0.045186f, 0.046665f, 0.048172f, 0.049707f, 0.051269f, 0.052861f, + 0.054480f, 0.056128f, 0.057805f, 0.059511f, 0.061246f, 0.063010f, 0.064803f, 0.066626f, 0.068478f, 0.070360f, 0.072272f, + 0.074214f, 0.076185f, 0.078187f, 0.080220f, 0.082283f, 0.084376f, 0.086500f, 0.088656f, 0.090842f, 0.093059f, 0.095307f, + 0.097587f, 0.099899f, 0.102242f, 0.104616f, 0.107023f, 0.109462f, 0.111932f, 0.114435f, 0.116971f, 0.119538f, 0.122139f, + 0.124772f, 0.127438f, 0.130136f, 0.132868f, 0.135633f, 0.138432f, 0.141263f, 0.144128f, 0.147027f, 0.149960f, 0.152926f, + 0.155926f, 0.158961f, 0.162029f, 0.165132f, 0.168269f, 0.171441f, 0.174647f, 0.177888f, 0.181164f, 0.184475f, 0.187821f, + 0.191202f, 0.194618f, 0.198069f, 0.201556f, 0.205079f, 0.208637f, 0.212231f, 0.215861f, 0.219526f, 0.223228f, 0.226966f, + 0.230740f, 0.234551f, 0.238398f, 0.242281f, 0.246201f, 0.250158f, 0.254152f, 0.258183f, 0.262251f, 0.266356f, 0.270498f, + 0.274677f, 0.278894f, 0.283149f, 0.287441f, 0.291771f, 0.296138f, 0.300544f, 0.304987f, 0.309469f, 0.313989f, 0.318547f, + 0.323143f, 0.327778f, 0.332452f, 0.337164f, 0.341914f, 0.346704f, 0.351533f, 0.356400f, 0.361307f, 0.366253f, 0.371238f, + 0.376262f, 0.381326f, 0.386430f, 0.391573f, 0.396755f, 0.401978f, 0.407240f, 0.412543f, 0.417885f, 0.423268f, 0.428691f, + 0.434154f, 0.439657f, 0.445201f, 0.450786f, 0.456411f, 0.462077f, 0.467784f, 0.473532f, 0.479320f, 0.485150f, 0.491021f, + 0.496933f, 0.502887f, 0.508881f, 0.514918f, 0.520996f, 0.527115f, 0.533276f, 0.539480f, 0.545725f, 0.552011f, 0.558340f, + 0.564712f, 0.571125f, 0.577581f, 0.584078f, 0.590619f, 0.597202f, 0.603827f, 0.610496f, 0.617207f, 0.623960f, 0.630757f, + 0.637597f, 0.644480f, 0.651406f, 0.658375f, 0.665387f, 0.672443f, 0.679543f, 0.686685f, 0.693872f, 0.701102f, 0.708376f, + 0.715694f, 0.723055f, 0.730461f, 0.737911f, 0.745404f, 0.752942f, 0.760525f, 0.768151f, 0.775822f, 0.783538f, 0.791298f, + 0.799103f, 0.806952f, 0.814847f, 0.822786f, 0.830770f, 0.838799f, 0.846873f, 0.854993f, 0.863157f, 0.871367f, 0.879622f, + 0.887923f, 0.896269f, 0.904661f, 0.913099f, 0.921582f, 0.930111f, 0.938686f, 0.947307f, 0.955974f, 0.964686f, 0.973445f, + 0.982251f, 0.991102f, 1.0f +}; + +typedef union +{ + unsigned int u; + float f; +} stbir__FP32; + +// From https://gist.github.com/rygorous/2203834 + +static const stbir_uint32 fp32_to_srgb8_tab4[104] = { + 0x0073000d, 0x007a000d, 0x0080000d, 0x0087000d, 0x008d000d, 0x0094000d, 0x009a000d, 0x00a1000d, + 0x00a7001a, 0x00b4001a, 0x00c1001a, 0x00ce001a, 0x00da001a, 0x00e7001a, 0x00f4001a, 0x0101001a, + 0x010e0033, 0x01280033, 0x01410033, 0x015b0033, 0x01750033, 0x018f0033, 0x01a80033, 0x01c20033, + 0x01dc0067, 0x020f0067, 0x02430067, 0x02760067, 0x02aa0067, 0x02dd0067, 0x03110067, 0x03440067, + 0x037800ce, 0x03df00ce, 0x044600ce, 0x04ad00ce, 0x051400ce, 0x057b00c5, 0x05dd00bc, 0x063b00b5, + 0x06970158, 0x07420142, 0x07e30130, 0x087b0120, 0x090b0112, 0x09940106, 0x0a1700fc, 0x0a9500f2, + 0x0b0f01cb, 0x0bf401ae, 0x0ccb0195, 0x0d950180, 0x0e56016e, 0x0f0d015e, 0x0fbc0150, 0x10630143, + 0x11070264, 0x1238023e, 0x1357021d, 0x14660201, 0x156601e9, 0x165a01d3, 0x174401c0, 0x182401af, + 0x18fe0331, 0x1a9602fe, 0x1c1502d2, 0x1d7e02ad, 0x1ed4028d, 0x201a0270, 0x21520256, 0x227d0240, + 0x239f0443, 0x25c003fe, 0x27bf03c4, 0x29a10392, 0x2b6a0367, 0x2d1d0341, 0x2ebe031f, 0x304d0300, + 0x31d105b0, 0x34a80555, 0x37520507, 0x39d504c5, 0x3c37048b, 0x3e7c0458, 0x40a8042a, 0x42bd0401, + 0x44c20798, 0x488e071e, 0x4c1c06b6, 0x4f76065d, 0x52a50610, 0x55ac05cc, 0x5892058f, 0x5b590559, + 0x5e0c0a23, 0x631c0980, 0x67db08f6, 0x6c55087f, 0x70940818, 0x74a007bd, 0x787d076c, 0x7c330723, +}; + +static stbir__inline stbir_uint8 stbir__linear_to_srgb_uchar(float in) +{ + static const stbir__FP32 almostone = { 0x3f7fffff }; // 1-eps + static const stbir__FP32 minval = { (127-13) << 23 }; + stbir_uint32 tab,bias,scale,t; + stbir__FP32 f; + + // Clamp to [2^(-13), 1-eps]; these two values map to 0 and 1, respectively. + // The tests are carefully written so that NaNs map to 0, same as in the reference + // implementation. + if (!(in > minval.f)) // written this way to catch NaNs + return 0; + if (in > almostone.f) + return 255; + + // Do the table lookup and unpack bias, scale + f.f = in; + tab = fp32_to_srgb8_tab4[(f.u - minval.u) >> 20]; + bias = (tab >> 16) << 9; + scale = tab & 0xffff; + + // Grab next-highest mantissa bits and perform linear interpolation + t = (f.u >> 12) & 0xff; + return (unsigned char) ((bias + scale*t) >> 16); +} + +#ifndef STBIR_FORCE_GATHER_FILTER_SCANLINES_AMOUNT +#define STBIR_FORCE_GATHER_FILTER_SCANLINES_AMOUNT 32 // when downsampling and <= 32 scanlines of buffering, use gather. gather used down to 1/8th scaling for 25% win. +#endif + +#ifndef STBIR_FORCE_MINIMUM_SCANLINES_FOR_SPLITS +#define STBIR_FORCE_MINIMUM_SCANLINES_FOR_SPLITS 4 // when threading, what is the minimum number of scanlines for a split? +#endif + +// restrict pointers for the output pointers, other loop and unroll control +#if defined( _MSC_VER ) && !defined(__clang__) + #define STBIR_STREAMOUT_PTR( star ) star __restrict + #define STBIR_NO_UNROLL( ptr ) __assume(ptr) // this oddly keeps msvc from unrolling a loop + #if _MSC_VER >= 1900 + #define STBIR_NO_UNROLL_LOOP_START __pragma(loop( no_vector )) + #else + #define STBIR_NO_UNROLL_LOOP_START + #endif +#elif defined( __clang__ ) + #define STBIR_STREAMOUT_PTR( star ) star __restrict__ + #define STBIR_NO_UNROLL( ptr ) __asm__ (""::"r"(ptr)) + #if ( __clang_major__ >= 4 ) || ( ( __clang_major__ >= 3 ) && ( __clang_minor__ >= 5 ) ) + #define STBIR_NO_UNROLL_LOOP_START _Pragma("clang loop unroll(disable)") _Pragma("clang loop vectorize(disable)") + #else + #define STBIR_NO_UNROLL_LOOP_START + #endif +#elif defined( __GNUC__ ) + #define STBIR_STREAMOUT_PTR( star ) star __restrict__ + #define STBIR_NO_UNROLL( ptr ) __asm__ (""::"r"(ptr)) + #if __GNUC__ >= 14 + #define STBIR_NO_UNROLL_LOOP_START _Pragma("GCC unroll 0") _Pragma("GCC novector") + #else + #define STBIR_NO_UNROLL_LOOP_START + #endif + #define STBIR_NO_UNROLL_LOOP_START_INF_FOR +#else + #define STBIR_STREAMOUT_PTR( star ) star + #define STBIR_NO_UNROLL( ptr ) + #define STBIR_NO_UNROLL_LOOP_START +#endif + +#ifndef STBIR_NO_UNROLL_LOOP_START_INF_FOR +#define STBIR_NO_UNROLL_LOOP_START_INF_FOR STBIR_NO_UNROLL_LOOP_START +#endif + +#ifdef STBIR_NO_SIMD // force simd off for whatever reason + +// force simd off overrides everything else, so clear it all + +#ifdef STBIR_SSE2 +#undef STBIR_SSE2 +#endif + +#ifdef STBIR_AVX +#undef STBIR_AVX +#endif + +#ifdef STBIR_NEON +#undef STBIR_NEON +#endif + +#ifdef STBIR_AVX2 +#undef STBIR_AVX2 +#endif + +#ifdef STBIR_FP16C +#undef STBIR_FP16C +#endif + +#ifdef STBIR_WASM +#undef STBIR_WASM +#endif + +#ifdef STBIR_SIMD +#undef STBIR_SIMD +#endif + +#else // STBIR_SIMD + +#ifdef STBIR_SSE2 + #include <emmintrin.h> + + #define stbir__simdf __m128 + #define stbir__simdi __m128i + + #define stbir_simdi_castf( reg ) _mm_castps_si128(reg) + #define stbir_simdf_casti( reg ) _mm_castsi128_ps(reg) + + #define stbir__simdf_load( reg, ptr ) (reg) = _mm_loadu_ps( (float const*)(ptr) ) + #define stbir__simdi_load( reg, ptr ) (reg) = _mm_loadu_si128 ( (stbir__simdi const*)(ptr) ) + #define stbir__simdf_load1( out, ptr ) (out) = _mm_load_ss( (float const*)(ptr) ) // top values can be random (not denormal or nan for perf) + #define stbir__simdi_load1( out, ptr ) (out) = _mm_castps_si128( _mm_load_ss( (float const*)(ptr) )) + #define stbir__simdf_load1z( out, ptr ) (out) = _mm_load_ss( (float const*)(ptr) ) // top values must be zero + #define stbir__simdf_frep4( fvar ) _mm_set_ps1( fvar ) + #define stbir__simdf_load1frep4( out, fvar ) (out) = _mm_set_ps1( fvar ) + #define stbir__simdf_load2( out, ptr ) (out) = _mm_castsi128_ps( _mm_loadl_epi64( (__m128i*)(ptr)) ) // top values can be random (not denormal or nan for perf) + #define stbir__simdf_load2z( out, ptr ) (out) = _mm_castsi128_ps( _mm_loadl_epi64( (__m128i*)(ptr)) ) // top values must be zero + #define stbir__simdf_load2hmerge( out, reg, ptr ) (out) = _mm_castpd_ps(_mm_loadh_pd( _mm_castps_pd(reg), (double*)(ptr) )) + + #define stbir__simdf_zeroP() _mm_setzero_ps() + #define stbir__simdf_zero( reg ) (reg) = _mm_setzero_ps() + + #define stbir__simdf_store( ptr, reg ) _mm_storeu_ps( (float*)(ptr), reg ) + #define stbir__simdf_store1( ptr, reg ) _mm_store_ss( (float*)(ptr), reg ) + #define stbir__simdf_store2( ptr, reg ) _mm_storel_epi64( (__m128i*)(ptr), _mm_castps_si128(reg) ) + #define stbir__simdf_store2h( ptr, reg ) _mm_storeh_pd( (double*)(ptr), _mm_castps_pd(reg) ) + + #define stbir__simdi_store( ptr, reg ) _mm_storeu_si128( (__m128i*)(ptr), reg ) + #define stbir__simdi_store1( ptr, reg ) _mm_store_ss( (float*)(ptr), _mm_castsi128_ps(reg) ) + #define stbir__simdi_store2( ptr, reg ) _mm_storel_epi64( (__m128i*)(ptr), (reg) ) + + #define stbir__prefetch( ptr ) _mm_prefetch((char*)(ptr), _MM_HINT_T0 ) + + #define stbir__simdi_expand_u8_to_u32(out0,out1,out2,out3,ireg) \ + { \ + stbir__simdi zero = _mm_setzero_si128(); \ + out2 = _mm_unpacklo_epi8( ireg, zero ); \ + out3 = _mm_unpackhi_epi8( ireg, zero ); \ + out0 = _mm_unpacklo_epi16( out2, zero ); \ + out1 = _mm_unpackhi_epi16( out2, zero ); \ + out2 = _mm_unpacklo_epi16( out3, zero ); \ + out3 = _mm_unpackhi_epi16( out3, zero ); \ + } + +#define stbir__simdi_expand_u8_to_1u32(out,ireg) \ + { \ + stbir__simdi zero = _mm_setzero_si128(); \ + out = _mm_unpacklo_epi8( ireg, zero ); \ + out = _mm_unpacklo_epi16( out, zero ); \ + } + + #define stbir__simdi_expand_u16_to_u32(out0,out1,ireg) \ + { \ + stbir__simdi zero = _mm_setzero_si128(); \ + out0 = _mm_unpacklo_epi16( ireg, zero ); \ + out1 = _mm_unpackhi_epi16( ireg, zero ); \ + } + + #define stbir__simdf_convert_float_to_i32( i, f ) (i) = _mm_cvttps_epi32(f) + #define stbir__simdf_convert_float_to_int( f ) _mm_cvtt_ss2si(f) + #define stbir__simdf_convert_float_to_uint8( f ) ((unsigned char)_mm_cvtsi128_si32(_mm_cvttps_epi32(_mm_max_ps(_mm_min_ps(f,STBIR__CONSTF(STBIR_max_uint8_as_float)),_mm_setzero_ps())))) + #define stbir__simdf_convert_float_to_short( f ) ((unsigned short)_mm_cvtsi128_si32(_mm_cvttps_epi32(_mm_max_ps(_mm_min_ps(f,STBIR__CONSTF(STBIR_max_uint16_as_float)),_mm_setzero_ps())))) + + #define stbir__simdi_to_int( i ) _mm_cvtsi128_si32(i) + #define stbir__simdi_convert_i32_to_float(out, ireg) (out) = _mm_cvtepi32_ps( ireg ) + #define stbir__simdf_add( out, reg0, reg1 ) (out) = _mm_add_ps( reg0, reg1 ) + #define stbir__simdf_mult( out, reg0, reg1 ) (out) = _mm_mul_ps( reg0, reg1 ) + #define stbir__simdf_mult_mem( out, reg, ptr ) (out) = _mm_mul_ps( reg, _mm_loadu_ps( (float const*)(ptr) ) ) + #define stbir__simdf_mult1_mem( out, reg, ptr ) (out) = _mm_mul_ss( reg, _mm_load_ss( (float const*)(ptr) ) ) + #define stbir__simdf_add_mem( out, reg, ptr ) (out) = _mm_add_ps( reg, _mm_loadu_ps( (float const*)(ptr) ) ) + #define stbir__simdf_add1_mem( out, reg, ptr ) (out) = _mm_add_ss( reg, _mm_load_ss( (float const*)(ptr) ) ) + + #ifdef STBIR_USE_FMA // not on by default to maintain bit identical simd to non-simd + #include <immintrin.h> + #define stbir__simdf_madd( out, add, mul1, mul2 ) (out) = _mm_fmadd_ps( mul1, mul2, add ) + #define stbir__simdf_madd1( out, add, mul1, mul2 ) (out) = _mm_fmadd_ss( mul1, mul2, add ) + #define stbir__simdf_madd_mem( out, add, mul, ptr ) (out) = _mm_fmadd_ps( mul, _mm_loadu_ps( (float const*)(ptr) ), add ) + #define stbir__simdf_madd1_mem( out, add, mul, ptr ) (out) = _mm_fmadd_ss( mul, _mm_load_ss( (float const*)(ptr) ), add ) + #else + #define stbir__simdf_madd( out, add, mul1, mul2 ) (out) = _mm_add_ps( add, _mm_mul_ps( mul1, mul2 ) ) + #define stbir__simdf_madd1( out, add, mul1, mul2 ) (out) = _mm_add_ss( add, _mm_mul_ss( mul1, mul2 ) ) + #define stbir__simdf_madd_mem( out, add, mul, ptr ) (out) = _mm_add_ps( add, _mm_mul_ps( mul, _mm_loadu_ps( (float const*)(ptr) ) ) ) + #define stbir__simdf_madd1_mem( out, add, mul, ptr ) (out) = _mm_add_ss( add, _mm_mul_ss( mul, _mm_load_ss( (float const*)(ptr) ) ) ) + #endif + + #define stbir__simdf_add1( out, reg0, reg1 ) (out) = _mm_add_ss( reg0, reg1 ) + #define stbir__simdf_mult1( out, reg0, reg1 ) (out) = _mm_mul_ss( reg0, reg1 ) + + #define stbir__simdf_and( out, reg0, reg1 ) (out) = _mm_and_ps( reg0, reg1 ) + #define stbir__simdf_or( out, reg0, reg1 ) (out) = _mm_or_ps( reg0, reg1 ) + + #define stbir__simdf_min( out, reg0, reg1 ) (out) = _mm_min_ps( reg0, reg1 ) + #define stbir__simdf_max( out, reg0, reg1 ) (out) = _mm_max_ps( reg0, reg1 ) + #define stbir__simdf_min1( out, reg0, reg1 ) (out) = _mm_min_ss( reg0, reg1 ) + #define stbir__simdf_max1( out, reg0, reg1 ) (out) = _mm_max_ss( reg0, reg1 ) + + #define stbir__simdf_0123ABCDto3ABx( out, reg0, reg1 ) (out)=_mm_castsi128_ps( _mm_shuffle_epi32( _mm_castps_si128( _mm_shuffle_ps( reg1,reg0, (0<<0) + (1<<2) + (2<<4) + (3<<6) )), (3<<0) + (0<<2) + (1<<4) + (2<<6) ) ) + #define stbir__simdf_0123ABCDto23Ax( out, reg0, reg1 ) (out)=_mm_castsi128_ps( _mm_shuffle_epi32( _mm_castps_si128( _mm_shuffle_ps( reg1,reg0, (0<<0) + (1<<2) + (2<<4) + (3<<6) )), (2<<0) + (3<<2) + (0<<4) + (1<<6) ) ) + + static const stbir__simdf STBIR_zeroones = { 0.0f,1.0f,0.0f,1.0f }; + static const stbir__simdf STBIR_onezeros = { 1.0f,0.0f,1.0f,0.0f }; + #define stbir__simdf_aaa1( out, alp, ones ) (out)=_mm_castsi128_ps( _mm_shuffle_epi32( _mm_castps_si128( _mm_movehl_ps( ones, alp ) ), (1<<0) + (1<<2) + (1<<4) + (2<<6) ) ) + #define stbir__simdf_1aaa( out, alp, ones ) (out)=_mm_castsi128_ps( _mm_shuffle_epi32( _mm_castps_si128( _mm_movelh_ps( ones, alp ) ), (0<<0) + (2<<2) + (2<<4) + (2<<6) ) ) + #define stbir__simdf_a1a1( out, alp, ones) (out) = _mm_or_ps( _mm_castsi128_ps( _mm_srli_epi64( _mm_castps_si128(alp), 32 ) ), STBIR_zeroones ) + #define stbir__simdf_1a1a( out, alp, ones) (out) = _mm_or_ps( _mm_castsi128_ps( _mm_slli_epi64( _mm_castps_si128(alp), 32 ) ), STBIR_onezeros ) + + #define stbir__simdf_swiz( reg, one, two, three, four ) _mm_castsi128_ps( _mm_shuffle_epi32( _mm_castps_si128( reg ), (one<<0) + (two<<2) + (three<<4) + (four<<6) ) ) + + #define stbir__simdi_and( out, reg0, reg1 ) (out) = _mm_and_si128( reg0, reg1 ) + #define stbir__simdi_or( out, reg0, reg1 ) (out) = _mm_or_si128( reg0, reg1 ) + #define stbir__simdi_16madd( out, reg0, reg1 ) (out) = _mm_madd_epi16( reg0, reg1 ) + + #define stbir__simdf_pack_to_8bytes(out,aa,bb) \ + { \ + stbir__simdf af,bf; \ + stbir__simdi a,b; \ + af = _mm_min_ps( aa, STBIR_max_uint8_as_float ); \ + bf = _mm_min_ps( bb, STBIR_max_uint8_as_float ); \ + af = _mm_max_ps( af, _mm_setzero_ps() ); \ + bf = _mm_max_ps( bf, _mm_setzero_ps() ); \ + a = _mm_cvttps_epi32( af ); \ + b = _mm_cvttps_epi32( bf ); \ + a = _mm_packs_epi32( a, b ); \ + out = _mm_packus_epi16( a, a ); \ + } + + #define stbir__simdf_load4_transposed( o0, o1, o2, o3, ptr ) \ + stbir__simdf_load( o0, (ptr) ); \ + stbir__simdf_load( o1, (ptr)+4 ); \ + stbir__simdf_load( o2, (ptr)+8 ); \ + stbir__simdf_load( o3, (ptr)+12 ); \ + { \ + __m128 tmp0, tmp1, tmp2, tmp3; \ + tmp0 = _mm_unpacklo_ps(o0, o1); \ + tmp2 = _mm_unpacklo_ps(o2, o3); \ + tmp1 = _mm_unpackhi_ps(o0, o1); \ + tmp3 = _mm_unpackhi_ps(o2, o3); \ + o0 = _mm_movelh_ps(tmp0, tmp2); \ + o1 = _mm_movehl_ps(tmp2, tmp0); \ + o2 = _mm_movelh_ps(tmp1, tmp3); \ + o3 = _mm_movehl_ps(tmp3, tmp1); \ + } + + #define stbir__interleave_pack_and_store_16_u8( ptr, r0, r1, r2, r3 ) \ + r0 = _mm_packs_epi32( r0, r1 ); \ + r2 = _mm_packs_epi32( r2, r3 ); \ + r1 = _mm_unpacklo_epi16( r0, r2 ); \ + r3 = _mm_unpackhi_epi16( r0, r2 ); \ + r0 = _mm_unpacklo_epi16( r1, r3 ); \ + r2 = _mm_unpackhi_epi16( r1, r3 ); \ + r0 = _mm_packus_epi16( r0, r2 ); \ + stbir__simdi_store( ptr, r0 ); \ + + #define stbir__simdi_32shr( out, reg, imm ) out = _mm_srli_epi32( reg, imm ) + + #if defined(_MSC_VER) && !defined(__clang__) + // msvc inits with 8 bytes + #define STBIR__CONST_32_TO_8( v ) (char)(unsigned char)((v)&255),(char)(unsigned char)(((v)>>8)&255),(char)(unsigned char)(((v)>>16)&255),(char)(unsigned char)(((v)>>24)&255) + #define STBIR__CONST_4_32i( v ) STBIR__CONST_32_TO_8( v ), STBIR__CONST_32_TO_8( v ), STBIR__CONST_32_TO_8( v ), STBIR__CONST_32_TO_8( v ) + #define STBIR__CONST_4d_32i( v0, v1, v2, v3 ) STBIR__CONST_32_TO_8( v0 ), STBIR__CONST_32_TO_8( v1 ), STBIR__CONST_32_TO_8( v2 ), STBIR__CONST_32_TO_8( v3 ) + #else + // everything else inits with long long's + #define STBIR__CONST_4_32i( v ) (long long)((((stbir_uint64)(stbir_uint32)(v))<<32)|((stbir_uint64)(stbir_uint32)(v))),(long long)((((stbir_uint64)(stbir_uint32)(v))<<32)|((stbir_uint64)(stbir_uint32)(v))) + #define STBIR__CONST_4d_32i( v0, v1, v2, v3 ) (long long)((((stbir_uint64)(stbir_uint32)(v1))<<32)|((stbir_uint64)(stbir_uint32)(v0))),(long long)((((stbir_uint64)(stbir_uint32)(v3))<<32)|((stbir_uint64)(stbir_uint32)(v2))) + #endif + + #define STBIR__SIMDF_CONST(var, x) stbir__simdf var = { x, x, x, x } + #define STBIR__SIMDI_CONST(var, x) stbir__simdi var = { STBIR__CONST_4_32i(x) } + #define STBIR__CONSTF(var) (var) + #define STBIR__CONSTI(var) (var) + + #if defined(STBIR_AVX) || defined(__SSE4_1__) + #include <smmintrin.h> + #define stbir__simdf_pack_to_8words(out,reg0,reg1) out = _mm_packus_epi32(_mm_cvttps_epi32(_mm_max_ps(_mm_min_ps(reg0,STBIR__CONSTF(STBIR_max_uint16_as_float)),_mm_setzero_ps())), _mm_cvttps_epi32(_mm_max_ps(_mm_min_ps(reg1,STBIR__CONSTF(STBIR_max_uint16_as_float)),_mm_setzero_ps()))) + #else + STBIR__SIMDI_CONST(stbir__s32_32768, 32768); + STBIR__SIMDI_CONST(stbir__s16_32768, ((32768<<16)|32768)); + + #define stbir__simdf_pack_to_8words(out,reg0,reg1) \ + { \ + stbir__simdi tmp0,tmp1; \ + tmp0 = _mm_cvttps_epi32(_mm_max_ps(_mm_min_ps(reg0,STBIR__CONSTF(STBIR_max_uint16_as_float)),_mm_setzero_ps())); \ + tmp1 = _mm_cvttps_epi32(_mm_max_ps(_mm_min_ps(reg1,STBIR__CONSTF(STBIR_max_uint16_as_float)),_mm_setzero_ps())); \ + tmp0 = _mm_sub_epi32( tmp0, stbir__s32_32768 ); \ + tmp1 = _mm_sub_epi32( tmp1, stbir__s32_32768 ); \ + out = _mm_packs_epi32( tmp0, tmp1 ); \ + out = _mm_sub_epi16( out, stbir__s16_32768 ); \ + } + + #endif + + #define STBIR_SIMD + + // if we detect AVX, set the simd8 defines + #ifdef STBIR_AVX + #include <immintrin.h> + #define STBIR_SIMD8 + #define stbir__simdf8 __m256 + #define stbir__simdi8 __m256i + #define stbir__simdf8_load( out, ptr ) (out) = _mm256_loadu_ps( (float const *)(ptr) ) + #define stbir__simdi8_load( out, ptr ) (out) = _mm256_loadu_si256( (__m256i const *)(ptr) ) + #define stbir__simdf8_mult( out, a, b ) (out) = _mm256_mul_ps( (a), (b) ) + #define stbir__simdf8_store( ptr, out ) _mm256_storeu_ps( (float*)(ptr), out ) + #define stbir__simdi8_store( ptr, reg ) _mm256_storeu_si256( (__m256i*)(ptr), reg ) + #define stbir__simdf8_frep8( fval ) _mm256_set1_ps( fval ) + + #define stbir__simdf8_min( out, reg0, reg1 ) (out) = _mm256_min_ps( reg0, reg1 ) + #define stbir__simdf8_max( out, reg0, reg1 ) (out) = _mm256_max_ps( reg0, reg1 ) + + #define stbir__simdf8_add4halves( out, bot4, top8 ) (out) = _mm_add_ps( bot4, _mm256_extractf128_ps( top8, 1 ) ) + #define stbir__simdf8_mult_mem( out, reg, ptr ) (out) = _mm256_mul_ps( reg, _mm256_loadu_ps( (float const*)(ptr) ) ) + #define stbir__simdf8_add_mem( out, reg, ptr ) (out) = _mm256_add_ps( reg, _mm256_loadu_ps( (float const*)(ptr) ) ) + #define stbir__simdf8_add( out, a, b ) (out) = _mm256_add_ps( a, b ) + #define stbir__simdf8_load1b( out, ptr ) (out) = _mm256_broadcast_ss( ptr ) + #define stbir__simdf_load1rep4( out, ptr ) (out) = _mm_broadcast_ss( ptr ) // avx load instruction + + #define stbir__simdi8_convert_i32_to_float(out, ireg) (out) = _mm256_cvtepi32_ps( ireg ) + #define stbir__simdf8_convert_float_to_i32( i, f ) (i) = _mm256_cvttps_epi32(f) + + #define stbir__simdf8_bot4s( out, a, b ) (out) = _mm256_permute2f128_ps(a,b, (0<<0)+(2<<4) ) + #define stbir__simdf8_top4s( out, a, b ) (out) = _mm256_permute2f128_ps(a,b, (1<<0)+(3<<4) ) + + #define stbir__simdf8_gettop4( reg ) _mm256_extractf128_ps(reg,1) + + #ifdef STBIR_AVX2 + + #define stbir__simdi8_expand_u8_to_u32(out0,out1,ireg) \ + { \ + stbir__simdi8 a, zero =_mm256_setzero_si256();\ + a = _mm256_permute4x64_epi64( _mm256_unpacklo_epi8( _mm256_permute4x64_epi64(_mm256_castsi128_si256(ireg),(0<<0)+(2<<2)+(1<<4)+(3<<6)), zero ),(0<<0)+(2<<2)+(1<<4)+(3<<6)); \ + out0 = _mm256_unpacklo_epi16( a, zero ); \ + out1 = _mm256_unpackhi_epi16( a, zero ); \ + } + + #define stbir__simdf8_pack_to_16bytes(out,aa,bb) \ + { \ + stbir__simdi8 t; \ + stbir__simdf8 af,bf; \ + stbir__simdi8 a,b; \ + af = _mm256_min_ps( aa, STBIR_max_uint8_as_floatX ); \ + bf = _mm256_min_ps( bb, STBIR_max_uint8_as_floatX ); \ + af = _mm256_max_ps( af, _mm256_setzero_ps() ); \ + bf = _mm256_max_ps( bf, _mm256_setzero_ps() ); \ + a = _mm256_cvttps_epi32( af ); \ + b = _mm256_cvttps_epi32( bf ); \ + t = _mm256_permute4x64_epi64( _mm256_packs_epi32( a, b ), (0<<0)+(2<<2)+(1<<4)+(3<<6) ); \ + out = _mm256_castsi256_si128( _mm256_permute4x64_epi64( _mm256_packus_epi16( t, t ), (0<<0)+(2<<2)+(1<<4)+(3<<6) ) ); \ + } + + #define stbir__simdi8_expand_u16_to_u32(out,ireg) out = _mm256_unpacklo_epi16( _mm256_permute4x64_epi64(_mm256_castsi128_si256(ireg),(0<<0)+(2<<2)+(1<<4)+(3<<6)), _mm256_setzero_si256() ); + + #define stbir__simdf8_pack_to_16words(out,aa,bb) \ + { \ + stbir__simdf8 af,bf; \ + stbir__simdi8 a,b; \ + af = _mm256_min_ps( aa, STBIR_max_uint16_as_floatX ); \ + bf = _mm256_min_ps( bb, STBIR_max_uint16_as_floatX ); \ + af = _mm256_max_ps( af, _mm256_setzero_ps() ); \ + bf = _mm256_max_ps( bf, _mm256_setzero_ps() ); \ + a = _mm256_cvttps_epi32( af ); \ + b = _mm256_cvttps_epi32( bf ); \ + (out) = _mm256_permute4x64_epi64( _mm256_packus_epi32(a, b), (0<<0)+(2<<2)+(1<<4)+(3<<6) ); \ + } + + #else + + #define stbir__simdi8_expand_u8_to_u32(out0,out1,ireg) \ + { \ + stbir__simdi a,zero = _mm_setzero_si128(); \ + a = _mm_unpacklo_epi8( ireg, zero ); \ + out0 = _mm256_setr_m128i( _mm_unpacklo_epi16( a, zero ), _mm_unpackhi_epi16( a, zero ) ); \ + a = _mm_unpackhi_epi8( ireg, zero ); \ + out1 = _mm256_setr_m128i( _mm_unpacklo_epi16( a, zero ), _mm_unpackhi_epi16( a, zero ) ); \ + } + + #define stbir__simdf8_pack_to_16bytes(out,aa,bb) \ + { \ + stbir__simdi t; \ + stbir__simdf8 af,bf; \ + stbir__simdi8 a,b; \ + af = _mm256_min_ps( aa, STBIR_max_uint8_as_floatX ); \ + bf = _mm256_min_ps( bb, STBIR_max_uint8_as_floatX ); \ + af = _mm256_max_ps( af, _mm256_setzero_ps() ); \ + bf = _mm256_max_ps( bf, _mm256_setzero_ps() ); \ + a = _mm256_cvttps_epi32( af ); \ + b = _mm256_cvttps_epi32( bf ); \ + out = _mm_packs_epi32( _mm256_castsi256_si128(a), _mm256_extractf128_si256( a, 1 ) ); \ + out = _mm_packus_epi16( out, out ); \ + t = _mm_packs_epi32( _mm256_castsi256_si128(b), _mm256_extractf128_si256( b, 1 ) ); \ + t = _mm_packus_epi16( t, t ); \ + out = _mm_castps_si128( _mm_shuffle_ps( _mm_castsi128_ps(out), _mm_castsi128_ps(t), (0<<0)+(1<<2)+(0<<4)+(1<<6) ) ); \ + } + + #define stbir__simdi8_expand_u16_to_u32(out,ireg) \ + { \ + stbir__simdi a,b,zero = _mm_setzero_si128(); \ + a = _mm_unpacklo_epi16( ireg, zero ); \ + b = _mm_unpackhi_epi16( ireg, zero ); \ + out = _mm256_insertf128_si256( _mm256_castsi128_si256( a ), b, 1 ); \ + } + + #define stbir__simdf8_pack_to_16words(out,aa,bb) \ + { \ + stbir__simdi t0,t1; \ + stbir__simdf8 af,bf; \ + stbir__simdi8 a,b; \ + af = _mm256_min_ps( aa, STBIR_max_uint16_as_floatX ); \ + bf = _mm256_min_ps( bb, STBIR_max_uint16_as_floatX ); \ + af = _mm256_max_ps( af, _mm256_setzero_ps() ); \ + bf = _mm256_max_ps( bf, _mm256_setzero_ps() ); \ + a = _mm256_cvttps_epi32( af ); \ + b = _mm256_cvttps_epi32( bf ); \ + t0 = _mm_packus_epi32( _mm256_castsi256_si128(a), _mm256_extractf128_si256( a, 1 ) ); \ + t1 = _mm_packus_epi32( _mm256_castsi256_si128(b), _mm256_extractf128_si256( b, 1 ) ); \ + out = _mm256_setr_m128i( t0, t1 ); \ + } + + #endif + + static __m256i stbir_00001111 = { STBIR__CONST_4d_32i( 0, 0, 0, 0 ), STBIR__CONST_4d_32i( 1, 1, 1, 1 ) }; + #define stbir__simdf8_0123to00001111( out, in ) (out) = _mm256_permutevar_ps ( in, stbir_00001111 ) + + static __m256i stbir_22223333 = { STBIR__CONST_4d_32i( 2, 2, 2, 2 ), STBIR__CONST_4d_32i( 3, 3, 3, 3 ) }; + #define stbir__simdf8_0123to22223333( out, in ) (out) = _mm256_permutevar_ps ( in, stbir_22223333 ) + + #define stbir__simdf8_0123to2222( out, in ) (out) = stbir__simdf_swiz(_mm256_castps256_ps128(in), 2,2,2,2 ) + + #define stbir__simdf8_load4b( out, ptr ) (out) = _mm256_broadcast_ps( (__m128 const *)(ptr) ) + + static __m256i stbir_00112233 = { STBIR__CONST_4d_32i( 0, 0, 1, 1 ), STBIR__CONST_4d_32i( 2, 2, 3, 3 ) }; + #define stbir__simdf8_0123to00112233( out, in ) (out) = _mm256_permutevar_ps ( in, stbir_00112233 ) + #define stbir__simdf8_add4( out, a8, b ) (out) = _mm256_add_ps( a8, _mm256_castps128_ps256( b ) ) + + static __m256i stbir_load6 = { STBIR__CONST_4_32i( 0x80000000 ), STBIR__CONST_4d_32i( 0x80000000, 0x80000000, 0, 0 ) }; + #define stbir__simdf8_load6z( out, ptr ) (out) = _mm256_maskload_ps( ptr, stbir_load6 ) + + #define stbir__simdf8_0123to00000000( out, in ) (out) = _mm256_shuffle_ps ( in, in, (0<<0)+(0<<2)+(0<<4)+(0<<6) ) + #define stbir__simdf8_0123to11111111( out, in ) (out) = _mm256_shuffle_ps ( in, in, (1<<0)+(1<<2)+(1<<4)+(1<<6) ) + #define stbir__simdf8_0123to22222222( out, in ) (out) = _mm256_shuffle_ps ( in, in, (2<<0)+(2<<2)+(2<<4)+(2<<6) ) + #define stbir__simdf8_0123to33333333( out, in ) (out) = _mm256_shuffle_ps ( in, in, (3<<0)+(3<<2)+(3<<4)+(3<<6) ) + #define stbir__simdf8_0123to21032103( out, in ) (out) = _mm256_shuffle_ps ( in, in, (2<<0)+(1<<2)+(0<<4)+(3<<6) ) + #define stbir__simdf8_0123to32103210( out, in ) (out) = _mm256_shuffle_ps ( in, in, (3<<0)+(2<<2)+(1<<4)+(0<<6) ) + #define stbir__simdf8_0123to12301230( out, in ) (out) = _mm256_shuffle_ps ( in, in, (1<<0)+(2<<2)+(3<<4)+(0<<6) ) + #define stbir__simdf8_0123to10321032( out, in ) (out) = _mm256_shuffle_ps ( in, in, (1<<0)+(0<<2)+(3<<4)+(2<<6) ) + #define stbir__simdf8_0123to30123012( out, in ) (out) = _mm256_shuffle_ps ( in, in, (3<<0)+(0<<2)+(1<<4)+(2<<6) ) + + #define stbir__simdf8_0123to11331133( out, in ) (out) = _mm256_shuffle_ps ( in, in, (1<<0)+(1<<2)+(3<<4)+(3<<6) ) + #define stbir__simdf8_0123to00220022( out, in ) (out) = _mm256_shuffle_ps ( in, in, (0<<0)+(0<<2)+(2<<4)+(2<<6) ) + + #define stbir__simdf8_aaa1( out, alp, ones ) (out) = _mm256_blend_ps( alp, ones, (1<<0)+(1<<1)+(1<<2)+(0<<3)+(1<<4)+(1<<5)+(1<<6)+(0<<7)); (out)=_mm256_shuffle_ps( out,out, (3<<0) + (3<<2) + (3<<4) + (0<<6) ) + #define stbir__simdf8_1aaa( out, alp, ones ) (out) = _mm256_blend_ps( alp, ones, (0<<0)+(1<<1)+(1<<2)+(1<<3)+(0<<4)+(1<<5)+(1<<6)+(1<<7)); (out)=_mm256_shuffle_ps( out,out, (1<<0) + (0<<2) + (0<<4) + (0<<6) ) + #define stbir__simdf8_a1a1( out, alp, ones) (out) = _mm256_blend_ps( alp, ones, (1<<0)+(0<<1)+(1<<2)+(0<<3)+(1<<4)+(0<<5)+(1<<6)+(0<<7)); (out)=_mm256_shuffle_ps( out,out, (1<<0) + (0<<2) + (3<<4) + (2<<6) ) + #define stbir__simdf8_1a1a( out, alp, ones) (out) = _mm256_blend_ps( alp, ones, (0<<0)+(1<<1)+(0<<2)+(1<<3)+(0<<4)+(1<<5)+(0<<6)+(1<<7)); (out)=_mm256_shuffle_ps( out,out, (1<<0) + (0<<2) + (3<<4) + (2<<6) ) + + #define stbir__simdf8_zero( reg ) (reg) = _mm256_setzero_ps() + + #ifdef STBIR_USE_FMA // not on by default to maintain bit identical simd to non-simd + #define stbir__simdf8_madd( out, add, mul1, mul2 ) (out) = _mm256_fmadd_ps( mul1, mul2, add ) + #define stbir__simdf8_madd_mem( out, add, mul, ptr ) (out) = _mm256_fmadd_ps( mul, _mm256_loadu_ps( (float const*)(ptr) ), add ) + #define stbir__simdf8_madd_mem4( out, add, mul, ptr )(out) = _mm256_fmadd_ps( _mm256_setr_m128( mul, _mm_setzero_ps() ), _mm256_setr_m128( _mm_loadu_ps( (float const*)(ptr) ), _mm_setzero_ps() ), add ) + #else + #define stbir__simdf8_madd( out, add, mul1, mul2 ) (out) = _mm256_add_ps( add, _mm256_mul_ps( mul1, mul2 ) ) + #define stbir__simdf8_madd_mem( out, add, mul, ptr ) (out) = _mm256_add_ps( add, _mm256_mul_ps( mul, _mm256_loadu_ps( (float const*)(ptr) ) ) ) + #define stbir__simdf8_madd_mem4( out, add, mul, ptr ) (out) = _mm256_add_ps( add, _mm256_setr_m128( _mm_mul_ps( mul, _mm_loadu_ps( (float const*)(ptr) ) ), _mm_setzero_ps() ) ) + #endif + #define stbir__if_simdf8_cast_to_simdf4( val ) _mm256_castps256_ps128( val ) + + #endif + + #ifdef STBIR_FLOORF + #undef STBIR_FLOORF + #endif + #define STBIR_FLOORF stbir_simd_floorf + static stbir__inline float stbir_simd_floorf(float x) // martins floorf + { + #if defined(STBIR_AVX) || defined(__SSE4_1__) || defined(STBIR_SSE41) + __m128 t = _mm_set_ss(x); + return _mm_cvtss_f32( _mm_floor_ss(t, t) ); + #else + __m128 f = _mm_set_ss(x); + __m128 t = _mm_cvtepi32_ps(_mm_cvttps_epi32(f)); + __m128 r = _mm_add_ss(t, _mm_and_ps(_mm_cmplt_ss(f, t), _mm_set_ss(-1.0f))); + return _mm_cvtss_f32(r); + #endif + } + + #ifdef STBIR_CEILF + #undef STBIR_CEILF + #endif + #define STBIR_CEILF stbir_simd_ceilf + static stbir__inline float stbir_simd_ceilf(float x) // martins ceilf + { + #if defined(STBIR_AVX) || defined(__SSE4_1__) || defined(STBIR_SSE41) + __m128 t = _mm_set_ss(x); + return _mm_cvtss_f32( _mm_ceil_ss(t, t) ); + #else + __m128 f = _mm_set_ss(x); + __m128 t = _mm_cvtepi32_ps(_mm_cvttps_epi32(f)); + __m128 r = _mm_add_ss(t, _mm_and_ps(_mm_cmplt_ss(t, f), _mm_set_ss(1.0f))); + return _mm_cvtss_f32(r); + #endif + } + +#elif defined(STBIR_NEON) + + #include <arm_neon.h> + + #define stbir__simdf float32x4_t + #define stbir__simdi uint32x4_t + + #define stbir_simdi_castf( reg ) vreinterpretq_u32_f32(reg) + #define stbir_simdf_casti( reg ) vreinterpretq_f32_u32(reg) + + #define stbir__simdf_load( reg, ptr ) (reg) = vld1q_f32( (float const*)(ptr) ) + #define stbir__simdi_load( reg, ptr ) (reg) = vld1q_u32( (uint32_t const*)(ptr) ) + #define stbir__simdf_load1( out, ptr ) (out) = vld1q_dup_f32( (float const*)(ptr) ) // top values can be random (not denormal or nan for perf) + #define stbir__simdi_load1( out, ptr ) (out) = vld1q_dup_u32( (uint32_t const*)(ptr) ) + #define stbir__simdf_load1z( out, ptr ) (out) = vld1q_lane_f32( (float const*)(ptr), vdupq_n_f32(0), 0 ) // top values must be zero + #define stbir__simdf_frep4( fvar ) vdupq_n_f32( fvar ) + #define stbir__simdf_load1frep4( out, fvar ) (out) = vdupq_n_f32( fvar ) + #define stbir__simdf_load2( out, ptr ) (out) = vcombine_f32( vld1_f32( (float const*)(ptr) ), vcreate_f32(0) ) // top values can be random (not denormal or nan for perf) + #define stbir__simdf_load2z( out, ptr ) (out) = vcombine_f32( vld1_f32( (float const*)(ptr) ), vcreate_f32(0) ) // top values must be zero + #define stbir__simdf_load2hmerge( out, reg, ptr ) (out) = vcombine_f32( vget_low_f32(reg), vld1_f32( (float const*)(ptr) ) ) + + #define stbir__simdf_zeroP() vdupq_n_f32(0) + #define stbir__simdf_zero( reg ) (reg) = vdupq_n_f32(0) + + #define stbir__simdf_store( ptr, reg ) vst1q_f32( (float*)(ptr), reg ) + #define stbir__simdf_store1( ptr, reg ) vst1q_lane_f32( (float*)(ptr), reg, 0) + #define stbir__simdf_store2( ptr, reg ) vst1_f32( (float*)(ptr), vget_low_f32(reg) ) + #define stbir__simdf_store2h( ptr, reg ) vst1_f32( (float*)(ptr), vget_high_f32(reg) ) + + #define stbir__simdi_store( ptr, reg ) vst1q_u32( (uint32_t*)(ptr), reg ) + #define stbir__simdi_store1( ptr, reg ) vst1q_lane_u32( (uint32_t*)(ptr), reg, 0 ) + #define stbir__simdi_store2( ptr, reg ) vst1_u32( (uint32_t*)(ptr), vget_low_u32(reg) ) + + #define stbir__prefetch( ptr ) + + #define stbir__simdi_expand_u8_to_u32(out0,out1,out2,out3,ireg) \ + { \ + uint16x8_t l = vmovl_u8( vget_low_u8 ( vreinterpretq_u8_u32(ireg) ) ); \ + uint16x8_t h = vmovl_u8( vget_high_u8( vreinterpretq_u8_u32(ireg) ) ); \ + out0 = vmovl_u16( vget_low_u16 ( l ) ); \ + out1 = vmovl_u16( vget_high_u16( l ) ); \ + out2 = vmovl_u16( vget_low_u16 ( h ) ); \ + out3 = vmovl_u16( vget_high_u16( h ) ); \ + } + + #define stbir__simdi_expand_u8_to_1u32(out,ireg) \ + { \ + uint16x8_t tmp = vmovl_u8( vget_low_u8( vreinterpretq_u8_u32(ireg) ) ); \ + out = vmovl_u16( vget_low_u16( tmp ) ); \ + } + + #define stbir__simdi_expand_u16_to_u32(out0,out1,ireg) \ + { \ + uint16x8_t tmp = vreinterpretq_u16_u32(ireg); \ + out0 = vmovl_u16( vget_low_u16 ( tmp ) ); \ + out1 = vmovl_u16( vget_high_u16( tmp ) ); \ + } + + #define stbir__simdf_convert_float_to_i32( i, f ) (i) = vreinterpretq_u32_s32( vcvtq_s32_f32(f) ) + #define stbir__simdf_convert_float_to_int( f ) vgetq_lane_s32(vcvtq_s32_f32(f), 0) + #define stbir__simdi_to_int( i ) (int)vgetq_lane_u32(i, 0) + #define stbir__simdf_convert_float_to_uint8( f ) ((unsigned char)vgetq_lane_s32(vcvtq_s32_f32(vmaxq_f32(vminq_f32(f,STBIR__CONSTF(STBIR_max_uint8_as_float)),vdupq_n_f32(0))), 0)) + #define stbir__simdf_convert_float_to_short( f ) ((unsigned short)vgetq_lane_s32(vcvtq_s32_f32(vmaxq_f32(vminq_f32(f,STBIR__CONSTF(STBIR_max_uint16_as_float)),vdupq_n_f32(0))), 0)) + #define stbir__simdi_convert_i32_to_float(out, ireg) (out) = vcvtq_f32_s32( vreinterpretq_s32_u32(ireg) ) + #define stbir__simdf_add( out, reg0, reg1 ) (out) = vaddq_f32( reg0, reg1 ) + #define stbir__simdf_mult( out, reg0, reg1 ) (out) = vmulq_f32( reg0, reg1 ) + #define stbir__simdf_mult_mem( out, reg, ptr ) (out) = vmulq_f32( reg, vld1q_f32( (float const*)(ptr) ) ) + #define stbir__simdf_mult1_mem( out, reg, ptr ) (out) = vmulq_f32( reg, vld1q_dup_f32( (float const*)(ptr) ) ) + #define stbir__simdf_add_mem( out, reg, ptr ) (out) = vaddq_f32( reg, vld1q_f32( (float const*)(ptr) ) ) + #define stbir__simdf_add1_mem( out, reg, ptr ) (out) = vaddq_f32( reg, vld1q_dup_f32( (float const*)(ptr) ) ) + + #ifdef STBIR_USE_FMA // not on by default to maintain bit identical simd to non-simd (and also x64 no madd to arm madd) + #define stbir__simdf_madd( out, add, mul1, mul2 ) (out) = vfmaq_f32( add, mul1, mul2 ) + #define stbir__simdf_madd1( out, add, mul1, mul2 ) (out) = vfmaq_f32( add, mul1, mul2 ) + #define stbir__simdf_madd_mem( out, add, mul, ptr ) (out) = vfmaq_f32( add, mul, vld1q_f32( (float const*)(ptr) ) ) + #define stbir__simdf_madd1_mem( out, add, mul, ptr ) (out) = vfmaq_f32( add, mul, vld1q_dup_f32( (float const*)(ptr) ) ) + #else + #define stbir__simdf_madd( out, add, mul1, mul2 ) (out) = vaddq_f32( add, vmulq_f32( mul1, mul2 ) ) + #define stbir__simdf_madd1( out, add, mul1, mul2 ) (out) = vaddq_f32( add, vmulq_f32( mul1, mul2 ) ) + #define stbir__simdf_madd_mem( out, add, mul, ptr ) (out) = vaddq_f32( add, vmulq_f32( mul, vld1q_f32( (float const*)(ptr) ) ) ) + #define stbir__simdf_madd1_mem( out, add, mul, ptr ) (out) = vaddq_f32( add, vmulq_f32( mul, vld1q_dup_f32( (float const*)(ptr) ) ) ) + #endif + + #define stbir__simdf_add1( out, reg0, reg1 ) (out) = vaddq_f32( reg0, reg1 ) + #define stbir__simdf_mult1( out, reg0, reg1 ) (out) = vmulq_f32( reg0, reg1 ) + + #define stbir__simdf_and( out, reg0, reg1 ) (out) = vreinterpretq_f32_u32( vandq_u32( vreinterpretq_u32_f32(reg0), vreinterpretq_u32_f32(reg1) ) ) + #define stbir__simdf_or( out, reg0, reg1 ) (out) = vreinterpretq_f32_u32( vorrq_u32( vreinterpretq_u32_f32(reg0), vreinterpretq_u32_f32(reg1) ) ) + + #define stbir__simdf_min( out, reg0, reg1 ) (out) = vminq_f32( reg0, reg1 ) + #define stbir__simdf_max( out, reg0, reg1 ) (out) = vmaxq_f32( reg0, reg1 ) + #define stbir__simdf_min1( out, reg0, reg1 ) (out) = vminq_f32( reg0, reg1 ) + #define stbir__simdf_max1( out, reg0, reg1 ) (out) = vmaxq_f32( reg0, reg1 ) + + #define stbir__simdf_0123ABCDto3ABx( out, reg0, reg1 ) (out) = vextq_f32( reg0, reg1, 3 ) + #define stbir__simdf_0123ABCDto23Ax( out, reg0, reg1 ) (out) = vextq_f32( reg0, reg1, 2 ) + + #define stbir__simdf_a1a1( out, alp, ones ) (out) = vzipq_f32(vuzpq_f32(alp, alp).val[1], ones).val[0] + #define stbir__simdf_1a1a( out, alp, ones ) (out) = vzipq_f32(ones, vuzpq_f32(alp, alp).val[0]).val[0] + + #if defined( _M_ARM64 ) || defined( __aarch64__ ) || defined( __arm64__ ) + + #define stbir__simdf_aaa1( out, alp, ones ) (out) = vcopyq_laneq_f32(vdupq_n_f32(vgetq_lane_f32(alp, 3)), 3, ones, 3) + #define stbir__simdf_1aaa( out, alp, ones ) (out) = vcopyq_laneq_f32(vdupq_n_f32(vgetq_lane_f32(alp, 0)), 0, ones, 0) + + #if defined( _MSC_VER ) && !defined(__clang__) + #define stbir_make16(a,b,c,d) vcombine_u8( \ + vcreate_u8( (4*a+0) | ((4*a+1)<<8) | ((4*a+2)<<16) | ((4*a+3)<<24) | \ + ((stbir_uint64)(4*b+0)<<32) | ((stbir_uint64)(4*b+1)<<40) | ((stbir_uint64)(4*b+2)<<48) | ((stbir_uint64)(4*b+3)<<56)), \ + vcreate_u8( (4*c+0) | ((4*c+1)<<8) | ((4*c+2)<<16) | ((4*c+3)<<24) | \ + ((stbir_uint64)(4*d+0)<<32) | ((stbir_uint64)(4*d+1)<<40) | ((stbir_uint64)(4*d+2)<<48) | ((stbir_uint64)(4*d+3)<<56) ) ) + + static stbir__inline uint8x16x2_t stbir_make16x2(float32x4_t rega,float32x4_t regb) + { + uint8x16x2_t r = { vreinterpretq_u8_f32(rega), vreinterpretq_u8_f32(regb) }; + return r; + } + #else + #define stbir_make16(a,b,c,d) (uint8x16_t){4*a+0,4*a+1,4*a+2,4*a+3,4*b+0,4*b+1,4*b+2,4*b+3,4*c+0,4*c+1,4*c+2,4*c+3,4*d+0,4*d+1,4*d+2,4*d+3} + #define stbir_make16x2(a,b) (uint8x16x2_t){{vreinterpretq_u8_f32(a),vreinterpretq_u8_f32(b)}} + #endif + + #define stbir__simdf_swiz( reg, one, two, three, four ) vreinterpretq_f32_u8( vqtbl1q_u8( vreinterpretq_u8_f32(reg), stbir_make16(one, two, three, four) ) ) + #define stbir__simdf_swiz2( rega, regb, one, two, three, four ) vreinterpretq_f32_u8( vqtbl2q_u8( stbir_make16x2(rega,regb), stbir_make16(one, two, three, four) ) ) + + #define stbir__simdi_16madd( out, reg0, reg1 ) \ + { \ + int16x8_t r0 = vreinterpretq_s16_u32(reg0); \ + int16x8_t r1 = vreinterpretq_s16_u32(reg1); \ + int32x4_t tmp0 = vmull_s16( vget_low_s16(r0), vget_low_s16(r1) ); \ + int32x4_t tmp1 = vmull_s16( vget_high_s16(r0), vget_high_s16(r1) ); \ + (out) = vreinterpretq_u32_s32( vpaddq_s32(tmp0, tmp1) ); \ + } + + #else + + #define stbir__simdf_aaa1( out, alp, ones ) (out) = vsetq_lane_f32(1.0f, vdupq_n_f32(vgetq_lane_f32(alp, 3)), 3) + #define stbir__simdf_1aaa( out, alp, ones ) (out) = vsetq_lane_f32(1.0f, vdupq_n_f32(vgetq_lane_f32(alp, 0)), 0) + + #if defined( _MSC_VER ) && !defined(__clang__) + static stbir__inline uint8x8x2_t stbir_make8x2(float32x4_t reg) + { + uint8x8x2_t r = { { vget_low_u8(vreinterpretq_u8_f32(reg)), vget_high_u8(vreinterpretq_u8_f32(reg)) } }; + return r; + } + #define stbir_make8(a,b) vcreate_u8( \ + (4*a+0) | ((4*a+1)<<8) | ((4*a+2)<<16) | ((4*a+3)<<24) | \ + ((stbir_uint64)(4*b+0)<<32) | ((stbir_uint64)(4*b+1)<<40) | ((stbir_uint64)(4*b+2)<<48) | ((stbir_uint64)(4*b+3)<<56) ) + #else + #define stbir_make8x2(reg) (uint8x8x2_t){ { vget_low_u8(vreinterpretq_u8_f32(reg)), vget_high_u8(vreinterpretq_u8_f32(reg)) } } + #define stbir_make8(a,b) (uint8x8_t){4*a+0,4*a+1,4*a+2,4*a+3,4*b+0,4*b+1,4*b+2,4*b+3} + #endif + + #define stbir__simdf_swiz( reg, one, two, three, four ) vreinterpretq_f32_u8( vcombine_u8( \ + vtbl2_u8( stbir_make8x2( reg ), stbir_make8( one, two ) ), \ + vtbl2_u8( stbir_make8x2( reg ), stbir_make8( three, four ) ) ) ) + + #define stbir__simdi_16madd( out, reg0, reg1 ) \ + { \ + int16x8_t r0 = vreinterpretq_s16_u32(reg0); \ + int16x8_t r1 = vreinterpretq_s16_u32(reg1); \ + int32x4_t tmp0 = vmull_s16( vget_low_s16(r0), vget_low_s16(r1) ); \ + int32x4_t tmp1 = vmull_s16( vget_high_s16(r0), vget_high_s16(r1) ); \ + int32x2_t out0 = vpadd_s32( vget_low_s32(tmp0), vget_high_s32(tmp0) ); \ + int32x2_t out1 = vpadd_s32( vget_low_s32(tmp1), vget_high_s32(tmp1) ); \ + (out) = vreinterpretq_u32_s32( vcombine_s32(out0, out1) ); \ + } + + #endif + + #define stbir__simdi_and( out, reg0, reg1 ) (out) = vandq_u32( reg0, reg1 ) + #define stbir__simdi_or( out, reg0, reg1 ) (out) = vorrq_u32( reg0, reg1 ) + + #define stbir__simdf_pack_to_8bytes(out,aa,bb) \ + { \ + float32x4_t af = vmaxq_f32( vminq_f32(aa,STBIR__CONSTF(STBIR_max_uint8_as_float) ), vdupq_n_f32(0) ); \ + float32x4_t bf = vmaxq_f32( vminq_f32(bb,STBIR__CONSTF(STBIR_max_uint8_as_float) ), vdupq_n_f32(0) ); \ + int16x4_t ai = vqmovn_s32( vcvtq_s32_f32( af ) ); \ + int16x4_t bi = vqmovn_s32( vcvtq_s32_f32( bf ) ); \ + uint8x8_t out8 = vqmovun_s16( vcombine_s16(ai, bi) ); \ + out = vreinterpretq_u32_u8( vcombine_u8(out8, out8) ); \ + } + + #define stbir__simdf_pack_to_8words(out,aa,bb) \ + { \ + float32x4_t af = vmaxq_f32( vminq_f32(aa,STBIR__CONSTF(STBIR_max_uint16_as_float) ), vdupq_n_f32(0) ); \ + float32x4_t bf = vmaxq_f32( vminq_f32(bb,STBIR__CONSTF(STBIR_max_uint16_as_float) ), vdupq_n_f32(0) ); \ + int32x4_t ai = vcvtq_s32_f32( af ); \ + int32x4_t bi = vcvtq_s32_f32( bf ); \ + out = vreinterpretq_u32_u16( vcombine_u16(vqmovun_s32(ai), vqmovun_s32(bi)) ); \ + } + + #define stbir__interleave_pack_and_store_16_u8( ptr, r0, r1, r2, r3 ) \ + { \ + int16x4x2_t tmp0 = vzip_s16( vqmovn_s32(vreinterpretq_s32_u32(r0)), vqmovn_s32(vreinterpretq_s32_u32(r2)) ); \ + int16x4x2_t tmp1 = vzip_s16( vqmovn_s32(vreinterpretq_s32_u32(r1)), vqmovn_s32(vreinterpretq_s32_u32(r3)) ); \ + uint8x8x2_t out = \ + { { \ + vqmovun_s16( vcombine_s16(tmp0.val[0], tmp0.val[1]) ), \ + vqmovun_s16( vcombine_s16(tmp1.val[0], tmp1.val[1]) ), \ + } }; \ + vst2_u8(ptr, out); \ + } + + #define stbir__simdf_load4_transposed( o0, o1, o2, o3, ptr ) \ + { \ + float32x4x4_t tmp = vld4q_f32(ptr); \ + o0 = tmp.val[0]; \ + o1 = tmp.val[1]; \ + o2 = tmp.val[2]; \ + o3 = tmp.val[3]; \ + } + + #define stbir__simdi_32shr( out, reg, imm ) out = vshrq_n_u32( reg, imm ) + + #if defined( _MSC_VER ) && !defined(__clang__) + #define STBIR__SIMDF_CONST(var, x) __declspec(align(8)) float var[] = { x, x, x, x } + #define STBIR__SIMDI_CONST(var, x) __declspec(align(8)) uint32_t var[] = { x, x, x, x } + #define STBIR__CONSTF(var) (*(const float32x4_t*)var) + #define STBIR__CONSTI(var) (*(const uint32x4_t*)var) + #else + #define STBIR__SIMDF_CONST(var, x) stbir__simdf var = { x, x, x, x } + #define STBIR__SIMDI_CONST(var, x) stbir__simdi var = { x, x, x, x } + #define STBIR__CONSTF(var) (var) + #define STBIR__CONSTI(var) (var) + #endif + + #ifdef STBIR_FLOORF + #undef STBIR_FLOORF + #endif + #define STBIR_FLOORF stbir_simd_floorf + static stbir__inline float stbir_simd_floorf(float x) + { + #if defined( _M_ARM64 ) || defined( __aarch64__ ) || defined( __arm64__ ) + return vget_lane_f32( vrndm_f32( vdup_n_f32(x) ), 0); + #else + float32x2_t f = vdup_n_f32(x); + float32x2_t t = vcvt_f32_s32(vcvt_s32_f32(f)); + uint32x2_t a = vclt_f32(f, t); + uint32x2_t b = vreinterpret_u32_f32(vdup_n_f32(-1.0f)); + float32x2_t r = vadd_f32(t, vreinterpret_f32_u32(vand_u32(a, b))); + return vget_lane_f32(r, 0); + #endif + } + + #ifdef STBIR_CEILF + #undef STBIR_CEILF + #endif + #define STBIR_CEILF stbir_simd_ceilf + static stbir__inline float stbir_simd_ceilf(float x) + { + #if defined( _M_ARM64 ) || defined( __aarch64__ ) || defined( __arm64__ ) + return vget_lane_f32( vrndp_f32( vdup_n_f32(x) ), 0); + #else + float32x2_t f = vdup_n_f32(x); + float32x2_t t = vcvt_f32_s32(vcvt_s32_f32(f)); + uint32x2_t a = vclt_f32(t, f); + uint32x2_t b = vreinterpret_u32_f32(vdup_n_f32(1.0f)); + float32x2_t r = vadd_f32(t, vreinterpret_f32_u32(vand_u32(a, b))); + return vget_lane_f32(r, 0); + #endif + } + + #define STBIR_SIMD + +#elif defined(STBIR_WASM) + + #include <wasm_simd128.h> + + #define stbir__simdf v128_t + #define stbir__simdi v128_t + + #define stbir_simdi_castf( reg ) (reg) + #define stbir_simdf_casti( reg ) (reg) + + #define stbir__simdf_load( reg, ptr ) (reg) = wasm_v128_load( (void const*)(ptr) ) + #define stbir__simdi_load( reg, ptr ) (reg) = wasm_v128_load( (void const*)(ptr) ) + #define stbir__simdf_load1( out, ptr ) (out) = wasm_v128_load32_splat( (void const*)(ptr) ) // top values can be random (not denormal or nan for perf) + #define stbir__simdi_load1( out, ptr ) (out) = wasm_v128_load32_splat( (void const*)(ptr) ) + #define stbir__simdf_load1z( out, ptr ) (out) = wasm_v128_load32_zero( (void const*)(ptr) ) // top values must be zero + #define stbir__simdf_frep4( fvar ) wasm_f32x4_splat( fvar ) + #define stbir__simdf_load1frep4( out, fvar ) (out) = wasm_f32x4_splat( fvar ) + #define stbir__simdf_load2( out, ptr ) (out) = wasm_v128_load64_splat( (void const*)(ptr) ) // top values can be random (not denormal or nan for perf) + #define stbir__simdf_load2z( out, ptr ) (out) = wasm_v128_load64_zero( (void const*)(ptr) ) // top values must be zero + #define stbir__simdf_load2hmerge( out, reg, ptr ) (out) = wasm_v128_load64_lane( (void const*)(ptr), reg, 1 ) + + #define stbir__simdf_zeroP() wasm_f32x4_const_splat(0) + #define stbir__simdf_zero( reg ) (reg) = wasm_f32x4_const_splat(0) + + #define stbir__simdf_store( ptr, reg ) wasm_v128_store( (void*)(ptr), reg ) + #define stbir__simdf_store1( ptr, reg ) wasm_v128_store32_lane( (void*)(ptr), reg, 0 ) + #define stbir__simdf_store2( ptr, reg ) wasm_v128_store64_lane( (void*)(ptr), reg, 0 ) + #define stbir__simdf_store2h( ptr, reg ) wasm_v128_store64_lane( (void*)(ptr), reg, 1 ) + + #define stbir__simdi_store( ptr, reg ) wasm_v128_store( (void*)(ptr), reg ) + #define stbir__simdi_store1( ptr, reg ) wasm_v128_store32_lane( (void*)(ptr), reg, 0 ) + #define stbir__simdi_store2( ptr, reg ) wasm_v128_store64_lane( (void*)(ptr), reg, 0 ) + + #define stbir__prefetch( ptr ) + + #define stbir__simdi_expand_u8_to_u32(out0,out1,out2,out3,ireg) \ + { \ + v128_t l = wasm_u16x8_extend_low_u8x16 ( ireg ); \ + v128_t h = wasm_u16x8_extend_high_u8x16( ireg ); \ + out0 = wasm_u32x4_extend_low_u16x8 ( l ); \ + out1 = wasm_u32x4_extend_high_u16x8( l ); \ + out2 = wasm_u32x4_extend_low_u16x8 ( h ); \ + out3 = wasm_u32x4_extend_high_u16x8( h ); \ + } + + #define stbir__simdi_expand_u8_to_1u32(out,ireg) \ + { \ + v128_t tmp = wasm_u16x8_extend_low_u8x16(ireg); \ + out = wasm_u32x4_extend_low_u16x8(tmp); \ + } + + #define stbir__simdi_expand_u16_to_u32(out0,out1,ireg) \ + { \ + out0 = wasm_u32x4_extend_low_u16x8 ( ireg ); \ + out1 = wasm_u32x4_extend_high_u16x8( ireg ); \ + } + + #define stbir__simdf_convert_float_to_i32( i, f ) (i) = wasm_i32x4_trunc_sat_f32x4(f) + #define stbir__simdf_convert_float_to_int( f ) wasm_i32x4_extract_lane(wasm_i32x4_trunc_sat_f32x4(f), 0) + #define stbir__simdi_to_int( i ) wasm_i32x4_extract_lane(i, 0) + #define stbir__simdf_convert_float_to_uint8( f ) ((unsigned char)wasm_i32x4_extract_lane(wasm_i32x4_trunc_sat_f32x4(wasm_f32x4_max(wasm_f32x4_min(f,STBIR_max_uint8_as_float),wasm_f32x4_const_splat(0))), 0)) + #define stbir__simdf_convert_float_to_short( f ) ((unsigned short)wasm_i32x4_extract_lane(wasm_i32x4_trunc_sat_f32x4(wasm_f32x4_max(wasm_f32x4_min(f,STBIR_max_uint16_as_float),wasm_f32x4_const_splat(0))), 0)) + #define stbir__simdi_convert_i32_to_float(out, ireg) (out) = wasm_f32x4_convert_i32x4(ireg) + #define stbir__simdf_add( out, reg0, reg1 ) (out) = wasm_f32x4_add( reg0, reg1 ) + #define stbir__simdf_mult( out, reg0, reg1 ) (out) = wasm_f32x4_mul( reg0, reg1 ) + #define stbir__simdf_mult_mem( out, reg, ptr ) (out) = wasm_f32x4_mul( reg, wasm_v128_load( (void const*)(ptr) ) ) + #define stbir__simdf_mult1_mem( out, reg, ptr ) (out) = wasm_f32x4_mul( reg, wasm_v128_load32_splat( (void const*)(ptr) ) ) + #define stbir__simdf_add_mem( out, reg, ptr ) (out) = wasm_f32x4_add( reg, wasm_v128_load( (void const*)(ptr) ) ) + #define stbir__simdf_add1_mem( out, reg, ptr ) (out) = wasm_f32x4_add( reg, wasm_v128_load32_splat( (void const*)(ptr) ) ) + + #define stbir__simdf_madd( out, add, mul1, mul2 ) (out) = wasm_f32x4_add( add, wasm_f32x4_mul( mul1, mul2 ) ) + #define stbir__simdf_madd1( out, add, mul1, mul2 ) (out) = wasm_f32x4_add( add, wasm_f32x4_mul( mul1, mul2 ) ) + #define stbir__simdf_madd_mem( out, add, mul, ptr ) (out) = wasm_f32x4_add( add, wasm_f32x4_mul( mul, wasm_v128_load( (void const*)(ptr) ) ) ) + #define stbir__simdf_madd1_mem( out, add, mul, ptr ) (out) = wasm_f32x4_add( add, wasm_f32x4_mul( mul, wasm_v128_load32_splat( (void const*)(ptr) ) ) ) + + #define stbir__simdf_add1( out, reg0, reg1 ) (out) = wasm_f32x4_add( reg0, reg1 ) + #define stbir__simdf_mult1( out, reg0, reg1 ) (out) = wasm_f32x4_mul( reg0, reg1 ) + + #define stbir__simdf_and( out, reg0, reg1 ) (out) = wasm_v128_and( reg0, reg1 ) + #define stbir__simdf_or( out, reg0, reg1 ) (out) = wasm_v128_or( reg0, reg1 ) + + #define stbir__simdf_min( out, reg0, reg1 ) (out) = wasm_f32x4_min( reg0, reg1 ) + #define stbir__simdf_max( out, reg0, reg1 ) (out) = wasm_f32x4_max( reg0, reg1 ) + #define stbir__simdf_min1( out, reg0, reg1 ) (out) = wasm_f32x4_min( reg0, reg1 ) + #define stbir__simdf_max1( out, reg0, reg1 ) (out) = wasm_f32x4_max( reg0, reg1 ) + + #define stbir__simdf_0123ABCDto3ABx( out, reg0, reg1 ) (out) = wasm_i32x4_shuffle( reg0, reg1, 3, 4, 5, -1 ) + #define stbir__simdf_0123ABCDto23Ax( out, reg0, reg1 ) (out) = wasm_i32x4_shuffle( reg0, reg1, 2, 3, 4, -1 ) + + #define stbir__simdf_aaa1(out,alp,ones) (out) = wasm_i32x4_shuffle(alp, ones, 3, 3, 3, 4) + #define stbir__simdf_1aaa(out,alp,ones) (out) = wasm_i32x4_shuffle(alp, ones, 4, 0, 0, 0) + #define stbir__simdf_a1a1(out,alp,ones) (out) = wasm_i32x4_shuffle(alp, ones, 1, 4, 3, 4) + #define stbir__simdf_1a1a(out,alp,ones) (out) = wasm_i32x4_shuffle(alp, ones, 4, 0, 4, 2) + + #define stbir__simdf_swiz( reg, one, two, three, four ) wasm_i32x4_shuffle(reg, reg, one, two, three, four) + + #define stbir__simdi_and( out, reg0, reg1 ) (out) = wasm_v128_and( reg0, reg1 ) + #define stbir__simdi_or( out, reg0, reg1 ) (out) = wasm_v128_or( reg0, reg1 ) + #define stbir__simdi_16madd( out, reg0, reg1 ) (out) = wasm_i32x4_dot_i16x8( reg0, reg1 ) + + #define stbir__simdf_pack_to_8bytes(out,aa,bb) \ + { \ + v128_t af = wasm_f32x4_max( wasm_f32x4_min(aa, STBIR_max_uint8_as_float), wasm_f32x4_const_splat(0) ); \ + v128_t bf = wasm_f32x4_max( wasm_f32x4_min(bb, STBIR_max_uint8_as_float), wasm_f32x4_const_splat(0) ); \ + v128_t ai = wasm_i32x4_trunc_sat_f32x4( af ); \ + v128_t bi = wasm_i32x4_trunc_sat_f32x4( bf ); \ + v128_t out16 = wasm_i16x8_narrow_i32x4( ai, bi ); \ + out = wasm_u8x16_narrow_i16x8( out16, out16 ); \ + } + + #define stbir__simdf_pack_to_8words(out,aa,bb) \ + { \ + v128_t af = wasm_f32x4_max( wasm_f32x4_min(aa, STBIR_max_uint16_as_float), wasm_f32x4_const_splat(0)); \ + v128_t bf = wasm_f32x4_max( wasm_f32x4_min(bb, STBIR_max_uint16_as_float), wasm_f32x4_const_splat(0)); \ + v128_t ai = wasm_i32x4_trunc_sat_f32x4( af ); \ + v128_t bi = wasm_i32x4_trunc_sat_f32x4( bf ); \ + out = wasm_u16x8_narrow_i32x4( ai, bi ); \ + } + + #define stbir__interleave_pack_and_store_16_u8( ptr, r0, r1, r2, r3 ) \ + { \ + v128_t tmp0 = wasm_i16x8_narrow_i32x4(r0, r1); \ + v128_t tmp1 = wasm_i16x8_narrow_i32x4(r2, r3); \ + v128_t tmp = wasm_u8x16_narrow_i16x8(tmp0, tmp1); \ + tmp = wasm_i8x16_shuffle(tmp, tmp, 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15); \ + wasm_v128_store( (void*)(ptr), tmp); \ + } + + #define stbir__simdf_load4_transposed( o0, o1, o2, o3, ptr ) \ + { \ + v128_t t0 = wasm_v128_load( ptr ); \ + v128_t t1 = wasm_v128_load( ptr+4 ); \ + v128_t t2 = wasm_v128_load( ptr+8 ); \ + v128_t t3 = wasm_v128_load( ptr+12 ); \ + v128_t s0 = wasm_i32x4_shuffle(t0, t1, 0, 4, 2, 6); \ + v128_t s1 = wasm_i32x4_shuffle(t0, t1, 1, 5, 3, 7); \ + v128_t s2 = wasm_i32x4_shuffle(t2, t3, 0, 4, 2, 6); \ + v128_t s3 = wasm_i32x4_shuffle(t2, t3, 1, 5, 3, 7); \ + o0 = wasm_i32x4_shuffle(s0, s2, 0, 1, 4, 5); \ + o1 = wasm_i32x4_shuffle(s1, s3, 0, 1, 4, 5); \ + o2 = wasm_i32x4_shuffle(s0, s2, 2, 3, 6, 7); \ + o3 = wasm_i32x4_shuffle(s1, s3, 2, 3, 6, 7); \ + } + + #define stbir__simdi_32shr( out, reg, imm ) out = wasm_u32x4_shr( reg, imm ) + + typedef float stbir__f32x4 __attribute__((__vector_size__(16), __aligned__(16))); + #define STBIR__SIMDF_CONST(var, x) stbir__simdf var = (v128_t)(stbir__f32x4){ x, x, x, x } + #define STBIR__SIMDI_CONST(var, x) stbir__simdi var = { x, x, x, x } + #define STBIR__CONSTF(var) (var) + #define STBIR__CONSTI(var) (var) + + #ifdef STBIR_FLOORF + #undef STBIR_FLOORF + #endif + #define STBIR_FLOORF stbir_simd_floorf + static stbir__inline float stbir_simd_floorf(float x) + { + return wasm_f32x4_extract_lane( wasm_f32x4_floor( wasm_f32x4_splat(x) ), 0); + } + + #ifdef STBIR_CEILF + #undef STBIR_CEILF + #endif + #define STBIR_CEILF stbir_simd_ceilf + static stbir__inline float stbir_simd_ceilf(float x) + { + return wasm_f32x4_extract_lane( wasm_f32x4_ceil( wasm_f32x4_splat(x) ), 0); + } + + #define STBIR_SIMD + +#endif // SSE2/NEON/WASM + +#endif // NO SIMD + +#ifdef STBIR_SIMD8 + #define stbir__simdfX stbir__simdf8 + #define stbir__simdiX stbir__simdi8 + #define stbir__simdfX_load stbir__simdf8_load + #define stbir__simdiX_load stbir__simdi8_load + #define stbir__simdfX_mult stbir__simdf8_mult + #define stbir__simdfX_add_mem stbir__simdf8_add_mem + #define stbir__simdfX_madd_mem stbir__simdf8_madd_mem + #define stbir__simdfX_store stbir__simdf8_store + #define stbir__simdiX_store stbir__simdi8_store + #define stbir__simdf_frepX stbir__simdf8_frep8 + #define stbir__simdfX_madd stbir__simdf8_madd + #define stbir__simdfX_min stbir__simdf8_min + #define stbir__simdfX_max stbir__simdf8_max + #define stbir__simdfX_aaa1 stbir__simdf8_aaa1 + #define stbir__simdfX_1aaa stbir__simdf8_1aaa + #define stbir__simdfX_a1a1 stbir__simdf8_a1a1 + #define stbir__simdfX_1a1a stbir__simdf8_1a1a + #define stbir__simdfX_convert_float_to_i32 stbir__simdf8_convert_float_to_i32 + #define stbir__simdfX_pack_to_words stbir__simdf8_pack_to_16words + #define stbir__simdfX_zero stbir__simdf8_zero + #define STBIR_onesX STBIR_ones8 + #define STBIR_max_uint8_as_floatX STBIR_max_uint8_as_float8 + #define STBIR_max_uint16_as_floatX STBIR_max_uint16_as_float8 + #define STBIR_simd_point5X STBIR_simd_point58 + #define stbir__simdfX_float_count 8 + #define stbir__simdfX_0123to1230 stbir__simdf8_0123to12301230 + #define stbir__simdfX_0123to2103 stbir__simdf8_0123to21032103 + static const stbir__simdf8 STBIR_max_uint16_as_float_inverted8 = { stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted,stbir__max_uint16_as_float_inverted }; + static const stbir__simdf8 STBIR_max_uint8_as_float_inverted8 = { stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted,stbir__max_uint8_as_float_inverted }; + static const stbir__simdf8 STBIR_ones8 = { 1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0 }; + static const stbir__simdf8 STBIR_simd_point58 = { 0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5 }; + static const stbir__simdf8 STBIR_max_uint8_as_float8 = { stbir__max_uint8_as_float,stbir__max_uint8_as_float,stbir__max_uint8_as_float,stbir__max_uint8_as_float, stbir__max_uint8_as_float,stbir__max_uint8_as_float,stbir__max_uint8_as_float,stbir__max_uint8_as_float }; + static const stbir__simdf8 STBIR_max_uint16_as_float8 = { stbir__max_uint16_as_float,stbir__max_uint16_as_float,stbir__max_uint16_as_float,stbir__max_uint16_as_float, stbir__max_uint16_as_float,stbir__max_uint16_as_float,stbir__max_uint16_as_float,stbir__max_uint16_as_float }; +#else + #define stbir__simdfX stbir__simdf + #define stbir__simdiX stbir__simdi + #define stbir__simdfX_load stbir__simdf_load + #define stbir__simdiX_load stbir__simdi_load + #define stbir__simdfX_mult stbir__simdf_mult + #define stbir__simdfX_add_mem stbir__simdf_add_mem + #define stbir__simdfX_madd_mem stbir__simdf_madd_mem + #define stbir__simdfX_store stbir__simdf_store + #define stbir__simdiX_store stbir__simdi_store + #define stbir__simdf_frepX stbir__simdf_frep4 + #define stbir__simdfX_madd stbir__simdf_madd + #define stbir__simdfX_min stbir__simdf_min + #define stbir__simdfX_max stbir__simdf_max + #define stbir__simdfX_aaa1 stbir__simdf_aaa1 + #define stbir__simdfX_1aaa stbir__simdf_1aaa + #define stbir__simdfX_a1a1 stbir__simdf_a1a1 + #define stbir__simdfX_1a1a stbir__simdf_1a1a + #define stbir__simdfX_convert_float_to_i32 stbir__simdf_convert_float_to_i32 + #define stbir__simdfX_pack_to_words stbir__simdf_pack_to_8words + #define stbir__simdfX_zero stbir__simdf_zero + #define STBIR_onesX STBIR__CONSTF(STBIR_ones) + #define STBIR_simd_point5X STBIR__CONSTF(STBIR_simd_point5) + #define STBIR_max_uint8_as_floatX STBIR__CONSTF(STBIR_max_uint8_as_float) + #define STBIR_max_uint16_as_floatX STBIR__CONSTF(STBIR_max_uint16_as_float) + #define stbir__simdfX_float_count 4 + #define stbir__if_simdf8_cast_to_simdf4( val ) ( val ) + #define stbir__simdfX_0123to1230 stbir__simdf_0123to1230 + #define stbir__simdfX_0123to2103 stbir__simdf_0123to2103 +#endif + + +#if defined(STBIR_NEON) && !defined(_M_ARM) && !defined(__arm__) + + #if defined( _MSC_VER ) && !defined(__clang__) + typedef __int16 stbir__FP16; + #else + typedef float16_t stbir__FP16; + #endif + +#else // no NEON, or 32-bit ARM for MSVC + + typedef union stbir__FP16 + { + unsigned short u; + } stbir__FP16; + +#endif + +#if (!defined(STBIR_NEON) && !defined(STBIR_FP16C)) || (defined(STBIR_NEON) && defined(_M_ARM)) || (defined(STBIR_NEON) && defined(__arm__)) + + // Fabian's half float routines, see: https://gist.github.com/rygorous/2156668 + + static stbir__inline float stbir__half_to_float( stbir__FP16 h ) + { + static const stbir__FP32 magic = { (254 - 15) << 23 }; + static const stbir__FP32 was_infnan = { (127 + 16) << 23 }; + stbir__FP32 o; + + o.u = (h.u & 0x7fff) << 13; // exponent/mantissa bits + o.f *= magic.f; // exponent adjust + if (o.f >= was_infnan.f) // make sure Inf/NaN survive + o.u |= 255 << 23; + o.u |= (h.u & 0x8000) << 16; // sign bit + return o.f; + } + + static stbir__inline stbir__FP16 stbir__float_to_half(float val) + { + stbir__FP32 f32infty = { 255 << 23 }; + stbir__FP32 f16max = { (127 + 16) << 23 }; + stbir__FP32 denorm_magic = { ((127 - 15) + (23 - 10) + 1) << 23 }; + unsigned int sign_mask = 0x80000000u; + stbir__FP16 o = { 0 }; + stbir__FP32 f; + unsigned int sign; + + f.f = val; + sign = f.u & sign_mask; + f.u ^= sign; + + if (f.u >= f16max.u) // result is Inf or NaN (all exponent bits set) + o.u = (f.u > f32infty.u) ? 0x7e00 : 0x7c00; // NaN->qNaN and Inf->Inf + else // (De)normalized number or zero + { + if (f.u < (113 << 23)) // resulting FP16 is subnormal or zero + { + // use a magic value to align our 10 mantissa bits at the bottom of + // the float. as long as FP addition is round-to-nearest-even this + // just works. + f.f += denorm_magic.f; + // and one integer subtract of the bias later, we have our final float! + o.u = (unsigned short) ( f.u - denorm_magic.u ); + } + else + { + unsigned int mant_odd = (f.u >> 13) & 1; // resulting mantissa is odd + // update exponent, rounding bias part 1 + f.u = f.u + ((15u - 127) << 23) + 0xfff; + // rounding bias part 2 + f.u += mant_odd; + // take the bits! + o.u = (unsigned short) ( f.u >> 13 ); + } + } + + o.u |= sign >> 16; + return o; + } + +#endif + + +#if defined(STBIR_FP16C) + + #include <immintrin.h> + + static stbir__inline void stbir__half_to_float_SIMD(float * output, stbir__FP16 const * input) + { + _mm256_storeu_ps( (float*)output, _mm256_cvtph_ps( _mm_loadu_si128( (__m128i const* )input ) ) ); + } + + static stbir__inline void stbir__float_to_half_SIMD(stbir__FP16 * output, float const * input) + { + _mm_storeu_si128( (__m128i*)output, _mm256_cvtps_ph( _mm256_loadu_ps( input ), 0 ) ); + } + + static stbir__inline float stbir__half_to_float( stbir__FP16 h ) + { + return _mm_cvtss_f32( _mm_cvtph_ps( _mm_cvtsi32_si128( (int)h.u ) ) ); + } + + static stbir__inline stbir__FP16 stbir__float_to_half( float f ) + { + stbir__FP16 h; + h.u = (unsigned short) _mm_cvtsi128_si32( _mm_cvtps_ph( _mm_set_ss( f ), 0 ) ); + return h; + } + +#elif defined(STBIR_SSE2) + + // Fabian's half float routines, see: https://gist.github.com/rygorous/2156668 + stbir__inline static void stbir__half_to_float_SIMD(float * output, void const * input) + { + static const STBIR__SIMDI_CONST(mask_nosign, 0x7fff); + static const STBIR__SIMDI_CONST(smallest_normal, 0x0400); + static const STBIR__SIMDI_CONST(infinity, 0x7c00); + static const STBIR__SIMDI_CONST(expadjust_normal, (127 - 15) << 23); + static const STBIR__SIMDI_CONST(magic_denorm, 113 << 23); + + __m128i i = _mm_loadu_si128 ( (__m128i const*)(input) ); + __m128i h = _mm_unpacklo_epi16 ( i, _mm_setzero_si128() ); + __m128i mnosign = STBIR__CONSTI(mask_nosign); + __m128i eadjust = STBIR__CONSTI(expadjust_normal); + __m128i smallest = STBIR__CONSTI(smallest_normal); + __m128i infty = STBIR__CONSTI(infinity); + __m128i expmant = _mm_and_si128(mnosign, h); + __m128i justsign = _mm_xor_si128(h, expmant); + __m128i b_notinfnan = _mm_cmpgt_epi32(infty, expmant); + __m128i b_isdenorm = _mm_cmpgt_epi32(smallest, expmant); + __m128i shifted = _mm_slli_epi32(expmant, 13); + __m128i adj_infnan = _mm_andnot_si128(b_notinfnan, eadjust); + __m128i adjusted = _mm_add_epi32(eadjust, shifted); + __m128i den1 = _mm_add_epi32(shifted, STBIR__CONSTI(magic_denorm)); + __m128i adjusted2 = _mm_add_epi32(adjusted, adj_infnan); + __m128 den2 = _mm_sub_ps(_mm_castsi128_ps(den1), *(const __m128 *)&magic_denorm); + __m128 adjusted3 = _mm_and_ps(den2, _mm_castsi128_ps(b_isdenorm)); + __m128 adjusted4 = _mm_andnot_ps(_mm_castsi128_ps(b_isdenorm), _mm_castsi128_ps(adjusted2)); + __m128 adjusted5 = _mm_or_ps(adjusted3, adjusted4); + __m128i sign = _mm_slli_epi32(justsign, 16); + __m128 final = _mm_or_ps(adjusted5, _mm_castsi128_ps(sign)); + stbir__simdf_store( output + 0, final ); + + h = _mm_unpackhi_epi16 ( i, _mm_setzero_si128() ); + expmant = _mm_and_si128(mnosign, h); + justsign = _mm_xor_si128(h, expmant); + b_notinfnan = _mm_cmpgt_epi32(infty, expmant); + b_isdenorm = _mm_cmpgt_epi32(smallest, expmant); + shifted = _mm_slli_epi32(expmant, 13); + adj_infnan = _mm_andnot_si128(b_notinfnan, eadjust); + adjusted = _mm_add_epi32(eadjust, shifted); + den1 = _mm_add_epi32(shifted, STBIR__CONSTI(magic_denorm)); + adjusted2 = _mm_add_epi32(adjusted, adj_infnan); + den2 = _mm_sub_ps(_mm_castsi128_ps(den1), *(const __m128 *)&magic_denorm); + adjusted3 = _mm_and_ps(den2, _mm_castsi128_ps(b_isdenorm)); + adjusted4 = _mm_andnot_ps(_mm_castsi128_ps(b_isdenorm), _mm_castsi128_ps(adjusted2)); + adjusted5 = _mm_or_ps(adjusted3, adjusted4); + sign = _mm_slli_epi32(justsign, 16); + final = _mm_or_ps(adjusted5, _mm_castsi128_ps(sign)); + stbir__simdf_store( output + 4, final ); + + // ~38 SSE2 ops for 8 values + } + + // Fabian's round-to-nearest-even float to half + // ~48 SSE2 ops for 8 output + stbir__inline static void stbir__float_to_half_SIMD(void * output, float const * input) + { + static const STBIR__SIMDI_CONST(mask_sign, 0x80000000u); + static const STBIR__SIMDI_CONST(c_f16max, (127 + 16) << 23); // all FP32 values >=this round to +inf + static const STBIR__SIMDI_CONST(c_nanbit, 0x200); + static const STBIR__SIMDI_CONST(c_infty_as_fp16, 0x7c00); + static const STBIR__SIMDI_CONST(c_min_normal, (127 - 14) << 23); // smallest FP32 that yields a normalized FP16 + static const STBIR__SIMDI_CONST(c_subnorm_magic, ((127 - 15) + (23 - 10) + 1) << 23); + static const STBIR__SIMDI_CONST(c_normal_bias, 0xfff - ((127 - 15) << 23)); // adjust exponent and add mantissa rounding + + __m128 f = _mm_loadu_ps(input); + __m128 msign = _mm_castsi128_ps(STBIR__CONSTI(mask_sign)); + __m128 justsign = _mm_and_ps(msign, f); + __m128 absf = _mm_xor_ps(f, justsign); + __m128i absf_int = _mm_castps_si128(absf); // the cast is "free" (extra bypass latency, but no thruput hit) + __m128i f16max = STBIR__CONSTI(c_f16max); + __m128 b_isnan = _mm_cmpunord_ps(absf, absf); // is this a NaN? + __m128i b_isregular = _mm_cmpgt_epi32(f16max, absf_int); // (sub)normalized or special? + __m128i nanbit = _mm_and_si128(_mm_castps_si128(b_isnan), STBIR__CONSTI(c_nanbit)); + __m128i inf_or_nan = _mm_or_si128(nanbit, STBIR__CONSTI(c_infty_as_fp16)); // output for specials + + __m128i min_normal = STBIR__CONSTI(c_min_normal); + __m128i b_issub = _mm_cmpgt_epi32(min_normal, absf_int); + + // "result is subnormal" path + __m128 subnorm1 = _mm_add_ps(absf, _mm_castsi128_ps(STBIR__CONSTI(c_subnorm_magic))); // magic value to round output mantissa + __m128i subnorm2 = _mm_sub_epi32(_mm_castps_si128(subnorm1), STBIR__CONSTI(c_subnorm_magic)); // subtract out bias + + // "result is normal" path + __m128i mantoddbit = _mm_slli_epi32(absf_int, 31 - 13); // shift bit 13 (mantissa LSB) to sign + __m128i mantodd = _mm_srai_epi32(mantoddbit, 31); // -1 if FP16 mantissa odd, else 0 + + __m128i round1 = _mm_add_epi32(absf_int, STBIR__CONSTI(c_normal_bias)); + __m128i round2 = _mm_sub_epi32(round1, mantodd); // if mantissa LSB odd, bias towards rounding up (RTNE) + __m128i normal = _mm_srli_epi32(round2, 13); // rounded result + + // combine the two non-specials + __m128i nonspecial = _mm_or_si128(_mm_and_si128(subnorm2, b_issub), _mm_andnot_si128(b_issub, normal)); + + // merge in specials as well + __m128i joined = _mm_or_si128(_mm_and_si128(nonspecial, b_isregular), _mm_andnot_si128(b_isregular, inf_or_nan)); + + __m128i sign_shift = _mm_srai_epi32(_mm_castps_si128(justsign), 16); + __m128i final2, final= _mm_or_si128(joined, sign_shift); + + f = _mm_loadu_ps(input+4); + justsign = _mm_and_ps(msign, f); + absf = _mm_xor_ps(f, justsign); + absf_int = _mm_castps_si128(absf); // the cast is "free" (extra bypass latency, but no thruput hit) + b_isnan = _mm_cmpunord_ps(absf, absf); // is this a NaN? + b_isregular = _mm_cmpgt_epi32(f16max, absf_int); // (sub)normalized or special? + nanbit = _mm_and_si128(_mm_castps_si128(b_isnan), c_nanbit); + inf_or_nan = _mm_or_si128(nanbit, STBIR__CONSTI(c_infty_as_fp16)); // output for specials + + b_issub = _mm_cmpgt_epi32(min_normal, absf_int); + + // "result is subnormal" path + subnorm1 = _mm_add_ps(absf, _mm_castsi128_ps(STBIR__CONSTI(c_subnorm_magic))); // magic value to round output mantissa + subnorm2 = _mm_sub_epi32(_mm_castps_si128(subnorm1), STBIR__CONSTI(c_subnorm_magic)); // subtract out bias + + // "result is normal" path + mantoddbit = _mm_slli_epi32(absf_int, 31 - 13); // shift bit 13 (mantissa LSB) to sign + mantodd = _mm_srai_epi32(mantoddbit, 31); // -1 if FP16 mantissa odd, else 0 + + round1 = _mm_add_epi32(absf_int, STBIR__CONSTI(c_normal_bias)); + round2 = _mm_sub_epi32(round1, mantodd); // if mantissa LSB odd, bias towards rounding up (RTNE) + normal = _mm_srli_epi32(round2, 13); // rounded result + + // combine the two non-specials + nonspecial = _mm_or_si128(_mm_and_si128(subnorm2, b_issub), _mm_andnot_si128(b_issub, normal)); + + // merge in specials as well + joined = _mm_or_si128(_mm_and_si128(nonspecial, b_isregular), _mm_andnot_si128(b_isregular, inf_or_nan)); + + sign_shift = _mm_srai_epi32(_mm_castps_si128(justsign), 16); + final2 = _mm_or_si128(joined, sign_shift); + final = _mm_packs_epi32(final, final2); + stbir__simdi_store( output,final ); + } + +#elif defined(STBIR_NEON) && defined(_MSC_VER) && defined(_M_ARM64) && !defined(__clang__) // 64-bit ARM on MSVC (not clang) + + static stbir__inline void stbir__half_to_float_SIMD(float * output, stbir__FP16 const * input) + { + float16x4_t in0 = vld1_f16(input + 0); + float16x4_t in1 = vld1_f16(input + 4); + vst1q_f32(output + 0, vcvt_f32_f16(in0)); + vst1q_f32(output + 4, vcvt_f32_f16(in1)); + } + + static stbir__inline void stbir__float_to_half_SIMD(stbir__FP16 * output, float const * input) + { + float16x4_t out0 = vcvt_f16_f32(vld1q_f32(input + 0)); + float16x4_t out1 = vcvt_f16_f32(vld1q_f32(input + 4)); + vst1_f16(output+0, out0); + vst1_f16(output+4, out1); + } + + static stbir__inline float stbir__half_to_float( stbir__FP16 h ) + { + return vgetq_lane_f32(vcvt_f32_f16(vld1_dup_f16(&h)), 0); + } + + static stbir__inline stbir__FP16 stbir__float_to_half( float f ) + { + return vget_lane_f16(vcvt_f16_f32(vdupq_n_f32(f)), 0).n16_u16[0]; + } + +#elif defined(STBIR_NEON) && ( defined( _M_ARM64 ) || defined( __aarch64__ ) || defined( __arm64__ ) ) // 64-bit ARM + + static stbir__inline void stbir__half_to_float_SIMD(float * output, stbir__FP16 const * input) + { + float16x8_t in = vld1q_f16(input); + vst1q_f32(output + 0, vcvt_f32_f16(vget_low_f16(in))); + vst1q_f32(output + 4, vcvt_f32_f16(vget_high_f16(in))); + } + + static stbir__inline void stbir__float_to_half_SIMD(stbir__FP16 * output, float const * input) + { + float16x4_t out0 = vcvt_f16_f32(vld1q_f32(input + 0)); + float16x4_t out1 = vcvt_f16_f32(vld1q_f32(input + 4)); + vst1q_f16(output, vcombine_f16(out0, out1)); + } + + static stbir__inline float stbir__half_to_float( stbir__FP16 h ) + { + return vgetq_lane_f32(vcvt_f32_f16(vdup_n_f16(h)), 0); + } + + static stbir__inline stbir__FP16 stbir__float_to_half( float f ) + { + return vget_lane_f16(vcvt_f16_f32(vdupq_n_f32(f)), 0); + } + +#elif defined(STBIR_WASM) || (defined(STBIR_NEON) && (defined(_MSC_VER) || defined(_M_ARM) || defined(__arm__))) // WASM or 32-bit ARM on MSVC/clang + + static stbir__inline void stbir__half_to_float_SIMD(float * output, stbir__FP16 const * input) + { + for (int i=0; i<8; i++) + { + output[i] = stbir__half_to_float(input[i]); + } + } + static stbir__inline void stbir__float_to_half_SIMD(stbir__FP16 * output, float const * input) + { + for (int i=0; i<8; i++) + { + output[i] = stbir__float_to_half(input[i]); + } + } + +#endif + + +#ifdef STBIR_SIMD + +#define stbir__simdf_0123to3333( out, reg ) (out) = stbir__simdf_swiz( reg, 3,3,3,3 ) +#define stbir__simdf_0123to2222( out, reg ) (out) = stbir__simdf_swiz( reg, 2,2,2,2 ) +#define stbir__simdf_0123to1111( out, reg ) (out) = stbir__simdf_swiz( reg, 1,1,1,1 ) +#define stbir__simdf_0123to0000( out, reg ) (out) = stbir__simdf_swiz( reg, 0,0,0,0 ) +#define stbir__simdf_0123to0003( out, reg ) (out) = stbir__simdf_swiz( reg, 0,0,0,3 ) +#define stbir__simdf_0123to0001( out, reg ) (out) = stbir__simdf_swiz( reg, 0,0,0,1 ) +#define stbir__simdf_0123to1122( out, reg ) (out) = stbir__simdf_swiz( reg, 1,1,2,2 ) +#define stbir__simdf_0123to2333( out, reg ) (out) = stbir__simdf_swiz( reg, 2,3,3,3 ) +#define stbir__simdf_0123to0023( out, reg ) (out) = stbir__simdf_swiz( reg, 0,0,2,3 ) +#define stbir__simdf_0123to1230( out, reg ) (out) = stbir__simdf_swiz( reg, 1,2,3,0 ) +#define stbir__simdf_0123to2103( out, reg ) (out) = stbir__simdf_swiz( reg, 2,1,0,3 ) +#define stbir__simdf_0123to3210( out, reg ) (out) = stbir__simdf_swiz( reg, 3,2,1,0 ) +#define stbir__simdf_0123to2301( out, reg ) (out) = stbir__simdf_swiz( reg, 2,3,0,1 ) +#define stbir__simdf_0123to3012( out, reg ) (out) = stbir__simdf_swiz( reg, 3,0,1,2 ) +#define stbir__simdf_0123to0011( out, reg ) (out) = stbir__simdf_swiz( reg, 0,0,1,1 ) +#define stbir__simdf_0123to1100( out, reg ) (out) = stbir__simdf_swiz( reg, 1,1,0,0 ) +#define stbir__simdf_0123to2233( out, reg ) (out) = stbir__simdf_swiz( reg, 2,2,3,3 ) +#define stbir__simdf_0123to1133( out, reg ) (out) = stbir__simdf_swiz( reg, 1,1,3,3 ) +#define stbir__simdf_0123to0022( out, reg ) (out) = stbir__simdf_swiz( reg, 0,0,2,2 ) +#define stbir__simdf_0123to1032( out, reg ) (out) = stbir__simdf_swiz( reg, 1,0,3,2 ) + +typedef union stbir__simdi_u32 +{ + stbir_uint32 m128i_u32[4]; + int m128i_i32[4]; + stbir__simdi m128i_i128; +} stbir__simdi_u32; + +static const int STBIR_mask[9] = { 0,0,0,-1,-1,-1,0,0,0 }; + +static const STBIR__SIMDF_CONST(STBIR_max_uint8_as_float, stbir__max_uint8_as_float); +static const STBIR__SIMDF_CONST(STBIR_max_uint16_as_float, stbir__max_uint16_as_float); +static const STBIR__SIMDF_CONST(STBIR_max_uint8_as_float_inverted, stbir__max_uint8_as_float_inverted); +static const STBIR__SIMDF_CONST(STBIR_max_uint16_as_float_inverted, stbir__max_uint16_as_float_inverted); + +static const STBIR__SIMDF_CONST(STBIR_simd_point5, 0.5f); +static const STBIR__SIMDF_CONST(STBIR_ones, 1.0f); +static const STBIR__SIMDI_CONST(STBIR_almost_zero, (127 - 13) << 23); +static const STBIR__SIMDI_CONST(STBIR_almost_one, 0x3f7fffff); +static const STBIR__SIMDI_CONST(STBIR_mastissa_mask, 0xff); +static const STBIR__SIMDI_CONST(STBIR_topscale, 0x02000000); + +// Basically, in simd mode, we unroll the proper amount, and we don't want +// the non-simd remnant loops to be unroll because they only run a few times +// Adding this switch saves about 5K on clang which is Captain Unroll the 3rd. +#define STBIR_SIMD_STREAMOUT_PTR( star ) STBIR_STREAMOUT_PTR( star ) +#define STBIR_SIMD_NO_UNROLL(ptr) STBIR_NO_UNROLL(ptr) +#define STBIR_SIMD_NO_UNROLL_LOOP_START STBIR_NO_UNROLL_LOOP_START +#define STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR STBIR_NO_UNROLL_LOOP_START_INF_FOR + +#ifdef STBIR_MEMCPY +#undef STBIR_MEMCPY +#endif +#define STBIR_MEMCPY stbir_simd_memcpy + +// override normal use of memcpy with much simpler copy (faster and smaller with our sized copies) +static void stbir_simd_memcpy( void * dest, void const * src, size_t bytes ) +{ + char STBIR_SIMD_STREAMOUT_PTR (*) d = (char*) dest; + char STBIR_SIMD_STREAMOUT_PTR( * ) d_end = ((char*) dest) + bytes; + ptrdiff_t ofs_to_src = (char*)src - (char*)dest; + + // check overlaps + STBIR_ASSERT( ( ( d >= ( (char*)src) + bytes ) ) || ( ( d + bytes ) <= (char*)src ) ); + + if ( bytes < (16*stbir__simdfX_float_count) ) + { + if ( bytes < 16 ) + { + if ( bytes ) + { + STBIR_SIMD_NO_UNROLL_LOOP_START + do + { + STBIR_SIMD_NO_UNROLL(d); + d[ 0 ] = d[ ofs_to_src ]; + ++d; + } while ( d < d_end ); + } + } + else + { + stbir__simdf x; + // do one unaligned to get us aligned for the stream out below + stbir__simdf_load( x, ( d + ofs_to_src ) ); + stbir__simdf_store( d, x ); + d = (char*)( ( ( (size_t)d ) + 16 ) & ~15 ); + + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + STBIR_SIMD_NO_UNROLL(d); + + if ( d > ( d_end - 16 ) ) + { + if ( d == d_end ) + return; + d = d_end - 16; + } + + stbir__simdf_load( x, ( d + ofs_to_src ) ); + stbir__simdf_store( d, x ); + d += 16; + } + } + } + else + { + stbir__simdfX x0,x1,x2,x3; + + // do one unaligned to get us aligned for the stream out below + stbir__simdfX_load( x0, ( d + ofs_to_src ) + 0*stbir__simdfX_float_count ); + stbir__simdfX_load( x1, ( d + ofs_to_src ) + 4*stbir__simdfX_float_count ); + stbir__simdfX_load( x2, ( d + ofs_to_src ) + 8*stbir__simdfX_float_count ); + stbir__simdfX_load( x3, ( d + ofs_to_src ) + 12*stbir__simdfX_float_count ); + stbir__simdfX_store( d + 0*stbir__simdfX_float_count, x0 ); + stbir__simdfX_store( d + 4*stbir__simdfX_float_count, x1 ); + stbir__simdfX_store( d + 8*stbir__simdfX_float_count, x2 ); + stbir__simdfX_store( d + 12*stbir__simdfX_float_count, x3 ); + d = (char*)( ( ( (size_t)d ) + (16*stbir__simdfX_float_count) ) & ~((16*stbir__simdfX_float_count)-1) ); + + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + STBIR_SIMD_NO_UNROLL(d); + + if ( d > ( d_end - (16*stbir__simdfX_float_count) ) ) + { + if ( d == d_end ) + return; + d = d_end - (16*stbir__simdfX_float_count); + } + + stbir__simdfX_load( x0, ( d + ofs_to_src ) + 0*stbir__simdfX_float_count ); + stbir__simdfX_load( x1, ( d + ofs_to_src ) + 4*stbir__simdfX_float_count ); + stbir__simdfX_load( x2, ( d + ofs_to_src ) + 8*stbir__simdfX_float_count ); + stbir__simdfX_load( x3, ( d + ofs_to_src ) + 12*stbir__simdfX_float_count ); + stbir__simdfX_store( d + 0*stbir__simdfX_float_count, x0 ); + stbir__simdfX_store( d + 4*stbir__simdfX_float_count, x1 ); + stbir__simdfX_store( d + 8*stbir__simdfX_float_count, x2 ); + stbir__simdfX_store( d + 12*stbir__simdfX_float_count, x3 ); + d += (16*stbir__simdfX_float_count); + } + } +} + +// memcpy that is specically intentionally overlapping (src is smaller then dest, so can be +// a normal forward copy, bytes is divisible by 4 and bytes is greater than or equal to +// the diff between dest and src) +static void stbir_overlapping_memcpy( void * dest, void const * src, size_t bytes ) +{ + char STBIR_SIMD_STREAMOUT_PTR (*) sd = (char*) src; + char STBIR_SIMD_STREAMOUT_PTR( * ) s_end = ((char*) src) + bytes; + ptrdiff_t ofs_to_dest = (char*)dest - (char*)src; + + if ( ofs_to_dest >= 16 ) // is the overlap more than 16 away? + { + char STBIR_SIMD_STREAMOUT_PTR( * ) s_end16 = ((char*) src) + (bytes&~15); + STBIR_SIMD_NO_UNROLL_LOOP_START + do + { + stbir__simdf x; + STBIR_SIMD_NO_UNROLL(sd); + stbir__simdf_load( x, sd ); + stbir__simdf_store( ( sd + ofs_to_dest ), x ); + sd += 16; + } while ( sd < s_end16 ); + + if ( sd == s_end ) + return; + } + + do + { + STBIR_SIMD_NO_UNROLL(sd); + *(int*)( sd + ofs_to_dest ) = *(int*) sd; + sd += 4; + } while ( sd < s_end ); +} + +#else // no SSE2 + +// when in scalar mode, we let unrolling happen, so this macro just does the __restrict +#define STBIR_SIMD_STREAMOUT_PTR( star ) STBIR_STREAMOUT_PTR( star ) +#define STBIR_SIMD_NO_UNROLL(ptr) +#define STBIR_SIMD_NO_UNROLL_LOOP_START +#define STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + +#endif // SSE2 + + +#ifdef STBIR_PROFILE + +#ifndef STBIR_PROFILE_FUNC + +#if defined(_x86_64) || defined( __x86_64__ ) || defined( _M_X64 ) || defined(__x86_64) || defined(__SSE2__) || defined(STBIR_SSE) || defined( _M_IX86_FP ) || defined(__i386) || defined( __i386__ ) || defined( _M_IX86 ) || defined( _X86_ ) + +#ifdef _MSC_VER + + STBIRDEF stbir_uint64 __rdtsc(); + #define STBIR_PROFILE_FUNC() __rdtsc() + +#else // non msvc + + static stbir__inline stbir_uint64 STBIR_PROFILE_FUNC() + { + stbir_uint32 lo, hi; + asm volatile ("rdtsc" : "=a" (lo), "=d" (hi) ); + return ( ( (stbir_uint64) hi ) << 32 ) | ( (stbir_uint64) lo ); + } + +#endif // msvc + +#elif defined( _M_ARM64 ) || defined( __aarch64__ ) || defined( __arm64__ ) || defined(__ARM_NEON__) + +#if defined( _MSC_VER ) && !defined(__clang__) + + #define STBIR_PROFILE_FUNC() _ReadStatusReg(ARM64_CNTVCT) + +#else + + static stbir__inline stbir_uint64 STBIR_PROFILE_FUNC() + { + stbir_uint64 tsc; + asm volatile("mrs %0, cntvct_el0" : "=r" (tsc)); + return tsc; + } + +#endif + +#else // x64, arm + +#error Unknown platform for profiling. + +#endif // x64, arm + +#endif // STBIR_PROFILE_FUNC + +#define STBIR_ONLY_PROFILE_GET_SPLIT_INFO ,stbir__per_split_info * split_info +#define STBIR_ONLY_PROFILE_SET_SPLIT_INFO ,split_info + +#define STBIR_ONLY_PROFILE_BUILD_GET_INFO ,stbir__info * profile_info +#define STBIR_ONLY_PROFILE_BUILD_SET_INFO ,profile_info + +// super light-weight micro profiler +#define STBIR_PROFILE_START_ll( info, wh ) { stbir_uint64 wh##thiszonetime = STBIR_PROFILE_FUNC(); stbir_uint64 * wh##save_parent_excluded_ptr = info->current_zone_excluded_ptr; stbir_uint64 wh##current_zone_excluded = 0; info->current_zone_excluded_ptr = &wh##current_zone_excluded; +#define STBIR_PROFILE_END_ll( info, wh ) wh##thiszonetime = STBIR_PROFILE_FUNC() - wh##thiszonetime; info->profile.named.wh += wh##thiszonetime - wh##current_zone_excluded; *wh##save_parent_excluded_ptr += wh##thiszonetime; info->current_zone_excluded_ptr = wh##save_parent_excluded_ptr; } +#define STBIR_PROFILE_FIRST_START_ll( info, wh ) { int i; info->current_zone_excluded_ptr = &info->profile.named.total; for(i=0;i<STBIR__ARRAY_SIZE(info->profile.array);i++) info->profile.array[i]=0; } STBIR_PROFILE_START_ll( info, wh ); +#define STBIR_PROFILE_CLEAR_EXTRAS_ll( info, num ) { int extra; for(extra=1;extra<(num);extra++) { int i; for(i=0;i<STBIR__ARRAY_SIZE((info)->profile.array);i++) (info)[extra].profile.array[i]=0; } } + +// for thread data +#define STBIR_PROFILE_START( wh ) STBIR_PROFILE_START_ll( split_info, wh ) +#define STBIR_PROFILE_END( wh ) STBIR_PROFILE_END_ll( split_info, wh ) +#define STBIR_PROFILE_FIRST_START( wh ) STBIR_PROFILE_FIRST_START_ll( split_info, wh ) +#define STBIR_PROFILE_CLEAR_EXTRAS() STBIR_PROFILE_CLEAR_EXTRAS_ll( split_info, split_count ) + +// for build data +#define STBIR_PROFILE_BUILD_START( wh ) STBIR_PROFILE_START_ll( profile_info, wh ) +#define STBIR_PROFILE_BUILD_END( wh ) STBIR_PROFILE_END_ll( profile_info, wh ) +#define STBIR_PROFILE_BUILD_FIRST_START( wh ) STBIR_PROFILE_FIRST_START_ll( profile_info, wh ) +#define STBIR_PROFILE_BUILD_CLEAR( info ) { int i; for(i=0;i<STBIR__ARRAY_SIZE(info->profile.array);i++) info->profile.array[i]=0; } + +#else // no profile + +#define STBIR_ONLY_PROFILE_GET_SPLIT_INFO +#define STBIR_ONLY_PROFILE_SET_SPLIT_INFO + +#define STBIR_ONLY_PROFILE_BUILD_GET_INFO +#define STBIR_ONLY_PROFILE_BUILD_SET_INFO + +#define STBIR_PROFILE_START( wh ) +#define STBIR_PROFILE_END( wh ) +#define STBIR_PROFILE_FIRST_START( wh ) +#define STBIR_PROFILE_CLEAR_EXTRAS( ) + +#define STBIR_PROFILE_BUILD_START( wh ) +#define STBIR_PROFILE_BUILD_END( wh ) +#define STBIR_PROFILE_BUILD_FIRST_START( wh ) +#define STBIR_PROFILE_BUILD_CLEAR( info ) + +#endif // stbir_profile + +#ifndef STBIR_CEILF +#include <math.h> +#if _MSC_VER <= 1200 // support VC6 for Sean +#define STBIR_CEILF(x) ((float)ceil((float)(x))) +#define STBIR_FLOORF(x) ((float)floor((float)(x))) +#else +#define STBIR_CEILF(x) ceilf(x) +#define STBIR_FLOORF(x) floorf(x) +#endif +#endif + +#ifndef STBIR_MEMCPY +// For memcpy +#include <string.h> +#define STBIR_MEMCPY( dest, src, len ) memcpy( dest, src, len ) +#endif + +#ifndef STBIR_SIMD + +// memcpy that is specifically intentionally overlapping (src is smaller then dest, so can be +// a normal forward copy, bytes is divisible by 4 and bytes is greater than or equal to +// the diff between dest and src) +static void stbir_overlapping_memcpy( void * dest, void const * src, size_t bytes ) +{ + char STBIR_SIMD_STREAMOUT_PTR (*) sd = (char*) src; + char STBIR_SIMD_STREAMOUT_PTR( * ) s_end = ((char*) src) + bytes; + ptrdiff_t ofs_to_dest = (char*)dest - (char*)src; + + if ( ofs_to_dest >= 8 ) // is the overlap more than 8 away? + { + char STBIR_SIMD_STREAMOUT_PTR( * ) s_end8 = ((char*) src) + (bytes&~7); + STBIR_NO_UNROLL_LOOP_START + do + { + STBIR_NO_UNROLL(sd); + *(stbir_uint64*)( sd + ofs_to_dest ) = *(stbir_uint64*) sd; + sd += 8; + } while ( sd < s_end8 ); + + if ( sd == s_end ) + return; + } + + STBIR_NO_UNROLL_LOOP_START + do + { + STBIR_NO_UNROLL(sd); + *(int*)( sd + ofs_to_dest ) = *(int*) sd; + sd += 4; + } while ( sd < s_end ); +} + +#endif + +static float stbir__filter_trapezoid(float x, float scale, void * user_data) +{ + float halfscale = scale / 2; + float t = 0.5f + halfscale; + STBIR_ASSERT(scale <= 1); + STBIR__UNUSED(user_data); + + if ( x < 0.0f ) x = -x; + + if (x >= t) + return 0.0f; + else + { + float r = 0.5f - halfscale; + if (x <= r) + return 1.0f; + else + return (t - x) / scale; + } +} + +static float stbir__support_trapezoid(float scale, void * user_data) +{ + STBIR__UNUSED(user_data); + return 0.5f + scale / 2.0f; +} + +static float stbir__filter_triangle(float x, float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + + if ( x < 0.0f ) x = -x; + + if (x <= 1.0f) + return 1.0f - x; + else + return 0.0f; +} + +static float stbir__filter_point(float x, float s, void * user_data) +{ + STBIR__UNUSED(x); + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + + return 1.0f; +} + +static float stbir__filter_cubic(float x, float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + + if ( x < 0.0f ) x = -x; + + if (x < 1.0f) + return (4.0f + x*x*(3.0f*x - 6.0f))/6.0f; + else if (x < 2.0f) + return (8.0f + x*(-12.0f + x*(6.0f - x)))/6.0f; + + return (0.0f); +} + +static float stbir__filter_catmullrom(float x, float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + + if ( x < 0.0f ) x = -x; + + if (x < 1.0f) + return 1.0f - x*x*(2.5f - 1.5f*x); + else if (x < 2.0f) + return 2.0f - x*(4.0f + x*(0.5f*x - 2.5f)); + + return (0.0f); +} + +static float stbir__filter_mitchell(float x, float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + + if ( x < 0.0f ) x = -x; + + if (x < 1.0f) + return (16.0f + x*x*(21.0f * x - 36.0f))/18.0f; + else if (x < 2.0f) + return (32.0f + x*(-60.0f + x*(36.0f - 7.0f*x)))/18.0f; + + return (0.0f); +} + +static float stbir__support_zeropoint5(float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + return 0.5f; +} + +static float stbir__support_one(float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + return 1; +} + +static float stbir__support_two(float s, void * user_data) +{ + STBIR__UNUSED(s); + STBIR__UNUSED(user_data); + return 2; +} + +// This is the maximum number of input samples that can affect an output sample +// with the given filter from the output pixel's perspective +static int stbir__get_filter_pixel_width(stbir__support_callback * support, float scale, void * user_data) +{ + STBIR_ASSERT(support != 0); + + if ( scale >= ( 1.0f-stbir__small_float ) ) // upscale + return (int)STBIR_CEILF(support(1.0f/scale,user_data) * 2.0f); + else + return (int)STBIR_CEILF(support(scale,user_data) * 2.0f / scale); +} + +// this is how many coefficents per run of the filter (which is different +// from the filter_pixel_width depending on if we are scattering or gathering) +static int stbir__get_coefficient_width(stbir__sampler * samp, int is_gather, void * user_data) +{ + float scale = samp->scale_info.scale; + stbir__support_callback * support = samp->filter_support; + + switch( is_gather ) + { + case 1: + return (int)STBIR_CEILF(support(1.0f / scale, user_data) * 2.0f); + case 2: + return (int)STBIR_CEILF(support(scale, user_data) * 2.0f / scale); + case 0: + return (int)STBIR_CEILF(support(scale, user_data) * 2.0f); + default: + STBIR_ASSERT( (is_gather >= 0 ) && (is_gather <= 2 ) ); + return 0; + } +} + +static int stbir__get_contributors(stbir__sampler * samp, int is_gather) +{ + if (is_gather) + return samp->scale_info.output_sub_size; + else + return (samp->scale_info.input_full_size + samp->filter_pixel_margin * 2); +} + +static int stbir__edge_zero_full( int n, int max ) +{ + STBIR__UNUSED(n); + STBIR__UNUSED(max); + return 0; // NOTREACHED +} + +static int stbir__edge_clamp_full( int n, int max ) +{ + if (n < 0) + return 0; + + if (n >= max) + return max - 1; + + return n; // NOTREACHED +} + +static int stbir__edge_reflect_full( int n, int max ) +{ + if (n < 0) + { + if (n > -max) + return -n; + else + return max - 1; + } + + if (n >= max) + { + int max2 = max * 2; + if (n >= max2) + return 0; + else + return max2 - n - 1; + } + + return n; // NOTREACHED +} + +static int stbir__edge_wrap_full( int n, int max ) +{ + if (n >= 0) + return (n % max); + else + { + int m = (-n) % max; + + if (m != 0) + m = max - m; + + return (m); + } +} + +typedef int stbir__edge_wrap_func( int n, int max ); +static stbir__edge_wrap_func * stbir__edge_wrap_slow[] = +{ + stbir__edge_clamp_full, // STBIR_EDGE_CLAMP + stbir__edge_reflect_full, // STBIR_EDGE_REFLECT + stbir__edge_wrap_full, // STBIR_EDGE_WRAP + stbir__edge_zero_full, // STBIR_EDGE_ZERO +}; + +stbir__inline static int stbir__edge_wrap(stbir_edge edge, int n, int max) +{ + // avoid per-pixel switch + if (n >= 0 && n < max) + return n; + return stbir__edge_wrap_slow[edge]( n, max ); +} + +#define STBIR__MERGE_RUNS_PIXEL_THRESHOLD 16 + +// get information on the extents of a sampler +static void stbir__get_extents( stbir__sampler * samp, stbir__extents * scanline_extents ) +{ + int j, stop; + int left_margin, right_margin; + int min_n = 0x7fffffff, max_n = -0x7fffffff; + int min_left = 0x7fffffff, max_left = -0x7fffffff; + int min_right = 0x7fffffff, max_right = -0x7fffffff; + stbir_edge edge = samp->edge; + stbir__contributors* contributors = samp->contributors; + int output_sub_size = samp->scale_info.output_sub_size; + int input_full_size = samp->scale_info.input_full_size; + int filter_pixel_margin = samp->filter_pixel_margin; + + STBIR_ASSERT( samp->is_gather ); + + stop = output_sub_size; + for (j = 0; j < stop; j++ ) + { + STBIR_ASSERT( contributors[j].n1 >= contributors[j].n0 ); + if ( contributors[j].n0 < min_n ) + { + min_n = contributors[j].n0; + stop = j + filter_pixel_margin; // if we find a new min, only scan another filter width + if ( stop > output_sub_size ) stop = output_sub_size; + } + } + + stop = 0; + for (j = output_sub_size - 1; j >= stop; j-- ) + { + STBIR_ASSERT( contributors[j].n1 >= contributors[j].n0 ); + if ( contributors[j].n1 > max_n ) + { + max_n = contributors[j].n1; + stop = j - filter_pixel_margin; // if we find a new max, only scan another filter width + if (stop<0) stop = 0; + } + } + + STBIR_ASSERT( scanline_extents->conservative.n0 <= min_n ); + STBIR_ASSERT( scanline_extents->conservative.n1 >= max_n ); + + // now calculate how much into the margins we really read + left_margin = 0; + if ( min_n < 0 ) + { + left_margin = -min_n; + min_n = 0; + } + + right_margin = 0; + if ( max_n >= input_full_size ) + { + right_margin = max_n - input_full_size + 1; + max_n = input_full_size - 1; + } + + // index 1 is margin pixel extents (how many pixels we hang over the edge) + scanline_extents->edge_sizes[0] = left_margin; + scanline_extents->edge_sizes[1] = right_margin; + + // index 2 is pixels read from the input + scanline_extents->spans[0].n0 = min_n; + scanline_extents->spans[0].n1 = max_n; + scanline_extents->spans[0].pixel_offset_for_input = min_n; + + // default to no other input range + scanline_extents->spans[1].n0 = 0; + scanline_extents->spans[1].n1 = -1; + scanline_extents->spans[1].pixel_offset_for_input = 0; + + // don't have to do edge calc for zero clamp + if ( edge == STBIR_EDGE_ZERO ) + return; + + // convert margin pixels to the pixels within the input (min and max) + for( j = -left_margin ; j < 0 ; j++ ) + { + int p = stbir__edge_wrap( edge, j, input_full_size ); + if ( p < min_left ) + min_left = p; + if ( p > max_left ) + max_left = p; + } + + for( j = input_full_size ; j < (input_full_size + right_margin) ; j++ ) + { + int p = stbir__edge_wrap( edge, j, input_full_size ); + if ( p < min_right ) + min_right = p; + if ( p > max_right ) + max_right = p; + } + + // merge the left margin pixel region if it connects within 4 pixels of main pixel region + if ( min_left != 0x7fffffff ) + { + if ( ( ( min_left <= min_n ) && ( ( max_left + STBIR__MERGE_RUNS_PIXEL_THRESHOLD ) >= min_n ) ) || + ( ( min_n <= min_left ) && ( ( max_n + STBIR__MERGE_RUNS_PIXEL_THRESHOLD ) >= max_left ) ) ) + { + scanline_extents->spans[0].n0 = min_n = stbir__min( min_n, min_left ); + scanline_extents->spans[0].n1 = max_n = stbir__max( max_n, max_left ); + scanline_extents->spans[0].pixel_offset_for_input = min_n; + left_margin = 0; + } + } + + // merge the right margin pixel region if it connects within 4 pixels of main pixel region + if ( min_right != 0x7fffffff ) + { + if ( ( ( min_right <= min_n ) && ( ( max_right + STBIR__MERGE_RUNS_PIXEL_THRESHOLD ) >= min_n ) ) || + ( ( min_n <= min_right ) && ( ( max_n + STBIR__MERGE_RUNS_PIXEL_THRESHOLD ) >= max_right ) ) ) + { + scanline_extents->spans[0].n0 = min_n = stbir__min( min_n, min_right ); + scanline_extents->spans[0].n1 = max_n = stbir__max( max_n, max_right ); + scanline_extents->spans[0].pixel_offset_for_input = min_n; + right_margin = 0; + } + } + + STBIR_ASSERT( scanline_extents->conservative.n0 <= min_n ); + STBIR_ASSERT( scanline_extents->conservative.n1 >= max_n ); + + // you get two ranges when you have the WRAP edge mode and you are doing just the a piece of the resize + // so you need to get a second run of pixels from the opposite side of the scanline (which you + // wouldn't need except for WRAP) + + + // if we can't merge the min_left range, add it as a second range + if ( ( left_margin ) && ( min_left != 0x7fffffff ) ) + { + stbir__span * newspan = scanline_extents->spans + 1; + STBIR_ASSERT( right_margin == 0 ); + if ( min_left < scanline_extents->spans[0].n0 ) + { + scanline_extents->spans[1].pixel_offset_for_input = scanline_extents->spans[0].n0; + scanline_extents->spans[1].n0 = scanline_extents->spans[0].n0; + scanline_extents->spans[1].n1 = scanline_extents->spans[0].n1; + --newspan; + } + newspan->pixel_offset_for_input = min_left; + newspan->n0 = -left_margin; + newspan->n1 = ( max_left - min_left ) - left_margin; + scanline_extents->edge_sizes[0] = 0; // don't need to copy the left margin, since we are directly decoding into the margin + return; + } + + // if we can't merge the min_left range, add it as a second range + if ( ( right_margin ) && ( min_right != 0x7fffffff ) ) + { + stbir__span * newspan = scanline_extents->spans + 1; + if ( min_right < scanline_extents->spans[0].n0 ) + { + scanline_extents->spans[1].pixel_offset_for_input = scanline_extents->spans[0].n0; + scanline_extents->spans[1].n0 = scanline_extents->spans[0].n0; + scanline_extents->spans[1].n1 = scanline_extents->spans[0].n1; + --newspan; + } + newspan->pixel_offset_for_input = min_right; + newspan->n0 = scanline_extents->spans[1].n1 + 1; + newspan->n1 = scanline_extents->spans[1].n1 + 1 + ( max_right - min_right ); + scanline_extents->edge_sizes[1] = 0; // don't need to copy the right margin, since we are directly decoding into the margin + return; + } +} + +static void stbir__calculate_in_pixel_range( int * first_pixel, int * last_pixel, float out_pixel_center, float out_filter_radius, float inv_scale, float out_shift, int input_size, stbir_edge edge ) +{ + int first, last; + float out_pixel_influence_lowerbound = out_pixel_center - out_filter_radius; + float out_pixel_influence_upperbound = out_pixel_center + out_filter_radius; + + float in_pixel_influence_lowerbound = (out_pixel_influence_lowerbound + out_shift) * inv_scale; + float in_pixel_influence_upperbound = (out_pixel_influence_upperbound + out_shift) * inv_scale; + + first = (int)(STBIR_FLOORF(in_pixel_influence_lowerbound + 0.5f)); + last = (int)(STBIR_FLOORF(in_pixel_influence_upperbound - 0.5f)); + if ( last < first ) last = first; // point sample mode can span a value *right* at 0.5, and cause these to cross + + if ( edge == STBIR_EDGE_WRAP ) + { + if ( first < -input_size ) + first = -input_size; + if ( last >= (input_size*2)) + last = (input_size*2) - 1; + } + + *first_pixel = first; + *last_pixel = last; +} + +static void stbir__calculate_coefficients_for_gather_upsample( float out_filter_radius, stbir__kernel_callback * kernel, stbir__scale_info * scale_info, int num_contributors, stbir__contributors* contributors, float* coefficient_group, int coefficient_width, stbir_edge edge, void * user_data ) +{ + int n, end; + float inv_scale = scale_info->inv_scale; + float out_shift = scale_info->pixel_shift; + int input_size = scale_info->input_full_size; + int numerator = scale_info->scale_numerator; + int polyphase = ( ( scale_info->scale_is_rational ) && ( numerator < num_contributors ) ); + + // Looping through out pixels + end = num_contributors; if ( polyphase ) end = numerator; + for (n = 0; n < end; n++) + { + int i; + int last_non_zero; + float out_pixel_center = (float)n + 0.5f; + float in_center_of_out = (out_pixel_center + out_shift) * inv_scale; + + int in_first_pixel, in_last_pixel; + + stbir__calculate_in_pixel_range( &in_first_pixel, &in_last_pixel, out_pixel_center, out_filter_radius, inv_scale, out_shift, input_size, edge ); + + // make sure we never generate a range larger than our precalculated coeff width + // this only happens in point sample mode, but it's a good safe thing to do anyway + if ( ( in_last_pixel - in_first_pixel + 1 ) > coefficient_width ) + in_last_pixel = in_first_pixel + coefficient_width - 1; + + last_non_zero = -1; + for (i = 0; i <= in_last_pixel - in_first_pixel; i++) + { + float in_pixel_center = (float)(i + in_first_pixel) + 0.5f; + float coeff = kernel(in_center_of_out - in_pixel_center, inv_scale, user_data); + + // kill denormals + if ( ( ( coeff < stbir__small_float ) && ( coeff > -stbir__small_float ) ) ) + { + if ( i == 0 ) // if we're at the front, just eat zero contributors + { + STBIR_ASSERT ( ( in_last_pixel - in_first_pixel ) != 0 ); // there should be at least one contrib + ++in_first_pixel; + i--; + continue; + } + coeff = 0; // make sure is fully zero (should keep denormals away) + } + else + last_non_zero = i; + + coefficient_group[i] = coeff; + } + + in_last_pixel = last_non_zero+in_first_pixel; // kills trailing zeros + contributors->n0 = in_first_pixel; + contributors->n1 = in_last_pixel; + + STBIR_ASSERT(contributors->n1 >= contributors->n0); + + ++contributors; + coefficient_group += coefficient_width; + } +} + +static void stbir__insert_coeff( stbir__contributors * contribs, float * coeffs, int new_pixel, float new_coeff, int max_width ) +{ + if ( new_pixel <= contribs->n1 ) // before the end + { + if ( new_pixel < contribs->n0 ) // before the front? + { + if ( ( contribs->n1 - new_pixel + 1 ) <= max_width ) + { + int j, o = contribs->n0 - new_pixel; + for ( j = contribs->n1 - contribs->n0 ; j <= 0 ; j-- ) + coeffs[ j + o ] = coeffs[ j ]; + for ( j = 1 ; j < o ; j-- ) + coeffs[ j ] = coeffs[ 0 ]; + coeffs[ 0 ] = new_coeff; + contribs->n0 = new_pixel; + } + } + else + { + coeffs[ new_pixel - contribs->n0 ] += new_coeff; + } + } + else + { + if ( ( new_pixel - contribs->n0 + 1 ) <= max_width ) + { + int j, e = new_pixel - contribs->n0; + for( j = ( contribs->n1 - contribs->n0 ) + 1 ; j < e ; j++ ) // clear in-betweens coeffs if there are any + coeffs[j] = 0; + + coeffs[ e ] = new_coeff; + contribs->n1 = new_pixel; + } + } +} + +static void stbir__calculate_out_pixel_range( int * first_pixel, int * last_pixel, float in_pixel_center, float in_pixels_radius, float scale, float out_shift, int out_size ) +{ + float in_pixel_influence_lowerbound = in_pixel_center - in_pixels_radius; + float in_pixel_influence_upperbound = in_pixel_center + in_pixels_radius; + float out_pixel_influence_lowerbound = in_pixel_influence_lowerbound * scale - out_shift; + float out_pixel_influence_upperbound = in_pixel_influence_upperbound * scale - out_shift; + int out_first_pixel = (int)(STBIR_FLOORF(out_pixel_influence_lowerbound + 0.5f)); + int out_last_pixel = (int)(STBIR_FLOORF(out_pixel_influence_upperbound - 0.5f)); + + if ( out_first_pixel < 0 ) + out_first_pixel = 0; + if ( out_last_pixel >= out_size ) + out_last_pixel = out_size - 1; + *first_pixel = out_first_pixel; + *last_pixel = out_last_pixel; +} + +static void stbir__calculate_coefficients_for_gather_downsample( int start, int end, float in_pixels_radius, stbir__kernel_callback * kernel, stbir__scale_info * scale_info, int coefficient_width, int num_contributors, stbir__contributors * contributors, float * coefficient_group, void * user_data ) +{ + int in_pixel; + int i; + int first_out_inited = -1; + float scale = scale_info->scale; + float out_shift = scale_info->pixel_shift; + int out_size = scale_info->output_sub_size; + int numerator = scale_info->scale_numerator; + int polyphase = ( ( scale_info->scale_is_rational ) && ( numerator < out_size ) ); + + STBIR__UNUSED(num_contributors); + + // Loop through the input pixels + for (in_pixel = start; in_pixel < end; in_pixel++) + { + float in_pixel_center = (float)in_pixel + 0.5f; + float out_center_of_in = in_pixel_center * scale - out_shift; + int out_first_pixel, out_last_pixel; + + stbir__calculate_out_pixel_range( &out_first_pixel, &out_last_pixel, in_pixel_center, in_pixels_radius, scale, out_shift, out_size ); + + if ( out_first_pixel > out_last_pixel ) + continue; + + // clamp or exit if we are using polyphase filtering, and the limit is up + if ( polyphase ) + { + // when polyphase, you only have to do coeffs up to the numerator count + if ( out_first_pixel == numerator ) + break; + + // don't do any extra work, clamp last pixel at numerator too + if ( out_last_pixel >= numerator ) + out_last_pixel = numerator - 1; + } + + for (i = 0; i <= out_last_pixel - out_first_pixel; i++) + { + float out_pixel_center = (float)(i + out_first_pixel) + 0.5f; + float x = out_pixel_center - out_center_of_in; + float coeff = kernel(x, scale, user_data) * scale; + + // kill the coeff if it's too small (avoid denormals) + if ( ( ( coeff < stbir__small_float ) && ( coeff > -stbir__small_float ) ) ) + coeff = 0.0f; + + { + int out = i + out_first_pixel; + float * coeffs = coefficient_group + out * coefficient_width; + stbir__contributors * contribs = contributors + out; + + // is this the first time this output pixel has been seen? Init it. + if ( out > first_out_inited ) + { + STBIR_ASSERT( out == ( first_out_inited + 1 ) ); // ensure we have only advanced one at time + first_out_inited = out; + contribs->n0 = in_pixel; + contribs->n1 = in_pixel; + coeffs[0] = coeff; + } + else + { + // insert on end (always in order) + if ( coeffs[0] == 0.0f ) // if the first coefficent is zero, then zap it for this coeffs + { + STBIR_ASSERT( ( in_pixel - contribs->n0 ) == 1 ); // ensure that when we zap, we're at the 2nd pos + contribs->n0 = in_pixel; + } + contribs->n1 = in_pixel; + STBIR_ASSERT( ( in_pixel - contribs->n0 ) < coefficient_width ); + coeffs[in_pixel - contribs->n0] = coeff; + } + } + } + } +} + +#ifdef STBIR_RENORMALIZE_IN_FLOAT +#define STBIR_RENORM_TYPE float +#else +#define STBIR_RENORM_TYPE double +#endif + +static void stbir__cleanup_gathered_coefficients( stbir_edge edge, stbir__filter_extent_info* filter_info, stbir__scale_info * scale_info, int num_contributors, stbir__contributors* contributors, float * coefficient_group, int coefficient_width ) +{ + int input_size = scale_info->input_full_size; + int input_last_n1 = input_size - 1; + int n, end; + int lowest = 0x7fffffff; + int highest = -0x7fffffff; + int widest = -1; + int numerator = scale_info->scale_numerator; + int denominator = scale_info->scale_denominator; + int polyphase = ( ( scale_info->scale_is_rational ) && ( numerator < num_contributors ) ); + float * coeffs; + stbir__contributors * contribs; + + // weight all the coeffs for each sample + coeffs = coefficient_group; + contribs = contributors; + end = num_contributors; if ( polyphase ) end = numerator; + for (n = 0; n < end; n++) + { + int i; + STBIR_RENORM_TYPE filter_scale, total_filter = 0; + int e; + + // add all contribs + e = contribs->n1 - contribs->n0; + for( i = 0 ; i <= e ; i++ ) + { + total_filter += (STBIR_RENORM_TYPE) coeffs[i]; + STBIR_ASSERT( ( coeffs[i] >= -2.0f ) && ( coeffs[i] <= 2.0f ) ); // check for wonky weights + } + + // rescale + if ( ( total_filter < stbir__small_float ) && ( total_filter > -stbir__small_float ) ) + { + // all coeffs are extremely small, just zero it + contribs->n1 = contribs->n0; + coeffs[0] = 0.0f; + } + else + { + // if the total isn't 1.0, rescale everything + if ( ( total_filter < (1.0f-stbir__small_float) ) || ( total_filter > (1.0f+stbir__small_float) ) ) + { + filter_scale = ((STBIR_RENORM_TYPE)1.0) / total_filter; + + // scale them all + for (i = 0; i <= e; i++) + coeffs[i] = (float) ( coeffs[i] * filter_scale ); + } + } + ++contribs; + coeffs += coefficient_width; + } + + // if we have a rational for the scale, we can exploit the polyphaseness to not calculate + // most of the coefficients, so we copy them here + if ( polyphase ) + { + stbir__contributors * prev_contribs = contributors; + stbir__contributors * cur_contribs = contributors + numerator; + + for( n = numerator ; n < num_contributors ; n++ ) + { + cur_contribs->n0 = prev_contribs->n0 + denominator; + cur_contribs->n1 = prev_contribs->n1 + denominator; + ++cur_contribs; + ++prev_contribs; + } + stbir_overlapping_memcpy( coefficient_group + numerator * coefficient_width, coefficient_group, ( num_contributors - numerator ) * coefficient_width * sizeof( coeffs[ 0 ] ) ); + } + + coeffs = coefficient_group; + contribs = contributors; + + for (n = 0; n < num_contributors; n++) + { + int i; + + // in zero edge mode, just remove out of bounds contribs completely (since their weights are accounted for now) + if ( edge == STBIR_EDGE_ZERO ) + { + // shrink the right side if necessary + if ( contribs->n1 > input_last_n1 ) + contribs->n1 = input_last_n1; + + // shrink the left side + if ( contribs->n0 < 0 ) + { + int j, left, skips = 0; + + skips = -contribs->n0; + contribs->n0 = 0; + + // now move down the weights + left = contribs->n1 - contribs->n0 + 1; + if ( left > 0 ) + { + for( j = 0 ; j < left ; j++ ) + coeffs[ j ] = coeffs[ j + skips ]; + } + } + } + else if ( ( edge == STBIR_EDGE_CLAMP ) || ( edge == STBIR_EDGE_REFLECT ) ) + { + // for clamp and reflect, calculate the true inbounds position (based on edge type) and just add that to the existing weight + + // right hand side first + if ( contribs->n1 > input_last_n1 ) + { + int start = contribs->n0; + int endi = contribs->n1; + contribs->n1 = input_last_n1; + for( i = input_size; i <= endi; i++ ) + stbir__insert_coeff( contribs, coeffs, stbir__edge_wrap_slow[edge]( i, input_size ), coeffs[i-start], coefficient_width ); + } + + // now check left hand edge + if ( contribs->n0 < 0 ) + { + int save_n0; + float save_n0_coeff; + float * c = coeffs - ( contribs->n0 + 1 ); + + // reinsert the coeffs with it reflected or clamped (insert accumulates, if the coeffs exist) + for( i = -1 ; i > contribs->n0 ; i-- ) + stbir__insert_coeff( contribs, coeffs, stbir__edge_wrap_slow[edge]( i, input_size ), *c--, coefficient_width ); + save_n0 = contribs->n0; + save_n0_coeff = c[0]; // save it, since we didn't do the final one (i==n0), because there might be too many coeffs to hold (before we resize)! + + // now slide all the coeffs down (since we have accumulated them in the positive contribs) and reset the first contrib + contribs->n0 = 0; + for(i = 0 ; i <= contribs->n1 ; i++ ) + coeffs[i] = coeffs[i-save_n0]; + + // now that we have shrunk down the contribs, we insert the first one safely + stbir__insert_coeff( contribs, coeffs, stbir__edge_wrap_slow[edge]( save_n0, input_size ), save_n0_coeff, coefficient_width ); + } + } + + if ( contribs->n0 <= contribs->n1 ) + { + int diff = contribs->n1 - contribs->n0 + 1; + while ( diff && ( coeffs[ diff-1 ] == 0.0f ) ) + --diff; + + contribs->n1 = contribs->n0 + diff - 1; + + if ( contribs->n0 <= contribs->n1 ) + { + if ( contribs->n0 < lowest ) + lowest = contribs->n0; + if ( contribs->n1 > highest ) + highest = contribs->n1; + if ( diff > widest ) + widest = diff; + } + + // re-zero out unused coefficients (if any) + for( i = diff ; i < coefficient_width ; i++ ) + coeffs[i] = 0.0f; + } + + ++contribs; + coeffs += coefficient_width; + } + filter_info->lowest = lowest; + filter_info->highest = highest; + filter_info->widest = widest; +} + +#undef STBIR_RENORM_TYPE + +static int stbir__pack_coefficients( int num_contributors, stbir__contributors* contributors, float * coefficents, int coefficient_width, int widest, int row0, int row1 ) +{ + #define STBIR_MOVE_1( dest, src ) { STBIR_NO_UNROLL(dest); ((stbir_uint32*)(dest))[0] = ((stbir_uint32*)(src))[0]; } + #define STBIR_MOVE_2( dest, src ) { STBIR_NO_UNROLL(dest); ((stbir_uint64*)(dest))[0] = ((stbir_uint64*)(src))[0]; } + #ifdef STBIR_SIMD + #define STBIR_MOVE_4( dest, src ) { stbir__simdf t; STBIR_NO_UNROLL(dest); stbir__simdf_load( t, src ); stbir__simdf_store( dest, t ); } + #else + #define STBIR_MOVE_4( dest, src ) { STBIR_NO_UNROLL(dest); ((stbir_uint64*)(dest))[0] = ((stbir_uint64*)(src))[0]; ((stbir_uint64*)(dest))[1] = ((stbir_uint64*)(src))[1]; } + #endif + + int row_end = row1 + 1; + STBIR__UNUSED( row0 ); // only used in an assert + + if ( coefficient_width != widest ) + { + float * pc = coefficents; + float * coeffs = coefficents; + float * pc_end = coefficents + num_contributors * widest; + switch( widest ) + { + case 1: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_1( pc, coeffs ); + ++pc; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 2: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_2( pc, coeffs ); + pc += 2; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 3: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_2( pc, coeffs ); + STBIR_MOVE_1( pc+2, coeffs+2 ); + pc += 3; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 4: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + pc += 4; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 5: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_1( pc+4, coeffs+4 ); + pc += 5; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 6: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_2( pc+4, coeffs+4 ); + pc += 6; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 7: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_2( pc+4, coeffs+4 ); + STBIR_MOVE_1( pc+6, coeffs+6 ); + pc += 7; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 8: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_4( pc+4, coeffs+4 ); + pc += 8; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 9: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_4( pc+4, coeffs+4 ); + STBIR_MOVE_1( pc+8, coeffs+8 ); + pc += 9; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 10: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_4( pc+4, coeffs+4 ); + STBIR_MOVE_2( pc+8, coeffs+8 ); + pc += 10; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 11: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_4( pc+4, coeffs+4 ); + STBIR_MOVE_2( pc+8, coeffs+8 ); + STBIR_MOVE_1( pc+10, coeffs+10 ); + pc += 11; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + case 12: + STBIR_NO_UNROLL_LOOP_START + do { + STBIR_MOVE_4( pc, coeffs ); + STBIR_MOVE_4( pc+4, coeffs+4 ); + STBIR_MOVE_4( pc+8, coeffs+8 ); + pc += 12; + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + default: + STBIR_NO_UNROLL_LOOP_START + do { + float * copy_end = pc + widest - 4; + float * c = coeffs; + do { + STBIR_NO_UNROLL( pc ); + STBIR_MOVE_4( pc, c ); + pc += 4; + c += 4; + } while ( pc <= copy_end ); + copy_end += 4; + STBIR_NO_UNROLL_LOOP_START + while ( pc < copy_end ) + { + STBIR_MOVE_1( pc, c ); + ++pc; ++c; + } + coeffs += coefficient_width; + } while ( pc < pc_end ); + break; + } + } + + // some horizontal routines read one float off the end (which is then masked off), so put in a sentinal so we don't read an snan or denormal + coefficents[ widest * num_contributors ] = 8888.0f; + + // the minimum we might read for unrolled filters widths is 12. So, we need to + // make sure we never read outside the decode buffer, by possibly moving + // the sample area back into the scanline, and putting zeros weights first. + // we start on the right edge and check until we're well past the possible + // clip area (2*widest). + { + stbir__contributors * contribs = contributors + num_contributors - 1; + float * coeffs = coefficents + widest * ( num_contributors - 1 ); + + // go until no chance of clipping (this is usually less than 8 lops) + while ( ( contribs >= contributors ) && ( ( contribs->n0 + widest*2 ) >= row_end ) ) + { + // might we clip?? + if ( ( contribs->n0 + widest ) > row_end ) + { + int stop_range = widest; + + // if range is larger than 12, it will be handled by generic loops that can terminate on the exact length + // of this contrib n1, instead of a fixed widest amount - so calculate this + if ( widest > 12 ) + { + int mod; + + // how far will be read in the n_coeff loop (which depends on the widest count mod4); + mod = widest & 3; + stop_range = ( ( ( contribs->n1 - contribs->n0 + 1 ) - mod + 3 ) & ~3 ) + mod; + + // the n_coeff loops do a minimum amount of coeffs, so factor that in! + if ( stop_range < ( 8 + mod ) ) stop_range = 8 + mod; + } + + // now see if we still clip with the refined range + if ( ( contribs->n0 + stop_range ) > row_end ) + { + int new_n0 = row_end - stop_range; + int num = contribs->n1 - contribs->n0 + 1; + int backup = contribs->n0 - new_n0; + float * from_co = coeffs + num - 1; + float * to_co = from_co + backup; + + STBIR_ASSERT( ( new_n0 >= row0 ) && ( new_n0 < contribs->n0 ) ); + + // move the coeffs over + while( num ) + { + *to_co-- = *from_co--; + --num; + } + // zero new positions + while ( to_co >= coeffs ) + *to_co-- = 0; + // set new start point + contribs->n0 = new_n0; + if ( widest > 12 ) + { + int mod; + + // how far will be read in the n_coeff loop (which depends on the widest count mod4); + mod = widest & 3; + stop_range = ( ( ( contribs->n1 - contribs->n0 + 1 ) - mod + 3 ) & ~3 ) + mod; + + // the n_coeff loops do a minimum amount of coeffs, so factor that in! + if ( stop_range < ( 8 + mod ) ) stop_range = 8 + mod; + } + } + } + --contribs; + coeffs -= widest; + } + } + + return widest; + #undef STBIR_MOVE_1 + #undef STBIR_MOVE_2 + #undef STBIR_MOVE_4 +} + +static void stbir__calculate_filters( stbir__sampler * samp, stbir__sampler * other_axis_for_pivot, void * user_data STBIR_ONLY_PROFILE_BUILD_GET_INFO ) +{ + int n; + float scale = samp->scale_info.scale; + stbir__kernel_callback * kernel = samp->filter_kernel; + stbir__support_callback * support = samp->filter_support; + float inv_scale = samp->scale_info.inv_scale; + int input_full_size = samp->scale_info.input_full_size; + int gather_num_contributors = samp->num_contributors; + stbir__contributors* gather_contributors = samp->contributors; + float * gather_coeffs = samp->coefficients; + int gather_coefficient_width = samp->coefficient_width; + + switch ( samp->is_gather ) + { + case 1: // gather upsample + { + float out_pixels_radius = support(inv_scale,user_data) * scale; + + stbir__calculate_coefficients_for_gather_upsample( out_pixels_radius, kernel, &samp->scale_info, gather_num_contributors, gather_contributors, gather_coeffs, gather_coefficient_width, samp->edge, user_data ); + + STBIR_PROFILE_BUILD_START( cleanup ); + stbir__cleanup_gathered_coefficients( samp->edge, &samp->extent_info, &samp->scale_info, gather_num_contributors, gather_contributors, gather_coeffs, gather_coefficient_width ); + STBIR_PROFILE_BUILD_END( cleanup ); + } + break; + + case 0: // scatter downsample (only on vertical) + case 2: // gather downsample + { + float in_pixels_radius = support(scale,user_data) * inv_scale; + int filter_pixel_margin = samp->filter_pixel_margin; + int input_end = input_full_size + filter_pixel_margin; + + // if this is a scatter, we do a downsample gather to get the coeffs, and then pivot after + if ( !samp->is_gather ) + { + // check if we are using the same gather downsample on the horizontal as this vertical, + // if so, then we don't have to generate them, we can just pivot from the horizontal. + if ( other_axis_for_pivot ) + { + gather_contributors = other_axis_for_pivot->contributors; + gather_coeffs = other_axis_for_pivot->coefficients; + gather_coefficient_width = other_axis_for_pivot->coefficient_width; + gather_num_contributors = other_axis_for_pivot->num_contributors; + samp->extent_info.lowest = other_axis_for_pivot->extent_info.lowest; + samp->extent_info.highest = other_axis_for_pivot->extent_info.highest; + samp->extent_info.widest = other_axis_for_pivot->extent_info.widest; + goto jump_right_to_pivot; + } + + gather_contributors = samp->gather_prescatter_contributors; + gather_coeffs = samp->gather_prescatter_coefficients; + gather_coefficient_width = samp->gather_prescatter_coefficient_width; + gather_num_contributors = samp->gather_prescatter_num_contributors; + } + + stbir__calculate_coefficients_for_gather_downsample( -filter_pixel_margin, input_end, in_pixels_radius, kernel, &samp->scale_info, gather_coefficient_width, gather_num_contributors, gather_contributors, gather_coeffs, user_data ); + + STBIR_PROFILE_BUILD_START( cleanup ); + stbir__cleanup_gathered_coefficients( samp->edge, &samp->extent_info, &samp->scale_info, gather_num_contributors, gather_contributors, gather_coeffs, gather_coefficient_width ); + STBIR_PROFILE_BUILD_END( cleanup ); + + if ( !samp->is_gather ) + { + // if this is a scatter (vertical only), then we need to pivot the coeffs + stbir__contributors * scatter_contributors; + int highest_set; + + jump_right_to_pivot: + + STBIR_PROFILE_BUILD_START( pivot ); + + highest_set = (-filter_pixel_margin) - 1; + for (n = 0; n < gather_num_contributors; n++) + { + int k; + int gn0 = gather_contributors->n0, gn1 = gather_contributors->n1; + int scatter_coefficient_width = samp->coefficient_width; + float * scatter_coeffs = samp->coefficients + ( gn0 + filter_pixel_margin ) * scatter_coefficient_width; + float * g_coeffs = gather_coeffs; + scatter_contributors = samp->contributors + ( gn0 + filter_pixel_margin ); + + for (k = gn0 ; k <= gn1 ; k++ ) + { + float gc = *g_coeffs++; + + // skip zero and denormals - must skip zeros to avoid adding coeffs beyond scatter_coefficient_width + // (which happens when pivoting from horizontal, which might have dummy zeros) + if ( ( ( gc >= stbir__small_float ) || ( gc <= -stbir__small_float ) ) ) + { + if ( ( k > highest_set ) || ( scatter_contributors->n0 > scatter_contributors->n1 ) ) + { + { + // if we are skipping over several contributors, we need to clear the skipped ones + stbir__contributors * clear_contributors = samp->contributors + ( highest_set + filter_pixel_margin + 1); + while ( clear_contributors < scatter_contributors ) + { + clear_contributors->n0 = 0; + clear_contributors->n1 = -1; + ++clear_contributors; + } + } + scatter_contributors->n0 = n; + scatter_contributors->n1 = n; + scatter_coeffs[0] = gc; + highest_set = k; + } + else + { + stbir__insert_coeff( scatter_contributors, scatter_coeffs, n, gc, scatter_coefficient_width ); + } + STBIR_ASSERT( ( scatter_contributors->n1 - scatter_contributors->n0 + 1 ) <= scatter_coefficient_width ); + } + ++scatter_contributors; + scatter_coeffs += scatter_coefficient_width; + } + + ++gather_contributors; + gather_coeffs += gather_coefficient_width; + } + + // now clear any unset contribs + { + stbir__contributors * clear_contributors = samp->contributors + ( highest_set + filter_pixel_margin + 1); + stbir__contributors * end_contributors = samp->contributors + samp->num_contributors; + while ( clear_contributors < end_contributors ) + { + clear_contributors->n0 = 0; + clear_contributors->n1 = -1; + ++clear_contributors; + } + } + + STBIR_PROFILE_BUILD_END( pivot ); + } + } + break; + } +} + + +//======================================================================================================== +// scanline decoders and encoders + +#define stbir__coder_min_num 1 +#define STB_IMAGE_RESIZE_DO_CODERS +#include STBIR__HEADER_FILENAME + +#define stbir__decode_suffix BGRA +#define stbir__decode_swizzle +#define stbir__decode_order0 2 +#define stbir__decode_order1 1 +#define stbir__decode_order2 0 +#define stbir__decode_order3 3 +#define stbir__encode_order0 2 +#define stbir__encode_order1 1 +#define stbir__encode_order2 0 +#define stbir__encode_order3 3 +#define stbir__coder_min_num 4 +#define STB_IMAGE_RESIZE_DO_CODERS +#include STBIR__HEADER_FILENAME + +#define stbir__decode_suffix ARGB +#define stbir__decode_swizzle +#define stbir__decode_order0 1 +#define stbir__decode_order1 2 +#define stbir__decode_order2 3 +#define stbir__decode_order3 0 +#define stbir__encode_order0 3 +#define stbir__encode_order1 0 +#define stbir__encode_order2 1 +#define stbir__encode_order3 2 +#define stbir__coder_min_num 4 +#define STB_IMAGE_RESIZE_DO_CODERS +#include STBIR__HEADER_FILENAME + +#define stbir__decode_suffix ABGR +#define stbir__decode_swizzle +#define stbir__decode_order0 3 +#define stbir__decode_order1 2 +#define stbir__decode_order2 1 +#define stbir__decode_order3 0 +#define stbir__encode_order0 3 +#define stbir__encode_order1 2 +#define stbir__encode_order2 1 +#define stbir__encode_order3 0 +#define stbir__coder_min_num 4 +#define STB_IMAGE_RESIZE_DO_CODERS +#include STBIR__HEADER_FILENAME + +#define stbir__decode_suffix AR +#define stbir__decode_swizzle +#define stbir__decode_order0 1 +#define stbir__decode_order1 0 +#define stbir__decode_order2 3 +#define stbir__decode_order3 2 +#define stbir__encode_order0 1 +#define stbir__encode_order1 0 +#define stbir__encode_order2 3 +#define stbir__encode_order3 2 +#define stbir__coder_min_num 2 +#define STB_IMAGE_RESIZE_DO_CODERS +#include STBIR__HEADER_FILENAME + + +// fancy alpha means we expand to keep both premultipied and non-premultiplied color channels +static void stbir__fancy_alpha_weight_4ch( float * out_buffer, int width_times_channels ) +{ + float STBIR_STREAMOUT_PTR(*) out = out_buffer; + float const * end_decode = out_buffer + ( width_times_channels / 4 ) * 7; // decode buffer aligned to end of out_buffer + float STBIR_STREAMOUT_PTR(*) decode = (float*)end_decode - width_times_channels; + + // fancy alpha is stored internally as R G B A Rpm Gpm Bpm + + #ifdef STBIR_SIMD + + #ifdef STBIR_SIMD8 + decode += 16; + STBIR_NO_UNROLL_LOOP_START + while ( decode <= end_decode ) + { + stbir__simdf8 d0,d1,a0,a1,p0,p1; + STBIR_NO_UNROLL(decode); + stbir__simdf8_load( d0, decode-16 ); + stbir__simdf8_load( d1, decode-16+8 ); + stbir__simdf8_0123to33333333( a0, d0 ); + stbir__simdf8_0123to33333333( a1, d1 ); + stbir__simdf8_mult( p0, a0, d0 ); + stbir__simdf8_mult( p1, a1, d1 ); + stbir__simdf8_bot4s( a0, d0, p0 ); + stbir__simdf8_bot4s( a1, d1, p1 ); + stbir__simdf8_top4s( d0, d0, p0 ); + stbir__simdf8_top4s( d1, d1, p1 ); + stbir__simdf8_store ( out, a0 ); + stbir__simdf8_store ( out+7, d0 ); + stbir__simdf8_store ( out+14, a1 ); + stbir__simdf8_store ( out+21, d1 ); + decode += 16; + out += 28; + } + decode -= 16; + #else + decode += 8; + STBIR_NO_UNROLL_LOOP_START + while ( decode <= end_decode ) + { + stbir__simdf d0,a0,d1,a1,p0,p1; + STBIR_NO_UNROLL(decode); + stbir__simdf_load( d0, decode-8 ); + stbir__simdf_load( d1, decode-8+4 ); + stbir__simdf_0123to3333( a0, d0 ); + stbir__simdf_0123to3333( a1, d1 ); + stbir__simdf_mult( p0, a0, d0 ); + stbir__simdf_mult( p1, a1, d1 ); + stbir__simdf_store ( out, d0 ); + stbir__simdf_store ( out+4, p0 ); + stbir__simdf_store ( out+7, d1 ); + stbir__simdf_store ( out+7+4, p1 ); + decode += 8; + out += 14; + } + decode -= 8; + #endif + + // might be one last odd pixel + #ifdef STBIR_SIMD8 + STBIR_NO_UNROLL_LOOP_START + while ( decode < end_decode ) + #else + if ( decode < end_decode ) + #endif + { + stbir__simdf d,a,p; + STBIR_NO_UNROLL(decode); + stbir__simdf_load( d, decode ); + stbir__simdf_0123to3333( a, d ); + stbir__simdf_mult( p, a, d ); + stbir__simdf_store ( out, d ); + stbir__simdf_store ( out+4, p ); + decode += 4; + out += 7; + } + + #else + + while( decode < end_decode ) + { + float r = decode[0], g = decode[1], b = decode[2], alpha = decode[3]; + out[0] = r; + out[1] = g; + out[2] = b; + out[3] = alpha; + out[4] = r * alpha; + out[5] = g * alpha; + out[6] = b * alpha; + out += 7; + decode += 4; + } + + #endif +} + +static void stbir__fancy_alpha_weight_2ch( float * out_buffer, int width_times_channels ) +{ + float STBIR_STREAMOUT_PTR(*) out = out_buffer; + float const * end_decode = out_buffer + ( width_times_channels / 2 ) * 3; + float STBIR_STREAMOUT_PTR(*) decode = (float*)end_decode - width_times_channels; + + // for fancy alpha, turns into: [X A Xpm][X A Xpm],etc + + #ifdef STBIR_SIMD + + decode += 8; + if ( decode <= end_decode ) + { + STBIR_NO_UNROLL_LOOP_START + do { + #ifdef STBIR_SIMD8 + stbir__simdf8 d0,a0,p0; + STBIR_NO_UNROLL(decode); + stbir__simdf8_load( d0, decode-8 ); + stbir__simdf8_0123to11331133( p0, d0 ); + stbir__simdf8_0123to00220022( a0, d0 ); + stbir__simdf8_mult( p0, p0, a0 ); + + stbir__simdf_store2( out, stbir__if_simdf8_cast_to_simdf4( d0 ) ); + stbir__simdf_store( out+2, stbir__if_simdf8_cast_to_simdf4( p0 ) ); + stbir__simdf_store2h( out+3, stbir__if_simdf8_cast_to_simdf4( d0 ) ); + + stbir__simdf_store2( out+6, stbir__simdf8_gettop4( d0 ) ); + stbir__simdf_store( out+8, stbir__simdf8_gettop4( p0 ) ); + stbir__simdf_store2h( out+9, stbir__simdf8_gettop4( d0 ) ); + #else + stbir__simdf d0,a0,d1,a1,p0,p1; + STBIR_NO_UNROLL(decode); + stbir__simdf_load( d0, decode-8 ); + stbir__simdf_load( d1, decode-8+4 ); + stbir__simdf_0123to1133( p0, d0 ); + stbir__simdf_0123to1133( p1, d1 ); + stbir__simdf_0123to0022( a0, d0 ); + stbir__simdf_0123to0022( a1, d1 ); + stbir__simdf_mult( p0, p0, a0 ); + stbir__simdf_mult( p1, p1, a1 ); + + stbir__simdf_store2( out, d0 ); + stbir__simdf_store( out+2, p0 ); + stbir__simdf_store2h( out+3, d0 ); + + stbir__simdf_store2( out+6, d1 ); + stbir__simdf_store( out+8, p1 ); + stbir__simdf_store2h( out+9, d1 ); + #endif + decode += 8; + out += 12; + } while ( decode <= end_decode ); + } + decode -= 8; + #endif + + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode < end_decode ) + { + float x = decode[0], y = decode[1]; + STBIR_SIMD_NO_UNROLL(decode); + out[0] = x; + out[1] = y; + out[2] = x * y; + out += 3; + decode += 2; + } +} + +static void stbir__fancy_alpha_unweight_4ch( float * encode_buffer, int width_times_channels ) +{ + float STBIR_SIMD_STREAMOUT_PTR(*) encode = encode_buffer; + float STBIR_SIMD_STREAMOUT_PTR(*) input = encode_buffer; + float const * end_output = encode_buffer + width_times_channels; + + // fancy RGBA is stored internally as R G B A Rpm Gpm Bpm + + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float alpha = input[3]; +#ifdef STBIR_SIMD + stbir__simdf i,ia; + STBIR_SIMD_NO_UNROLL(encode); + if ( alpha < stbir__small_float ) + { + stbir__simdf_load( i, input ); + stbir__simdf_store( encode, i ); + } + else + { + stbir__simdf_load1frep4( ia, 1.0f / alpha ); + stbir__simdf_load( i, input+4 ); + stbir__simdf_mult( i, i, ia ); + stbir__simdf_store( encode, i ); + encode[3] = alpha; + } +#else + if ( alpha < stbir__small_float ) + { + encode[0] = input[0]; + encode[1] = input[1]; + encode[2] = input[2]; + } + else + { + float ialpha = 1.0f / alpha; + encode[0] = input[4] * ialpha; + encode[1] = input[5] * ialpha; + encode[2] = input[6] * ialpha; + } + encode[3] = alpha; +#endif + + input += 7; + encode += 4; + } while ( encode < end_output ); +} + +// format: [X A Xpm][X A Xpm] etc +static void stbir__fancy_alpha_unweight_2ch( float * encode_buffer, int width_times_channels ) +{ + float STBIR_SIMD_STREAMOUT_PTR(*) encode = encode_buffer; + float STBIR_SIMD_STREAMOUT_PTR(*) input = encode_buffer; + float const * end_output = encode_buffer + width_times_channels; + + do { + float alpha = input[1]; + encode[0] = input[0]; + if ( alpha >= stbir__small_float ) + encode[0] = input[2] / alpha; + encode[1] = alpha; + + input += 3; + encode += 2; + } while ( encode < end_output ); +} + +static void stbir__simple_alpha_weight_4ch( float * decode_buffer, int width_times_channels ) +{ + float STBIR_STREAMOUT_PTR(*) decode = decode_buffer; + float const * end_decode = decode_buffer + width_times_channels; + + #ifdef STBIR_SIMD + { + decode += 2 * stbir__simdfX_float_count; + STBIR_NO_UNROLL_LOOP_START + while ( decode <= end_decode ) + { + stbir__simdfX d0,a0,d1,a1; + STBIR_NO_UNROLL(decode); + stbir__simdfX_load( d0, decode-2*stbir__simdfX_float_count ); + stbir__simdfX_load( d1, decode-2*stbir__simdfX_float_count+stbir__simdfX_float_count ); + stbir__simdfX_aaa1( a0, d0, STBIR_onesX ); + stbir__simdfX_aaa1( a1, d1, STBIR_onesX ); + stbir__simdfX_mult( d0, d0, a0 ); + stbir__simdfX_mult( d1, d1, a1 ); + stbir__simdfX_store ( decode-2*stbir__simdfX_float_count, d0 ); + stbir__simdfX_store ( decode-2*stbir__simdfX_float_count+stbir__simdfX_float_count, d1 ); + decode += 2 * stbir__simdfX_float_count; + } + decode -= 2 * stbir__simdfX_float_count; + + // few last pixels remnants + #ifdef STBIR_SIMD8 + STBIR_NO_UNROLL_LOOP_START + while ( decode < end_decode ) + #else + if ( decode < end_decode ) + #endif + { + stbir__simdf d,a; + stbir__simdf_load( d, decode ); + stbir__simdf_aaa1( a, d, STBIR__CONSTF(STBIR_ones) ); + stbir__simdf_mult( d, d, a ); + stbir__simdf_store ( decode, d ); + decode += 4; + } + } + + #else + + while( decode < end_decode ) + { + float alpha = decode[3]; + decode[0] *= alpha; + decode[1] *= alpha; + decode[2] *= alpha; + decode += 4; + } + + #endif +} + +static void stbir__simple_alpha_weight_2ch( float * decode_buffer, int width_times_channels ) +{ + float STBIR_STREAMOUT_PTR(*) decode = decode_buffer; + float const * end_decode = decode_buffer + width_times_channels; + + #ifdef STBIR_SIMD + decode += 2 * stbir__simdfX_float_count; + STBIR_NO_UNROLL_LOOP_START + while ( decode <= end_decode ) + { + stbir__simdfX d0,a0,d1,a1; + STBIR_NO_UNROLL(decode); + stbir__simdfX_load( d0, decode-2*stbir__simdfX_float_count ); + stbir__simdfX_load( d1, decode-2*stbir__simdfX_float_count+stbir__simdfX_float_count ); + stbir__simdfX_a1a1( a0, d0, STBIR_onesX ); + stbir__simdfX_a1a1( a1, d1, STBIR_onesX ); + stbir__simdfX_mult( d0, d0, a0 ); + stbir__simdfX_mult( d1, d1, a1 ); + stbir__simdfX_store ( decode-2*stbir__simdfX_float_count, d0 ); + stbir__simdfX_store ( decode-2*stbir__simdfX_float_count+stbir__simdfX_float_count, d1 ); + decode += 2 * stbir__simdfX_float_count; + } + decode -= 2 * stbir__simdfX_float_count; + #endif + + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode < end_decode ) + { + float alpha = decode[1]; + STBIR_SIMD_NO_UNROLL(decode); + decode[0] *= alpha; + decode += 2; + } +} + +static void stbir__simple_alpha_unweight_4ch( float * encode_buffer, int width_times_channels ) +{ + float STBIR_SIMD_STREAMOUT_PTR(*) encode = encode_buffer; + float const * end_output = encode_buffer + width_times_channels; + + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float alpha = encode[3]; + +#ifdef STBIR_SIMD + stbir__simdf i,ia; + STBIR_SIMD_NO_UNROLL(encode); + if ( alpha >= stbir__small_float ) + { + stbir__simdf_load1frep4( ia, 1.0f / alpha ); + stbir__simdf_load( i, encode ); + stbir__simdf_mult( i, i, ia ); + stbir__simdf_store( encode, i ); + encode[3] = alpha; + } +#else + if ( alpha >= stbir__small_float ) + { + float ialpha = 1.0f / alpha; + encode[0] *= ialpha; + encode[1] *= ialpha; + encode[2] *= ialpha; + } +#endif + encode += 4; + } while ( encode < end_output ); +} + +static void stbir__simple_alpha_unweight_2ch( float * encode_buffer, int width_times_channels ) +{ + float STBIR_SIMD_STREAMOUT_PTR(*) encode = encode_buffer; + float const * end_output = encode_buffer + width_times_channels; + + do { + float alpha = encode[1]; + if ( alpha >= stbir__small_float ) + encode[0] /= alpha; + encode += 2; + } while ( encode < end_output ); +} + + +// only used in RGB->BGR or BGR->RGB +static void stbir__simple_flip_3ch( float * decode_buffer, int width_times_channels ) +{ + float STBIR_STREAMOUT_PTR(*) decode = decode_buffer; + float const * end_decode = decode_buffer + width_times_channels; + +#ifdef STBIR_SIMD + #ifdef stbir__simdf_swiz2 // do we have two argument swizzles? + end_decode -= 12; + STBIR_NO_UNROLL_LOOP_START + while( decode <= end_decode ) + { + // on arm64 8 instructions, no overlapping stores + stbir__simdf a,b,c,na,nb; + STBIR_SIMD_NO_UNROLL(decode); + stbir__simdf_load( a, decode ); + stbir__simdf_load( b, decode+4 ); + stbir__simdf_load( c, decode+8 ); + + na = stbir__simdf_swiz2( a, b, 2, 1, 0, 5 ); + b = stbir__simdf_swiz2( a, b, 4, 3, 6, 7 ); + nb = stbir__simdf_swiz2( b, c, 0, 1, 4, 3 ); + c = stbir__simdf_swiz2( b, c, 2, 7, 6, 5 ); + + stbir__simdf_store( decode, na ); + stbir__simdf_store( decode+4, nb ); + stbir__simdf_store( decode+8, c ); + decode += 12; + } + end_decode += 12; + #else + end_decode -= 24; + STBIR_NO_UNROLL_LOOP_START + while( decode <= end_decode ) + { + // 26 instructions on x64 + stbir__simdf a,b,c,d,e,f,g; + float i21, i23; + STBIR_SIMD_NO_UNROLL(decode); + stbir__simdf_load( a, decode ); + stbir__simdf_load( b, decode+3 ); + stbir__simdf_load( c, decode+6 ); + stbir__simdf_load( d, decode+9 ); + stbir__simdf_load( e, decode+12 ); + stbir__simdf_load( f, decode+15 ); + stbir__simdf_load( g, decode+18 ); + + a = stbir__simdf_swiz( a, 2, 1, 0, 3 ); + b = stbir__simdf_swiz( b, 2, 1, 0, 3 ); + c = stbir__simdf_swiz( c, 2, 1, 0, 3 ); + d = stbir__simdf_swiz( d, 2, 1, 0, 3 ); + e = stbir__simdf_swiz( e, 2, 1, 0, 3 ); + f = stbir__simdf_swiz( f, 2, 1, 0, 3 ); + g = stbir__simdf_swiz( g, 2, 1, 0, 3 ); + + // stores overlap, need to be in order, + stbir__simdf_store( decode, a ); + i21 = decode[21]; + stbir__simdf_store( decode+3, b ); + i23 = decode[23]; + stbir__simdf_store( decode+6, c ); + stbir__simdf_store( decode+9, d ); + stbir__simdf_store( decode+12, e ); + stbir__simdf_store( decode+15, f ); + stbir__simdf_store( decode+18, g ); + decode[21] = i23; + decode[23] = i21; + decode += 24; + } + end_decode += 24; + #endif +#else + end_decode -= 12; + STBIR_NO_UNROLL_LOOP_START + while( decode <= end_decode ) + { + // 16 instructions + float t0,t1,t2,t3; + STBIR_NO_UNROLL(decode); + t0 = decode[0]; t1 = decode[3]; t2 = decode[6]; t3 = decode[9]; + decode[0] = decode[2]; decode[3] = decode[5]; decode[6] = decode[8]; decode[9] = decode[11]; + decode[2] = t0; decode[5] = t1; decode[8] = t2; decode[11] = t3; + decode += 12; + } + end_decode += 12; +#endif + + STBIR_NO_UNROLL_LOOP_START + while( decode < end_decode ) + { + float t = decode[0]; + STBIR_NO_UNROLL(decode); + decode[0] = decode[2]; + decode[2] = t; + decode += 3; + } +} + + + +static void stbir__decode_scanline(stbir__info const * stbir_info, int n, float * output_buffer STBIR_ONLY_PROFILE_GET_SPLIT_INFO ) +{ + int channels = stbir_info->channels; + int effective_channels = stbir_info->effective_channels; + int input_sample_in_bytes = stbir__type_size[stbir_info->input_type] * channels; + stbir_edge edge_horizontal = stbir_info->horizontal.edge; + stbir_edge edge_vertical = stbir_info->vertical.edge; + int row = stbir__edge_wrap(edge_vertical, n, stbir_info->vertical.scale_info.input_full_size); + const void* input_plane_data = ( (char *) stbir_info->input_data ) + (size_t)row * (size_t) stbir_info->input_stride_bytes; + stbir__span const * spans = stbir_info->scanline_extents.spans; + float* full_decode_buffer = output_buffer - stbir_info->scanline_extents.conservative.n0 * effective_channels; + + // if we are on edge_zero, and we get in here with an out of bounds n, then the calculate filters has failed + STBIR_ASSERT( !(edge_vertical == STBIR_EDGE_ZERO && (n < 0 || n >= stbir_info->vertical.scale_info.input_full_size)) ); + + do + { + float * decode_buffer; + void const * input_data; + float * end_decode; + int width_times_channels; + int width; + + if ( spans->n1 < spans->n0 ) + break; + + width = spans->n1 + 1 - spans->n0; + decode_buffer = full_decode_buffer + spans->n0 * effective_channels; + end_decode = full_decode_buffer + ( spans->n1 + 1 ) * effective_channels; + width_times_channels = width * channels; + + // read directly out of input plane by default + input_data = ( (char*)input_plane_data ) + spans->pixel_offset_for_input * input_sample_in_bytes; + + // if we have an input callback, call it to get the input data + if ( stbir_info->in_pixels_cb ) + { + // call the callback with a temp buffer (that they can choose to use or not). the temp is just right aligned memory in the decode_buffer itself + input_data = stbir_info->in_pixels_cb( ( (char*) end_decode ) - ( width * input_sample_in_bytes ), input_plane_data, width, spans->pixel_offset_for_input, row, stbir_info->user_data ); + } + + STBIR_PROFILE_START( decode ); + // convert the pixels info the float decode_buffer, (we index from end_decode, so that when channels<effective_channels, we are right justified in the buffer) + stbir_info->decode_pixels( (float*)end_decode - width_times_channels, width_times_channels, input_data ); + STBIR_PROFILE_END( decode ); + + if (stbir_info->alpha_weight) + { + STBIR_PROFILE_START( alpha ); + stbir_info->alpha_weight( decode_buffer, width_times_channels ); + STBIR_PROFILE_END( alpha ); + } + + ++spans; + } while ( spans <= ( &stbir_info->scanline_extents.spans[1] ) ); + + // handle the edge_wrap filter (all other types are handled back out at the calculate_filter stage) + // basically the idea here is that if we have the whole scanline in memory, we don't redecode the + // wrapped edge pixels, and instead just memcpy them from the scanline into the edge positions + if ( ( edge_horizontal == STBIR_EDGE_WRAP ) && ( stbir_info->scanline_extents.edge_sizes[0] | stbir_info->scanline_extents.edge_sizes[1] ) ) + { + // this code only runs if we're in edge_wrap, and we're doing the entire scanline + int e, start_x[2]; + int input_full_size = stbir_info->horizontal.scale_info.input_full_size; + + start_x[0] = -stbir_info->scanline_extents.edge_sizes[0]; // left edge start x + start_x[1] = input_full_size; // right edge + + for( e = 0; e < 2 ; e++ ) + { + // do each margin + int margin = stbir_info->scanline_extents.edge_sizes[e]; + if ( margin ) + { + int x = start_x[e]; + float * marg = full_decode_buffer + x * effective_channels; + float const * src = full_decode_buffer + stbir__edge_wrap(edge_horizontal, x, input_full_size) * effective_channels; + STBIR_MEMCPY( marg, src, margin * effective_channels * sizeof(float) ); + } + } + } +} + + +//================= +// Do 1 channel horizontal routines + +#ifdef STBIR_SIMD + +#define stbir__1_coeff_only() \ + stbir__simdf tot,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1( c, hc ); \ + stbir__simdf_mult1_mem( tot, c, decode ); + +#define stbir__2_coeff_only() \ + stbir__simdf tot,c,d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2z( c, hc ); \ + stbir__simdf_load2( d, decode ); \ + stbir__simdf_mult( tot, c, d ); \ + stbir__simdf_0123to1230( c, tot ); \ + stbir__simdf_add1( tot, tot, c ); + +#define stbir__3_coeff_only() \ + stbir__simdf tot,c,t; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( c, hc ); \ + stbir__simdf_mult_mem( tot, c, decode ); \ + stbir__simdf_0123to1230( c, tot ); \ + stbir__simdf_0123to2301( t, tot ); \ + stbir__simdf_add1( tot, tot, c ); \ + stbir__simdf_add1( tot, tot, t ); + +#define stbir__store_output_tiny() \ + stbir__simdf_store1( output, tot ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 1; + +#define stbir__4_coeff_start() \ + stbir__simdf tot,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( c, hc ); \ + stbir__simdf_mult_mem( tot, c, decode ); \ + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( c, hc + (ofs) ); \ + stbir__simdf_madd_mem( tot, tot, c, decode+(ofs) ); + +#define stbir__1_coeff_remnant( ofs ) \ + { stbir__simdf d; \ + stbir__simdf_load1z( c, hc + (ofs) ); \ + stbir__simdf_load1( d, decode + (ofs) ); \ + stbir__simdf_madd( tot, tot, d, c ); } + +#define stbir__2_coeff_remnant( ofs ) \ + { stbir__simdf d; \ + stbir__simdf_load2z( c, hc+(ofs) ); \ + stbir__simdf_load2( d, decode+(ofs) ); \ + stbir__simdf_madd( tot, tot, d, c ); } + +#define stbir__3_coeff_setup() \ + stbir__simdf mask; \ + stbir__simdf_load( mask, STBIR_mask + 3 ); + +#define stbir__3_coeff_remnant( ofs ) \ + stbir__simdf_load( c, hc+(ofs) ); \ + stbir__simdf_and( c, c, mask ); \ + stbir__simdf_madd_mem( tot, tot, c, decode+(ofs) ); + +#define stbir__store_output() \ + stbir__simdf_0123to2301( c, tot ); \ + stbir__simdf_add( tot, tot, c ); \ + stbir__simdf_0123to1230( c, tot ); \ + stbir__simdf_add1( tot, tot, c ); \ + stbir__simdf_store1( output, tot ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 1; + +#else + +#define stbir__1_coeff_only() \ + float tot; \ + tot = decode[0]*hc[0]; + +#define stbir__2_coeff_only() \ + float tot; \ + tot = decode[0] * hc[0]; \ + tot += decode[1] * hc[1]; + +#define stbir__3_coeff_only() \ + float tot; \ + tot = decode[0] * hc[0]; \ + tot += decode[1] * hc[1]; \ + tot += decode[2] * hc[2]; + +#define stbir__store_output_tiny() \ + output[0] = tot; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 1; + +#define stbir__4_coeff_start() \ + float tot0,tot1,tot2,tot3; \ + tot0 = decode[0] * hc[0]; \ + tot1 = decode[1] * hc[1]; \ + tot2 = decode[2] * hc[2]; \ + tot3 = decode[3] * hc[3]; + +#define stbir__4_coeff_continue_from_4( ofs ) \ + tot0 += decode[0+(ofs)] * hc[0+(ofs)]; \ + tot1 += decode[1+(ofs)] * hc[1+(ofs)]; \ + tot2 += decode[2+(ofs)] * hc[2+(ofs)]; \ + tot3 += decode[3+(ofs)] * hc[3+(ofs)]; + +#define stbir__1_coeff_remnant( ofs ) \ + tot0 += decode[0+(ofs)] * hc[0+(ofs)]; + +#define stbir__2_coeff_remnant( ofs ) \ + tot0 += decode[0+(ofs)] * hc[0+(ofs)]; \ + tot1 += decode[1+(ofs)] * hc[1+(ofs)]; \ + +#define stbir__3_coeff_remnant( ofs ) \ + tot0 += decode[0+(ofs)] * hc[0+(ofs)]; \ + tot1 += decode[1+(ofs)] * hc[1+(ofs)]; \ + tot2 += decode[2+(ofs)] * hc[2+(ofs)]; + +#define stbir__store_output() \ + output[0] = (tot0+tot2)+(tot1+tot3); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 1; + +#endif + +#define STBIR__horizontal_channels 1 +#define STB_IMAGE_RESIZE_DO_HORIZONTALS +#include STBIR__HEADER_FILENAME + + +//================= +// Do 2 channel horizontal routines + +#ifdef STBIR_SIMD + +#define stbir__1_coeff_only() \ + stbir__simdf tot,c,d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1z( c, hc ); \ + stbir__simdf_0123to0011( c, c ); \ + stbir__simdf_load2( d, decode ); \ + stbir__simdf_mult( tot, d, c ); + +#define stbir__2_coeff_only() \ + stbir__simdf tot,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2( c, hc ); \ + stbir__simdf_0123to0011( c, c ); \ + stbir__simdf_mult_mem( tot, c, decode ); + +#define stbir__3_coeff_only() \ + stbir__simdf tot,c,cs,d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0011( c, cs ); \ + stbir__simdf_mult_mem( tot, c, decode ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_load2z( d, decode+4 ); \ + stbir__simdf_madd( tot, tot, d, c ); + +#define stbir__store_output_tiny() \ + stbir__simdf_0123to2301( c, tot ); \ + stbir__simdf_add( tot, tot, c ); \ + stbir__simdf_store2( output, tot ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 2; + +#ifdef STBIR_SIMD8 + +#define stbir__4_coeff_start() \ + stbir__simdf8 tot0,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc ); \ + stbir__simdf8_0123to00112233( c, cs ); \ + stbir__simdf8_mult_mem( tot0, c, decode ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00112233( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*2 ); + +#define stbir__1_coeff_remnant( ofs ) \ + { stbir__simdf t,d; \ + stbir__simdf_load1z( t, hc + (ofs) ); \ + stbir__simdf_load2( d, decode + (ofs) * 2 ); \ + stbir__simdf_0123to0011( t, t ); \ + stbir__simdf_mult( t, t, d ); \ + stbir__simdf8_add4( tot0, tot0, t ); } + +#define stbir__2_coeff_remnant( ofs ) \ + { stbir__simdf t; \ + stbir__simdf_load2( t, hc + (ofs) ); \ + stbir__simdf_0123to0011( t, t ); \ + stbir__simdf_mult_mem( t, t, decode+(ofs)*2 ); \ + stbir__simdf8_add4( tot0, tot0, t ); } + +#define stbir__3_coeff_remnant( ofs ) \ + { stbir__simdf8 d; \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00112233( c, cs ); \ + stbir__simdf8_load6z( d, decode+(ofs)*2 ); \ + stbir__simdf8_madd( tot0, tot0, c, d ); } + +#define stbir__store_output() \ + { stbir__simdf t,d; \ + stbir__simdf8_add4halves( t, stbir__if_simdf8_cast_to_simdf4(tot0), tot0 ); \ + stbir__simdf_0123to2301( d, t ); \ + stbir__simdf_add( t, t, d ); \ + stbir__simdf_store2( output, t ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 2; } + +#else + +#define stbir__4_coeff_start() \ + stbir__simdf tot0,tot1,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0011( c, cs ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_0123to2233( c, cs ); \ + stbir__simdf_mult_mem( tot1, c, decode+4 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0011( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*2 ); \ + stbir__simdf_0123to2233( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*2+4 ); + +#define stbir__1_coeff_remnant( ofs ) \ + { stbir__simdf d; \ + stbir__simdf_load1z( cs, hc + (ofs) ); \ + stbir__simdf_0123to0011( c, cs ); \ + stbir__simdf_load2( d, decode + (ofs) * 2 ); \ + stbir__simdf_madd( tot0, tot0, d, c ); } + +#define stbir__2_coeff_remnant( ofs ) \ + stbir__simdf_load2( cs, hc + (ofs) ); \ + stbir__simdf_0123to0011( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*2 ); + +#define stbir__3_coeff_remnant( ofs ) \ + { stbir__simdf d; \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0011( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*2 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_load2z( d, decode + (ofs) * 2 + 4 ); \ + stbir__simdf_madd( tot1, tot1, d, c ); } + +#define stbir__store_output() \ + stbir__simdf_add( tot0, tot0, tot1 ); \ + stbir__simdf_0123to2301( c, tot0 ); \ + stbir__simdf_add( tot0, tot0, c ); \ + stbir__simdf_store2( output, tot0 ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 2; + +#endif + +#else + +#define stbir__1_coeff_only() \ + float tota,totb,c; \ + c = hc[0]; \ + tota = decode[0]*c; \ + totb = decode[1]*c; + +#define stbir__2_coeff_only() \ + float tota,totb,c; \ + c = hc[0]; \ + tota = decode[0]*c; \ + totb = decode[1]*c; \ + c = hc[1]; \ + tota += decode[2]*c; \ + totb += decode[3]*c; + +// this weird order of add matches the simd +#define stbir__3_coeff_only() \ + float tota,totb,c; \ + c = hc[0]; \ + tota = decode[0]*c; \ + totb = decode[1]*c; \ + c = hc[2]; \ + tota += decode[4]*c; \ + totb += decode[5]*c; \ + c = hc[1]; \ + tota += decode[2]*c; \ + totb += decode[3]*c; + +#define stbir__store_output_tiny() \ + output[0] = tota; \ + output[1] = totb; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 2; + +#define stbir__4_coeff_start() \ + float tota0,tota1,tota2,tota3,totb0,totb1,totb2,totb3,c; \ + c = hc[0]; \ + tota0 = decode[0]*c; \ + totb0 = decode[1]*c; \ + c = hc[1]; \ + tota1 = decode[2]*c; \ + totb1 = decode[3]*c; \ + c = hc[2]; \ + tota2 = decode[4]*c; \ + totb2 = decode[5]*c; \ + c = hc[3]; \ + tota3 = decode[6]*c; \ + totb3 = decode[7]*c; + +#define stbir__4_coeff_continue_from_4( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*2]*c; \ + totb0 += decode[1+(ofs)*2]*c; \ + c = hc[1+(ofs)]; \ + tota1 += decode[2+(ofs)*2]*c; \ + totb1 += decode[3+(ofs)*2]*c; \ + c = hc[2+(ofs)]; \ + tota2 += decode[4+(ofs)*2]*c; \ + totb2 += decode[5+(ofs)*2]*c; \ + c = hc[3+(ofs)]; \ + tota3 += decode[6+(ofs)*2]*c; \ + totb3 += decode[7+(ofs)*2]*c; + +#define stbir__1_coeff_remnant( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*2] * c; \ + totb0 += decode[1+(ofs)*2] * c; + +#define stbir__2_coeff_remnant( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*2] * c; \ + totb0 += decode[1+(ofs)*2] * c; \ + c = hc[1+(ofs)]; \ + tota1 += decode[2+(ofs)*2] * c; \ + totb1 += decode[3+(ofs)*2] * c; + +#define stbir__3_coeff_remnant( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*2] * c; \ + totb0 += decode[1+(ofs)*2] * c; \ + c = hc[1+(ofs)]; \ + tota1 += decode[2+(ofs)*2] * c; \ + totb1 += decode[3+(ofs)*2] * c; \ + c = hc[2+(ofs)]; \ + tota2 += decode[4+(ofs)*2] * c; \ + totb2 += decode[5+(ofs)*2] * c; + +#define stbir__store_output() \ + output[0] = (tota0+tota2)+(tota1+tota3); \ + output[1] = (totb0+totb2)+(totb1+totb3); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 2; + +#endif + +#define STBIR__horizontal_channels 2 +#define STB_IMAGE_RESIZE_DO_HORIZONTALS +#include STBIR__HEADER_FILENAME + + +//================= +// Do 3 channel horizontal routines + +#ifdef STBIR_SIMD + +#define stbir__1_coeff_only() \ + stbir__simdf tot,c,d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1z( c, hc ); \ + stbir__simdf_0123to0001( c, c ); \ + stbir__simdf_load( d, decode ); \ + stbir__simdf_mult( tot, d, c ); + +#define stbir__2_coeff_only() \ + stbir__simdf tot,c,cs,d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_load( d, decode ); \ + stbir__simdf_mult( tot, d, c ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_load( d, decode+3 ); \ + stbir__simdf_madd( tot, tot, d, c ); + +#define stbir__3_coeff_only() \ + stbir__simdf tot,c,d,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_load( d, decode ); \ + stbir__simdf_mult( tot, d, c ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_load( d, decode+3 ); \ + stbir__simdf_madd( tot, tot, d, c ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_load( d, decode+6 ); \ + stbir__simdf_madd( tot, tot, d, c ); + +#define stbir__store_output_tiny() \ + stbir__simdf_store2( output, tot ); \ + stbir__simdf_0123to2301( tot, tot ); \ + stbir__simdf_store1( output+2, tot ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 3; + +#ifdef STBIR_SIMD8 + +// we're loading from the XXXYYY decode by -1 to get the XXXYYY into different halves of the AVX reg fyi +#define stbir__4_coeff_start() \ + stbir__simdf8 tot0,tot1,c,cs; stbir__simdf t; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc ); \ + stbir__simdf8_0123to00001111( c, cs ); \ + stbir__simdf8_mult_mem( tot0, c, decode - 1 ); \ + stbir__simdf8_0123to22223333( c, cs ); \ + stbir__simdf8_mult_mem( tot1, c, decode+6 - 1 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00001111( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*3 - 1 ); \ + stbir__simdf8_0123to22223333( c, cs ); \ + stbir__simdf8_madd_mem( tot1, tot1, c, decode+(ofs)*3 + 6 - 1 ); + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1rep4( t, hc + (ofs) ); \ + stbir__simdf8_madd_mem4( tot0, tot0, t, decode+(ofs)*3 - 1 ); + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) - 2 ); \ + stbir__simdf8_0123to22223333( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*3 - 1 ); + + #define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00001111( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*3 - 1 ); \ + stbir__simdf8_0123to2222( t, cs ); \ + stbir__simdf8_madd_mem4( tot1, tot1, t, decode+(ofs)*3 + 6 - 1 ); + +#define stbir__store_output() \ + stbir__simdf8_add( tot0, tot0, tot1 ); \ + stbir__simdf_0123to1230( t, stbir__if_simdf8_cast_to_simdf4( tot0 ) ); \ + stbir__simdf8_add4halves( t, t, tot0 ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 3; \ + if ( output < output_end ) \ + { \ + stbir__simdf_store( output-3, t ); \ + continue; \ + } \ + { stbir__simdf tt; stbir__simdf_0123to2301( tt, t ); \ + stbir__simdf_store2( output-3, t ); \ + stbir__simdf_store1( output+2-3, tt ); } \ + break; + + +#else + +#define stbir__4_coeff_start() \ + stbir__simdf tot0,tot1,tot2,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0001( c, cs ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_0123to1122( c, cs ); \ + stbir__simdf_mult_mem( tot1, c, decode+4 ); \ + stbir__simdf_0123to2333( c, cs ); \ + stbir__simdf_mult_mem( tot2, c, decode+8 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0001( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*3 ); \ + stbir__simdf_0123to1122( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*3+4 ); \ + stbir__simdf_0123to2333( c, cs ); \ + stbir__simdf_madd_mem( tot2, tot2, c, decode+(ofs)*3+8 ); + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1z( c, hc + (ofs) ); \ + stbir__simdf_0123to0001( c, c ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*3 ); + +#define stbir__2_coeff_remnant( ofs ) \ + { stbir__simdf d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2z( cs, hc + (ofs) ); \ + stbir__simdf_0123to0001( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*3 ); \ + stbir__simdf_0123to1122( c, cs ); \ + stbir__simdf_load2z( d, decode+(ofs)*3+4 ); \ + stbir__simdf_madd( tot1, tot1, c, d ); } + +#define stbir__3_coeff_remnant( ofs ) \ + { stbir__simdf d; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0001( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*3 ); \ + stbir__simdf_0123to1122( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*3+4 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_load1z( d, decode+(ofs)*3+8 ); \ + stbir__simdf_madd( tot2, tot2, c, d ); } + +#define stbir__store_output() \ + stbir__simdf_0123ABCDto3ABx( c, tot0, tot1 ); \ + stbir__simdf_0123ABCDto23Ax( cs, tot1, tot2 ); \ + stbir__simdf_0123to1230( tot2, tot2 ); \ + stbir__simdf_add( tot0, tot0, cs ); \ + stbir__simdf_add( c, c, tot2 ); \ + stbir__simdf_add( tot0, tot0, c ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 3; \ + if ( output < output_end ) \ + { \ + stbir__simdf_store( output-3, tot0 ); \ + continue; \ + } \ + stbir__simdf_0123to2301( tot1, tot0 ); \ + stbir__simdf_store2( output-3, tot0 ); \ + stbir__simdf_store1( output+2-3, tot1 ); \ + break; + +#endif + +#else + +#define stbir__1_coeff_only() \ + float tot0, tot1, tot2, c; \ + c = hc[0]; \ + tot0 = decode[0]*c; \ + tot1 = decode[1]*c; \ + tot2 = decode[2]*c; + +#define stbir__2_coeff_only() \ + float tot0, tot1, tot2, c; \ + c = hc[0]; \ + tot0 = decode[0]*c; \ + tot1 = decode[1]*c; \ + tot2 = decode[2]*c; \ + c = hc[1]; \ + tot0 += decode[3]*c; \ + tot1 += decode[4]*c; \ + tot2 += decode[5]*c; + +#define stbir__3_coeff_only() \ + float tot0, tot1, tot2, c; \ + c = hc[0]; \ + tot0 = decode[0]*c; \ + tot1 = decode[1]*c; \ + tot2 = decode[2]*c; \ + c = hc[1]; \ + tot0 += decode[3]*c; \ + tot1 += decode[4]*c; \ + tot2 += decode[5]*c; \ + c = hc[2]; \ + tot0 += decode[6]*c; \ + tot1 += decode[7]*c; \ + tot2 += decode[8]*c; + +#define stbir__store_output_tiny() \ + output[0] = tot0; \ + output[1] = tot1; \ + output[2] = tot2; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 3; + +#define stbir__4_coeff_start() \ + float tota0,tota1,tota2,totb0,totb1,totb2,totc0,totc1,totc2,totd0,totd1,totd2,c; \ + c = hc[0]; \ + tota0 = decode[0]*c; \ + tota1 = decode[1]*c; \ + tota2 = decode[2]*c; \ + c = hc[1]; \ + totb0 = decode[3]*c; \ + totb1 = decode[4]*c; \ + totb2 = decode[5]*c; \ + c = hc[2]; \ + totc0 = decode[6]*c; \ + totc1 = decode[7]*c; \ + totc2 = decode[8]*c; \ + c = hc[3]; \ + totd0 = decode[9]*c; \ + totd1 = decode[10]*c; \ + totd2 = decode[11]*c; + +#define stbir__4_coeff_continue_from_4( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*3]*c; \ + tota1 += decode[1+(ofs)*3]*c; \ + tota2 += decode[2+(ofs)*3]*c; \ + c = hc[1+(ofs)]; \ + totb0 += decode[3+(ofs)*3]*c; \ + totb1 += decode[4+(ofs)*3]*c; \ + totb2 += decode[5+(ofs)*3]*c; \ + c = hc[2+(ofs)]; \ + totc0 += decode[6+(ofs)*3]*c; \ + totc1 += decode[7+(ofs)*3]*c; \ + totc2 += decode[8+(ofs)*3]*c; \ + c = hc[3+(ofs)]; \ + totd0 += decode[9+(ofs)*3]*c; \ + totd1 += decode[10+(ofs)*3]*c; \ + totd2 += decode[11+(ofs)*3]*c; + +#define stbir__1_coeff_remnant( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*3]*c; \ + tota1 += decode[1+(ofs)*3]*c; \ + tota2 += decode[2+(ofs)*3]*c; + +#define stbir__2_coeff_remnant( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*3]*c; \ + tota1 += decode[1+(ofs)*3]*c; \ + tota2 += decode[2+(ofs)*3]*c; \ + c = hc[1+(ofs)]; \ + totb0 += decode[3+(ofs)*3]*c; \ + totb1 += decode[4+(ofs)*3]*c; \ + totb2 += decode[5+(ofs)*3]*c; \ + +#define stbir__3_coeff_remnant( ofs ) \ + c = hc[0+(ofs)]; \ + tota0 += decode[0+(ofs)*3]*c; \ + tota1 += decode[1+(ofs)*3]*c; \ + tota2 += decode[2+(ofs)*3]*c; \ + c = hc[1+(ofs)]; \ + totb0 += decode[3+(ofs)*3]*c; \ + totb1 += decode[4+(ofs)*3]*c; \ + totb2 += decode[5+(ofs)*3]*c; \ + c = hc[2+(ofs)]; \ + totc0 += decode[6+(ofs)*3]*c; \ + totc1 += decode[7+(ofs)*3]*c; \ + totc2 += decode[8+(ofs)*3]*c; + +#define stbir__store_output() \ + output[0] = (tota0+totc0)+(totb0+totd0); \ + output[1] = (tota1+totc1)+(totb1+totd1); \ + output[2] = (tota2+totc2)+(totb2+totd2); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 3; + +#endif + +#define STBIR__horizontal_channels 3 +#define STB_IMAGE_RESIZE_DO_HORIZONTALS +#include STBIR__HEADER_FILENAME + +//================= +// Do 4 channel horizontal routines + +#ifdef STBIR_SIMD + +#define stbir__1_coeff_only() \ + stbir__simdf tot,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1( c, hc ); \ + stbir__simdf_0123to0000( c, c ); \ + stbir__simdf_mult_mem( tot, c, decode ); + +#define stbir__2_coeff_only() \ + stbir__simdf tot,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_mult_mem( tot, c, decode ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot, tot, c, decode+4 ); + +#define stbir__3_coeff_only() \ + stbir__simdf tot,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_mult_mem( tot, c, decode ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot, tot, c, decode+4 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot, tot, c, decode+8 ); + +#define stbir__store_output_tiny() \ + stbir__simdf_store( output, tot ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 4; + +#ifdef STBIR_SIMD8 + +#define stbir__4_coeff_start() \ + stbir__simdf8 tot0,c,cs; stbir__simdf t; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc ); \ + stbir__simdf8_0123to00001111( c, cs ); \ + stbir__simdf8_mult_mem( tot0, c, decode ); \ + stbir__simdf8_0123to22223333( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+8 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00001111( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); \ + stbir__simdf8_0123to22223333( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*4+8 ); + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1rep4( t, hc + (ofs) ); \ + stbir__simdf8_madd_mem4( tot0, tot0, t, decode+(ofs)*4 ); + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) - 2 ); \ + stbir__simdf8_0123to22223333( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); + + #define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00001111( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); \ + stbir__simdf8_0123to2222( t, cs ); \ + stbir__simdf8_madd_mem4( tot0, tot0, t, decode+(ofs)*4+8 ); + +#define stbir__store_output() \ + stbir__simdf8_add4halves( t, stbir__if_simdf8_cast_to_simdf4(tot0), tot0 ); \ + stbir__simdf_store( output, t ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 4; + +#else + +#define stbir__4_coeff_start() \ + stbir__simdf tot0,tot1,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_mult_mem( tot1, c, decode+4 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+8 ); \ + stbir__simdf_0123to3333( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+12 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*4+4 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*4+8 ); \ + stbir__simdf_0123to3333( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*4+12 ); + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1( c, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, c ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2( cs, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*4+4 ); + +#define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*4 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*4+4 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*4+8 ); + +#define stbir__store_output() \ + stbir__simdf_add( tot0, tot0, tot1 ); \ + stbir__simdf_store( output, tot0 ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 4; + +#endif + +#else + +#define stbir__1_coeff_only() \ + float p0,p1,p2,p3,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0]; \ + p0 = decode[0] * c; \ + p1 = decode[1] * c; \ + p2 = decode[2] * c; \ + p3 = decode[3] * c; + +#define stbir__2_coeff_only() \ + float p0,p1,p2,p3,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0]; \ + p0 = decode[0] * c; \ + p1 = decode[1] * c; \ + p2 = decode[2] * c; \ + p3 = decode[3] * c; \ + c = hc[1]; \ + p0 += decode[4] * c; \ + p1 += decode[5] * c; \ + p2 += decode[6] * c; \ + p3 += decode[7] * c; + +#define stbir__3_coeff_only() \ + float p0,p1,p2,p3,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0]; \ + p0 = decode[0] * c; \ + p1 = decode[1] * c; \ + p2 = decode[2] * c; \ + p3 = decode[3] * c; \ + c = hc[1]; \ + p0 += decode[4] * c; \ + p1 += decode[5] * c; \ + p2 += decode[6] * c; \ + p3 += decode[7] * c; \ + c = hc[2]; \ + p0 += decode[8] * c; \ + p1 += decode[9] * c; \ + p2 += decode[10] * c; \ + p3 += decode[11] * c; + +#define stbir__store_output_tiny() \ + output[0] = p0; \ + output[1] = p1; \ + output[2] = p2; \ + output[3] = p3; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 4; + +#define stbir__4_coeff_start() \ + float x0,x1,x2,x3,y0,y1,y2,y3,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0]; \ + x0 = decode[0] * c; \ + x1 = decode[1] * c; \ + x2 = decode[2] * c; \ + x3 = decode[3] * c; \ + c = hc[1]; \ + y0 = decode[4] * c; \ + y1 = decode[5] * c; \ + y2 = decode[6] * c; \ + y3 = decode[7] * c; \ + c = hc[2]; \ + x0 += decode[8] * c; \ + x1 += decode[9] * c; \ + x2 += decode[10] * c; \ + x3 += decode[11] * c; \ + c = hc[3]; \ + y0 += decode[12] * c; \ + y1 += decode[13] * c; \ + y2 += decode[14] * c; \ + y3 += decode[15] * c; + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*4] * c; \ + x1 += decode[1+(ofs)*4] * c; \ + x2 += decode[2+(ofs)*4] * c; \ + x3 += decode[3+(ofs)*4] * c; \ + c = hc[1+(ofs)]; \ + y0 += decode[4+(ofs)*4] * c; \ + y1 += decode[5+(ofs)*4] * c; \ + y2 += decode[6+(ofs)*4] * c; \ + y3 += decode[7+(ofs)*4] * c; \ + c = hc[2+(ofs)]; \ + x0 += decode[8+(ofs)*4] * c; \ + x1 += decode[9+(ofs)*4] * c; \ + x2 += decode[10+(ofs)*4] * c; \ + x3 += decode[11+(ofs)*4] * c; \ + c = hc[3+(ofs)]; \ + y0 += decode[12+(ofs)*4] * c; \ + y1 += decode[13+(ofs)*4] * c; \ + y2 += decode[14+(ofs)*4] * c; \ + y3 += decode[15+(ofs)*4] * c; + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*4] * c; \ + x1 += decode[1+(ofs)*4] * c; \ + x2 += decode[2+(ofs)*4] * c; \ + x3 += decode[3+(ofs)*4] * c; + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*4] * c; \ + x1 += decode[1+(ofs)*4] * c; \ + x2 += decode[2+(ofs)*4] * c; \ + x3 += decode[3+(ofs)*4] * c; \ + c = hc[1+(ofs)]; \ + y0 += decode[4+(ofs)*4] * c; \ + y1 += decode[5+(ofs)*4] * c; \ + y2 += decode[6+(ofs)*4] * c; \ + y3 += decode[7+(ofs)*4] * c; + +#define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*4] * c; \ + x1 += decode[1+(ofs)*4] * c; \ + x2 += decode[2+(ofs)*4] * c; \ + x3 += decode[3+(ofs)*4] * c; \ + c = hc[1+(ofs)]; \ + y0 += decode[4+(ofs)*4] * c; \ + y1 += decode[5+(ofs)*4] * c; \ + y2 += decode[6+(ofs)*4] * c; \ + y3 += decode[7+(ofs)*4] * c; \ + c = hc[2+(ofs)]; \ + x0 += decode[8+(ofs)*4] * c; \ + x1 += decode[9+(ofs)*4] * c; \ + x2 += decode[10+(ofs)*4] * c; \ + x3 += decode[11+(ofs)*4] * c; + +#define stbir__store_output() \ + output[0] = x0 + y0; \ + output[1] = x1 + y1; \ + output[2] = x2 + y2; \ + output[3] = x3 + y3; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 4; + +#endif + +#define STBIR__horizontal_channels 4 +#define STB_IMAGE_RESIZE_DO_HORIZONTALS +#include STBIR__HEADER_FILENAME + + + +//================= +// Do 7 channel horizontal routines + +#ifdef STBIR_SIMD + +#define stbir__1_coeff_only() \ + stbir__simdf tot0,tot1,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1( c, hc ); \ + stbir__simdf_0123to0000( c, c ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_mult_mem( tot1, c, decode+3 ); + +#define stbir__2_coeff_only() \ + stbir__simdf tot0,tot1,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_mult_mem( tot1, c, decode+3 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+7 ); \ + stbir__simdf_madd_mem( tot1, tot1, c,decode+10 ); + +#define stbir__3_coeff_only() \ + stbir__simdf tot0,tot1,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_mult_mem( tot1, c, decode+3 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+7 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+10 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+14 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+17 ); + +#define stbir__store_output_tiny() \ + stbir__simdf_store( output+3, tot1 ); \ + stbir__simdf_store( output, tot0 ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 7; + +#ifdef STBIR_SIMD8 + +#define stbir__4_coeff_start() \ + stbir__simdf8 tot0,tot1,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc ); \ + stbir__simdf8_0123to00000000( c, cs ); \ + stbir__simdf8_mult_mem( tot0, c, decode ); \ + stbir__simdf8_0123to11111111( c, cs ); \ + stbir__simdf8_mult_mem( tot1, c, decode+7 ); \ + stbir__simdf8_0123to22222222( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+14 ); \ + stbir__simdf8_0123to33333333( c, cs ); \ + stbir__simdf8_madd_mem( tot1, tot1, c, decode+21 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00000000( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf8_0123to11111111( c, cs ); \ + stbir__simdf8_madd_mem( tot1, tot1, c, decode+(ofs)*7+7 ); \ + stbir__simdf8_0123to22222222( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*7+14 ); \ + stbir__simdf8_0123to33333333( c, cs ); \ + stbir__simdf8_madd_mem( tot1, tot1, c, decode+(ofs)*7+21 ); + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load1b( c, hc + (ofs) ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load1b( c, hc + (ofs) ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf8_load1b( c, hc + (ofs)+1 ); \ + stbir__simdf8_madd_mem( tot1, tot1, c, decode+(ofs)*7+7 ); + +#define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf8_load4b( cs, hc + (ofs) ); \ + stbir__simdf8_0123to00000000( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf8_0123to11111111( c, cs ); \ + stbir__simdf8_madd_mem( tot1, tot1, c, decode+(ofs)*7+7 ); \ + stbir__simdf8_0123to22222222( c, cs ); \ + stbir__simdf8_madd_mem( tot0, tot0, c, decode+(ofs)*7+14 ); + +#define stbir__store_output() \ + stbir__simdf8_add( tot0, tot0, tot1 ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 7; \ + if ( output < output_end ) \ + { \ + stbir__simdf8_store( output-7, tot0 ); \ + continue; \ + } \ + stbir__simdf_store( output-7+3, stbir__simdf_swiz(stbir__simdf8_gettop4(tot0),0,0,1,2) ); \ + stbir__simdf_store( output-7, stbir__if_simdf8_cast_to_simdf4(tot0) ); \ + break; + +#else + +#define stbir__4_coeff_start() \ + stbir__simdf tot0,tot1,tot2,tot3,c,cs; \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_mult_mem( tot0, c, decode ); \ + stbir__simdf_mult_mem( tot1, c, decode+3 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_mult_mem( tot2, c, decode+7 ); \ + stbir__simdf_mult_mem( tot3, c, decode+10 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+14 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+17 ); \ + stbir__simdf_0123to3333( c, cs ); \ + stbir__simdf_madd_mem( tot2, tot2, c, decode+21 ); \ + stbir__simdf_madd_mem( tot3, tot3, c, decode+24 ); + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*7+3 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot2, tot2, c, decode+(ofs)*7+7 ); \ + stbir__simdf_madd_mem( tot3, tot3, c, decode+(ofs)*7+10 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*7+14 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*7+17 ); \ + stbir__simdf_0123to3333( c, cs ); \ + stbir__simdf_madd_mem( tot2, tot2, c, decode+(ofs)*7+21 ); \ + stbir__simdf_madd_mem( tot3, tot3, c, decode+(ofs)*7+24 ); + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load1( c, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, c ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*7+3 ); \ + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load2( cs, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*7+3 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot2, tot2, c, decode+(ofs)*7+7 ); \ + stbir__simdf_madd_mem( tot3, tot3, c, decode+(ofs)*7+10 ); + +#define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + stbir__simdf_load( cs, hc + (ofs) ); \ + stbir__simdf_0123to0000( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*7 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*7+3 ); \ + stbir__simdf_0123to1111( c, cs ); \ + stbir__simdf_madd_mem( tot2, tot2, c, decode+(ofs)*7+7 ); \ + stbir__simdf_madd_mem( tot3, tot3, c, decode+(ofs)*7+10 ); \ + stbir__simdf_0123to2222( c, cs ); \ + stbir__simdf_madd_mem( tot0, tot0, c, decode+(ofs)*7+14 ); \ + stbir__simdf_madd_mem( tot1, tot1, c, decode+(ofs)*7+17 ); + +#define stbir__store_output() \ + stbir__simdf_add( tot0, tot0, tot2 ); \ + stbir__simdf_add( tot1, tot1, tot3 ); \ + stbir__simdf_store( output+3, tot1 ); \ + stbir__simdf_store( output, tot0 ); \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 7; + +#endif + +#else + +#define stbir__1_coeff_only() \ + float tot0, tot1, tot2, tot3, tot4, tot5, tot6, c; \ + c = hc[0]; \ + tot0 = decode[0]*c; \ + tot1 = decode[1]*c; \ + tot2 = decode[2]*c; \ + tot3 = decode[3]*c; \ + tot4 = decode[4]*c; \ + tot5 = decode[5]*c; \ + tot6 = decode[6]*c; + +#define stbir__2_coeff_only() \ + float tot0, tot1, tot2, tot3, tot4, tot5, tot6, c; \ + c = hc[0]; \ + tot0 = decode[0]*c; \ + tot1 = decode[1]*c; \ + tot2 = decode[2]*c; \ + tot3 = decode[3]*c; \ + tot4 = decode[4]*c; \ + tot5 = decode[5]*c; \ + tot6 = decode[6]*c; \ + c = hc[1]; \ + tot0 += decode[7]*c; \ + tot1 += decode[8]*c; \ + tot2 += decode[9]*c; \ + tot3 += decode[10]*c; \ + tot4 += decode[11]*c; \ + tot5 += decode[12]*c; \ + tot6 += decode[13]*c; \ + +#define stbir__3_coeff_only() \ + float tot0, tot1, tot2, tot3, tot4, tot5, tot6, c; \ + c = hc[0]; \ + tot0 = decode[0]*c; \ + tot1 = decode[1]*c; \ + tot2 = decode[2]*c; \ + tot3 = decode[3]*c; \ + tot4 = decode[4]*c; \ + tot5 = decode[5]*c; \ + tot6 = decode[6]*c; \ + c = hc[1]; \ + tot0 += decode[7]*c; \ + tot1 += decode[8]*c; \ + tot2 += decode[9]*c; \ + tot3 += decode[10]*c; \ + tot4 += decode[11]*c; \ + tot5 += decode[12]*c; \ + tot6 += decode[13]*c; \ + c = hc[2]; \ + tot0 += decode[14]*c; \ + tot1 += decode[15]*c; \ + tot2 += decode[16]*c; \ + tot3 += decode[17]*c; \ + tot4 += decode[18]*c; \ + tot5 += decode[19]*c; \ + tot6 += decode[20]*c; \ + +#define stbir__store_output_tiny() \ + output[0] = tot0; \ + output[1] = tot1; \ + output[2] = tot2; \ + output[3] = tot3; \ + output[4] = tot4; \ + output[5] = tot5; \ + output[6] = tot6; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 7; + +#define stbir__4_coeff_start() \ + float x0,x1,x2,x3,x4,x5,x6,y0,y1,y2,y3,y4,y5,y6,c; \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0]; \ + x0 = decode[0] * c; \ + x1 = decode[1] * c; \ + x2 = decode[2] * c; \ + x3 = decode[3] * c; \ + x4 = decode[4] * c; \ + x5 = decode[5] * c; \ + x6 = decode[6] * c; \ + c = hc[1]; \ + y0 = decode[7] * c; \ + y1 = decode[8] * c; \ + y2 = decode[9] * c; \ + y3 = decode[10] * c; \ + y4 = decode[11] * c; \ + y5 = decode[12] * c; \ + y6 = decode[13] * c; \ + c = hc[2]; \ + x0 += decode[14] * c; \ + x1 += decode[15] * c; \ + x2 += decode[16] * c; \ + x3 += decode[17] * c; \ + x4 += decode[18] * c; \ + x5 += decode[19] * c; \ + x6 += decode[20] * c; \ + c = hc[3]; \ + y0 += decode[21] * c; \ + y1 += decode[22] * c; \ + y2 += decode[23] * c; \ + y3 += decode[24] * c; \ + y4 += decode[25] * c; \ + y5 += decode[26] * c; \ + y6 += decode[27] * c; + +#define stbir__4_coeff_continue_from_4( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*7] * c; \ + x1 += decode[1+(ofs)*7] * c; \ + x2 += decode[2+(ofs)*7] * c; \ + x3 += decode[3+(ofs)*7] * c; \ + x4 += decode[4+(ofs)*7] * c; \ + x5 += decode[5+(ofs)*7] * c; \ + x6 += decode[6+(ofs)*7] * c; \ + c = hc[1+(ofs)]; \ + y0 += decode[7+(ofs)*7] * c; \ + y1 += decode[8+(ofs)*7] * c; \ + y2 += decode[9+(ofs)*7] * c; \ + y3 += decode[10+(ofs)*7] * c; \ + y4 += decode[11+(ofs)*7] * c; \ + y5 += decode[12+(ofs)*7] * c; \ + y6 += decode[13+(ofs)*7] * c; \ + c = hc[2+(ofs)]; \ + x0 += decode[14+(ofs)*7] * c; \ + x1 += decode[15+(ofs)*7] * c; \ + x2 += decode[16+(ofs)*7] * c; \ + x3 += decode[17+(ofs)*7] * c; \ + x4 += decode[18+(ofs)*7] * c; \ + x5 += decode[19+(ofs)*7] * c; \ + x6 += decode[20+(ofs)*7] * c; \ + c = hc[3+(ofs)]; \ + y0 += decode[21+(ofs)*7] * c; \ + y1 += decode[22+(ofs)*7] * c; \ + y2 += decode[23+(ofs)*7] * c; \ + y3 += decode[24+(ofs)*7] * c; \ + y4 += decode[25+(ofs)*7] * c; \ + y5 += decode[26+(ofs)*7] * c; \ + y6 += decode[27+(ofs)*7] * c; + +#define stbir__1_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*7] * c; \ + x1 += decode[1+(ofs)*7] * c; \ + x2 += decode[2+(ofs)*7] * c; \ + x3 += decode[3+(ofs)*7] * c; \ + x4 += decode[4+(ofs)*7] * c; \ + x5 += decode[5+(ofs)*7] * c; \ + x6 += decode[6+(ofs)*7] * c; \ + +#define stbir__2_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*7] * c; \ + x1 += decode[1+(ofs)*7] * c; \ + x2 += decode[2+(ofs)*7] * c; \ + x3 += decode[3+(ofs)*7] * c; \ + x4 += decode[4+(ofs)*7] * c; \ + x5 += decode[5+(ofs)*7] * c; \ + x6 += decode[6+(ofs)*7] * c; \ + c = hc[1+(ofs)]; \ + y0 += decode[7+(ofs)*7] * c; \ + y1 += decode[8+(ofs)*7] * c; \ + y2 += decode[9+(ofs)*7] * c; \ + y3 += decode[10+(ofs)*7] * c; \ + y4 += decode[11+(ofs)*7] * c; \ + y5 += decode[12+(ofs)*7] * c; \ + y6 += decode[13+(ofs)*7] * c; \ + +#define stbir__3_coeff_remnant( ofs ) \ + STBIR_SIMD_NO_UNROLL(decode); \ + c = hc[0+(ofs)]; \ + x0 += decode[0+(ofs)*7] * c; \ + x1 += decode[1+(ofs)*7] * c; \ + x2 += decode[2+(ofs)*7] * c; \ + x3 += decode[3+(ofs)*7] * c; \ + x4 += decode[4+(ofs)*7] * c; \ + x5 += decode[5+(ofs)*7] * c; \ + x6 += decode[6+(ofs)*7] * c; \ + c = hc[1+(ofs)]; \ + y0 += decode[7+(ofs)*7] * c; \ + y1 += decode[8+(ofs)*7] * c; \ + y2 += decode[9+(ofs)*7] * c; \ + y3 += decode[10+(ofs)*7] * c; \ + y4 += decode[11+(ofs)*7] * c; \ + y5 += decode[12+(ofs)*7] * c; \ + y6 += decode[13+(ofs)*7] * c; \ + c = hc[2+(ofs)]; \ + x0 += decode[14+(ofs)*7] * c; \ + x1 += decode[15+(ofs)*7] * c; \ + x2 += decode[16+(ofs)*7] * c; \ + x3 += decode[17+(ofs)*7] * c; \ + x4 += decode[18+(ofs)*7] * c; \ + x5 += decode[19+(ofs)*7] * c; \ + x6 += decode[20+(ofs)*7] * c; \ + +#define stbir__store_output() \ + output[0] = x0 + y0; \ + output[1] = x1 + y1; \ + output[2] = x2 + y2; \ + output[3] = x3 + y3; \ + output[4] = x4 + y4; \ + output[5] = x5 + y5; \ + output[6] = x6 + y6; \ + horizontal_coefficients += coefficient_width; \ + ++horizontal_contributors; \ + output += 7; + +#endif + +#define STBIR__horizontal_channels 7 +#define STB_IMAGE_RESIZE_DO_HORIZONTALS +#include STBIR__HEADER_FILENAME + + +// include all of the vertical resamplers (both scatter and gather versions) + +#define STBIR__vertical_channels 1 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 1 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 2 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 2 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 3 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 3 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 4 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 4 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 5 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 5 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 6 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 6 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 7 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 7 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 8 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#include STBIR__HEADER_FILENAME + +#define STBIR__vertical_channels 8 +#define STB_IMAGE_RESIZE_DO_VERTICALS +#define STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#include STBIR__HEADER_FILENAME + +typedef void STBIR_VERTICAL_GATHERFUNC( float * output, float const * coeffs, float const ** inputs, float const * input0_end ); + +static STBIR_VERTICAL_GATHERFUNC * stbir__vertical_gathers[ 8 ] = +{ + stbir__vertical_gather_with_1_coeffs,stbir__vertical_gather_with_2_coeffs,stbir__vertical_gather_with_3_coeffs,stbir__vertical_gather_with_4_coeffs,stbir__vertical_gather_with_5_coeffs,stbir__vertical_gather_with_6_coeffs,stbir__vertical_gather_with_7_coeffs,stbir__vertical_gather_with_8_coeffs +}; + +static STBIR_VERTICAL_GATHERFUNC * stbir__vertical_gathers_continues[ 8 ] = +{ + stbir__vertical_gather_with_1_coeffs_cont,stbir__vertical_gather_with_2_coeffs_cont,stbir__vertical_gather_with_3_coeffs_cont,stbir__vertical_gather_with_4_coeffs_cont,stbir__vertical_gather_with_5_coeffs_cont,stbir__vertical_gather_with_6_coeffs_cont,stbir__vertical_gather_with_7_coeffs_cont,stbir__vertical_gather_with_8_coeffs_cont +}; + +typedef void STBIR_VERTICAL_SCATTERFUNC( float ** outputs, float const * coeffs, float const * input, float const * input_end ); + +static STBIR_VERTICAL_SCATTERFUNC * stbir__vertical_scatter_sets[ 8 ] = +{ + stbir__vertical_scatter_with_1_coeffs,stbir__vertical_scatter_with_2_coeffs,stbir__vertical_scatter_with_3_coeffs,stbir__vertical_scatter_with_4_coeffs,stbir__vertical_scatter_with_5_coeffs,stbir__vertical_scatter_with_6_coeffs,stbir__vertical_scatter_with_7_coeffs,stbir__vertical_scatter_with_8_coeffs +}; + +static STBIR_VERTICAL_SCATTERFUNC * stbir__vertical_scatter_blends[ 8 ] = +{ + stbir__vertical_scatter_with_1_coeffs_cont,stbir__vertical_scatter_with_2_coeffs_cont,stbir__vertical_scatter_with_3_coeffs_cont,stbir__vertical_scatter_with_4_coeffs_cont,stbir__vertical_scatter_with_5_coeffs_cont,stbir__vertical_scatter_with_6_coeffs_cont,stbir__vertical_scatter_with_7_coeffs_cont,stbir__vertical_scatter_with_8_coeffs_cont +}; + + +static void stbir__encode_scanline( stbir__info const * stbir_info, void *output_buffer_data, float * encode_buffer, int row STBIR_ONLY_PROFILE_GET_SPLIT_INFO ) +{ + int num_pixels = stbir_info->horizontal.scale_info.output_sub_size; + int channels = stbir_info->channels; + int width_times_channels = num_pixels * channels; + void * output_buffer; + + // un-alpha weight if we need to + if ( stbir_info->alpha_unweight ) + { + STBIR_PROFILE_START( unalpha ); + stbir_info->alpha_unweight( encode_buffer, width_times_channels ); + STBIR_PROFILE_END( unalpha ); + } + + // write directly into output by default + output_buffer = output_buffer_data; + + // if we have an output callback, we first convert the decode buffer in place (and then hand that to the callback) + if ( stbir_info->out_pixels_cb ) + output_buffer = encode_buffer; + + STBIR_PROFILE_START( encode ); + // convert into the output buffer + stbir_info->encode_pixels( output_buffer, width_times_channels, encode_buffer ); + STBIR_PROFILE_END( encode ); + + // if we have an output callback, call it to send the data + if ( stbir_info->out_pixels_cb ) + stbir_info->out_pixels_cb( output_buffer, num_pixels, row, stbir_info->user_data ); +} + + +// Get the ring buffer pointer for an index +static float* stbir__get_ring_buffer_entry(stbir__info const * stbir_info, stbir__per_split_info const * split_info, int index ) +{ + STBIR_ASSERT( index < stbir_info->ring_buffer_num_entries ); + + #ifdef STBIR__SEPARATE_ALLOCATIONS + return split_info->ring_buffers[ index ]; + #else + return (float*) ( ( (char*) split_info->ring_buffer ) + ( index * stbir_info->ring_buffer_length_bytes ) ); + #endif +} + +// Get the specified scan line from the ring buffer +static float* stbir__get_ring_buffer_scanline(stbir__info const * stbir_info, stbir__per_split_info const * split_info, int get_scanline) +{ + int ring_buffer_index = (split_info->ring_buffer_begin_index + (get_scanline - split_info->ring_buffer_first_scanline)) % stbir_info->ring_buffer_num_entries; + return stbir__get_ring_buffer_entry( stbir_info, split_info, ring_buffer_index ); +} + +static void stbir__resample_horizontal_gather(stbir__info const * stbir_info, float* output_buffer, float const * input_buffer STBIR_ONLY_PROFILE_GET_SPLIT_INFO ) +{ + float const * decode_buffer = input_buffer - ( stbir_info->scanline_extents.conservative.n0 * stbir_info->effective_channels ); + + STBIR_PROFILE_START( horizontal ); + if ( ( stbir_info->horizontal.filter_enum == STBIR_FILTER_POINT_SAMPLE ) && ( stbir_info->horizontal.scale_info.scale == 1.0f ) ) + STBIR_MEMCPY( output_buffer, input_buffer, stbir_info->horizontal.scale_info.output_sub_size * sizeof( float ) * stbir_info->effective_channels ); + else + stbir_info->horizontal_gather_channels( output_buffer, stbir_info->horizontal.scale_info.output_sub_size, decode_buffer, stbir_info->horizontal.contributors, stbir_info->horizontal.coefficients, stbir_info->horizontal.coefficient_width ); + STBIR_PROFILE_END( horizontal ); +} + +static void stbir__resample_vertical_gather(stbir__info const * stbir_info, stbir__per_split_info* split_info, int n, int contrib_n0, int contrib_n1, float const * vertical_coefficients ) +{ + float* encode_buffer = split_info->vertical_buffer; + float* decode_buffer = split_info->decode_buffer; + int vertical_first = stbir_info->vertical_first; + int width = (vertical_first) ? ( stbir_info->scanline_extents.conservative.n1-stbir_info->scanline_extents.conservative.n0+1 ) : stbir_info->horizontal.scale_info.output_sub_size; + int width_times_channels = stbir_info->effective_channels * width; + + STBIR_ASSERT( stbir_info->vertical.is_gather ); + + // loop over the contributing scanlines and scale into the buffer + STBIR_PROFILE_START( vertical ); + { + int k = 0, total = contrib_n1 - contrib_n0 + 1; + STBIR_ASSERT( total > 0 ); + do { + float const * inputs[8]; + int i, cnt = total; if ( cnt > 8 ) cnt = 8; + for( i = 0 ; i < cnt ; i++ ) + inputs[ i ] = stbir__get_ring_buffer_scanline(stbir_info, split_info, k+i+contrib_n0 ); + + // call the N scanlines at a time function (up to 8 scanlines of blending at once) + ((k==0)?stbir__vertical_gathers:stbir__vertical_gathers_continues)[cnt-1]( (vertical_first) ? decode_buffer : encode_buffer, vertical_coefficients + k, inputs, inputs[0] + width_times_channels ); + k += cnt; + total -= cnt; + } while ( total ); + } + STBIR_PROFILE_END( vertical ); + + if ( vertical_first ) + { + // Now resample the gathered vertical data in the horizontal axis into the encode buffer + stbir__resample_horizontal_gather(stbir_info, encode_buffer, decode_buffer STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + } + + stbir__encode_scanline( stbir_info, ( (char *) stbir_info->output_data ) + ((size_t)n * (size_t)stbir_info->output_stride_bytes), + encode_buffer, n STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); +} + +static void stbir__decode_and_resample_for_vertical_gather_loop(stbir__info const * stbir_info, stbir__per_split_info* split_info, int n) +{ + int ring_buffer_index; + float* ring_buffer; + + // Decode the nth scanline from the source image into the decode buffer. + stbir__decode_scanline( stbir_info, n, split_info->decode_buffer STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // update new end scanline + split_info->ring_buffer_last_scanline = n; + + // get ring buffer + ring_buffer_index = (split_info->ring_buffer_begin_index + (split_info->ring_buffer_last_scanline - split_info->ring_buffer_first_scanline)) % stbir_info->ring_buffer_num_entries; + ring_buffer = stbir__get_ring_buffer_entry(stbir_info, split_info, ring_buffer_index); + + // Now resample it into the ring buffer. + stbir__resample_horizontal_gather( stbir_info, ring_buffer, split_info->decode_buffer STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // Now it's sitting in the ring buffer ready to be used as source for the vertical sampling. +} + +static void stbir__vertical_gather_loop( stbir__info const * stbir_info, stbir__per_split_info* split_info, int split_count ) +{ + int y, start_output_y, end_output_y; + stbir__contributors* vertical_contributors = stbir_info->vertical.contributors; + float const * vertical_coefficients = stbir_info->vertical.coefficients; + + STBIR_ASSERT( stbir_info->vertical.is_gather ); + + start_output_y = split_info->start_output_y; + end_output_y = split_info[split_count-1].end_output_y; + + vertical_contributors += start_output_y; + vertical_coefficients += start_output_y * stbir_info->vertical.coefficient_width; + + // initialize the ring buffer for gathering + split_info->ring_buffer_begin_index = 0; + split_info->ring_buffer_first_scanline = vertical_contributors->n0; + split_info->ring_buffer_last_scanline = split_info->ring_buffer_first_scanline - 1; // means "empty" + + for (y = start_output_y; y < end_output_y; y++) + { + int in_first_scanline, in_last_scanline; + + in_first_scanline = vertical_contributors->n0; + in_last_scanline = vertical_contributors->n1; + + // make sure the indexing hasn't broken + STBIR_ASSERT( in_first_scanline >= split_info->ring_buffer_first_scanline ); + + // Load in new scanlines + while (in_last_scanline > split_info->ring_buffer_last_scanline) + { + STBIR_ASSERT( ( split_info->ring_buffer_last_scanline - split_info->ring_buffer_first_scanline + 1 ) <= stbir_info->ring_buffer_num_entries ); + + // make sure there was room in the ring buffer when we add new scanlines + if ( ( split_info->ring_buffer_last_scanline - split_info->ring_buffer_first_scanline + 1 ) == stbir_info->ring_buffer_num_entries ) + { + split_info->ring_buffer_first_scanline++; + split_info->ring_buffer_begin_index++; + } + + if ( stbir_info->vertical_first ) + { + float * ring_buffer = stbir__get_ring_buffer_scanline( stbir_info, split_info, ++split_info->ring_buffer_last_scanline ); + // Decode the nth scanline from the source image into the decode buffer. + stbir__decode_scanline( stbir_info, split_info->ring_buffer_last_scanline, ring_buffer STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + } + else + { + stbir__decode_and_resample_for_vertical_gather_loop(stbir_info, split_info, split_info->ring_buffer_last_scanline + 1); + } + } + + // Now all buffers should be ready to write a row of vertical sampling, so do it. + stbir__resample_vertical_gather(stbir_info, split_info, y, in_first_scanline, in_last_scanline, vertical_coefficients ); + + ++vertical_contributors; + vertical_coefficients += stbir_info->vertical.coefficient_width; + } +} + +#define STBIR__FLOAT_EMPTY_MARKER 3.0e+38F +#define STBIR__FLOAT_BUFFER_IS_EMPTY(ptr) ((ptr)[0]==STBIR__FLOAT_EMPTY_MARKER) + +static void stbir__encode_first_scanline_from_scatter(stbir__info const * stbir_info, stbir__per_split_info* split_info) +{ + // evict a scanline out into the output buffer + float* ring_buffer_entry = stbir__get_ring_buffer_entry(stbir_info, split_info, split_info->ring_buffer_begin_index ); + + // dump the scanline out + stbir__encode_scanline( stbir_info, ( (char *)stbir_info->output_data ) + ( (size_t)split_info->ring_buffer_first_scanline * (size_t)stbir_info->output_stride_bytes ), ring_buffer_entry, split_info->ring_buffer_first_scanline STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // mark it as empty + ring_buffer_entry[ 0 ] = STBIR__FLOAT_EMPTY_MARKER; + + // advance the first scanline + split_info->ring_buffer_first_scanline++; + if ( ++split_info->ring_buffer_begin_index == stbir_info->ring_buffer_num_entries ) + split_info->ring_buffer_begin_index = 0; +} + +static void stbir__horizontal_resample_and_encode_first_scanline_from_scatter(stbir__info const * stbir_info, stbir__per_split_info* split_info) +{ + // evict a scanline out into the output buffer + + float* ring_buffer_entry = stbir__get_ring_buffer_entry(stbir_info, split_info, split_info->ring_buffer_begin_index ); + + // Now resample it into the buffer. + stbir__resample_horizontal_gather( stbir_info, split_info->vertical_buffer, ring_buffer_entry STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // dump the scanline out + stbir__encode_scanline( stbir_info, ( (char *)stbir_info->output_data ) + ( (size_t)split_info->ring_buffer_first_scanline * (size_t)stbir_info->output_stride_bytes ), split_info->vertical_buffer, split_info->ring_buffer_first_scanline STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // mark it as empty + ring_buffer_entry[ 0 ] = STBIR__FLOAT_EMPTY_MARKER; + + // advance the first scanline + split_info->ring_buffer_first_scanline++; + if ( ++split_info->ring_buffer_begin_index == stbir_info->ring_buffer_num_entries ) + split_info->ring_buffer_begin_index = 0; +} + +static void stbir__resample_vertical_scatter(stbir__info const * stbir_info, stbir__per_split_info* split_info, int n0, int n1, float const * vertical_coefficients, float const * vertical_buffer, float const * vertical_buffer_end ) +{ + STBIR_ASSERT( !stbir_info->vertical.is_gather ); + + STBIR_PROFILE_START( vertical ); + { + int k = 0, total = n1 - n0 + 1; + STBIR_ASSERT( total > 0 ); + do { + float * outputs[8]; + int i, n = total; if ( n > 8 ) n = 8; + for( i = 0 ; i < n ; i++ ) + { + outputs[ i ] = stbir__get_ring_buffer_scanline(stbir_info, split_info, k+i+n0 ); + if ( ( i ) && ( STBIR__FLOAT_BUFFER_IS_EMPTY( outputs[i] ) != STBIR__FLOAT_BUFFER_IS_EMPTY( outputs[0] ) ) ) // make sure runs are of the same type + { + n = i; + break; + } + } + // call the scatter to N scanlines at a time function (up to 8 scanlines of scattering at once) + ((STBIR__FLOAT_BUFFER_IS_EMPTY( outputs[0] ))?stbir__vertical_scatter_sets:stbir__vertical_scatter_blends)[n-1]( outputs, vertical_coefficients + k, vertical_buffer, vertical_buffer_end ); + k += n; + total -= n; + } while ( total ); + } + + STBIR_PROFILE_END( vertical ); +} + +typedef void stbir__handle_scanline_for_scatter_func(stbir__info const * stbir_info, stbir__per_split_info* split_info); + +static void stbir__vertical_scatter_loop( stbir__info const * stbir_info, stbir__per_split_info* split_info, int split_count ) +{ + int y, start_output_y, end_output_y, start_input_y, end_input_y; + stbir__contributors* vertical_contributors = stbir_info->vertical.contributors; + float const * vertical_coefficients = stbir_info->vertical.coefficients; + stbir__handle_scanline_for_scatter_func * handle_scanline_for_scatter; + void * scanline_scatter_buffer; + void * scanline_scatter_buffer_end; + int on_first_input_y, last_input_y; + + STBIR_ASSERT( !stbir_info->vertical.is_gather ); + + start_output_y = split_info->start_output_y; + end_output_y = split_info[split_count-1].end_output_y; // may do multiple split counts + + start_input_y = split_info->start_input_y; + end_input_y = split_info[split_count-1].end_input_y; + + // adjust for starting offset start_input_y + y = start_input_y + stbir_info->vertical.filter_pixel_margin; + vertical_contributors += y ; + vertical_coefficients += stbir_info->vertical.coefficient_width * y; + + if ( stbir_info->vertical_first ) + { + handle_scanline_for_scatter = stbir__horizontal_resample_and_encode_first_scanline_from_scatter; + scanline_scatter_buffer = split_info->decode_buffer; + scanline_scatter_buffer_end = ( (char*) scanline_scatter_buffer ) + sizeof( float ) * stbir_info->effective_channels * (stbir_info->scanline_extents.conservative.n1-stbir_info->scanline_extents.conservative.n0+1); + } + else + { + handle_scanline_for_scatter = stbir__encode_first_scanline_from_scatter; + scanline_scatter_buffer = split_info->vertical_buffer; + scanline_scatter_buffer_end = ( (char*) scanline_scatter_buffer ) + sizeof( float ) * stbir_info->effective_channels * stbir_info->horizontal.scale_info.output_sub_size; + } + + // initialize the ring buffer for scattering + split_info->ring_buffer_first_scanline = start_output_y; + split_info->ring_buffer_last_scanline = -1; + split_info->ring_buffer_begin_index = -1; + + // mark all the buffers as empty to start + for( y = 0 ; y < stbir_info->ring_buffer_num_entries ; y++ ) + stbir__get_ring_buffer_entry( stbir_info, split_info, y )[0] = STBIR__FLOAT_EMPTY_MARKER; // only used on scatter + + // do the loop in input space + on_first_input_y = 1; last_input_y = start_input_y; + for (y = start_input_y ; y < end_input_y; y++) + { + int out_first_scanline, out_last_scanline; + + out_first_scanline = vertical_contributors->n0; + out_last_scanline = vertical_contributors->n1; + + STBIR_ASSERT(out_last_scanline - out_first_scanline + 1 <= stbir_info->ring_buffer_num_entries); + + if ( ( out_last_scanline >= out_first_scanline ) && ( ( ( out_first_scanline >= start_output_y ) && ( out_first_scanline < end_output_y ) ) || ( ( out_last_scanline >= start_output_y ) && ( out_last_scanline < end_output_y ) ) ) ) + { + float const * vc = vertical_coefficients; + + // keep track of the range actually seen for the next resize + last_input_y = y; + if ( ( on_first_input_y ) && ( y > start_input_y ) ) + split_info->start_input_y = y; + on_first_input_y = 0; + + // clip the region + if ( out_first_scanline < start_output_y ) + { + vc += start_output_y - out_first_scanline; + out_first_scanline = start_output_y; + } + + if ( out_last_scanline >= end_output_y ) + out_last_scanline = end_output_y - 1; + + // if very first scanline, init the index + if (split_info->ring_buffer_begin_index < 0) + split_info->ring_buffer_begin_index = out_first_scanline - start_output_y; + + STBIR_ASSERT( split_info->ring_buffer_begin_index <= out_first_scanline ); + + // Decode the nth scanline from the source image into the decode buffer. + stbir__decode_scanline( stbir_info, y, split_info->decode_buffer STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // When horizontal first, we resample horizontally into the vertical buffer before we scatter it out + if ( !stbir_info->vertical_first ) + stbir__resample_horizontal_gather( stbir_info, split_info->vertical_buffer, split_info->decode_buffer STBIR_ONLY_PROFILE_SET_SPLIT_INFO ); + + // Now it's sitting in the buffer ready to be distributed into the ring buffers. + + // evict from the ringbuffer, if we need are full + if ( ( ( split_info->ring_buffer_last_scanline - split_info->ring_buffer_first_scanline + 1 ) == stbir_info->ring_buffer_num_entries ) && + ( out_last_scanline > split_info->ring_buffer_last_scanline ) ) + handle_scanline_for_scatter( stbir_info, split_info ); + + // Now the horizontal buffer is ready to write to all ring buffer rows, so do it. + stbir__resample_vertical_scatter(stbir_info, split_info, out_first_scanline, out_last_scanline, vc, (float*)scanline_scatter_buffer, (float*)scanline_scatter_buffer_end ); + + // update the end of the buffer + if ( out_last_scanline > split_info->ring_buffer_last_scanline ) + split_info->ring_buffer_last_scanline = out_last_scanline; + } + ++vertical_contributors; + vertical_coefficients += stbir_info->vertical.coefficient_width; + } + + // now evict the scanlines that are left over in the ring buffer + while ( split_info->ring_buffer_first_scanline < end_output_y ) + handle_scanline_for_scatter(stbir_info, split_info); + + // update the end_input_y if we do multiple resizes with the same data + ++last_input_y; + for( y = 0 ; y < split_count; y++ ) + if ( split_info[y].end_input_y > last_input_y ) + split_info[y].end_input_y = last_input_y; +} + + +static stbir__kernel_callback * stbir__builtin_kernels[] = { 0, stbir__filter_trapezoid, stbir__filter_triangle, stbir__filter_cubic, stbir__filter_catmullrom, stbir__filter_mitchell, stbir__filter_point }; +static stbir__support_callback * stbir__builtin_supports[] = { 0, stbir__support_trapezoid, stbir__support_one, stbir__support_two, stbir__support_two, stbir__support_two, stbir__support_zeropoint5 }; + +static void stbir__set_sampler(stbir__sampler * samp, stbir_filter filter, stbir__kernel_callback * kernel, stbir__support_callback * support, stbir_edge edge, stbir__scale_info * scale_info, int always_gather, void * user_data ) +{ + // set filter + if (filter == 0) + { + filter = STBIR_DEFAULT_FILTER_DOWNSAMPLE; // default to downsample + if (scale_info->scale >= ( 1.0f - stbir__small_float ) ) + { + if ( (scale_info->scale <= ( 1.0f + stbir__small_float ) ) && ( STBIR_CEILF(scale_info->pixel_shift) == scale_info->pixel_shift ) ) + filter = STBIR_FILTER_POINT_SAMPLE; + else + filter = STBIR_DEFAULT_FILTER_UPSAMPLE; + } + } + samp->filter_enum = filter; + + STBIR_ASSERT(samp->filter_enum != 0); + STBIR_ASSERT((unsigned)samp->filter_enum < STBIR_FILTER_OTHER); + samp->filter_kernel = stbir__builtin_kernels[ filter ]; + samp->filter_support = stbir__builtin_supports[ filter ]; + + if ( kernel && support ) + { + samp->filter_kernel = kernel; + samp->filter_support = support; + samp->filter_enum = STBIR_FILTER_OTHER; + } + + samp->edge = edge; + samp->filter_pixel_width = stbir__get_filter_pixel_width (samp->filter_support, scale_info->scale, user_data ); + // Gather is always better, but in extreme downsamples, you have to most or all of the data in memory + // For horizontal, we always have all the pixels, so we always use gather here (always_gather==1). + // For vertical, we use gather if scaling up (which means we will have samp->filter_pixel_width + // scanlines in memory at once). + samp->is_gather = 0; + if ( scale_info->scale >= ( 1.0f - stbir__small_float ) ) + samp->is_gather = 1; + else if ( ( always_gather ) || ( samp->filter_pixel_width <= STBIR_FORCE_GATHER_FILTER_SCANLINES_AMOUNT ) ) + samp->is_gather = 2; + + // pre calculate stuff based on the above + samp->coefficient_width = stbir__get_coefficient_width(samp, samp->is_gather, user_data); + + // filter_pixel_width is the conservative size in pixels of input that affect an output pixel. + // In rare cases (only with 2 pix to 1 pix with the default filters), it's possible that the + // filter will extend before or after the scanline beyond just one extra entire copy of the + // scanline (we would hit the edge twice). We don't let you do that, so we clamp the total + // width to 3x the total of input pixel (once for the scanline, once for the left side + // overhang, and once for the right side). We only do this for edge mode, since the other + // modes can just re-edge clamp back in again. + if ( edge == STBIR_EDGE_WRAP ) + if ( samp->filter_pixel_width > ( scale_info->input_full_size * 3 ) ) + samp->filter_pixel_width = scale_info->input_full_size * 3; + + // This is how much to expand buffers to account for filters seeking outside + // the image boundaries. + samp->filter_pixel_margin = samp->filter_pixel_width / 2; + + // filter_pixel_margin is the amount that this filter can overhang on just one side of either + // end of the scanline (left or the right). Since we only allow you to overhang 1 scanline's + // worth of pixels, we clamp this one side of overhang to the input scanline size. Again, + // this clamping only happens in rare cases with the default filters (2 pix to 1 pix). + if ( edge == STBIR_EDGE_WRAP ) + if ( samp->filter_pixel_margin > scale_info->input_full_size ) + samp->filter_pixel_margin = scale_info->input_full_size; + + samp->num_contributors = stbir__get_contributors(samp, samp->is_gather); + + samp->contributors_size = samp->num_contributors * sizeof(stbir__contributors); + samp->coefficients_size = samp->num_contributors * samp->coefficient_width * sizeof(float) + sizeof(float); // extra sizeof(float) is padding + + samp->gather_prescatter_contributors = 0; + samp->gather_prescatter_coefficients = 0; + if ( samp->is_gather == 0 ) + { + samp->gather_prescatter_coefficient_width = samp->filter_pixel_width; + samp->gather_prescatter_num_contributors = stbir__get_contributors(samp, 2); + samp->gather_prescatter_contributors_size = samp->gather_prescatter_num_contributors * sizeof(stbir__contributors); + samp->gather_prescatter_coefficients_size = samp->gather_prescatter_num_contributors * samp->gather_prescatter_coefficient_width * sizeof(float); + } +} + +static void stbir__get_conservative_extents( stbir__sampler * samp, stbir__contributors * range, void * user_data ) +{ + float scale = samp->scale_info.scale; + float out_shift = samp->scale_info.pixel_shift; + stbir__support_callback * support = samp->filter_support; + int input_full_size = samp->scale_info.input_full_size; + stbir_edge edge = samp->edge; + float inv_scale = samp->scale_info.inv_scale; + + STBIR_ASSERT( samp->is_gather != 0 ); + + if ( samp->is_gather == 1 ) + { + int in_first_pixel, in_last_pixel; + float out_filter_radius = support(inv_scale, user_data) * scale; + + stbir__calculate_in_pixel_range( &in_first_pixel, &in_last_pixel, 0.5, out_filter_radius, inv_scale, out_shift, input_full_size, edge ); + range->n0 = in_first_pixel; + stbir__calculate_in_pixel_range( &in_first_pixel, &in_last_pixel, ( (float)(samp->scale_info.output_sub_size-1) ) + 0.5f, out_filter_radius, inv_scale, out_shift, input_full_size, edge ); + range->n1 = in_last_pixel; + } + else if ( samp->is_gather == 2 ) // downsample gather, refine + { + float in_pixels_radius = support(scale, user_data) * inv_scale; + int filter_pixel_margin = samp->filter_pixel_margin; + int output_sub_size = samp->scale_info.output_sub_size; + int input_end; + int n; + int in_first_pixel, in_last_pixel; + + // get a conservative area of the input range + stbir__calculate_in_pixel_range( &in_first_pixel, &in_last_pixel, 0, 0, inv_scale, out_shift, input_full_size, edge ); + range->n0 = in_first_pixel; + stbir__calculate_in_pixel_range( &in_first_pixel, &in_last_pixel, (float)output_sub_size, 0, inv_scale, out_shift, input_full_size, edge ); + range->n1 = in_last_pixel; + + // now go through the margin to the start of area to find bottom + n = range->n0 + 1; + input_end = -filter_pixel_margin; + while( n >= input_end ) + { + int out_first_pixel, out_last_pixel; + stbir__calculate_out_pixel_range( &out_first_pixel, &out_last_pixel, ((float)n)+0.5f, in_pixels_radius, scale, out_shift, output_sub_size ); + if ( out_first_pixel > out_last_pixel ) + break; + + if ( ( out_first_pixel < output_sub_size ) || ( out_last_pixel >= 0 ) ) + range->n0 = n; + --n; + } + + // now go through the end of the area through the margin to find top + n = range->n1 - 1; + input_end = n + 1 + filter_pixel_margin; + while( n <= input_end ) + { + int out_first_pixel, out_last_pixel; + stbir__calculate_out_pixel_range( &out_first_pixel, &out_last_pixel, ((float)n)+0.5f, in_pixels_radius, scale, out_shift, output_sub_size ); + if ( out_first_pixel > out_last_pixel ) + break; + if ( ( out_first_pixel < output_sub_size ) || ( out_last_pixel >= 0 ) ) + range->n1 = n; + ++n; + } + } + + if ( samp->edge == STBIR_EDGE_WRAP ) + { + // if we are wrapping, and we are very close to the image size (so the edges might merge), just use the scanline up to the edge + if ( ( range->n0 > 0 ) && ( range->n1 >= input_full_size ) ) + { + int marg = range->n1 - input_full_size + 1; + if ( ( marg + STBIR__MERGE_RUNS_PIXEL_THRESHOLD ) >= range->n0 ) + range->n0 = 0; + } + if ( ( range->n0 < 0 ) && ( range->n1 < (input_full_size-1) ) ) + { + int marg = -range->n0; + if ( ( input_full_size - marg - STBIR__MERGE_RUNS_PIXEL_THRESHOLD - 1 ) <= range->n1 ) + range->n1 = input_full_size - 1; + } + } + else + { + // for non-edge-wrap modes, we never read over the edge, so clamp + if ( range->n0 < 0 ) + range->n0 = 0; + if ( range->n1 >= input_full_size ) + range->n1 = input_full_size - 1; + } +} + +static void stbir__get_split_info( stbir__per_split_info* split_info, int splits, int output_height, int vertical_pixel_margin, int input_full_height ) +{ + int i, cur; + int left = output_height; + + cur = 0; + for( i = 0 ; i < splits ; i++ ) + { + int each; + split_info[i].start_output_y = cur; + each = left / ( splits - i ); + split_info[i].end_output_y = cur + each; + cur += each; + left -= each; + + // scatter range (updated to minimum as you run it) + split_info[i].start_input_y = -vertical_pixel_margin; + split_info[i].end_input_y = input_full_height + vertical_pixel_margin; + } +} + +static void stbir__free_internal_mem( stbir__info *info ) +{ + #define STBIR__FREE_AND_CLEAR( ptr ) { if ( ptr ) { void * p = (ptr); (ptr) = 0; STBIR_FREE( p, info->user_data); } } + + if ( info ) + { + #ifndef STBIR__SEPARATE_ALLOCATIONS + STBIR__FREE_AND_CLEAR( info->alloced_mem ); + #else + int i,j; + + if ( ( info->vertical.gather_prescatter_contributors ) && ( (void*)info->vertical.gather_prescatter_contributors != (void*)info->split_info[0].decode_buffer ) ) + { + STBIR__FREE_AND_CLEAR( info->vertical.gather_prescatter_coefficients ); + STBIR__FREE_AND_CLEAR( info->vertical.gather_prescatter_contributors ); + } + for( i = 0 ; i < info->splits ; i++ ) + { + for( j = 0 ; j < info->alloc_ring_buffer_num_entries ; j++ ) + { + #ifdef STBIR_SIMD8 + if ( info->effective_channels == 3 ) + --info->split_info[i].ring_buffers[j]; // avx in 3 channel mode needs one float at the start of the buffer + #endif + STBIR__FREE_AND_CLEAR( info->split_info[i].ring_buffers[j] ); + } + + #ifdef STBIR_SIMD8 + if ( info->effective_channels == 3 ) + --info->split_info[i].decode_buffer; // avx in 3 channel mode needs one float at the start of the buffer + #endif + STBIR__FREE_AND_CLEAR( info->split_info[i].decode_buffer ); + STBIR__FREE_AND_CLEAR( info->split_info[i].ring_buffers ); + STBIR__FREE_AND_CLEAR( info->split_info[i].vertical_buffer ); + } + STBIR__FREE_AND_CLEAR( info->split_info ); + if ( info->vertical.coefficients != info->horizontal.coefficients ) + { + STBIR__FREE_AND_CLEAR( info->vertical.coefficients ); + STBIR__FREE_AND_CLEAR( info->vertical.contributors ); + } + STBIR__FREE_AND_CLEAR( info->horizontal.coefficients ); + STBIR__FREE_AND_CLEAR( info->horizontal.contributors ); + STBIR__FREE_AND_CLEAR( info->alloced_mem ); + STBIR_FREE( info, info->user_data ); + #endif + } + + #undef STBIR__FREE_AND_CLEAR +} + +static int stbir__get_max_split( int splits, int height ) +{ + int i; + int max = 0; + + for( i = 0 ; i < splits ; i++ ) + { + int each = height / ( splits - i ); + if ( each > max ) + max = each; + height -= each; + } + return max; +} + +static stbir__horizontal_gather_channels_func ** stbir__horizontal_gather_n_coeffs_funcs[8] = +{ + 0, stbir__horizontal_gather_1_channels_with_n_coeffs_funcs, stbir__horizontal_gather_2_channels_with_n_coeffs_funcs, stbir__horizontal_gather_3_channels_with_n_coeffs_funcs, stbir__horizontal_gather_4_channels_with_n_coeffs_funcs, 0,0, stbir__horizontal_gather_7_channels_with_n_coeffs_funcs +}; + +static stbir__horizontal_gather_channels_func ** stbir__horizontal_gather_channels_funcs[8] = +{ + 0, stbir__horizontal_gather_1_channels_funcs, stbir__horizontal_gather_2_channels_funcs, stbir__horizontal_gather_3_channels_funcs, stbir__horizontal_gather_4_channels_funcs, 0,0, stbir__horizontal_gather_7_channels_funcs +}; + +// there are six resize classifications: 0 == vertical scatter, 1 == vertical gather < 1x scale, 2 == vertical gather 1x-2x scale, 4 == vertical gather < 3x scale, 4 == vertical gather > 3x scale, 5 == <=4 pixel height, 6 == <=4 pixel wide column +#define STBIR_RESIZE_CLASSIFICATIONS 8 + +static float stbir__compute_weights[5][STBIR_RESIZE_CLASSIFICATIONS][4]= // 5 = 0=1chan, 1=2chan, 2=3chan, 3=4chan, 4=7chan +{ + { + { 1.00000f, 1.00000f, 0.31250f, 1.00000f }, + { 0.56250f, 0.59375f, 0.00000f, 0.96875f }, + { 1.00000f, 0.06250f, 0.00000f, 1.00000f }, + { 0.00000f, 0.09375f, 1.00000f, 1.00000f }, + { 1.00000f, 1.00000f, 1.00000f, 1.00000f }, + { 0.03125f, 0.12500f, 1.00000f, 1.00000f }, + { 0.06250f, 0.12500f, 0.00000f, 1.00000f }, + { 0.00000f, 1.00000f, 0.00000f, 0.03125f }, + }, { + { 0.00000f, 0.84375f, 0.00000f, 0.03125f }, + { 0.09375f, 0.93750f, 0.00000f, 0.78125f }, + { 0.87500f, 0.21875f, 0.00000f, 0.96875f }, + { 0.09375f, 0.09375f, 1.00000f, 1.00000f }, + { 1.00000f, 1.00000f, 1.00000f, 1.00000f }, + { 0.03125f, 0.12500f, 1.00000f, 1.00000f }, + { 0.06250f, 0.12500f, 0.00000f, 1.00000f }, + { 0.00000f, 1.00000f, 0.00000f, 0.53125f }, + }, { + { 0.00000f, 0.53125f, 0.00000f, 0.03125f }, + { 0.06250f, 0.96875f, 0.00000f, 0.53125f }, + { 0.87500f, 0.18750f, 0.00000f, 0.93750f }, + { 0.00000f, 0.09375f, 1.00000f, 1.00000f }, + { 1.00000f, 1.00000f, 1.00000f, 1.00000f }, + { 0.03125f, 0.12500f, 1.00000f, 1.00000f }, + { 0.06250f, 0.12500f, 0.00000f, 1.00000f }, + { 0.00000f, 1.00000f, 0.00000f, 0.56250f }, + }, { + { 0.00000f, 0.50000f, 0.00000f, 0.71875f }, + { 0.06250f, 0.84375f, 0.00000f, 0.87500f }, + { 1.00000f, 0.50000f, 0.50000f, 0.96875f }, + { 1.00000f, 0.09375f, 0.31250f, 0.50000f }, + { 1.00000f, 1.00000f, 1.00000f, 1.00000f }, + { 1.00000f, 0.03125f, 0.03125f, 0.53125f }, + { 0.18750f, 0.12500f, 0.00000f, 1.00000f }, + { 0.00000f, 1.00000f, 0.03125f, 0.18750f }, + }, { + { 0.00000f, 0.59375f, 0.00000f, 0.96875f }, + { 0.06250f, 0.81250f, 0.06250f, 0.59375f }, + { 0.75000f, 0.43750f, 0.12500f, 0.96875f }, + { 0.87500f, 0.06250f, 0.18750f, 0.43750f }, + { 1.00000f, 1.00000f, 1.00000f, 1.00000f }, + { 0.15625f, 0.12500f, 1.00000f, 1.00000f }, + { 0.06250f, 0.12500f, 0.00000f, 1.00000f }, + { 0.00000f, 1.00000f, 0.03125f, 0.34375f }, + } +}; + +// structure that allow us to query and override info for training the costs +typedef struct STBIR__V_FIRST_INFO +{ + double v_cost, h_cost; + int control_v_first; // 0 = no control, 1 = force hori, 2 = force vert + int v_first; + int v_resize_classification; + int is_gather; +} STBIR__V_FIRST_INFO; + +#ifdef STBIR__V_FIRST_INFO_BUFFER +static STBIR__V_FIRST_INFO STBIR__V_FIRST_INFO_BUFFER = {0}; +#define STBIR__V_FIRST_INFO_POINTER &STBIR__V_FIRST_INFO_BUFFER +#else +#define STBIR__V_FIRST_INFO_POINTER 0 +#endif + +// Figure out whether to scale along the horizontal or vertical first. +// This only *super* important when you are scaling by a massively +// different amount in the vertical vs the horizontal (for example, if +// you are scaling by 2x in the width, and 0.5x in the height, then you +// want to do the vertical scale first, because it's around 3x faster +// in that order. +// +// In more normal circumstances, this makes a 20-40% differences, so +// it's good to get right, but not critical. The normal way that you +// decide which direction goes first is just figuring out which +// direction does more multiplies. But with modern CPUs with their +// fancy caches and SIMD and high IPC abilities, so there's just a lot +// more that goes into it. +// +// My handwavy sort of solution is to have an app that does a whole +// bunch of timing for both vertical and horizontal first modes, +// and then another app that can read lots of these timing files +// and try to search for the best weights to use. Dotimings.c +// is the app that does a bunch of timings, and vf_train.c is the +// app that solves for the best weights (and shows how well it +// does currently). + +static int stbir__should_do_vertical_first( float weights_table[STBIR_RESIZE_CLASSIFICATIONS][4], int horizontal_filter_pixel_width, float horizontal_scale, int horizontal_output_size, int vertical_filter_pixel_width, float vertical_scale, int vertical_output_size, int is_gather, STBIR__V_FIRST_INFO * info ) +{ + double v_cost, h_cost; + float * weights; + int vertical_first; + int v_classification; + + // categorize the resize into buckets + if ( ( vertical_output_size <= 4 ) || ( horizontal_output_size <= 4 ) ) + v_classification = ( vertical_output_size < horizontal_output_size ) ? 6 : 7; + else if ( vertical_scale <= 1.0f ) + v_classification = ( is_gather ) ? 1 : 0; + else if ( vertical_scale <= 2.0f) + v_classification = 2; + else if ( vertical_scale <= 3.0f) + v_classification = 3; + else if ( vertical_scale <= 4.0f) + v_classification = 5; + else + v_classification = 6; + + // use the right weights + weights = weights_table[ v_classification ]; + + // this is the costs when you don't take into account modern CPUs with high ipc and simd and caches - wish we had a better estimate + h_cost = (float)horizontal_filter_pixel_width * weights[0] + horizontal_scale * (float)vertical_filter_pixel_width * weights[1]; + v_cost = (float)vertical_filter_pixel_width * weights[2] + vertical_scale * (float)horizontal_filter_pixel_width * weights[3]; + + // use computation estimate to decide vertical first or not + vertical_first = ( v_cost <= h_cost ) ? 1 : 0; + + // save these, if requested + if ( info ) + { + info->h_cost = h_cost; + info->v_cost = v_cost; + info->v_resize_classification = v_classification; + info->v_first = vertical_first; + info->is_gather = is_gather; + } + + // and this allows us to override everything for testing (see dotiming.c) + if ( ( info ) && ( info->control_v_first ) ) + vertical_first = ( info->control_v_first == 2 ) ? 1 : 0; + + return vertical_first; +} + +// layout lookups - must match stbir_internal_pixel_layout +static unsigned char stbir__pixel_channels[] = { + 1,2,3,3,4, // 1ch, 2ch, rgb, bgr, 4ch + 4,4,4,4,2,2, // RGBA,BGRA,ARGB,ABGR,RA,AR + 4,4,4,4,2,2, // RGBA_PM,BGRA_PM,ARGB_PM,ABGR_PM,RA_PM,AR_PM +}; + +// the internal pixel layout enums are in a different order, so we can easily do range comparisons of types +// the public pixel layout is ordered in a way that if you cast num_channels (1-4) to the enum, you get something sensible +static stbir_internal_pixel_layout stbir__pixel_layout_convert_public_to_internal[] = { + STBIRI_BGR, STBIRI_1CHANNEL, STBIRI_2CHANNEL, STBIRI_RGB, STBIRI_RGBA, + STBIRI_4CHANNEL, STBIRI_BGRA, STBIRI_ARGB, STBIRI_ABGR, STBIRI_RA, STBIRI_AR, + STBIRI_RGBA_PM, STBIRI_BGRA_PM, STBIRI_ARGB_PM, STBIRI_ABGR_PM, STBIRI_RA_PM, STBIRI_AR_PM, +}; + +static stbir__info * stbir__alloc_internal_mem_and_build_samplers( stbir__sampler * horizontal, stbir__sampler * vertical, stbir__contributors * conservative, stbir_pixel_layout input_pixel_layout_public, stbir_pixel_layout output_pixel_layout_public, int splits, int new_x, int new_y, int fast_alpha, void * user_data STBIR_ONLY_PROFILE_BUILD_GET_INFO ) +{ + static char stbir_channel_count_index[8]={ 9,0,1,2, 3,9,9,4 }; + + stbir__info * info = 0; + void * alloced = 0; + size_t alloced_total = 0; + int vertical_first; + int decode_buffer_size, ring_buffer_length_bytes, ring_buffer_size, vertical_buffer_size, alloc_ring_buffer_num_entries; + + int alpha_weighting_type = 0; // 0=none, 1=simple, 2=fancy + int conservative_split_output_size = stbir__get_max_split( splits, vertical->scale_info.output_sub_size ); + stbir_internal_pixel_layout input_pixel_layout = stbir__pixel_layout_convert_public_to_internal[ input_pixel_layout_public ]; + stbir_internal_pixel_layout output_pixel_layout = stbir__pixel_layout_convert_public_to_internal[ output_pixel_layout_public ]; + int channels = stbir__pixel_channels[ input_pixel_layout ]; + int effective_channels = channels; + + // first figure out what type of alpha weighting to use (if any) + if ( ( horizontal->filter_enum != STBIR_FILTER_POINT_SAMPLE ) || ( vertical->filter_enum != STBIR_FILTER_POINT_SAMPLE ) ) // no alpha weighting on point sampling + { + if ( ( input_pixel_layout >= STBIRI_RGBA ) && ( input_pixel_layout <= STBIRI_AR ) && ( output_pixel_layout >= STBIRI_RGBA ) && ( output_pixel_layout <= STBIRI_AR ) ) + { + if ( fast_alpha ) + { + alpha_weighting_type = 4; + } + else + { + static int fancy_alpha_effective_cnts[6] = { 7, 7, 7, 7, 3, 3 }; + alpha_weighting_type = 2; + effective_channels = fancy_alpha_effective_cnts[ input_pixel_layout - STBIRI_RGBA ]; + } + } + else if ( ( input_pixel_layout >= STBIRI_RGBA_PM ) && ( input_pixel_layout <= STBIRI_AR_PM ) && ( output_pixel_layout >= STBIRI_RGBA ) && ( output_pixel_layout <= STBIRI_AR ) ) + { + // input premult, output non-premult + alpha_weighting_type = 3; + } + else if ( ( input_pixel_layout >= STBIRI_RGBA ) && ( input_pixel_layout <= STBIRI_AR ) && ( output_pixel_layout >= STBIRI_RGBA_PM ) && ( output_pixel_layout <= STBIRI_AR_PM ) ) + { + // input non-premult, output premult + alpha_weighting_type = 1; + } + } + + // channel in and out count must match currently + if ( channels != stbir__pixel_channels[ output_pixel_layout ] ) + return 0; + + // get vertical first + vertical_first = stbir__should_do_vertical_first( stbir__compute_weights[ (int)stbir_channel_count_index[ effective_channels ] ], horizontal->filter_pixel_width, horizontal->scale_info.scale, horizontal->scale_info.output_sub_size, vertical->filter_pixel_width, vertical->scale_info.scale, vertical->scale_info.output_sub_size, vertical->is_gather, STBIR__V_FIRST_INFO_POINTER ); + + // sometimes read one float off in some of the unrolled loops (with a weight of zero coeff, so it doesn't have an effect) + decode_buffer_size = ( conservative->n1 - conservative->n0 + 1 ) * effective_channels * sizeof(float) + sizeof(float); // extra float for padding + +#if defined( STBIR__SEPARATE_ALLOCATIONS ) && defined(STBIR_SIMD8) + if ( effective_channels == 3 ) + decode_buffer_size += sizeof(float); // avx in 3 channel mode needs one float at the start of the buffer (only with separate allocations) +#endif + + ring_buffer_length_bytes = horizontal->scale_info.output_sub_size * effective_channels * sizeof(float) + sizeof(float); // extra float for padding + + // if we do vertical first, the ring buffer holds a whole decoded line + if ( vertical_first ) + ring_buffer_length_bytes = ( decode_buffer_size + 15 ) & ~15; + + if ( ( ring_buffer_length_bytes & 4095 ) == 0 ) ring_buffer_length_bytes += 64*3; // avoid 4k alias + + // One extra entry because floating point precision problems sometimes cause an extra to be necessary. + alloc_ring_buffer_num_entries = vertical->filter_pixel_width + 1; + + // we never need more ring buffer entries than the scanlines we're outputting when in scatter mode + if ( ( !vertical->is_gather ) && ( alloc_ring_buffer_num_entries > conservative_split_output_size ) ) + alloc_ring_buffer_num_entries = conservative_split_output_size; + + ring_buffer_size = alloc_ring_buffer_num_entries * ring_buffer_length_bytes; + + // The vertical buffer is used differently, depending on whether we are scattering + // the vertical scanlines, or gathering them. + // If scattering, it's used at the temp buffer to accumulate each output. + // If gathering, it's just the output buffer. + vertical_buffer_size = horizontal->scale_info.output_sub_size * effective_channels * sizeof(float) + sizeof(float); // extra float for padding + + // we make two passes through this loop, 1st to add everything up, 2nd to allocate and init + for(;;) + { + int i; + void * advance_mem = alloced; + int copy_horizontal = 0; + stbir__sampler * possibly_use_horizontal_for_pivot = 0; + +#ifdef STBIR__SEPARATE_ALLOCATIONS + #define STBIR__NEXT_PTR( ptr, size, ntype ) if ( alloced ) { void * p = STBIR_MALLOC( size, user_data); if ( p == 0 ) { stbir__free_internal_mem( info ); return 0; } (ptr) = (ntype*)p; } +#else + #define STBIR__NEXT_PTR( ptr, size, ntype ) advance_mem = (void*) ( ( ((size_t)advance_mem) + 15 ) & ~15 ); if ( alloced ) ptr = (ntype*)advance_mem; advance_mem = ((char*)advance_mem) + (size); +#endif + + STBIR__NEXT_PTR( info, sizeof( stbir__info ), stbir__info ); + + STBIR__NEXT_PTR( info->split_info, sizeof( stbir__per_split_info ) * splits, stbir__per_split_info ); + + if ( info ) + { + static stbir__alpha_weight_func * fancy_alpha_weights[6] = { stbir__fancy_alpha_weight_4ch, stbir__fancy_alpha_weight_4ch, stbir__fancy_alpha_weight_4ch, stbir__fancy_alpha_weight_4ch, stbir__fancy_alpha_weight_2ch, stbir__fancy_alpha_weight_2ch }; + static stbir__alpha_unweight_func * fancy_alpha_unweights[6] = { stbir__fancy_alpha_unweight_4ch, stbir__fancy_alpha_unweight_4ch, stbir__fancy_alpha_unweight_4ch, stbir__fancy_alpha_unweight_4ch, stbir__fancy_alpha_unweight_2ch, stbir__fancy_alpha_unweight_2ch }; + static stbir__alpha_weight_func * simple_alpha_weights[6] = { stbir__simple_alpha_weight_4ch, stbir__simple_alpha_weight_4ch, stbir__simple_alpha_weight_4ch, stbir__simple_alpha_weight_4ch, stbir__simple_alpha_weight_2ch, stbir__simple_alpha_weight_2ch }; + static stbir__alpha_unweight_func * simple_alpha_unweights[6] = { stbir__simple_alpha_unweight_4ch, stbir__simple_alpha_unweight_4ch, stbir__simple_alpha_unweight_4ch, stbir__simple_alpha_unweight_4ch, stbir__simple_alpha_unweight_2ch, stbir__simple_alpha_unweight_2ch }; + + // initialize info fields + info->alloced_mem = alloced; + info->alloced_total = alloced_total; + + info->channels = channels; + info->effective_channels = effective_channels; + + info->offset_x = new_x; + info->offset_y = new_y; + info->alloc_ring_buffer_num_entries = alloc_ring_buffer_num_entries; + info->ring_buffer_num_entries = 0; + info->ring_buffer_length_bytes = ring_buffer_length_bytes; + info->splits = splits; + info->vertical_first = vertical_first; + + info->input_pixel_layout_internal = input_pixel_layout; + info->output_pixel_layout_internal = output_pixel_layout; + + // setup alpha weight functions + info->alpha_weight = 0; + info->alpha_unweight = 0; + + // handle alpha weighting functions and overrides + if ( alpha_weighting_type == 2 ) + { + // high quality alpha multiplying on the way in, dividing on the way out + info->alpha_weight = fancy_alpha_weights[ input_pixel_layout - STBIRI_RGBA ]; + info->alpha_unweight = fancy_alpha_unweights[ output_pixel_layout - STBIRI_RGBA ]; + } + else if ( alpha_weighting_type == 4 ) + { + // fast alpha multiplying on the way in, dividing on the way out + info->alpha_weight = simple_alpha_weights[ input_pixel_layout - STBIRI_RGBA ]; + info->alpha_unweight = simple_alpha_unweights[ output_pixel_layout - STBIRI_RGBA ]; + } + else if ( alpha_weighting_type == 1 ) + { + // fast alpha on the way in, leave in premultiplied form on way out + info->alpha_weight = simple_alpha_weights[ input_pixel_layout - STBIRI_RGBA ]; + } + else if ( alpha_weighting_type == 3 ) + { + // incoming is premultiplied, fast alpha dividing on the way out - non-premultiplied output + info->alpha_unweight = simple_alpha_unweights[ output_pixel_layout - STBIRI_RGBA ]; + } + + // handle 3-chan color flipping, using the alpha weight path + if ( ( ( input_pixel_layout == STBIRI_RGB ) && ( output_pixel_layout == STBIRI_BGR ) ) || + ( ( input_pixel_layout == STBIRI_BGR ) && ( output_pixel_layout == STBIRI_RGB ) ) ) + { + // do the flipping on the smaller of the two ends + if ( horizontal->scale_info.scale < 1.0f ) + info->alpha_unweight = stbir__simple_flip_3ch; + else + info->alpha_weight = stbir__simple_flip_3ch; + } + + } + + // get all the per-split buffers + for( i = 0 ; i < splits ; i++ ) + { + STBIR__NEXT_PTR( info->split_info[i].decode_buffer, decode_buffer_size, float ); + +#ifdef STBIR__SEPARATE_ALLOCATIONS + + #ifdef STBIR_SIMD8 + if ( ( info ) && ( effective_channels == 3 ) ) + ++info->split_info[i].decode_buffer; // avx in 3 channel mode needs one float at the start of the buffer + #endif + + STBIR__NEXT_PTR( info->split_info[i].ring_buffers, alloc_ring_buffer_num_entries * sizeof(float*), float* ); + { + int j; + for( j = 0 ; j < alloc_ring_buffer_num_entries ; j++ ) + { + STBIR__NEXT_PTR( info->split_info[i].ring_buffers[j], ring_buffer_length_bytes, float ); + #ifdef STBIR_SIMD8 + if ( ( info ) && ( effective_channels == 3 ) ) + ++info->split_info[i].ring_buffers[j]; // avx in 3 channel mode needs one float at the start of the buffer + #endif + } + } +#else + STBIR__NEXT_PTR( info->split_info[i].ring_buffer, ring_buffer_size, float ); +#endif + STBIR__NEXT_PTR( info->split_info[i].vertical_buffer, vertical_buffer_size, float ); + } + + // alloc memory for to-be-pivoted coeffs (if necessary) + if ( vertical->is_gather == 0 ) + { + int both; + int temp_mem_amt; + + // when in vertical scatter mode, we first build the coefficients in gather mode, and then pivot after, + // that means we need two buffers, so we try to use the decode buffer and ring buffer for this. if that + // is too small, we just allocate extra memory to use as this temp. + + both = vertical->gather_prescatter_contributors_size + vertical->gather_prescatter_coefficients_size; + +#ifdef STBIR__SEPARATE_ALLOCATIONS + temp_mem_amt = decode_buffer_size; + + #ifdef STBIR_SIMD8 + if ( effective_channels == 3 ) + --temp_mem_amt; // avx in 3 channel mode needs one float at the start of the buffer + #endif +#else + temp_mem_amt = ( decode_buffer_size + ring_buffer_size + vertical_buffer_size ) * splits; +#endif + if ( temp_mem_amt >= both ) + { + if ( info ) + { + vertical->gather_prescatter_contributors = (stbir__contributors*)info->split_info[0].decode_buffer; + vertical->gather_prescatter_coefficients = (float*) ( ( (char*)info->split_info[0].decode_buffer ) + vertical->gather_prescatter_contributors_size ); + } + } + else + { + // ring+decode memory is too small, so allocate temp memory + STBIR__NEXT_PTR( vertical->gather_prescatter_contributors, vertical->gather_prescatter_contributors_size, stbir__contributors ); + STBIR__NEXT_PTR( vertical->gather_prescatter_coefficients, vertical->gather_prescatter_coefficients_size, float ); + } + } + + STBIR__NEXT_PTR( horizontal->contributors, horizontal->contributors_size, stbir__contributors ); + STBIR__NEXT_PTR( horizontal->coefficients, horizontal->coefficients_size, float ); + + // are the two filters identical?? (happens a lot with mipmap generation) + if ( ( horizontal->filter_kernel == vertical->filter_kernel ) && ( horizontal->filter_support == vertical->filter_support ) && ( horizontal->edge == vertical->edge ) && ( horizontal->scale_info.output_sub_size == vertical->scale_info.output_sub_size ) ) + { + float diff_scale = horizontal->scale_info.scale - vertical->scale_info.scale; + float diff_shift = horizontal->scale_info.pixel_shift - vertical->scale_info.pixel_shift; + if ( diff_scale < 0.0f ) diff_scale = -diff_scale; + if ( diff_shift < 0.0f ) diff_shift = -diff_shift; + if ( ( diff_scale <= stbir__small_float ) && ( diff_shift <= stbir__small_float ) ) + { + if ( horizontal->is_gather == vertical->is_gather ) + { + copy_horizontal = 1; + goto no_vert_alloc; + } + // everything matches, but vertical is scatter, horizontal is gather, use horizontal coeffs for vertical pivot coeffs + possibly_use_horizontal_for_pivot = horizontal; + } + } + + STBIR__NEXT_PTR( vertical->contributors, vertical->contributors_size, stbir__contributors ); + STBIR__NEXT_PTR( vertical->coefficients, vertical->coefficients_size, float ); + + no_vert_alloc: + + if ( info ) + { + STBIR_PROFILE_BUILD_START( horizontal ); + + stbir__calculate_filters( horizontal, 0, user_data STBIR_ONLY_PROFILE_BUILD_SET_INFO ); + + // setup the horizontal gather functions + // start with defaulting to the n_coeffs functions (specialized on channels and remnant leftover) + info->horizontal_gather_channels = stbir__horizontal_gather_n_coeffs_funcs[ effective_channels ][ horizontal->extent_info.widest & 3 ]; + // but if the number of coeffs <= 12, use another set of special cases. <=12 coeffs is any enlarging resize, or shrinking resize down to about 1/3 size + if ( horizontal->extent_info.widest <= 12 ) + info->horizontal_gather_channels = stbir__horizontal_gather_channels_funcs[ effective_channels ][ horizontal->extent_info.widest - 1 ]; + + info->scanline_extents.conservative.n0 = conservative->n0; + info->scanline_extents.conservative.n1 = conservative->n1; + + // get exact extents + stbir__get_extents( horizontal, &info->scanline_extents ); + + // pack the horizontal coeffs + horizontal->coefficient_width = stbir__pack_coefficients(horizontal->num_contributors, horizontal->contributors, horizontal->coefficients, horizontal->coefficient_width, horizontal->extent_info.widest, info->scanline_extents.conservative.n0, info->scanline_extents.conservative.n1 ); + + STBIR_MEMCPY( &info->horizontal, horizontal, sizeof( stbir__sampler ) ); + + STBIR_PROFILE_BUILD_END( horizontal ); + + if ( copy_horizontal ) + { + STBIR_MEMCPY( &info->vertical, horizontal, sizeof( stbir__sampler ) ); + } + else + { + STBIR_PROFILE_BUILD_START( vertical ); + + stbir__calculate_filters( vertical, possibly_use_horizontal_for_pivot, user_data STBIR_ONLY_PROFILE_BUILD_SET_INFO ); + STBIR_MEMCPY( &info->vertical, vertical, sizeof( stbir__sampler ) ); + + STBIR_PROFILE_BUILD_END( vertical ); + } + + // setup the vertical split ranges + stbir__get_split_info( info->split_info, info->splits, info->vertical.scale_info.output_sub_size, info->vertical.filter_pixel_margin, info->vertical.scale_info.input_full_size ); + + // now we know precisely how many entries we need + info->ring_buffer_num_entries = info->vertical.extent_info.widest; + + // we never need more ring buffer entries than the scanlines we're outputting + if ( ( !info->vertical.is_gather ) && ( info->ring_buffer_num_entries > conservative_split_output_size ) ) + info->ring_buffer_num_entries = conservative_split_output_size; + STBIR_ASSERT( info->ring_buffer_num_entries <= info->alloc_ring_buffer_num_entries ); + + // a few of the horizontal gather functions read past the end of the decode (but mask it out), + // so put in normal values so no snans or denormals accidentally sneak in (also, in the ring + // buffer for vertical first) + for( i = 0 ; i < splits ; i++ ) + { + int t, ofs, start; + + ofs = decode_buffer_size / 4; + + #if defined( STBIR__SEPARATE_ALLOCATIONS ) && defined(STBIR_SIMD8) + if ( effective_channels == 3 ) + --ofs; // avx in 3 channel mode needs one float at the start of the buffer, so we snap back for clearing + #endif + + start = ofs - 4; + if ( start < 0 ) start = 0; + + for( t = start ; t < ofs; t++ ) + info->split_info[i].decode_buffer[ t ] = 9999.0f; + + if ( vertical_first ) + { + int j; + for( j = 0; j < info->ring_buffer_num_entries ; j++ ) + { + for( t = start ; t < ofs; t++ ) + stbir__get_ring_buffer_entry( info, info->split_info + i, j )[ t ] = 9999.0f; + } + } + } + } + + #undef STBIR__NEXT_PTR + + + // is this the first time through loop? + if ( info == 0 ) + { + alloced_total = ( 15 + (size_t)advance_mem ); + alloced = STBIR_MALLOC( alloced_total, user_data ); + if ( alloced == 0 ) + return 0; + } + else + return info; // success + } +} + +static int stbir__perform_resize( stbir__info const * info, int split_start, int split_count ) +{ + stbir__per_split_info * split_info = info->split_info + split_start; + + STBIR_PROFILE_CLEAR_EXTRAS(); + + STBIR_PROFILE_FIRST_START( looping ); + if (info->vertical.is_gather) + stbir__vertical_gather_loop( info, split_info, split_count ); + else + stbir__vertical_scatter_loop( info, split_info, split_count ); + STBIR_PROFILE_END( looping ); + + return 1; +} + +static void stbir__update_info_from_resize( stbir__info * info, STBIR_RESIZE * resize ) +{ + static stbir__decode_pixels_func * decode_simple[STBIR_TYPE_HALF_FLOAT-STBIR_TYPE_UINT8_SRGB+1]= + { + /* 1ch-4ch */ stbir__decode_uint8_srgb, stbir__decode_uint8_srgb, 0, stbir__decode_float_linear, stbir__decode_half_float_linear, + }; + + static stbir__decode_pixels_func * decode_alphas[STBIRI_AR-STBIRI_RGBA+1][STBIR_TYPE_HALF_FLOAT-STBIR_TYPE_UINT8_SRGB+1]= + { + { /* RGBA */ stbir__decode_uint8_srgb4_linearalpha, stbir__decode_uint8_srgb, 0, stbir__decode_float_linear, stbir__decode_half_float_linear }, + { /* BGRA */ stbir__decode_uint8_srgb4_linearalpha_BGRA, stbir__decode_uint8_srgb_BGRA, 0, stbir__decode_float_linear_BGRA, stbir__decode_half_float_linear_BGRA }, + { /* ARGB */ stbir__decode_uint8_srgb4_linearalpha_ARGB, stbir__decode_uint8_srgb_ARGB, 0, stbir__decode_float_linear_ARGB, stbir__decode_half_float_linear_ARGB }, + { /* ABGR */ stbir__decode_uint8_srgb4_linearalpha_ABGR, stbir__decode_uint8_srgb_ABGR, 0, stbir__decode_float_linear_ABGR, stbir__decode_half_float_linear_ABGR }, + { /* RA */ stbir__decode_uint8_srgb2_linearalpha, stbir__decode_uint8_srgb, 0, stbir__decode_float_linear, stbir__decode_half_float_linear }, + { /* AR */ stbir__decode_uint8_srgb2_linearalpha_AR, stbir__decode_uint8_srgb_AR, 0, stbir__decode_float_linear_AR, stbir__decode_half_float_linear_AR }, + }; + + static stbir__decode_pixels_func * decode_simple_scaled_or_not[2][2]= + { + { stbir__decode_uint8_linear_scaled, stbir__decode_uint8_linear }, { stbir__decode_uint16_linear_scaled, stbir__decode_uint16_linear }, + }; + + static stbir__decode_pixels_func * decode_alphas_scaled_or_not[STBIRI_AR-STBIRI_RGBA+1][2][2]= + { + { /* RGBA */ { stbir__decode_uint8_linear_scaled, stbir__decode_uint8_linear }, { stbir__decode_uint16_linear_scaled, stbir__decode_uint16_linear } }, + { /* BGRA */ { stbir__decode_uint8_linear_scaled_BGRA, stbir__decode_uint8_linear_BGRA }, { stbir__decode_uint16_linear_scaled_BGRA, stbir__decode_uint16_linear_BGRA } }, + { /* ARGB */ { stbir__decode_uint8_linear_scaled_ARGB, stbir__decode_uint8_linear_ARGB }, { stbir__decode_uint16_linear_scaled_ARGB, stbir__decode_uint16_linear_ARGB } }, + { /* ABGR */ { stbir__decode_uint8_linear_scaled_ABGR, stbir__decode_uint8_linear_ABGR }, { stbir__decode_uint16_linear_scaled_ABGR, stbir__decode_uint16_linear_ABGR } }, + { /* RA */ { stbir__decode_uint8_linear_scaled, stbir__decode_uint8_linear }, { stbir__decode_uint16_linear_scaled, stbir__decode_uint16_linear } }, + { /* AR */ { stbir__decode_uint8_linear_scaled_AR, stbir__decode_uint8_linear_AR }, { stbir__decode_uint16_linear_scaled_AR, stbir__decode_uint16_linear_AR } } + }; + + static stbir__encode_pixels_func * encode_simple[STBIR_TYPE_HALF_FLOAT-STBIR_TYPE_UINT8_SRGB+1]= + { + /* 1ch-4ch */ stbir__encode_uint8_srgb, stbir__encode_uint8_srgb, 0, stbir__encode_float_linear, stbir__encode_half_float_linear, + }; + + static stbir__encode_pixels_func * encode_alphas[STBIRI_AR-STBIRI_RGBA+1][STBIR_TYPE_HALF_FLOAT-STBIR_TYPE_UINT8_SRGB+1]= + { + { /* RGBA */ stbir__encode_uint8_srgb4_linearalpha, stbir__encode_uint8_srgb, 0, stbir__encode_float_linear, stbir__encode_half_float_linear }, + { /* BGRA */ stbir__encode_uint8_srgb4_linearalpha_BGRA, stbir__encode_uint8_srgb_BGRA, 0, stbir__encode_float_linear_BGRA, stbir__encode_half_float_linear_BGRA }, + { /* ARGB */ stbir__encode_uint8_srgb4_linearalpha_ARGB, stbir__encode_uint8_srgb_ARGB, 0, stbir__encode_float_linear_ARGB, stbir__encode_half_float_linear_ARGB }, + { /* ABGR */ stbir__encode_uint8_srgb4_linearalpha_ABGR, stbir__encode_uint8_srgb_ABGR, 0, stbir__encode_float_linear_ABGR, stbir__encode_half_float_linear_ABGR }, + { /* RA */ stbir__encode_uint8_srgb2_linearalpha, stbir__encode_uint8_srgb, 0, stbir__encode_float_linear, stbir__encode_half_float_linear }, + { /* AR */ stbir__encode_uint8_srgb2_linearalpha_AR, stbir__encode_uint8_srgb_AR, 0, stbir__encode_float_linear_AR, stbir__encode_half_float_linear_AR } + }; + + static stbir__encode_pixels_func * encode_simple_scaled_or_not[2][2]= + { + { stbir__encode_uint8_linear_scaled, stbir__encode_uint8_linear }, { stbir__encode_uint16_linear_scaled, stbir__encode_uint16_linear }, + }; + + static stbir__encode_pixels_func * encode_alphas_scaled_or_not[STBIRI_AR-STBIRI_RGBA+1][2][2]= + { + { /* RGBA */ { stbir__encode_uint8_linear_scaled, stbir__encode_uint8_linear }, { stbir__encode_uint16_linear_scaled, stbir__encode_uint16_linear } }, + { /* BGRA */ { stbir__encode_uint8_linear_scaled_BGRA, stbir__encode_uint8_linear_BGRA }, { stbir__encode_uint16_linear_scaled_BGRA, stbir__encode_uint16_linear_BGRA } }, + { /* ARGB */ { stbir__encode_uint8_linear_scaled_ARGB, stbir__encode_uint8_linear_ARGB }, { stbir__encode_uint16_linear_scaled_ARGB, stbir__encode_uint16_linear_ARGB } }, + { /* ABGR */ { stbir__encode_uint8_linear_scaled_ABGR, stbir__encode_uint8_linear_ABGR }, { stbir__encode_uint16_linear_scaled_ABGR, stbir__encode_uint16_linear_ABGR } }, + { /* RA */ { stbir__encode_uint8_linear_scaled, stbir__encode_uint8_linear }, { stbir__encode_uint16_linear_scaled, stbir__encode_uint16_linear } }, + { /* AR */ { stbir__encode_uint8_linear_scaled_AR, stbir__encode_uint8_linear_AR }, { stbir__encode_uint16_linear_scaled_AR, stbir__encode_uint16_linear_AR } } + }; + + stbir__decode_pixels_func * decode_pixels = 0; + stbir__encode_pixels_func * encode_pixels = 0; + stbir_datatype input_type, output_type; + + input_type = resize->input_data_type; + output_type = resize->output_data_type; + info->input_data = resize->input_pixels; + info->input_stride_bytes = resize->input_stride_in_bytes; + info->output_stride_bytes = resize->output_stride_in_bytes; + + // if we're completely point sampling, then we can turn off SRGB + if ( ( info->horizontal.filter_enum == STBIR_FILTER_POINT_SAMPLE ) && ( info->vertical.filter_enum == STBIR_FILTER_POINT_SAMPLE ) ) + { + if ( ( ( input_type == STBIR_TYPE_UINT8_SRGB ) || ( input_type == STBIR_TYPE_UINT8_SRGB_ALPHA ) ) && + ( ( output_type == STBIR_TYPE_UINT8_SRGB ) || ( output_type == STBIR_TYPE_UINT8_SRGB_ALPHA ) ) ) + { + input_type = STBIR_TYPE_UINT8; + output_type = STBIR_TYPE_UINT8; + } + } + + // recalc the output and input strides + if ( info->input_stride_bytes == 0 ) + info->input_stride_bytes = info->channels * info->horizontal.scale_info.input_full_size * stbir__type_size[input_type]; + + if ( info->output_stride_bytes == 0 ) + info->output_stride_bytes = info->channels * info->horizontal.scale_info.output_sub_size * stbir__type_size[output_type]; + + // calc offset + info->output_data = ( (char*) resize->output_pixels ) + ( (size_t) info->offset_y * (size_t) resize->output_stride_in_bytes ) + ( info->offset_x * info->channels * stbir__type_size[output_type] ); + + info->in_pixels_cb = resize->input_cb; + info->user_data = resize->user_data; + info->out_pixels_cb = resize->output_cb; + + // setup the input format converters + if ( ( input_type == STBIR_TYPE_UINT8 ) || ( input_type == STBIR_TYPE_UINT16 ) ) + { + int non_scaled = 0; + + // check if we can run unscaled - 0-255.0/0-65535.0 instead of 0-1.0 (which is a tiny bit faster when doing linear 8->8 or 16->16) + if ( ( !info->alpha_weight ) && ( !info->alpha_unweight ) ) // don't short circuit when alpha weighting (get everything to 0-1.0 as usual) + if ( ( ( input_type == STBIR_TYPE_UINT8 ) && ( output_type == STBIR_TYPE_UINT8 ) ) || ( ( input_type == STBIR_TYPE_UINT16 ) && ( output_type == STBIR_TYPE_UINT16 ) ) ) + non_scaled = 1; + + if ( info->input_pixel_layout_internal <= STBIRI_4CHANNEL ) + decode_pixels = decode_simple_scaled_or_not[ input_type == STBIR_TYPE_UINT16 ][ non_scaled ]; + else + decode_pixels = decode_alphas_scaled_or_not[ ( info->input_pixel_layout_internal - STBIRI_RGBA ) % ( STBIRI_AR-STBIRI_RGBA+1 ) ][ input_type == STBIR_TYPE_UINT16 ][ non_scaled ]; + } + else + { + if ( info->input_pixel_layout_internal <= STBIRI_4CHANNEL ) + decode_pixels = decode_simple[ input_type - STBIR_TYPE_UINT8_SRGB ]; + else + decode_pixels = decode_alphas[ ( info->input_pixel_layout_internal - STBIRI_RGBA ) % ( STBIRI_AR-STBIRI_RGBA+1 ) ][ input_type - STBIR_TYPE_UINT8_SRGB ]; + } + + // setup the output format converters + if ( ( output_type == STBIR_TYPE_UINT8 ) || ( output_type == STBIR_TYPE_UINT16 ) ) + { + int non_scaled = 0; + + // check if we can run unscaled - 0-255.0/0-65535.0 instead of 0-1.0 (which is a tiny bit faster when doing linear 8->8 or 16->16) + if ( ( !info->alpha_weight ) && ( !info->alpha_unweight ) ) // don't short circuit when alpha weighting (get everything to 0-1.0 as usual) + if ( ( ( input_type == STBIR_TYPE_UINT8 ) && ( output_type == STBIR_TYPE_UINT8 ) ) || ( ( input_type == STBIR_TYPE_UINT16 ) && ( output_type == STBIR_TYPE_UINT16 ) ) ) + non_scaled = 1; + + if ( info->output_pixel_layout_internal <= STBIRI_4CHANNEL ) + encode_pixels = encode_simple_scaled_or_not[ output_type == STBIR_TYPE_UINT16 ][ non_scaled ]; + else + encode_pixels = encode_alphas_scaled_or_not[ ( info->output_pixel_layout_internal - STBIRI_RGBA ) % ( STBIRI_AR-STBIRI_RGBA+1 ) ][ output_type == STBIR_TYPE_UINT16 ][ non_scaled ]; + } + else + { + if ( info->output_pixel_layout_internal <= STBIRI_4CHANNEL ) + encode_pixels = encode_simple[ output_type - STBIR_TYPE_UINT8_SRGB ]; + else + encode_pixels = encode_alphas[ ( info->output_pixel_layout_internal - STBIRI_RGBA ) % ( STBIRI_AR-STBIRI_RGBA+1 ) ][ output_type - STBIR_TYPE_UINT8_SRGB ]; + } + + info->input_type = input_type; + info->output_type = output_type; + info->decode_pixels = decode_pixels; + info->encode_pixels = encode_pixels; +} + +static void stbir__clip( int * outx, int * outsubw, int outw, double * u0, double * u1 ) +{ + double per, adj; + int over; + + // do left/top edge + if ( *outx < 0 ) + { + per = ( (double)*outx ) / ( (double)*outsubw ); // is negative + adj = per * ( *u1 - *u0 ); + *u0 -= adj; // increases u0 + *outx = 0; + } + + // do right/bot edge + over = outw - ( *outx + *outsubw ); + if ( over < 0 ) + { + per = ( (double)over ) / ( (double)*outsubw ); // is negative + adj = per * ( *u1 - *u0 ); + *u1 += adj; // decrease u1 + *outsubw = outw - *outx; + } +} + +// converts a double to a rational that has less than one float bit of error (returns 0 if unable to do so) +static int stbir__double_to_rational(double f, stbir_uint32 limit, stbir_uint32 *numer, stbir_uint32 *denom, int limit_denom ) // limit_denom (1) or limit numer (0) +{ + double err; + stbir_uint64 top, bot; + stbir_uint64 numer_last = 0; + stbir_uint64 denom_last = 1; + stbir_uint64 numer_estimate = 1; + stbir_uint64 denom_estimate = 0; + + // scale to past float error range + top = (stbir_uint64)( f * (double)(1 << 25) ); + bot = 1 << 25; + + // keep refining, but usually stops in a few loops - usually 5 for bad cases + for(;;) + { + stbir_uint64 est, temp; + + // hit limit, break out and do best full range estimate + if ( ( ( limit_denom ) ? denom_estimate : numer_estimate ) >= limit ) + break; + + // is the current error less than 1 bit of a float? if so, we're done + if ( denom_estimate ) + { + err = ( (double)numer_estimate / (double)denom_estimate ) - f; + if ( err < 0.0 ) err = -err; + if ( err < ( 1.0 / (double)(1<<24) ) ) + { + // yup, found it + *numer = (stbir_uint32) numer_estimate; + *denom = (stbir_uint32) denom_estimate; + return 1; + } + } + + // no more refinement bits left? break out and do full range estimate + if ( bot == 0 ) + break; + + // gcd the estimate bits + est = top / bot; + temp = top % bot; + top = bot; + bot = temp; + + // move remainders + temp = est * denom_estimate + denom_last; + denom_last = denom_estimate; + denom_estimate = temp; + + // move remainders + temp = est * numer_estimate + numer_last; + numer_last = numer_estimate; + numer_estimate = temp; + } + + // we didn't fine anything good enough for float, use a full range estimate + if ( limit_denom ) + { + numer_estimate= (stbir_uint64)( f * (double)limit + 0.5 ); + denom_estimate = limit; + } + else + { + numer_estimate = limit; + denom_estimate = (stbir_uint64)( ( (double)limit / f ) + 0.5 ); + } + + *numer = (stbir_uint32) numer_estimate; + *denom = (stbir_uint32) denom_estimate; + + err = ( denom_estimate ) ? ( ( (double)(stbir_uint32)numer_estimate / (double)(stbir_uint32)denom_estimate ) - f ) : 1.0; + if ( err < 0.0 ) err = -err; + return ( err < ( 1.0 / (double)(1<<24) ) ) ? 1 : 0; +} + +static int stbir__calculate_region_transform( stbir__scale_info * scale_info, int output_full_range, int * output_offset, int output_sub_range, int input_full_range, double input_s0, double input_s1 ) +{ + double output_range, input_range, output_s, input_s, ratio, scale; + + input_s = input_s1 - input_s0; + + // null area + if ( ( output_full_range == 0 ) || ( input_full_range == 0 ) || + ( output_sub_range == 0 ) || ( input_s <= stbir__small_float ) ) + return 0; + + // are either of the ranges completely out of bounds? + if ( ( *output_offset >= output_full_range ) || ( ( *output_offset + output_sub_range ) <= 0 ) || ( input_s0 >= (1.0f-stbir__small_float) ) || ( input_s1 <= stbir__small_float ) ) + return 0; + + output_range = (double)output_full_range; + input_range = (double)input_full_range; + + output_s = ( (double)output_sub_range) / output_range; + + // figure out the scaling to use + ratio = output_s / input_s; + + // save scale before clipping + scale = ( output_range / input_range ) * ratio; + scale_info->scale = (float)scale; + scale_info->inv_scale = (float)( 1.0 / scale ); + + // clip output area to left/right output edges (and adjust input area) + stbir__clip( output_offset, &output_sub_range, output_full_range, &input_s0, &input_s1 ); + + // recalc input area + input_s = input_s1 - input_s0; + + // after clipping do we have zero input area? + if ( input_s <= stbir__small_float ) + return 0; + + // calculate and store the starting source offsets in output pixel space + scale_info->pixel_shift = (float) ( input_s0 * ratio * output_range ); + + scale_info->scale_is_rational = stbir__double_to_rational( scale, ( scale <= 1.0 ) ? output_full_range : input_full_range, &scale_info->scale_numerator, &scale_info->scale_denominator, ( scale >= 1.0 ) ); + + scale_info->input_full_size = input_full_range; + scale_info->output_sub_size = output_sub_range; + + return 1; +} + + +static void stbir__init_and_set_layout( STBIR_RESIZE * resize, stbir_pixel_layout pixel_layout, stbir_datatype data_type ) +{ + resize->input_cb = 0; + resize->output_cb = 0; + resize->user_data = resize; + resize->samplers = 0; + resize->called_alloc = 0; + resize->horizontal_filter = STBIR_FILTER_DEFAULT; + resize->horizontal_filter_kernel = 0; resize->horizontal_filter_support = 0; + resize->vertical_filter = STBIR_FILTER_DEFAULT; + resize->vertical_filter_kernel = 0; resize->vertical_filter_support = 0; + resize->horizontal_edge = STBIR_EDGE_CLAMP; + resize->vertical_edge = STBIR_EDGE_CLAMP; + resize->input_s0 = 0; resize->input_t0 = 0; resize->input_s1 = 1; resize->input_t1 = 1; + resize->output_subx = 0; resize->output_suby = 0; resize->output_subw = resize->output_w; resize->output_subh = resize->output_h; + resize->input_data_type = data_type; + resize->output_data_type = data_type; + resize->input_pixel_layout_public = pixel_layout; + resize->output_pixel_layout_public = pixel_layout; + resize->needs_rebuild = 1; +} + +STBIRDEF void stbir_resize_init( STBIR_RESIZE * resize, + const void *input_pixels, int input_w, int input_h, int input_stride_in_bytes, // stride can be zero + void *output_pixels, int output_w, int output_h, int output_stride_in_bytes, // stride can be zero + stbir_pixel_layout pixel_layout, stbir_datatype data_type ) +{ + resize->input_pixels = input_pixels; + resize->input_w = input_w; + resize->input_h = input_h; + resize->input_stride_in_bytes = input_stride_in_bytes; + resize->output_pixels = output_pixels; + resize->output_w = output_w; + resize->output_h = output_h; + resize->output_stride_in_bytes = output_stride_in_bytes; + resize->fast_alpha = 0; + + stbir__init_and_set_layout( resize, pixel_layout, data_type ); +} + +// You can update parameters any time after resize_init +STBIRDEF void stbir_set_datatypes( STBIR_RESIZE * resize, stbir_datatype input_type, stbir_datatype output_type ) // by default, datatype from resize_init +{ + resize->input_data_type = input_type; + resize->output_data_type = output_type; + if ( ( resize->samplers ) && ( !resize->needs_rebuild ) ) + stbir__update_info_from_resize( resize->samplers, resize ); +} + +STBIRDEF void stbir_set_pixel_callbacks( STBIR_RESIZE * resize, stbir_input_callback * input_cb, stbir_output_callback * output_cb ) // no callbacks by default +{ + resize->input_cb = input_cb; + resize->output_cb = output_cb; + + if ( ( resize->samplers ) && ( !resize->needs_rebuild ) ) + { + resize->samplers->in_pixels_cb = input_cb; + resize->samplers->out_pixels_cb = output_cb; + } +} + +STBIRDEF void stbir_set_user_data( STBIR_RESIZE * resize, void * user_data ) // pass back STBIR_RESIZE* by default +{ + resize->user_data = user_data; + if ( ( resize->samplers ) && ( !resize->needs_rebuild ) ) + resize->samplers->user_data = user_data; +} + +STBIRDEF void stbir_set_buffer_ptrs( STBIR_RESIZE * resize, const void * input_pixels, int input_stride_in_bytes, void * output_pixels, int output_stride_in_bytes ) +{ + resize->input_pixels = input_pixels; + resize->input_stride_in_bytes = input_stride_in_bytes; + resize->output_pixels = output_pixels; + resize->output_stride_in_bytes = output_stride_in_bytes; + if ( ( resize->samplers ) && ( !resize->needs_rebuild ) ) + stbir__update_info_from_resize( resize->samplers, resize ); +} + + +STBIRDEF int stbir_set_edgemodes( STBIR_RESIZE * resize, stbir_edge horizontal_edge, stbir_edge vertical_edge ) // CLAMP by default +{ + resize->horizontal_edge = horizontal_edge; + resize->vertical_edge = vertical_edge; + resize->needs_rebuild = 1; + return 1; +} + +STBIRDEF int stbir_set_filters( STBIR_RESIZE * resize, stbir_filter horizontal_filter, stbir_filter vertical_filter ) // STBIR_DEFAULT_FILTER_UPSAMPLE/DOWNSAMPLE by default +{ + resize->horizontal_filter = horizontal_filter; + resize->vertical_filter = vertical_filter; + resize->needs_rebuild = 1; + return 1; +} + +STBIRDEF int stbir_set_filter_callbacks( STBIR_RESIZE * resize, stbir__kernel_callback * horizontal_filter, stbir__support_callback * horizontal_support, stbir__kernel_callback * vertical_filter, stbir__support_callback * vertical_support ) +{ + resize->horizontal_filter_kernel = horizontal_filter; resize->horizontal_filter_support = horizontal_support; + resize->vertical_filter_kernel = vertical_filter; resize->vertical_filter_support = vertical_support; + resize->needs_rebuild = 1; + return 1; +} + +STBIRDEF int stbir_set_pixel_layouts( STBIR_RESIZE * resize, stbir_pixel_layout input_pixel_layout, stbir_pixel_layout output_pixel_layout ) // sets new pixel layouts +{ + resize->input_pixel_layout_public = input_pixel_layout; + resize->output_pixel_layout_public = output_pixel_layout; + resize->needs_rebuild = 1; + return 1; +} + + +STBIRDEF int stbir_set_non_pm_alpha_speed_over_quality( STBIR_RESIZE * resize, int non_pma_alpha_speed_over_quality ) // sets alpha speed +{ + resize->fast_alpha = non_pma_alpha_speed_over_quality; + resize->needs_rebuild = 1; + return 1; +} + +STBIRDEF int stbir_set_input_subrect( STBIR_RESIZE * resize, double s0, double t0, double s1, double t1 ) // sets input region (full region by default) +{ + resize->input_s0 = s0; + resize->input_t0 = t0; + resize->input_s1 = s1; + resize->input_t1 = t1; + resize->needs_rebuild = 1; + + // are we inbounds? + if ( ( s1 < stbir__small_float ) || ( (s1-s0) < stbir__small_float ) || + ( t1 < stbir__small_float ) || ( (t1-t0) < stbir__small_float ) || + ( s0 > (1.0f-stbir__small_float) ) || + ( t0 > (1.0f-stbir__small_float) ) ) + return 0; + + return 1; +} + +STBIRDEF int stbir_set_output_pixel_subrect( STBIR_RESIZE * resize, int subx, int suby, int subw, int subh ) // sets input region (full region by default) +{ + resize->output_subx = subx; + resize->output_suby = suby; + resize->output_subw = subw; + resize->output_subh = subh; + resize->needs_rebuild = 1; + + // are we inbounds? + if ( ( subx >= resize->output_w ) || ( ( subx + subw ) <= 0 ) || ( suby >= resize->output_h ) || ( ( suby + subh ) <= 0 ) || ( subw == 0 ) || ( subh == 0 ) ) + return 0; + + return 1; +} + +STBIRDEF int stbir_set_pixel_subrect( STBIR_RESIZE * resize, int subx, int suby, int subw, int subh ) // sets both regions (full regions by default) +{ + double s0, t0, s1, t1; + + s0 = ( (double)subx ) / ( (double)resize->output_w ); + t0 = ( (double)suby ) / ( (double)resize->output_h ); + s1 = ( (double)(subx+subw) ) / ( (double)resize->output_w ); + t1 = ( (double)(suby+subh) ) / ( (double)resize->output_h ); + + resize->input_s0 = s0; + resize->input_t0 = t0; + resize->input_s1 = s1; + resize->input_t1 = t1; + resize->output_subx = subx; + resize->output_suby = suby; + resize->output_subw = subw; + resize->output_subh = subh; + resize->needs_rebuild = 1; + + // are we inbounds? + if ( ( subx >= resize->output_w ) || ( ( subx + subw ) <= 0 ) || ( suby >= resize->output_h ) || ( ( suby + subh ) <= 0 ) || ( subw == 0 ) || ( subh == 0 ) ) + return 0; + + return 1; +} + +static int stbir__perform_build( STBIR_RESIZE * resize, int splits ) +{ + stbir__contributors conservative = { 0, 0 }; + stbir__sampler horizontal, vertical; + int new_output_subx, new_output_suby; + stbir__info * out_info; + #ifdef STBIR_PROFILE + stbir__info profile_infod; // used to contain building profile info before everything is allocated + stbir__info * profile_info = &profile_infod; + #endif + + // have we already built the samplers? + if ( resize->samplers ) + return 0; + + #define STBIR_RETURN_ERROR_AND_ASSERT( exp ) STBIR_ASSERT( !(exp) ); if (exp) return 0; + STBIR_RETURN_ERROR_AND_ASSERT( (unsigned)resize->horizontal_filter >= STBIR_FILTER_OTHER) + STBIR_RETURN_ERROR_AND_ASSERT( (unsigned)resize->vertical_filter >= STBIR_FILTER_OTHER) + #undef STBIR_RETURN_ERROR_AND_ASSERT + + if ( splits <= 0 ) + return 0; + + STBIR_PROFILE_BUILD_FIRST_START( build ); + + new_output_subx = resize->output_subx; + new_output_suby = resize->output_suby; + + // do horizontal clip and scale calcs + if ( !stbir__calculate_region_transform( &horizontal.scale_info, resize->output_w, &new_output_subx, resize->output_subw, resize->input_w, resize->input_s0, resize->input_s1 ) ) + return 0; + + // do vertical clip and scale calcs + if ( !stbir__calculate_region_transform( &vertical.scale_info, resize->output_h, &new_output_suby, resize->output_subh, resize->input_h, resize->input_t0, resize->input_t1 ) ) + return 0; + + // if nothing to do, just return + if ( ( horizontal.scale_info.output_sub_size == 0 ) || ( vertical.scale_info.output_sub_size == 0 ) ) + return 0; + + stbir__set_sampler(&horizontal, resize->horizontal_filter, resize->horizontal_filter_kernel, resize->horizontal_filter_support, resize->horizontal_edge, &horizontal.scale_info, 1, resize->user_data ); + stbir__get_conservative_extents( &horizontal, &conservative, resize->user_data ); + stbir__set_sampler(&vertical, resize->vertical_filter, resize->horizontal_filter_kernel, resize->vertical_filter_support, resize->vertical_edge, &vertical.scale_info, 0, resize->user_data ); + + if ( ( vertical.scale_info.output_sub_size / splits ) < STBIR_FORCE_MINIMUM_SCANLINES_FOR_SPLITS ) // each split should be a minimum of 4 scanlines (handwavey choice) + { + splits = vertical.scale_info.output_sub_size / STBIR_FORCE_MINIMUM_SCANLINES_FOR_SPLITS; + if ( splits == 0 ) splits = 1; + } + + STBIR_PROFILE_BUILD_START( alloc ); + out_info = stbir__alloc_internal_mem_and_build_samplers( &horizontal, &vertical, &conservative, resize->input_pixel_layout_public, resize->output_pixel_layout_public, splits, new_output_subx, new_output_suby, resize->fast_alpha, resize->user_data STBIR_ONLY_PROFILE_BUILD_SET_INFO ); + STBIR_PROFILE_BUILD_END( alloc ); + STBIR_PROFILE_BUILD_END( build ); + + if ( out_info ) + { + resize->splits = splits; + resize->samplers = out_info; + resize->needs_rebuild = 0; + #ifdef STBIR_PROFILE + STBIR_MEMCPY( &out_info->profile, &profile_infod.profile, sizeof( out_info->profile ) ); + #endif + + // update anything that can be changed without recalcing samplers + stbir__update_info_from_resize( out_info, resize ); + + return splits; + } + + return 0; +} + +void stbir_free_samplers( STBIR_RESIZE * resize ) +{ + if ( resize->samplers ) + { + stbir__free_internal_mem( resize->samplers ); + resize->samplers = 0; + resize->called_alloc = 0; + } +} + +STBIRDEF int stbir_build_samplers_with_splits( STBIR_RESIZE * resize, int splits ) +{ + if ( ( resize->samplers == 0 ) || ( resize->needs_rebuild ) ) + { + if ( resize->samplers ) + stbir_free_samplers( resize ); + + resize->called_alloc = 1; + return stbir__perform_build( resize, splits ); + } + + STBIR_PROFILE_BUILD_CLEAR( resize->samplers ); + + return 1; +} + +STBIRDEF int stbir_build_samplers( STBIR_RESIZE * resize ) +{ + return stbir_build_samplers_with_splits( resize, 1 ); +} + +STBIRDEF int stbir_resize_extended( STBIR_RESIZE * resize ) +{ + int result; + + if ( ( resize->samplers == 0 ) || ( resize->needs_rebuild ) ) + { + int alloc_state = resize->called_alloc; // remember allocated state + + if ( resize->samplers ) + { + stbir__free_internal_mem( resize->samplers ); + resize->samplers = 0; + } + + if ( !stbir_build_samplers( resize ) ) + return 0; + + resize->called_alloc = alloc_state; + + // if build_samplers succeeded (above), but there are no samplers set, then + // the area to stretch into was zero pixels, so don't do anything and return + // success + if ( resize->samplers == 0 ) + return 1; + } + else + { + // didn't build anything - clear it + STBIR_PROFILE_BUILD_CLEAR( resize->samplers ); + } + + // do resize + result = stbir__perform_resize( resize->samplers, 0, resize->splits ); + + // if we alloced, then free + if ( !resize->called_alloc ) + { + stbir_free_samplers( resize ); + resize->samplers = 0; + } + + return result; +} + +STBIRDEF int stbir_resize_extended_split( STBIR_RESIZE * resize, int split_start, int split_count ) +{ + STBIR_ASSERT( resize->samplers ); + + // if we're just doing the whole thing, call full + if ( ( split_start == -1 ) || ( ( split_start == 0 ) && ( split_count == resize->splits ) ) ) + return stbir_resize_extended( resize ); + + // you **must** build samplers first when using split resize + if ( ( resize->samplers == 0 ) || ( resize->needs_rebuild ) ) + return 0; + + if ( ( split_start >= resize->splits ) || ( split_start < 0 ) || ( ( split_start + split_count ) > resize->splits ) || ( split_count <= 0 ) ) + return 0; + + // do resize + return stbir__perform_resize( resize->samplers, split_start, split_count ); +} + +static int stbir__check_output_stuff( void ** ret_ptr, int * ret_pitch, void * output_pixels, int type_size, int output_w, int output_h, int output_stride_in_bytes, stbir_internal_pixel_layout pixel_layout ) +{ + size_t size; + int pitch; + void * ptr; + + pitch = output_w * type_size * stbir__pixel_channels[ pixel_layout ]; + if ( pitch == 0 ) + return 0; + + if ( output_stride_in_bytes == 0 ) + output_stride_in_bytes = pitch; + + if ( output_stride_in_bytes < pitch ) + return 0; + + size = (size_t)output_stride_in_bytes * (size_t)output_h; + if ( size == 0 ) + return 0; + + *ret_ptr = 0; + *ret_pitch = output_stride_in_bytes; + + if ( output_pixels == 0 ) + { + ptr = STBIR_MALLOC( size, 0 ); + if ( ptr == 0 ) + return 0; + + *ret_ptr = ptr; + *ret_pitch = pitch; + } + + return 1; +} + + +STBIRDEF unsigned char * stbir_resize_uint8_linear( const unsigned char *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + unsigned char *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_layout ) +{ + STBIR_RESIZE resize; + unsigned char * optr; + int opitch; + + if ( !stbir__check_output_stuff( (void**)&optr, &opitch, output_pixels, sizeof( unsigned char ), output_w, output_h, output_stride_in_bytes, stbir__pixel_layout_convert_public_to_internal[ pixel_layout ] ) ) + return 0; + + stbir_resize_init( &resize, + input_pixels, input_w, input_h, input_stride_in_bytes, + (optr) ? optr : output_pixels, output_w, output_h, opitch, + pixel_layout, STBIR_TYPE_UINT8 ); + + if ( !stbir_resize_extended( &resize ) ) + { + if ( optr ) + STBIR_FREE( optr, 0 ); + return 0; + } + + return (optr) ? optr : output_pixels; +} + +STBIRDEF unsigned char * stbir_resize_uint8_srgb( const unsigned char *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + unsigned char *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_layout ) +{ + STBIR_RESIZE resize; + unsigned char * optr; + int opitch; + + if ( !stbir__check_output_stuff( (void**)&optr, &opitch, output_pixels, sizeof( unsigned char ), output_w, output_h, output_stride_in_bytes, stbir__pixel_layout_convert_public_to_internal[ pixel_layout ] ) ) + return 0; + + stbir_resize_init( &resize, + input_pixels, input_w, input_h, input_stride_in_bytes, + (optr) ? optr : output_pixels, output_w, output_h, opitch, + pixel_layout, STBIR_TYPE_UINT8_SRGB ); + + if ( !stbir_resize_extended( &resize ) ) + { + if ( optr ) + STBIR_FREE( optr, 0 ); + return 0; + } + + return (optr) ? optr : output_pixels; +} + + +STBIRDEF float * stbir_resize_float_linear( const float *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + float *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_layout ) +{ + STBIR_RESIZE resize; + float * optr; + int opitch; + + if ( !stbir__check_output_stuff( (void**)&optr, &opitch, output_pixels, sizeof( float ), output_w, output_h, output_stride_in_bytes, stbir__pixel_layout_convert_public_to_internal[ pixel_layout ] ) ) + return 0; + + stbir_resize_init( &resize, + input_pixels, input_w, input_h, input_stride_in_bytes, + (optr) ? optr : output_pixels, output_w, output_h, opitch, + pixel_layout, STBIR_TYPE_FLOAT ); + + if ( !stbir_resize_extended( &resize ) ) + { + if ( optr ) + STBIR_FREE( optr, 0 ); + return 0; + } + + return (optr) ? optr : output_pixels; +} + + +STBIRDEF void * stbir_resize( const void *input_pixels , int input_w , int input_h, int input_stride_in_bytes, + void *output_pixels, int output_w, int output_h, int output_stride_in_bytes, + stbir_pixel_layout pixel_layout, stbir_datatype data_type, + stbir_edge edge, stbir_filter filter ) +{ + STBIR_RESIZE resize; + float * optr; + int opitch; + + if ( !stbir__check_output_stuff( (void**)&optr, &opitch, output_pixels, stbir__type_size[data_type], output_w, output_h, output_stride_in_bytes, stbir__pixel_layout_convert_public_to_internal[ pixel_layout ] ) ) + return 0; + + stbir_resize_init( &resize, + input_pixels, input_w, input_h, input_stride_in_bytes, + (optr) ? optr : output_pixels, output_w, output_h, output_stride_in_bytes, + pixel_layout, data_type ); + + resize.horizontal_edge = edge; + resize.vertical_edge = edge; + resize.horizontal_filter = filter; + resize.vertical_filter = filter; + + if ( !stbir_resize_extended( &resize ) ) + { + if ( optr ) + STBIR_FREE( optr, 0 ); + return 0; + } + + return (optr) ? optr : output_pixels; +} + +#ifdef STBIR_PROFILE + +STBIRDEF void stbir_resize_build_profile_info( STBIR_PROFILE_INFO * info, STBIR_RESIZE const * resize ) +{ + static char const * bdescriptions[6] = { "Building", "Allocating", "Horizontal sampler", "Vertical sampler", "Coefficient cleanup", "Coefficient piovot" } ; + stbir__info* samp = resize->samplers; + int i; + + typedef int testa[ (STBIR__ARRAY_SIZE( bdescriptions ) == (STBIR__ARRAY_SIZE( samp->profile.array )-1) )?1:-1]; + typedef int testb[ (sizeof( samp->profile.array ) == (sizeof(samp->profile.named)) )?1:-1]; + typedef int testc[ (sizeof( info->clocks ) >= (sizeof(samp->profile.named)) )?1:-1]; + + for( i = 0 ; i < STBIR__ARRAY_SIZE( bdescriptions ) ; i++) + info->clocks[i] = samp->profile.array[i+1]; + + info->total_clocks = samp->profile.named.total; + info->descriptions = bdescriptions; + info->count = STBIR__ARRAY_SIZE( bdescriptions ); +} + +STBIRDEF void stbir_resize_split_profile_info( STBIR_PROFILE_INFO * info, STBIR_RESIZE const * resize, int split_start, int split_count ) +{ + static char const * descriptions[7] = { "Looping", "Vertical sampling", "Horizontal sampling", "Scanline input", "Scanline output", "Alpha weighting", "Alpha unweighting" }; + stbir__per_split_info * split_info; + int s, i; + + typedef int testa[ (STBIR__ARRAY_SIZE( descriptions ) == (STBIR__ARRAY_SIZE( split_info->profile.array )-1) )?1:-1]; + typedef int testb[ (sizeof( split_info->profile.array ) == (sizeof(split_info->profile.named)) )?1:-1]; + typedef int testc[ (sizeof( info->clocks ) >= (sizeof(split_info->profile.named)) )?1:-1]; + + if ( split_start == -1 ) + { + split_start = 0; + split_count = resize->samplers->splits; + } + + if ( ( split_start >= resize->splits ) || ( split_start < 0 ) || ( ( split_start + split_count ) > resize->splits ) || ( split_count <= 0 ) ) + { + info->total_clocks = 0; + info->descriptions = 0; + info->count = 0; + return; + } + + split_info = resize->samplers->split_info + split_start; + + // sum up the profile from all the splits + for( i = 0 ; i < STBIR__ARRAY_SIZE( descriptions ) ; i++ ) + { + stbir_uint64 sum = 0; + for( s = 0 ; s < split_count ; s++ ) + sum += split_info[s].profile.array[i+1]; + info->clocks[i] = sum; + } + + info->total_clocks = split_info->profile.named.total; + info->descriptions = descriptions; + info->count = STBIR__ARRAY_SIZE( descriptions ); +} + +STBIRDEF void stbir_resize_extended_profile_info( STBIR_PROFILE_INFO * info, STBIR_RESIZE const * resize ) +{ + stbir_resize_split_profile_info( info, resize, -1, 0 ); +} + +#endif // STBIR_PROFILE + +#undef STBIR_BGR +#undef STBIR_1CHANNEL +#undef STBIR_2CHANNEL +#undef STBIR_RGB +#undef STBIR_RGBA +#undef STBIR_4CHANNEL +#undef STBIR_BGRA +#undef STBIR_ARGB +#undef STBIR_ABGR +#undef STBIR_RA +#undef STBIR_AR +#undef STBIR_RGBA_PM +#undef STBIR_BGRA_PM +#undef STBIR_ARGB_PM +#undef STBIR_ABGR_PM +#undef STBIR_RA_PM +#undef STBIR_AR_PM + +#endif // STB_IMAGE_RESIZE_IMPLEMENTATION + +#else // STB_IMAGE_RESIZE_HORIZONTALS&STB_IMAGE_RESIZE_DO_VERTICALS + +// we reinclude the header file to define all the horizontal functions +// specializing each function for the number of coeffs is 20-40% faster *OVERALL* + +// by including the header file again this way, we can still debug the functions + +#define STBIR_strs_join2( start, mid, end ) start##mid##end +#define STBIR_strs_join1( start, mid, end ) STBIR_strs_join2( start, mid, end ) + +#define STBIR_strs_join24( start, mid1, mid2, end ) start##mid1##mid2##end +#define STBIR_strs_join14( start, mid1, mid2, end ) STBIR_strs_join24( start, mid1, mid2, end ) + +#ifdef STB_IMAGE_RESIZE_DO_CODERS + +#ifdef stbir__decode_suffix +#define STBIR__CODER_NAME( name ) STBIR_strs_join1( name, _, stbir__decode_suffix ) +#else +#define STBIR__CODER_NAME( name ) name +#endif + +#ifdef stbir__decode_swizzle +#define stbir__decode_simdf8_flip(reg) STBIR_strs_join1( STBIR_strs_join1( STBIR_strs_join1( STBIR_strs_join1( stbir__simdf8_0123to,stbir__decode_order0,stbir__decode_order1),stbir__decode_order2,stbir__decode_order3),stbir__decode_order0,stbir__decode_order1),stbir__decode_order2,stbir__decode_order3)(reg, reg) +#define stbir__decode_simdf4_flip(reg) STBIR_strs_join1( STBIR_strs_join1( stbir__simdf_0123to,stbir__decode_order0,stbir__decode_order1),stbir__decode_order2,stbir__decode_order3)(reg, reg) +#define stbir__encode_simdf8_unflip(reg) STBIR_strs_join1( STBIR_strs_join1( STBIR_strs_join1( STBIR_strs_join1( stbir__simdf8_0123to,stbir__encode_order0,stbir__encode_order1),stbir__encode_order2,stbir__encode_order3),stbir__encode_order0,stbir__encode_order1),stbir__encode_order2,stbir__encode_order3)(reg, reg) +#define stbir__encode_simdf4_unflip(reg) STBIR_strs_join1( STBIR_strs_join1( stbir__simdf_0123to,stbir__encode_order0,stbir__encode_order1),stbir__encode_order2,stbir__encode_order3)(reg, reg) +#else +#define stbir__decode_order0 0 +#define stbir__decode_order1 1 +#define stbir__decode_order2 2 +#define stbir__decode_order3 3 +#define stbir__encode_order0 0 +#define stbir__encode_order1 1 +#define stbir__encode_order2 2 +#define stbir__encode_order3 3 +#define stbir__decode_simdf8_flip(reg) +#define stbir__decode_simdf4_flip(reg) +#define stbir__encode_simdf8_unflip(reg) +#define stbir__encode_simdf4_unflip(reg) +#endif + +#ifdef STBIR_SIMD8 +#define stbir__encode_simdfX_unflip stbir__encode_simdf8_unflip +#else +#define stbir__encode_simdfX_unflip stbir__encode_simdf4_unflip +#endif + +static void STBIR__CODER_NAME( stbir__decode_uint8_linear_scaled )( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float * decode_end = (float*) decode + width_times_channels; + unsigned char const * input = (unsigned char const*)inputp; + + #ifdef STBIR_SIMD + unsigned char const * end_input_m16 = input + width_times_channels - 16; + if ( width_times_channels >= 16 ) + { + decode_end -= 16; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + #ifdef STBIR_SIMD8 + stbir__simdi i; stbir__simdi8 o0,o1; + stbir__simdf8 of0, of1; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi8_expand_u8_to_u32( o0, o1, i ); + stbir__simdi8_convert_i32_to_float( of0, o0 ); + stbir__simdi8_convert_i32_to_float( of1, o1 ); + stbir__simdf8_mult( of0, of0, STBIR_max_uint8_as_float_inverted8); + stbir__simdf8_mult( of1, of1, STBIR_max_uint8_as_float_inverted8); + stbir__decode_simdf8_flip( of0 ); + stbir__decode_simdf8_flip( of1 ); + stbir__simdf8_store( decode + 0, of0 ); + stbir__simdf8_store( decode + 8, of1 ); + #else + stbir__simdi i, o0, o1, o2, o3; + stbir__simdf of0, of1, of2, of3; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi_expand_u8_to_u32( o0,o1,o2,o3,i); + stbir__simdi_convert_i32_to_float( of0, o0 ); + stbir__simdi_convert_i32_to_float( of1, o1 ); + stbir__simdi_convert_i32_to_float( of2, o2 ); + stbir__simdi_convert_i32_to_float( of3, o3 ); + stbir__simdf_mult( of0, of0, STBIR__CONSTF(STBIR_max_uint8_as_float_inverted) ); + stbir__simdf_mult( of1, of1, STBIR__CONSTF(STBIR_max_uint8_as_float_inverted) ); + stbir__simdf_mult( of2, of2, STBIR__CONSTF(STBIR_max_uint8_as_float_inverted) ); + stbir__simdf_mult( of3, of3, STBIR__CONSTF(STBIR_max_uint8_as_float_inverted) ); + stbir__decode_simdf4_flip( of0 ); + stbir__decode_simdf4_flip( of1 ); + stbir__decode_simdf4_flip( of2 ); + stbir__decode_simdf4_flip( of3 ); + stbir__simdf_store( decode + 0, of0 ); + stbir__simdf_store( decode + 4, of1 ); + stbir__simdf_store( decode + 8, of2 ); + stbir__simdf_store( decode + 12, of3 ); + #endif + decode += 16; + input += 16; + if ( decode <= decode_end ) + continue; + if ( decode == ( decode_end + 16 ) ) + break; + decode = decode_end; // backup and do last couple + input = end_input_m16; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode <= decode_end ) + { + STBIR_SIMD_NO_UNROLL(decode); + decode[0-4] = ((float)(input[stbir__decode_order0])) * stbir__max_uint8_as_float_inverted; + decode[1-4] = ((float)(input[stbir__decode_order1])) * stbir__max_uint8_as_float_inverted; + decode[2-4] = ((float)(input[stbir__decode_order2])) * stbir__max_uint8_as_float_inverted; + decode[3-4] = ((float)(input[stbir__decode_order3])) * stbir__max_uint8_as_float_inverted; + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = ((float)(input[stbir__decode_order0])) * stbir__max_uint8_as_float_inverted; + #if stbir__coder_min_num >= 2 + decode[1] = ((float)(input[stbir__decode_order1])) * stbir__max_uint8_as_float_inverted; + #endif + #if stbir__coder_min_num >= 3 + decode[2] = ((float)(input[stbir__decode_order2])) * stbir__max_uint8_as_float_inverted; + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME( stbir__encode_uint8_linear_scaled )( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned char STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned char *) outputp; + unsigned char * end_output = ( (unsigned char *) output ) + width_times_channels; + + #ifdef STBIR_SIMD + if ( width_times_channels >= stbir__simdfX_float_count*2 ) + { + float const * end_encode_m8 = encode + width_times_channels - stbir__simdfX_float_count*2; + end_output -= stbir__simdfX_float_count*2; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdfX e0, e1; + stbir__simdi i; + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdfX_madd_mem( e0, STBIR_simd_point5X, STBIR_max_uint8_as_floatX, encode ); + stbir__simdfX_madd_mem( e1, STBIR_simd_point5X, STBIR_max_uint8_as_floatX, encode+stbir__simdfX_float_count ); + stbir__encode_simdfX_unflip( e0 ); + stbir__encode_simdfX_unflip( e1 ); + #ifdef STBIR_SIMD8 + stbir__simdf8_pack_to_16bytes( i, e0, e1 ); + stbir__simdi_store( output, i ); + #else + stbir__simdf_pack_to_8bytes( i, e0, e1 ); + stbir__simdi_store2( output, i ); + #endif + encode += stbir__simdfX_float_count*2; + output += stbir__simdfX_float_count*2; + if ( output <= end_output ) + continue; + if ( output == ( end_output + stbir__simdfX_float_count*2 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m8; + } + return; + } + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + stbir__simdf e0; + stbir__simdi i0; + STBIR_NO_UNROLL(encode); + stbir__simdf_load( e0, encode ); + stbir__simdf_madd( e0, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint8_as_float), e0 ); + stbir__encode_simdf4_unflip( e0 ); + stbir__simdf_pack_to_8bytes( i0, e0, e0 ); // only use first 4 + *(int*)(output-4) = stbir__simdi_to_int( i0 ); + output += 4; + encode += 4; + } + output -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + stbir__simdf e0; + STBIR_NO_UNROLL(encode); + stbir__simdf_madd1_mem( e0, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint8_as_float), encode+stbir__encode_order0 ); output[0] = stbir__simdf_convert_float_to_uint8( e0 ); + #if stbir__coder_min_num >= 2 + stbir__simdf_madd1_mem( e0, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint8_as_float), encode+stbir__encode_order1 ); output[1] = stbir__simdf_convert_float_to_uint8( e0 ); + #endif + #if stbir__coder_min_num >= 3 + stbir__simdf_madd1_mem( e0, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint8_as_float), encode+stbir__encode_order2 ); output[2] = stbir__simdf_convert_float_to_uint8( e0 ); + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif + + #else + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + while( output <= end_output ) + { + float f; + f = encode[stbir__encode_order0] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[0-4] = (unsigned char)f; + f = encode[stbir__encode_order1] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[1-4] = (unsigned char)f; + f = encode[stbir__encode_order2] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[2-4] = (unsigned char)f; + f = encode[stbir__encode_order3] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[3-4] = (unsigned char)f; + output += 4; + encode += 4; + } + output -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + float f; + STBIR_NO_UNROLL(encode); + f = encode[stbir__encode_order0] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[0] = (unsigned char)f; + #if stbir__coder_min_num >= 2 + f = encode[stbir__encode_order1] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[1] = (unsigned char)f; + #endif + #if stbir__coder_min_num >= 3 + f = encode[stbir__encode_order2] * stbir__max_uint8_as_float + 0.5f; STBIR_CLAMP(f, 0, 255); output[2] = (unsigned char)f; + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif + #endif +} + +static void STBIR__CODER_NAME(stbir__decode_uint8_linear)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float * decode_end = (float*) decode + width_times_channels; + unsigned char const * input = (unsigned char const*)inputp; + + #ifdef STBIR_SIMD + unsigned char const * end_input_m16 = input + width_times_channels - 16; + if ( width_times_channels >= 16 ) + { + decode_end -= 16; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + #ifdef STBIR_SIMD8 + stbir__simdi i; stbir__simdi8 o0,o1; + stbir__simdf8 of0, of1; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi8_expand_u8_to_u32( o0, o1, i ); + stbir__simdi8_convert_i32_to_float( of0, o0 ); + stbir__simdi8_convert_i32_to_float( of1, o1 ); + stbir__decode_simdf8_flip( of0 ); + stbir__decode_simdf8_flip( of1 ); + stbir__simdf8_store( decode + 0, of0 ); + stbir__simdf8_store( decode + 8, of1 ); + #else + stbir__simdi i, o0, o1, o2, o3; + stbir__simdf of0, of1, of2, of3; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi_expand_u8_to_u32( o0,o1,o2,o3,i); + stbir__simdi_convert_i32_to_float( of0, o0 ); + stbir__simdi_convert_i32_to_float( of1, o1 ); + stbir__simdi_convert_i32_to_float( of2, o2 ); + stbir__simdi_convert_i32_to_float( of3, o3 ); + stbir__decode_simdf4_flip( of0 ); + stbir__decode_simdf4_flip( of1 ); + stbir__decode_simdf4_flip( of2 ); + stbir__decode_simdf4_flip( of3 ); + stbir__simdf_store( decode + 0, of0 ); + stbir__simdf_store( decode + 4, of1 ); + stbir__simdf_store( decode + 8, of2 ); + stbir__simdf_store( decode + 12, of3 ); +#endif + decode += 16; + input += 16; + if ( decode <= decode_end ) + continue; + if ( decode == ( decode_end + 16 ) ) + break; + decode = decode_end; // backup and do last couple + input = end_input_m16; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode <= decode_end ) + { + STBIR_SIMD_NO_UNROLL(decode); + decode[0-4] = ((float)(input[stbir__decode_order0])); + decode[1-4] = ((float)(input[stbir__decode_order1])); + decode[2-4] = ((float)(input[stbir__decode_order2])); + decode[3-4] = ((float)(input[stbir__decode_order3])); + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = ((float)(input[stbir__decode_order0])); + #if stbir__coder_min_num >= 2 + decode[1] = ((float)(input[stbir__decode_order1])); + #endif + #if stbir__coder_min_num >= 3 + decode[2] = ((float)(input[stbir__decode_order2])); + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME( stbir__encode_uint8_linear )( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned char STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned char *) outputp; + unsigned char * end_output = ( (unsigned char *) output ) + width_times_channels; + + #ifdef STBIR_SIMD + if ( width_times_channels >= stbir__simdfX_float_count*2 ) + { + float const * end_encode_m8 = encode + width_times_channels - stbir__simdfX_float_count*2; + end_output -= stbir__simdfX_float_count*2; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdfX e0, e1; + stbir__simdi i; + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdfX_add_mem( e0, STBIR_simd_point5X, encode ); + stbir__simdfX_add_mem( e1, STBIR_simd_point5X, encode+stbir__simdfX_float_count ); + stbir__encode_simdfX_unflip( e0 ); + stbir__encode_simdfX_unflip( e1 ); + #ifdef STBIR_SIMD8 + stbir__simdf8_pack_to_16bytes( i, e0, e1 ); + stbir__simdi_store( output, i ); + #else + stbir__simdf_pack_to_8bytes( i, e0, e1 ); + stbir__simdi_store2( output, i ); + #endif + encode += stbir__simdfX_float_count*2; + output += stbir__simdfX_float_count*2; + if ( output <= end_output ) + continue; + if ( output == ( end_output + stbir__simdfX_float_count*2 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m8; + } + return; + } + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + stbir__simdf e0; + stbir__simdi i0; + STBIR_NO_UNROLL(encode); + stbir__simdf_load( e0, encode ); + stbir__simdf_add( e0, STBIR__CONSTF(STBIR_simd_point5), e0 ); + stbir__encode_simdf4_unflip( e0 ); + stbir__simdf_pack_to_8bytes( i0, e0, e0 ); // only use first 4 + *(int*)(output-4) = stbir__simdi_to_int( i0 ); + output += 4; + encode += 4; + } + output -= 4; + #endif + + #else + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + while( output <= end_output ) + { + float f; + f = encode[stbir__encode_order0] + 0.5f; STBIR_CLAMP(f, 0, 255); output[0-4] = (unsigned char)f; + f = encode[stbir__encode_order1] + 0.5f; STBIR_CLAMP(f, 0, 255); output[1-4] = (unsigned char)f; + f = encode[stbir__encode_order2] + 0.5f; STBIR_CLAMP(f, 0, 255); output[2-4] = (unsigned char)f; + f = encode[stbir__encode_order3] + 0.5f; STBIR_CLAMP(f, 0, 255); output[3-4] = (unsigned char)f; + output += 4; + encode += 4; + } + output -= 4; + #endif + + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + float f; + STBIR_NO_UNROLL(encode); + f = encode[stbir__encode_order0] + 0.5f; STBIR_CLAMP(f, 0, 255); output[0] = (unsigned char)f; + #if stbir__coder_min_num >= 2 + f = encode[stbir__encode_order1] + 0.5f; STBIR_CLAMP(f, 0, 255); output[1] = (unsigned char)f; + #endif + #if stbir__coder_min_num >= 3 + f = encode[stbir__encode_order2] + 0.5f; STBIR_CLAMP(f, 0, 255); output[2] = (unsigned char)f; + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME(stbir__decode_uint8_srgb)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float const * decode_end = (float*) decode + width_times_channels; + unsigned char const * input = (unsigned char const *)inputp; + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + while( decode <= decode_end ) + { + decode[0-4] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order0 ] ]; + decode[1-4] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order1 ] ]; + decode[2-4] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order2 ] ]; + decode[3-4] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order3 ] ]; + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order0 ] ]; + #if stbir__coder_min_num >= 2 + decode[1] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order1 ] ]; + #endif + #if stbir__coder_min_num >= 3 + decode[2] = stbir__srgb_uchar_to_linear_float[ input[ stbir__decode_order2 ] ]; + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif +} + +#define stbir__min_max_shift20( i, f ) \ + stbir__simdf_max( f, f, stbir_simdf_casti(STBIR__CONSTI( STBIR_almost_zero )) ); \ + stbir__simdf_min( f, f, stbir_simdf_casti(STBIR__CONSTI( STBIR_almost_one )) ); \ + stbir__simdi_32shr( i, stbir_simdi_castf( f ), 20 ); + +#define stbir__scale_and_convert( i, f ) \ + stbir__simdf_madd( f, STBIR__CONSTF( STBIR_simd_point5 ), STBIR__CONSTF( STBIR_max_uint8_as_float ), f ); \ + stbir__simdf_max( f, f, stbir__simdf_zeroP() ); \ + stbir__simdf_min( f, f, STBIR__CONSTF( STBIR_max_uint8_as_float ) ); \ + stbir__simdf_convert_float_to_i32( i, f ); + +#define stbir__linear_to_srgb_finish( i, f ) \ +{ \ + stbir__simdi temp; \ + stbir__simdi_32shr( temp, stbir_simdi_castf( f ), 12 ) ; \ + stbir__simdi_and( temp, temp, STBIR__CONSTI(STBIR_mastissa_mask) ); \ + stbir__simdi_or( temp, temp, STBIR__CONSTI(STBIR_topscale) ); \ + stbir__simdi_16madd( i, i, temp ); \ + stbir__simdi_32shr( i, i, 16 ); \ +} + +#define stbir__simdi_table_lookup2( v0,v1, table ) \ +{ \ + stbir__simdi_u32 temp0,temp1; \ + temp0.m128i_i128 = v0; \ + temp1.m128i_i128 = v1; \ + temp0.m128i_u32[0] = table[temp0.m128i_i32[0]]; temp0.m128i_u32[1] = table[temp0.m128i_i32[1]]; temp0.m128i_u32[2] = table[temp0.m128i_i32[2]]; temp0.m128i_u32[3] = table[temp0.m128i_i32[3]]; \ + temp1.m128i_u32[0] = table[temp1.m128i_i32[0]]; temp1.m128i_u32[1] = table[temp1.m128i_i32[1]]; temp1.m128i_u32[2] = table[temp1.m128i_i32[2]]; temp1.m128i_u32[3] = table[temp1.m128i_i32[3]]; \ + v0 = temp0.m128i_i128; \ + v1 = temp1.m128i_i128; \ +} + +#define stbir__simdi_table_lookup3( v0,v1,v2, table ) \ +{ \ + stbir__simdi_u32 temp0,temp1,temp2; \ + temp0.m128i_i128 = v0; \ + temp1.m128i_i128 = v1; \ + temp2.m128i_i128 = v2; \ + temp0.m128i_u32[0] = table[temp0.m128i_i32[0]]; temp0.m128i_u32[1] = table[temp0.m128i_i32[1]]; temp0.m128i_u32[2] = table[temp0.m128i_i32[2]]; temp0.m128i_u32[3] = table[temp0.m128i_i32[3]]; \ + temp1.m128i_u32[0] = table[temp1.m128i_i32[0]]; temp1.m128i_u32[1] = table[temp1.m128i_i32[1]]; temp1.m128i_u32[2] = table[temp1.m128i_i32[2]]; temp1.m128i_u32[3] = table[temp1.m128i_i32[3]]; \ + temp2.m128i_u32[0] = table[temp2.m128i_i32[0]]; temp2.m128i_u32[1] = table[temp2.m128i_i32[1]]; temp2.m128i_u32[2] = table[temp2.m128i_i32[2]]; temp2.m128i_u32[3] = table[temp2.m128i_i32[3]]; \ + v0 = temp0.m128i_i128; \ + v1 = temp1.m128i_i128; \ + v2 = temp2.m128i_i128; \ +} + +#define stbir__simdi_table_lookup4( v0,v1,v2,v3, table ) \ +{ \ + stbir__simdi_u32 temp0,temp1,temp2,temp3; \ + temp0.m128i_i128 = v0; \ + temp1.m128i_i128 = v1; \ + temp2.m128i_i128 = v2; \ + temp3.m128i_i128 = v3; \ + temp0.m128i_u32[0] = table[temp0.m128i_i32[0]]; temp0.m128i_u32[1] = table[temp0.m128i_i32[1]]; temp0.m128i_u32[2] = table[temp0.m128i_i32[2]]; temp0.m128i_u32[3] = table[temp0.m128i_i32[3]]; \ + temp1.m128i_u32[0] = table[temp1.m128i_i32[0]]; temp1.m128i_u32[1] = table[temp1.m128i_i32[1]]; temp1.m128i_u32[2] = table[temp1.m128i_i32[2]]; temp1.m128i_u32[3] = table[temp1.m128i_i32[3]]; \ + temp2.m128i_u32[0] = table[temp2.m128i_i32[0]]; temp2.m128i_u32[1] = table[temp2.m128i_i32[1]]; temp2.m128i_u32[2] = table[temp2.m128i_i32[2]]; temp2.m128i_u32[3] = table[temp2.m128i_i32[3]]; \ + temp3.m128i_u32[0] = table[temp3.m128i_i32[0]]; temp3.m128i_u32[1] = table[temp3.m128i_i32[1]]; temp3.m128i_u32[2] = table[temp3.m128i_i32[2]]; temp3.m128i_u32[3] = table[temp3.m128i_i32[3]]; \ + v0 = temp0.m128i_i128; \ + v1 = temp1.m128i_i128; \ + v2 = temp2.m128i_i128; \ + v3 = temp3.m128i_i128; \ +} + +static void STBIR__CODER_NAME( stbir__encode_uint8_srgb )( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned char STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned char*) outputp; + unsigned char * end_output = ( (unsigned char*) output ) + width_times_channels; + + #ifdef STBIR_SIMD + + if ( width_times_channels >= 16 ) + { + float const * end_encode_m16 = encode + width_times_channels - 16; + end_output -= 16; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdf f0, f1, f2, f3; + stbir__simdi i0, i1, i2, i3; + STBIR_SIMD_NO_UNROLL(encode); + + stbir__simdf_load4_transposed( f0, f1, f2, f3, encode ); + + stbir__min_max_shift20( i0, f0 ); + stbir__min_max_shift20( i1, f1 ); + stbir__min_max_shift20( i2, f2 ); + stbir__min_max_shift20( i3, f3 ); + + stbir__simdi_table_lookup4( i0, i1, i2, i3, ( fp32_to_srgb8_tab4 - (127-13)*8 ) ); + + stbir__linear_to_srgb_finish( i0, f0 ); + stbir__linear_to_srgb_finish( i1, f1 ); + stbir__linear_to_srgb_finish( i2, f2 ); + stbir__linear_to_srgb_finish( i3, f3 ); + + stbir__interleave_pack_and_store_16_u8( output, STBIR_strs_join1(i, ,stbir__encode_order0), STBIR_strs_join1(i, ,stbir__encode_order1), STBIR_strs_join1(i, ,stbir__encode_order2), STBIR_strs_join1(i, ,stbir__encode_order3) ); + + encode += 16; + output += 16; + if ( output <= end_output ) + continue; + if ( output == ( end_output + 16 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m16; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while ( output <= end_output ) + { + STBIR_SIMD_NO_UNROLL(encode); + + output[0-4] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order0] ); + output[1-4] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order1] ); + output[2-4] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order2] ); + output[3-4] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order3] ); + + output += 4; + encode += 4; + } + output -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + STBIR_NO_UNROLL(encode); + output[0] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order0] ); + #if stbir__coder_min_num >= 2 + output[1] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order1] ); + #endif + #if stbir__coder_min_num >= 3 + output[2] = stbir__linear_to_srgb_uchar( encode[stbir__encode_order2] ); + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif +} + +#if ( stbir__coder_min_num == 4 ) || ( ( stbir__coder_min_num == 1 ) && ( !defined(stbir__decode_swizzle) ) ) + +static void STBIR__CODER_NAME(stbir__decode_uint8_srgb4_linearalpha)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float const * decode_end = (float*) decode + width_times_channels; + unsigned char const * input = (unsigned char const *)inputp; + do { + decode[0] = stbir__srgb_uchar_to_linear_float[ input[stbir__decode_order0] ]; + decode[1] = stbir__srgb_uchar_to_linear_float[ input[stbir__decode_order1] ]; + decode[2] = stbir__srgb_uchar_to_linear_float[ input[stbir__decode_order2] ]; + decode[3] = ( (float) input[stbir__decode_order3] ) * stbir__max_uint8_as_float_inverted; + input += 4; + decode += 4; + } while( decode < decode_end ); +} + + +static void STBIR__CODER_NAME( stbir__encode_uint8_srgb4_linearalpha )( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned char STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned char*) outputp; + unsigned char * end_output = ( (unsigned char*) output ) + width_times_channels; + + #ifdef STBIR_SIMD + + if ( width_times_channels >= 16 ) + { + float const * end_encode_m16 = encode + width_times_channels - 16; + end_output -= 16; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdf f0, f1, f2, f3; + stbir__simdi i0, i1, i2, i3; + + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdf_load4_transposed( f0, f1, f2, f3, encode ); + + stbir__min_max_shift20( i0, f0 ); + stbir__min_max_shift20( i1, f1 ); + stbir__min_max_shift20( i2, f2 ); + stbir__scale_and_convert( i3, f3 ); + + stbir__simdi_table_lookup3( i0, i1, i2, ( fp32_to_srgb8_tab4 - (127-13)*8 ) ); + + stbir__linear_to_srgb_finish( i0, f0 ); + stbir__linear_to_srgb_finish( i1, f1 ); + stbir__linear_to_srgb_finish( i2, f2 ); + + stbir__interleave_pack_and_store_16_u8( output, STBIR_strs_join1(i, ,stbir__encode_order0), STBIR_strs_join1(i, ,stbir__encode_order1), STBIR_strs_join1(i, ,stbir__encode_order2), STBIR_strs_join1(i, ,stbir__encode_order3) ); + + output += 16; + encode += 16; + + if ( output <= end_output ) + continue; + if ( output == ( end_output + 16 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m16; + } + return; + } + #endif + + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float f; + STBIR_SIMD_NO_UNROLL(encode); + + output[stbir__decode_order0] = stbir__linear_to_srgb_uchar( encode[0] ); + output[stbir__decode_order1] = stbir__linear_to_srgb_uchar( encode[1] ); + output[stbir__decode_order2] = stbir__linear_to_srgb_uchar( encode[2] ); + + f = encode[3] * stbir__max_uint8_as_float + 0.5f; + STBIR_CLAMP(f, 0, 255); + output[stbir__decode_order3] = (unsigned char) f; + + output += 4; + encode += 4; + } while( output < end_output ); +} + +#endif + +#if ( stbir__coder_min_num == 2 ) || ( ( stbir__coder_min_num == 1 ) && ( !defined(stbir__decode_swizzle) ) ) + +static void STBIR__CODER_NAME(stbir__decode_uint8_srgb2_linearalpha)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float const * decode_end = (float*) decode + width_times_channels; + unsigned char const * input = (unsigned char const *)inputp; + decode += 4; + while( decode <= decode_end ) + { + decode[0-4] = stbir__srgb_uchar_to_linear_float[ input[stbir__decode_order0] ]; + decode[1-4] = ( (float) input[stbir__decode_order1] ) * stbir__max_uint8_as_float_inverted; + decode[2-4] = stbir__srgb_uchar_to_linear_float[ input[stbir__decode_order0+2] ]; + decode[3-4] = ( (float) input[stbir__decode_order1+2] ) * stbir__max_uint8_as_float_inverted; + input += 4; + decode += 4; + } + decode -= 4; + if( decode < decode_end ) + { + decode[0] = stbir__srgb_uchar_to_linear_float[ stbir__decode_order0 ]; + decode[1] = ( (float) input[stbir__decode_order1] ) * stbir__max_uint8_as_float_inverted; + } +} + +static void STBIR__CODER_NAME( stbir__encode_uint8_srgb2_linearalpha )( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned char STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned char*) outputp; + unsigned char * end_output = ( (unsigned char*) output ) + width_times_channels; + + #ifdef STBIR_SIMD + + if ( width_times_channels >= 16 ) + { + float const * end_encode_m16 = encode + width_times_channels - 16; + end_output -= 16; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdf f0, f1, f2, f3; + stbir__simdi i0, i1, i2, i3; + + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdf_load4_transposed( f0, f1, f2, f3, encode ); + + stbir__min_max_shift20( i0, f0 ); + stbir__scale_and_convert( i1, f1 ); + stbir__min_max_shift20( i2, f2 ); + stbir__scale_and_convert( i3, f3 ); + + stbir__simdi_table_lookup2( i0, i2, ( fp32_to_srgb8_tab4 - (127-13)*8 ) ); + + stbir__linear_to_srgb_finish( i0, f0 ); + stbir__linear_to_srgb_finish( i2, f2 ); + + stbir__interleave_pack_and_store_16_u8( output, STBIR_strs_join1(i, ,stbir__encode_order0), STBIR_strs_join1(i, ,stbir__encode_order1), STBIR_strs_join1(i, ,stbir__encode_order2), STBIR_strs_join1(i, ,stbir__encode_order3) ); + + output += 16; + encode += 16; + if ( output <= end_output ) + continue; + if ( output == ( end_output + 16 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m16; + } + return; + } + #endif + + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float f; + STBIR_SIMD_NO_UNROLL(encode); + + output[stbir__decode_order0] = stbir__linear_to_srgb_uchar( encode[0] ); + + f = encode[1] * stbir__max_uint8_as_float + 0.5f; + STBIR_CLAMP(f, 0, 255); + output[stbir__decode_order1] = (unsigned char) f; + + output += 2; + encode += 2; + } while( output < end_output ); +} + +#endif + +static void STBIR__CODER_NAME(stbir__decode_uint16_linear_scaled)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float * decode_end = (float*) decode + width_times_channels; + unsigned short const * input = (unsigned short const *)inputp; + + #ifdef STBIR_SIMD + unsigned short const * end_input_m8 = input + width_times_channels - 8; + if ( width_times_channels >= 8 ) + { + decode_end -= 8; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + #ifdef STBIR_SIMD8 + stbir__simdi i; stbir__simdi8 o; + stbir__simdf8 of; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi8_expand_u16_to_u32( o, i ); + stbir__simdi8_convert_i32_to_float( of, o ); + stbir__simdf8_mult( of, of, STBIR_max_uint16_as_float_inverted8); + stbir__decode_simdf8_flip( of ); + stbir__simdf8_store( decode + 0, of ); + #else + stbir__simdi i, o0, o1; + stbir__simdf of0, of1; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi_expand_u16_to_u32( o0,o1,i ); + stbir__simdi_convert_i32_to_float( of0, o0 ); + stbir__simdi_convert_i32_to_float( of1, o1 ); + stbir__simdf_mult( of0, of0, STBIR__CONSTF(STBIR_max_uint16_as_float_inverted) ); + stbir__simdf_mult( of1, of1, STBIR__CONSTF(STBIR_max_uint16_as_float_inverted)); + stbir__decode_simdf4_flip( of0 ); + stbir__decode_simdf4_flip( of1 ); + stbir__simdf_store( decode + 0, of0 ); + stbir__simdf_store( decode + 4, of1 ); + #endif + decode += 8; + input += 8; + if ( decode <= decode_end ) + continue; + if ( decode == ( decode_end + 8 ) ) + break; + decode = decode_end; // backup and do last couple + input = end_input_m8; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode <= decode_end ) + { + STBIR_SIMD_NO_UNROLL(decode); + decode[0-4] = ((float)(input[stbir__decode_order0])) * stbir__max_uint16_as_float_inverted; + decode[1-4] = ((float)(input[stbir__decode_order1])) * stbir__max_uint16_as_float_inverted; + decode[2-4] = ((float)(input[stbir__decode_order2])) * stbir__max_uint16_as_float_inverted; + decode[3-4] = ((float)(input[stbir__decode_order3])) * stbir__max_uint16_as_float_inverted; + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = ((float)(input[stbir__decode_order0])) * stbir__max_uint16_as_float_inverted; + #if stbir__coder_min_num >= 2 + decode[1] = ((float)(input[stbir__decode_order1])) * stbir__max_uint16_as_float_inverted; + #endif + #if stbir__coder_min_num >= 3 + decode[2] = ((float)(input[stbir__decode_order2])) * stbir__max_uint16_as_float_inverted; + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif +} + + +static void STBIR__CODER_NAME(stbir__encode_uint16_linear_scaled)( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned short STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned short*) outputp; + unsigned short * end_output = ( (unsigned short*) output ) + width_times_channels; + + #ifdef STBIR_SIMD + { + if ( width_times_channels >= stbir__simdfX_float_count*2 ) + { + float const * end_encode_m8 = encode + width_times_channels - stbir__simdfX_float_count*2; + end_output -= stbir__simdfX_float_count*2; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdfX e0, e1; + stbir__simdiX i; + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdfX_madd_mem( e0, STBIR_simd_point5X, STBIR_max_uint16_as_floatX, encode ); + stbir__simdfX_madd_mem( e1, STBIR_simd_point5X, STBIR_max_uint16_as_floatX, encode+stbir__simdfX_float_count ); + stbir__encode_simdfX_unflip( e0 ); + stbir__encode_simdfX_unflip( e1 ); + stbir__simdfX_pack_to_words( i, e0, e1 ); + stbir__simdiX_store( output, i ); + encode += stbir__simdfX_float_count*2; + output += stbir__simdfX_float_count*2; + if ( output <= end_output ) + continue; + if ( output == ( end_output + stbir__simdfX_float_count*2 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m8; + } + return; + } + } + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + stbir__simdf e; + stbir__simdi i; + STBIR_NO_UNROLL(encode); + stbir__simdf_load( e, encode ); + stbir__simdf_madd( e, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint16_as_float), e ); + stbir__encode_simdf4_unflip( e ); + stbir__simdf_pack_to_8words( i, e, e ); // only use first 4 + stbir__simdi_store2( output-4, i ); + output += 4; + encode += 4; + } + output -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + stbir__simdf e; + STBIR_NO_UNROLL(encode); + stbir__simdf_madd1_mem( e, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint16_as_float), encode+stbir__encode_order0 ); output[0] = stbir__simdf_convert_float_to_short( e ); + #if stbir__coder_min_num >= 2 + stbir__simdf_madd1_mem( e, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint16_as_float), encode+stbir__encode_order1 ); output[1] = stbir__simdf_convert_float_to_short( e ); + #endif + #if stbir__coder_min_num >= 3 + stbir__simdf_madd1_mem( e, STBIR__CONSTF(STBIR_simd_point5), STBIR__CONSTF(STBIR_max_uint16_as_float), encode+stbir__encode_order2 ); output[2] = stbir__simdf_convert_float_to_short( e ); + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif + + #else + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + float f; + STBIR_SIMD_NO_UNROLL(encode); + f = encode[stbir__encode_order0] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[0-4] = (unsigned short)f; + f = encode[stbir__encode_order1] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[1-4] = (unsigned short)f; + f = encode[stbir__encode_order2] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[2-4] = (unsigned short)f; + f = encode[stbir__encode_order3] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[3-4] = (unsigned short)f; + output += 4; + encode += 4; + } + output -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + float f; + STBIR_NO_UNROLL(encode); + f = encode[stbir__encode_order0] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[0] = (unsigned short)f; + #if stbir__coder_min_num >= 2 + f = encode[stbir__encode_order1] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[1] = (unsigned short)f; + #endif + #if stbir__coder_min_num >= 3 + f = encode[stbir__encode_order2] * stbir__max_uint16_as_float + 0.5f; STBIR_CLAMP(f, 0, 65535); output[2] = (unsigned short)f; + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif + #endif +} + +static void STBIR__CODER_NAME(stbir__decode_uint16_linear)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float * decode_end = (float*) decode + width_times_channels; + unsigned short const * input = (unsigned short const *)inputp; + + #ifdef STBIR_SIMD + unsigned short const * end_input_m8 = input + width_times_channels - 8; + if ( width_times_channels >= 8 ) + { + decode_end -= 8; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + #ifdef STBIR_SIMD8 + stbir__simdi i; stbir__simdi8 o; + stbir__simdf8 of; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi8_expand_u16_to_u32( o, i ); + stbir__simdi8_convert_i32_to_float( of, o ); + stbir__decode_simdf8_flip( of ); + stbir__simdf8_store( decode + 0, of ); + #else + stbir__simdi i, o0, o1; + stbir__simdf of0, of1; + STBIR_NO_UNROLL(decode); + stbir__simdi_load( i, input ); + stbir__simdi_expand_u16_to_u32( o0, o1, i ); + stbir__simdi_convert_i32_to_float( of0, o0 ); + stbir__simdi_convert_i32_to_float( of1, o1 ); + stbir__decode_simdf4_flip( of0 ); + stbir__decode_simdf4_flip( of1 ); + stbir__simdf_store( decode + 0, of0 ); + stbir__simdf_store( decode + 4, of1 ); + #endif + decode += 8; + input += 8; + if ( decode <= decode_end ) + continue; + if ( decode == ( decode_end + 8 ) ) + break; + decode = decode_end; // backup and do last couple + input = end_input_m8; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode <= decode_end ) + { + STBIR_SIMD_NO_UNROLL(decode); + decode[0-4] = ((float)(input[stbir__decode_order0])); + decode[1-4] = ((float)(input[stbir__decode_order1])); + decode[2-4] = ((float)(input[stbir__decode_order2])); + decode[3-4] = ((float)(input[stbir__decode_order3])); + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = ((float)(input[stbir__decode_order0])); + #if stbir__coder_min_num >= 2 + decode[1] = ((float)(input[stbir__decode_order1])); + #endif + #if stbir__coder_min_num >= 3 + decode[2] = ((float)(input[stbir__decode_order2])); + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME(stbir__encode_uint16_linear)( void * outputp, int width_times_channels, float const * encode ) +{ + unsigned short STBIR_SIMD_STREAMOUT_PTR( * ) output = (unsigned short*) outputp; + unsigned short * end_output = ( (unsigned short*) output ) + width_times_channels; + + #ifdef STBIR_SIMD + { + if ( width_times_channels >= stbir__simdfX_float_count*2 ) + { + float const * end_encode_m8 = encode + width_times_channels - stbir__simdfX_float_count*2; + end_output -= stbir__simdfX_float_count*2; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdfX e0, e1; + stbir__simdiX i; + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdfX_add_mem( e0, STBIR_simd_point5X, encode ); + stbir__simdfX_add_mem( e1, STBIR_simd_point5X, encode+stbir__simdfX_float_count ); + stbir__encode_simdfX_unflip( e0 ); + stbir__encode_simdfX_unflip( e1 ); + stbir__simdfX_pack_to_words( i, e0, e1 ); + stbir__simdiX_store( output, i ); + encode += stbir__simdfX_float_count*2; + output += stbir__simdfX_float_count*2; + if ( output <= end_output ) + continue; + if ( output == ( end_output + stbir__simdfX_float_count*2 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m8; + } + return; + } + } + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + stbir__simdf e; + stbir__simdi i; + STBIR_NO_UNROLL(encode); + stbir__simdf_load( e, encode ); + stbir__simdf_add( e, STBIR__CONSTF(STBIR_simd_point5), e ); + stbir__encode_simdf4_unflip( e ); + stbir__simdf_pack_to_8words( i, e, e ); // only use first 4 + stbir__simdi_store2( output-4, i ); + output += 4; + encode += 4; + } + output -= 4; + #endif + + #else + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + float f; + STBIR_SIMD_NO_UNROLL(encode); + f = encode[stbir__encode_order0] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[0-4] = (unsigned short)f; + f = encode[stbir__encode_order1] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[1-4] = (unsigned short)f; + f = encode[stbir__encode_order2] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[2-4] = (unsigned short)f; + f = encode[stbir__encode_order3] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[3-4] = (unsigned short)f; + output += 4; + encode += 4; + } + output -= 4; + #endif + + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + float f; + STBIR_NO_UNROLL(encode); + f = encode[stbir__encode_order0] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[0] = (unsigned short)f; + #if stbir__coder_min_num >= 2 + f = encode[stbir__encode_order1] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[1] = (unsigned short)f; + #endif + #if stbir__coder_min_num >= 3 + f = encode[stbir__encode_order2] + 0.5f; STBIR_CLAMP(f, 0, 65535); output[2] = (unsigned short)f; + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME(stbir__decode_half_float_linear)( float * decodep, int width_times_channels, void const * inputp ) +{ + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float * decode_end = (float*) decode + width_times_channels; + stbir__FP16 const * input = (stbir__FP16 const *)inputp; + + #ifdef STBIR_SIMD + if ( width_times_channels >= 8 ) + { + stbir__FP16 const * end_input_m8 = input + width_times_channels - 8; + decode_end -= 8; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + STBIR_NO_UNROLL(decode); + + stbir__half_to_float_SIMD( decode, input ); + #ifdef stbir__decode_swizzle + #ifdef STBIR_SIMD8 + { + stbir__simdf8 of; + stbir__simdf8_load( of, decode ); + stbir__decode_simdf8_flip( of ); + stbir__simdf8_store( decode, of ); + } + #else + { + stbir__simdf of0,of1; + stbir__simdf_load( of0, decode ); + stbir__simdf_load( of1, decode+4 ); + stbir__decode_simdf4_flip( of0 ); + stbir__decode_simdf4_flip( of1 ); + stbir__simdf_store( decode, of0 ); + stbir__simdf_store( decode+4, of1 ); + } + #endif + #endif + decode += 8; + input += 8; + if ( decode <= decode_end ) + continue; + if ( decode == ( decode_end + 8 ) ) + break; + decode = decode_end; // backup and do last couple + input = end_input_m8; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode <= decode_end ) + { + STBIR_SIMD_NO_UNROLL(decode); + decode[0-4] = stbir__half_to_float(input[stbir__decode_order0]); + decode[1-4] = stbir__half_to_float(input[stbir__decode_order1]); + decode[2-4] = stbir__half_to_float(input[stbir__decode_order2]); + decode[3-4] = stbir__half_to_float(input[stbir__decode_order3]); + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = stbir__half_to_float(input[stbir__decode_order0]); + #if stbir__coder_min_num >= 2 + decode[1] = stbir__half_to_float(input[stbir__decode_order1]); + #endif + #if stbir__coder_min_num >= 3 + decode[2] = stbir__half_to_float(input[stbir__decode_order2]); + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME( stbir__encode_half_float_linear )( void * outputp, int width_times_channels, float const * encode ) +{ + stbir__FP16 STBIR_SIMD_STREAMOUT_PTR( * ) output = (stbir__FP16*) outputp; + stbir__FP16 * end_output = ( (stbir__FP16*) output ) + width_times_channels; + + #ifdef STBIR_SIMD + if ( width_times_channels >= 8 ) + { + float const * end_encode_m8 = encode + width_times_channels - 8; + end_output -= 8; + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + STBIR_SIMD_NO_UNROLL(encode); + #ifdef stbir__decode_swizzle + #ifdef STBIR_SIMD8 + { + stbir__simdf8 of; + stbir__simdf8_load( of, encode ); + stbir__encode_simdf8_unflip( of ); + stbir__float_to_half_SIMD( output, (float*)&of ); + } + #else + { + stbir__simdf of[2]; + stbir__simdf_load( of[0], encode ); + stbir__simdf_load( of[1], encode+4 ); + stbir__encode_simdf4_unflip( of[0] ); + stbir__encode_simdf4_unflip( of[1] ); + stbir__float_to_half_SIMD( output, (float*)of ); + } + #endif + #else + stbir__float_to_half_SIMD( output, encode ); + #endif + encode += 8; + output += 8; + if ( output <= end_output ) + continue; + if ( output == ( end_output + 8 ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m8; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + STBIR_SIMD_NO_UNROLL(output); + output[0-4] = stbir__float_to_half(encode[stbir__encode_order0]); + output[1-4] = stbir__float_to_half(encode[stbir__encode_order1]); + output[2-4] = stbir__float_to_half(encode[stbir__encode_order2]); + output[3-4] = stbir__float_to_half(encode[stbir__encode_order3]); + output += 4; + encode += 4; + } + output -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + STBIR_NO_UNROLL(output); + output[0] = stbir__float_to_half(encode[stbir__encode_order0]); + #if stbir__coder_min_num >= 2 + output[1] = stbir__float_to_half(encode[stbir__encode_order1]); + #endif + #if stbir__coder_min_num >= 3 + output[2] = stbir__float_to_half(encode[stbir__encode_order2]); + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif +} + +static void STBIR__CODER_NAME(stbir__decode_float_linear)( float * decodep, int width_times_channels, void const * inputp ) +{ + #ifdef stbir__decode_swizzle + float STBIR_STREAMOUT_PTR( * ) decode = decodep; + float * decode_end = (float*) decode + width_times_channels; + float const * input = (float const *)inputp; + + #ifdef STBIR_SIMD + if ( width_times_channels >= 16 ) + { + float const * end_input_m16 = input + width_times_channels - 16; + decode_end -= 16; + STBIR_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + STBIR_NO_UNROLL(decode); + #ifdef stbir__decode_swizzle + #ifdef STBIR_SIMD8 + { + stbir__simdf8 of0,of1; + stbir__simdf8_load( of0, input ); + stbir__simdf8_load( of1, input+8 ); + stbir__decode_simdf8_flip( of0 ); + stbir__decode_simdf8_flip( of1 ); + stbir__simdf8_store( decode, of0 ); + stbir__simdf8_store( decode+8, of1 ); + } + #else + { + stbir__simdf of0,of1,of2,of3; + stbir__simdf_load( of0, input ); + stbir__simdf_load( of1, input+4 ); + stbir__simdf_load( of2, input+8 ); + stbir__simdf_load( of3, input+12 ); + stbir__decode_simdf4_flip( of0 ); + stbir__decode_simdf4_flip( of1 ); + stbir__decode_simdf4_flip( of2 ); + stbir__decode_simdf4_flip( of3 ); + stbir__simdf_store( decode, of0 ); + stbir__simdf_store( decode+4, of1 ); + stbir__simdf_store( decode+8, of2 ); + stbir__simdf_store( decode+12, of3 ); + } + #endif + #endif + decode += 16; + input += 16; + if ( decode <= decode_end ) + continue; + if ( decode == ( decode_end + 16 ) ) + break; + decode = decode_end; // backup and do last couple + input = end_input_m16; + } + return; + } + #endif + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + decode += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( decode <= decode_end ) + { + STBIR_SIMD_NO_UNROLL(decode); + decode[0-4] = input[stbir__decode_order0]; + decode[1-4] = input[stbir__decode_order1]; + decode[2-4] = input[stbir__decode_order2]; + decode[3-4] = input[stbir__decode_order3]; + decode += 4; + input += 4; + } + decode -= 4; + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( decode < decode_end ) + { + STBIR_NO_UNROLL(decode); + decode[0] = input[stbir__decode_order0]; + #if stbir__coder_min_num >= 2 + decode[1] = input[stbir__decode_order1]; + #endif + #if stbir__coder_min_num >= 3 + decode[2] = input[stbir__decode_order2]; + #endif + decode += stbir__coder_min_num; + input += stbir__coder_min_num; + } + #endif + + #else + + if ( (void*)decodep != inputp ) + STBIR_MEMCPY( decodep, inputp, width_times_channels * sizeof( float ) ); + + #endif +} + +static void STBIR__CODER_NAME( stbir__encode_float_linear )( void * outputp, int width_times_channels, float const * encode ) +{ + #if !defined( STBIR_FLOAT_HIGH_CLAMP ) && !defined(STBIR_FLOAT_LO_CLAMP) && !defined(stbir__decode_swizzle) + + if ( (void*)outputp != (void*) encode ) + STBIR_MEMCPY( outputp, encode, width_times_channels * sizeof( float ) ); + + #else + + float STBIR_SIMD_STREAMOUT_PTR( * ) output = (float*) outputp; + float * end_output = ( (float*) output ) + width_times_channels; + + #ifdef STBIR_FLOAT_HIGH_CLAMP + #define stbir_scalar_hi_clamp( v ) if ( v > STBIR_FLOAT_HIGH_CLAMP ) v = STBIR_FLOAT_HIGH_CLAMP; + #else + #define stbir_scalar_hi_clamp( v ) + #endif + #ifdef STBIR_FLOAT_LOW_CLAMP + #define stbir_scalar_lo_clamp( v ) if ( v < STBIR_FLOAT_LOW_CLAMP ) v = STBIR_FLOAT_LOW_CLAMP; + #else + #define stbir_scalar_lo_clamp( v ) + #endif + + #ifdef STBIR_SIMD + + #ifdef STBIR_FLOAT_HIGH_CLAMP + const stbir__simdfX high_clamp = stbir__simdf_frepX(STBIR_FLOAT_HIGH_CLAMP); + #endif + #ifdef STBIR_FLOAT_LOW_CLAMP + const stbir__simdfX low_clamp = stbir__simdf_frepX(STBIR_FLOAT_LOW_CLAMP); + #endif + + if ( width_times_channels >= ( stbir__simdfX_float_count * 2 ) ) + { + float const * end_encode_m8 = encode + width_times_channels - ( stbir__simdfX_float_count * 2 ); + end_output -= ( stbir__simdfX_float_count * 2 ); + STBIR_SIMD_NO_UNROLL_LOOP_START_INF_FOR + for(;;) + { + stbir__simdfX e0, e1; + STBIR_SIMD_NO_UNROLL(encode); + stbir__simdfX_load( e0, encode ); + stbir__simdfX_load( e1, encode+stbir__simdfX_float_count ); +#ifdef STBIR_FLOAT_HIGH_CLAMP + stbir__simdfX_min( e0, e0, high_clamp ); + stbir__simdfX_min( e1, e1, high_clamp ); +#endif +#ifdef STBIR_FLOAT_LOW_CLAMP + stbir__simdfX_max( e0, e0, low_clamp ); + stbir__simdfX_max( e1, e1, low_clamp ); +#endif + stbir__encode_simdfX_unflip( e0 ); + stbir__encode_simdfX_unflip( e1 ); + stbir__simdfX_store( output, e0 ); + stbir__simdfX_store( output+stbir__simdfX_float_count, e1 ); + encode += stbir__simdfX_float_count * 2; + output += stbir__simdfX_float_count * 2; + if ( output < end_output ) + continue; + if ( output == ( end_output + ( stbir__simdfX_float_count * 2 ) ) ) + break; + output = end_output; // backup and do last couple + encode = end_encode_m8; + } + return; + } + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + stbir__simdf e0; + STBIR_NO_UNROLL(encode); + stbir__simdf_load( e0, encode ); +#ifdef STBIR_FLOAT_HIGH_CLAMP + stbir__simdf_min( e0, e0, high_clamp ); +#endif +#ifdef STBIR_FLOAT_LOW_CLAMP + stbir__simdf_max( e0, e0, low_clamp ); +#endif + stbir__encode_simdf4_unflip( e0 ); + stbir__simdf_store( output-4, e0 ); + output += 4; + encode += 4; + } + output -= 4; + #endif + + #else + + // try to do blocks of 4 when you can + #if stbir__coder_min_num != 3 // doesn't divide cleanly by four + output += 4; + STBIR_SIMD_NO_UNROLL_LOOP_START + while( output <= end_output ) + { + float e; + STBIR_SIMD_NO_UNROLL(encode); + e = encode[ stbir__encode_order0 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[0-4] = e; + e = encode[ stbir__encode_order1 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[1-4] = e; + e = encode[ stbir__encode_order2 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[2-4] = e; + e = encode[ stbir__encode_order3 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[3-4] = e; + output += 4; + encode += 4; + } + output -= 4; + + #endif + + #endif + + // do the remnants + #if stbir__coder_min_num < 4 + STBIR_NO_UNROLL_LOOP_START + while( output < end_output ) + { + float e; + STBIR_NO_UNROLL(encode); + e = encode[ stbir__encode_order0 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[0] = e; + #if stbir__coder_min_num >= 2 + e = encode[ stbir__encode_order1 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[1] = e; + #endif + #if stbir__coder_min_num >= 3 + e = encode[ stbir__encode_order2 ]; stbir_scalar_hi_clamp( e ); stbir_scalar_lo_clamp( e ); output[2] = e; + #endif + output += stbir__coder_min_num; + encode += stbir__coder_min_num; + } + #endif + + #endif +} + +#undef stbir__decode_suffix +#undef stbir__decode_simdf8_flip +#undef stbir__decode_simdf4_flip +#undef stbir__decode_order0 +#undef stbir__decode_order1 +#undef stbir__decode_order2 +#undef stbir__decode_order3 +#undef stbir__encode_order0 +#undef stbir__encode_order1 +#undef stbir__encode_order2 +#undef stbir__encode_order3 +#undef stbir__encode_simdf8_unflip +#undef stbir__encode_simdf4_unflip +#undef stbir__encode_simdfX_unflip +#undef STBIR__CODER_NAME +#undef stbir__coder_min_num +#undef stbir__decode_swizzle +#undef stbir_scalar_hi_clamp +#undef stbir_scalar_lo_clamp +#undef STB_IMAGE_RESIZE_DO_CODERS + +#elif defined( STB_IMAGE_RESIZE_DO_VERTICALS) + +#ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#define STBIR_chans( start, end ) STBIR_strs_join14(start,STBIR__vertical_channels,end,_cont) +#else +#define STBIR_chans( start, end ) STBIR_strs_join1(start,STBIR__vertical_channels,end) +#endif + +#if STBIR__vertical_channels >= 1 +#define stbIF0( code ) code +#else +#define stbIF0( code ) +#endif +#if STBIR__vertical_channels >= 2 +#define stbIF1( code ) code +#else +#define stbIF1( code ) +#endif +#if STBIR__vertical_channels >= 3 +#define stbIF2( code ) code +#else +#define stbIF2( code ) +#endif +#if STBIR__vertical_channels >= 4 +#define stbIF3( code ) code +#else +#define stbIF3( code ) +#endif +#if STBIR__vertical_channels >= 5 +#define stbIF4( code ) code +#else +#define stbIF4( code ) +#endif +#if STBIR__vertical_channels >= 6 +#define stbIF5( code ) code +#else +#define stbIF5( code ) +#endif +#if STBIR__vertical_channels >= 7 +#define stbIF6( code ) code +#else +#define stbIF6( code ) +#endif +#if STBIR__vertical_channels >= 8 +#define stbIF7( code ) code +#else +#define stbIF7( code ) +#endif + +static void STBIR_chans( stbir__vertical_scatter_with_,_coeffs)( float ** outputs, float const * vertical_coefficients, float const * input, float const * input_end ) +{ + stbIF0( float STBIR_SIMD_STREAMOUT_PTR( * ) output0 = outputs[0]; float c0s = vertical_coefficients[0]; ) + stbIF1( float STBIR_SIMD_STREAMOUT_PTR( * ) output1 = outputs[1]; float c1s = vertical_coefficients[1]; ) + stbIF2( float STBIR_SIMD_STREAMOUT_PTR( * ) output2 = outputs[2]; float c2s = vertical_coefficients[2]; ) + stbIF3( float STBIR_SIMD_STREAMOUT_PTR( * ) output3 = outputs[3]; float c3s = vertical_coefficients[3]; ) + stbIF4( float STBIR_SIMD_STREAMOUT_PTR( * ) output4 = outputs[4]; float c4s = vertical_coefficients[4]; ) + stbIF5( float STBIR_SIMD_STREAMOUT_PTR( * ) output5 = outputs[5]; float c5s = vertical_coefficients[5]; ) + stbIF6( float STBIR_SIMD_STREAMOUT_PTR( * ) output6 = outputs[6]; float c6s = vertical_coefficients[6]; ) + stbIF7( float STBIR_SIMD_STREAMOUT_PTR( * ) output7 = outputs[7]; float c7s = vertical_coefficients[7]; ) + + #ifdef STBIR_SIMD + { + stbIF0(stbir__simdfX c0 = stbir__simdf_frepX( c0s ); ) + stbIF1(stbir__simdfX c1 = stbir__simdf_frepX( c1s ); ) + stbIF2(stbir__simdfX c2 = stbir__simdf_frepX( c2s ); ) + stbIF3(stbir__simdfX c3 = stbir__simdf_frepX( c3s ); ) + stbIF4(stbir__simdfX c4 = stbir__simdf_frepX( c4s ); ) + stbIF5(stbir__simdfX c5 = stbir__simdf_frepX( c5s ); ) + stbIF6(stbir__simdfX c6 = stbir__simdf_frepX( c6s ); ) + stbIF7(stbir__simdfX c7 = stbir__simdf_frepX( c7s ); ) + STBIR_SIMD_NO_UNROLL_LOOP_START + while ( ( (char*)input_end - (char*) input ) >= (16*stbir__simdfX_float_count) ) + { + stbir__simdfX o0, o1, o2, o3, r0, r1, r2, r3; + STBIR_SIMD_NO_UNROLL(output0); + + stbir__simdfX_load( r0, input ); stbir__simdfX_load( r1, input+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input+(3*stbir__simdfX_float_count) ); + + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( stbir__simdfX_load( o0, output0 ); stbir__simdfX_load( o1, output0+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output0+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output0+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c0 ); stbir__simdfX_madd( o1, o1, r1, c0 ); stbir__simdfX_madd( o2, o2, r2, c0 ); stbir__simdfX_madd( o3, o3, r3, c0 ); + stbir__simdfX_store( output0, o0 ); stbir__simdfX_store( output0+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output0+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output0+(3*stbir__simdfX_float_count), o3 ); ) + stbIF1( stbir__simdfX_load( o0, output1 ); stbir__simdfX_load( o1, output1+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output1+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output1+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c1 ); stbir__simdfX_madd( o1, o1, r1, c1 ); stbir__simdfX_madd( o2, o2, r2, c1 ); stbir__simdfX_madd( o3, o3, r3, c1 ); + stbir__simdfX_store( output1, o0 ); stbir__simdfX_store( output1+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output1+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output1+(3*stbir__simdfX_float_count), o3 ); ) + stbIF2( stbir__simdfX_load( o0, output2 ); stbir__simdfX_load( o1, output2+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output2+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output2+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c2 ); stbir__simdfX_madd( o1, o1, r1, c2 ); stbir__simdfX_madd( o2, o2, r2, c2 ); stbir__simdfX_madd( o3, o3, r3, c2 ); + stbir__simdfX_store( output2, o0 ); stbir__simdfX_store( output2+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output2+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output2+(3*stbir__simdfX_float_count), o3 ); ) + stbIF3( stbir__simdfX_load( o0, output3 ); stbir__simdfX_load( o1, output3+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output3+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output3+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c3 ); stbir__simdfX_madd( o1, o1, r1, c3 ); stbir__simdfX_madd( o2, o2, r2, c3 ); stbir__simdfX_madd( o3, o3, r3, c3 ); + stbir__simdfX_store( output3, o0 ); stbir__simdfX_store( output3+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output3+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output3+(3*stbir__simdfX_float_count), o3 ); ) + stbIF4( stbir__simdfX_load( o0, output4 ); stbir__simdfX_load( o1, output4+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output4+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output4+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c4 ); stbir__simdfX_madd( o1, o1, r1, c4 ); stbir__simdfX_madd( o2, o2, r2, c4 ); stbir__simdfX_madd( o3, o3, r3, c4 ); + stbir__simdfX_store( output4, o0 ); stbir__simdfX_store( output4+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output4+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output4+(3*stbir__simdfX_float_count), o3 ); ) + stbIF5( stbir__simdfX_load( o0, output5 ); stbir__simdfX_load( o1, output5+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output5+(2*stbir__simdfX_float_count)); stbir__simdfX_load( o3, output5+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c5 ); stbir__simdfX_madd( o1, o1, r1, c5 ); stbir__simdfX_madd( o2, o2, r2, c5 ); stbir__simdfX_madd( o3, o3, r3, c5 ); + stbir__simdfX_store( output5, o0 ); stbir__simdfX_store( output5+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output5+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output5+(3*stbir__simdfX_float_count), o3 ); ) + stbIF6( stbir__simdfX_load( o0, output6 ); stbir__simdfX_load( o1, output6+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output6+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output6+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c6 ); stbir__simdfX_madd( o1, o1, r1, c6 ); stbir__simdfX_madd( o2, o2, r2, c6 ); stbir__simdfX_madd( o3, o3, r3, c6 ); + stbir__simdfX_store( output6, o0 ); stbir__simdfX_store( output6+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output6+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output6+(3*stbir__simdfX_float_count), o3 ); ) + stbIF7( stbir__simdfX_load( o0, output7 ); stbir__simdfX_load( o1, output7+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output7+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output7+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c7 ); stbir__simdfX_madd( o1, o1, r1, c7 ); stbir__simdfX_madd( o2, o2, r2, c7 ); stbir__simdfX_madd( o3, o3, r3, c7 ); + stbir__simdfX_store( output7, o0 ); stbir__simdfX_store( output7+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output7+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output7+(3*stbir__simdfX_float_count), o3 ); ) + #else + stbIF0( stbir__simdfX_mult( o0, r0, c0 ); stbir__simdfX_mult( o1, r1, c0 ); stbir__simdfX_mult( o2, r2, c0 ); stbir__simdfX_mult( o3, r3, c0 ); + stbir__simdfX_store( output0, o0 ); stbir__simdfX_store( output0+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output0+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output0+(3*stbir__simdfX_float_count), o3 ); ) + stbIF1( stbir__simdfX_mult( o0, r0, c1 ); stbir__simdfX_mult( o1, r1, c1 ); stbir__simdfX_mult( o2, r2, c1 ); stbir__simdfX_mult( o3, r3, c1 ); + stbir__simdfX_store( output1, o0 ); stbir__simdfX_store( output1+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output1+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output1+(3*stbir__simdfX_float_count), o3 ); ) + stbIF2( stbir__simdfX_mult( o0, r0, c2 ); stbir__simdfX_mult( o1, r1, c2 ); stbir__simdfX_mult( o2, r2, c2 ); stbir__simdfX_mult( o3, r3, c2 ); + stbir__simdfX_store( output2, o0 ); stbir__simdfX_store( output2+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output2+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output2+(3*stbir__simdfX_float_count), o3 ); ) + stbIF3( stbir__simdfX_mult( o0, r0, c3 ); stbir__simdfX_mult( o1, r1, c3 ); stbir__simdfX_mult( o2, r2, c3 ); stbir__simdfX_mult( o3, r3, c3 ); + stbir__simdfX_store( output3, o0 ); stbir__simdfX_store( output3+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output3+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output3+(3*stbir__simdfX_float_count), o3 ); ) + stbIF4( stbir__simdfX_mult( o0, r0, c4 ); stbir__simdfX_mult( o1, r1, c4 ); stbir__simdfX_mult( o2, r2, c4 ); stbir__simdfX_mult( o3, r3, c4 ); + stbir__simdfX_store( output4, o0 ); stbir__simdfX_store( output4+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output4+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output4+(3*stbir__simdfX_float_count), o3 ); ) + stbIF5( stbir__simdfX_mult( o0, r0, c5 ); stbir__simdfX_mult( o1, r1, c5 ); stbir__simdfX_mult( o2, r2, c5 ); stbir__simdfX_mult( o3, r3, c5 ); + stbir__simdfX_store( output5, o0 ); stbir__simdfX_store( output5+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output5+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output5+(3*stbir__simdfX_float_count), o3 ); ) + stbIF6( stbir__simdfX_mult( o0, r0, c6 ); stbir__simdfX_mult( o1, r1, c6 ); stbir__simdfX_mult( o2, r2, c6 ); stbir__simdfX_mult( o3, r3, c6 ); + stbir__simdfX_store( output6, o0 ); stbir__simdfX_store( output6+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output6+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output6+(3*stbir__simdfX_float_count), o3 ); ) + stbIF7( stbir__simdfX_mult( o0, r0, c7 ); stbir__simdfX_mult( o1, r1, c7 ); stbir__simdfX_mult( o2, r2, c7 ); stbir__simdfX_mult( o3, r3, c7 ); + stbir__simdfX_store( output7, o0 ); stbir__simdfX_store( output7+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output7+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output7+(3*stbir__simdfX_float_count), o3 ); ) + #endif + + input += (4*stbir__simdfX_float_count); + stbIF0( output0 += (4*stbir__simdfX_float_count); ) stbIF1( output1 += (4*stbir__simdfX_float_count); ) stbIF2( output2 += (4*stbir__simdfX_float_count); ) stbIF3( output3 += (4*stbir__simdfX_float_count); ) stbIF4( output4 += (4*stbir__simdfX_float_count); ) stbIF5( output5 += (4*stbir__simdfX_float_count); ) stbIF6( output6 += (4*stbir__simdfX_float_count); ) stbIF7( output7 += (4*stbir__simdfX_float_count); ) + } + STBIR_SIMD_NO_UNROLL_LOOP_START + while ( ( (char*)input_end - (char*) input ) >= 16 ) + { + stbir__simdf o0, r0; + STBIR_SIMD_NO_UNROLL(output0); + + stbir__simdf_load( r0, input ); + + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( stbir__simdf_load( o0, output0 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c0 ) ); stbir__simdf_store( output0, o0 ); ) + stbIF1( stbir__simdf_load( o0, output1 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c1 ) ); stbir__simdf_store( output1, o0 ); ) + stbIF2( stbir__simdf_load( o0, output2 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c2 ) ); stbir__simdf_store( output2, o0 ); ) + stbIF3( stbir__simdf_load( o0, output3 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c3 ) ); stbir__simdf_store( output3, o0 ); ) + stbIF4( stbir__simdf_load( o0, output4 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c4 ) ); stbir__simdf_store( output4, o0 ); ) + stbIF5( stbir__simdf_load( o0, output5 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c5 ) ); stbir__simdf_store( output5, o0 ); ) + stbIF6( stbir__simdf_load( o0, output6 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c6 ) ); stbir__simdf_store( output6, o0 ); ) + stbIF7( stbir__simdf_load( o0, output7 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c7 ) ); stbir__simdf_store( output7, o0 ); ) + #else + stbIF0( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c0 ) ); stbir__simdf_store( output0, o0 ); ) + stbIF1( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c1 ) ); stbir__simdf_store( output1, o0 ); ) + stbIF2( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c2 ) ); stbir__simdf_store( output2, o0 ); ) + stbIF3( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c3 ) ); stbir__simdf_store( output3, o0 ); ) + stbIF4( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c4 ) ); stbir__simdf_store( output4, o0 ); ) + stbIF5( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c5 ) ); stbir__simdf_store( output5, o0 ); ) + stbIF6( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c6 ) ); stbir__simdf_store( output6, o0 ); ) + stbIF7( stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c7 ) ); stbir__simdf_store( output7, o0 ); ) + #endif + + input += 4; + stbIF0( output0 += 4; ) stbIF1( output1 += 4; ) stbIF2( output2 += 4; ) stbIF3( output3 += 4; ) stbIF4( output4 += 4; ) stbIF5( output5 += 4; ) stbIF6( output6 += 4; ) stbIF7( output7 += 4; ) + } + } + #else + STBIR_NO_UNROLL_LOOP_START + while ( ( (char*)input_end - (char*) input ) >= 16 ) + { + float r0, r1, r2, r3; + STBIR_NO_UNROLL(input); + + r0 = input[0], r1 = input[1], r2 = input[2], r3 = input[3]; + + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( output0[0] += ( r0 * c0s ); output0[1] += ( r1 * c0s ); output0[2] += ( r2 * c0s ); output0[3] += ( r3 * c0s ); ) + stbIF1( output1[0] += ( r0 * c1s ); output1[1] += ( r1 * c1s ); output1[2] += ( r2 * c1s ); output1[3] += ( r3 * c1s ); ) + stbIF2( output2[0] += ( r0 * c2s ); output2[1] += ( r1 * c2s ); output2[2] += ( r2 * c2s ); output2[3] += ( r3 * c2s ); ) + stbIF3( output3[0] += ( r0 * c3s ); output3[1] += ( r1 * c3s ); output3[2] += ( r2 * c3s ); output3[3] += ( r3 * c3s ); ) + stbIF4( output4[0] += ( r0 * c4s ); output4[1] += ( r1 * c4s ); output4[2] += ( r2 * c4s ); output4[3] += ( r3 * c4s ); ) + stbIF5( output5[0] += ( r0 * c5s ); output5[1] += ( r1 * c5s ); output5[2] += ( r2 * c5s ); output5[3] += ( r3 * c5s ); ) + stbIF6( output6[0] += ( r0 * c6s ); output6[1] += ( r1 * c6s ); output6[2] += ( r2 * c6s ); output6[3] += ( r3 * c6s ); ) + stbIF7( output7[0] += ( r0 * c7s ); output7[1] += ( r1 * c7s ); output7[2] += ( r2 * c7s ); output7[3] += ( r3 * c7s ); ) + #else + stbIF0( output0[0] = ( r0 * c0s ); output0[1] = ( r1 * c0s ); output0[2] = ( r2 * c0s ); output0[3] = ( r3 * c0s ); ) + stbIF1( output1[0] = ( r0 * c1s ); output1[1] = ( r1 * c1s ); output1[2] = ( r2 * c1s ); output1[3] = ( r3 * c1s ); ) + stbIF2( output2[0] = ( r0 * c2s ); output2[1] = ( r1 * c2s ); output2[2] = ( r2 * c2s ); output2[3] = ( r3 * c2s ); ) + stbIF3( output3[0] = ( r0 * c3s ); output3[1] = ( r1 * c3s ); output3[2] = ( r2 * c3s ); output3[3] = ( r3 * c3s ); ) + stbIF4( output4[0] = ( r0 * c4s ); output4[1] = ( r1 * c4s ); output4[2] = ( r2 * c4s ); output4[3] = ( r3 * c4s ); ) + stbIF5( output5[0] = ( r0 * c5s ); output5[1] = ( r1 * c5s ); output5[2] = ( r2 * c5s ); output5[3] = ( r3 * c5s ); ) + stbIF6( output6[0] = ( r0 * c6s ); output6[1] = ( r1 * c6s ); output6[2] = ( r2 * c6s ); output6[3] = ( r3 * c6s ); ) + stbIF7( output7[0] = ( r0 * c7s ); output7[1] = ( r1 * c7s ); output7[2] = ( r2 * c7s ); output7[3] = ( r3 * c7s ); ) + #endif + + input += 4; + stbIF0( output0 += 4; ) stbIF1( output1 += 4; ) stbIF2( output2 += 4; ) stbIF3( output3 += 4; ) stbIF4( output4 += 4; ) stbIF5( output5 += 4; ) stbIF6( output6 += 4; ) stbIF7( output7 += 4; ) + } + #endif + STBIR_NO_UNROLL_LOOP_START + while ( input < input_end ) + { + float r = input[0]; + STBIR_NO_UNROLL(output0); + + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( output0[0] += ( r * c0s ); ) + stbIF1( output1[0] += ( r * c1s ); ) + stbIF2( output2[0] += ( r * c2s ); ) + stbIF3( output3[0] += ( r * c3s ); ) + stbIF4( output4[0] += ( r * c4s ); ) + stbIF5( output5[0] += ( r * c5s ); ) + stbIF6( output6[0] += ( r * c6s ); ) + stbIF7( output7[0] += ( r * c7s ); ) + #else + stbIF0( output0[0] = ( r * c0s ); ) + stbIF1( output1[0] = ( r * c1s ); ) + stbIF2( output2[0] = ( r * c2s ); ) + stbIF3( output3[0] = ( r * c3s ); ) + stbIF4( output4[0] = ( r * c4s ); ) + stbIF5( output5[0] = ( r * c5s ); ) + stbIF6( output6[0] = ( r * c6s ); ) + stbIF7( output7[0] = ( r * c7s ); ) + #endif + + ++input; + stbIF0( ++output0; ) stbIF1( ++output1; ) stbIF2( ++output2; ) stbIF3( ++output3; ) stbIF4( ++output4; ) stbIF5( ++output5; ) stbIF6( ++output6; ) stbIF7( ++output7; ) + } +} + +static void STBIR_chans( stbir__vertical_gather_with_,_coeffs)( float * outputp, float const * vertical_coefficients, float const ** inputs, float const * input0_end ) +{ + float STBIR_SIMD_STREAMOUT_PTR( * ) output = outputp; + + stbIF0( float const * input0 = inputs[0]; float c0s = vertical_coefficients[0]; ) + stbIF1( float const * input1 = inputs[1]; float c1s = vertical_coefficients[1]; ) + stbIF2( float const * input2 = inputs[2]; float c2s = vertical_coefficients[2]; ) + stbIF3( float const * input3 = inputs[3]; float c3s = vertical_coefficients[3]; ) + stbIF4( float const * input4 = inputs[4]; float c4s = vertical_coefficients[4]; ) + stbIF5( float const * input5 = inputs[5]; float c5s = vertical_coefficients[5]; ) + stbIF6( float const * input6 = inputs[6]; float c6s = vertical_coefficients[6]; ) + stbIF7( float const * input7 = inputs[7]; float c7s = vertical_coefficients[7]; ) + +#if ( STBIR__vertical_channels == 1 ) && !defined(STB_IMAGE_RESIZE_VERTICAL_CONTINUE) + // check single channel one weight + if ( ( c0s >= (1.0f-0.000001f) ) && ( c0s <= (1.0f+0.000001f) ) ) + { + STBIR_MEMCPY( output, input0, (char*)input0_end - (char*)input0 ); + return; + } +#endif + + #ifdef STBIR_SIMD + { + stbIF0(stbir__simdfX c0 = stbir__simdf_frepX( c0s ); ) + stbIF1(stbir__simdfX c1 = stbir__simdf_frepX( c1s ); ) + stbIF2(stbir__simdfX c2 = stbir__simdf_frepX( c2s ); ) + stbIF3(stbir__simdfX c3 = stbir__simdf_frepX( c3s ); ) + stbIF4(stbir__simdfX c4 = stbir__simdf_frepX( c4s ); ) + stbIF5(stbir__simdfX c5 = stbir__simdf_frepX( c5s ); ) + stbIF6(stbir__simdfX c6 = stbir__simdf_frepX( c6s ); ) + stbIF7(stbir__simdfX c7 = stbir__simdf_frepX( c7s ); ) + + STBIR_SIMD_NO_UNROLL_LOOP_START + while ( ( (char*)input0_end - (char*) input0 ) >= (16*stbir__simdfX_float_count) ) + { + stbir__simdfX o0, o1, o2, o3, r0, r1, r2, r3; + STBIR_SIMD_NO_UNROLL(output); + + // prefetch four loop iterations ahead (doesn't affect much for small resizes, but helps with big ones) + stbIF0( stbir__prefetch( input0 + (16*stbir__simdfX_float_count) ); ) + stbIF1( stbir__prefetch( input1 + (16*stbir__simdfX_float_count) ); ) + stbIF2( stbir__prefetch( input2 + (16*stbir__simdfX_float_count) ); ) + stbIF3( stbir__prefetch( input3 + (16*stbir__simdfX_float_count) ); ) + stbIF4( stbir__prefetch( input4 + (16*stbir__simdfX_float_count) ); ) + stbIF5( stbir__prefetch( input5 + (16*stbir__simdfX_float_count) ); ) + stbIF6( stbir__prefetch( input6 + (16*stbir__simdfX_float_count) ); ) + stbIF7( stbir__prefetch( input7 + (16*stbir__simdfX_float_count) ); ) + + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( stbir__simdfX_load( o0, output ); stbir__simdfX_load( o1, output+stbir__simdfX_float_count ); stbir__simdfX_load( o2, output+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( o3, output+(3*stbir__simdfX_float_count) ); + stbir__simdfX_load( r0, input0 ); stbir__simdfX_load( r1, input0+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input0+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input0+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c0 ); stbir__simdfX_madd( o1, o1, r1, c0 ); stbir__simdfX_madd( o2, o2, r2, c0 ); stbir__simdfX_madd( o3, o3, r3, c0 ); ) + #else + stbIF0( stbir__simdfX_load( r0, input0 ); stbir__simdfX_load( r1, input0+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input0+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input0+(3*stbir__simdfX_float_count) ); + stbir__simdfX_mult( o0, r0, c0 ); stbir__simdfX_mult( o1, r1, c0 ); stbir__simdfX_mult( o2, r2, c0 ); stbir__simdfX_mult( o3, r3, c0 ); ) + #endif + + stbIF1( stbir__simdfX_load( r0, input1 ); stbir__simdfX_load( r1, input1+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input1+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input1+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c1 ); stbir__simdfX_madd( o1, o1, r1, c1 ); stbir__simdfX_madd( o2, o2, r2, c1 ); stbir__simdfX_madd( o3, o3, r3, c1 ); ) + stbIF2( stbir__simdfX_load( r0, input2 ); stbir__simdfX_load( r1, input2+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input2+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input2+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c2 ); stbir__simdfX_madd( o1, o1, r1, c2 ); stbir__simdfX_madd( o2, o2, r2, c2 ); stbir__simdfX_madd( o3, o3, r3, c2 ); ) + stbIF3( stbir__simdfX_load( r0, input3 ); stbir__simdfX_load( r1, input3+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input3+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input3+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c3 ); stbir__simdfX_madd( o1, o1, r1, c3 ); stbir__simdfX_madd( o2, o2, r2, c3 ); stbir__simdfX_madd( o3, o3, r3, c3 ); ) + stbIF4( stbir__simdfX_load( r0, input4 ); stbir__simdfX_load( r1, input4+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input4+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input4+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c4 ); stbir__simdfX_madd( o1, o1, r1, c4 ); stbir__simdfX_madd( o2, o2, r2, c4 ); stbir__simdfX_madd( o3, o3, r3, c4 ); ) + stbIF5( stbir__simdfX_load( r0, input5 ); stbir__simdfX_load( r1, input5+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input5+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input5+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c5 ); stbir__simdfX_madd( o1, o1, r1, c5 ); stbir__simdfX_madd( o2, o2, r2, c5 ); stbir__simdfX_madd( o3, o3, r3, c5 ); ) + stbIF6( stbir__simdfX_load( r0, input6 ); stbir__simdfX_load( r1, input6+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input6+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input6+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c6 ); stbir__simdfX_madd( o1, o1, r1, c6 ); stbir__simdfX_madd( o2, o2, r2, c6 ); stbir__simdfX_madd( o3, o3, r3, c6 ); ) + stbIF7( stbir__simdfX_load( r0, input7 ); stbir__simdfX_load( r1, input7+stbir__simdfX_float_count ); stbir__simdfX_load( r2, input7+(2*stbir__simdfX_float_count) ); stbir__simdfX_load( r3, input7+(3*stbir__simdfX_float_count) ); + stbir__simdfX_madd( o0, o0, r0, c7 ); stbir__simdfX_madd( o1, o1, r1, c7 ); stbir__simdfX_madd( o2, o2, r2, c7 ); stbir__simdfX_madd( o3, o3, r3, c7 ); ) + + stbir__simdfX_store( output, o0 ); stbir__simdfX_store( output+stbir__simdfX_float_count, o1 ); stbir__simdfX_store( output+(2*stbir__simdfX_float_count), o2 ); stbir__simdfX_store( output+(3*stbir__simdfX_float_count), o3 ); + output += (4*stbir__simdfX_float_count); + stbIF0( input0 += (4*stbir__simdfX_float_count); ) stbIF1( input1 += (4*stbir__simdfX_float_count); ) stbIF2( input2 += (4*stbir__simdfX_float_count); ) stbIF3( input3 += (4*stbir__simdfX_float_count); ) stbIF4( input4 += (4*stbir__simdfX_float_count); ) stbIF5( input5 += (4*stbir__simdfX_float_count); ) stbIF6( input6 += (4*stbir__simdfX_float_count); ) stbIF7( input7 += (4*stbir__simdfX_float_count); ) + } + + STBIR_SIMD_NO_UNROLL_LOOP_START + while ( ( (char*)input0_end - (char*) input0 ) >= 16 ) + { + stbir__simdf o0, r0; + STBIR_SIMD_NO_UNROLL(output); + + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( stbir__simdf_load( o0, output ); stbir__simdf_load( r0, input0 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c0 ) ); ) + #else + stbIF0( stbir__simdf_load( r0, input0 ); stbir__simdf_mult( o0, r0, stbir__if_simdf8_cast_to_simdf4( c0 ) ); ) + #endif + stbIF1( stbir__simdf_load( r0, input1 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c1 ) ); ) + stbIF2( stbir__simdf_load( r0, input2 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c2 ) ); ) + stbIF3( stbir__simdf_load( r0, input3 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c3 ) ); ) + stbIF4( stbir__simdf_load( r0, input4 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c4 ) ); ) + stbIF5( stbir__simdf_load( r0, input5 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c5 ) ); ) + stbIF6( stbir__simdf_load( r0, input6 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c6 ) ); ) + stbIF7( stbir__simdf_load( r0, input7 ); stbir__simdf_madd( o0, o0, r0, stbir__if_simdf8_cast_to_simdf4( c7 ) ); ) + + stbir__simdf_store( output, o0 ); + output += 4; + stbIF0( input0 += 4; ) stbIF1( input1 += 4; ) stbIF2( input2 += 4; ) stbIF3( input3 += 4; ) stbIF4( input4 += 4; ) stbIF5( input5 += 4; ) stbIF6( input6 += 4; ) stbIF7( input7 += 4; ) + } + } + #else + STBIR_NO_UNROLL_LOOP_START + while ( ( (char*)input0_end - (char*) input0 ) >= 16 ) + { + float o0, o1, o2, o3; + STBIR_NO_UNROLL(output); + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( o0 = output[0] + input0[0] * c0s; o1 = output[1] + input0[1] * c0s; o2 = output[2] + input0[2] * c0s; o3 = output[3] + input0[3] * c0s; ) + #else + stbIF0( o0 = input0[0] * c0s; o1 = input0[1] * c0s; o2 = input0[2] * c0s; o3 = input0[3] * c0s; ) + #endif + stbIF1( o0 += input1[0] * c1s; o1 += input1[1] * c1s; o2 += input1[2] * c1s; o3 += input1[3] * c1s; ) + stbIF2( o0 += input2[0] * c2s; o1 += input2[1] * c2s; o2 += input2[2] * c2s; o3 += input2[3] * c2s; ) + stbIF3( o0 += input3[0] * c3s; o1 += input3[1] * c3s; o2 += input3[2] * c3s; o3 += input3[3] * c3s; ) + stbIF4( o0 += input4[0] * c4s; o1 += input4[1] * c4s; o2 += input4[2] * c4s; o3 += input4[3] * c4s; ) + stbIF5( o0 += input5[0] * c5s; o1 += input5[1] * c5s; o2 += input5[2] * c5s; o3 += input5[3] * c5s; ) + stbIF6( o0 += input6[0] * c6s; o1 += input6[1] * c6s; o2 += input6[2] * c6s; o3 += input6[3] * c6s; ) + stbIF7( o0 += input7[0] * c7s; o1 += input7[1] * c7s; o2 += input7[2] * c7s; o3 += input7[3] * c7s; ) + output[0] = o0; output[1] = o1; output[2] = o2; output[3] = o3; + output += 4; + stbIF0( input0 += 4; ) stbIF1( input1 += 4; ) stbIF2( input2 += 4; ) stbIF3( input3 += 4; ) stbIF4( input4 += 4; ) stbIF5( input5 += 4; ) stbIF6( input6 += 4; ) stbIF7( input7 += 4; ) + } + #endif + STBIR_NO_UNROLL_LOOP_START + while ( input0 < input0_end ) + { + float o0; + STBIR_NO_UNROLL(output); + #ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE + stbIF0( o0 = output[0] + input0[0] * c0s; ) + #else + stbIF0( o0 = input0[0] * c0s; ) + #endif + stbIF1( o0 += input1[0] * c1s; ) + stbIF2( o0 += input2[0] * c2s; ) + stbIF3( o0 += input3[0] * c3s; ) + stbIF4( o0 += input4[0] * c4s; ) + stbIF5( o0 += input5[0] * c5s; ) + stbIF6( o0 += input6[0] * c6s; ) + stbIF7( o0 += input7[0] * c7s; ) + output[0] = o0; + ++output; + stbIF0( ++input0; ) stbIF1( ++input1; ) stbIF2( ++input2; ) stbIF3( ++input3; ) stbIF4( ++input4; ) stbIF5( ++input5; ) stbIF6( ++input6; ) stbIF7( ++input7; ) + } +} + +#undef stbIF0 +#undef stbIF1 +#undef stbIF2 +#undef stbIF3 +#undef stbIF4 +#undef stbIF5 +#undef stbIF6 +#undef stbIF7 +#undef STB_IMAGE_RESIZE_DO_VERTICALS +#undef STBIR__vertical_channels +#undef STB_IMAGE_RESIZE_DO_HORIZONTALS +#undef STBIR_strs_join24 +#undef STBIR_strs_join14 +#undef STBIR_chans +#ifdef STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#undef STB_IMAGE_RESIZE_VERTICAL_CONTINUE +#endif + +#else // !STB_IMAGE_RESIZE_DO_VERTICALS + +#define STBIR_chans( start, end ) STBIR_strs_join1(start,STBIR__horizontal_channels,end) + +#ifndef stbir__2_coeff_only +#define stbir__2_coeff_only() \ + stbir__1_coeff_only(); \ + stbir__1_coeff_remnant(1); +#endif + +#ifndef stbir__2_coeff_remnant +#define stbir__2_coeff_remnant( ofs ) \ + stbir__1_coeff_remnant(ofs); \ + stbir__1_coeff_remnant((ofs)+1); +#endif + +#ifndef stbir__3_coeff_only +#define stbir__3_coeff_only() \ + stbir__2_coeff_only(); \ + stbir__1_coeff_remnant(2); +#endif + +#ifndef stbir__3_coeff_remnant +#define stbir__3_coeff_remnant( ofs ) \ + stbir__2_coeff_remnant(ofs); \ + stbir__1_coeff_remnant((ofs)+2); +#endif + +#ifndef stbir__3_coeff_setup +#define stbir__3_coeff_setup() +#endif + +#ifndef stbir__4_coeff_start +#define stbir__4_coeff_start() \ + stbir__2_coeff_only(); \ + stbir__2_coeff_remnant(2); +#endif + +#ifndef stbir__4_coeff_continue_from_4 +#define stbir__4_coeff_continue_from_4( ofs ) \ + stbir__2_coeff_remnant(ofs); \ + stbir__2_coeff_remnant((ofs)+2); +#endif + +#ifndef stbir__store_output_tiny +#define stbir__store_output_tiny stbir__store_output +#endif + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_1_coeff)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__1_coeff_only(); + stbir__store_output_tiny(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_2_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__2_coeff_only(); + stbir__store_output_tiny(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_3_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__3_coeff_only(); + stbir__store_output_tiny(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_4_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_5_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__1_coeff_remnant(4); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_6_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__2_coeff_remnant(4); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_7_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + stbir__3_coeff_setup(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + + stbir__4_coeff_start(); + stbir__3_coeff_remnant(4); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_8_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__4_coeff_continue_from_4(4); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_9_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__4_coeff_continue_from_4(4); + stbir__1_coeff_remnant(8); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_10_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__4_coeff_continue_from_4(4); + stbir__2_coeff_remnant(8); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_11_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + stbir__3_coeff_setup(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__4_coeff_continue_from_4(4); + stbir__3_coeff_remnant(8); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_12_coeffs)( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + float const * hc = horizontal_coefficients; + stbir__4_coeff_start(); + stbir__4_coeff_continue_from_4(4); + stbir__4_coeff_continue_from_4(8); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_n_coeffs_mod0 )( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + int n = ( ( horizontal_contributors->n1 - horizontal_contributors->n0 + 1 ) - 4 + 3 ) >> 2; + float const * hc = horizontal_coefficients; + + stbir__4_coeff_start(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + hc += 4; + decode += STBIR__horizontal_channels * 4; + stbir__4_coeff_continue_from_4( 0 ); + --n; + } while ( n > 0 ); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_n_coeffs_mod1 )( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + int n = ( ( horizontal_contributors->n1 - horizontal_contributors->n0 + 1 ) - 5 + 3 ) >> 2; + float const * hc = horizontal_coefficients; + + stbir__4_coeff_start(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + hc += 4; + decode += STBIR__horizontal_channels * 4; + stbir__4_coeff_continue_from_4( 0 ); + --n; + } while ( n > 0 ); + stbir__1_coeff_remnant( 4 ); + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_n_coeffs_mod2 )( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + int n = ( ( horizontal_contributors->n1 - horizontal_contributors->n0 + 1 ) - 6 + 3 ) >> 2; + float const * hc = horizontal_coefficients; + + stbir__4_coeff_start(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + hc += 4; + decode += STBIR__horizontal_channels * 4; + stbir__4_coeff_continue_from_4( 0 ); + --n; + } while ( n > 0 ); + stbir__2_coeff_remnant( 4 ); + + stbir__store_output(); + } while ( output < output_end ); +} + +static void STBIR_chans( stbir__horizontal_gather_,_channels_with_n_coeffs_mod3 )( float * output_buffer, unsigned int output_sub_size, float const * decode_buffer, stbir__contributors const * horizontal_contributors, float const * horizontal_coefficients, int coefficient_width ) +{ + float const * output_end = output_buffer + output_sub_size * STBIR__horizontal_channels; + float STBIR_SIMD_STREAMOUT_PTR( * ) output = output_buffer; + stbir__3_coeff_setup(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + float const * decode = decode_buffer + horizontal_contributors->n0 * STBIR__horizontal_channels; + int n = ( ( horizontal_contributors->n1 - horizontal_contributors->n0 + 1 ) - 7 + 3 ) >> 2; + float const * hc = horizontal_coefficients; + + stbir__4_coeff_start(); + STBIR_SIMD_NO_UNROLL_LOOP_START + do { + hc += 4; + decode += STBIR__horizontal_channels * 4; + stbir__4_coeff_continue_from_4( 0 ); + --n; + } while ( n > 0 ); + stbir__3_coeff_remnant( 4 ); + + stbir__store_output(); + } while ( output < output_end ); +} + +static stbir__horizontal_gather_channels_func * STBIR_chans(stbir__horizontal_gather_,_channels_with_n_coeffs_funcs)[4]= +{ + STBIR_chans(stbir__horizontal_gather_,_channels_with_n_coeffs_mod0), + STBIR_chans(stbir__horizontal_gather_,_channels_with_n_coeffs_mod1), + STBIR_chans(stbir__horizontal_gather_,_channels_with_n_coeffs_mod2), + STBIR_chans(stbir__horizontal_gather_,_channels_with_n_coeffs_mod3), +}; + +static stbir__horizontal_gather_channels_func * STBIR_chans(stbir__horizontal_gather_,_channels_funcs)[12]= +{ + STBIR_chans(stbir__horizontal_gather_,_channels_with_1_coeff), + STBIR_chans(stbir__horizontal_gather_,_channels_with_2_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_3_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_4_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_5_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_6_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_7_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_8_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_9_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_10_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_11_coeffs), + STBIR_chans(stbir__horizontal_gather_,_channels_with_12_coeffs), +}; + +#undef STBIR__horizontal_channels +#undef STB_IMAGE_RESIZE_DO_HORIZONTALS +#undef stbir__1_coeff_only +#undef stbir__1_coeff_remnant +#undef stbir__2_coeff_only +#undef stbir__2_coeff_remnant +#undef stbir__3_coeff_only +#undef stbir__3_coeff_remnant +#undef stbir__3_coeff_setup +#undef stbir__4_coeff_start +#undef stbir__4_coeff_continue_from_4 +#undef stbir__store_output +#undef stbir__store_output_tiny +#undef STBIR_chans + +#endif // HORIZONALS + +#undef STBIR_strs_join2 +#undef STBIR_strs_join1 + +#endif // STB_IMAGE_RESIZE_DO_HORIZONTALS/VERTICALS/CODERS + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ diff --git a/lib/stb_image_write.h b/lib/stb_image_write.h new file mode 100644 index 0000000..e4b32ed --- /dev/null +++ b/lib/stb_image_write.h @@ -0,0 +1,1724 @@ +/* stb_image_write - v1.16 - public domain - http://nothings.org/stb + writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015 + no warranty implied; use at your own risk + + Before #including, + + #define STB_IMAGE_WRITE_IMPLEMENTATION + + in the file that you want to have the implementation. + + Will probably not work correctly with strict-aliasing optimizations. + +ABOUT: + + This header file is a library for writing images to C stdio or a callback. + + The PNG output is not optimal; it is 20-50% larger than the file + written by a decent optimizing implementation; though providing a custom + zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that. + This library is designed for source code compactness and simplicity, + not optimal image file size or run-time performance. + +BUILDING: + + You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h. + You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace + malloc,realloc,free. + You can #define STBIW_MEMMOVE() to replace memmove() + You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function + for PNG compression (instead of the builtin one), it must have the following signature: + unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality); + The returned data will be freed with STBIW_FREE() (free() by default), + so it must be heap allocated with STBIW_MALLOC() (malloc() by default), + +UNICODE: + + If compiling for Windows and you wish to use Unicode filenames, compile + with + #define STBIW_WINDOWS_UTF8 + and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert + Windows wchar_t filenames to utf8. + +USAGE: + + There are five functions, one for each image file format: + + int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); + int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); + int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); + int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality); + int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); + + void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically + + There are also five equivalent functions that use an arbitrary write function. You are + expected to open/close your file-equivalent before and after calling these: + + int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); + int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); + int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); + int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); + int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); + + where the callback is: + void stbi_write_func(void *context, void *data, int size); + + You can configure it with these global variables: + int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE + int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression + int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode + + + You can define STBI_WRITE_NO_STDIO to disable the file variant of these + functions, so the library will not use stdio.h at all. However, this will + also disable HDR writing, because it requires stdio for formatted output. + + Each function returns 0 on failure and non-0 on success. + + The functions create an image file defined by the parameters. The image + is a rectangle of pixels stored from left-to-right, top-to-bottom. + Each pixel contains 'comp' channels of data stored interleaved with 8-bits + per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is + monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall. + The *data pointer points to the first byte of the top-left-most pixel. + For PNG, "stride_in_bytes" is the distance in bytes from the first byte of + a row of pixels to the first byte of the next row of pixels. + + PNG creates output files with the same number of components as the input. + The BMP format expands Y to RGB in the file format and does not + output alpha. + + PNG supports writing rectangles of data even when the bytes storing rows of + data are not consecutive in memory (e.g. sub-rectangles of a larger image), + by supplying the stride between the beginning of adjacent rows. The other + formats do not. (Thus you cannot write a native-format BMP through the BMP + writer, both because it is in BGR order and because it may have padding + at the end of the line.) + + PNG allows you to set the deflate compression level by setting the global + variable 'stbi_write_png_compression_level' (it defaults to 8). + + HDR expects linear float data. Since the format is always 32-bit rgb(e) + data, alpha (if provided) is discarded, and for monochrome data it is + replicated across all three channels. + + TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed + data, set the global variable 'stbi_write_tga_with_rle' to 0. + + JPEG does ignore alpha channels in input data; quality is between 1 and 100. + Higher quality looks better but results in a bigger image. + JPEG baseline (no JPEG progressive). + +CREDITS: + + + Sean Barrett - PNG/BMP/TGA + Baldur Karlsson - HDR + Jean-Sebastien Guay - TGA monochrome + Tim Kelsey - misc enhancements + Alan Hickman - TGA RLE + Emmanuel Julien - initial file IO callback implementation + Jon Olick - original jo_jpeg.cpp code + Daniel Gibson - integrate JPEG, allow external zlib + Aarni Koskela - allow choosing PNG filter + + bugfixes: + github:Chribba + Guillaume Chereau + github:jry2 + github:romigrou + Sergio Gonzalez + Jonas Karlsson + Filip Wasil + Thatcher Ulrich + github:poppolopoppo + Patrick Boettcher + github:xeekworx + Cap Petschulat + Simon Rodriguez + Ivan Tikhonov + github:ignotion + Adam Schackart + Andrew Kensler + +LICENSE + + See end of file for license information. + +*/ + +#ifndef INCLUDE_STB_IMAGE_WRITE_H +#define INCLUDE_STB_IMAGE_WRITE_H + +#include <stdlib.h> + +// if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline' +#ifndef STBIWDEF +#ifdef STB_IMAGE_WRITE_STATIC +#define STBIWDEF static +#else +#ifdef __cplusplus +#define STBIWDEF extern "C" +#else +#define STBIWDEF extern +#endif +#endif +#endif + +#ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations +STBIWDEF int stbi_write_tga_with_rle; +STBIWDEF int stbi_write_png_compression_level; +STBIWDEF int stbi_write_force_png_filter; +#endif + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); +STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); +STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality); + +#ifdef STBIW_WINDOWS_UTF8 +STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input); +#endif +#endif + +typedef void stbi_write_func(void *context, void *data, int size); + +STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); +STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); +STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); +STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); + +STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean); + +#endif//INCLUDE_STB_IMAGE_WRITE_H + +#ifdef STB_IMAGE_WRITE_IMPLEMENTATION + +#ifdef _WIN32 + #ifndef _CRT_SECURE_NO_WARNINGS + #define _CRT_SECURE_NO_WARNINGS + #endif + #ifndef _CRT_NONSTDC_NO_DEPRECATE + #define _CRT_NONSTDC_NO_DEPRECATE + #endif +#endif + +#ifndef STBI_WRITE_NO_STDIO +#include <stdio.h> +#endif // STBI_WRITE_NO_STDIO + +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <math.h> + +#if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) +// ok +#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) +// ok +#else +#error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." +#endif + +#ifndef STBIW_MALLOC +#define STBIW_MALLOC(sz) malloc(sz) +#define STBIW_REALLOC(p,newsz) realloc(p,newsz) +#define STBIW_FREE(p) free(p) +#endif + +#ifndef STBIW_REALLOC_SIZED +#define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) +#endif + + +#ifndef STBIW_MEMMOVE +#define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) +#endif + + +#ifndef STBIW_ASSERT +#include <assert.h> +#define STBIW_ASSERT(x) assert(x) +#endif + +#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) + +#ifdef STB_IMAGE_WRITE_STATIC +static int stbi_write_png_compression_level = 8; +static int stbi_write_tga_with_rle = 1; +static int stbi_write_force_png_filter = -1; +#else +int stbi_write_png_compression_level = 8; +int stbi_write_tga_with_rle = 1; +int stbi_write_force_png_filter = -1; +#endif + +static int stbi__flip_vertically_on_write = 0; + +STBIWDEF void stbi_flip_vertically_on_write(int flag) +{ + stbi__flip_vertically_on_write = flag; +} + +typedef struct +{ + stbi_write_func *func; + void *context; + unsigned char buffer[64]; + int buf_used; +} stbi__write_context; + +// initialize a callback-based context +static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) +{ + s->func = c; + s->context = context; +} + +#ifndef STBI_WRITE_NO_STDIO + +static void stbi__stdio_write(void *context, void *data, int size) +{ + fwrite(data,1,size,(FILE*) context); +} + +#if defined(_WIN32) && defined(STBIW_WINDOWS_UTF8) +#ifdef __cplusplus +#define STBIW_EXTERN extern "C" +#else +#define STBIW_EXTERN extern +#endif +STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); +STBIW_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default); + +STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) +{ + return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); +} +#endif + +static FILE *stbiw__fopen(char const *filename, char const *mode) +{ + FILE *f; +#if defined(_WIN32) && defined(STBIW_WINDOWS_UTF8) + wchar_t wMode[64]; + wchar_t wFilename[1024]; + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)/sizeof(*wFilename))) + return 0; + + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)/sizeof(*wMode))) + return 0; + +#if defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != _wfopen_s(&f, wFilename, wMode)) + f = 0; +#else + f = _wfopen(wFilename, wMode); +#endif + +#elif defined(_MSC_VER) && _MSC_VER >= 1400 + if (0 != fopen_s(&f, filename, mode)) + f=0; +#else + f = fopen(filename, mode); +#endif + return f; +} + +static int stbi__start_write_file(stbi__write_context *s, const char *filename) +{ + FILE *f = stbiw__fopen(filename, "wb"); + stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); + return f != NULL; +} + +static void stbi__end_write_file(stbi__write_context *s) +{ + fclose((FILE *)s->context); +} + +#endif // !STBI_WRITE_NO_STDIO + +typedef unsigned int stbiw_uint32; +typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; + +static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) +{ + while (*fmt) { + switch (*fmt++) { + case ' ': break; + case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); + s->func(s->context,&x,1); + break; } + case '2': { int x = va_arg(v,int); + unsigned char b[2]; + b[0] = STBIW_UCHAR(x); + b[1] = STBIW_UCHAR(x>>8); + s->func(s->context,b,2); + break; } + case '4': { stbiw_uint32 x = va_arg(v,int); + unsigned char b[4]; + b[0]=STBIW_UCHAR(x); + b[1]=STBIW_UCHAR(x>>8); + b[2]=STBIW_UCHAR(x>>16); + b[3]=STBIW_UCHAR(x>>24); + s->func(s->context,b,4); + break; } + default: + STBIW_ASSERT(0); + return; + } + } +} + +static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) +{ + va_list v; + va_start(v, fmt); + stbiw__writefv(s, fmt, v); + va_end(v); +} + +static void stbiw__write_flush(stbi__write_context *s) +{ + if (s->buf_used) { + s->func(s->context, &s->buffer, s->buf_used); + s->buf_used = 0; + } +} + +static void stbiw__putc(stbi__write_context *s, unsigned char c) +{ + s->func(s->context, &c, 1); +} + +static void stbiw__write1(stbi__write_context *s, unsigned char a) +{ + if ((size_t)s->buf_used + 1 > sizeof(s->buffer)) + stbiw__write_flush(s); + s->buffer[s->buf_used++] = a; +} + +static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) +{ + int n; + if ((size_t)s->buf_used + 3 > sizeof(s->buffer)) + stbiw__write_flush(s); + n = s->buf_used; + s->buf_used = n+3; + s->buffer[n+0] = a; + s->buffer[n+1] = b; + s->buffer[n+2] = c; +} + +static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) +{ + unsigned char bg[3] = { 255, 0, 255}, px[3]; + int k; + + if (write_alpha < 0) + stbiw__write1(s, d[comp - 1]); + + switch (comp) { + case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case + case 1: + if (expand_mono) + stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp + else + stbiw__write1(s, d[0]); // monochrome TGA + break; + case 4: + if (!write_alpha) { + // composite against pink background + for (k = 0; k < 3; ++k) + px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; + stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); + break; + } + /* FALLTHROUGH */ + case 3: + stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); + break; + } + if (write_alpha > 0) + stbiw__write1(s, d[comp - 1]); +} + +static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono) +{ + stbiw_uint32 zero = 0; + int i,j, j_end; + + if (y <= 0) + return; + + if (stbi__flip_vertically_on_write) + vdir *= -1; + + if (vdir < 0) { + j_end = -1; j = y-1; + } else { + j_end = y; j = 0; + } + + for (; j != j_end; j += vdir) { + for (i=0; i < x; ++i) { + unsigned char *d = (unsigned char *) data + (j*x+i)*comp; + stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); + } + stbiw__write_flush(s); + s->func(s->context, &zero, scanline_pad); + } +} + +static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...) +{ + if (y < 0 || x < 0) { + return 0; + } else { + va_list v; + va_start(v, fmt); + stbiw__writefv(s, fmt, v); + va_end(v); + stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); + return 1; + } +} + +static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) +{ + if (comp != 4) { + // write RGB bitmap + int pad = (-x*3) & 3; + return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, + "11 4 22 4" "4 44 22 444444", + 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header + 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header + } else { + // RGBA bitmaps need a v4 header + // use BI_BITFIELDS mode with 32bpp and alpha mask + // (straight BI_RGB with alpha mask doesn't work in most readers) + return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *)data,1,0, + "11 4 22 4" "4 44 22 444444 4444 4 444 444 444 444", + 'B', 'M', 14+108+x*y*4, 0, 0, 14+108, // file header + 108, x,y, 1,32, 3,0,0,0,0,0, 0xff0000,0xff00,0xff,0xff000000u, 0, 0,0,0, 0,0,0, 0,0,0, 0,0,0); // bitmap V4 header + } +} + +STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) +{ + stbi__write_context s = { 0 }; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_bmp_core(&s, x, y, comp, data); +} + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) +{ + stbi__write_context s = { 0 }; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_bmp_core(&s, x, y, comp, data); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif //!STBI_WRITE_NO_STDIO + +static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) +{ + int has_alpha = (comp == 2 || comp == 4); + int colorbytes = has_alpha ? comp-1 : comp; + int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 + + if (y < 0 || x < 0) + return 0; + + if (!stbi_write_tga_with_rle) { + return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, + "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8); + } else { + int i,j,k; + int jend, jdir; + + stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8); + + if (stbi__flip_vertically_on_write) { + j = 0; + jend = y; + jdir = 1; + } else { + j = y-1; + jend = -1; + jdir = -1; + } + for (; j != jend; j += jdir) { + unsigned char *row = (unsigned char *) data + j * x * comp; + int len; + + for (i = 0; i < x; i += len) { + unsigned char *begin = row + i * comp; + int diff = 1; + len = 1; + + if (i < x - 1) { + ++len; + diff = memcmp(begin, row + (i + 1) * comp, comp); + if (diff) { + const unsigned char *prev = begin; + for (k = i + 2; k < x && len < 128; ++k) { + if (memcmp(prev, row + k * comp, comp)) { + prev += comp; + ++len; + } else { + --len; + break; + } + } + } else { + for (k = i + 2; k < x && len < 128; ++k) { + if (!memcmp(begin, row + k * comp, comp)) { + ++len; + } else { + break; + } + } + } + } + + if (diff) { + unsigned char header = STBIW_UCHAR(len - 1); + stbiw__write1(s, header); + for (k = 0; k < len; ++k) { + stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); + } + } else { + unsigned char header = STBIW_UCHAR(len - 129); + stbiw__write1(s, header); + stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); + } + } + } + stbiw__write_flush(s); + } + return 1; +} + +STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) +{ + stbi__write_context s = { 0 }; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_tga_core(&s, x, y, comp, (void *) data); +} + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) +{ + stbi__write_context s = { 0 }; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR writer +// by Baldur Karlsson + +#define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) + +#ifndef STBI_WRITE_NO_STDIO + +static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) +{ + int exponent; + float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); + + if (maxcomp < 1e-32f) { + rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; + } else { + float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; + + rgbe[0] = (unsigned char)(linear[0] * normalize); + rgbe[1] = (unsigned char)(linear[1] * normalize); + rgbe[2] = (unsigned char)(linear[2] * normalize); + rgbe[3] = (unsigned char)(exponent + 128); + } +} + +static void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) +{ + unsigned char lengthbyte = STBIW_UCHAR(length+128); + STBIW_ASSERT(length+128 <= 255); + s->func(s->context, &lengthbyte, 1); + s->func(s->context, &databyte, 1); +} + +static void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) +{ + unsigned char lengthbyte = STBIW_UCHAR(length); + STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code + s->func(s->context, &lengthbyte, 1); + s->func(s->context, data, length); +} + +static void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) +{ + unsigned char scanlineheader[4] = { 2, 2, 0, 0 }; + unsigned char rgbe[4]; + float linear[3]; + int x; + + scanlineheader[2] = (width&0xff00)>>8; + scanlineheader[3] = (width&0x00ff); + + /* skip RLE for images too small or large */ + if (width < 8 || width >= 32768) { + for (x=0; x < width; x++) { + switch (ncomp) { + case 4: /* fallthrough */ + case 3: linear[2] = scanline[x*ncomp + 2]; + linear[1] = scanline[x*ncomp + 1]; + linear[0] = scanline[x*ncomp + 0]; + break; + default: + linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; + break; + } + stbiw__linear_to_rgbe(rgbe, linear); + s->func(s->context, rgbe, 4); + } + } else { + int c,r; + /* encode into scratch buffer */ + for (x=0; x < width; x++) { + switch(ncomp) { + case 4: /* fallthrough */ + case 3: linear[2] = scanline[x*ncomp + 2]; + linear[1] = scanline[x*ncomp + 1]; + linear[0] = scanline[x*ncomp + 0]; + break; + default: + linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; + break; + } + stbiw__linear_to_rgbe(rgbe, linear); + scratch[x + width*0] = rgbe[0]; + scratch[x + width*1] = rgbe[1]; + scratch[x + width*2] = rgbe[2]; + scratch[x + width*3] = rgbe[3]; + } + + s->func(s->context, scanlineheader, 4); + + /* RLE each component separately */ + for (c=0; c < 4; c++) { + unsigned char *comp = &scratch[width*c]; + + x = 0; + while (x < width) { + // find first run + r = x; + while (r+2 < width) { + if (comp[r] == comp[r+1] && comp[r] == comp[r+2]) + break; + ++r; + } + if (r+2 >= width) + r = width; + // dump up to first run + while (x < r) { + int len = r-x; + if (len > 128) len = 128; + stbiw__write_dump_data(s, len, &comp[x]); + x += len; + } + // if there's a run, output it + if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd + // find next byte after run + while (r < width && comp[r] == comp[x]) + ++r; + // output run up to r + while (x < r) { + int len = r-x; + if (len > 127) len = 127; + stbiw__write_run_data(s, len, comp[x]); + x += len; + } + } + } + } + } +} + +static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) +{ + if (y <= 0 || x <= 0 || data == NULL) + return 0; + else { + // Each component is stored separately. Allocate scratch space for full output scanline. + unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4); + int i, len; + char buffer[128]; + char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n"; + s->func(s->context, header, sizeof(header)-1); + +#ifdef __STDC_LIB_EXT1__ + len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); +#else + len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); +#endif + s->func(s->context, buffer, len); + + for(i=0; i < y; i++) + stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i)); + STBIW_FREE(scratch); + return 1; + } +} + +STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) +{ + stbi__write_context s = { 0 }; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_hdr_core(&s, x, y, comp, (float *) data); +} + +STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) +{ + stbi__write_context s = { 0 }; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif // STBI_WRITE_NO_STDIO + + +////////////////////////////////////////////////////////////////////////////// +// +// PNG writer +// + +#ifndef STBIW_ZLIB_COMPRESS +// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() +#define stbiw__sbraw(a) ((int *) (void *) (a) - 2) +#define stbiw__sbm(a) stbiw__sbraw(a)[0] +#define stbiw__sbn(a) stbiw__sbraw(a)[1] + +#define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a)) +#define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0) +#define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a))) + +#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v)) +#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0) +#define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0) + +static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) +{ + int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; + void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); + STBIW_ASSERT(p); + if (p) { + if (!*arr) ((int *) p)[1] = 0; + *arr = (void *) ((int *) p + 2); + stbiw__sbm(*arr) = m; + } + return *arr; +} + +static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) +{ + while (*bitcount >= 8) { + stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); + *bitbuffer >>= 8; + *bitcount -= 8; + } + return data; +} + +static int stbiw__zlib_bitrev(int code, int codebits) +{ + int res=0; + while (codebits--) { + res = (res << 1) | (code & 1); + code >>= 1; + } + return res; +} + +static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit) +{ + int i; + for (i=0; i < limit && i < 258; ++i) + if (a[i] != b[i]) break; + return i; +} + +static unsigned int stbiw__zhash(unsigned char *data) +{ + stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16); + hash ^= hash << 3; + hash += hash >> 5; + hash ^= hash << 4; + hash += hash >> 17; + hash ^= hash << 25; + hash += hash >> 6; + return hash; +} + +#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount)) +#define stbiw__zlib_add(code,codebits) \ + (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush()) +#define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c) +// default huffman tables +#define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8) +#define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9) +#define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7) +#define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8) +#define stbiw__zlib_huff(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n)) +#define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n)) + +#define stbiw__ZHASH 16384 + +#endif // STBIW_ZLIB_COMPRESS + +STBIWDEF unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) +{ +#ifdef STBIW_ZLIB_COMPRESS + // user provided a zlib compress implementation, use that + return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality); +#else // use builtin + static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 }; + static unsigned char lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 }; + static unsigned short distc[] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 }; + static unsigned char disteb[] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 }; + unsigned int bitbuf=0; + int i,j, bitcount=0; + unsigned char *out = NULL; + unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char**)); + if (hash_table == NULL) + return NULL; + if (quality < 5) quality = 5; + + stbiw__sbpush(out, 0x78); // DEFLATE 32K window + stbiw__sbpush(out, 0x5e); // FLEVEL = 1 + stbiw__zlib_add(1,1); // BFINAL = 1 + stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman + + for (i=0; i < stbiw__ZHASH; ++i) + hash_table[i] = NULL; + + i=0; + while (i < data_len-3) { + // hash next 3 bytes of data to be compressed + int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3; + unsigned char *bestloc = 0; + unsigned char **hlist = hash_table[h]; + int n = stbiw__sbcount(hlist); + for (j=0; j < n; ++j) { + if (hlist[j]-data > i-32768) { // if entry lies within window + int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i); + if (d >= best) { best=d; bestloc=hlist[j]; } + } + } + // when hash table entry is too long, delete half the entries + if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) { + STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality); + stbiw__sbn(hash_table[h]) = quality; + } + stbiw__sbpush(hash_table[h],data+i); + + if (bestloc) { + // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal + h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1); + hlist = hash_table[h]; + n = stbiw__sbcount(hlist); + for (j=0; j < n; ++j) { + if (hlist[j]-data > i-32767) { + int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1); + if (e > best) { // if next match is better, bail on current match + bestloc = NULL; + break; + } + } + } + } + + if (bestloc) { + int d = (int) (data+i - bestloc); // distance back + STBIW_ASSERT(d <= 32767 && best <= 258); + for (j=0; best > lengthc[j+1]-1; ++j); + stbiw__zlib_huff(j+257); + if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]); + for (j=0; d > distc[j+1]-1; ++j); + stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5); + if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]); + i += best; + } else { + stbiw__zlib_huffb(data[i]); + ++i; + } + } + // write out final bytes + for (;i < data_len; ++i) + stbiw__zlib_huffb(data[i]); + stbiw__zlib_huff(256); // end of block + // pad with 0 bits to byte boundary + while (bitcount) + stbiw__zlib_add(0,1); + + for (i=0; i < stbiw__ZHASH; ++i) + (void) stbiw__sbfree(hash_table[i]); + STBIW_FREE(hash_table); + + // store uncompressed instead if compression was worse + if (stbiw__sbn(out) > data_len + 2 + ((data_len+32766)/32767)*5) { + stbiw__sbn(out) = 2; // truncate to DEFLATE 32K window and FLEVEL = 1 + for (j = 0; j < data_len;) { + int blocklen = data_len - j; + if (blocklen > 32767) blocklen = 32767; + stbiw__sbpush(out, data_len - j == blocklen); // BFINAL = ?, BTYPE = 0 -- no compression + stbiw__sbpush(out, STBIW_UCHAR(blocklen)); // LEN + stbiw__sbpush(out, STBIW_UCHAR(blocklen >> 8)); + stbiw__sbpush(out, STBIW_UCHAR(~blocklen)); // NLEN + stbiw__sbpush(out, STBIW_UCHAR(~blocklen >> 8)); + memcpy(out+stbiw__sbn(out), data+j, blocklen); + stbiw__sbn(out) += blocklen; + j += blocklen; + } + } + + { + // compute adler32 on input + unsigned int s1=1, s2=0; + int blocklen = (int) (data_len % 5552); + j=0; + while (j < data_len) { + for (i=0; i < blocklen; ++i) { s1 += data[j+i]; s2 += s1; } + s1 %= 65521; s2 %= 65521; + j += blocklen; + blocklen = 5552; + } + stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); + stbiw__sbpush(out, STBIW_UCHAR(s2)); + stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); + stbiw__sbpush(out, STBIW_UCHAR(s1)); + } + *out_len = stbiw__sbn(out); + // make returned pointer freeable + STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len); + return (unsigned char *) stbiw__sbraw(out); +#endif // STBIW_ZLIB_COMPRESS +} + +static unsigned int stbiw__crc32(unsigned char *buffer, int len) +{ +#ifdef STBIW_CRC32 + return STBIW_CRC32(buffer, len); +#else + static unsigned int crc_table[256] = + { + 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, + 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, + 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, + 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, + 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, + 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, + 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, + 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, + 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, + 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, + 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, + 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, + 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, + 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, + 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, + 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, + 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, + 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, + 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, + 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, + 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, + 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, + 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, + 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, + 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, + 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, + 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, + 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, + 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, + 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, + 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, + 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D + }; + + unsigned int crc = ~0u; + int i; + for (i=0; i < len; ++i) + crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; + return ~crc; +#endif +} + +#define stbiw__wpng4(o,a,b,c,d) ((o)[0]=STBIW_UCHAR(a),(o)[1]=STBIW_UCHAR(b),(o)[2]=STBIW_UCHAR(c),(o)[3]=STBIW_UCHAR(d),(o)+=4) +#define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v)); +#define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3]) + +static void stbiw__wpcrc(unsigned char **data, int len) +{ + unsigned int crc = stbiw__crc32(*data - len - 4, len+4); + stbiw__wp32(*data, crc); +} + +static unsigned char stbiw__paeth(int a, int b, int c) +{ + int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c); + if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); + if (pb <= pc) return STBIW_UCHAR(b); + return STBIW_UCHAR(c); +} + +// @OPTIMIZE: provide an option that always forces left-predict or paeth predict +static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int width, int height, int y, int n, int filter_type, signed char *line_buffer) +{ + static int mapping[] = { 0,1,2,3,4 }; + static int firstmap[] = { 0,1,0,5,6 }; + int *mymap = (y != 0) ? mapping : firstmap; + int i; + int type = mymap[filter_type]; + unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y); + int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes; + + if (type==0) { + memcpy(line_buffer, z, width*n); + return; + } + + // first loop isn't optimized since it's just one pixel + for (i = 0; i < n; ++i) { + switch (type) { + case 1: line_buffer[i] = z[i]; break; + case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break; + case 3: line_buffer[i] = z[i] - (z[i-signed_stride]>>1); break; + case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-signed_stride],0)); break; + case 5: line_buffer[i] = z[i]; break; + case 6: line_buffer[i] = z[i]; break; + } + } + switch (type) { + case 1: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-n]; break; + case 2: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-signed_stride]; break; + case 3: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - ((z[i-n] + z[i-signed_stride])>>1); break; + case 4: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-signed_stride], z[i-signed_stride-n]); break; + case 5: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - (z[i-n]>>1); break; + case 6: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; + } +} + +STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) +{ + int force_filter = stbi_write_force_png_filter; + int ctype[5] = { -1, 0, 4, 2, 6 }; + unsigned char sig[8] = { 137,80,78,71,13,10,26,10 }; + unsigned char *out,*o, *filt, *zlib; + signed char *line_buffer; + int j,zlen; + + if (stride_bytes == 0) + stride_bytes = x * n; + + if (force_filter >= 5) { + force_filter = -1; + } + + filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0; + line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; } + for (j=0; j < y; ++j) { + int filter_type; + if (force_filter > -1) { + filter_type = force_filter; + stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, force_filter, line_buffer); + } else { // Estimate the best filter by running through all of them: + int best_filter = 0, best_filter_val = 0x7fffffff, est, i; + for (filter_type = 0; filter_type < 5; filter_type++) { + stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, filter_type, line_buffer); + + // Estimate the entropy of the line using this filter; the less, the better. + est = 0; + for (i = 0; i < x*n; ++i) { + est += abs((signed char) line_buffer[i]); + } + if (est < best_filter_val) { + best_filter_val = est; + best_filter = filter_type; + } + } + if (filter_type != best_filter) { // If the last iteration already got us the best filter, don't redo it + stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, best_filter, line_buffer); + filter_type = best_filter; + } + } + // when we get here, filter_type contains the filter type, and line_buffer contains the data + filt[j*(x*n+1)] = (unsigned char) filter_type; + STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n); + } + STBIW_FREE(line_buffer); + zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level); + STBIW_FREE(filt); + if (!zlib) return 0; + + // each tag requires 12 bytes of overhead + out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12); + if (!out) return 0; + *out_len = 8 + 12+13 + 12+zlen + 12; + + o=out; + STBIW_MEMMOVE(o,sig,8); o+= 8; + stbiw__wp32(o, 13); // header length + stbiw__wptag(o, "IHDR"); + stbiw__wp32(o, x); + stbiw__wp32(o, y); + *o++ = 8; + *o++ = STBIW_UCHAR(ctype[n]); + *o++ = 0; + *o++ = 0; + *o++ = 0; + stbiw__wpcrc(&o,13); + + stbiw__wp32(o, zlen); + stbiw__wptag(o, "IDAT"); + STBIW_MEMMOVE(o, zlib, zlen); + o += zlen; + STBIW_FREE(zlib); + stbiw__wpcrc(&o, zlen); + + stbiw__wp32(o,0); + stbiw__wptag(o, "IEND"); + stbiw__wpcrc(&o,0); + + STBIW_ASSERT(o == out + *out_len); + + return out; +} + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) +{ + FILE *f; + int len; + unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); + if (png == NULL) return 0; + + f = stbiw__fopen(filename, "wb"); + if (!f) { STBIW_FREE(png); return 0; } + fwrite(png, 1, len, f); + fclose(f); + STBIW_FREE(png); + return 1; +} +#endif + +STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int stride_bytes) +{ + int len; + unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); + if (png == NULL) return 0; + func(context, png, len); + STBIW_FREE(png); + return 1; +} + + +/* *************************************************************************** + * + * JPEG writer + * + * This is based on Jon Olick's jo_jpeg.cpp: + * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html + */ + +static const unsigned char stbiw__jpg_ZigZag[] = { 0,1,5,6,14,15,27,28,2,4,7,13,16,26,29,42,3,8,12,17,25,30,41,43,9,11,18, + 24,31,40,44,53,10,19,23,32,39,45,52,54,20,22,33,38,46,51,55,60,21,34,37,47,50,56,59,61,35,36,48,49,57,58,62,63 }; + +static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) { + int bitBuf = *bitBufP, bitCnt = *bitCntP; + bitCnt += bs[1]; + bitBuf |= bs[0] << (24 - bitCnt); + while(bitCnt >= 8) { + unsigned char c = (bitBuf >> 16) & 255; + stbiw__putc(s, c); + if(c == 255) { + stbiw__putc(s, 0); + } + bitBuf <<= 8; + bitCnt -= 8; + } + *bitBufP = bitBuf; + *bitCntP = bitCnt; +} + +static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) { + float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p; + float z1, z2, z3, z4, z5, z11, z13; + + float tmp0 = d0 + d7; + float tmp7 = d0 - d7; + float tmp1 = d1 + d6; + float tmp6 = d1 - d6; + float tmp2 = d2 + d5; + float tmp5 = d2 - d5; + float tmp3 = d3 + d4; + float tmp4 = d3 - d4; + + // Even part + float tmp10 = tmp0 + tmp3; // phase 2 + float tmp13 = tmp0 - tmp3; + float tmp11 = tmp1 + tmp2; + float tmp12 = tmp1 - tmp2; + + d0 = tmp10 + tmp11; // phase 3 + d4 = tmp10 - tmp11; + + z1 = (tmp12 + tmp13) * 0.707106781f; // c4 + d2 = tmp13 + z1; // phase 5 + d6 = tmp13 - z1; + + // Odd part + tmp10 = tmp4 + tmp5; // phase 2 + tmp11 = tmp5 + tmp6; + tmp12 = tmp6 + tmp7; + + // The rotator is modified from fig 4-8 to avoid extra negations. + z5 = (tmp10 - tmp12) * 0.382683433f; // c6 + z2 = tmp10 * 0.541196100f + z5; // c2-c6 + z4 = tmp12 * 1.306562965f + z5; // c2+c6 + z3 = tmp11 * 0.707106781f; // c4 + + z11 = tmp7 + z3; // phase 5 + z13 = tmp7 - z3; + + *d5p = z13 + z2; // phase 6 + *d3p = z13 - z2; + *d1p = z11 + z4; + *d7p = z11 - z4; + + *d0p = d0; *d2p = d2; *d4p = d4; *d6p = d6; +} + +static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) { + int tmp1 = val < 0 ? -val : val; + val = val < 0 ? val-1 : val; + bits[1] = 1; + while(tmp1 >>= 1) { + ++bits[1]; + } + bits[0] = val & ((1<<bits[1])-1); +} + +static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf, int *bitCnt, float *CDU, int du_stride, float *fdtbl, int DC, const unsigned short HTDC[256][2], const unsigned short HTAC[256][2]) { + const unsigned short EOB[2] = { HTAC[0x00][0], HTAC[0x00][1] }; + const unsigned short M16zeroes[2] = { HTAC[0xF0][0], HTAC[0xF0][1] }; + int dataOff, i, j, n, diff, end0pos, x, y; + int DU[64]; + + // DCT rows + for(dataOff=0, n=du_stride*8; dataOff<n; dataOff+=du_stride) { + stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+1], &CDU[dataOff+2], &CDU[dataOff+3], &CDU[dataOff+4], &CDU[dataOff+5], &CDU[dataOff+6], &CDU[dataOff+7]); + } + // DCT columns + for(dataOff=0; dataOff<8; ++dataOff) { + stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+du_stride], &CDU[dataOff+du_stride*2], &CDU[dataOff+du_stride*3], &CDU[dataOff+du_stride*4], + &CDU[dataOff+du_stride*5], &CDU[dataOff+du_stride*6], &CDU[dataOff+du_stride*7]); + } + // Quantize/descale/zigzag the coefficients + for(y = 0, j=0; y < 8; ++y) { + for(x = 0; x < 8; ++x,++j) { + float v; + i = y*du_stride+x; + v = CDU[i]*fdtbl[j]; + // DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v + 0.5f)); + // ceilf() and floorf() are C99, not C89, but I /think/ they're not needed here anyway? + DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? v - 0.5f : v + 0.5f); + } + } + + // Encode DC + diff = DU[0] - DC; + if (diff == 0) { + stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]); + } else { + unsigned short bits[2]; + stbiw__jpg_calcBits(diff, bits); + stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]); + stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); + } + // Encode ACs + end0pos = 63; + for(; (end0pos>0)&&(DU[end0pos]==0); --end0pos) { + } + // end0pos = first element in reverse order !=0 + if(end0pos == 0) { + stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); + return DU[0]; + } + for(i = 1; i <= end0pos; ++i) { + int startpos = i; + int nrzeroes; + unsigned short bits[2]; + for (; DU[i]==0 && i<=end0pos; ++i) { + } + nrzeroes = i-startpos; + if ( nrzeroes >= 16 ) { + int lng = nrzeroes>>4; + int nrmarker; + for (nrmarker=1; nrmarker <= lng; ++nrmarker) + stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes); + nrzeroes &= 15; + } + stbiw__jpg_calcBits(DU[i], bits); + stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes<<4)+bits[1]]); + stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); + } + if(end0pos != 63) { + stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); + } + return DU[0]; +} + +static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void* data, int quality) { + // Constants that don't pollute global namespace + static const unsigned char std_dc_luminance_nrcodes[] = {0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0}; + static const unsigned char std_dc_luminance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; + static const unsigned char std_ac_luminance_nrcodes[] = {0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d}; + static const unsigned char std_ac_luminance_values[] = { + 0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08, + 0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28, + 0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59, + 0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89, + 0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6, + 0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2, + 0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa + }; + static const unsigned char std_dc_chrominance_nrcodes[] = {0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0}; + static const unsigned char std_dc_chrominance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; + static const unsigned char std_ac_chrominance_nrcodes[] = {0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77}; + static const unsigned char std_ac_chrominance_values[] = { + 0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91, + 0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26, + 0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58, + 0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87, + 0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4, + 0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda, + 0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa + }; + // Huffman tables + static const unsigned short YDC_HT[256][2] = { {0,2},{2,3},{3,3},{4,3},{5,3},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9}}; + static const unsigned short UVDC_HT[256][2] = { {0,2},{1,2},{2,2},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9},{1022,10},{2046,11}}; + static const unsigned short YAC_HT[256][2] = { + {10,4},{0,2},{1,2},{4,3},{11,4},{26,5},{120,7},{248,8},{1014,10},{65410,16},{65411,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {12,4},{27,5},{121,7},{502,9},{2038,11},{65412,16},{65413,16},{65414,16},{65415,16},{65416,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {28,5},{249,8},{1015,10},{4084,12},{65417,16},{65418,16},{65419,16},{65420,16},{65421,16},{65422,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {58,6},{503,9},{4085,12},{65423,16},{65424,16},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {59,6},{1016,10},{65430,16},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {122,7},{2039,11},{65438,16},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {123,7},{4086,12},{65446,16},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {250,8},{4087,12},{65454,16},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {504,9},{32704,15},{65462,16},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {505,9},{65470,16},{65471,16},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {506,9},{65479,16},{65480,16},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {1017,10},{65488,16},{65489,16},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {1018,10},{65497,16},{65498,16},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {2040,11},{65506,16},{65507,16},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {65515,16},{65516,16},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{0,0},{0,0},{0,0},{0,0},{0,0}, + {2041,11},{65525,16},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0} + }; + static const unsigned short UVAC_HT[256][2] = { + {0,2},{1,2},{4,3},{10,4},{24,5},{25,5},{56,6},{120,7},{500,9},{1014,10},{4084,12},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {11,4},{57,6},{246,8},{501,9},{2038,11},{4085,12},{65416,16},{65417,16},{65418,16},{65419,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {26,5},{247,8},{1015,10},{4086,12},{32706,15},{65420,16},{65421,16},{65422,16},{65423,16},{65424,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {27,5},{248,8},{1016,10},{4087,12},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{65430,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {58,6},{502,9},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{65438,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {59,6},{1017,10},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{65446,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {121,7},{2039,11},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{65454,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {122,7},{2040,11},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{65462,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {249,8},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{65470,16},{65471,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {503,9},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{65479,16},{65480,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {504,9},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{65488,16},{65489,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {505,9},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{65497,16},{65498,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {506,9},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{65506,16},{65507,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {2041,11},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{65515,16},{65516,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, + {16352,14},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{65525,16},{0,0},{0,0},{0,0},{0,0},{0,0}, + {1018,10},{32707,15},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0} + }; + static const int YQT[] = {16,11,10,16,24,40,51,61,12,12,14,19,26,58,60,55,14,13,16,24,40,57,69,56,14,17,22,29,51,87,80,62,18,22, + 37,56,68,109,103,77,24,35,55,64,81,104,113,92,49,64,78,87,103,121,120,101,72,92,95,98,112,100,103,99}; + static const int UVQT[] = {17,18,24,47,99,99,99,99,18,21,26,66,99,99,99,99,24,26,56,99,99,99,99,99,47,66,99,99,99,99,99,99, + 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99}; + static const float aasf[] = { 1.0f * 2.828427125f, 1.387039845f * 2.828427125f, 1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f, + 1.0f * 2.828427125f, 0.785694958f * 2.828427125f, 0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f }; + + int row, col, i, k, subsample; + float fdtbl_Y[64], fdtbl_UV[64]; + unsigned char YTable[64], UVTable[64]; + + if(!data || !width || !height || comp > 4 || comp < 1) { + return 0; + } + + quality = quality ? quality : 90; + subsample = quality <= 90 ? 1 : 0; + quality = quality < 1 ? 1 : quality > 100 ? 100 : quality; + quality = quality < 50 ? 5000 / quality : 200 - quality * 2; + + for(i = 0; i < 64; ++i) { + int uvti, yti = (YQT[i]*quality+50)/100; + YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti); + uvti = (UVQT[i]*quality+50)/100; + UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti); + } + + for(row = 0, k = 0; row < 8; ++row) { + for(col = 0; col < 8; ++col, ++k) { + fdtbl_Y[k] = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); + fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); + } + } + + // Write Headers + { + static const unsigned char head0[] = { 0xFF,0xD8,0xFF,0xE0,0,0x10,'J','F','I','F',0,1,1,0,0,1,0,1,0,0,0xFF,0xDB,0,0x84,0 }; + static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 }; + const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width), + 3,1,(unsigned char)(subsample?0x22:0x11),0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 }; + s->func(s->context, (void*)head0, sizeof(head0)); + s->func(s->context, (void*)YTable, sizeof(YTable)); + stbiw__putc(s, 1); + s->func(s->context, UVTable, sizeof(UVTable)); + s->func(s->context, (void*)head1, sizeof(head1)); + s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1); + s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values)); + stbiw__putc(s, 0x10); // HTYACinfo + s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1); + s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values)); + stbiw__putc(s, 1); // HTUDCinfo + s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1); + s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values)); + stbiw__putc(s, 0x11); // HTUACinfo + s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1); + s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values)); + s->func(s->context, (void*)head2, sizeof(head2)); + } + + // Encode 8x8 macroblocks + { + static const unsigned short fillBits[] = {0x7F, 7}; + int DCY=0, DCU=0, DCV=0; + int bitBuf=0, bitCnt=0; + // comp == 2 is grey+alpha (alpha is ignored) + int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0; + const unsigned char *dataR = (const unsigned char *)data; + const unsigned char *dataG = dataR + ofsG; + const unsigned char *dataB = dataR + ofsB; + int x, y, pos; + if(subsample) { + for(y = 0; y < height; y += 16) { + for(x = 0; x < width; x += 16) { + float Y[256], U[256], V[256]; + for(row = y, pos = 0; row < y+16; ++row) { + // row >= height => use last input row + int clamped_row = (row < height) ? row : height - 1; + int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; + for(col = x; col < x+16; ++col, ++pos) { + // if col >= width => use pixel from last input column + int p = base_p + ((col < width) ? col : (width-1))*comp; + float r = dataR[p], g = dataG[p], b = dataB[p]; + Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128; + U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b; + V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b; + } + } + DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+0, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); + DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+8, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); + DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+128, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); + DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+136, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); + + // subsample U,V + { + float subU[64], subV[64]; + int yy, xx; + for(yy = 0, pos = 0; yy < 8; ++yy) { + for(xx = 0; xx < 8; ++xx, ++pos) { + int j = yy*32+xx*2; + subU[pos] = (U[j+0] + U[j+1] + U[j+16] + U[j+17]) * 0.25f; + subV[pos] = (V[j+0] + V[j+1] + V[j+16] + V[j+17]) * 0.25f; + } + } + DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subU, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); + DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subV, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); + } + } + } + } else { + for(y = 0; y < height; y += 8) { + for(x = 0; x < width; x += 8) { + float Y[64], U[64], V[64]; + for(row = y, pos = 0; row < y+8; ++row) { + // row >= height => use last input row + int clamped_row = (row < height) ? row : height - 1; + int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; + for(col = x; col < x+8; ++col, ++pos) { + // if col >= width => use pixel from last input column + int p = base_p + ((col < width) ? col : (width-1))*comp; + float r = dataR[p], g = dataG[p], b = dataB[p]; + Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128; + U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b; + V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b; + } + } + + DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y, 8, fdtbl_Y, DCY, YDC_HT, YAC_HT); + DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, U, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); + DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, V, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); + } + } + } + + // Do the bit alignment of the EOI marker + stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits); + } + + // EOI + stbiw__putc(s, 0xFF); + stbiw__putc(s, 0xD9); + + return 1; +} + +STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality) +{ + stbi__write_context s = { 0 }; + stbi__start_write_callbacks(&s, func, context); + return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality); +} + + +#ifndef STBI_WRITE_NO_STDIO +STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality) +{ + stbi__write_context s = { 0 }; + if (stbi__start_write_file(&s,filename)) { + int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); + stbi__end_write_file(&s); + return r; + } else + return 0; +} +#endif + +#endif // STB_IMAGE_WRITE_IMPLEMENTATION + +/* Revision history + 1.16 (2021-07-11) + make Deflate code emit uncompressed blocks when it would otherwise expand + support writing BMPs with alpha channel + 1.15 (2020-07-13) unknown + 1.14 (2020-02-02) updated JPEG writer to downsample chroma channels + 1.13 + 1.12 + 1.11 (2019-08-11) + + 1.10 (2019-02-07) + support utf8 filenames in Windows; fix warnings and platform ifdefs + 1.09 (2018-02-11) + fix typo in zlib quality API, improve STB_I_W_STATIC in C++ + 1.08 (2018-01-29) + add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter + 1.07 (2017-07-24) + doc fix + 1.06 (2017-07-23) + writing JPEG (using Jon Olick's code) + 1.05 ??? + 1.04 (2017-03-03) + monochrome BMP expansion + 1.03 ??? + 1.02 (2016-04-02) + avoid allocating large structures on the stack + 1.01 (2016-01-16) + STBIW_REALLOC_SIZED: support allocators with no realloc support + avoid race-condition in crc initialization + minor compile issues + 1.00 (2015-09-14) + installable file IO function + 0.99 (2015-09-13) + warning fixes; TGA rle support + 0.98 (2015-04-08) + added STBIW_MALLOC, STBIW_ASSERT etc + 0.97 (2015-01-18) + fixed HDR asserts, rewrote HDR rle logic + 0.96 (2015-01-17) + add HDR output + fix monochrome BMP + 0.95 (2014-08-17) + add monochrome TGA output + 0.94 (2014-05-31) + rename private functions to avoid conflicts with stb_image.h + 0.93 (2014-05-27) + warning fixes + 0.92 (2010-08-01) + casts to unsigned char to fix warnings + 0.91 (2010-07-17) + first public release + 0.90 first internal release +*/ + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ |