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uint32_t col = 0xFF000000 | r << 16 | g << 8 | b; + uint32_t col = r << 24 | g << 16 | b << 8 | 0xFF; Data[i] = col; } diff --git a/src/main.cpp b/src/main.cpp index 890625b..2be6dfc 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -21,14 +21,13 @@ struct Game SDL_GLContext GlContext = nullptr; }; -void GLAPIENTRY -MessageCallback( GLenum source, - GLenum type, - GLuint id, - GLenum severity, - GLsizei length, - const GLchar* message, - const void* userParam ) +void GLAPIENTRY MessageCallback( GLenum source, + GLenum type, + GLuint id, + GLenum severity, + GLsizei length, + const GLchar* message, + const void* userParam ) { std::cout << "GL CALLBACK: type = " << type << ", severity = " << severity @@ -74,8 +73,9 @@ int main() // Time to actually load OpenGL gladLoadGLLoader( SDL_GL_GetProcAddress ); - glEnable( GL_DEBUG_OUTPUT ); - glDebugMessageCallback( MessageCallback, 0 ); + // Doesnt work + //glEnable( GL_DEBUG_OUTPUT ); + //glDebugMessageCallback( MessageCallback, 0 ); Renderer renderer; renderer.LoadShader(); @@ -86,6 +86,16 @@ int main() framebuffer.SetPixel( 3, 1, { 1.0, 0.0, 0.0 } ); framebuffer.SetPixel( 4, 1, { 1.0, 0.0, 0.0 } ); framebuffer.SetPixel( 5, 1, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 1, 2, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 2, 2, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 3, 2, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 4, 2, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 5, 3, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 1, 3, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 2, 3, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 3, 3, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 4, 3, { 1.0, 0.0, 0.0 } ); + framebuffer.SetPixel( 5, 3, { 1.0, 0.0, 0.0 } ); renderer.RegisterBuffer( &framebuffer, 0 ); diff --git a/src/renderer.cpp b/src/renderer.cpp index 1dd2a2a..2fde98e 100644 --- a/src/renderer.cpp +++ b/src/renderer.cpp @@ -105,15 +105,16 @@ int8_t Renderer::RegisterBuffer( FrameBuffer* buffer, int layer ) // Load buffer as a texture into OpenGL GLuint 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 ); - glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, buffer->GetWidth(), buffer->GetHeight(), 0, GL_RGB, GL_RGBA32UI, buffer->Data ); + // Colour stored as uint32_t so 0xRRGGBBAA except no A + glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, buffer->GetWidth(), buffer->GetHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer->Data ); - FrameBufferRenderable fb = { buffer, @@ -160,7 +161,7 @@ void Renderer::UpdateBuffer( int8_t id ) return; FrameBuffer* buffer = mRenderQueue[id].Buffer; - glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, buffer->GetWidth(), buffer->GetHeight(), 0, GL_RGB, GL_UNSIGNED_BYTE, buffer->Data ); + glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, buffer->GetWidth(), buffer->GetHeight(), 0, GL_RGBA, GL_RGBA32UI, buffer->Data ); } void Renderer::Render() @@ -171,8 +172,8 @@ void Renderer::Render() for ( size_t i = 0; i < mRenderQueue.size(); i++ ) { FrameBufferRenderable* fb = &mRenderQueue[i]; - glBindTexture( GL_TEXTURE_2D, fb->TextureID ); glBindVertexArray( fb->VAO ); + glBindTexture( GL_TEXTURE_2D, fb->TextureID ); glDrawElements( GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0 ); } } diff --git a/src/thirdparty/stb_image.h b/src/thirdparty/stb_image.h new file mode 100644 index 0000000..d4194d1 --- /dev/null +++ b/src/thirdparty/stb_image.h @@ -0,0 +1,7666 @@ +/* stb_image - v2.23 - public domain image loader - http://nothings.org/stb + no warranty implied; use at your own risk + + Do this: + #define STB_IMAGE_IMPLEMENTATION + before you include this file in *one* C or C++ file to create the implementation. + + // i.e. it should look like this: + #include ... + #include ... + #include ... + #define STB_IMAGE_IMPLEMENTATION + #include "stb_image.h" + + You can #define STBI_ASSERT(x) before the #include to avoid using assert.h. + And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free + + + QUICK NOTES: + Primarily of interest to game developers and other people who can + avoid problematic images and only need the trivial interface + + JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) + PNG 1/2/4/8/16-bit-per-channel + + TGA (not sure what subset, if a subset) + BMP non-1bpp, non-RLE + PSD (composited view only, no extra channels, 8/16 bit-per-channel) + + GIF (*comp always reports as 4-channel) + HDR (radiance rgbE format) + PIC (Softimage PIC) + PNM (PPM and PGM binary only) + + Animated GIF still needs a proper API, but here's one way to do it: + http://gist.github.com/urraka/685d9a6340b26b830d49 + + - decode from memory or through FILE (define STBI_NO_STDIO to remove code) + - decode from arbitrary I/O callbacks + - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON) + + Full documentation under "DOCUMENTATION" below. + + +LICENSE + + See end of file for license information. + +RECENT REVISION HISTORY: + + 2.23 (2019-08-11) fix clang static analysis warning + 2.22 (2019-03-04) gif fixes, fix warnings + 2.21 (2019-02-25) fix typo in comment + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs + 2.19 (2018-02-11) fix warning + 2.18 (2018-01-30) fix warnings + 2.17 (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings + 2.16 (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes + 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs + 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 + RGB-format JPEG; remove white matting in PSD; + allocate large structures on the stack; + correct channel count for PNG & BMP + 2.10 (2016-01-22) avoid warning introduced in 2.09 + 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED + + See end of file for full revision history. + + + ============================ Contributors ========================= + + Image formats Extensions, features + Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info) + Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info) + Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) + Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) + Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) + Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) + Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) + github:urraka (animated gif) Junggon Kim (PNM comments) + Christopher Forseth (animated gif) Daniel Gibson (16-bit TGA) + socks-the-fox (16-bit PNG) + Jeremy Sawicki (handle all ImageNet JPGs) + Optimizations & bugfixes Mikhail Morozov (1-bit BMP) + Fabian "ryg" Giesen Anael Seghezzi (is-16-bit query) + Arseny Kapoulkine + John-Mark Allen + Carmelo J Fdez-Aguera + + Bug & warning fixes + Marc LeBlanc David Woo Guillaume George Martins Mozeiko + Christpher Lloyd Jerry Jansson Joseph Thomson Phil Jordan + Dave Moore Roy Eltham Hayaki Saito Nathan Reed + Won Chun Luke Graham Johan Duparc Nick Verigakis + the Horde3D community Thomas Ruf Ronny Chevalier github:rlyeh + Janez Zemva John Bartholomew Michal Cichon github:romigrou + Jonathan Blow Ken Hamada Tero Hanninen github:svdijk + Laurent Gomila Cort Stratton Sergio Gonzalez github:snagar + Aruelien Pocheville Thibault Reuille Cass Everitt github:Zelex + Ryamond Barbiero Paul Du Bois Engin Manap github:grim210 + Aldo Culquicondor Philipp Wiesemann Dale Weiler github:sammyhw + Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:phprus + Julian Raschke Gregory Mullen Baldur Karlsson github:poppolopoppo + Christian Floisand Kevin Schmidt JR Smith github:darealshinji + Blazej Dariusz Roszkowski github:Michaelangel007 +*/ + +#ifndef STBI_INCLUDE_STB_IMAGE_H +#define STBI_INCLUDE_STB_IMAGE_H + +// DOCUMENTATION +// +// Limitations: +// - no 12-bit-per-channel JPEG +// - no JPEGs with arithmetic coding +// - GIF always returns *comp=4 +// +// Basic usage (see HDR discussion below for HDR usage): +// int x,y,n; +// unsigned char *data = stbi_load(filename, &x, &y, &n, 0); +// // ... process data if not NULL ... +// // ... x = width, y = height, n = # 8-bit components per pixel ... +// // ... replace '0' with '1'..'4' to force that many components per pixel +// // ... but 'n' will always be the number that it would have been if you said 0 +// stbi_image_free(data) +// +// Standard parameters: +// int *x -- outputs image width in pixels +// int *y -- outputs image height in pixels +// int *channels_in_file -- outputs # of image components in image file +// int desired_channels -- if non-zero, # of image components requested in result +// +// The return value from an image loader is an 'unsigned char *' which points +// to the pixel data, or NULL on an allocation failure or if the image is +// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, +// with each pixel consisting of N interleaved 8-bit components; the first +// pixel pointed to is top-left-most in the image. There is no padding between +// image scanlines or between pixels, regardless of format. The number of +// components N is 'desired_channels' if desired_channels is non-zero, or +// *channels_in_file otherwise. If desired_channels is non-zero, +// *channels_in_file has the number of components that _would_ have been +// output otherwise. E.g. if you set desired_channels to 4, you will always +// get RGBA output, but you can check *channels_in_file to see if it's trivially +// opaque because e.g. there were only 3 channels in the source image. +// +// An output image with N components has the following components interleaved +// in this order in each pixel: +// +// N=#comp components +// 1 grey +// 2 grey, alpha +// 3 red, green, blue +// 4 red, green, blue, alpha +// +// If image loading fails for any reason, the return value will be NULL, +// and *x, *y, *channels_in_file will be unchanged. The function +// stbi_failure_reason() can be queried for an extremely brief, end-user +// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS +// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly +// more user-friendly ones. +// +// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. +// +// =========================================================================== +// +// UNICODE: +// +// If compiling for Windows and you wish to use Unicode filenames, compile +// with +// #define STBI_WINDOWS_UTF8 +// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert +// Windows wchar_t filenames to utf8. +// +// =========================================================================== +// +// Philosophy +// +// stb libraries are designed with the following priorities: +// +// 1. easy to use +// 2. easy to maintain +// 3. good performance +// +// Sometimes I let "good performance" creep up in priority over "easy to maintain", +// and for best performance I may provide less-easy-to-use APIs that give higher +// performance, in addition to the easy-to-use ones. Nevertheless, it's important +// to keep in mind that from the standpoint of you, a client of this library, +// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all. +// +// Some secondary priorities arise directly from the first two, some of which +// provide more explicit reasons why performance can't be emphasized. +// +// - Portable ("ease of use") +// - Small source code footprint ("easy to maintain") +// - No dependencies ("ease of use") +// +// =========================================================================== +// +// I/O callbacks +// +// I/O callbacks allow you to read from arbitrary sources, like packaged +// files or some other source. Data read from callbacks are processed +// through a small internal buffer (currently 128 bytes) to try to reduce +// overhead. +// +// The three functions you must define are "read" (reads some bytes of data), +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). +// +// =========================================================================== +// +// SIMD support +// +// The JPEG decoder will try to automatically use SIMD kernels on x86 when +// supported by the compiler. For ARM Neon support, you must explicitly +// request it. +// +// (The old do-it-yourself SIMD API is no longer supported in the current +// code.) +// +// On x86, SSE2 will automatically be used when available based on a run-time +// test; if not, the generic C versions are used as a fall-back. On ARM targets, +// the typical path is to have separate builds for NEON and non-NEON devices +// (at least this is true for iOS and Android). Therefore, the NEON support is +// toggled by a build flag: define STBI_NEON to get NEON loops. +// +// If for some reason you do not want to use any of SIMD code, or if +// you have issues compiling it, you can disable it entirely by +// defining STBI_NO_SIMD. +// +// =========================================================================== +// +// HDR image support (disable by defining STBI_NO_HDR) +// +// stb_image supports loading HDR images in general, and currently the Radiance +// .HDR file format specifically. You can still load any file through the existing +// interface; if you attempt to load an HDR file, it will be automatically remapped +// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; +// both of these constants can be reconfigured through this interface: +// +// stbi_hdr_to_ldr_gamma(2.2f); +// stbi_hdr_to_ldr_scale(1.0f); +// +// (note, do not use _inverse_ constants; stbi_image will invert them +// appropriately). +// +// Additionally, there is a new, parallel interface for loading files as +// (linear) floats to preserve the full dynamic range: +// +// float *data = stbi_loadf(filename, &x, &y, &n, 0); +// +// If you load LDR images through this interface, those images will +// be promoted to floating point values, run through the inverse of +// constants corresponding to the above: +// +// stbi_ldr_to_hdr_scale(1.0f); +// stbi_ldr_to_hdr_gamma(2.2f); +// +// Finally, given a filename (or an open file or memory block--see header +// file for details) containing image data, you can query for the "most +// appropriate" interface to use (that is, whether the image is HDR or +// not), using: +// +// stbi_is_hdr(char *filename); +// +// =========================================================================== +// +// iPhone PNG support: +// +// By default we convert iphone-formatted PNGs back to RGB, even though +// they are internally encoded differently. You can disable this conversion +// 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). +// +// =========================================================================== +// +// ADDITIONAL CONFIGURATION +// +// - You can suppress implementation of any of the decoders to reduce +// your code footprint by #defining one or more of the following +// symbols before creating the implementation. +// +// STBI_NO_JPEG +// STBI_NO_PNG +// STBI_NO_BMP +// STBI_NO_PSD +// STBI_NO_TGA +// STBI_NO_GIF +// STBI_NO_HDR +// STBI_NO_PIC +// STBI_NO_PNM (.ppm and .pgm) +// +// - You can request *only* certain decoders and suppress all other ones +// (this will be more forward-compatible, as addition of new decoders +// doesn't require you to disable them explicitly): +// +// STBI_ONLY_JPEG +// STBI_ONLY_PNG +// STBI_ONLY_BMP +// STBI_ONLY_PSD +// STBI_ONLY_TGA +// STBI_ONLY_GIF +// STBI_ONLY_HDR +// STBI_ONLY_PIC +// STBI_ONLY_PNM (.ppm and .pgm) +// +// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still +// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB +// + + +#ifndef STBI_NO_STDIO +#include +#endif // STBI_NO_STDIO + +#define STBI_VERSION 1 + +enum +{ + STBI_default = 0, // only used for desired_channels + + STBI_grey = 1, + STBI_grey_alpha = 2, + STBI_rgb = 3, + STBI_rgb_alpha = 4 +}; + +#include +typedef unsigned char stbi_uc; +typedef unsigned short stbi_us; + +#ifdef __cplusplus +extern "C" { +#endif + +#ifndef STBIDEF +#ifdef STB_IMAGE_STATIC +#define STBIDEF static +#else +#define STBIDEF extern +#endif +#endif + + ////////////////////////////////////////////////////////////////////////////// + // + // PRIMARY API - works on images of any type + // + + // + // load image by filename, open file, or memory buffer + // + + typedef struct + { + int ( *read ) ( void* user, char* data, int size ); // fill 'data' with 'size' bytes. return number of bytes actually read + void ( *skip ) ( void* user, int n ); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative + int ( *eof ) ( void* user ); // returns nonzero if we are at end of file/data + } stbi_io_callbacks; + + //////////////////////////////////// + // + // 8-bits-per-channel interface + // + + STBIDEF stbi_uc* stbi_load_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels ); + STBIDEF stbi_uc* stbi_load_from_callbacks( stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels ); + +#ifndef STBI_NO_STDIO + STBIDEF stbi_uc* stbi_load( char const* filename, int* x, int* y, int* channels_in_file, int desired_channels ); + STBIDEF stbi_uc* stbi_load_from_file( FILE* f, int* x, int* y, int* channels_in_file, int desired_channels ); + // for stbi_load_from_file, file pointer is left pointing immediately after image +#endif + +#ifndef STBI_NO_GIF + STBIDEF stbi_uc* stbi_load_gif_from_memory( stbi_uc const* buffer, int len, int** delays, int* x, int* y, int* z, int* comp, int req_comp ); +#endif + +#ifdef STBI_WINDOWS_UTF8 + STBIDEF int stbi_convert_wchar_to_utf8( char* buffer, size_t bufferlen, const wchar_t* input ); +#endif + + //////////////////////////////////// + // + // 16-bits-per-channel interface + // + + STBIDEF stbi_us* stbi_load_16_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels ); + STBIDEF stbi_us* stbi_load_16_from_callbacks( stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels ); + +#ifndef STBI_NO_STDIO + STBIDEF stbi_us* stbi_load_16( char const* filename, int* x, int* y, int* channels_in_file, int desired_channels ); + STBIDEF stbi_us* stbi_load_from_file_16( FILE* f, int* x, int* y, int* channels_in_file, int desired_channels ); +#endif + + //////////////////////////////////// + // + // float-per-channel interface + // +#ifndef STBI_NO_LINEAR + STBIDEF float* stbi_loadf_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels ); + STBIDEF float* stbi_loadf_from_callbacks( stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels ); + +#ifndef STBI_NO_STDIO + STBIDEF float* stbi_loadf( char const* filename, int* x, int* y, int* channels_in_file, int desired_channels ); + STBIDEF float* stbi_loadf_from_file( FILE* f, int* x, int* y, int* channels_in_file, int desired_channels ); +#endif +#endif + +#ifndef STBI_NO_HDR + STBIDEF void stbi_hdr_to_ldr_gamma( float gamma ); + STBIDEF void stbi_hdr_to_ldr_scale( float scale ); +#endif // STBI_NO_HDR + +#ifndef STBI_NO_LINEAR + STBIDEF void stbi_ldr_to_hdr_gamma( float gamma ); + STBIDEF void stbi_ldr_to_hdr_scale( float scale ); +#endif // STBI_NO_LINEAR + + // stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR + STBIDEF int stbi_is_hdr_from_callbacks( stbi_io_callbacks const* clbk, void* user ); + STBIDEF int stbi_is_hdr_from_memory( stbi_uc const* buffer, int len ); +#ifndef STBI_NO_STDIO + STBIDEF int stbi_is_hdr( char const* filename ); + STBIDEF int stbi_is_hdr_from_file( FILE* f ); +#endif // STBI_NO_STDIO + + + // get a VERY brief reason for failure + // 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 ); + STBIDEF int stbi_is_16_bit_from_memory( stbi_uc const* buffer, int len ); + STBIDEF int stbi_is_16_bit_from_callbacks( stbi_io_callbacks const* clbk, void* user ); + +#ifndef STBI_NO_STDIO + STBIDEF int stbi_info( char const* filename, int* x, int* y, int* comp ); + STBIDEF int stbi_info_from_file( FILE* f, int* x, int* y, int* comp ); + STBIDEF int stbi_is_16_bit( char const* filename ); + STBIDEF int stbi_is_16_bit_from_file( FILE* f ); +#endif + + + + // for image formats that explicitly notate that they have premultiplied alpha, + // we just return the colors as stored in the file. set this flag to force + // unpremultiplication. results are undefined if the unpremultiply overflow. + STBIDEF void stbi_set_unpremultiply_on_load( int flag_true_if_should_unpremultiply ); + + // indicate whether we should process iphone images back to canonical format, + // or just pass them through "as-is" + STBIDEF void stbi_convert_iphone_png_to_rgb( int flag_true_if_should_convert ); + + // flip the image vertically, so the first pixel in the output array is the bottom left + STBIDEF void stbi_set_flip_vertically_on_load( int flag_true_if_should_flip ); + + // 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, pow +#endif + +#ifndef STBI_NO_STDIO +#include +#endif + +#ifndef STBI_ASSERT +#include +#define STBI_ASSERT(x) assert(x) +#endif + +#ifdef __cplusplus +#define STBI_EXTERN extern "C" +#else +#define STBI_EXTERN extern +#endif + + +#ifndef _MSC_VER +#ifdef __cplusplus +#define stbi_inline inline +#else +#define stbi_inline +#endif +#else +#define stbi_inline __forceinline +#endif + + +#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(__SSE2__) && !defined(STBI_NO_SIMD) +// gcc doesn't support sse2 intrinsics unless you compile with -msse2, +// which in turn means it gets to use SSE2 everywhere. This is unfortunate, +// but previous attempts to provide the SSE2 functions with runtime +// detection caused numerous issues. The way architecture extensions are +// exposed in GCC/Clang is, sadly, not really suited for one-file libs. +// New behavior: if compiled with -msse2, we use SSE2 without any +// detection; if not, we don't use it at all. +#define STBI_NO_SIMD +#endif + +#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) +// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET +// +// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the +// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. +// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not +// simultaneously enabling "-mstackrealign". +// +// See https://github.com/nothings/stb/issues/81 for more information. +// +// So default to no SSE2 on 32-bit MinGW. If you've read this far and added +// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. +#define STBI_NO_SIMD +#endif + +#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) +#define STBI_SSE2 +#include + +#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 + +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) +static int stbi__sse2_available( void ) +{ + int info3 = stbi__cpuid3(); + return ( ( info3 >> 26 ) & 1 ) != 0; +} +#endif + +#else // assume GCC-style if not VC++ +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) + +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) +static int stbi__sse2_available( void ) +{ + // If we're even attempting to compile this on GCC/Clang, that means + // -msse2 is on, which means the compiler is allowed to use SSE2 + // instructions at will, and so are we. + return 1; +} +#endif + +#endif +#endif + +// ARM NEON +#if defined(STBI_NO_SIMD) && defined(STBI_NEON) +#undef STBI_NEON +#endif + +#ifdef STBI_NEON +#include +// 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 ); +static int stbi__png_is16( stbi__context* s ); +#endif + +#ifndef STBI_NO_BMP +static int stbi__bmp_test( stbi__context* s ); +static void* stbi__bmp_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ); +static int stbi__bmp_info( stbi__context* s, int* x, int* y, int* comp ); +#endif + +#ifndef STBI_NO_TGA +static int stbi__tga_test( stbi__context* s ); +static void* stbi__tga_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ); +static int stbi__tga_info( stbi__context* s, int* x, int* y, int* comp ); +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_test( stbi__context* s ); +static void* stbi__psd_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri, int bpc ); +static int stbi__psd_info( stbi__context* s, int* x, int* y, int* comp ); +static int stbi__psd_is16( stbi__context* s ); +#endif + +#ifndef STBI_NO_HDR +static int stbi__hdr_test( stbi__context* s ); +static float* stbi__hdr_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ); +static int stbi__hdr_info( stbi__context* s, int* x, int* y, int* comp ); +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_test( stbi__context* s ); +static void* stbi__pic_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ); +static int stbi__pic_info( stbi__context* s, int* x, int* y, int* comp ); +#endif + +#ifndef STBI_NO_GIF +static int stbi__gif_test( stbi__context* s ); +static void* stbi__gif_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ); +static void* stbi__load_gif_main( stbi__context* s, int** delays, int* x, int* y, int* z, int* comp, int req_comp ); +static int stbi__gif_info( stbi__context* s, int* x, int* y, int* comp ); +#endif + +#ifndef STBI_NO_PNM +static int stbi__pnm_test( stbi__context* s ); +static void* stbi__pnm_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ); +static int stbi__pnm_info( stbi__context* s, int* x, int* y, int* comp ); +#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 +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) +static int stbi__mad4sizes_valid( int a, int b, int c, int d, int add ) +{ + return stbi__mul2sizes_valid( a, b ) && stbi__mul2sizes_valid( a * b, c ) && + stbi__mul2sizes_valid( a * b * c, d ) && stbi__addsizes_valid( a * b * c * d, add ); +} +#endif + +// 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 ); +} + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) +static void* stbi__malloc_mad4( int a, int b, int c, int d, int add ) +{ + if ( !stbi__mad4sizes_valid( a, b, c, d, add ) ) return NULL; + return stbi__malloc( a * b * c * d + add ); +} +#endif + +// 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 void stbi__vertical_flip( void* image, int w, int h, int bytes_per_pixel ) +{ + int row; + size_t bytes_per_row = (size_t)w * bytes_per_pixel; + stbi_uc temp[2048]; + stbi_uc* bytes = (stbi_uc*)image; + + for ( row = 0; row < ( h >> 1 ); row++ ) { + stbi_uc* row0 = bytes + row * bytes_per_row; + stbi_uc* row1 = bytes + ( h - row - 1 ) * bytes_per_row; + // swap row0 with row1 + size_t bytes_left = bytes_per_row; + while ( bytes_left ) { + size_t bytes_copy = ( bytes_left < sizeof( temp ) ) ? bytes_left : sizeof( temp ); + memcpy( temp, row0, bytes_copy ); + memcpy( row0, row1, bytes_copy ); + memcpy( row1, temp, bytes_copy ); + row0 += bytes_copy; + row1 += bytes_copy; + bytes_left -= bytes_copy; + } + } +} + +#ifndef STBI_NO_GIF +static void stbi__vertical_flip_slices( void* image, int w, int h, int z, int bytes_per_pixel ) +{ + int slice; + int slice_size = w * h * bytes_per_pixel; + + stbi_uc* bytes = (stbi_uc*)image; + for ( slice = 0; slice < z; ++slice ) { + stbi__vertical_flip( bytes, w, h, bytes_per_pixel ); + bytes += slice_size; + } +} +#endif + +static unsigned char* stbi__load_and_postprocess_8bit( stbi__context* s, int* x, int* y, int* comp, int req_comp ) +{ + stbi__result_info ri; + void* result = stbi__load_main( s, x, y, comp, req_comp, &ri, 8 ); + + if ( result == NULL ) + return NULL; + + 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 channels = req_comp ? req_comp : *comp; + stbi__vertical_flip( result, *x, *y, channels * sizeof( stbi_uc ) ); + } + + return (unsigned char*)result; +} + +static stbi__uint16* stbi__load_and_postprocess_16bit( stbi__context* s, int* x, int* y, int* comp, int req_comp ) +{ + stbi__result_info ri; + void* result = stbi__load_main( s, x, y, comp, req_comp, &ri, 16 ); + + if ( result == NULL ) + return NULL; + + 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 channels = req_comp ? req_comp : *comp; + stbi__vertical_flip( result, *x, *y, channels * sizeof( stbi__uint16 ) ); + } + + return (stbi__uint16*)result; +} + +#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR) +static void stbi__float_postprocess( float* result, int* x, int* y, int* comp, int req_comp ) +{ + if ( stbi__vertically_flip_on_load && result != NULL ) { + int channels = req_comp ? req_comp : *comp; + stbi__vertical_flip( result, *x, *y, channels * sizeof( float ) ); + } +} +#endif + +#ifndef STBI_NO_STDIO + +#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) +STBI_EXTERN __declspec( dllimport ) int __stdcall MultiByteToWideChar( unsigned int cp, unsigned long flags, const char* str, int cbmb, wchar_t* widestr, int cchwide ); +STBI_EXTERN __declspec( dllimport ) int __stdcall WideCharToMultiByte( unsigned int cp, unsigned long flags, const wchar_t* widestr, int cchwide, char* str, int cbmb, const char* defchar, int* used_default ); +#endif + +#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) +STBIDEF int stbi_convert_wchar_to_utf8( char* buffer, size_t bufferlen, const wchar_t* input ) +{ + return WideCharToMultiByte( 65001 /* UTF8 */, 0, input, -1, buffer, (int)bufferlen, NULL, NULL ); +} +#endif + +static FILE* stbi__fopen( char const* filename, char const* mode ) +{ + FILE* f; +#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) + wchar_t wMode[64]; + wchar_t wFilename[1024]; + if ( 0 == MultiByteToWideChar( 65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof( wFilename ) ) ) + return 0; + + if ( 0 == MultiByteToWideChar( 65001 /* UTF8 */, 0, mode, -1, wMode, sizeof( wMode ) ) ) + return 0; + +#if _MSC_VER >= 1400 + if ( 0 != _wfopen_s( &f, wFilename, wMode ) ) + f = 0; +#else + f = _wfopen( wFilename, wMode ); +#endif + +#elif defined(_MSC_VER) && _MSC_VER >= 1400 + if ( 0 != fopen_s( &f, filename, mode ) ) + f = 0; +#else + f = fopen( filename, mode ); +#endif + return f; +} + + +STBIDEF stbi_uc* stbi_load( char const* filename, int* x, int* y, int* comp, int req_comp ) +{ + FILE* f = stbi__fopen( filename, "rb" ); + unsigned char* result; + if ( !f ) return stbi__errpuc( "can't fopen", "Unable to open file" ); + result = stbi_load_from_file( f, x, y, comp, req_comp ); + fclose( f ); + return result; +} + +STBIDEF stbi_uc* stbi_load_from_file( FILE* f, int* x, int* y, int* comp, int req_comp ) +{ + unsigned char* result; + stbi__context s; + stbi__start_file( &s, f ); + result = stbi__load_and_postprocess_8bit( &s, x, y, comp, req_comp ); + if ( result ) { + // need to 'unget' all the characters in the IO buffer + fseek( f, -(int)( s.img_buffer_end - s.img_buffer ), SEEK_CUR ); + } + return result; +} + +STBIDEF stbi__uint16* stbi_load_from_file_16( FILE* f, int* x, int* y, int* comp, int req_comp ) +{ + stbi__uint16* result; + stbi__context s; + stbi__start_file( &s, f ); + result = stbi__load_and_postprocess_16bit( &s, x, y, comp, req_comp ); + if ( result ) { + // need to 'unget' all the characters in the IO buffer + fseek( f, -(int)( s.img_buffer_end - s.img_buffer ), SEEK_CUR ); + } + return result; +} + +STBIDEF stbi_us* stbi_load_16( char const* filename, int* x, int* y, int* comp, int req_comp ) +{ + FILE* f = stbi__fopen( filename, "rb" ); + stbi__uint16* result; + if ( !f ) return (stbi_us*)stbi__errpuc( "can't fopen", "Unable to open file" ); + result = stbi_load_from_file_16( f, x, y, comp, req_comp ); + fclose( f ); + return result; +} + + +#endif //!STBI_NO_STDIO + +STBIDEF stbi_us* stbi_load_16_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* channels_in_file, int desired_channels ) +{ + stbi__context s; + stbi__start_mem( &s, buffer, len ); + return stbi__load_and_postprocess_16bit( &s, x, y, channels_in_file, desired_channels ); +} + +STBIDEF stbi_us* stbi_load_16_from_callbacks( stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* channels_in_file, int desired_channels ) +{ + stbi__context s; + stbi__start_callbacks( &s, (stbi_io_callbacks*)clbk, user ); + return stbi__load_and_postprocess_16bit( &s, x, y, channels_in_file, desired_channels ); +} + +STBIDEF stbi_uc* stbi_load_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* comp, int req_comp ) +{ + stbi__context s; + stbi__start_mem( &s, buffer, len ); + return stbi__load_and_postprocess_8bit( &s, x, y, comp, req_comp ); +} + +STBIDEF stbi_uc* stbi_load_from_callbacks( stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp, int req_comp ) +{ + stbi__context s; + stbi__start_callbacks( &s, (stbi_io_callbacks*)clbk, user ); + return stbi__load_and_postprocess_8bit( &s, x, y, comp, req_comp ); +} + +#ifndef STBI_NO_GIF +STBIDEF stbi_uc* stbi_load_gif_from_memory( stbi_uc const* buffer, int len, int** delays, int* x, int* y, int* z, int* comp, int req_comp ) +{ + unsigned char* result; + stbi__context s; + stbi__start_mem( &s, buffer, len ); + + result = (unsigned char*)stbi__load_gif_main( &s, delays, x, y, z, comp, req_comp ); + if ( stbi__vertically_flip_on_load ) { + stbi__vertical_flip_slices( result, *x, *y, *z, *comp ); + } + + return result; +} +#endif + +#ifndef STBI_NO_LINEAR +static float* stbi__loadf_main( stbi__context* s, int* x, int* y, int* comp, int req_comp ) +{ + unsigned char* data; +#ifndef STBI_NO_HDR + if ( stbi__hdr_test( s ) ) { + stbi__result_info ri; + float* hdr_data = stbi__hdr_load( s, x, y, comp, req_comp, &ri ); + if ( hdr_data ) + stbi__float_postprocess( hdr_data, x, y, comp, req_comp ); + return hdr_data; + } +#endif + data = stbi__load_and_postprocess_8bit( s, x, y, comp, req_comp ); + if ( data ) + return stbi__ldr_to_hdr( data, *x, *y, req_comp ? req_comp : *comp ); + return stbi__errpf( "unknown image type", "Image not of any known type, or corrupt" ); +} + +STBIDEF float* stbi_loadf_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* comp, int req_comp ) +{ + stbi__context s; + stbi__start_mem( &s, buffer, len ); + return stbi__loadf_main( &s, x, y, comp, req_comp ); +} + +STBIDEF float* stbi_loadf_from_callbacks( stbi_io_callbacks const* clbk, void* user, int* x, int* y, int* comp, int req_comp ) +{ + stbi__context s; + stbi__start_callbacks( &s, (stbi_io_callbacks*)clbk, user ); + return stbi__loadf_main( &s, x, y, comp, req_comp ); +} + +#ifndef STBI_NO_STDIO +STBIDEF float* stbi_loadf( char const* filename, int* x, int* y, int* comp, int req_comp ) +{ + float* result; + FILE* f = stbi__fopen( filename, "rb" ); + if ( !f ) return stbi__errpf( "can't fopen", "Unable to open file" ); + result = stbi_loadf_from_file( f, x, y, comp, req_comp ); + fclose( f ); + return result; +} + +STBIDEF float* stbi_loadf_from_file( FILE* f, int* x, int* y, int* comp, int req_comp ) +{ + stbi__context s; + stbi__start_file( &s, f ); + return stbi__loadf_main( &s, x, y, comp, req_comp ); +} +#endif // !STBI_NO_STDIO + +#endif // !STBI_NO_LINEAR + +// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is +// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always +// reports false! + +STBIDEF int stbi_is_hdr_from_memory( stbi_uc const* buffer, int len ) +{ +#ifndef STBI_NO_HDR + stbi__context s; + stbi__start_mem( &s, buffer, len ); + return stbi__hdr_test( &s ); +#else + STBI_NOTUSED( buffer ); + STBI_NOTUSED( len ); + return 0; +#endif +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr( char const* filename ) +{ + FILE* f = stbi__fopen( filename, "rb" ); + int result = 0; + if ( f ) { + result = stbi_is_hdr_from_file( f ); + fclose( f ); + } + return result; +} + +STBIDEF int stbi_is_hdr_from_file( FILE* f ) +{ +#ifndef STBI_NO_HDR + long pos = ftell( f ); + int res; + stbi__context s; + stbi__start_file( &s, f ); + res = stbi__hdr_test( &s ); + fseek( f, pos, SEEK_SET ); + return res; +#else + STBI_NOTUSED( f ); + return 0; +#endif +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_is_hdr_from_callbacks( stbi_io_callbacks const* clbk, void* user ) +{ +#ifndef STBI_NO_HDR + stbi__context s; + stbi__start_callbacks( &s, (stbi_io_callbacks*)clbk, user ); + return stbi__hdr_test( &s ); +#else + STBI_NOTUSED( clbk ); + STBI_NOTUSED( user ); + return 0; +#endif +} + +#ifndef STBI_NO_LINEAR +static float stbi__l2h_gamma = 2.2f, stbi__l2h_scale = 1.0f; + +STBIDEF void stbi_ldr_to_hdr_gamma( float gamma ) { stbi__l2h_gamma = gamma; } +STBIDEF void stbi_ldr_to_hdr_scale( float scale ) { stbi__l2h_scale = scale; } +#endif + +static float stbi__h2l_gamma_i = 1.0f / 2.2f, stbi__h2l_scale_i = 1.0f; + +STBIDEF void stbi_hdr_to_ldr_gamma( float gamma ) { stbi__h2l_gamma_i = 1 / gamma; } +STBIDEF void stbi_hdr_to_ldr_scale( float scale ) { stbi__h2l_scale_i = 1 / scale; } + + +////////////////////////////////////////////////////////////////////////////// +// +// Common code used by all image loaders +// + +enum +{ + STBI__SCAN_load = 0, + STBI__SCAN_type, + STBI__SCAN_header +}; + +static void stbi__refill_buffer( stbi__context* s ) +{ + int n = ( s->io.read )( s->io_user_data, (char*)s->buffer_start, s->buflen ); + 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 ( n < comp ) { + for ( i = 0; i < x * y; ++i ) { + output[i * comp + n] = data[i * comp + n] / 255.0f; + } + } + STBI_FREE( data ); + return output; +} +#endif + +#ifndef STBI_NO_HDR +#define stbi__float2int(x) ((int) (x)) +static stbi_uc* stbi__hdr_to_ldr( float* data, int x, int y, int comp ) +{ + int i, k, n; + stbi_uc* output; + if ( !data ) return NULL; + output = (stbi_uc*)stbi__malloc_mad3( x, y, comp, 0 ); + if ( output == NULL ) { STBI_FREE( data ); return stbi__errpuc( "outofmem", "Out of memory" ); } + // compute number of non-alpha components + if ( comp & 1 ) n = comp; else n = comp - 1; + for ( i = 0; i < x * y; ++i ) { + for ( k = 0; k < n; ++k ) { + float z = (float)pow( data[i * comp + k] * stbi__h2l_scale_i, stbi__h2l_gamma_i ) * 255 + 0.5f; + if ( z < 0 ) z = 0; + if ( z > 255 ) z = 255; + output[i * comp + k] = (stbi_uc)stbi__float2int( z ); + } + if ( k < comp ) { + float z = data[i * comp + k] * 255 + 0.5f; + if ( z < 0 ) z = 0; + if ( z > 255 ) z = 255; + output[i * comp + k] = (stbi_uc)stbi__float2int( z ); + } + } + STBI_FREE( data ); + return output; +} +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// "baseline" JPEG/JFIF decoder +// +// simple implementation +// - doesn't support delayed output of y-dimension +// - simple interface (only one output format: 8-bit interleaved RGB) +// - doesn't try to recover corrupt jpegs +// - doesn't allow partial loading, loading multiple at once +// - still fast on x86 (copying globals into locals doesn't help x86) +// - allocates lots of intermediate memory (full size of all components) +// - non-interleaved case requires this anyway +// - allows good upsampling (see next) +// high-quality +// - upsampled channels are bilinearly interpolated, even across blocks +// - quality integer IDCT derived from IJG's 'slow' +// performance +// - fast huffman; reasonable integer IDCT +// - some SIMD kernels for common paths on targets with SSE2/NEON +// - uses a lot of intermediate memory, could cache poorly + +#ifndef STBI_NO_JPEG + +// huffman decoding acceleration +#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache + +typedef struct +{ + stbi_uc fast[1 << FAST_BITS]; + // weirdly, repacking this into AoS is a 10% speed loss, instead of a win + stbi__uint16 code[256]; + stbi_uc values[256]; + stbi_uc size[257]; + unsigned int maxcode[18]; + int delta[17]; // old 'firstsymbol' - old 'firstcode' +} stbi__huffman; + +typedef struct +{ + stbi__context* s; + stbi__huffman huff_dc[4]; + stbi__huffman huff_ac[4]; + stbi__uint16 dequant[4][64]; + stbi__int16 fast_ac[4][1 << FAST_BITS]; + + // sizes for components, interleaved MCUs + int img_h_max, img_v_max; + int img_mcu_x, img_mcu_y; + int img_mcu_w, img_mcu_h; + + // definition of jpeg image component + struct + { + int id; + int h, v; + int tq; + int hd, ha; + int dc_pred; + + int x, y, w2, h2; + stbi_uc* data; + void* raw_data, * raw_coeff; + stbi_uc* linebuf; + short* coeff; // progressive only + int coeff_w, coeff_h; // number of 8x8 coefficient blocks + } img_comp[4]; + + stbi__uint32 code_buffer; // jpeg entropy-coded buffer + int code_bits; // number of valid bits + unsigned char marker; // marker seen while filling entropy buffer + int nomore; // flag if we saw a marker so must stop + + int progressive; + int spec_start; + int spec_end; + int succ_high; + int succ_low; + int eob_run; + int jfif; + int app14_color_transform; // Adobe APP14 tag + int rgb; + + int scan_n, order[4]; + int restart_interval, todo; + + // kernels + void ( *idct_block_kernel )( stbi_uc* out, int out_stride, short data[64] ); + void ( *YCbCr_to_RGB_kernel )( stbi_uc* out, const stbi_uc* y, const stbi_uc* pcb, const stbi_uc* pcr, int count, int step ); + stbi_uc* ( *resample_row_hv_2_kernel )( stbi_uc* out, stbi_uc* in_near, stbi_uc* in_far, int w, int hs ); +} stbi__jpeg; + +static int stbi__build_huffman( stbi__huffman* h, int* count ) +{ + int i, j, k = 0; + unsigned int code; + // build size list for each symbol (from JPEG spec) + for ( i = 0; i < 16; ++i ) + for ( j = 0; j < count[i]; ++j ) + h->size[k++] = (stbi_uc)( i + 1 ); + h->size[k] = 0; + + // compute actual symbols (from jpeg spec) + code = 0; + k = 0; + for ( j = 1; j <= 16; ++j ) { + // compute delta to add to code to compute symbol id + h->delta[j] = k - code; + if ( h->size[k] == j ) { + while ( h->size[k] == j ) + h->code[k++] = (stbi__uint16)( code++ ); + if ( code - 1 >= ( 1u << j ) ) return stbi__err( "bad code lengths", "Corrupt JPEG" ); + } + // compute largest code + 1 for this size, preshifted as needed later + h->maxcode[j] = code << ( 16 - j ); + code <<= 1; + } + h->maxcode[j] = 0xffffffff; + + // build non-spec acceleration table; 255 is flag for not-accelerated + memset( h->fast, 255, 1 << FAST_BITS ); + for ( i = 0; i < k; ++i ) { + int s = h->size[i]; + if ( s <= FAST_BITS ) { + int c = h->code[i] << ( FAST_BITS - s ); + int m = 1 << ( FAST_BITS - s ); + for ( j = 0; j < m; ++j ) { + h->fast[c + j] = (stbi_uc)i; + } + } + } + return 1; +} + +// build a table that decodes both magnitude and value of small ACs in +// one go. +static void stbi__build_fast_ac( stbi__int16* fast_ac, stbi__huffman* h ) +{ + int i; + for ( i = 0; i < ( 1 << FAST_BITS ); ++i ) { + stbi_uc fast = h->fast[i]; + fast_ac[i] = 0; + if ( fast < 255 ) { + int rs = h->values[fast]; + int run = ( rs >> 4 ) & 15; + int magbits = rs & 15; + int len = h->size[fast]; + + if ( magbits && len + magbits <= FAST_BITS ) { + // magnitude code followed by receive_extend code + int k = ( ( i << len ) & ( ( 1 << FAST_BITS ) - 1 ) ) >> ( FAST_BITS - magbits ); + int m = 1 << ( magbits - 1 ); + if ( k < m ) k += ( ~0U << magbits ) + 1; + // if the result is small enough, we can fit it in fast_ac table + if ( k >= -128 && k <= 127 ) + fast_ac[i] = (stbi__int16)( ( k * 256 ) + ( run * 16 ) + ( len + magbits ) ); + } + } + } +} + +static void stbi__grow_buffer_unsafe( stbi__jpeg* j ) +{ + do { + unsigned int b = j->nomore ? 0 : stbi__get8( j->s ); + if ( b == 0xff ) { + int c = stbi__get8( j->s ); + while ( c == 0xff ) c = stbi__get8( j->s ); // consume fill bytes + if ( c != 0 ) { + j->marker = (unsigned char)c; + j->nomore = 1; + return; + } + } + j->code_buffer |= b << ( 24 - j->code_bits ); + j->code_bits += 8; + } while ( j->code_bits <= 24 ); +} + +// (1 << n) - 1 +static const stbi__uint32 stbi__bmask[17] = { 0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535 }; + +// decode a jpeg huffman value from the bitstream +stbi_inline static int stbi__jpeg_huff_decode( stbi__jpeg* j, stbi__huffman* h ) +{ + unsigned int temp; + int c, k; + + if ( j->code_bits < 16 ) stbi__grow_buffer_unsafe( j ); + + // look at the top FAST_BITS and determine what symbol ID it is, + // if the code is <= FAST_BITS + c = ( j->code_buffer >> ( 32 - FAST_BITS ) ) & ( ( 1 << FAST_BITS ) - 1 ); + k = h->fast[c]; + if ( k < 255 ) { + int s = h->size[k]; + if ( s > j->code_bits ) + return -1; + j->code_buffer <<= s; + j->code_bits -= s; + return h->values[k]; + } + + // naive test is to shift the code_buffer down so k bits are + // valid, then test against maxcode. To speed this up, we've + // preshifted maxcode left so that it has (16-k) 0s at the + // end; in other words, regardless of the number of bits, it + // wants to be compared against something shifted to have 16; + // that way we don't need to shift inside the loop. + temp = j->code_buffer >> 16; + for ( k = FAST_BITS + 1; ; ++k ) + if ( temp < h->maxcode[k] ) + break; + if ( k == 17 ) { + // error! code not found + j->code_bits -= 16; + return -1; + } + + if ( k > j->code_bits ) + return -1; + + // convert the huffman code to the symbol id + c = ( ( j->code_buffer >> ( 32 - k ) ) & stbi__bmask[k] ) + h->delta[k]; + 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 const stbi_uc stbi__jpeg_dezigzag[64 + 15] = +{ + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63, + // let corrupt input sample past end + 63, 63, 63, 63, 63, 63, 63, 63, + 63, 63, 63, 63, 63, 63, 63 +}; + +// decode one 64-entry block-- +static int stbi__jpeg_decode_block( stbi__jpeg* j, short data[64], stbi__huffman* hdc, stbi__huffman* hac, stbi__int16* fac, int b, stbi__uint16* dequant ) +{ + int diff, dc, k; + int t; + + if ( j->code_bits < 16 ) stbi__grow_buffer_unsafe( j ); + t = stbi__jpeg_huff_decode( j, hdc ); + if ( t < 0 ) 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) * 4096) + +// derived from jidctint -- DCT_ISLOW +#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ + int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ + p2 = s2; \ + p3 = s6; \ + p1 = (p2+p3) * stbi__f2f(0.5411961f); \ + t2 = p1 + p3*stbi__f2f(-1.847759065f); \ + t3 = p1 + p2*stbi__f2f( 0.765366865f); \ + p2 = s0; \ + p3 = s4; \ + t0 = stbi__fsh(p2+p3); \ + t1 = stbi__fsh(p2-p3); \ + x0 = t0+t3; \ + x3 = t0-t3; \ + x1 = t1+t2; \ + x2 = t1-t2; \ + t0 = s7; \ + t1 = s5; \ + t2 = s3; \ + t3 = s1; \ + p3 = t0+t2; \ + p4 = t1+t3; \ + p1 = t0+t3; \ + p2 = t1+t2; \ + p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ + t0 = t0*stbi__f2f( 0.298631336f); \ + t1 = t1*stbi__f2f( 2.053119869f); \ + t2 = t2*stbi__f2f( 3.072711026f); \ + t3 = t3*stbi__f2f( 1.501321110f); \ + p1 = p5 + p1*stbi__f2f(-0.899976223f); \ + p2 = p5 + p2*stbi__f2f(-2.562915447f); \ + p3 = p3*stbi__f2f(-1.961570560f); \ + p4 = p4*stbi__f2f(-0.390180644f); \ + t3 += p1+p4; \ + t2 += p2+p3; \ + t1 += p2+p4; \ + t0 += p1+p3; + +static void stbi__idct_block( stbi_uc* out, int out_stride, short data[64] ) +{ + int i, val[64], * v = val; + stbi_uc* o; + short* d = data; + + // columns + for ( i = 0; i < 8; ++i, ++d, ++v ) { + // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing + if ( d[8] == 0 && d[16] == 0 && d[24] == 0 && d[32] == 0 + && d[40] == 0 && d[48] == 0 && d[56] == 0 ) { + // no shortcut 0 seconds + // (1|2|3|4|5|6|7)==0 0 seconds + // all separate -0.047 seconds + // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds + int dcterm = d[0] * 4; + v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; + } + else { + STBI__IDCT_1D( d[0], d[8], d[16], d[24], d[32], d[40], d[48], d[56] ) + // constants scaled things up by 1<<12; let's bring them back + // down, but keep 2 extra bits of precision + x0 += 512; x1 += 512; x2 += 512; x3 += 512; + v[0] = ( x0 + t3 ) >> 10; + v[56] = ( x0 - t3 ) >> 10; + v[8] = ( x1 + t2 ) >> 10; + v[48] = ( x1 - t2 ) >> 10; + v[16] = ( x2 + t1 ) >> 10; + v[40] = ( x2 - t1 ) >> 10; + v[24] = ( x3 + t0 ) >> 10; + v[32] = ( x3 - t0 ) >> 10; + } + } + + for ( i = 0, v = val, o = out; i < 8; ++i, v += 8, o += out_stride ) { + // no fast case since the first 1D IDCT spread components out + STBI__IDCT_1D( v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7] ) + // constants scaled things up by 1<<12, plus we had 1<<2 from first + // loop, plus horizontal and vertical each scale by sqrt(8) so together + // we've got an extra 1<<3, so 1<<17 total we need to remove. + // so we want to round that, which means adding 0.5 * 1<<17, + // aka 65536. Also, we'll end up with -128 to 127 that we want + // to encode as 0..255 by adding 128, so we'll add that before the shift + x0 += 65536 + ( 128 << 17 ); + x1 += 65536 + ( 128 << 17 ); + x2 += 65536 + ( 128 << 17 ); + x3 += 65536 + ( 128 << 17 ); + // tried computing the shifts into temps, or'ing the temps to see + // if any were out of range, but that was slower + o[0] = stbi__clamp( ( x0 + t3 ) >> 17 ); + o[7] = stbi__clamp( ( x0 - t3 ) >> 17 ); + o[1] = stbi__clamp( ( x1 + t2 ) >> 17 ); + o[6] = stbi__clamp( ( x1 - t2 ) >> 17 ); + o[2] = stbi__clamp( ( x2 + t1 ) >> 17 ); + o[5] = stbi__clamp( ( x2 - t1 ) >> 17 ); + o[3] = stbi__clamp( ( x3 + t0 ) >> 17 ); + o[4] = stbi__clamp( ( x3 - t0 ) >> 17 ); + } +} + +#ifdef STBI_SSE2 +// sse2 integer IDCT. not the fastest possible implementation but it +// produces bit-identical results to the generic C version so it's +// fully "transparent". +static void stbi__idct_simd( stbi_uc* out, int out_stride, short data[64] ) +{ + // This is constructed to match our regular (generic) integer IDCT exactly. + __m128i row0, row1, row2, row3, row4, row5, row6, row7; + __m128i tmp; + + // dot product constant: even elems=x, odd elems=y +#define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) + +// out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) +// out(1) = c1[even]*x + c1[odd]*y +#define dct_rot(out0,out1, x,y,c0,c1) \ + __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ + __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ + __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ + __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ + __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ + __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) + + // out = in << 12 (in 16-bit, out 32-bit) +#define dct_widen(out, in) \ + __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ + __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) + + // wide add +#define dct_wadd(out, a, b) \ + __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_add_epi32(a##_h, b##_h) + + // wide sub +#define dct_wsub(out, a, b) \ + __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ + __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) + + // butterfly a/b, add bias, then shift by "s" and pack +#define dct_bfly32o(out0, out1, a,b,bias,s) \ + { \ + __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ + __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ + dct_wadd(sum, abiased, b); \ + dct_wsub(dif, abiased, b); \ + out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ + out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ + } + + // 8-bit interleave step (for transposes) +#define dct_interleave8(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi8(a, b); \ + b = _mm_unpackhi_epi8(tmp, b) + + // 16-bit interleave step (for transposes) +#define dct_interleave16(a, b) \ + tmp = a; \ + a = _mm_unpacklo_epi16(a, b); \ + b = _mm_unpackhi_epi16(tmp, b) + +#define dct_pass(bias,shift) \ + { \ + /* even part */ \ + dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ + __m128i sum04 = _mm_add_epi16(row0, row4); \ + __m128i dif04 = _mm_sub_epi16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ + dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ + __m128i sum17 = _mm_add_epi16(row1, row7); \ + __m128i sum35 = _mm_add_epi16(row3, row5); \ + dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ + dct_wadd(x4, y0o, y4o); \ + dct_wadd(x5, y1o, y5o); \ + dct_wadd(x6, y2o, y5o); \ + dct_wadd(x7, y3o, y4o); \ + dct_bfly32o(row0,row7, x0,x7,bias,shift); \ + dct_bfly32o(row1,row6, x1,x6,bias,shift); \ + dct_bfly32o(row2,row5, x2,x5,bias,shift); \ + dct_bfly32o(row3,row4, x3,x4,bias,shift); \ + } + + __m128i rot0_0 = dct_const( stbi__f2f( 0.5411961f ), stbi__f2f( 0.5411961f ) + stbi__f2f( -1.847759065f ) ); + __m128i rot0_1 = dct_const( stbi__f2f( 0.5411961f ) + stbi__f2f( 0.765366865f ), stbi__f2f( 0.5411961f ) ); + __m128i rot1_0 = dct_const( stbi__f2f( 1.175875602f ) + stbi__f2f( -0.899976223f ), stbi__f2f( 1.175875602f ) ); + __m128i rot1_1 = dct_const( stbi__f2f( 1.175875602f ), stbi__f2f( 1.175875602f ) + stbi__f2f( -2.562915447f ) ); + __m128i rot2_0 = dct_const( stbi__f2f( -1.961570560f ) + stbi__f2f( 0.298631336f ), stbi__f2f( -1.961570560f ) ); + __m128i rot2_1 = dct_const( stbi__f2f( -1.961570560f ), stbi__f2f( -1.961570560f ) + stbi__f2f( 3.072711026f ) ); + __m128i rot3_0 = dct_const( stbi__f2f( -0.390180644f ) + stbi__f2f( 2.053119869f ), stbi__f2f( -0.390180644f ) ); + __m128i rot3_1 = dct_const( stbi__f2f( -0.390180644f ), stbi__f2f( -0.390180644f ) + stbi__f2f( 1.501321110f ) ); + + // rounding biases in column/row passes, see stbi__idct_block for explanation. + __m128i bias_0 = _mm_set1_epi32( 512 ); + __m128i bias_1 = _mm_set1_epi32( 65536 + ( 128 << 17 ) ); + + // load + row0 = _mm_load_si128( ( const __m128i* ) ( data + 0 * 8 ) ); + row1 = _mm_load_si128( ( const __m128i* ) ( data + 1 * 8 ) ); + row2 = _mm_load_si128( ( const __m128i* ) ( data + 2 * 8 ) ); + row3 = _mm_load_si128( ( const __m128i* ) ( data + 3 * 8 ) ); + row4 = _mm_load_si128( ( const __m128i* ) ( data + 4 * 8 ) ); + row5 = _mm_load_si128( ( const __m128i* ) ( data + 5 * 8 ) ); + row6 = _mm_load_si128( ( const __m128i* ) ( data + 6 * 8 ) ); + row7 = _mm_load_si128( ( const __m128i* ) ( data + 7 * 8 ) ); + + // column pass + dct_pass( bias_0, 10 ); + + { + // 16bit 8x8 transpose pass 1 + dct_interleave16( row0, row4 ); + dct_interleave16( row1, row5 ); + dct_interleave16( row2, row6 ); + dct_interleave16( row3, row7 ); + + // transpose pass 2 + dct_interleave16( row0, row2 ); + dct_interleave16( row1, row3 ); + dct_interleave16( row4, row6 ); + dct_interleave16( row5, row7 ); + + // transpose pass 3 + dct_interleave16( row0, row1 ); + dct_interleave16( row2, row3 ); + dct_interleave16( row4, row5 ); + dct_interleave16( row6, row7 ); + } + + // row pass + dct_pass( bias_1, 17 ); + + { + // pack + __m128i p0 = _mm_packus_epi16( row0, row1 ); // a0a1a2a3...a7b0b1b2b3...b7 + __m128i p1 = _mm_packus_epi16( row2, row3 ); + __m128i p2 = _mm_packus_epi16( row4, row5 ); + __m128i p3 = _mm_packus_epi16( row6, row7 ); + + // 8bit 8x8 transpose pass 1 + dct_interleave8( p0, p2 ); // a0e0a1e1... + dct_interleave8( p1, p3 ); // c0g0c1g1... + + // transpose pass 2 + dct_interleave8( p0, p1 ); // a0c0e0g0... + dct_interleave8( p2, p3 ); // b0d0f0h0... + + // transpose pass 3 + dct_interleave8( p0, p2 ); // a0b0c0d0... + dct_interleave8( p1, p3 ); // a4b4c4d4... + + // store + _mm_storel_epi64( ( __m128i* ) out, p0 ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, _mm_shuffle_epi32( p0, 0x4e ) ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, p2 ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, _mm_shuffle_epi32( p2, 0x4e ) ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, p1 ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, _mm_shuffle_epi32( p1, 0x4e ) ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, p3 ); out += out_stride; + _mm_storel_epi64( ( __m128i* ) out, _mm_shuffle_epi32( p3, 0x4e ) ); + } + +#undef dct_const +#undef dct_rot +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_interleave8 +#undef dct_interleave16 +#undef dct_pass +} + +#endif // STBI_SSE2 + +#ifdef STBI_NEON + +// NEON integer IDCT. should produce bit-identical +// results to the generic C version. +static void stbi__idct_simd( stbi_uc* out, int out_stride, short data[64] ) +{ + int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; + + int16x4_t rot0_0 = vdup_n_s16( stbi__f2f( 0.5411961f ) ); + int16x4_t rot0_1 = vdup_n_s16( stbi__f2f( -1.847759065f ) ); + int16x4_t rot0_2 = vdup_n_s16( stbi__f2f( 0.765366865f ) ); + int16x4_t rot1_0 = vdup_n_s16( stbi__f2f( 1.175875602f ) ); + int16x4_t rot1_1 = vdup_n_s16( stbi__f2f( -0.899976223f ) ); + int16x4_t rot1_2 = vdup_n_s16( stbi__f2f( -2.562915447f ) ); + int16x4_t rot2_0 = vdup_n_s16( stbi__f2f( -1.961570560f ) ); + int16x4_t rot2_1 = vdup_n_s16( stbi__f2f( -0.390180644f ) ); + int16x4_t rot3_0 = vdup_n_s16( stbi__f2f( 0.298631336f ) ); + int16x4_t rot3_1 = vdup_n_s16( stbi__f2f( 2.053119869f ) ); + int16x4_t rot3_2 = vdup_n_s16( stbi__f2f( 3.072711026f ) ); + int16x4_t rot3_3 = vdup_n_s16( stbi__f2f( 1.501321110f ) ); + +#define dct_long_mul(out, inq, coeff) \ + int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) + +#define dct_long_mac(out, acc, inq, coeff) \ + int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ + int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) + +#define dct_widen(out, inq) \ + int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ + int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) + + // wide add +#define dct_wadd(out, a, b) \ + int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vaddq_s32(a##_h, b##_h) + +// wide sub +#define dct_wsub(out, a, b) \ + int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ + int32x4_t out##_h = vsubq_s32(a##_h, b##_h) + +// butterfly a/b, then shift using "shiftop" by "s" and pack +#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ + { \ + dct_wadd(sum, a, b); \ + dct_wsub(dif, a, b); \ + out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ + out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ + } + +#define dct_pass(shiftop, shift) \ + { \ + /* even part */ \ + int16x8_t sum26 = vaddq_s16(row2, row6); \ + dct_long_mul(p1e, sum26, rot0_0); \ + dct_long_mac(t2e, p1e, row6, rot0_1); \ + dct_long_mac(t3e, p1e, row2, rot0_2); \ + int16x8_t sum04 = vaddq_s16(row0, row4); \ + int16x8_t dif04 = vsubq_s16(row0, row4); \ + dct_widen(t0e, sum04); \ + dct_widen(t1e, dif04); \ + dct_wadd(x0, t0e, t3e); \ + dct_wsub(x3, t0e, t3e); \ + dct_wadd(x1, t1e, t2e); \ + dct_wsub(x2, t1e, t2e); \ + /* odd part */ \ + int16x8_t sum15 = vaddq_s16(row1, row5); \ + int16x8_t sum17 = vaddq_s16(row1, row7); \ + int16x8_t sum35 = vaddq_s16(row3, row5); \ + int16x8_t sum37 = vaddq_s16(row3, row7); \ + int16x8_t sumodd = vaddq_s16(sum17, sum35); \ + dct_long_mul(p5o, sumodd, rot1_0); \ + dct_long_mac(p1o, p5o, sum17, rot1_1); \ + dct_long_mac(p2o, p5o, sum35, rot1_2); \ + dct_long_mul(p3o, sum37, rot2_0); \ + dct_long_mul(p4o, sum15, rot2_1); \ + dct_wadd(sump13o, p1o, p3o); \ + dct_wadd(sump24o, p2o, p4o); \ + dct_wadd(sump23o, p2o, p3o); \ + dct_wadd(sump14o, p1o, p4o); \ + dct_long_mac(x4, sump13o, row7, rot3_0); \ + dct_long_mac(x5, sump24o, row5, rot3_1); \ + dct_long_mac(x6, sump23o, row3, rot3_2); \ + dct_long_mac(x7, sump14o, row1, rot3_3); \ + dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ + dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ + dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ + dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ + } + + // load + row0 = vld1q_s16( data + 0 * 8 ); + row1 = vld1q_s16( data + 1 * 8 ); + row2 = vld1q_s16( data + 2 * 8 ); + row3 = vld1q_s16( data + 3 * 8 ); + row4 = vld1q_s16( data + 4 * 8 ); + row5 = vld1q_s16( data + 5 * 8 ); + row6 = vld1q_s16( data + 6 * 8 ); + row7 = vld1q_s16( data + 7 * 8 ); + + // add DC bias + row0 = vaddq_s16( row0, vsetq_lane_s16( 1024, vdupq_n_s16( 0 ), 0 ) ); + + // column pass + dct_pass( vrshrn_n_s32, 10 ); + + // 16bit 8x8 transpose + { + // these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. + // whether compilers actually get this is another story, sadly. +#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } +#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } + + // pass 1 + dct_trn16( row0, row1 ); // a0b0a2b2a4b4a6b6 + dct_trn16( row2, row3 ); + dct_trn16( row4, row5 ); + dct_trn16( row6, row7 ); + + // pass 2 + dct_trn32( row0, row2 ); // a0b0c0d0a4b4c4d4 + dct_trn32( row1, row3 ); + dct_trn32( row4, row6 ); + dct_trn32( row5, row7 ); + + // pass 3 + dct_trn64( row0, row4 ); // a0b0c0d0e0f0g0h0 + dct_trn64( row1, row5 ); + dct_trn64( row2, row6 ); + dct_trn64( row3, row7 ); + +#undef dct_trn16 +#undef dct_trn32 +#undef dct_trn64 + } + + // row pass + // vrshrn_n_s32 only supports shifts up to 16, we need + // 17. so do a non-rounding shift of 16 first then follow + // up with a rounding shift by 1. + dct_pass( vshrn_n_s32, 16 ); + + { + // pack and round + uint8x8_t p0 = vqrshrun_n_s16( row0, 1 ); + uint8x8_t p1 = vqrshrun_n_s16( row1, 1 ); + uint8x8_t p2 = vqrshrun_n_s16( row2, 1 ); + uint8x8_t p3 = vqrshrun_n_s16( row3, 1 ); + uint8x8_t p4 = vqrshrun_n_s16( row4, 1 ); + uint8x8_t p5 = vqrshrun_n_s16( row5, 1 ); + uint8x8_t p6 = vqrshrun_n_s16( row6, 1 ); + uint8x8_t p7 = vqrshrun_n_s16( row7, 1 ); + + // again, these can translate into one instruction, but often don't. +#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } +#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } + + // sadly can't use interleaved stores here since we only write + // 8 bytes to each scan line! + + // 8x8 8-bit transpose pass 1 + dct_trn8_8( p0, p1 ); + dct_trn8_8( p2, p3 ); + dct_trn8_8( p4, p5 ); + dct_trn8_8( p6, p7 ); + + // pass 2 + dct_trn8_16( p0, p2 ); + dct_trn8_16( p1, p3 ); + dct_trn8_16( p4, p6 ); + dct_trn8_16( p5, p7 ); + + // pass 3 + dct_trn8_32( p0, p4 ); + dct_trn8_32( p1, p5 ); + dct_trn8_32( p2, p6 ); + dct_trn8_32( p3, p7 ); + + // store + vst1_u8( out, p0 ); out += out_stride; + vst1_u8( out, p1 ); out += out_stride; + vst1_u8( out, p2 ); out += out_stride; + vst1_u8( out, p3 ); out += out_stride; + vst1_u8( out, p4 ); out += out_stride; + vst1_u8( out, p5 ); out += out_stride; + vst1_u8( out, p6 ); out += out_stride; + vst1_u8( out, p7 ); + +#undef dct_trn8_8 +#undef dct_trn8_16 +#undef dct_trn8_32 + } + +#undef dct_long_mul +#undef dct_long_mac +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_pass +} + +#endif // STBI_NEON + +#define STBI__MARKER_none 0xff +// if there's a pending marker from the entropy stream, return that +// otherwise, fetch from the stream and get a marker. if there's no +// marker, return 0xff, which is never a valid marker value +static stbi_uc stbi__get_marker( stbi__jpeg * j ) +{ + stbi_uc x; + if ( j->marker != STBI__MARKER_none ) { x = j->marker; j->marker = STBI__MARKER_none; return x; } + x = stbi__get8( j->s ); + if ( x != 0xff ) return STBI__MARKER_none; + while ( x == 0xff ) + x = stbi__get8( j->s ); // consume repeated 0xff fill bytes + return x; +} + +// in each scan, we'll have scan_n components, and the order +// of the components is specified by order[] +#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) + +// after a restart interval, stbi__jpeg_reset the entropy decoder and +// the dc prediction +static void stbi__jpeg_reset( stbi__jpeg* j ) +{ + j->code_bits = 0; + j->code_buffer = 0; + j->nomore = 0; + j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0; + j->marker = STBI__MARKER_none; + j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; + j->eob_run = 0; + // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, + // since we don't even allow 1<<30 pixels +} + +static int stbi__parse_entropy_coded_data( stbi__jpeg* z ) +{ + stbi__jpeg_reset( z ); + if ( !z->progressive ) { + if ( z->scan_n == 1 ) { + int i, j; + STBI_SIMD_ALIGN( short, data[64] ); + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = ( z->img_comp[n].x + 7 ) >> 3; + int h = ( z->img_comp[n].y + 7 ) >> 3; + for ( j = 0; j < h; ++j ) { + for ( i = 0; i < w; ++i ) { + int ha = z->img_comp[n].ha; + if ( !stbi__jpeg_decode_block( z, data, z->huff_dc + z->img_comp[n].hd, z->huff_ac + ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq] ) ) return 0; + z->idct_block_kernel( z->img_comp[n].data + z->img_comp[n].w2 * j * 8 + i * 8, z->img_comp[n].w2, data ); + // every data block is an MCU, so countdown the restart interval + if ( --z->todo <= 0 ) { + if ( z->code_bits < 24 ) stbi__grow_buffer_unsafe( z ); + // if it's NOT a restart, then just bail, so we get corrupt data + // rather than no data + if ( !STBI__RESTART( z->marker ) ) return 1; + stbi__jpeg_reset( z ); + } + } + } + return 1; + } + else { // interleaved + int i, j, k, x, y; + STBI_SIMD_ALIGN( short, data[64] ); + for ( j = 0; j < z->img_mcu_y; ++j ) { + for ( i = 0; i < z->img_mcu_x; ++i ) { + // scan an interleaved mcu... process scan_n components in order + for ( k = 0; k < z->scan_n; ++k ) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for ( y = 0; y < z->img_comp[n].v; ++y ) { + for ( x = 0; x < z->img_comp[n].h; ++x ) { + int x2 = ( i * z->img_comp[n].h + x ) * 8; + int y2 = ( j * z->img_comp[n].v + y ) * 8; + int ha = z->img_comp[n].ha; + if ( !stbi__jpeg_decode_block( z, data, z->huff_dc + z->img_comp[n].hd, z->huff_ac + ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq] ) ) return 0; + z->idct_block_kernel( z->img_comp[n].data + z->img_comp[n].w2 * y2 + x2, z->img_comp[n].w2, data ); + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if ( --z->todo <= 0 ) { + if ( z->code_bits < 24 ) stbi__grow_buffer_unsafe( z ); + if ( !STBI__RESTART( z->marker ) ) return 1; + stbi__jpeg_reset( z ); + } + } + } + return 1; + } + } + else { + if ( z->scan_n == 1 ) { + int i, j; + int n = z->order[0]; + // non-interleaved data, we just need to process one block at a time, + // in trivial scanline order + // number of blocks to do just depends on how many actual "pixels" this + // component has, independent of interleaved MCU blocking and such + int w = ( z->img_comp[n].x + 7 ) >> 3; + int h = ( z->img_comp[n].y + 7 ) >> 3; + for ( j = 0; j < h; ++j ) { + for ( i = 0; i < w; ++i ) { + short* data = z->img_comp[n].coeff + 64 * ( i + j * z->img_comp[n].coeff_w ); + if ( z->spec_start == 0 ) { + if ( !stbi__jpeg_decode_block_prog_dc( z, data, &z->huff_dc[z->img_comp[n].hd], n ) ) + return 0; + } + else { + int ha = z->img_comp[n].ha; + if ( !stbi__jpeg_decode_block_prog_ac( z, data, &z->huff_ac[ha], z->fast_ac[ha] ) ) + return 0; + } + // every data block is an MCU, so countdown the restart interval + if ( --z->todo <= 0 ) { + if ( z->code_bits < 24 ) stbi__grow_buffer_unsafe( z ); + if ( !STBI__RESTART( z->marker ) ) return 1; + stbi__jpeg_reset( z ); + } + } + } + return 1; + } + else { // interleaved + int i, j, k, x, y; + for ( j = 0; j < z->img_mcu_y; ++j ) { + for ( i = 0; i < z->img_mcu_x; ++i ) { + // scan an interleaved mcu... process scan_n components in order + for ( k = 0; k < z->scan_n; ++k ) { + int n = z->order[k]; + // scan out an mcu's worth of this component; that's just determined + // by the basic H and V specified for the component + for ( y = 0; y < z->img_comp[n].v; ++y ) { + for ( x = 0; x < z->img_comp[n].h; ++x ) { + int x2 = ( i * z->img_comp[n].h + x ); + int y2 = ( j * z->img_comp[n].v + y ); + short* data = z->img_comp[n].coeff + 64 * ( x2 + y2 * z->img_comp[n].coeff_w ); + if ( !stbi__jpeg_decode_block_prog_dc( z, data, &z->huff_dc[z->img_comp[n].hd], n ) ) + return 0; + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if ( --z->todo <= 0 ) { + if ( z->code_bits < 24 ) stbi__grow_buffer_unsafe( z ); + if ( !STBI__RESTART( z->marker ) ) return 1; + stbi__jpeg_reset( z ); + } + } + } + return 1; + } + } +} + +static void stbi__jpeg_dequantize( short* data, stbi__uint16* dequant ) +{ + int i; + for ( i = 0; i < 64; ++i ) + data[i] *= dequant[i]; +} + +static void stbi__jpeg_finish( stbi__jpeg* z ) +{ + if ( z->progressive ) { + // dequantize and idct the data + int i, j, n; + for ( n = 0; n < z->s->img_n; ++n ) { + int w = ( z->img_comp[n].x + 7 ) >> 3; + int h = ( z->img_comp[n].y + 7 ) >> 3; + for ( j = 0; j < h; ++j ) { + for ( i = 0; i < w; ++i ) { + short* data = z->img_comp[n].coeff + 64 * ( i + j * z->img_comp[n].coeff_w ); + stbi__jpeg_dequantize( data, z->dequant[z->img_comp[n].tq] ); + z->idct_block_kernel( z->img_comp[n].data + z->img_comp[n].w2 * j * 8 + i * 8, z->img_comp[n].w2, data ); + } + } + } + } +} + +static int stbi__process_marker( stbi__jpeg* z, int m ) +{ + int L; + switch ( m ) { + case STBI__MARKER_none: // no marker found + return stbi__err( "expected marker", "Corrupt JPEG" ); + + case 0xDD: // DRI - specify restart interval + if ( stbi__get16be( z->s ) != 4 ) return stbi__err( "bad DRI len", "Corrupt JPEG" ); + z->restart_interval = stbi__get16be( z->s ); + return 1; + + case 0xDB: // DQT - define quantization table + L = stbi__get16be( z->s ) - 2; + while ( L > 0 ) { + int q = stbi__get8( z->s ); + int p = q >> 4, sixteen = ( p != 0 ); + int t = q & 15, i; + if ( p != 0 && p != 1 ) return stbi__err( "bad DQT type", "Corrupt JPEG" ); + if ( t > 3 ) return stbi__err( "bad DQT table", "Corrupt JPEG" ); + + for ( i = 0; i < 64; ++i ) + z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)( sixteen ? stbi__get16be( z->s ) : stbi__get8( z->s ) ); + L -= ( sixteen ? 129 : 65 ); + } + return L == 0; + + case 0xC4: // DHT - define huffman table + L = stbi__get16be( z->s ) - 2; + while ( L > 0 ) { + stbi_uc* v; + int sizes[16], i, n = 0; + int q = stbi__get8( z->s ); + int tc = q >> 4; + int th = q & 15; + if ( tc > 1 || th > 3 ) return stbi__err( "bad DHT header", "Corrupt JPEG" ); + for ( i = 0; i < 16; ++i ) { + sizes[i] = stbi__get8( z->s ); + n += sizes[i]; + } + L -= 17; + if ( tc == 0 ) { + if ( !stbi__build_huffman( z->huff_dc + th, sizes ) ) return 0; + v = z->huff_dc[th].values; + } + else { + if ( !stbi__build_huffman( z->huff_ac + th, sizes ) ) return 0; + v = z->huff_ac[th].values; + } + for ( i = 0; i < n; ++i ) + v[i] = stbi__get8( z->s ); + if ( tc != 0 ) + stbi__build_fast_ac( z->fast_ac[th], z->huff_ac + th ); + L -= n; + } + return L == 0; + } + + // check for comment block or APP blocks + if ( ( m >= 0xE0 && m <= 0xEF ) || m == 0xFE ) { + L = stbi__get16be( z->s ); + if ( L < 2 ) { + if ( m == 0xFE ) + return stbi__err( "bad COM len", "Corrupt JPEG" ); + else + return stbi__err( "bad APP len", "Corrupt JPEG" ); + } + L -= 2; + + if ( m == 0xE0 && L >= 5 ) { // JFIF APP0 segment + static const unsigned char tag[5] = { 'J','F','I','F','\0' }; + int ok = 1; + int i; + for ( i = 0; i < 5; ++i ) + if ( stbi__get8( z->s ) != tag[i] ) + ok = 0; + L -= 5; + if ( ok ) + z->jfif = 1; + } + else if ( m == 0xEE && L >= 12 ) { // Adobe APP14 segment + static const unsigned char tag[6] = { 'A','d','o','b','e','\0' }; + int ok = 1; + int i; + for ( i = 0; i < 6; ++i ) + if ( stbi__get8( z->s ) != tag[i] ) + ok = 0; + L -= 6; + if ( ok ) { + stbi__get8( z->s ); // version + stbi__get16be( z->s ); // flags0 + stbi__get16be( z->s ); // flags1 + z->app14_color_transform = stbi__get8( z->s ); // color transform + L -= 6; + } + } + + stbi__skip( z->s, L ); + return 1; + } + + return stbi__err( "unknown marker", "Corrupt JPEG" ); +} + +// after we see SOS +static int stbi__process_scan_header( stbi__jpeg* z ) +{ + int i; + int Ls = stbi__get16be( z->s ); + z->scan_n = stbi__get8( z->s ); + if ( z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int)z->s->img_n ) return stbi__err( "bad SOS component count", "Corrupt JPEG" ); + if ( Ls != 6 + 2 * z->scan_n ) return stbi__err( "bad SOS len", "Corrupt JPEG" ); + for ( i = 0; i < z->scan_n; ++i ) { + int id = stbi__get8( z->s ), which; + int q = stbi__get8( z->s ); + for ( which = 0; which < z->s->img_n; ++which ) + if ( z->img_comp[which].id == id ) + break; + if ( which == z->s->img_n ) return 0; // no match + z->img_comp[which].hd = q >> 4; if ( z->img_comp[which].hd > 3 ) return stbi__err( "bad DC huff", "Corrupt JPEG" ); + z->img_comp[which].ha = q & 15; if ( z->img_comp[which].ha > 3 ) return stbi__err( "bad AC huff", "Corrupt JPEG" ); + z->order[i] = which; + } + + { + int aa; + z->spec_start = stbi__get8( z->s ); + z->spec_end = stbi__get8( z->s ); // should be 63, but might be 0 + aa = stbi__get8( z->s ); + z->succ_high = ( aa >> 4 ); + z->succ_low = ( aa & 15 ); + if ( z->progressive ) { + if ( z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13 ) + return stbi__err( "bad SOS", "Corrupt JPEG" ); + } + else { + if ( z->spec_start != 0 ) return stbi__err( "bad SOS", "Corrupt JPEG" ); + if ( z->succ_high != 0 || z->succ_low != 0 ) return stbi__err( "bad SOS", "Corrupt JPEG" ); + z->spec_end = 63; + } + } + + return 1; +} + +static int stbi__free_jpeg_components( stbi__jpeg* z, int ncomp, int why ) +{ + int i; + for ( i = 0; i < ncomp; ++i ) { + if ( z->img_comp[i].raw_data ) { + STBI_FREE( z->img_comp[i].raw_data ); + z->img_comp[i].raw_data = NULL; + z->img_comp[i].data = NULL; + } + if ( z->img_comp[i].raw_coeff ) { + STBI_FREE( z->img_comp[i].raw_coeff ); + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].coeff = 0; + } + if ( z->img_comp[i].linebuf ) { + STBI_FREE( z->img_comp[i].linebuf ); + z->img_comp[i].linebuf = NULL; + } + } + return why; +} + +static int stbi__process_frame_header( stbi__jpeg* z, int scan ) +{ + stbi__context* s = z->s; + int Lf, p, i, q, h_max = 1, v_max = 1, c; + Lf = stbi__get16be( s ); if ( Lf < 11 ) return stbi__err( "bad SOF len", "Corrupt JPEG" ); // JPEG + p = stbi__get8( s ); if ( p != 8 ) return stbi__err( "only 8-bit", "JPEG format not supported: 8-bit only" ); // JPEG baseline + s->img_y = stbi__get16be( s ); if ( s->img_y == 0 ) return stbi__err( "no header height", "JPEG format not supported: delayed height" ); // Legal, but we don't handle it--but neither does IJG + s->img_x = stbi__get16be( s ); if ( s->img_x == 0 ) return stbi__err( "0 width", "Corrupt JPEG" ); // JPEG requires + c = stbi__get8( s ); + if ( c != 3 && c != 1 && c != 4 ) return stbi__err( "bad component count", "Corrupt JPEG" ); + s->img_n = c; + for ( i = 0; i < c; ++i ) { + z->img_comp[i].data = NULL; + z->img_comp[i].linebuf = NULL; + } + + if ( Lf != 8 + 3 * s->img_n ) return stbi__err( "bad SOF len", "Corrupt JPEG" ); + + z->rgb = 0; + for ( i = 0; i < s->img_n; ++i ) { + static const unsigned char rgb[3] = { 'R', 'G', 'B' }; + z->img_comp[i].id = stbi__get8( s ); + if ( s->img_n == 3 && z->img_comp[i].id == rgb[i] ) + ++z->rgb; + q = stbi__get8( s ); + z->img_comp[i].h = ( q >> 4 ); if ( !z->img_comp[i].h || z->img_comp[i].h > 4 ) return stbi__err( "bad H", "Corrupt JPEG" ); + z->img_comp[i].v = q & 15; if ( !z->img_comp[i].v || z->img_comp[i].v > 4 ) return stbi__err( "bad V", "Corrupt JPEG" ); + z->img_comp[i].tq = stbi__get8( s ); if ( z->img_comp[i].tq > 3 ) return stbi__err( "bad TQ", "Corrupt JPEG" ); + } + + if ( scan != STBI__SCAN_load ) return 1; + + if ( !stbi__mad3sizes_valid( s->img_x, s->img_y, s->img_n, 0 ) ) return stbi__err( "too large", "Image too large to decode" ); + + for ( i = 0; i < s->img_n; ++i ) { + if ( z->img_comp[i].h > h_max ) h_max = z->img_comp[i].h; + if ( z->img_comp[i].v > v_max ) v_max = z->img_comp[i].v; + } + + // compute interleaved mcu info + z->img_h_max = h_max; + z->img_v_max = v_max; + z->img_mcu_w = h_max * 8; + z->img_mcu_h = v_max * 8; + // these sizes can't be more than 17 bits + z->img_mcu_x = ( s->img_x + z->img_mcu_w - 1 ) / z->img_mcu_w; + z->img_mcu_y = ( s->img_y + z->img_mcu_h - 1 ) / z->img_mcu_h; + + for ( i = 0; i < s->img_n; ++i ) { + // number of effective pixels (e.g. for non-interleaved MCU) + z->img_comp[i].x = ( s->img_x * z->img_comp[i].h + h_max - 1 ) / h_max; + z->img_comp[i].y = ( s->img_y * z->img_comp[i].v + v_max - 1 ) / v_max; + // to simplify generation, we'll allocate enough memory to decode + // the bogus oversized data from using interleaved MCUs and their + // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't + // discard the extra data until colorspace conversion + // + // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) + // so these muls can't overflow with 32-bit ints (which we require) + z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; + z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; + z->img_comp[i].coeff = 0; + z->img_comp[i].raw_coeff = 0; + z->img_comp[i].linebuf = NULL; + z->img_comp[i].raw_data = stbi__malloc_mad2( z->img_comp[i].w2, z->img_comp[i].h2, 15 ); + if ( z->img_comp[i].raw_data == NULL ) + return stbi__free_jpeg_components( z, i + 1, stbi__err( "outofmem", "Out of memory" ) ); + // align blocks for idct using mmx/sse + z->img_comp[i].data = (stbi_uc*)( ( (size_t)z->img_comp[i].raw_data + 15 ) & ~15 ); + if ( z->progressive ) { + // w2, h2 are multiples of 8 (see above) + z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; + z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; + z->img_comp[i].raw_coeff = stbi__malloc_mad3( z->img_comp[i].w2, z->img_comp[i].h2, sizeof( short ), 15 ); + if ( z->img_comp[i].raw_coeff == NULL ) + return stbi__free_jpeg_components( z, i + 1, stbi__err( "outofmem", "Out of memory" ) ); + z->img_comp[i].coeff = (short*)( ( (size_t)z->img_comp[i].raw_coeff + 15 ) & ~15 ); + } + } + + return 1; +} + +// use comparisons since in some cases we handle more than one case (e.g. SOF) +#define stbi__DNL(x) ((x) == 0xdc) +#define stbi__SOI(x) ((x) == 0xd8) +#define stbi__EOI(x) ((x) == 0xd9) +#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) +#define stbi__SOS(x) ((x) == 0xda) + +#define stbi__SOF_progressive(x) ((x) == 0xc2) + +static int stbi__decode_jpeg_header( stbi__jpeg* z, int scan ) +{ + int m; + z->jfif = 0; + z->app14_color_transform = -1; // valid values are 0,1,2 + z->marker = STBI__MARKER_none; // initialize cached marker to empty + m = stbi__get_marker( z ); + if ( !stbi__SOI( m ) ) return stbi__err( "no SOI", "Corrupt JPEG" ); + if ( scan == STBI__SCAN_type ) return 1; + m = stbi__get_marker( z ); + while ( !stbi__SOF( m ) ) { + if ( !stbi__process_marker( z, m ) ) return 0; + m = stbi__get_marker( z ); + while ( m == STBI__MARKER_none ) { + // some files have extra padding after their blocks, so ok, we'll scan + if ( stbi__at_eof( z->s ) ) return stbi__err( "no SOF", "Corrupt JPEG" ); + m = stbi__get_marker( z ); + } + } + z->progressive = stbi__SOF_progressive( m ); + if ( !stbi__process_frame_header( z, scan ) ) return 0; + return 1; +} + +// 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; + } + } + // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 + } + } + else if ( stbi__DNL( m ) ) { + int Ld = stbi__get16be( j->s ); + stbi__uint32 NL = stbi__get16be( j->s ); + if ( Ld != 4 ) return stbi__err( "bad DNL len", "Corrupt JPEG" ); + if ( NL != j->s->img_y ) return stbi__err( "bad DNL height", "Corrupt JPEG" ); + } + 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; +} + +// this is a reduced-precision calculation of YCbCr-to-RGB introduced +// to make sure the code produces the same results in both SIMD and scalar +#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) +static void stbi__YCbCr_to_RGB_row( stbi_uc* out, const stbi_uc* y, const stbi_uc* pcb, const stbi_uc* pcr, int count, int step ) +{ + int i; + for ( i = 0; i < count; ++i ) { + int y_fixed = ( y[i] << 20 ) + ( 1 << 19 ); // rounding + int r, g, b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr * stbi__float2fixed( 1.40200f ); + g = y_fixed + ( cr * -stbi__float2fixed( 0.71414f ) ) + ( ( cb * -stbi__float2fixed( 0.34414f ) ) & 0xffff0000 ); + b = y_fixed + cb * stbi__float2fixed( 1.77200f ); + r >>= 20; + g >>= 20; + b >>= 20; + if ( (unsigned)r > 255 ) { if ( r < 0 ) r = 0; else r = 255; } + if ( (unsigned)g > 255 ) { if ( g < 0 ) g = 0; else g = 255; } + if ( (unsigned)b > 255 ) { if ( b < 0 ) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} + +#if defined(STBI_SSE2) || defined(STBI_NEON) +static void stbi__YCbCr_to_RGB_simd( stbi_uc* out, stbi_uc const* y, stbi_uc const* pcb, stbi_uc const* pcr, int count, int step ) +{ + int i = 0; + +#ifdef STBI_SSE2 + // step == 3 is pretty ugly on the final interleave, and i'm not convinced + // it's useful in practice (you wouldn't use it for textures, for example). + // so just accelerate step == 4 case. + if ( step == 4 ) { + // this is a fairly straightforward implementation and not super-optimized. + __m128i signflip = _mm_set1_epi8( -0x80 ); + __m128i cr_const0 = _mm_set1_epi16( (short)( 1.40200f * 4096.0f + 0.5f ) ); + __m128i cr_const1 = _mm_set1_epi16( -(short)( 0.71414f * 4096.0f + 0.5f ) ); + __m128i cb_const0 = _mm_set1_epi16( -(short)( 0.34414f * 4096.0f + 0.5f ) ); + __m128i cb_const1 = _mm_set1_epi16( (short)( 1.77200f * 4096.0f + 0.5f ) ); + __m128i y_bias = _mm_set1_epi8( (char)(unsigned char)128 ); + __m128i xw = _mm_set1_epi16( 255 ); // alpha channel + + for ( ; i + 7 < count; i += 8 ) { + // load + __m128i y_bytes = _mm_loadl_epi64( ( __m128i* ) ( y + i ) ); + __m128i cr_bytes = _mm_loadl_epi64( ( __m128i* ) ( pcr + i ) ); + __m128i cb_bytes = _mm_loadl_epi64( ( __m128i* ) ( pcb + i ) ); + __m128i cr_biased = _mm_xor_si128( cr_bytes, signflip ); // -128 + __m128i cb_biased = _mm_xor_si128( cb_bytes, signflip ); // -128 + + // unpack to short (and left-shift cr, cb by 8) + __m128i yw = _mm_unpacklo_epi8( y_bias, y_bytes ); + __m128i crw = _mm_unpacklo_epi8( _mm_setzero_si128(), cr_biased ); + __m128i cbw = _mm_unpacklo_epi8( _mm_setzero_si128(), cb_biased ); + + // color transform + __m128i yws = _mm_srli_epi16( yw, 4 ); + __m128i cr0 = _mm_mulhi_epi16( cr_const0, crw ); + __m128i cb0 = _mm_mulhi_epi16( cb_const0, cbw ); + __m128i cb1 = _mm_mulhi_epi16( cbw, cb_const1 ); + __m128i cr1 = _mm_mulhi_epi16( crw, cr_const1 ); + __m128i rws = _mm_add_epi16( cr0, yws ); + __m128i gwt = _mm_add_epi16( cb0, yws ); + __m128i bws = _mm_add_epi16( yws, cb1 ); + __m128i gws = _mm_add_epi16( gwt, cr1 ); + + // descale + __m128i rw = _mm_srai_epi16( rws, 4 ); + __m128i bw = _mm_srai_epi16( bws, 4 ); + __m128i gw = _mm_srai_epi16( gws, 4 ); + + // back to byte, set up for transpose + __m128i brb = _mm_packus_epi16( rw, bw ); + __m128i gxb = _mm_packus_epi16( gw, xw ); + + // transpose to interleave channels + __m128i t0 = _mm_unpacklo_epi8( brb, gxb ); + __m128i t1 = _mm_unpackhi_epi8( brb, gxb ); + __m128i o0 = _mm_unpacklo_epi16( t0, t1 ); + __m128i o1 = _mm_unpackhi_epi16( t0, t1 ); + + // store + _mm_storeu_si128( ( __m128i* ) ( out + 0 ), o0 ); + _mm_storeu_si128( ( __m128i* ) ( out + 16 ), o1 ); + out += 32; + } + } +#endif + +#ifdef STBI_NEON + // in this version, step=3 support would be easy to add. but is there demand? + if ( step == 4 ) { + // this is a fairly straightforward implementation and not super-optimized. + uint8x8_t signflip = vdup_n_u8( 0x80 ); + int16x8_t cr_const0 = vdupq_n_s16( (short)( 1.40200f * 4096.0f + 0.5f ) ); + int16x8_t cr_const1 = vdupq_n_s16( -(short)( 0.71414f * 4096.0f + 0.5f ) ); + int16x8_t cb_const0 = vdupq_n_s16( -(short)( 0.34414f * 4096.0f + 0.5f ) ); + int16x8_t cb_const1 = vdupq_n_s16( (short)( 1.77200f * 4096.0f + 0.5f ) ); + + for ( ; i + 7 < count; i += 8 ) { + // load + uint8x8_t y_bytes = vld1_u8( y + i ); + uint8x8_t cr_bytes = vld1_u8( pcr + i ); + uint8x8_t cb_bytes = vld1_u8( pcb + i ); + int8x8_t cr_biased = vreinterpret_s8_u8( vsub_u8( cr_bytes, signflip ) ); + int8x8_t cb_biased = vreinterpret_s8_u8( vsub_u8( cb_bytes, signflip ) ); + + // expand to s16 + int16x8_t yws = vreinterpretq_s16_u16( vshll_n_u8( y_bytes, 4 ) ); + int16x8_t crw = vshll_n_s8( cr_biased, 7 ); + int16x8_t cbw = vshll_n_s8( cb_biased, 7 ); + + // color transform + int16x8_t cr0 = vqdmulhq_s16( crw, cr_const0 ); + int16x8_t cb0 = vqdmulhq_s16( cbw, cb_const0 ); + int16x8_t cr1 = vqdmulhq_s16( crw, cr_const1 ); + int16x8_t cb1 = vqdmulhq_s16( cbw, cb_const1 ); + int16x8_t rws = vaddq_s16( yws, cr0 ); + int16x8_t gws = vaddq_s16( vaddq_s16( yws, cb0 ), cr1 ); + int16x8_t bws = vaddq_s16( yws, cb1 ); + + // undo scaling, round, convert to byte + uint8x8x4_t o; + o.val[0] = vqrshrun_n_s16( rws, 4 ); + o.val[1] = vqrshrun_n_s16( gws, 4 ); + o.val[2] = vqrshrun_n_s16( bws, 4 ); + o.val[3] = vdup_n_u8( 255 ); + + // store, interleaving r/g/b/a + vst4_u8( out, o ); + out += 8 * 4; + } + } +#endif + + for ( ; i < count; ++i ) { + int y_fixed = ( y[i] << 20 ) + ( 1 << 19 ); // rounding + int r, g, b; + int cr = pcr[i] - 128; + int cb = pcb[i] - 128; + r = y_fixed + cr * stbi__float2fixed( 1.40200f ); + g = y_fixed + cr * -stbi__float2fixed( 0.71414f ) + ( ( cb * -stbi__float2fixed( 0.34414f ) ) & 0xffff0000 ); + b = y_fixed + cb * stbi__float2fixed( 1.77200f ); + r >>= 20; + g >>= 20; + b >>= 20; + if ( (unsigned)r > 255 ) { if ( r < 0 ) r = 0; else r = 255; } + if ( (unsigned)g > 255 ) { if ( g < 0 ) g = 0; else g = 255; } + if ( (unsigned)b > 255 ) { if ( b < 0 ) b = 0; else b = 255; } + out[0] = (stbi_uc)r; + out[1] = (stbi_uc)g; + out[2] = (stbi_uc)b; + out[3] = 255; + out += step; + } +} +#endif + +// set up the kernels +static void stbi__setup_jpeg( stbi__jpeg* j ) +{ + j->idct_block_kernel = stbi__idct_block; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; + +#ifdef STBI_SSE2 + if ( stbi__sse2_available() ) { + j->idct_block_kernel = stbi__idct_simd; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; + } +#endif + +#ifdef STBI_NEON + j->idct_block_kernel = stbi__idct_simd; + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; +#endif +} + +// clean up the temporary component buffers +static void stbi__cleanup_jpeg( stbi__jpeg* j ) +{ + stbi__free_jpeg_components( j, j->s->img_n, 0 ); +} + +typedef struct +{ + resample_row_func resample; + stbi_uc* line0, * line1; + int hs, vs; // expansion factor in each axis + int w_lores; // horizontal pixels pre-expansion + int ystep; // how far through vertical expansion we are + int ypos; // which pre-expansion row we're on +} stbi__resample; + +// fast 0..255 * 0..255 => 0..255 rounded multiplication +static stbi_uc stbi__blinn_8x8( stbi_uc x, stbi_uc y ) +{ + unsigned int t = x * y + 128; + return (stbi_uc)( ( t + ( t >> 8 ) ) >> 8 ); +} + +static stbi_uc* load_jpeg_image( stbi__jpeg* z, int* out_x, int* out_y, int* comp, int req_comp ) +{ + int n, decode_n, is_rgb; + z->s->img_n = 0; // make stbi__cleanup_jpeg safe + + // validate req_comp + if ( req_comp < 0 || req_comp > 4 ) return stbi__errpuc( "bad req_comp", "Internal error" ); + + // load a jpeg image from whichever source, but leave in YCbCr format + if ( !stbi__decode_jpeg_image( z ) ) { stbi__cleanup_jpeg( z ); return NULL; } + + // determine actual number of components to generate + n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1; + + is_rgb = z->s->img_n == 3 && ( z->rgb == 3 || ( z->app14_color_transform == 0 && !z->jfif ) ); + + if ( z->s->img_n == 3 && n < 3 && !is_rgb ) + decode_n = 1; + else + decode_n = z->s->img_n; + + // resample and color-convert + { + int k; + unsigned int i, j; + stbi_uc* output; + stbi_uc* coutput[4] = { NULL, NULL, NULL, NULL }; + + stbi__resample res_comp[4]; + + for ( k = 0; k < decode_n; ++k ) { + stbi__resample* r = &res_comp[k]; + + // allocate line buffer big enough for upsampling off the edges + // with upsample factor of 4 + z->img_comp[k].linebuf = (stbi_uc*)stbi__malloc( z->s->img_x + 3 ); + if ( !z->img_comp[k].linebuf ) { stbi__cleanup_jpeg( z ); return stbi__errpuc( "outofmem", "Out of memory" ); } + + r->hs = z->img_h_max / z->img_comp[k].h; + r->vs = z->img_v_max / z->img_comp[k].v; + r->ystep = r->vs >> 1; + r->w_lores = ( z->s->img_x + r->hs - 1 ) / r->hs; + r->ypos = 0; + r->line0 = r->line1 = z->img_comp[k].data; + + if ( r->hs == 1 && r->vs == 1 ) r->resample = resample_row_1; + else if ( r->hs == 1 && r->vs == 2 ) r->resample = stbi__resample_row_v_2; + else if ( r->hs == 2 && r->vs == 1 ) r->resample = stbi__resample_row_h_2; + else if ( r->hs == 2 && r->vs == 2 ) r->resample = z->resample_row_hv_2_kernel; + else r->resample = stbi__resample_row_generic; + } + + // can't error after this so, this is safe + output = (stbi_uc*)stbi__malloc_mad3( n, z->s->img_x, z->s->img_y, 1 ); + if ( !output ) { stbi__cleanup_jpeg( z ); return stbi__errpuc( "outofmem", "Out of memory" ); } + + // now go ahead and resample + for ( j = 0; j < z->s->img_y; ++j ) { + stbi_uc* out = output + n * z->s->img_x * j; + for ( k = 0; k < decode_n; ++k ) { + stbi__resample* r = &res_comp[k]; + int y_bot = r->ystep >= ( r->vs >> 1 ); + coutput[k] = r->resample( z->img_comp[k].linebuf, + y_bot ? r->line1 : r->line0, + y_bot ? r->line0 : r->line1, + r->w_lores, r->hs ); + if ( ++r->ystep >= r->vs ) { + r->ystep = 0; + r->line0 = r->line1; + if ( ++r->ypos < z->img_comp[k].y ) + r->line1 += z->img_comp[k].w2; + } + } + if ( n >= 3 ) { + stbi_uc* y = coutput[0]; + if ( z->s->img_n == 3 ) { + if ( is_rgb ) { + for ( i = 0; i < z->s->img_x; ++i ) { + out[0] = y[i]; + out[1] = coutput[1][i]; + out[2] = coutput[2][i]; + out[3] = 255; + out += n; + } + } + else { + z->YCbCr_to_RGB_kernel( out, y, coutput[1], coutput[2], z->s->img_x, n ); + } + } + else if ( z->s->img_n == 4 ) { + if ( z->app14_color_transform == 0 ) { // CMYK + for ( i = 0; i < z->s->img_x; ++i ) { + stbi_uc m = coutput[3][i]; + out[0] = stbi__blinn_8x8( coutput[0][i], m ); + out[1] = stbi__blinn_8x8( coutput[1][i], m ); + out[2] = stbi__blinn_8x8( coutput[2][i], m ); + out[3] = 255; + out += n; + } + } + else if ( z->app14_color_transform == 2 ) { // YCCK + z->YCbCr_to_RGB_kernel( out, y, coutput[1], coutput[2], z->s->img_x, n ); + for ( i = 0; i < z->s->img_x; ++i ) { + stbi_uc m = coutput[3][i]; + out[0] = stbi__blinn_8x8( 255 - out[0], m ); + out[1] = stbi__blinn_8x8( 255 - out[1], m ); + out[2] = stbi__blinn_8x8( 255 - out[2], m ); + out += n; + } + } + else { // YCbCr + alpha? Ignore the fourth channel for now + z->YCbCr_to_RGB_kernel( out, y, coutput[1], coutput[2], z->s->img_x, n ); + } + } + else + for ( i = 0; i < z->s->img_x; ++i ) { + out[0] = out[1] = out[2] = y[i]; + out[3] = 255; // not used if n==3 + out += n; + } + } + else { + if ( is_rgb ) { + if ( n == 1 ) + for ( i = 0; i < z->s->img_x; ++i ) + * out++ = stbi__compute_y( coutput[0][i], coutput[1][i], coutput[2][i] ); + else { + for ( i = 0; i < z->s->img_x; ++i, out += 2 ) { + out[0] = stbi__compute_y( coutput[0][i], coutput[1][i], coutput[2][i] ); + out[1] = 255; + } + } + } + else if ( z->s->img_n == 4 && z->app14_color_transform == 0 ) { + for ( i = 0; i < z->s->img_x; ++i ) { + stbi_uc m = coutput[3][i]; + stbi_uc r = stbi__blinn_8x8( coutput[0][i], m ); + stbi_uc g = stbi__blinn_8x8( coutput[1][i], m ); + stbi_uc b = stbi__blinn_8x8( coutput[2][i], m ); + out[0] = stbi__compute_y( r, g, b ); + out[1] = 255; + out += n; + } + } + else if ( z->s->img_n == 4 && z->app14_color_transform == 2 ) { + for ( i = 0; i < z->s->img_x; ++i ) { + out[0] = stbi__blinn_8x8( 255 - coutput[0][i], coutput[3][i] ); + out[1] = 255; + out += n; + } + } + else { + stbi_uc* y = coutput[0]; + if ( n == 1 ) + for ( i = 0; i < z->s->img_x; ++i ) out[i] = y[i]; + else + for ( i = 0; i < z->s->img_x; ++i ) { *out++ = y[i]; *out++ = 255; } + } + } + } + stbi__cleanup_jpeg( z ); + *out_x = z->s->img_x; + *out_y = z->s->img_y; + if ( comp )* comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output + return output; + } +} + +static void* stbi__jpeg_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ) +{ + unsigned char* result; + stbi__jpeg* j = (stbi__jpeg*)stbi__malloc( sizeof( stbi__jpeg ) ); + STBI_NOTUSED( ri ); + j->s = s; + stbi__setup_jpeg( j ); + result = load_jpeg_image( j, x, y, comp, req_comp ); + STBI_FREE( j ); + return result; +} + +static int stbi__jpeg_test( stbi__context* s ) +{ + int r; + stbi__jpeg* j = (stbi__jpeg*)stbi__malloc( sizeof( stbi__jpeg ) ); + j->s = s; + stbi__setup_jpeg( j ); + r = stbi__decode_jpeg_header( j, STBI__SCAN_type ); + stbi__rewind( s ); + STBI_FREE( j ); + return r; +} + +static int stbi__jpeg_info_raw( stbi__jpeg* j, int* x, int* y, int* comp ) +{ + if ( !stbi__decode_jpeg_header( j, STBI__SCAN_header ) ) { + stbi__rewind( j->s ); + return 0; + } + if ( x )* x = j->s->img_x; + if ( y )* y = j->s->img_y; + if ( comp )* comp = j->s->img_n >= 3 ? 3 : 1; + return 1; +} + +static int stbi__jpeg_info( stbi__context* s, int* x, int* y, int* comp ) +{ + int result; + stbi__jpeg* j = (stbi__jpeg*)( stbi__malloc( sizeof( stbi__jpeg ) ) ); + 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, const stbi_uc* sizelist, int num ) +{ + int i, k = 0; + int code, next_code[16], sizes[17]; + + // DEFLATE spec for generating codes + memset( sizes, 0, sizeof( sizes ) ); + memset( z->fast, 0, sizeof( z->fast ) ); + for ( i = 0; i < num; ++i ) + ++sizes[sizelist[i]]; + sizes[0] = 0; + for ( i = 1; i < 16; ++i ) + if ( sizes[i] > ( 1 << i ) ) + return stbi__err( "bad sizes", "Corrupt PNG" ); + code = 0; + for ( i = 1; i < 16; ++i ) { + next_code[i] = code; + z->firstcode[i] = (stbi__uint16)code; + z->firstsymbol[i] = (stbi__uint16)k; + code = ( code + sizes[i] ); + if ( sizes[i] ) + if ( code - 1 >= ( 1 << i ) ) return stbi__err( "bad codelengths", "Corrupt PNG" ); + z->maxcode[i] = code << ( 16 - i ); // preshift for inner loop + code <<= 1; + k += sizes[i]; + } + z->maxcode[16] = 0x10000; // sentinel + for ( i = 0; i < num; ++i ) { + int s = sizelist[i]; + if ( s ) { + int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; + stbi__uint16 fastv = (stbi__uint16)( ( s << 9 ) | i ); + z->size[c] = (stbi_uc)s; + z->value[c] = (stbi__uint16)i; + if ( s <= STBI__ZFAST_BITS ) { + int j = stbi__bit_reverse( next_code[s], s ); + while ( j < ( 1 << STBI__ZFAST_BITS ) ) { + z->fast[j] = fastv; + j += ( 1 << s ); + } + } + ++next_code[s]; + } + } + return 1; +} + +// zlib-from-memory implementation for PNG reading +// because PNG allows splitting the zlib stream arbitrarily, +// and it's annoying structurally to have PNG call ZLIB call PNG, +// we require PNG read all the IDATs and combine them into a single +// memory buffer + +typedef struct +{ + stbi_uc* zbuffer, * zbuffer_end; + int num_bits; + 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 const int stbi__zlength_base[31] = { + 3,4,5,6,7,8,9,10,11,13, + 15,17,19,23,27,31,35,43,51,59, + 67,83,99,115,131,163,195,227,258,0,0 }; + +static const int stbi__zlength_extra[31] = +{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; + +static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, +257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0 }; + +static const int stbi__zdist_extra[32] = +{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 }; + +static int stbi__parse_huffman_block( stbi__zbuf* a ) +{ + char* zout = a->zout; + for ( ;;) { + int z = stbi__zhuffman_decode( a, &a->z_length ); + if ( z < 256 ) { + if ( z < 0 ) return stbi__err( "bad huffman code", "Corrupt PNG" ); // error in huffman codes + if ( zout >= a->zout_end ) { + if ( !stbi__zexpand( a, zout, 1 ) ) return 0; + zout = a->zout; + } + *zout++ = (char)z; + } + else { + stbi_uc* p; + int len, dist; + if ( z == 256 ) { + a->zout = zout; + 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 const stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; + stbi__zhuffman z_codelength; + stbi_uc lencodes[286 + 32 + 137];//padding for maximum single op + stbi_uc codelength_sizes[19]; + int i, n; + + int hlit = stbi__zreceive( a, 5 ) + 257; + int hdist = stbi__zreceive( a, 5 ) + 1; + int hclen = stbi__zreceive( a, 4 ) + 4; + int ntot = hlit + hdist; + + memset( codelength_sizes, 0, sizeof( codelength_sizes ) ); + for ( i = 0; i < hclen; ++i ) { + int s = stbi__zreceive( a, 3 ); + codelength_sizes[length_dezigzag[i]] = (stbi_uc)s; + } + if ( !stbi__zbuild_huffman( &z_codelength, codelength_sizes, 19 ) ) return 0; + + n = 0; + while ( n < ntot ) { + int c = stbi__zhuffman_decode( a, &z_codelength ); + if ( c < 0 || c >= 19 ) return stbi__err( "bad codelengths", "Corrupt PNG" ); + if ( c < 16 ) + lencodes[n++] = (stbi_uc)c; + else { + stbi_uc fill = 0; + if ( c == 16 ) { + c = stbi__zreceive( a, 2 ) + 3; + if ( n == 0 ) return stbi__err( "bad codelengths", "Corrupt PNG" ); + fill = lencodes[n - 1]; + } + else if ( c == 17 ) + c = stbi__zreceive( a, 3 ) + 3; + else { + 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; +} + +static const stbi_uc stbi__zdefault_length[288] = +{ + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8 +}; +static const stbi_uc stbi__zdefault_distance[32] = +{ + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 +}; +/* +Init algorithm: +{ + int i; // use <= to match clearly with spec + for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; + for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; + for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; + for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; + + for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; +} +*/ + +static int stbi__parse_zlib( stbi__zbuf* a, int parse_header ) +{ + int final, type; + if ( parse_header ) + if ( !stbi__parse_zlib_header( a ) ) return 0; + a->num_bits = 0; + a->code_buffer = 0; + do { + final = stbi__zreceive( a, 1 ); + type = stbi__zreceive( a, 2 ); + if ( type == 0 ) { + if ( !stbi__parse_uncompressed_block( a ) ) return 0; + } + else if ( type == 3 ) { + return 0; + } + else { + if ( type == 1 ) { + // use fixed code lengths + if ( !stbi__zbuild_huffman( &a->z_length, stbi__zdefault_length, 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 const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; + int i; + for ( i = 0; i < 8; ++i ) + if ( stbi__get8( s ) != png_sig[i] ) return stbi__err( "bad png sig", "Not a PNG" ); + return 1; +} + +typedef struct +{ + stbi__context* s; + stbi_uc* idata, * expanded, * out; + int depth; +} stbi__png; + + +enum { + STBI__F_none = 0, + STBI__F_sub = 1, + STBI__F_up = 2, + STBI__F_avg = 3, + STBI__F_paeth = 4, + // synthetic 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 const 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" ); + + if ( !stbi__mad3sizes_valid( img_n, x, depth, 7 ) ) return stbi__err( "too large", "Corrupt PNG" ); + img_width_bytes = ( ( ( img_n * x * depth ) + 7 ) >> 3 ); + img_len = ( img_width_bytes + 1 ) * y; + + // we used to check for exact match between raw_len and img_len on non-interlaced PNGs, + // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros), + // so just check for raw_len < img_len always. + if ( raw_len < img_len ) return stbi__err( "not enough pixels", "Corrupt PNG" ); + + for ( j = 0; j < y; ++j ) { + stbi_uc* cur = a->out + stride * j; + stbi_uc* prior; + 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; + } + prior = cur - stride; // bugfix: need to compute this after 'cur +=' computation above + + // 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 ) { + stbi_uc half = a / 2; + p[0] = ( p[2] * 255 + half ) / a; + p[1] = ( p[1] * 255 + half ) / a; + p[2] = ( t * 255 + half ) / a; + } + else { + p[0] = p[2]; + p[2] = t; + } + p += 4; + } + } + else { + // convert bgr to rgb + for ( i = 0; i < pixel_count; ++i ) { + stbi_uc t = p[0]; + p[0] = p[2]; + p[2] = t; + p += 4; + } + } + } +} + +#define STBI__PNG_TYPE(a,b,c,d) (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d)) + +static int stbi__parse_png_file( stbi__png* z, int scan, int req_comp ) +{ + stbi_uc palette[1024], pal_img_n = 0; + stbi_uc has_trans = 0, tc[3] = { 0 }; + stbi__uint16 tc16[3]; + stbi__uint32 ioff = 0, idata_limit = 0, i, pal_len = 0; + int first = 1, k, interlace = 0, color = 0, is_iphone = 0; + stbi__context* s = z->s; + + z->expanded = NULL; + z->idata = NULL; + z->out = NULL; + + if ( !stbi__check_png_header( s ) ) return 0; + + if ( scan == STBI__SCAN_type ) return 1; + + for ( ;;) { + stbi__pngchunk c = stbi__get_chunk_header( s ); + switch ( c.type ) { + case STBI__PNG_TYPE( 'C', 'g', 'B', 'I' ): + is_iphone = 1; + stbi__skip( s, c.length ); + break; + case STBI__PNG_TYPE( 'I', 'H', 'D', 'R' ): { + int comp, filter; + if ( !first ) return stbi__err( "multiple IHDR", "Corrupt PNG" ); + first = 0; + if ( c.length != 13 ) return stbi__err( "bad IHDR len", "Corrupt PNG" ); + s->img_x = stbi__get32be( s ); 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; + } + else if ( has_trans ) { + // non-paletted image with tRNS -> source image has (constant) alpha + ++s->img_n; + } + 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 ); +} + +static int stbi__png_is16( stbi__context* s ) +{ + stbi__png p; + p.s = s; + if ( !stbi__png_info_raw( &p, NULL, NULL, NULL ) ) + return 0; + if ( p.depth != 16 ) { + stbi__rewind( p.s ); + return 0; + } + return 1; +} +#endif + +// Microsoft/Windows BMP image + +#ifndef STBI_NO_BMP +static int stbi__bmp_test_raw( stbi__context* s ) +{ + int r; + int sz; + if ( stbi__get8( s ) != 'B' ) return 0; + if ( stbi__get8( s ) != 'M' ) return 0; + stbi__get32le( s ); // discard filesize + stbi__get16le( s ); // discard reserved + stbi__get16le( s ); // discard reserved + stbi__get32le( s ); // discard data offset + sz = stbi__get32le( s ); + r = ( sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124 ); + return r; +} + +static int stbi__bmp_test( stbi__context* s ) +{ + int r = stbi__bmp_test_raw( s ); + stbi__rewind( s ); + return r; +} + + +// returns 0..31 for the highest set bit +static int stbi__high_bit( unsigned int z ) +{ + int n = 0; + if ( z == 0 ) return -1; + if ( z >= 0x10000 ) { n += 16; z >>= 16; } + if ( z >= 0x00100 ) { n += 8; z >>= 8; } + if ( z >= 0x00010 ) { n += 4; z >>= 4; } + if ( z >= 0x00004 ) { n += 2; z >>= 2; } + if ( z >= 0x00002 ) { n += 1;/* >>= 1;*/ } + return n; +} + +static int stbi__bitcount( unsigned int a ) +{ + a = ( a & 0x55555555 ) + ( ( a >> 1 ) & 0x55555555 ); // max 2 + a = ( a & 0x33333333 ) + ( ( a >> 2 ) & 0x33333333 ); // max 4 + a = ( a + ( a >> 4 ) ) & 0x0f0f0f0f; // max 8 per 4, now 8 bits + a = ( a + ( a >> 8 ) ); // max 16 per 8 bits + a = ( a + ( a >> 16 ) ); // max 32 per 8 bits + return a & 0xff; +} + +// extract an arbitrarily-aligned N-bit value (N=bits) +// from v, and then make it 8-bits long and fractionally +// extend it to full full range. +static int stbi__shiftsigned( unsigned int v, int shift, int bits ) +{ + static unsigned int mul_table[9] = { + 0, + 0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/, + 0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/, + }; + static unsigned int shift_table[9] = { + 0, 0,0,1,0,2,4,6,0, + }; + if ( shift < 0 ) + v <<= -shift; + else + v >>= shift; + STBI_ASSERT( v >= 0 && v < 256 ); + v >>= ( 8 - bits ); + STBI_ASSERT( bits >= 0 && bits <= 8 ); + return (int)( (unsigned)v * mul_table[bits] ) >> shift_table[bits]; +} + +typedef struct +{ + int bpp, offset, hsz; + unsigned int mr, mg, mb, ma, all_a; +} 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 ( 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; + } + + if ( info.bpp == 24 && ma == 0xff000000 ) + s->img_n = 3; + else + s->img_n = ma ? 4 : 3; + if ( req_comp && req_comp >= 3 ) // we can directly decode 3 or 4 + target = req_comp; + else + target = s->img_n; // if they want monochrome, we'll post-convert + + // sanity-check size + if ( !stbi__mad3sizes_valid( target, s->img_x, s->img_y, 0 ) ) + return stbi__errpuc( "too large", "Corrupt BMP" ); + + out = (stbi_uc*)stbi__malloc_mad3( target, s->img_x, s->img_y, 0 ); + if ( !out ) return stbi__errpuc( "outofmem", "Out of memory" ); + if ( info.bpp < 16 ) { + int z = 0; + if ( psize == 0 || psize > 256 ) { STBI_FREE( out ); return stbi__errpuc( "invalid", "Corrupt BMP" ); } + for ( i = 0; i < psize; ++i ) { + pal[i][2] = stbi__get8( s ); + pal[i][1] = stbi__get8( s ); + pal[i][0] = stbi__get8( s ); + if ( info.hsz != 12 ) stbi__get8( s ); + pal[i][3] = 255; + } + stbi__skip( s, info.offset - 14 - info.hsz - psize * ( info.hsz == 12 ? 3 : 4 ) ); + if ( info.bpp == 1 ) width = ( s->img_x + 7 ) >> 3; + else if ( info.bpp == 4 ) width = ( s->img_x + 1 ) >> 1; + else if ( info.bpp == 8 ) width = s->img_x; + else { STBI_FREE( out ); return stbi__errpuc( "bad bpp", "Corrupt BMP" ); } + pad = ( -width ) & 3; + if ( info.bpp == 1 ) { + for ( j = 0; j < (int)s->img_y; ++j ) { + int bit_offset = 7, v = stbi__get8( s ); + for ( i = 0; i < (int)s->img_x; ++i ) { + int color = ( v >> bit_offset ) & 0x1; + out[z++] = pal[color][0]; + out[z++] = pal[color][1]; + out[z++] = pal[color][2]; + if ( target == 4 ) out[z++] = 255; + if ( i + 1 == (int)s->img_x ) break; + if ( ( --bit_offset ) < 0 ) { + bit_offset = 7; + v = stbi__get8( s ); + } + } + stbi__skip( s, pad ); + } + } + else { + for ( j = 0; j < (int)s->img_y; ++j ) { + for ( i = 0; i < (int)s->img_x; i += 2 ) { + int v = stbi__get8( s ), v2 = 0; + if ( info.bpp == 4 ) { + v2 = v & 15; + v >>= 4; + } + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if ( target == 4 ) out[z++] = 255; + if ( i + 1 == (int)s->img_x ) break; + v = ( info.bpp == 8 ) ? stbi__get8( s ) : v2; + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if ( target == 4 ) out[z++] = 255; + } + stbi__skip( s, pad ); + } + } + } + else { + int rshift = 0, gshift = 0, bshift = 0, ashift = 0, rcount = 0, gcount = 0, bcount = 0, acount = 0; + int z = 0; + int easy = 0; + stbi__skip( s, info.offset - 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 ) ); + unsigned int a; + out[z++] = STBI__BYTECAST( stbi__shiftsigned( v & mr, rshift, rcount ) ); + out[z++] = STBI__BYTECAST( stbi__shiftsigned( v & mg, gshift, gcount ) ); + out[z++] = STBI__BYTECAST( stbi__shiftsigned( v & mb, bshift, bcount ) ); + a = ( ma ? stbi__shiftsigned( v & ma, ashift, acount ) : 255 ); + all_a |= a; + if ( target == 4 ) out[z++] = STBI__BYTECAST( a ); + } + } + stbi__skip( s, pad ); + } + } + + // if alpha channel is all 0s, replace with all 255s + if ( target == 4 && all_a == 0 ) + for ( i = 4 * s->img_x * s->img_y - 1; i >= 0; i -= 4 ) + out[i] = 255; + + if ( flip_vertically ) { + stbi_uc t; + for ( j = 0; j < (int)s->img_y >> 1; ++j ) { + stbi_uc* p1 = out + j * s->img_x * target; + stbi_uc* p2 = out + ( s->img_y - 1 - j ) * s->img_x * target; + for ( i = 0; i < (int)s->img_x * target; ++i ) { + t = p1[i]; p1[i] = p2[i]; p2[i] = t; + } + } + } + + if ( req_comp && req_comp != target ) { + out = stbi__convert_format( out, target, req_comp, s->img_x, s->img_y ); + if ( out == NULL ) return out; // stbi__convert_format frees input on failure + } + + *x = s->img_x; + *y = s->img_y; + if ( comp )* comp = s->img_n; + return out; +} +#endif + +// Targa Truevision - TGA +// by Jonathan Dummer +#ifndef STBI_NO_TGA +// returns STBI_rgb or whatever, 0 on error +static int stbi__tga_get_comp( int bits_per_pixel, int is_grey, int* is_rgb16 ) +{ + // only RGB or RGBA (incl. 16bit) or grey allowed + if ( is_rgb16 )* is_rgb16 = 0; + switch ( bits_per_pixel ) { + case 8: return STBI_grey; + case 16: if ( is_grey ) return STBI_grey_alpha; + // fallthrough + case 15: if ( is_rgb16 ) * is_rgb16 = 1; + return STBI_rgb; + case 24: // fallthrough + case 32: return bits_per_pixel / 8; + default: return 0; + } +} + +static int stbi__tga_info( stbi__context* s, int* x, int* y, int* comp ) +{ + int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; + int sz, tga_colormap_type; + stbi__get8( s ); // discard Offset + tga_colormap_type = stbi__get8( s ); // colormap type + if ( tga_colormap_type > 1 ) { + stbi__rewind( s ); + return 0; // only RGB or indexed allowed + } + tga_image_type = stbi__get8( s ); // image type + if ( tga_colormap_type == 1 ) { // colormapped (paletted) image + if ( tga_image_type != 1 && tga_image_type != 9 ) { + stbi__rewind( s ); + return 0; + } + stbi__skip( s, 4 ); // skip index of first colormap entry and number of entries + sz = stbi__get8( s ); // check bits per palette color entry + if ( ( sz != 8 ) && ( sz != 15 ) && ( sz != 16 ) && ( sz != 24 ) && ( sz != 32 ) ) { + stbi__rewind( s ); + return 0; + } + stbi__skip( s, 4 ); // skip image x and y origin + tga_colormap_bpp = sz; + } + else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE + if ( ( tga_image_type != 2 ) && ( tga_image_type != 3 ) && ( tga_image_type != 10 ) && ( tga_image_type != 11 ) ) { + stbi__rewind( s ); + return 0; // only RGB or grey allowed, +/- RLE + } + stbi__skip( s, 9 ); // skip colormap specification and image x/y origin + tga_colormap_bpp = 0; + } + tga_w = stbi__get16le( s ); + if ( tga_w < 1 ) { + stbi__rewind( s ); + return 0; // test width + } + tga_h = stbi__get16le( s ); + if ( tga_h < 1 ) { + stbi__rewind( s ); + return 0; // test height + } + tga_bits_per_pixel = stbi__get8( s ); // bits per pixel + stbi__get8( s ); // ignore alpha bits + if ( tga_colormap_bpp != 0 ) { + if ( ( tga_bits_per_pixel != 8 ) && ( tga_bits_per_pixel != 16 ) ) { + // when using a colormap, tga_bits_per_pixel is the size of the indexes + // I don't think anything but 8 or 16bit indexes makes sense + stbi__rewind( s ); + return 0; + } + tga_comp = stbi__tga_get_comp( tga_colormap_bpp, 0, NULL ); + } + else { + tga_comp = stbi__tga_get_comp( tga_bits_per_pixel, ( tga_image_type == 3 ) || ( tga_image_type == 11 ), NULL ); + } + if ( !tga_comp ) { + stbi__rewind( s ); + return 0; + } + if ( x )* x = tga_w; + if ( y )* y = tga_h; + if ( comp )* comp = tga_comp; + return 1; // seems to have passed everything +} + +static int stbi__tga_test( stbi__context* s ) +{ + int res = 0; + int sz, tga_color_type; + stbi__get8( s ); // discard Offset + tga_color_type = stbi__get8( s ); // color type + if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed + sz = stbi__get8( s ); // image type + if ( tga_color_type == 1 ) { // colormapped (paletted) image + if ( sz != 1 && sz != 9 ) goto errorEnd; // colortype 1 demands image type 1 or 9 + stbi__skip( s, 4 ); // skip index of first colormap entry and number of entries + sz = stbi__get8( s ); // check bits per palette color entry + if ( ( sz != 8 ) && ( sz != 15 ) && ( sz != 16 ) && ( sz != 24 ) && ( sz != 32 ) ) goto errorEnd; + stbi__skip( s, 4 ); // skip image x and y origin + } + else { // "normal" image w/o colormap + if ( ( sz != 2 ) && ( sz != 3 ) && ( sz != 10 ) && ( sz != 11 ) ) goto errorEnd; // only RGB or grey allowed, +/- RLE + stbi__skip( s, 9 ); // skip colormap specification and image x/y origin + } + if ( stbi__get16le( s ) < 1 ) goto errorEnd; // test width + if ( stbi__get16le( s ) < 1 ) goto errorEnd; // test height + sz = stbi__get8( s ); // bits per pixel + if ( ( tga_color_type == 1 ) && ( sz != 8 ) && ( sz != 16 ) ) goto errorEnd; // for colormapped images, bpp is size of an index + if ( ( sz != 8 ) && ( sz != 15 ) && ( sz != 16 ) && ( sz != 24 ) && ( sz != 32 ) ) goto errorEnd; + + res = 1; // if we got this far, everything's good and we can return 1 instead of 0 + +errorEnd: + stbi__rewind( s ); + return res; +} + +// read 16bit value and convert to 24bit RGB +static void stbi__tga_read_rgb16( stbi__context* s, stbi_uc* out ) +{ + stbi__uint16 px = (stbi__uint16)stbi__get16le( s ); + stbi__uint16 fiveBitMask = 31; + // we have 3 channels with 5bits each + int r = ( px >> 10 ) & fiveBitMask; + int g = ( px >> 5 ) & fiveBitMask; + int b = px & fiveBitMask; + // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later + out[0] = (stbi_uc)( ( r * 255 ) / 31 ); + out[1] = (stbi_uc)( ( g * 255 ) / 31 ); + out[2] = (stbi_uc)( ( b * 255 ) / 31 ); + + // some people claim that the most significant bit might be used for alpha + // (possibly if an alpha-bit is set in the "image descriptor byte") + // but that only made 16bit test images completely translucent.. + // so let's treat all 15 and 16bit TGAs as RGB with no alpha. +} + +static void* stbi__tga_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ) +{ + // read in the TGA header stuff + int tga_offset = stbi__get8( s ); + int tga_indexed = stbi__get8( s ); + int tga_image_type = stbi__get8( s ); + int tga_is_RLE = 0; + int tga_palette_start = stbi__get16le( s ); + int tga_palette_len = stbi__get16le( s ); + int tga_palette_bits = stbi__get8( s ); + int tga_x_origin = stbi__get16le( s ); + int tga_y_origin = stbi__get16le( s ); + int tga_width = stbi__get16le( s ); + int tga_height = stbi__get16le( s ); + int tga_bits_per_pixel = stbi__get8( s ); + int tga_comp, tga_rgb16 = 0; + int tga_inverted = stbi__get8( s ); + // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) + // image data + unsigned char* tga_data; + unsigned char* tga_palette = NULL; + int i, j; + unsigned char raw_data[4] = { 0 }; + int RLE_count = 0; + int RLE_repeating = 0; + int read_next_pixel = 1; + STBI_NOTUSED( ri ); + STBI_NOTUSED( tga_x_origin ); // @TODO + STBI_NOTUSED( tga_y_origin ); // @TODO + + // 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; + STBI_NOTUSED( tga_palette_start ); + // OK, done + return tga_data; +} +#endif + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB + +#ifndef STBI_NO_PSD +static int stbi__psd_test( stbi__context* s ) +{ + int r = ( stbi__get32be( s ) == 0x38425053 ); + stbi__rewind( s ); + return r; +} + +static int stbi__psd_decode_rle( stbi__context* s, stbi_uc* p, int pixelCount ) +{ + int count, nleft, len; + + count = 0; + while ( ( nleft = pixelCount - count ) > 0 ) { + len = stbi__get8( s ); + if ( len == 128 ) { + // No-op. + } + else if ( len < 128 ) { + // Copy next len+1 bytes literally. + len++; + if ( len > nleft ) return 0; // corrupt data + count += len; + while ( len ) { + *p = stbi__get8( s ); + p += 4; + len--; + } + } + else if ( len > 128 ) { + stbi_uc val; + // Next -len+1 bytes in the dest are replicated from next source byte. + // (Interpret len as a negative 8-bit int.) + len = 257 - len; + if ( len > nleft ) return 0; // corrupt data + val = stbi__get8( s ); + count += len; + while ( len ) { + *p = val; + p += 4; + len--; + } + } + } + + return 1; +} + +static void* stbi__psd_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri, int bpc ) +{ + int pixelCount; + int channelCount, compression; + int channel, i; + int bitdepth; + int w, h; + stbi_uc* out; + STBI_NOTUSED( ri ); + + // Check identifier + if ( stbi__get32be( s ) != 0x38425053 ) // "8BPS" + return stbi__errpuc( "not PSD", "Corrupt PSD image" ); + + // Check file type version. + if ( stbi__get16be( s ) != 1 ) + return stbi__errpuc( "wrong version", "Unsupported version of PSD image" ); + + // Skip 6 reserved bytes. + stbi__skip( s, 6 ); + + // Read the number of channels (R, G, B, A, etc). + channelCount = stbi__get16be( s ); + if ( channelCount < 0 || channelCount > 16 ) + return stbi__errpuc( "wrong channel count", "Unsupported number of channels in PSD image" ); + + // Read the rows and columns of the image. + h = stbi__get32be( s ); + w = stbi__get32be( s ); + + // Make sure the depth is 8 bits. + bitdepth = stbi__get16be( s ); + if ( bitdepth != 8 && bitdepth != 16 ) + return stbi__errpuc( "unsupported bit depth", "PSD bit depth is not 8 or 16 bit" ); + + // Make sure the color mode is RGB. + // Valid options are: + // 0: Bitmap + // 1: Grayscale + // 2: Indexed color + // 3: RGB color + // 4: CMYK color + // 7: Multichannel + // 8: Duotone + // 9: Lab color + if ( stbi__get16be( s ) != 3 ) + return stbi__errpuc( "wrong color format", "PSD is not in RGB color format" ); + + // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) + stbi__skip( s, stbi__get32be( s ) ); + + // Skip the image resources. (resolution, pen tool paths, etc) + stbi__skip( s, stbi__get32be( s ) ); + + // Skip the reserved data. + stbi__skip( s, stbi__get32be( s ) ); + + // Find out if the data is compressed. + // Known values: + // 0: no compression + // 1: RLE compressed + compression = stbi__get16be( s ); + if ( compression > 1 ) + return stbi__errpuc( "bad compression", "PSD has an unknown compression format" ); + + // Check size + if ( !stbi__mad3sizes_valid( 4, w, h, 0 ) ) + return stbi__errpuc( "too large", "Corrupt PSD" ); + + // Create the destination image. + + if ( !compression && bitdepth == 16 && bpc == 16 ) { + out = (stbi_uc*)stbi__malloc_mad3( 8, w, h, 0 ); + ri->bits_per_channel = 16; + } + else + out = (stbi_uc*)stbi__malloc( 4 * w * h ); + + if ( !out ) return stbi__errpuc( "outofmem", "Out of memory" ); + pixelCount = w * h; + + // Initialize the data to zero. + //memset( out, 0, pixelCount * 4 ); + + // Finally, the image data. + if ( compression ) { + // RLE as used by .PSD and .TIFF + // Loop until you get the number of unpacked bytes you are expecting: + // Read the next source byte into n. + // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. + // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. + // Else if n is 128, noop. + // Endloop + + // The RLE-compressed data is preceded by a 2-byte data count for each row in the data, + // which we're going to just skip. + stbi__skip( s, h * channelCount * 2 ); + + // Read the RLE data by channel. + for ( channel = 0; channel < 4; channel++ ) { + stbi_uc* p; + + p = out + channel; + if ( channel >= channelCount ) { + // Fill this channel with default data. + for ( i = 0; i < pixelCount; i++, p += 4 ) + * p = ( channel == 3 ? 255 : 0 ); + } + else { + // Read the RLE data. + if ( !stbi__psd_decode_rle( s, p, pixelCount ) ) { + STBI_FREE( out ); + return stbi__errpuc( "corrupt", "bad RLE data" ); + } + } + } + + } + else { + // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) + // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image. + + // Read the data by channel. + for ( channel = 0; channel < 4; channel++ ) { + if ( channel >= channelCount ) { + // Fill this channel with default data. + if ( bitdepth == 16 && bpc == 16 ) { + stbi__uint16* q = ( (stbi__uint16*)out ) + channel; + stbi__uint16 val = channel == 3 ? 65535 : 0; + for ( i = 0; i < pixelCount; i++, q += 4 ) + * q = val; + } + else { + stbi_uc* p = out + channel; + stbi_uc val = channel == 3 ? 255 : 0; + for ( i = 0; i < pixelCount; i++, p += 4 ) + * p = val; + } + } + else { + if ( ri->bits_per_channel == 16 ) { // output bpc + stbi__uint16* q = ( (stbi__uint16*)out ) + channel; + for ( i = 0; i < pixelCount; i++, q += 4 ) + * q = (stbi__uint16)stbi__get16be( s ); + } + else { + stbi_uc* p = out + channel; + if ( bitdepth == 16 ) { // input bpc + for ( i = 0; i < pixelCount; i++, p += 4 ) + * p = (stbi_uc)( stbi__get16be( s ) >> 8 ); + } + else { + for ( i = 0; i < pixelCount; i++, p += 4 ) + * p = stbi__get8( s ); + } + } + } + } + } + + // remove weird white matte from PSD + if ( channelCount >= 4 ) { + if ( ri->bits_per_channel == 16 ) { + for ( i = 0; i < w * h; ++i ) { + stbi__uint16* pixel = (stbi__uint16*)out + 4 * i; + if ( pixel[3] != 0 && pixel[3] != 65535 ) { + float a = pixel[3] / 65535.0f; + float ra = 1.0f / a; + float inv_a = 65535.0f * ( 1 - ra ); + pixel[0] = (stbi__uint16)( pixel[0] * ra + inv_a ); + pixel[1] = (stbi__uint16)( pixel[1] * ra + inv_a ); + pixel[2] = (stbi__uint16)( pixel[2] * ra + inv_a ); + } + } + } + else { + for ( i = 0; i < w * h; ++i ) { + unsigned char* pixel = out + 4 * i; + if ( pixel[3] != 0 && pixel[3] != 255 ) { + float a = pixel[3] / 255.0f; + float ra = 1.0f / a; + float inv_a = 255.0f * ( 1 - ra ); + pixel[0] = (unsigned char)( pixel[0] * ra + inv_a ); + pixel[1] = (unsigned char)( pixel[1] * ra + inv_a ); + pixel[2] = (unsigned char)( pixel[2] * ra + inv_a ); + } + } + } + } + + // convert to desired output format + if ( req_comp && req_comp != 4 ) { + if ( ri->bits_per_channel == 16 ) + out = (stbi_uc*)stbi__convert_format16( (stbi__uint16*)out, 4, req_comp, w, h ); + else + out = stbi__convert_format( out, 4, req_comp, w, h ); + if ( out == NULL ) return out; // stbi__convert_format frees input on failure + } + + if ( comp )* comp = 4; + *y = h; + *x = w; + + return out; +} +#endif + +// ************************************************************************************************* +// Softimage PIC loader +// by Tom Seddon +// +// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format +// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ + +#ifndef STBI_NO_PIC +static int stbi__pic_is4( stbi__context* s, const char* str ) +{ + int i; + for ( i = 0; i < 4; ++i ) + if ( stbi__get8( s ) != (stbi_uc)str[i] ) + return 0; + + return 1; +} + +static int stbi__pic_test_core( stbi__context* s ) +{ + int i; + + if ( !stbi__pic_is4( s, "\x53\x80\xF6\x34" ) ) + return 0; + + for ( i = 0; i < 84; ++i ) + stbi__get8( s ); + + if ( !stbi__pic_is4( s, "PICT" ) ) + return 0; + + return 1; +} + +typedef struct +{ + stbi_uc size, type, channel; +} stbi__pic_packet; + +static stbi_uc* stbi__readval( stbi__context* s, int channel, stbi_uc* dest ) +{ + int mask = 0x80, i; + + for ( i = 0; i < 4; ++i, mask >>= 1 ) { + if ( channel & mask ) { + if ( stbi__at_eof( s ) ) return stbi__errpuc( "bad file", "PIC file too short" ); + dest[i] = stbi__get8( s ); + } + } + + return dest; +} + +static void stbi__copyval( int channel, stbi_uc* dest, const stbi_uc* src ) +{ + int mask = 0x80, i; + + for ( i = 0; i < 4; ++i, mask >>= 1 ) + if ( channel & mask ) + dest[i] = src[i]; +} + +static stbi_uc* stbi__pic_load_core( stbi__context* s, int width, int height, int* comp, stbi_uc* result ) +{ + int act_comp = 0, num_packets = 0, y, chained; + stbi__pic_packet packets[10]; + + // this will (should...) cater for even some bizarre stuff like having data + // for the same channel in multiple packets. + do { + stbi__pic_packet* packet; + + if ( num_packets == sizeof( packets ) / sizeof( packets[0] ) ) + return stbi__errpuc( "bad format", "too many packets" ); + + packet = &packets[num_packets++]; + + chained = stbi__get8( s ); + packet->size = stbi__get8( s ); + packet->type = stbi__get8( s ); + packet->channel = stbi__get8( s ); + + act_comp |= packet->channel; + + if ( stbi__at_eof( s ) ) return stbi__errpuc( "bad file", "file too short (reading packets)" ); + if ( packet->size != 8 ) return stbi__errpuc( "bad format", "packet isn't 8bpp" ); + } while ( chained ); + + *comp = ( act_comp & 0x10 ? 4 : 3 ); // has alpha channel? + + for ( y = 0; y < height; ++y ) { + int packet_idx; + + for ( packet_idx = 0; packet_idx < num_packets; ++packet_idx ) { + stbi__pic_packet* packet = &packets[packet_idx]; + stbi_uc* dest = result + y * width * 4; + + switch ( packet->type ) { + default: + return stbi__errpuc( "bad format", "packet has bad compression type" ); + + case 0: {//uncompressed + int x; + + for ( x = 0; x < width; ++x, dest += 4 ) + if ( !stbi__readval( s, packet->channel, dest ) ) + return 0; + break; + } + + case 1://Pure RLE + { + int left = width, i; + + while ( left > 0 ) { + stbi_uc count, value[4]; + + count = stbi__get8( s ); + if ( stbi__at_eof( s ) ) return stbi__errpuc( "bad file", "file too short (pure read count)" ); + + if ( count > left ) + count = (stbi_uc)left; + + if ( !stbi__readval( s, packet->channel, value ) ) return 0; + + for ( i = 0; i < count; ++i, dest += 4 ) + stbi__copyval( packet->channel, dest, value ); + left -= count; + } + } + break; + + case 2: {//Mixed RLE + int left = width; + while ( left > 0 ) { + int count = stbi__get8( s ), i; + if ( stbi__at_eof( s ) ) return stbi__errpuc( "bad file", "file too short (mixed read count)" ); + + if ( count >= 128 ) { // Repeated + stbi_uc value[4]; + + if ( count == 128 ) + count = stbi__get16be( s ); + else + count -= 127; + if ( count > left ) + return stbi__errpuc( "bad file", "scanline overrun" ); + + if ( !stbi__readval( s, packet->channel, value ) ) + return 0; + + for ( i = 0; i < count; ++i, dest += 4 ) + stbi__copyval( packet->channel, dest, value ); + } + else { // Raw + ++count; + if ( count > left ) return stbi__errpuc( "bad file", "scanline overrun" ); + + for ( i = 0; i < count; ++i, dest += 4 ) + if ( !stbi__readval( s, packet->channel, dest ) ) + return 0; + } + left -= count; + } + break; + } + } + } + } + + return result; +} + +static void* stbi__pic_load( stbi__context* s, int* px, int* py, int* comp, int req_comp, stbi__result_info* ri ) +{ + stbi_uc* result; + int i, x, y, internal_comp; + STBI_NOTUSED( ri ); + + if ( !comp ) comp = &internal_comp; + + for ( i = 0; i < 92; ++i ) + stbi__get8( s ); + + x = stbi__get16be( s ); + y = stbi__get16be( s ); + if ( 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; // output buffer (always 4 components) + stbi_uc* background; // The current "background" as far as a gif is concerned + stbi_uc* history; + int flags, bgindex, ratio, transparent, eflags; + stbi_uc pal[256][4]; + stbi_uc lpal[256][4]; + stbi__gif_lzw codes[8192]; + stbi_uc* color_table; + int parse, step; + int lflags; + int start_x, start_y; + int max_x, max_y; + int cur_x, cur_y; + int line_size; + int delay; +} stbi__gif; + +static int stbi__gif_test_raw( stbi__context* s ) +{ + int sz; + if ( stbi__get8( s ) != 'G' || stbi__get8( s ) != 'I' || stbi__get8( s ) != 'F' || stbi__get8( s ) != '8' ) return 0; + sz = stbi__get8( s ); + if ( sz != '9' && sz != '7' ) return 0; + if ( stbi__get8( s ) != 'a' ) return 0; + return 1; +} + +static int stbi__gif_test( stbi__context* s ) +{ + int r = stbi__gif_test_raw( s ); + stbi__rewind( s ); + return r; +} + +static void stbi__gif_parse_colortable( stbi__context* s, stbi_uc pal[256][4], int num_entries, int transp ) +{ + int i; + for ( i = 0; i < num_entries; ++i ) { + pal[i][2] = stbi__get8( s ); + pal[i][1] = stbi__get8( s ); + pal[i][0] = stbi__get8( s ); + pal[i][3] = transp == i ? 0 : 255; + } +} + +static int stbi__gif_header( stbi__context* s, stbi__gif* g, int* comp, int is_info ) +{ + stbi_uc version; + if ( stbi__get8( s ) != 'G' || stbi__get8( s ) != 'I' || stbi__get8( s ) != 'F' || stbi__get8( s ) != '8' ) + return stbi__err( "not GIF", "Corrupt GIF" ); + + version = stbi__get8( s ); + if ( version != '7' && version != '9' ) return stbi__err( "not GIF", "Corrupt GIF" ); + if ( stbi__get8( s ) != 'a' ) return stbi__err( "not GIF", "Corrupt GIF" ); + + stbi__g_failure_reason = ""; + g->w = stbi__get16le( s ); + g->h = stbi__get16le( s ); + g->flags = stbi__get8( s ); + g->bgindex = stbi__get8( s ); + g->ratio = stbi__get8( s ); + g->transparent = -1; + + if ( 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; + int idx; + + // recurse to decode the prefixes, since the linked-list is backwards, + // and working backwards through an interleaved image would be nasty + if ( g->codes[code].prefix >= 0 ) + stbi__out_gif_code( g, g->codes[code].prefix ); + + if ( g->cur_y >= g->max_y ) return; + + idx = g->cur_x + g->cur_y; + p = &g->out[idx]; + g->history[idx / 4] = 1; + + c = &g->color_table[g->codes[code].suffix * 4]; + if ( c[3] > 128 ) { // don't render transparent pixels; + p[0] = c[2]; + p[1] = c[1]; + p[2] = c[0]; + p[3] = c[3]; + } + g->cur_x += 4; + + if ( g->cur_x >= g->max_x ) { + g->cur_x = g->start_x; + g->cur_y += g->step; + + while ( g->cur_y >= g->max_y && g->parse > 0 ) { + g->step = ( 1 << g->parse ) * g->line_size; + g->cur_y = g->start_y + ( g->step >> 1 ); + --g->parse; + } + } +} + +static stbi_uc* stbi__process_gif_raster( stbi__context* s, stbi__gif* g ) +{ + stbi_uc lzw_cs; + stbi__int32 len, init_code; + stbi__uint32 first; + stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; + stbi__gif_lzw* p; + + lzw_cs = stbi__get8( s ); + if ( lzw_cs > 12 ) return NULL; + clear = 1 << lzw_cs; + first = 1; + codesize = lzw_cs + 1; + codemask = ( 1 << codesize ) - 1; + bits = 0; + valid_bits = 0; + for ( init_code = 0; init_code < clear; init_code++ ) { + g->codes[init_code].prefix = -1; + g->codes[init_code].first = (stbi_uc)init_code; + g->codes[init_code].suffix = (stbi_uc)init_code; + } + + // support no starting clear code + avail = clear + 2; + oldcode = -1; + + len = 0; + for ( ;;) { + if ( valid_bits < codesize ) { + if ( len == 0 ) { + len = stbi__get8( s ); // start new block + if ( len == 0 ) + return g->out; + } + --len; + bits |= (stbi__int32)stbi__get8( s ) << valid_bits; + valid_bits += 8; + } + else { + stbi__int32 code = bits & codemask; + bits >>= codesize; + valid_bits -= codesize; + // @OPTIMIZE: is there some way we can accelerate the non-clear path? + if ( code == clear ) { // clear code + codesize = lzw_cs + 1; + codemask = ( 1 << codesize ) - 1; + avail = clear + 2; + oldcode = -1; + first = 0; + } + else if ( code == clear + 1 ) { // end of stream code + stbi__skip( s, len ); + while ( ( len = stbi__get8( s ) ) > 0 ) + stbi__skip( s, len ); + return g->out; + } + else if ( code <= avail ) { + if ( first ) { + return stbi__errpuc( "no clear code", "Corrupt GIF" ); + } + + if ( oldcode >= 0 ) { + p = &g->codes[avail++]; + if ( avail > 8192 ) { + return stbi__errpuc( "too many codes", "Corrupt GIF" ); + } + + p->prefix = (stbi__int16)oldcode; + p->first = g->codes[oldcode].first; + p->suffix = ( code == avail ) ? p->first : g->codes[code].first; + } + else if ( code == avail ) + return stbi__errpuc( "illegal code in raster", "Corrupt GIF" ); + + stbi__out_gif_code( g, (stbi__uint16)code ); + + if ( ( avail & codemask ) == 0 && avail <= 0x0FFF ) { + codesize++; + codemask = ( 1 << codesize ) - 1; + } + + oldcode = code; + } + else { + return stbi__errpuc( "illegal code in raster", "Corrupt GIF" ); + } + } + } +} + +// this function is designed to support animated gifs, although stb_image doesn't support it +// two back is the image from two frames ago, used for a very specific disposal format +static stbi_uc* stbi__gif_load_next( stbi__context* s, stbi__gif* g, int* comp, int req_comp, stbi_uc* two_back ) +{ + int dispose; + int first_frame; + int pi; + int pcount; + STBI_NOTUSED( req_comp ); + + // on first frame, any non-written pixels get the background colour (non-transparent) + first_frame = 0; + if ( g->out == 0 ) { + if ( !stbi__gif_header( s, g, comp, 0 ) ) return 0; // stbi__g_failure_reason set by stbi__gif_header + if ( !stbi__mad3sizes_valid( 4, g->w, g->h, 0 ) ) + return stbi__errpuc( "too large", "GIF image is too large" ); + pcount = g->w * g->h; + g->out = (stbi_uc*)stbi__malloc( 4 * pcount ); + g->background = (stbi_uc*)stbi__malloc( 4 * pcount ); + g->history = (stbi_uc*)stbi__malloc( pcount ); + if ( !g->out || !g->background || !g->history ) + return stbi__errpuc( "outofmem", "Out of memory" ); + + // image is treated as "transparent" at the start - ie, nothing overwrites the current background; + // background colour is only used for pixels that are not rendered first frame, after that "background" + // color refers to the color that was there the previous frame. + memset( g->out, 0x00, 4 * pcount ); + memset( g->background, 0x00, 4 * pcount ); // state of the background (starts transparent) + memset( g->history, 0x00, pcount ); // pixels that were affected previous frame + first_frame = 1; + } + else { + // second frame - how do we dispoase of the previous one? + dispose = ( g->eflags & 0x1C ) >> 2; + pcount = g->w * g->h; + + if ( ( dispose == 3 ) && ( two_back == 0 ) ) { + dispose = 2; // if I don't have an image to revert back to, default to the old background + } + + if ( dispose == 3 ) { // use previous graphic + for ( pi = 0; pi < pcount; ++pi ) { + if ( g->history[pi] ) { + memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 ); + } + } + } + else if ( dispose == 2 ) { + // restore what was changed last frame to background before that frame; + for ( pi = 0; pi < pcount; ++pi ) { + if ( g->history[pi] ) { + memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 ); + } + } + } + else { + // This is a non-disposal case eithe way, so just + // leave the pixels as is, and they will become the new background + // 1: do not dispose + // 0: not specified. + } + + // background is what out is after the undoing of the previou frame; + memcpy( g->background, g->out, 4 * g->w * g->h ); + } + + // clear my history; + memset( g->history, 0x00, g->w * g->h ); // pixels that were affected previous frame + + for ( ;;) { + int tag = stbi__get8( s ); + switch ( tag ) { + case 0x2C: /* Image Descriptor */ + { + stbi__int32 x, y, w, h; + stbi_uc* o; + + x = stbi__get16le( s ); + y = stbi__get16le( s ); + w = stbi__get16le( s ); + h = stbi__get16le( s ); + if ( ( ( x + w ) > ( g->w ) ) || ( ( y + h ) > ( g->h ) ) ) + return stbi__errpuc( "bad Image Descriptor", "Corrupt GIF" ); + + g->line_size = g->w * 4; + g->start_x = x * 4; + g->start_y = y * g->line_size; + g->max_x = g->start_x + w * 4; + g->max_y = g->start_y + h * g->line_size; + g->cur_x = g->start_x; + g->cur_y = g->start_y; + + // if the width of the specified rectangle is 0, that means + // we may not see *any* pixels or the image is malformed; + // to make sure this is caught, move the current y down to + // max_y (which is what out_gif_code checks). + if ( w == 0 ) + g->cur_y = g->max_y; + + g->lflags = stbi__get8( s ); + + if ( g->lflags & 0x40 ) { + g->step = 8 * g->line_size; // first interlaced spacing + g->parse = 3; + } + else { + g->step = g->line_size; + g->parse = 0; + } + + if ( g->lflags & 0x80 ) { + stbi__gif_parse_colortable( s, g->lpal, 2 << ( g->lflags & 7 ), g->eflags & 0x01 ? g->transparent : -1 ); + g->color_table = (stbi_uc*)g->lpal; + } + else if ( g->flags & 0x80 ) { + g->color_table = (stbi_uc*)g->pal; + } + else + return stbi__errpuc( "missing color table", "Corrupt GIF" ); + + o = stbi__process_gif_raster( s, g ); + if ( !o ) return NULL; + + // if this was the first frame, + pcount = g->w * g->h; + if ( first_frame && ( g->bgindex > 0 ) ) { + // if first frame, any pixel not drawn to gets the background color + for ( pi = 0; pi < pcount; ++pi ) { + if ( g->history[pi] == 0 ) { + g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be; + memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 ); + } + } + } + + return o; + } + + case 0x21: // Comment Extension. + { + int len; + int ext = stbi__get8( s ); + if ( ext == 0xF9 ) { // Graphic Control Extension. + len = stbi__get8( s ); + if ( len == 4 ) { + g->eflags = stbi__get8( s ); + g->delay = 10 * stbi__get16le( s ); // delay - 1/100th of a second, saving as 1/1000ths. + + // unset old transparent + if ( g->transparent >= 0 ) { + g->pal[g->transparent][3] = 255; + } + if ( g->eflags & 0x01 ) { + g->transparent = stbi__get8( s ); + if ( g->transparent >= 0 ) { + g->pal[g->transparent][3] = 0; + } + } + else { + // don't need transparent + stbi__skip( s, 1 ); + g->transparent = -1; + } + } + else { + stbi__skip( s, len ); + break; + } + } + while ( ( len = stbi__get8( s ) ) != 0 ) { + stbi__skip( s, len ); + } + break; + } + + case 0x3B: // gif stream termination code + return (stbi_uc*)s; // using '1' causes warning on some compilers + + default: + return stbi__errpuc( "unknown code", "Corrupt GIF" ); + } + } +} + +static void* stbi__load_gif_main( stbi__context* s, int** delays, int* x, int* y, int* z, int* comp, int req_comp ) +{ + if ( stbi__gif_test( s ) ) { + int layers = 0; + stbi_uc* u = 0; + stbi_uc* out = 0; + stbi_uc* two_back = 0; + stbi__gif g; + int stride; + memset( &g, 0, sizeof( g ) ); + if ( delays ) { + *delays = 0; + } + + do { + u = stbi__gif_load_next( s, &g, comp, req_comp, two_back ); + if ( u == (stbi_uc*)s ) u = 0; // end of animated gif marker + + if ( u ) { + *x = g.w; + *y = g.h; + ++layers; + stride = g.w * g.h * 4; + + if ( out ) { + out = (stbi_uc*)STBI_REALLOC( out, layers * stride ); + if ( delays ) { + *delays = (int*)STBI_REALLOC( *delays, sizeof( int ) * layers ); + } + } + else { + out = (stbi_uc*)stbi__malloc( layers * stride ); + if ( delays ) { + *delays = (int*)stbi__malloc( layers * sizeof( int ) ); + } + } + memcpy( out + ( ( layers - 1 ) * stride ), u, stride ); + if ( layers >= 2 ) { + two_back = out - 2 * stride; + } + + if ( delays ) { + ( *delays )[layers - 1U] = g.delay; + } + } + } while ( u != 0 ); + + // free temp buffer; + STBI_FREE( g.out ); + STBI_FREE( g.history ); + STBI_FREE( g.background ); + + // do the final conversion after loading everything; + if ( req_comp && req_comp != 4 ) + out = stbi__convert_format( out, 4, req_comp, layers * g.w, g.h ); + + *z = layers; + return out; + } + else { + return stbi__errpuc( "not GIF", "Image was not as a gif type." ); + } +} + +static void* stbi__gif_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ) +{ + stbi_uc* u = 0; + stbi__gif g; + memset( &g, 0, sizeof( g ) ); + STBI_NOTUSED( ri ); + + u = stbi__gif_load_next( s, &g, comp, req_comp, 0 ); + if ( u == (stbi_uc*)s ) u = 0; // end of animated gif marker + if ( u ) { + *x = g.w; + *y = g.h; + + // moved conversion to after successful load so that the same + // can be done for multiple frames. + if ( req_comp && req_comp != 4 ) + u = stbi__convert_format( u, 4, req_comp, g.w, g.h ); + } + else if ( g.out ) { + // if there was an error and we allocated an image buffer, free it! + STBI_FREE( g.out ); + } + + // free buffers needed for multiple frame loading; + STBI_FREE( g.history ); + STBI_FREE( g.background ); + + return u; +} + +static int stbi__gif_info( stbi__context* s, int* x, int* y, int* comp ) +{ + return stbi__gif_info_raw( s, x, y, comp ); +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int stbi__hdr_test_core( stbi__context* s, const char* signature ) +{ + int i; + for ( i = 0; signature[i]; ++i ) + if ( stbi__get8( s ) != signature[i] ) + return 0; + stbi__rewind( s ); + return 1; +} + +static int stbi__hdr_test( stbi__context* s ) +{ + int r = stbi__hdr_test_core( s, "#?RADIANCE\n" ); + stbi__rewind( s ); + if ( !r ) { + r = stbi__hdr_test_core( s, "#?RGBE\n" ); + stbi__rewind( s ); + } + return r; +} + +#define STBI__HDR_BUFLEN 1024 +static char* stbi__hdr_gettoken( stbi__context * z, char* buffer ) +{ + int len = 0; + char c = '\0'; + + c = (char)stbi__get8( z ); + + while ( !stbi__at_eof( z ) && c != '\n' ) { + buffer[len++] = c; + if ( len == STBI__HDR_BUFLEN - 1 ) { + // flush to end of line + while ( !stbi__at_eof( z ) && stbi__get8( z ) != '\n' ) + ; + break; + } + c = (char)stbi__get8( z ); + } + + buffer[len] = 0; + return buffer; +} + +static void stbi__hdr_convert( float* output, stbi_uc* input, int req_comp ) +{ + if ( input[3] != 0 ) { + float f1; + // Exponent + f1 = (float)ldexp( 1.0f, input[3] - (int)( 128 + 8 ) ); + if ( req_comp <= 2 ) + output[0] = ( input[0] + input[1] + input[2] ) * f1 / 3; + else { + output[0] = input[0] * f1; + output[1] = input[1] * f1; + output[2] = input[2] * f1; + } + if ( req_comp == 2 ) output[1] = 1; + if ( req_comp == 4 ) output[3] = 1; + } + else { + switch ( req_comp ) { + case 4: output[3] = 1; /* fallthrough */ + case 3: output[0] = output[1] = output[2] = 0; + break; + case 2: output[1] = 1; /* fallthrough */ + case 1: output[0] = 0; + break; + } + } +} + +static float* stbi__hdr_load( stbi__context* s, int* x, int* y, int* comp, int req_comp, stbi__result_info* ri ) +{ + char buffer[STBI__HDR_BUFLEN]; + char* token; + int valid = 0; + int width, height; + stbi_uc* scanline; + float* hdr_data; + int len; + unsigned char count, value; + int i, j, k, c1, c2, z; + const char* headerToken; + STBI_NOTUSED( ri ); + + // Check identifier + headerToken = stbi__hdr_gettoken( s, buffer ); + if ( strcmp( headerToken, "#?RADIANCE" ) != 0 && strcmp( headerToken, "#?RGBE" ) != 0 ) + return stbi__errpf( "not HDR", "Corrupt HDR image" ); + + // Parse header + for ( ;;) { + token = stbi__hdr_gettoken( s, buffer ); + if ( token[0] == 0 ) break; + if ( strcmp( token, "FORMAT=32-bit_rle_rgbe" ) == 0 ) valid = 1; + } + + if ( !valid ) return stbi__errpf( "unsupported format", "Unsupported HDR format" ); + + // Parse width and height + // can't use sscanf() if we're not using stdio! + token = stbi__hdr_gettoken( s, buffer ); + if ( strncmp( token, "-Y ", 3 ) ) return stbi__errpf( "unsupported data layout", "Unsupported HDR format" ); + token += 3; + height = (int)strtol( token, &token, 10 ); + while ( *token == ' ' ) ++token; + if ( strncmp( token, "+X ", 3 ) ) return stbi__errpf( "unsupported data layout", "Unsupported HDR format" ); + token += 3; + width = (int)strtol( token, NULL, 10 ); + + *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; + int dummy; + + if ( !x ) x = &dummy; + if ( !y ) y = &dummy; + if ( !comp ) comp = &dummy; + + if ( stbi__hdr_test( s ) == 0 ) { + stbi__rewind( s ); + return 0; + } + + for ( ;;) { + token = stbi__hdr_gettoken( s, buffer ); + if ( token[0] == 0 ) break; + if ( strcmp( token, "FORMAT=32-bit_rle_rgbe" ) == 0 ) valid = 1; + } + + if ( !valid ) { + stbi__rewind( s ); + return 0; + } + token = stbi__hdr_gettoken( s, buffer ); + if ( strncmp( token, "-Y ", 3 ) ) { + stbi__rewind( s ); + return 0; + } + token += 3; + *y = (int)strtol( token, &token, 10 ); + while ( *token == ' ' ) ++token; + if ( strncmp( token, "+X ", 3 ) ) { + stbi__rewind( s ); + return 0; + } + token += 3; + *x = (int)strtol( token, NULL, 10 ); + *comp = 3; + return 1; +} +#endif // STBI_NO_HDR + +#ifndef STBI_NO_BMP +static int stbi__bmp_info( stbi__context* s, int* x, int* y, int* comp ) +{ + void* p; + stbi__bmp_data info; + + info.all_a = 255; + p = stbi__bmp_parse_header( s, &info ); + stbi__rewind( s ); + if ( p == NULL ) + return 0; + if ( x )* x = s->img_x; + if ( y )* y = s->img_y; + if ( comp ) { + if ( info.bpp == 24 && info.ma == 0xff000000 ) + * comp = 3; + else + *comp = info.ma ? 4 : 3; + } + return 1; +} +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_info( stbi__context* s, int* x, int* y, int* comp ) +{ + int channelCount, dummy, depth; + if ( !x ) x = &dummy; + if ( !y ) y = &dummy; + if ( !comp ) comp = &dummy; + if ( stbi__get32be( s ) != 0x38425053 ) { + stbi__rewind( s ); + return 0; + } + if ( stbi__get16be( s ) != 1 ) { + stbi__rewind( s ); + return 0; + } + stbi__skip( s, 6 ); + channelCount = stbi__get16be( s ); + if ( channelCount < 0 || channelCount > 16 ) { + stbi__rewind( s ); + return 0; + } + *y = stbi__get32be( s ); + *x = stbi__get32be( s ); + depth = stbi__get16be( s ); + if ( depth != 8 && depth != 16 ) { + stbi__rewind( s ); + return 0; + } + if ( stbi__get16be( s ) != 3 ) { + stbi__rewind( s ); + return 0; + } + *comp = 4; + return 1; +} + +static int stbi__psd_is16( stbi__context* s ) +{ + int channelCount, depth; + if ( stbi__get32be( s ) != 0x38425053 ) { + stbi__rewind( s ); + return 0; + } + if ( stbi__get16be( s ) != 1 ) { + stbi__rewind( s ); + return 0; + } + stbi__skip( s, 6 ); + channelCount = stbi__get16be( s ); + if ( channelCount < 0 || channelCount > 16 ) { + stbi__rewind( s ); + return 0; + } + (void)stbi__get32be( s ); + (void)stbi__get32be( s ); + depth = stbi__get16be( s ); + if ( depth != 16 ) { + stbi__rewind( s ); + return 0; + } + return 1; +} +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_info( stbi__context* s, int* x, int* y, int* comp ) +{ + int act_comp = 0, num_packets = 0, chained, dummy; + stbi__pic_packet packets[10]; + + if ( !x ) x = &dummy; + if ( !y ) y = &dummy; + if ( !comp ) comp = &dummy; + + if ( !stbi__pic_is4( s, "\x53\x80\xF6\x34" ) ) { + stbi__rewind( s ); + return 0; + } + + stbi__skip( s, 88 ); + + *x = stbi__get16be( s ); + *y = stbi__get16be( s ); + if ( stbi__at_eof( s ) ) { + stbi__rewind( s ); + return 0; + } + if ( ( *x ) != 0 && ( 1 << 28 ) / ( *x ) < ( *y ) ) { + stbi__rewind( s ); + return 0; + } + + stbi__skip( s, 8 ); + + do { + stbi__pic_packet* packet; + + if ( num_packets == sizeof( packets ) / sizeof( packets[0] ) ) + return 0; + + packet = &packets[num_packets++]; + chained = stbi__get8( s ); + packet->size = stbi__get8( s ); + packet->type = stbi__get8( s ); + packet->channel = stbi__get8( s ); + act_comp |= packet->channel; + + if ( stbi__at_eof( s ) ) { + stbi__rewind( s ); + return 0; + } + if ( packet->size != 8 ) { + stbi__rewind( s ); + return 0; + } + } while ( chained ); + + *comp = ( act_comp & 0x10 ? 4 : 3 ); + + return 1; +} +#endif + +// ************************************************************************************************* +// Portable Gray Map and Portable Pixel Map loader +// by Ken Miller +// +// PGM: http://netpbm.sourceforge.net/doc/pgm.html +// PPM: http://netpbm.sourceforge.net/doc/ppm.html +// +// Known limitations: +// Does not support comments in the header section +// Does not support ASCII image data (formats P2 and P3) +// 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; + if ( comp )* 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, dummy; + char c, p, t; + + if ( !x ) x = &dummy; + if ( !y ) y = &dummy; + if ( !comp ) comp = &dummy; + + stbi__rewind( s ); + + // Get identifier + p = (char)stbi__get8( s ); + t = (char)stbi__get8( s ); + if ( p != 'P' || ( t != '5' && t != '6' ) ) { + stbi__rewind( s ); + return 0; + } + + *comp = ( t == '6' ) ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm + + c = (char)stbi__get8( s ); + stbi__pnm_skip_whitespace( s, &c ); + + *x = stbi__pnm_getinteger( s, &c ); // read width + 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" ); +} + +static int stbi__is_16_main( stbi__context* s ) +{ +#ifndef STBI_NO_PNG + if ( stbi__png_is16( s ) ) return 1; +#endif + +#ifndef STBI_NO_PSD + if ( stbi__psd_is16( s ) ) return 1; +#endif + + return 0; +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info( char const* filename, int* x, int* y, int* comp ) +{ + FILE* f = stbi__fopen( filename, "rb" ); + int result; + if ( !f ) return stbi__err( "can't fopen", "Unable to open file" ); + result = stbi_info_from_file( f, x, y, comp ); + fclose( f ); + return result; +} + +STBIDEF int stbi_info_from_file( FILE* f, int* x, int* y, int* comp ) +{ + int r; + stbi__context s; + long pos = ftell( f ); + stbi__start_file( &s, f ); + r = stbi__info_main( &s, x, y, comp ); + fseek( f, pos, SEEK_SET ); + return r; +} + +STBIDEF int stbi_is_16_bit( char const* filename ) +{ + FILE* f = stbi__fopen( filename, "rb" ); + int result; + if ( !f ) return stbi__err( "can't fopen", "Unable to open file" ); + result = stbi_is_16_bit_from_file( f ); + fclose( f ); + return result; +} + +STBIDEF int stbi_is_16_bit_from_file( FILE* f ) +{ + int r; + stbi__context s; + long pos = ftell( f ); + stbi__start_file( &s, f ); + r = stbi__is_16_main( &s ); + fseek( f, pos, SEEK_SET ); + return r; +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_info_from_memory( stbi_uc const* buffer, int len, int* x, int* y, int* comp ) +{ + stbi__context s; + stbi__start_mem( &s, buffer, len ); + return stbi__info_main( &s, x, y, comp ); +} + +STBIDEF int stbi_info_from_callbacks( stbi_io_callbacks const* c, void* user, int* x, int* y, int* comp ) +{ + stbi__context s; + stbi__start_callbacks( &s, (stbi_io_callbacks*)c, user ); + return stbi__info_main( &s, x, y, comp ); +} + +STBIDEF int stbi_is_16_bit_from_memory( stbi_uc const* buffer, int len ) +{ + stbi__context s; + stbi__start_mem( &s, buffer, len ); + return stbi__is_16_main( &s ); +} + +STBIDEF int stbi_is_16_bit_from_callbacks( stbi_io_callbacks const* c, void* user ) +{ + stbi__context s; + stbi__start_callbacks( &s, (stbi_io_callbacks*)c, user ); + return stbi__is_16_main( &s ); +} + +#endif // STB_IMAGE_IMPLEMENTATION + +/* + revision history: + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs + 2.19 (2018-02-11) fix warning + 2.18 (2018-01-30) fix warnings + 2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug + 1-bit BMP + *_is_16_bit api + avoid warnings + 2.16 (2017-07-23) all functions have 16-bit variants; + STBI_NO_STDIO works again; + compilation fixes; + fix rounding in unpremultiply; + optimize vertical flip; + disable raw_len validation; + documentation fixes + 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode; + warning fixes; disable run-time SSE detection on gcc; + uniform handling of optional "return" values; + thread-safe initialization of zlib tables + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs + 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes + 2.11 (2016-04-02) allocate large structures on the stack + remove white matting for transparent PSD + fix reported channel count for PNG & BMP + re-enable SSE2 in non-gcc 64-bit + support RGB-formatted JPEG + read 16-bit PNGs (only as 8-bit) + 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED + 2.09 (2016-01-16) allow comments in PNM files + 16-bit-per-pixel TGA (not bit-per-component) + info() for TGA could break due to .hdr handling + info() for BMP to shares code instead of sloppy parse + can use STBI_REALLOC_SIZED if allocator doesn't support realloc + code cleanup + 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA + 2.07 (2015-09-13) fix compiler warnings + partial animated GIF support + limited 16-bpc PSD support + #ifdef unused functions + bug with < 92 byte PIC,PNM,HDR,TGA + 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value + 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning + 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit + 2.03 (2015-04-12) extra corruption checking (mmozeiko) + stbi_set_flip_vertically_on_load (nguillemot) + fix NEON support; fix mingw support + 2.02 (2015-01-19) fix incorrect assert, fix warning + 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 + 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG + 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) + progressive JPEG (stb) + PGM/PPM support (Ken Miller) + STBI_MALLOC,STBI_REALLOC,STBI_FREE + GIF bugfix -- seemingly never worked + STBI_NO_*, STBI_ONLY_* + 1.48 (2014-12-14) fix incorrectly-named assert() + 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) + optimize PNG (ryg) + fix bug in interlaced PNG with user-specified channel count (stb) + 1.46 (2014-08-26) + fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG + 1.45 (2014-08-16) + fix MSVC-ARM internal compiler error by wrapping malloc + 1.44 (2014-08-07) + various warning fixes from Ronny Chevalier + 1.43 (2014-07-15) + fix MSVC-only compiler problem in code changed in 1.42 + 1.42 (2014-07-09) + don't define _CRT_SECURE_NO_WARNINGS (affects user code) + fixes to stbi__cleanup_jpeg path + added STBI_ASSERT to avoid requiring assert.h + 1.41 (2014-06-25) + fix search&replace from 1.36 that messed up comments/error messages + 1.40 (2014-06-22) + fix gcc struct-initialization warning + 1.39 (2014-06-15) + fix to TGA optimization when req_comp != number of components in TGA; + fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) + add support for BMP version 5 (more ignored fields) + 1.38 (2014-06-06) + suppress MSVC warnings on integer casts truncating values + fix accidental rename of 'skip' field of I/O + 1.37 (2014-06-04) + remove duplicate typedef + 1.36 (2014-06-03) + convert to header file single-file library + if de-iphone isn't set, load iphone images color-swapped instead of returning NULL + 1.35 (2014-05-27) + various warnings + fix broken STBI_SIMD path + fix bug where stbi_load_from_file no longer left file pointer in correct place + fix broken non-easy path for 32-bit BMP (possibly never used) + TGA optimization by Arseny Kapoulkine + 1.34 (unknown) + use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case + 1.33 (2011-07-14) + make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements + 1.32 (2011-07-13) + support for "info" function for all supported filetypes (SpartanJ) + 1.31 (2011-06-20) + a few more leak fixes, bug in PNG handling (SpartanJ) + 1.30 (2011-06-11) + added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) + removed deprecated format-specific test/load functions + removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway + error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) + fix inefficiency in decoding 32-bit BMP (David Woo) + 1.29 (2010-08-16) + various warning fixes from Aurelien Pocheville + 1.28 (2010-08-01) + fix bug in GIF palette transparency (SpartanJ) + 1.27 (2010-08-01) + cast-to-stbi_uc to fix warnings + 1.26 (2010-07-24) + fix bug in file buffering for PNG reported by SpartanJ + 1.25 (2010-07-17) + refix trans_data warning (Won Chun) + 1.24 (2010-07-12) + perf improvements reading from files on platforms with lock-heavy fgetc() + minor perf improvements for jpeg + deprecated type-specific functions so we'll get feedback if they're needed + attempt to fix trans_data warning (Won Chun) + 1.23 fixed bug in iPhone support + 1.22 (2010-07-10) + removed image *writing* support + stbi_info support from Jetro Lauha + GIF support from Jean-Marc Lienher + iPhone PNG-extensions from James Brown + warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) + 1.21 fix use of 'stbi_uc' in header (reported by jon blow) + 1.20 added support for Softimage PIC, by Tom Seddon + 1.19 bug in interlaced PNG corruption check (found by ryg) + 1.18 (2008-08-02) + fix a threading bug (local mutable static) + 1.17 support interlaced PNG + 1.16 major bugfix - stbi__convert_format converted one too many pixels + 1.15 initialize some fields for thread safety + 1.14 fix threadsafe conversion bug + header-file-only version (#define STBI_HEADER_FILE_ONLY before including) + 1.13 threadsafe + 1.12 const qualifiers in the API + 1.11 Support installable IDCT, colorspace conversion routines + 1.10 Fixes for 64-bit (don't use "unsigned long") + optimized upsampling by Fabian "ryg" Giesen + 1.09 Fix format-conversion for PSD code (bad global variables!) + 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz + 1.07 attempt to fix C++ warning/errors again + 1.06 attempt to fix C++ warning/errors again + 1.05 fix TGA loading to return correct *comp and use good luminance calc + 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free + 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR + 1.02 support for (subset of) HDR files, float interface for preferred access to them + 1.01 fix bug: possible bug in handling right-side up bmps... not sure + fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all + 1.00 interface to zlib that skips zlib header + 0.99 correct handling of alpha in palette + 0.98 TGA loader by lonesock; dynamically add loaders (untested) + 0.97 jpeg errors on too large a file; also catch another malloc failure + 0.96 fix detection of invalid v value - particleman@mollyrocket forum + 0.95 during header scan, seek to markers in case of padding + 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same + 0.93 handle jpegtran output; verbose errors + 0.92 read 4,8,16,24,32-bit BMP files of several formats + 0.91 output 24-bit Windows 3.0 BMP files + 0.90 fix a few more warnings; bump version number to approach 1.0 + 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd + 0.60 fix compiling as c++ + 0.59 fix warnings: merge Dave Moore's -Wall fixes + 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian + 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available + 0.56 fix bug: zlib uncompressed mode len vs. nlen + 0.55 fix bug: restart_interval not initialized to 0 + 0.54 allow NULL for 'int *comp' + 0.53 fix bug in png 3->4; speedup png decoding + 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments + 0.51 obey req_comp requests, 1-component jpegs return as 1-component, + on 'test' only check type, not whether we support this variant + 0.50 (2006-11-19) + first released version +*/ + + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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