diff --git a/OpenGLES-Application/0001-Adapter-Opengles-API.patch b/OpenGLES-Application/0001-Adapter-Opengles-API.patch new file mode 100644 index 0000000..0230b46 --- /dev/null +++ b/OpenGLES-Application/0001-Adapter-Opengles-API.patch @@ -0,0 +1,63 @@ +From c35b8a758218aafdca20c62a3a7049577fe5f2e2 Mon Sep 17 00:00:00 2001 +From: Wanghao Wei +Date: Fri, 29 Jan 2021 12:17:56 +0800 +Subject: [PATCH] Adapter Opengles API + +--- + CMakeLists.txt | 4 ++-- + src/internal.h | 4 +++- + src/window.c | 2 +- + 3 files changed, 6 insertions(+), 4 deletions(-) + +diff --git a/CMakeLists.txt b/CMakeLists.txt +index b915b58..818fd6f 100644 +--- a/CMakeLists.txt ++++ b/CMakeLists.txt +@@ -1,6 +1,6 @@ + set(CMAKE_LEGACY_CYGWIN_WIN32 OFF) + +-project(GLFW C) ++project(GLFW) + + cmake_minimum_required(VERSION 2.8.12) + +@@ -21,7 +21,7 @@ set(LIB_SUFFIX "" CACHE STRING "Takes an empty string or 64. Directory where lib + set_property(GLOBAL PROPERTY USE_FOLDERS ON) + + option(BUILD_SHARED_LIBS "Build shared libraries" OFF) +-option(GLFW_BUILD_EXAMPLES "Build the GLFW example programs" OFF) ++option(GLFW_BUILD_EXAMPLES "Build the GLFW example programs" ON) + option(GLFW_BUILD_TESTS "Build the GLFW test programs" OFF) + option(GLFW_BUILD_DOCS "Build the GLFW documentation" OFF) + option(GLFW_INSTALL "Generate installation target" OFF) +diff --git a/src/internal.h b/src/internal.h +index 8e84efd..d8b1f54 100644 +--- a/src/internal.h ++++ b/src/internal.h +@@ -45,7 +45,9 @@ + #error "You must not define any header option macros when compiling GLFW" + #endif + +-#define GLFW_INCLUDE_NONE ++#define GLFW_INCLUDE_ES3 ++#define GLFW_INCLUDE_GLEXT ++ + #include "../include/GLFW/glfw3.h" + + typedef int GLFWbool; +diff --git a/src/window.c b/src/window.c +index 5e74e6e..c579bd0 100644 +--- a/src/window.c ++++ b/src/window.c +@@ -236,7 +236,7 @@ void glfwDefaultWindowHints(void) + memset(&_glfw.hints, 0, sizeof(_glfw.hints)); + + // The default is OpenGL with minimum version 1.0 +- _glfw.hints.context.client = GLFW_OPENGL_API; ++ _glfw.hints.context.client = GLFW_OPENGL_ES_API; + _glfw.hints.context.source = GLFW_NATIVE_CONTEXT_API; + _glfw.hints.context.major = 1; + _glfw.hints.context.minor = 0; +-- +2.26.2 + diff --git a/OpenGLES-Application/0001-Add-opengles-demo.patch b/OpenGLES-Application/0001-Add-opengles-demo.patch new file mode 100644 index 0000000..d9ac170 --- /dev/null +++ b/OpenGLES-Application/0001-Add-opengles-demo.patch @@ -0,0 +1,8920 @@ +From bc769745ac466f4492c3f22d0dfde21dd022df3b Mon Sep 17 00:00:00 2001 +From: Wanghao Wei +Date: Fri, 29 Jan 2021 12:23:29 +0800 +Subject: [PATCH] Add opengles demo + +--- + examples/include/stb_image.h | 7194 ++++++++++++++++++++++++++++ + examples/include/stb_image_write.h | 1048 ++++ + examples/magic_box.cpp | 228 + + examples/offscreen.c | 175 + + examples/sharing.c | 223 + + 5 files changed, 8868 insertions(+) + create mode 100644 examples/include/stb_image.h + create mode 100644 examples/include/stb_image_write.h + create mode 100644 examples/magic_box.cpp + create mode 100644 examples/offscreen.c + create mode 100644 examples/sharing.c + +diff --git a/examples/include/stb_image.h b/examples/include/stb_image.h +new file mode 100644 +index 0000000..e98fadc +--- /dev/null ++++ b/examples/include/stb_image.h +@@ -0,0 +1,7194 @@ ++/* stb_image - v2.14 - public domain image loader - http://nothings.org/stb_image.h ++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-bit-per-channel (16 bpc not supported) ++ ++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. ++ ++ ++Revision 2.00 release notes: ++ ++- Progressive JPEG is now supported. ++ ++- PPM and PGM binary formats are now supported, thanks to Ken Miller. ++ ++- x86 platforms now make use of SSE2 SIMD instructions for ++JPEG decoding, and ARM platforms can use NEON SIMD if requested. ++This work was done by Fabian "ryg" Giesen. SSE2 is used by ++default, but NEON must be enabled explicitly; see docs. ++ ++With other JPEG optimizations included in this version, we see ++2x speedup on a JPEG on an x86 machine, and a 1.5x speedup ++on a JPEG on an ARM machine, relative to previous versions of this ++library. The same results will not obtain for all JPGs and for all ++x86/ARM machines. (Note that progressive JPEGs are significantly ++slower to decode than regular JPEGs.) This doesn't mean that this ++is the fastest JPEG decoder in the land; rather, it brings it ++closer to parity with standard libraries. If you want the fastest ++decode, look elsewhere. (See "Philosophy" section of docs below.) ++ ++See final bullet items below for more info on SIMD. ++ ++- Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing ++the memory allocator. Unlike other STBI libraries, these macros don't ++support a context parameter, so if you need to pass a context in to ++the allocator, you'll have to store it in a global or a thread-local ++variable. ++ ++- Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and ++STBI_NO_LINEAR. ++STBI_NO_HDR: suppress implementation of .hdr reader format ++STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API ++ ++- 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) ++ ++Note that you can define multiples of these, and you will get all ++of them ("only x" and "only y" is interpreted to mean "only x&y"). ++ ++- If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still ++want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB ++ ++- Compilation of all SIMD code can be suppressed with ++#define STBI_NO_SIMD ++It should not be necessary to disable SIMD unless you have issues ++compiling (e.g. using an x86 compiler which doesn't support SSE ++intrinsics or that doesn't support the method used to detect ++SSE2 support at run-time), and even those can be reported as ++bugs so I can refine the built-in compile-time checking to be ++smarter. ++ ++- The old STBI_SIMD system which allowed installing a user-defined ++IDCT etc. has been removed. If you need this, don't upgrade. My ++assumption is that almost nobody was doing this, and those who ++were will find the built-in SIMD more satisfactory anyway. ++ ++- RGB values computed for JPEG images are slightly different from ++previous versions of stb_image. (This is due to using less ++integer precision in SIMD.) The C code has been adjusted so ++that the same RGB values will be computed regardless of whether ++SIMD support is available, so your app should always produce ++consistent results. But these results are slightly different from ++previous versions. (Specifically, about 3% of available YCbCr values ++will compute different RGB results from pre-1.49 versions by +-1; ++most of the deviating values are one smaller in the G channel.) ++ ++- If you must produce consistent results with previous versions of ++stb_image, #define STBI_JPEG_OLD and you will get the same results ++you used to; however, you will not get the SIMD speedups for ++the YCbCr-to-RGB conversion step (although you should still see ++significant JPEG speedup from the other changes). ++ ++Please note that STBI_JPEG_OLD is a temporary feature; it will be ++removed in future versions of the library. It is only intended for ++near-term back-compatibility use. ++ ++ ++Latest revision history: ++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 ++2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA ++2.07 (2015-09-13) partial animated GIF support ++limited 16-bit PSD support ++minor bugs, code cleanup, and compiler warnings ++ ++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) ++Daniel Gibson (16-bit TGA) ++socks-the-fox (16-bit TGA) ++Optimizations & bugfixes ++Fabian "ryg" Giesen ++Arseny Kapoulkine ++ ++Bug & warning fixes ++Marc LeBlanc David Woo Guillaume George Martins Mozeiko ++Christpher Lloyd Martin Golini Jerry Jansson Joseph Thomson ++Dave Moore Roy Eltham Hayaki Saito Phil Jordan ++Won Chun Luke Graham Johan Duparc Nathan Reed ++the Horde3D community Thomas Ruf Ronny Chevalier Nick Verigakis ++Janez Zemva John Bartholomew Michal Cichon github:svdijk ++Jonathan Blow Ken Hamada Tero Hanninen Baldur Karlsson ++Laurent Gomila Cort Stratton Sergio Gonzalez github:romigrou ++Aruelien Pocheville Thibault Reuille Cass Everitt Matthew Gregan ++Ryamond Barbiero Paul Du Bois Engin Manap github:snagar ++Michaelangel007@github Oriol Ferrer Mesia Dale Weiler github:Zelex ++Philipp Wiesemann Josh Tobin github:rlyeh github:grim210@github ++Blazej Dariusz Roszkowski github:sammyhw ++ ++ ++LICENSE ++ ++This software is dual-licensed to the public domain and under the following ++license: you are granted a perpetual, irrevocable license to copy, modify, ++publish, and distribute this file as you see fit. ++ ++*/ ++ ++#ifndef STBI_INCLUDE_STB_IMAGE_H ++#define STBI_INCLUDE_STB_IMAGE_H ++ ++// DOCUMENTATION ++// ++// Limitations: ++// - no 16-bit-per-channel PNG ++// - no 12-bit-per-channel JPEG ++// - no JPEGs with arithmetic coding ++// - no 1-bit BMP ++// - 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 'req_comp' if req_comp is non-zero, or *comp otherwise. ++// If req_comp is non-zero, *comp has the number of components that _would_ ++// have been output otherwise. E.g. if you set req_comp to 4, you will always ++// get RGBA output, but you can check *comp 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, *comp 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. ++// ++// =========================================================================== ++// ++// 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 ++// make more explicit reasons why performance can't be emphasized. ++// ++// - Portable ("ease of use") ++// - Small 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. ++// ++// The output of the JPEG decoder is slightly different from versions where ++// SIMD support was introduced (that is, for versions before 1.49). The ++// difference is only +-1 in the 8-bit RGB channels, and only on a small ++// fraction of pixels. You can force the pre-1.49 behavior by defining ++// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path ++// and hence cost some performance. ++// ++// 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 now supports loading HDR images in general, and currently ++// the Radiance .HDR file format, although the support is provided ++// generically. 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: ++// ++// By default we convert iphone-formatted PNGs back to RGB, even though ++// they are internally encoded differently. You can disable this conversion ++// by by calling stbi_convert_iphone_png_to_rgb(0), in which case ++// you will always just get the native iphone "format" through (which ++// is BGR stored in RGB). ++// ++// 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). ++// ++ ++ ++#ifndef STBI_NO_STDIO ++#include ++#endif // STBI_NO_STDIO ++ ++#define STBI_VERSION 1 ++ ++enum ++{ ++ STBI_default = 0, // only used for req_comp ++ ++ STBI_grey = 1, ++ STBI_grey_alpha = 2, ++ STBI_rgb = 3, ++ STBI_rgb_alpha = 4 ++}; ++ ++typedef unsigned char stbi_uc; ++typedef unsigned short stbi_us; ++ ++#ifdef __cplusplus ++extern "C" { ++#endif ++ ++#ifdef STB_IMAGE_STATIC ++#define STBIDEF static ++#else ++#define STBIDEF extern ++#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(char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); ++ 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_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 ++ ++ //////////////////////////////////// ++ // ++ // 16-bits-per-channel interface ++ // ++ ++ STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); ++#ifndef STBI_NO_STDIO ++ STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels); ++#endif ++ // @TODO the other variants ++ ++ //////////////////////////////////// ++ // ++ // float-per-channel interface ++ // ++#ifndef STBI_NO_LINEAR ++ STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *channels_in_file, int desired_channels); ++ 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_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 ++ // NOT 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); ++ ++#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); ++ ++#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); ++ ++ // 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 ++#include // ptrdiff_t on osx ++#include ++#include ++#include ++ ++#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) ++#include // ldexp ++#endif ++ ++#ifndef STBI_NO_STDIO ++#include ++#endif ++ ++#ifndef STBI_ASSERT ++#include ++#define STBI_ASSERT(x) assert(x) ++#endif ++ ++ ++#ifndef _MSC_VER ++#ifdef __cplusplus ++#define stbi_inline inline ++#else ++#define stbi_inline ++#endif ++#else ++#define stbi_inline __forceinline ++#endif ++ ++ ++#ifdef _MSC_VER ++typedef unsigned short stbi__uint16; ++typedef signed short stbi__int16; ++typedef unsigned int stbi__uint32; ++typedef signed int stbi__int32; ++#else ++#include ++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) >> (32 - (y)))) ++#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(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) ++// NOTE: not clear do we actually need this for the 64-bit path? ++// gcc doesn't support sse2 intrinsics unless you compile with -msse2, ++// (but compiling with -msse2 allows the compiler to use SSE2 everywhere; ++// this is just broken and gcc are jerks for not fixing it properly ++// http://www.virtualdub.org/blog/pivot/entry.php?id=363 ) ++#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 ++ ++#ifdef _MSC_VER ++ ++#if _MSC_VER >= 1400 // not VC6 ++#include // __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 ++ ++static int stbi__sse2_available() ++{ ++ int info3 = stbi__cpuid3(); ++ return ((info3 >> 26) & 1) != 0; ++} ++#else // assume GCC-style if not VC++ ++#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) ++ ++static int stbi__sse2_available() ++{ ++#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later ++ // GCC 4.8+ has a nice way to do this ++ return __builtin_cpu_supports("sse2"); ++#else ++ // portable way to do this, preferably without using GCC inline ASM? ++ // just bail for now. ++ return 0; ++#endif ++} ++#endif ++#endif ++ ++// ARM NEON ++#if defined(STBI_NO_SIMD) && defined(STBI_NEON) ++#undef STBI_NEON ++#endif ++ ++#ifdef STBI_NEON ++#include ++// assume GCC or Clang on ARM targets ++#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) ++#endif ++ ++#ifndef STBI_SIMD_ALIGN ++#define STBI_SIMD_ALIGN(type, name) type name ++#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]; ++ ++ 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->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->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) ++{ ++ fseek((FILE*)user, n, SEEK_CUR); ++} ++ ++static int stbi__stdio_eof(void *user) ++{ ++ return feof((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); ++#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); ++#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 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); ++#endif ++ ++// this is not threadsafe ++static const char *stbi__g_failure_reason; ++ ++STBIDEF const char *stbi_failure_reason(void) ++{ ++ return stbi__g_failure_reason; ++} ++ ++static int stbi__err(const char *str) ++{ ++ stbi__g_failure_reason = str; ++ return 0; ++} ++ ++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; ++} ++ ++// 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); ++} ++ ++// 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 ++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); ++} ++ ++// 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); ++} ++ ++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); ++} ++ ++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); ++} ++ ++// 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 = 0; ++ ++STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) ++{ ++ stbi__vertically_flip_on_load = flag_true_if_should_flip; ++} ++ ++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; ++ ++#ifndef STBI_NO_JPEG ++ if (stbi__jpeg_test(s)) return stbi__jpeg_load(s, x, y, comp, req_comp, ri); ++#endif ++#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); ++#endif ++#ifndef STBI_NO_PIC ++ if (stbi__pic_test(s)) return stbi__pic_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 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; ++ ++ if (ri.bits_per_channel != 8) { ++ STBI_ASSERT(ri.bits_per_channel == 16); ++ 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 w = *x, h = *y; ++ int channels = req_comp ? req_comp : *comp; ++ int row, col, z; ++ stbi_uc *image = (stbi_uc *)result; ++ ++ // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once ++ for (row = 0; row < (h >> 1); row++) { ++ for (col = 0; col < w; col++) { ++ for (z = 0; z < channels; z++) { ++ stbi_uc temp = image[(row * w + col) * channels + z]; ++ image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z]; ++ image[((h - row - 1) * w + col) * channels + z] = temp; ++ } ++ } ++ } ++ } ++ ++ 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; ++ ++ if (ri.bits_per_channel != 16) { ++ STBI_ASSERT(ri.bits_per_channel == 8); ++ 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 w = *x, h = *y; ++ int channels = req_comp ? req_comp : *comp; ++ int row, col, z; ++ stbi__uint16 *image = (stbi__uint16 *)result; ++ ++ // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once ++ for (row = 0; row < (h >> 1); row++) { ++ for (col = 0; col < w; col++) { ++ for (z = 0; z < channels; z++) { ++ stbi__uint16 temp = image[(row * w + col) * channels + z]; ++ image[(row * w + col) * channels + z] = image[((h - row - 1) * w + col) * channels + z]; ++ image[((h - row - 1) * w + col) * channels + z] = temp; ++ } ++ } ++ } ++ } ++ ++ return (stbi__uint16 *)result; ++} ++ ++#ifndef STBI_NO_HDR ++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 w = *x, h = *y; ++ int depth = req_comp ? req_comp : *comp; ++ int row, col, z; ++ float temp; ++ ++ // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once ++ for (row = 0; row < (h >> 1); row++) { ++ for (col = 0; col < w; col++) { ++ for (z = 0; z < depth; z++) { ++ temp = result[(row * w + col) * depth + z]; ++ result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z]; ++ result[((h - row - 1) * w + col) * depth + z] = temp; ++ } ++ } ++ } ++ } ++} ++#endif ++ ++#ifndef STBI_NO_STDIO ++ ++static FILE *stbi__fopen(char const *filename, char const *mode) ++{ ++ FILE *f; ++#if 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_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_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 ++ stbi__context s; ++ stbi__start_file(&s, f); ++ return stbi__hdr_test(&s); ++#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); ++ 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; ++} ++ ++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; ++} ++ ++static void stbi__skip(stbi__context *s, int n) ++{ ++ 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; ++} ++ ++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; ++} ++ ++static int stbi__get16be(stbi__context *s) ++{ ++ int z = stbi__get8(s); ++ return (z << 8) + stbi__get8(s); ++} ++ ++static stbi__uint32 stbi__get32be(stbi__context *s) ++{ ++ stbi__uint32 z = stbi__get16be(s); ++ return (z << 16) + stbi__get16be(s); ++} ++ ++#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); ++ return z + (stbi__get16le(s) << 16); ++} ++#endif ++ ++#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings ++ ++ ++////////////////////////////////////////////////////////////////////////////// ++// ++// 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); ++} ++ ++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); ++ } ++#undef STBI__CASE ++ } ++ ++ STBI_FREE(data); ++ return good; ++} ++ ++static stbi__uint16 stbi__compute_y_16(int r, int g, int b) ++{ ++ return (stbi__uint16)(((r * 77) + (g * 150) + (29 * b)) >> 8); ++} ++ ++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); ++ } ++#undef STBI__CASE ++ } ++ ++ STBI_FREE(data); ++ return good; ++} ++ ++#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 (k < comp) output[i*comp + k] = data[i*comp + k] / 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_uc 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 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, 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); ++ 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 >= (1 << 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 += (-1 << 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 << 8) + (run << 4) + (len + magbits)); ++ } ++ } ++ } ++} ++ ++static void stbi__grow_buffer_unsafe(stbi__jpeg *j) ++{ ++ do { ++ int b = j->nomore ? 0 : stbi__get8(j->s); ++ if (b == 0xff) { ++ int c = stbi__get8(j->s); ++ 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 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]; ++ 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<code_bits < n) stbi__grow_buffer_unsafe(j); ++ ++ sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB ++ k = stbi_lrot(j->code_buffer, n); ++ STBI_ASSERT(n >= 0 && n < (int)(sizeof(stbi__bmask) / sizeof(*stbi__bmask))); ++ j->code_buffer = k & ~stbi__bmask[n]; ++ k &= stbi__bmask[n]; ++ j->code_bits -= n; ++ return k + (stbi__jbias[n] & ~sgn); ++} ++ ++// 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); ++ 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); ++ 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 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_uc *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) 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; ++ dc = j->img_comp[b].dc_pred + diff; ++ j->img_comp[b].dc_pred = dc; ++ 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 ++ 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); ++ diff = t ? stbi__extend_receive(j, t) : 0; ++ ++ dc = j->img_comp[b].dc_pred + diff; ++ j->img_comp[b].dc_pred = dc; ++ data[0] = (short)(dc << 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 ++ j->code_buffer <<= s; ++ j->code_bits -= s; ++ zig = stbi__jpeg_dezigzag[k++]; ++ data[zig] = (short)((r >> 8) << 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) << 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) << 12) ++ ++// 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] << 2; ++ 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); ++ 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 = 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_uc *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; ++ int t = q & 15, i; ++ if (p != 0) 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__get8(z->s); ++ L -= 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]; ++ } ++ 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) { ++ stbi__skip(z->s, stbi__get16be(z->s) - 2); ++ return 1; ++ } ++ return 0; ++} ++ ++// 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 ++ c = stbi__get8(s); ++ if (c != 3 && c != 1) return stbi__err("bad component count", "Corrupt JPEG"); // JFIF requires ++ 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 unsigned char rgb[3] = { 'R', 'G', 'B' }; ++ z->img_comp[i].id = stbi__get8(s); ++ if (z->img_comp[i].id != i + 1) // JFIF requires ++ if (z->img_comp[i].id != i) { // some version of jpegtran outputs non-JFIF-compliant files! ++ // somethings output this (see http://fileformats.archiveteam.org/wiki/JPEG#Color_format) ++ if (z->img_comp[i].id != rgb[i]) ++ return stbi__err("bad component ID", "Corrupt JPEG"); ++ ++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; ++ } ++ ++ // 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->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; ++} ++ ++// 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) { ++ // handle 0s at the end of image data from IP Kamera 9060 ++ while (!stbi__at_eof(j->s)) { ++ int x = stbi__get8(j->s); ++ if (x == 255) { ++ j->marker = stbi__get8(j->s); ++ break; ++ } ++ else if (x != 0) { ++ return stbi__err("junk before marker", "Corrupt JPEG"); ++ } ++ } ++ // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 ++ } ++ } ++ else { ++ if (!stbi__process_marker(j, m)) return 0; ++ } ++ 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; ++} ++ ++#ifdef STBI_JPEG_OLD ++// this is the same YCbCr-to-RGB calculation that stb_image has used ++// historically before the algorithm changes in 1.49 ++#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) ++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] << 16) + 32768; // rounding ++ int r, g, b; ++ int cr = pcr[i] - 128; ++ int cb = pcb[i] - 128; ++ r = y_fixed + cr*float2fixed(1.40200f); ++ g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); ++ b = y_fixed + cb*float2fixed(1.77200f); ++ r >>= 16; ++ g >>= 16; ++ b >>= 16; ++ 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; ++ } ++} ++#else ++// 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 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* float2fixed(1.40200f); ++ g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); ++ b = y_fixed + cb* 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 ++ ++#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* float2fixed(1.40200f); ++ g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); ++ b = y_fixed + cb* 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; ++#ifndef STBI_JPEG_OLD ++ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; ++#endif ++ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; ++ } ++#endif ++ ++#ifdef STBI_NEON ++ j->idct_block_kernel = stbi__idct_simd; ++#ifndef STBI_JPEG_OLD ++ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; ++#endif ++ 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; ++ ++static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) ++{ ++ int n, decode_n; ++ 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; ++ ++ if (z->s->img_n == 3 && n < 3) ++ decode_n = 1; ++ else ++ decode_n = z->s->img_n; ++ ++ // resample and color-convert ++ { ++ int k; ++ unsigned int i, j; ++ stbi_uc *output; ++ stbi_uc *coutput[4]; ++ ++ 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 (z->rgb == 3) { ++ 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 ++ 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 { ++ 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; // 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)); ++ 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; ++ j.s = s; ++ stbi__setup_jpeg(&j); ++ r = stbi__decode_jpeg_header(&j, STBI__SCAN_type); ++ stbi__rewind(s); ++ 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; ++ 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))); ++ 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) ++ ++// 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[288]; ++ stbi__uint16 value[288]; ++} 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, 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; ++ 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 stbi_uc stbi__zget8(stbi__zbuf *z) ++{ ++ if (z->zbuffer >= z->zbuffer_end) return 0; ++ return *z->zbuffer++; ++} ++ ++static void stbi__fill_bits(stbi__zbuf *z) ++{ ++ do { ++ STBI_ASSERT(z->code_buffer < (1U << z->num_bits)); ++ 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]; ++ STBI_ASSERT(z->size[b] == s); ++ 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) 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; ++ int cur, limit, old_limit; ++ z->zout = zout; ++ if (!z->z_expandable) return stbi__err("output buffer limit", "Corrupt PNG"); ++ cur = (int)(z->zout - z->zout_start); ++ limit = old_limit = (int)(z->zout_end - z->zout_start); ++ while (cur + n > limit) ++ 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 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 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 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 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; ++ return 1; ++ } ++ 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) return stbi__err("bad huffman code", "Corrupt PNG"); ++ 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 (zout + len > a->zout_end) { ++ 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 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 { ++ STBI_ASSERT(c == 18); ++ c = stbi__zreceive(a, 7) + 11; ++ } ++ 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; ++ } ++ STBI_ASSERT(a->num_bits == 0); ++ // 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 ((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; ++} ++ ++// @TODO: should statically initialize these for optimal thread safety ++static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32]; ++static void stbi__init_zdefaults(void) ++{ ++ 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; ++ 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__zdefault_distance[31]) stbi__init_zdefaults(); ++ if (!stbi__zbuild_huffman(&a->z_length, stbi__zdefault_length, 288)) 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 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 filters used for first scanline to avoid needing a dummy row of 0s ++ STBI__F_avg_first, ++ STBI__F_paeth_first ++}; ++ ++static stbi_uc first_row_filter[5] = ++{ ++ STBI__F_none, ++ STBI__F_sub, ++ STBI__F_none, ++ STBI__F_avg_first, ++ STBI__F_paeth_first ++}; ++ ++static int stbi__paeth(int a, int b, int c) ++{ ++ int p = a + b - c; ++ int pa = abs(p - a); ++ int pb = abs(p - b); ++ int pc = abs(p - c); ++ if (pa <= pb && pa <= pc) return a; ++ if (pb <= pc) return b; ++ return c; ++} ++ ++static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; ++ ++// 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; ++ 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"); ++ ++ img_width_bytes = (((img_n * x * depth) + 7) >> 3); ++ img_len = (img_width_bytes + 1) * y; ++ if (s->img_x == x && s->img_y == y) { ++ if (raw_len != img_len) return stbi__err("not enough pixels", "Corrupt PNG"); ++ } ++ else { // interlaced: ++ if (raw_len < img_len) return stbi__err("not enough pixels", "Corrupt PNG"); ++ } ++ ++ for (j = 0; j < y; ++j) { ++ stbi_uc *cur = a->out + stride*j; ++ stbi_uc *prior = cur - stride; ++ int filter = *raw++; ++ ++ if (filter > 4) ++ return stbi__err("invalid filter", "Corrupt PNG"); ++ ++ if (depth < 8) { ++ STBI_ASSERT(img_width_bytes <= x); ++ cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place ++ filter_bytes = 1; ++ width = img_width_bytes; ++ } ++ ++ // if first row, use special filter that doesn't sample previous row ++ if (j == 0) filter = first_row_filter[filter]; ++ ++ // handle first byte explicitly ++ for (k = 0; k < filter_bytes; ++k) { ++ switch (filter) { ++ case STBI__F_none: cur[k] = raw[k]; break; ++ case STBI__F_sub: cur[k] = raw[k]; break; ++ case STBI__F_up: cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break; ++ case STBI__F_avg: cur[k] = STBI__BYTECAST(raw[k] + (prior[k] >> 1)); break; ++ case STBI__F_paeth: cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0, prior[k], 0)); break; ++ case STBI__F_avg_first: cur[k] = raw[k]; break; ++ case STBI__F_paeth_first: cur[k] = raw[k]; break; ++ } ++ } ++ ++ if (depth == 8) { ++ if (img_n != out_n) ++ cur[img_n] = 255; // first pixel ++ raw += img_n; ++ cur += out_n; ++ prior += out_n; ++ } ++ else if (depth == 16) { ++ if (img_n != out_n) { ++ cur[filter_bytes] = 255; // first pixel top byte ++ cur[filter_bytes + 1] = 255; // first pixel bottom byte ++ } ++ raw += filter_bytes; ++ cur += output_bytes; ++ prior += output_bytes; ++ } ++ else { ++ raw += 1; ++ cur += 1; ++ prior += 1; ++ } ++ ++ // this is a little gross, so that we don't switch per-pixel or per-component ++ if (depth < 8 || img_n == out_n) { ++ int nk = (width - 1)*filter_bytes; ++#define STBI__CASE(f) \ ++ case f: \ ++ for (k=0; k < nk; ++k) ++ switch (filter) { ++ // "none" filter turns into a memcpy here; make that explicit. ++ case STBI__F_none: memcpy(cur, raw, nk); break; ++ STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k - filter_bytes]); } break; ++ STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break; ++ STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k - filter_bytes]) >> 1)); } break; ++ STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - filter_bytes], prior[k], prior[k - filter_bytes])); } break; ++ STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k - filter_bytes] >> 1)); } break; ++ STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - filter_bytes], 0, 0)); } break; ++ } ++#undef STBI__CASE ++ raw += nk; ++ } ++ else { ++ STBI_ASSERT(img_n + 1 == out_n); ++#define STBI__CASE(f) \ ++ case f: \ ++ for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \ ++ for (k=0; k < filter_bytes; ++k) ++ switch (filter) { ++ STBI__CASE(STBI__F_none) { cur[k] = raw[k]; } break; ++ STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k - output_bytes]); } break; ++ STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break; ++ STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k - output_bytes]) >> 1)); } break; ++ STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - output_bytes], prior[k], prior[k - output_bytes])); } break; ++ STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k - output_bytes] >> 1)); } break; ++ STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k - output_bytes], 0, 0)); } break; ++ } ++#undef STBI__CASE ++ ++ // the loop above sets the high byte of the pixels' alpha, but for ++ // 16 bit png files we also need the low byte set. we'll do that here. ++ if (depth == 16) { ++ cur = a->out + stride*j; // start at the beginning of the row again ++ for (i = 0; i < x; ++i, cur += output_bytes) { ++ cur[filter_bytes + 1] = 255; ++ } ++ } ++ } ++ } ++ ++ // we make a separate pass to expand bits to pixels; for performance, ++ // this could run two scanlines behind the above code, so it won't ++ // intefere with filtering but will still be in the cache. ++ if (depth < 8) { ++ for (j = 0; j < y; ++j) { ++ stbi_uc *cur = a->out + stride*j; ++ stbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes; ++ // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit ++ // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop ++ stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range ++ ++ // note that the final byte might overshoot and write more data than desired. ++ // we can allocate enough data that this never writes out of memory, but it ++ // could also overwrite the next scanline. can it overwrite non-empty data ++ // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel. ++ // so we need to explicitly clamp the final ones ++ ++ if (depth == 4) { ++ for (k = x*img_n; k >= 2; k -= 2, ++in) { ++ *cur++ = scale * ((*in >> 4)); ++ *cur++ = scale * ((*in) & 0x0f); ++ } ++ if (k > 0) *cur++ = scale * ((*in >> 4)); ++ } ++ else if (depth == 2) { ++ for (k = x*img_n; k >= 4; k -= 4, ++in) { ++ *cur++ = scale * ((*in >> 6)); ++ *cur++ = scale * ((*in >> 4) & 0x03); ++ *cur++ = scale * ((*in >> 2) & 0x03); ++ *cur++ = scale * ((*in) & 0x03); ++ } ++ if (k > 0) *cur++ = scale * ((*in >> 6)); ++ if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03); ++ if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03); ++ } ++ else if (depth == 1) { ++ for (k = x*img_n; k >= 8; k -= 8, ++in) { ++ *cur++ = scale * ((*in >> 7)); ++ *cur++ = scale * ((*in >> 6) & 0x01); ++ *cur++ = scale * ((*in >> 5) & 0x01); ++ *cur++ = scale * ((*in >> 4) & 0x01); ++ *cur++ = scale * ((*in >> 3) & 0x01); ++ *cur++ = scale * ((*in >> 2) & 0x01); ++ *cur++ = scale * ((*in >> 1) & 0x01); ++ *cur++ = scale * ((*in) & 0x01); ++ } ++ if (k > 0) *cur++ = scale * ((*in >> 7)); ++ if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01); ++ if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01); ++ if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01); ++ if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01); ++ if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01); ++ if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01); ++ } ++ if (img_n != out_n) { ++ int q; ++ // insert alpha = 255 ++ cur = a->out + stride*j; ++ if (img_n == 1) { ++ for (q = x - 1; q >= 0; --q) { ++ cur[q * 2 + 1] = 255; ++ cur[q * 2 + 0] = cur[q]; ++ } ++ } ++ else { ++ STBI_ASSERT(img_n == 3); ++ for (q = x - 1; q >= 0; --q) { ++ cur[q * 4 + 3] = 255; ++ cur[q * 4 + 2] = cur[q * 3 + 2]; ++ cur[q * 4 + 1] = cur[q * 3 + 1]; ++ cur[q * 4 + 0] = cur[q * 3 + 0]; ++ } ++ } ++ } ++ } ++ } ++ else if (depth == 16) { ++ // force the image data from big-endian to platform-native. ++ // this is done in a separate pass due to the decoding relying ++ // on the data being untouched, but could probably be done ++ // per-line during decode if care is taken. ++ stbi_uc *cur = a->out; ++ stbi__uint16 *cur16 = (stbi__uint16*)cur; ++ ++ for (i = 0; i < x*y*out_n; ++i, cur16++, cur += 2) { ++ *cur16 = (cur[0] << 8) | cur[1]; ++ } ++ } ++ ++ 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); ++ 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 = 0; ++static int stbi__de_iphone_flag = 0; ++ ++STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) ++{ ++ stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; ++} ++ ++STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) ++{ ++ stbi__de_iphone_flag = flag_true_if_should_convert; ++} ++ ++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) { ++ p[0] = p[2] * 255 / a; ++ p[1] = p[1] * 255 / a; ++ p[2] = t * 255 / 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) (((a) << 24) + ((b) << 16) + ((c) << 8) + (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]; ++ 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); if (s->img_x > (1 << 24)) return stbi__err("too large", "Very large image (corrupt?)"); ++ s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) 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"); ++ if (scan == STBI__SCAN_header) return 1; ++ } ++ 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"); ++ // if 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; ++ if (z->depth == 16) { ++ for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is ++ } ++ else { ++ for (k = 0; k < s->img_n; ++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) { s->img_n = pal_img_n; return 1; } ++ 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; ++ } ++ STBI_FREE(z->expanded); z->expanded = NULL; ++ 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 ++ ri->bits_per_channel = p->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); ++} ++#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, z >>= 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; ++} ++ ++static int stbi__shiftsigned(int v, int shift, int bits) ++{ ++ int result; ++ int z = 0; ++ ++ if (shift < 0) v <<= -shift; ++ else v >>= shift; ++ result = v; ++ ++ z = bits; ++ while (z < 8) { ++ result += v >> z; ++ z += bits; ++ } ++ return result; ++} ++ ++typedef struct ++{ ++ int bpp, offset, hsz; ++ unsigned int mr, mg, mb, ma, all_a; ++} stbi__bmp_data; ++ ++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; ++ ++ 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 (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit"); ++ if (hsz != 12) { ++ int compress = stbi__get32le(s); ++ if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); ++ 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) { ++ 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 { ++ info->mr = 31u << 10; ++ info->mg = 31u << 5; ++ info->mb = 31u << 0; ++ } ++ } ++ else if (compress == 3) { ++ info->mr = stbi__get32le(s); ++ info->mg = stbi__get32le(s); ++ info->mb = stbi__get32le(s); ++ // 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 { ++ 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); ++ 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); ++ ++ 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 - 14 - 24) / 3; ++ } ++ else { ++ if (info.bpp < 16) ++ psize = (info.offset - 14 - info.hsz) >> 2; ++ } ++ ++ 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 - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); ++ 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; ++ 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 - 14 - 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); ++ } ++ 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)); ++ 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; ++ // else: fall-through ++ case 15: if (is_rgb16) *is_rgb16 = 1; ++ return STBI_rgb; ++ case 24: // fall-through ++ 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); ++ ++ // 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) ++ { ++ // 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; ++ // 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); ++ ++ // 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 preceeded 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; ytype) { ++ default: ++ return stbi__errpuc("bad format", "packet has bad compression type"); ++ ++ case 0: {//uncompressed ++ int x; ++ ++ for (x = 0; xchannel, 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; ichannel, 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; ichannel, dest, value); ++ } ++ else { // Raw ++ ++count; ++ if (count>left) return stbi__errpuc("bad file", "scanline overrun"); ++ ++ for (i = 0; ichannel, 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; ++ STBI_NOTUSED(ri); ++ ++ for (i = 0; i<92; ++i) ++ stbi__get8(s); ++ ++ x = stbi__get16be(s); ++ y = stbi__get16be(s); ++ 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); ++ 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, *old_out; // output buffer (always 4 components) ++ int flags, bgindex, ratio, transparent, eflags, delay; ++ stbi_uc pal[256][4]; ++ stbi_uc lpal[256][4]; ++ stbi__gif_lzw codes[4096]; ++ 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; ++} 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 (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 (!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; ++ ++ // 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; ++ ++ p = &g->out[g->cur_x + g->cur_y]; ++ c = &g->color_table[g->codes[code].suffix * 4]; ++ ++ if (c[3] >= 128) { ++ 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 > 4096) 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"); ++ } ++ } ++ } ++} ++ ++static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1) ++{ ++ int x, y; ++ stbi_uc *c = g->pal[g->bgindex]; ++ for (y = y0; y < y1; y += 4 * g->w) { ++ for (x = x0; x < x1; x += 4) { ++ stbi_uc *p = &g->out[y + x]; ++ p[0] = c[2]; ++ p[1] = c[1]; ++ p[2] = c[0]; ++ p[3] = 0; ++ } ++ } ++} ++ ++// this function is designed to support animated gifs, although stb_image doesn't support it ++static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp) ++{ ++ int i; ++ stbi_uc *prev_out = 0; ++ ++ if (g->out == 0 && !stbi__gif_header(s, g, comp, 0)) ++ return 0; // stbi__g_failure_reason set by stbi__gif_header ++ ++ if (!stbi__mad3sizes_valid(g->w, g->h, 4, 0)) ++ return stbi__errpuc("too large", "GIF too large"); ++ ++ prev_out = g->out; ++ g->out = (stbi_uc *)stbi__malloc_mad3(4, g->w, g->h, 0); ++ if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory"); ++ ++ switch ((g->eflags & 0x1C) >> 2) { ++ case 0: // unspecified (also always used on 1st frame) ++ stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h); ++ break; ++ case 1: // do not dispose ++ if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); ++ g->old_out = prev_out; ++ break; ++ case 2: // dispose to background ++ if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h); ++ stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y); ++ break; ++ case 3: // dispose to previous ++ if (g->old_out) { ++ for (i = g->start_y; i < g->max_y; i += 4 * g->w) ++ memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x); ++ } ++ break; ++ } ++ ++ for (;;) { ++ switch (stbi__get8(s)) { ++ case 0x2C: /* Image Descriptor */ ++ { ++ int prev_trans = -1; ++ 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; ++ ++ 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) { ++ if (g->transparent >= 0 && (g->eflags & 0x01)) { ++ prev_trans = g->pal[g->transparent][3]; ++ g->pal[g->transparent][3] = 0; ++ } ++ 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 == NULL) return NULL; ++ ++ if (prev_trans != -1) ++ g->pal[g->transparent][3] = (stbi_uc)prev_trans; ++ ++ return o; ++ } ++ ++ case 0x21: // Comment Extension. ++ { ++ int len; ++ if (stbi__get8(s) == 0xF9) { // Graphic Control Extension. ++ len = stbi__get8(s); ++ if (len == 4) { ++ g->eflags = stbi__get8(s); ++ g->delay = stbi__get16le(s); ++ g->transparent = stbi__get8(s); ++ } ++ 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"); ++ } ++ } ++ ++ STBI_NOTUSED(req_comp); ++} ++ ++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 = (stbi__gif*)stbi__malloc(sizeof(stbi__gif)); ++ memset(g, 0, sizeof(*g)); ++ STBI_NOTUSED(ri); ++ ++ u = stbi__gif_load_next(s, g, comp, req_comp); ++ if (u == (stbi_uc *)s) u = 0; // end of animated gif marker ++ if (u) { ++ *x = g->w; ++ *y = g->h; ++ if (req_comp && req_comp != 4) ++ u = stbi__convert_format(u, 4, req_comp, g->w, g->h); ++ } ++ else if (g->out) ++ STBI_FREE(g->out); ++ STBI_FREE(g); ++ 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); ++ ++ *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 > 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 > 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; ++ ++ 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); ++ stbi__rewind(s); ++ if (p == NULL) ++ return 0; ++ *x = s->img_x; ++ *y = s->img_y; ++ *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; ++ 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); ++ if (stbi__get16be(s) != 8) { ++ stbi__rewind(s); ++ return 0; ++ } ++ if (stbi__get16be(s) != 3) { ++ stbi__rewind(s); ++ return 0; ++ } ++ *comp = 4; ++ 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; ++ stbi__pic_packet packets[10]; ++ ++ 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) ++// Does not support 16-bit-per-channel ++ ++#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); ++ ++ if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n)) ++ return 0; ++ ++ *x = s->img_x; ++ *y = s->img_y; ++ *comp = s->img_n; ++ ++ if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0)) ++ return stbi__errpuc("too large", "PNM too large"); ++ ++ out = (stbi_uc *)stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0); ++ if (!out) return stbi__errpuc("outofmem", "Out of memory"); ++ stbi__getn(s, out, s->img_n * s->img_x * s->img_y); ++ ++ if (req_comp && req_comp != s->img_n) { ++ 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); ++ } ++ ++ return value; ++} ++ ++static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) ++{ ++ int maxv; ++ char c, p, t; ++ ++ 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 ++ stbi__pnm_skip_whitespace(s, &c); ++ ++ *y = stbi__pnm_getinteger(s, &c); // read height ++ stbi__pnm_skip_whitespace(s, &c); ++ ++ maxv = stbi__pnm_getinteger(s, &c); // read max value ++ ++ if (maxv > 255) ++ return stbi__err("max value > 255", "PPM image not 8-bit"); ++ else ++ return 1; ++} ++#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"); ++} ++ ++#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; ++} ++#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); ++} ++ ++#endif // STB_IMAGE_IMPLEMENTATION ++ ++/* ++revision history: ++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 ++*/ +\ No newline at end of file +diff --git a/examples/include/stb_image_write.h b/examples/include/stb_image_write.h +new file mode 100644 +index 0000000..4319c0d +--- /dev/null ++++ b/examples/include/stb_image_write.h +@@ -0,0 +1,1048 @@ ++/* stb_image_write - v1.02 - public domain - http://nothings.org/stb/stb_image_write.h ++ writes out PNG/BMP/TGA 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. It could be ++ adapted to write to memory or a general streaming interface; let me know. ++ ++ The PNG output is not optimal; it is 20-50% larger than the file ++ written by a decent optimizing implementation. 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() ++ ++USAGE: ++ ++ There are four 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_hdr(char const *filename, int w, int h, int comp, const float *data); ++ ++ There are also four 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); ++ ++ where the callback is: ++ void stbi_write_func(void *context, void *data, int size); ++ ++ 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.) ++ ++ 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. ++ ++CREDITS: ++ ++ PNG/BMP/TGA ++ Sean Barrett ++ HDR ++ Baldur Karlsson ++ TGA monochrome: ++ Jean-Sebastien Guay ++ misc enhancements: ++ Tim Kelsey ++ TGA RLE ++ Alan Hickman ++ initial file IO callback implementation ++ Emmanuel Julien ++ bugfixes: ++ github:Chribba ++ Guillaume Chereau ++ github:jry2 ++ github:romigrou ++ Sergio Gonzalez ++ Jonas Karlsson ++ Filip Wasil ++ Thatcher Ulrich ++ ++LICENSE ++ ++This software is dual-licensed to the public domain and under the following ++license: you are granted a perpetual, irrevocable license to copy, modify, ++publish, and distribute this file as you see fit. ++ ++*/ ++ ++#ifndef INCLUDE_STB_IMAGE_WRITE_H ++#define INCLUDE_STB_IMAGE_WRITE_H ++ ++#ifdef __cplusplus ++extern "C" { ++#endif ++ ++#ifdef STB_IMAGE_WRITE_STATIC ++#define STBIWDEF static ++#else ++#define STBIWDEF extern ++extern int stbi_write_tga_with_rle; ++#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); ++#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); ++ ++#ifdef __cplusplus ++} ++#endif ++ ++#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 ++#endif // STBI_WRITE_NO_STDIO ++ ++#include ++#include ++#include ++#include ++ ++#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 ++#define STBIW_ASSERT(x) assert(x) ++#endif ++ ++#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) ++ ++typedef struct ++{ ++ stbi_write_func *func; ++ void *context; ++} 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); ++} ++ ++static int stbi__start_write_file(stbi__write_context *s, const char *filename) ++{ ++ FILE *f = 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]; ++ ++#ifdef STB_IMAGE_WRITE_STATIC ++static int stbi_write_tga_with_rle = 1; ++#else ++int stbi_write_tga_with_rle = 1; ++#endif ++ ++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__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) ++{ ++ unsigned char arr[3]; ++ arr[0] = a, arr[1] = b, arr[2] = c; ++ s->func(s->context, arr, 3); ++} ++ ++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) ++ s->func(s->context, &d[comp - 1], 1); ++ ++ switch (comp) { ++ case 1: ++ s->func(s->context,d,1); ++ break; ++ case 2: ++ if (expand_mono) ++ stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp ++ else ++ s->func(s->context, d, 1); // 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) ++ s->func(s->context, &d[comp - 1], 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 (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); ++ } ++ 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) ++{ ++ 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 ++} ++ ++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; ++ 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; ++ 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; ++ ++ 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); ++ ++ for (j = y - 1; j >= 0; --j) { ++ 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); ++ s->func(s->context, &header, 1); ++ 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); ++ s->func(s->context, &header, 1); ++ stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); ++ } ++ } ++ } ++ } ++ return 1; ++} ++ ++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; ++ stbi__start_write_callbacks(&s, func, context); ++ return stbi_write_tga_core(&s, x, y, comp, (void *) data); ++} ++ ++#ifndef STBI_WRITE_NO_STDIO ++int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) ++{ ++ stbi__write_context s; ++ 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 ++#ifndef STBI_WRITE_NO_STDIO ++ ++#define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) ++ ++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); ++ } ++} ++ ++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); ++} ++ ++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); ++} ++ ++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); ++ ++ len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); ++ s->func(s->context, buffer, len); ++ ++ for(i=0; i < y; i++) ++ stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*i*x); ++ STBIW_FREE(scratch); ++ return 1; ++ } ++} ++ ++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; ++ stbi__start_write_callbacks(&s, func, context); ++ return stbi_write_hdr_core(&s, x, y, comp, (float *) data); ++} ++ ++int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) ++{ ++ stbi__write_context s; ++ 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 ++// ++ ++// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() ++#define stbiw__sbraw(a) ((int *) (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 ++ ++unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) ++{ ++ 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(char**)); ++ 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); ++ ++ { ++ // 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); ++} ++ ++static unsigned int stbiw__crc32(unsigned char *buffer, int len) ++{ ++ 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; ++} ++ ++#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); ++} ++ ++unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) ++{ ++ 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 i,j,k,p,zlen; ++ ++ if (stride_bytes == 0) ++ stride_bytes = x * n; ++ ++ 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) { ++ static int mapping[] = { 0,1,2,3,4 }; ++ static int firstmap[] = { 0,1,0,5,6 }; ++ int *mymap = j ? mapping : firstmap; ++ int best = 0, bestval = 0x7fffffff; ++ for (p=0; p < 2; ++p) { ++ for (k= p?best:0; k < 5; ++k) { ++ int type = mymap[k],est=0; ++ unsigned char *z = pixels + stride_bytes*j; ++ for (i=0; i < n; ++i) ++ switch (type) { ++ case 0: line_buffer[i] = z[i]; break; ++ case 1: line_buffer[i] = z[i]; break; ++ case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break; ++ case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break; ++ case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break; ++ case 5: line_buffer[i] = z[i]; break; ++ case 6: line_buffer[i] = z[i]; break; ++ } ++ for (i=n; i < x*n; ++i) { ++ switch (type) { ++ case 0: line_buffer[i] = z[i]; break; ++ case 1: line_buffer[i] = z[i] - z[i-n]; break; ++ case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break; ++ case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break; ++ case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break; ++ case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break; ++ case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; ++ } ++ } ++ if (p) break; ++ for (i=0; i < x*n; ++i) ++ est += abs((signed char) line_buffer[i]); ++ if (est < bestval) { bestval = est; best = k; } ++ } ++ } ++ // when we get here, best contains the filter type, and line_buffer contains the data ++ filt[j*(x*n+1)] = (unsigned char) best; ++ 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, 8); // increase 8 to get smaller but use more memory ++ 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((unsigned char *) data, stride_bytes, x, y, comp, &len); ++ if (png == NULL) return 0; ++ f = 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((unsigned char *) data, stride_bytes, x, y, comp, &len); ++ if (png == NULL) return 0; ++ func(context, png, len); ++ STBIW_FREE(png); ++ return 1; ++} ++ ++#endif // STB_IMAGE_WRITE_IMPLEMENTATION ++ ++/* Revision history ++ 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 ++*/ +diff --git a/examples/magic_box.cpp b/examples/magic_box.cpp +new file mode 100644 +index 0000000..4c1e634 +--- /dev/null ++++ b/examples/magic_box.cpp +@@ -0,0 +1,228 @@ ++/* ++ * Copyright (c) 2020 Qualcomm Innovation Center, Inc. All Rights Reserved. ++ * ++ * SPDX-License-Identifier: BSD-3-Clause-Clear ++ */ ++ ++#define GLFW_INCLUDE_ES3 ++#include ++#include ++ ++#include ++#include ++#include ++ ++#include ++ ++#define STB_IMAGE_IMPLEMENTATION ++#include "stb_image.h" ++ ++static const char* vertex_shader_text = ++"#version 300 es\n" ++"layout (location = 0) in vec3 aPos;\n" ++"layout (location = 1) in vec2 aTexCoord;\n" ++"out vec2 TexCoord;\n" ++"uniform mat4 model;\n" ++"uniform mat4 view;\n" ++"uniform mat4 projection;\n" ++"void main()\n" ++"{\n" ++" gl_Position = projection * view * model * vec4(aPos, 1.0f);\n" ++" TexCoord = vec2(aTexCoord.x, aTexCoord.y);\n" ++"}\n"; ++ ++static const char* fragment_shader_text = ++"#version 300 es\n" ++"out vec4 FragColor;\n" ++"in vec2 TexCoord;\n" ++"uniform sampler2D texture;\n" ++"void main()\n" ++"{\n" ++" FragColor = vec4(texture(texture, TexCoord).rgb, 1.0);\n" ++"}\n"; ++ ++void framebuffer_size_callback(GLFWwindow* window, int width, int height); ++void processInput(GLFWwindow *window); ++ ++const unsigned int SCR_WIDTH = 800; ++const unsigned int SCR_HEIGHT = 600; ++int main() ++{ ++ // Init GLFW ++ if( !glfwInit()) ++ { ++ std::cout << "GLFW Init failed" << std::endl; ++ exit( EXIT_FAILURE ); ++ } ++ ++ glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); ++ glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2); ++ ++ // GLFW Create Window ++ GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "magic_box", NULL, NULL); ++ if (window == NULL) ++ { ++ std::cout << "GLFW create window failed" << std::endl; ++ exit( EXIT_FAILURE ); ++ } ++ glfwMakeContextCurrent(window); ++ glfwSetFramebufferSizeCallback(window, framebuffer_size_callback); ++ ++ glDisable(GL_DEPTH_TEST); ++ ++ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); ++ glClearColor(0.1f, 0.1f, 0.1f, 0.0f); ++ glEnable(GL_DEPTH_TEST); ++ ++ unsigned int vertex, fragment; ++ vertex = glCreateShader(GL_VERTEX_SHADER); ++ glShaderSource(vertex, 1, &vertex_shader_text, NULL); ++ glCompileShader(vertex); ++ fragment = glCreateShader(GL_FRAGMENT_SHADER); ++ glShaderSource(fragment, 1, &fragment_shader_text, NULL); ++ glCompileShader(fragment); ++ ++ unsigned int ID; ++ ID = glCreateProgram(); ++ glAttachShader(ID, vertex); ++ glAttachShader(ID, fragment); ++ glLinkProgram(ID); ++ ++ glDeleteShader(vertex); ++ glDeleteShader(fragment); ++ ++ float vertices[] = { ++ -0.6f, -0.6f, -0.6f, 0.0f, 0.0f, ++ 0.6f, -0.6f, -0.6f, 1.0f, 0.0f, ++ 0.6f, 0.6f, -0.6f, 1.0f, 1.0f, ++ 0.6f, 0.6f, -0.6f, 1.0f, 1.0f, ++ -0.6f, 0.6f, -0.6f, 0.0f, 1.0f, ++ -0.6f, -0.6f, -0.6f, 0.0f, 0.0f, ++ ++ -0.6f, -0.6f, 0.6f, 0.0f, 0.0f, ++ 0.6f, -0.6f, 0.6f, 1.0f, 0.0f, ++ 0.6f, 0.6f, 0.6f, 1.0f, 1.0f, ++ 0.6f, 0.6f, 0.6f, 1.0f, 1.0f, ++ -0.6f, 0.6f, 0.6f, 0.0f, 1.0f, ++ -0.6f, -0.6f, 0.6f, 0.0f, 0.0f, ++ ++ -0.6f, 0.6f, 0.6f, 1.0f, 0.0f, ++ -0.6f, 0.6f, -0.6f, 1.0f, 1.0f, ++ -0.6f, -0.6f, -0.6f, 0.0f, 1.0f, ++ -0.6f, -0.6f, -0.6f, 0.0f, 1.0f, ++ -0.6f, -0.6f, 0.6f, 0.0f, 0.0f, ++ -0.6f, 0.6f, 0.6f, 1.0f, 0.0f, ++ ++ 0.6f, 0.6f, 0.6f, 1.0f, 0.0f, ++ 0.6f, 0.6f, -0.6f, 1.0f, 1.0f, ++ 0.6f, -0.6f, -0.6f, 0.0f, 1.0f, ++ 0.6f, -0.6f, -0.6f, 0.0f, 1.0f, ++ 0.6f, -0.6f, 0.6f, 0.0f, 0.0f, ++ 0.6f, 0.6f, 0.6f, 1.0f, 0.0f, ++ ++ -0.6f, -0.6f, -0.6f, 0.0f, 1.0f, ++ 0.6f, -0.6f, -0.6f, 1.0f, 1.0f, ++ 0.6f, -0.6f, 0.6f, 1.0f, 0.0f, ++ 0.6f, -0.6f, 0.6f, 1.0f, 0.0f, ++ -0.6f, -0.6f, 0.6f, 0.0f, 0.0f, ++ -0.6f, -0.6f, -0.6f, 0.0f, 1.0f, ++ ++ -0.6f, 0.6f, -0.6f, 0.0f, 1.0f, ++ 0.6f, 0.6f, -0.6f, 1.0f, 1.0f, ++ 0.6f, 0.6f, 0.6f, 1.0f, 0.0f, ++ 0.6f, 0.6f, 0.6f, 1.0f, 0.0f, ++ -0.6f, 0.6f, 0.6f, 0.0f, 0.0f, ++ -0.6f, 0.6f, -0.6f, 0.0f, 1.0f ++ }; ++ unsigned int VBO, VAO; ++ glGenVertexArrays(1, &VAO); ++ glGenBuffers(1, &VBO); ++ ++ glBindVertexArray(VAO); ++ ++ glBindBuffer(GL_ARRAY_BUFFER, VBO); ++ glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); ++ ++ glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0); ++ glEnableVertexAttribArray(0); ++ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float))); ++ glEnableVertexAttribArray(1); ++ ++ unsigned int texture; ++ ++ glGenTextures(1, &texture); ++ glBindTexture(GL_TEXTURE_2D, texture); ++ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); ++ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); ++ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); ++ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); ++ ++ int width, height, nrChannels; ++ stbi_set_flip_vertically_on_load(true); ++ unsigned char *data = stbi_load("../examples/qualcomm.jpg", &width, &height, &nrChannels, 0); ++ if (data) ++ { ++ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data); ++ glGenerateMipmap(GL_TEXTURE_2D); ++ } ++ else ++ { ++ std::cout << "Load texture failed" << std::endl; ++ } ++ stbi_image_free(data); ++ ++ glUseProgram(ID); ++ ++ glUniform1i(texture, 0); ++ ++ while (!glfwWindowShouldClose(window)) ++ { ++ processInput(window); ++ ++ glClearColor(0.75f, 0.75f, 0.75f, 1.0f); ++ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); ++ ++ glActiveTexture(GL_TEXTURE0); ++ glBindTexture(GL_TEXTURE_2D, texture); ++ ++ glUseProgram(ID); ++ ++ glm::mat4 model = glm::mat4(1.0f); ++ glm::mat4 view = glm::mat4(1.0f); ++ glm::mat4 projection = glm::mat4(1.0f); ++ model = glm::rotate(model, (float)glfwGetTime(), glm::vec3(0.5f, 1.0f, 0.0f)); ++ view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f)); ++ projection = glm::perspective(glm::radians(50.0f), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f); ++ ++ unsigned int modelLoc = glGetUniformLocation(ID, "model"); ++ unsigned int viewLoc = glGetUniformLocation(ID, "view"); ++ unsigned int projectionLoc = glGetUniformLocation(ID, "projection"); ++ ++ glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model)); ++ glUniformMatrix4fv(viewLoc, 1, GL_FALSE, &view[0][0]); ++ glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, glm::value_ptr(projection)); ++ ++ glBindVertexArray(VAO); ++ glDrawArrays(GL_TRIANGLES, 0, 36); ++ ++ glfwSwapBuffers(window); ++ glfwPollEvents(); ++ } ++ ++ glDeleteVertexArrays(1, &VAO); ++ glDeleteBuffers(1, &VBO); ++ ++ glfwTerminate(); ++ return 0; ++} ++ ++void processInput(GLFWwindow *window) ++{ ++ if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) ++ glfwSetWindowShouldClose(window, true); ++} ++ ++void framebuffer_size_callback(GLFWwindow* window, int width, int height) ++{ ++ glViewport(0, 0, width, height); ++} +diff --git a/examples/offscreen.c b/examples/offscreen.c +new file mode 100644 +index 0000000..cf7178c +--- /dev/null ++++ b/examples/offscreen.c +@@ -0,0 +1,175 @@ ++//======================================================================== ++// Offscreen rendering example ++// Copyright (c) Camilla Löwy ++// ++// This software is provided 'as-is', without any express or implied ++// warranty. In no event will the authors be held liable for any damages ++// arising from the use of this software. ++// ++// Permission is granted to anyone to use this software for any purpose, ++// including commercial applications, and to alter it and redistribute it ++// freely, subject to the following restrictions: ++// ++// 1. The origin of this software must not be misrepresented; you must not ++// claim that you wrote the original software. If you use this software ++// in a product, an acknowledgment in the product documentation would ++// be appreciated but is not required. ++// ++// 2. Altered source versions must be plainly marked as such, and must not ++// be misrepresented as being the original software. ++// ++// 3. This notice may not be removed or altered from any source ++// distribution. ++// ++//======================================================================== ++ ++//#include ++#define GLFW_INCLUDE_ES3 ++#include ++ ++#if USE_NATIVE_OSMESA ++ #define GLFW_EXPOSE_NATIVE_OSMESA ++ #include ++#endif ++ ++#include "linmath.h" ++ ++#include ++#include ++ ++#define STB_IMAGE_WRITE_IMPLEMENTATION ++#include ++ ++static const struct ++{ ++ float x, y; ++ float r, g, b; ++} vertices[3] = ++{ ++ { -0.6f, -0.4f, 1.f, 0.f, 0.f }, ++ { 0.6f, -0.4f, 0.f, 1.f, 0.f }, ++ { 0.f, 0.6f, 0.f, 0.f, 1.f } ++}; ++ ++static const char* vertex_shader_text = ++"uniform mat4 MVP;\n" ++"attribute vec3 vCol;\n" ++"attribute vec2 vPos;\n" ++"varying vec3 color;\n" ++"void main()\n" ++"{\n" ++" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n" ++" color = vCol;\n" ++"}\n"; ++ ++static const char* fragment_shader_text = ++"varying vec3 color;\n" ++"void main()\n" ++"{\n" ++" gl_FragColor = vec4(color, 1.0);\n" ++"}\n"; ++ ++static void error_callback(int error, const char* description) ++{ ++ fprintf(stderr, "Error: %s\n", description); ++} ++ ++int main(void) ++{ ++ GLFWwindow* window; ++ GLuint vertex_buffer, vertex_shader, fragment_shader, program; ++ GLint mvp_location, vpos_location, vcol_location; ++ float ratio; ++ int width, height; ++ mat4x4 mvp; ++ char* buffer; ++ ++ glfwSetErrorCallback(error_callback); ++ ++// glfwInitHint(GLFW_COCOA_MENUBAR, GLFW_FALSE); ++ ++ if (!glfwInit()) ++ exit(EXIT_FAILURE); ++ ++ glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2); ++ glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0); ++ glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); ++ ++ window = glfwCreateWindow(640, 480, "Simple example", NULL, NULL); ++ if (!window) ++ { ++ glfwTerminate(); ++ exit(EXIT_FAILURE); ++ } ++ ++ glfwMakeContextCurrent(window); ++// gladLoadGL(glfwGetProcAddress); ++ ++ // NOTE: OpenGL error checks have been omitted for brevity ++ ++ glGenBuffers(1, &vertex_buffer); ++ glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); ++ glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); ++ ++ vertex_shader = glCreateShader(GL_VERTEX_SHADER); ++ glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL); ++ glCompileShader(vertex_shader); ++ ++ fragment_shader = glCreateShader(GL_FRAGMENT_SHADER); ++ glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL); ++ glCompileShader(fragment_shader); ++ ++ program = glCreateProgram(); ++ glAttachShader(program, vertex_shader); ++ glAttachShader(program, fragment_shader); ++ glLinkProgram(program); ++ ++ mvp_location = glGetUniformLocation(program, "MVP"); ++ vpos_location = glGetAttribLocation(program, "vPos"); ++ vcol_location = glGetAttribLocation(program, "vCol"); ++ ++ glEnableVertexAttribArray(vpos_location); ++ glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE, ++ sizeof(vertices[0]), (void*) 0); ++ glEnableVertexAttribArray(vcol_location); ++ glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE, ++ sizeof(vertices[0]), (void*) (sizeof(float) * 2)); ++ ++ glfwGetFramebufferSize(window, &width, &height); ++ ratio = width / (float) height; ++ ++ glViewport(0, 0, width, height); ++ glClear(GL_COLOR_BUFFER_BIT); ++ ++ mat4x4_ortho(mvp, -ratio, ratio, -1.f, 1.f, 1.f, -1.f); ++ ++ glUseProgram(program); ++ glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp); ++ glDrawArrays(GL_TRIANGLES, 0, 3); ++ glFinish(); ++ ++#if USE_NATIVE_OSMESA ++ glfwGetOSMesaColorBuffer(window, &width, &height, NULL, (void**) &buffer); ++#else ++ buffer = calloc(4, width * height); ++ glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, buffer); ++#endif ++ ++ // Write image Y-flipped because OpenGL ++ stbi_write_png("offscreen.png", ++ width, height, 4, ++ buffer + (width * 4 * (height - 1)), ++ -width * 4); ++ ++#if USE_NATIVE_OSMESA ++ // Here is where there's nothing ++#else ++ free(buffer); ++#endif ++ ++ glfwDestroyWindow(window); ++ ++ glfwTerminate(); ++ exit(EXIT_SUCCESS); ++} ++ +diff --git a/examples/sharing.c b/examples/sharing.c +new file mode 100644 +index 0000000..c77afff +--- /dev/null ++++ b/examples/sharing.c +@@ -0,0 +1,223 @@ ++//======================================================================== ++// Context sharing example ++// Copyright (c) Camilla Löwy ++// ++// This software is provided 'as-is', without any express or implied ++// warranty. In no event will the authors be held liable for any damages ++// arising from the use of this software. ++// ++// Permission is granted to anyone to use this software for any purpose, ++// including commercial applications, and to alter it and redistribute it ++// freely, subject to the following restrictions: ++// ++// 1. The origin of this software must not be misrepresented; you must not ++// claim that you wrote the original software. If you use this software ++// in a product, an acknowledgment in the product documentation would ++// be appreciated but is not required. ++// ++// 2. Altered source versions must be plainly marked as such, and must not ++// be misrepresented as being the original software. ++// ++// 3. This notice may not be removed or altered from any source ++// distribution. ++// ++//======================================================================== ++ ++#include ++ ++#include ++#include ++ ++#include "getopt.h" ++#include "linmath.h" ++ ++static const char* vertex_shader_text = ++"uniform mat4 MVP;\n" ++"attribute vec2 vPos;\n" ++"varying vec2 texcoord;\n" ++"void main()\n" ++"{\n" ++" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n" ++" texcoord = vPos;\n" ++"}\n"; ++ ++static const char* fragment_shader_text = ++"uniform sampler2D texture;\n" ++"uniform vec3 color;\n" ++"varying vec2 texcoord;\n" ++"void main()\n" ++"{\n" ++" gl_FragColor = vec4(color * texture2D(texture, texcoord).rgb, 1.0);\n" ++"}\n"; ++ ++static const vec2 vertices[4] = ++{ ++ { 0.f, 0.f }, ++ { 1.f, 0.f }, ++ { 1.f, 1.f }, ++ { 0.f, 1.f } ++}; ++ ++static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) ++{ ++ if (action == GLFW_PRESS && key == GLFW_KEY_ESCAPE) ++ glfwSetWindowShouldClose(window, GLFW_TRUE); ++} ++ ++int main(int argc, char** argv) ++{ ++ GLFWwindow* windows[2]; ++ GLuint texture, program, vertex_buffer; ++ GLint mvp_location, vpos_location, color_location, texture_location; ++ ++ if (!glfwInit()) ++ exit(EXIT_FAILURE); ++ ++ glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2); ++ glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0); ++ ++ windows[0] = glfwCreateWindow(400, 400, "First", NULL, NULL); ++ if (!windows[0]) ++ { ++ glfwTerminate(); ++ exit(EXIT_FAILURE); ++ } ++ ++ glfwSetKeyCallback(windows[0], key_callback); ++ ++ glfwMakeContextCurrent(windows[0]); ++ ++ // Only enable vsync for the first of the windows to be swapped to ++ // avoid waiting out the interval for each window ++ glfwSwapInterval(1); ++ ++ // The contexts are created with the same APIs so the function ++ // pointers should be re-usable between them ++// gladLoadGL(glfwGetProcAddress); ++ ++ // Create the OpenGL objects inside the first context, created above ++ // All objects will be shared with the second context, created below ++ { ++ int x, y; ++ char pixels[16 * 16]; ++ GLuint vertex_shader, fragment_shader; ++ ++ glGenTextures(1, &texture); ++ glBindTexture(GL_TEXTURE_2D, texture); ++ ++ srand((unsigned int) glfwGetTimerValue()); ++ ++ for (y = 0; y < 16; y++) ++ { ++ for (x = 0; x < 16; x++) ++ pixels[y * 16 + x] = rand() % 256; ++ } ++ ++ glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 16, 16, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, pixels); ++ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); ++ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); ++ ++ vertex_shader = glCreateShader(GL_VERTEX_SHADER); ++ glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL); ++ glCompileShader(vertex_shader); ++ ++ fragment_shader = glCreateShader(GL_FRAGMENT_SHADER); ++ glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL); ++ glCompileShader(fragment_shader); ++ ++ program = glCreateProgram(); ++ glAttachShader(program, vertex_shader); ++ glAttachShader(program, fragment_shader); ++ glLinkProgram(program); ++ ++ mvp_location = glGetUniformLocation(program, "MVP"); ++ color_location = glGetUniformLocation(program, "color"); ++ texture_location = glGetUniformLocation(program, "texture"); ++ vpos_location = glGetAttribLocation(program, "vPos"); ++ ++ glGenBuffers(1, &vertex_buffer); ++ glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); ++ glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); ++ } ++ ++ glUseProgram(program); ++ glUniform1i(texture_location, 0); ++ ++ glEnable(GL_TEXTURE_2D); ++ glBindTexture(GL_TEXTURE_2D, texture); ++ ++ glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); ++ glEnableVertexAttribArray(vpos_location); ++ glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE, ++ sizeof(vertices[0]), (void*) 0); ++ ++ windows[1] = glfwCreateWindow(400, 400, "Second", NULL, windows[0]); ++ if (!windows[1]) ++ { ++ glfwTerminate(); ++ exit(EXIT_FAILURE); ++ } ++ ++ // Place the second window to the right of the first ++ { ++ int xpos, ypos, left, right, width; ++ ++ glfwGetWindowSize(windows[0], &width, NULL); ++ glfwGetWindowFrameSize(windows[0], &left, NULL, &right, NULL); ++ glfwGetWindowPos(windows[0], &xpos, &ypos); ++ ++ glfwSetWindowPos(windows[1], xpos + width + left + right, ypos); ++ } ++ ++ glfwSetKeyCallback(windows[1], key_callback); ++ ++ glfwMakeContextCurrent(windows[1]); ++ ++ // While objects are shared, the global context state is not and will ++ // need to be set up for each context ++ ++ glUseProgram(program); ++ ++ glEnable(GL_TEXTURE_2D); ++ glBindTexture(GL_TEXTURE_2D, texture); ++ ++ glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); ++ glEnableVertexAttribArray(vpos_location); ++ glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE, ++ sizeof(vertices[0]), (void*) 0); ++ ++ while (!glfwWindowShouldClose(windows[0]) && ++ !glfwWindowShouldClose(windows[1])) ++ { ++ int i; ++ const vec3 colors[2] = ++ { ++ { 0.8f, 0.4f, 1.f }, ++ { 0.3f, 0.4f, 1.f } ++ }; ++ ++ for (i = 0; i < 2; i++) ++ { ++ int width, height; ++ mat4x4 mvp; ++ ++ glfwGetFramebufferSize(windows[i], &width, &height); ++ glfwMakeContextCurrent(windows[i]); ++ ++ glViewport(0, 0, width, height); ++ ++ mat4x4_ortho(mvp, 0.f, 1.f, 0.f, 1.f, 0.f, 1.f); ++ glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp); ++ glUniform3fv(color_location, 1, colors[i]); ++ glDrawArrays(GL_TRIANGLE_FAN, 0, 4); ++ ++ glfwSwapBuffers(windows[i]); ++ } ++ ++ glfwWaitEvents(); ++ } ++ ++ glfwTerminate(); ++ exit(EXIT_SUCCESS); ++} ++ +-- +2.26.2 + diff --git a/OpenGLES-Application/0001-Modify-opengles-demo.patch b/OpenGLES-Application/0001-Modify-opengles-demo.patch new file mode 100644 index 0000000..04fc2ec --- /dev/null +++ b/OpenGLES-Application/0001-Modify-opengles-demo.patch @@ -0,0 +1,146 @@ +From 2d1e25f321a6f844389b4d9f68e7803342706aec Mon Sep 17 00:00:00 2001 +From: Wanghao Wei +Date: Fri, 29 Jan 2021 12:20:29 +0800 +Subject: [PATCH] Modify opengles demo + +--- + examples/CMakeLists.txt | 42 ++++++++++++----------------------------- + examples/heightmap.c | 11 ++--------- + examples/simple.c | 7 ------- + 3 files changed, 14 insertions(+), 46 deletions(-) + +diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt +index 138a781..4f8cc8b 100644 +--- a/examples/CMakeLists.txt ++++ b/examples/CMakeLists.txt +@@ -12,6 +12,7 @@ if (MSVC) + endif() + + include_directories("${GLFW_SOURCE_DIR}/deps") ++include_directories("${GLFW_SOURCE_DIR}/examples/include") + + if (WIN32) + set(ICON glfw.rc) +@@ -28,40 +29,21 @@ set(GETOPT "${GLFW_SOURCE_DIR}/deps/getopt.h" + set(TINYCTHREAD "${GLFW_SOURCE_DIR}/deps/tinycthread.h" + "${GLFW_SOURCE_DIR}/deps/tinycthread.c") + +-add_executable(boing WIN32 MACOSX_BUNDLE boing.c ${ICON} ${GLAD}) +-add_executable(gears WIN32 MACOSX_BUNDLE gears.c ${ICON} ${GLAD}) + add_executable(heightmap WIN32 MACOSX_BUNDLE heightmap.c ${ICON} ${GLAD}) +-add_executable(particles WIN32 MACOSX_BUNDLE particles.c ${ICON} ${TINYCTHREAD} ${GETOPT} ${GLAD}) + add_executable(simple WIN32 MACOSX_BUNDLE simple.c ${ICON} ${GLAD}) +-add_executable(splitview WIN32 MACOSX_BUNDLE splitview.c ${ICON} ${GLAD}) +-add_executable(wave WIN32 MACOSX_BUNDLE wave.c ${ICON} ${GLAD}) ++add_executable(sharing WIN32 MACOSX_BUNDLE sharing.c ${ICON}) ++add_executable(offscreen offscreen.c ${ICON}) + +-target_link_libraries(particles "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}") ++add_executable(magic_box magic_box.cpp ${ICON}) + +-set(WINDOWS_BINARIES boing gears heightmap particles simple splitview wave) ++target_link_libraries(heightmap "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}" -lGLESv2 -lGLESv1_CM) ++target_link_libraries(simple "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}" -lGLESv2 -lGLESv1_CM) ++target_link_libraries(sharing "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}" -lGLESv2 -lGLESv1_CM) ++target_link_libraries(offscreen "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}" -lGLESv2 -lGLESv1_CM) + +-set_target_properties(${WINDOWS_BINARIES} PROPERTIES FOLDER "GLFW3/Examples") +- +-if (MSVC) +- # Tell MSVC to use main instead of WinMain for Windows subsystem executables +- set_target_properties(${WINDOWS_BINARIES} PROPERTIES +- LINK_FLAGS "/ENTRY:mainCRTStartup") +-endif() ++target_link_libraries(magic_box "${CMAKE_THREAD_LIBS_INIT}" "${RT_LIBRARY}" -lGLESv2 -lGLESv1_CM) + +-if (APPLE) +- set_target_properties(boing PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Boing") +- set_target_properties(gears PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Gears") +- set_target_properties(heightmap PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Heightmap") +- set_target_properties(particles PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Particles") +- set_target_properties(simple PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Simple") +- set_target_properties(splitview PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "SplitView") +- set_target_properties(wave PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Wave") +- +- set_target_properties(${WINDOWS_BINARIES} PROPERTIES +- RESOURCE glfw.icns +- MACOSX_BUNDLE_SHORT_VERSION_STRING ${GLFW_VERSION} +- MACOSX_BUNDLE_LONG_VERSION_STRING ${GLFW_VERSION_FULL} +- MACOSX_BUNDLE_ICON_FILE glfw.icns +- MACOSX_BUNDLE_INFO_PLIST "${GLFW_SOURCE_DIR}/CMake/MacOSXBundleInfo.plist.in") +-endif() ++set(WINDOWS_BINARIES heightmap simple sharing magic_box) ++set(CONSOLE_BINARIES offscreen) + ++set_target_properties(${WINDOWS_BINARIES} PROPERTIES FOLDER "GLFW3/Examples") +diff --git a/examples/heightmap.c b/examples/heightmap.c +index b57815e..a3cb5c0 100644 +--- a/examples/heightmap.c ++++ b/examples/heightmap.c +@@ -52,7 +52,7 @@ + *********************************************************************/ + + static const char* vertex_shader_text = +-"#version 150\n" ++"#version 300 es\n" + "uniform mat4 project;\n" + "uniform mat4 modelview;\n" + "in float x;\n" +@@ -65,7 +65,7 @@ static const char* vertex_shader_text = + "}\n"; + + static const char* fragment_shader_text = +-"#version 150\n" ++"#version 300 es\n" + "out vec4 color;\n" + "void main()\n" + "{\n" +@@ -391,11 +391,6 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action, + } + } + +-static void error_callback(int error, const char* description) +-{ +- fprintf(stderr, "Error: %s\n", description); +-} +- + int main(int argc, char** argv) + { + GLFWwindow* window; +@@ -410,8 +405,6 @@ int main(int argc, char** argv) + + GLuint shader_program; + +- glfwSetErrorCallback(error_callback); +- + if (!glfwInit()) + exit(EXIT_FAILURE); + +diff --git a/examples/simple.c b/examples/simple.c +index 43d11fa..6254b33 100644 +--- a/examples/simple.c ++++ b/examples/simple.c +@@ -61,11 +61,6 @@ static const char* fragment_shader_text = + " gl_FragColor = vec4(color, 1.0);\n" + "}\n"; + +-static void error_callback(int error, const char* description) +-{ +- fprintf(stderr, "Error: %s\n", description); +-} +- + static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) + { + if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) +@@ -78,8 +73,6 @@ int main(void) + GLuint vertex_buffer, vertex_shader, fragment_shader, program; + GLint mvp_location, vpos_location, vcol_location; + +- glfwSetErrorCallback(error_callback); +- + if (!glfwInit()) + exit(EXIT_FAILURE); + +-- +2.26.2 + diff --git a/OpenGLES-Application/LICENSE b/OpenGLES-Application/LICENSE new file mode 100644 index 0000000..753f441 --- /dev/null +++ b/OpenGLES-Application/LICENSE @@ -0,0 +1,28 @@ +Copyright (c) 2020 Qualcomm Innovation Center, Inc. All Rights Reserved. + +Redistribution and use in source and binary forms, with or without modification, are permitted +provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright notice, this list of conditions + and the following disclaimer. +* Redistributions in binary form must reproduce the above copyright notice, this list of + conditions and the following disclaimer in the documentation and/or other materials + provided with the distribution. +* Neither the name of the copyright holder nor the names of its contributors may be used to + endorse or promote products derived from this software without specific prior written + permission. + +NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS +LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR +ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS +OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN +IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Where there is uncertainty as to how, or +where, to apply marks, open an OSR to escalate to OSG for review. + +SPDX-License-Identifier: BSD-3-Clause-Clear diff --git a/OpenGLES-Application/README.md b/OpenGLES-Application/README.md new file mode 100644 index 0000000..f81e28c --- /dev/null +++ b/OpenGLES-Application/README.md @@ -0,0 +1,50 @@ +# OpenGL ES Examples +# Overview +Each demo manages the window through the glfw frame. Using the API provided by OpenGLES and can be run and displayed in the Weston window. + +## 1. Init +### 1.1 Set opengles environment +``` +$ adb shell +$ apt-get install extra-cmake-modules wayland-protocols libsdl2-dev libglm-dev +``` +### 1.2 Download source code +``` +$ cd /data +$ git clone https://github.com/quic/sample-apps-for-Qualcomm-Robotics-RB5-platform.git +$ cd OpenGLES-Application/ +$ cp weston.sh /data +$ git clone https://github.com/dhustkoder/glfw.git +$ cp qualcomm.jpg glfw/examples/ +$ cp 0001-Adapter-Opengles-API.patch 0001-Modify-opengles-demo.patch 0001-Add-opengles-demo.patch glfw/ +$ cd glfw/ +$ git apply 0001-Adapter-Opengles-API.patch +$ git apply 0001-Modify-opengles-demo.patch +$ git apply 0001-Add-opengles-demo.patch +``` +## 2. Build +``` +$ mkdir build/ +$ cd build/ +$ cmake -DGLFW_USE_WAYLAND=ON .. +$ make -j8 +``` +## 3. Run +### 3.1 Execute weston script, run weston: +``` +$ cd /data +$ sh weston.sh +``` +### 3.2 Run demo +``` +$ cd /data/OpenGLES-Application/glfw/build +// The offscreen demo Will not be displayed directly, but input the drawn triangle into offscreen.png +$ ./examples/offscreen +$ ./examples/sharing +$ ./examples/simple +$ ./examples/heightmap +$ ./examples/magic_box +``` +// Note: Currently this app only supports offscreen, sharing, simple, heightmap, magic_box. +## License +This is licensed under the BSD 3-clause-Clear “New” or “Revised” License. Check out the [LICENSE](LICENSE) for more details. diff --git a/OpenGLES-Application/qualcomm.jpg b/OpenGLES-Application/qualcomm.jpg new file mode 100644 index 0000000..6339ecb Binary files /dev/null and b/OpenGLES-Application/qualcomm.jpg differ diff --git a/OpenGLES-Application/weston.sh b/OpenGLES-Application/weston.sh new file mode 100644 index 0000000..7bab8fb --- /dev/null +++ b/OpenGLES-Application/weston.sh @@ -0,0 +1,9 @@ +# Copyright (c) 2020 Qualcomm Innovation Center, Inc. All Rights Reserved. +# +# SPDX-License-Identifier: BSD-3-Clause-Clear + +#! /bin/bash +mkdir -p /usr/bin/weston_socket +export XDG_RUNTIME_DIR=/usr/bin/weston_socket +export LD_LIBRARY_PATH=/usr/lib:/usr/lib/aarch64-linux-gnu/ +weston --tty=1 --connector=29 \ No newline at end of file