diff --git a/Vulkan/Vulkan.vcxproj b/Vulkan/Vulkan.vcxproj index bdb1254..eb0166f 100644 --- a/Vulkan/Vulkan.vcxproj +++ b/Vulkan/Vulkan.vcxproj @@ -125,6 +125,13 @@ $(ProjectDir)ext/lib/;C:/VulkanSDK/1.3.236.0/Lib;%(AdditionalLibraryDirectories) vulkan-1.lib;glfw3.lib;%(AdditionalDependencies) + + + + + + glslc res/shaders/shader.vert -o res/shaders/vert.spv && glslc res/shaders/shader.frag -o res/shaders/frag.spv + @@ -145,6 +152,13 @@ $(ProjectDir)ext/lib/;C:/VulkanSDK/1.3.236.0/Lib;%(AdditionalLibraryDirectories) vulkan-1.lib;glfw3.lib;%(AdditionalDependencies) + + + + + + glslc res/shaders/shader.vert -o res/shaders/vert.spv && glslc res/shaders/shader.frag -o res/shaders/frag.spv + @@ -155,6 +169,7 @@ + @@ -170,9 +185,11 @@ - + + + diff --git a/Vulkan/Vulkan.vcxproj.filters b/Vulkan/Vulkan.vcxproj.filters index 39c3ae0..e63f622 100644 --- a/Vulkan/Vulkan.vcxproj.filters +++ b/Vulkan/Vulkan.vcxproj.filters @@ -74,12 +74,17 @@ Header Files + + Header Files + - + Source Files + + \ No newline at end of file diff --git a/Vulkan/ext/include/stb/stb_image.h b/Vulkan/ext/include/stb/stb_image.h new file mode 100644 index 0000000..f7a26d7 --- /dev/null +++ b/Vulkan/ext/include/stb/stb_image.h @@ -0,0 +1,7897 @@ +/* stb_image - v2.27 - 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: + +2.27 (2021-07-11) document stbi_info better, 16-bit PNM support, bug fixes +2.26 (2020-07-13) many minor fixes +2.25 (2020-02-02) fix warnings +2.24 (2020-02-02) fix warnings; thread-local failure_reason and flip_vertically +2.23 (2019-08-11) fix clang static analysis warning +2.22 (2019-03-04) gif fixes, fix warnings +2.21 (2019-02-25) fix typo in comment +2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs +2.19 (2018-02-11) fix warning +2.18 (2018-01-30) fix warnings +2.17 (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings +2.16 (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes +2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC +2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs +2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes +2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes +2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 +RGB-format JPEG; remove white matting in PSD; +allocate large structures on the stack; +correct channel count for PNG & BMP +2.10 (2016-01-22) avoid warning introduced in 2.09 +2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED + +See end of file for full revision history. + + +============================ Contributors ========================= + +Image formats Extensions, features +Sean Barrett (jpeg, png, bmp) Jetro Lauha (stbi_info) +Nicolas Schulz (hdr, psd) Martin "SpartanJ" Golini (stbi_info) +Jonathan Dummer (tga) James "moose2000" Brown (iPhone PNG) +Jean-Marc Lienher (gif) Ben "Disch" Wenger (io callbacks) +Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) +Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) +Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) +github:urraka (animated gif) Junggon Kim (PNM comments) +Christopher Forseth (animated gif) Daniel Gibson (16-bit TGA) +socks-the-fox (16-bit PNG) +Jeremy Sawicki (handle all ImageNet JPGs) +Optimizations & bugfixes Mikhail Morozov (1-bit BMP) +Fabian "ryg" Giesen Anael Seghezzi (is-16-bit query) +Arseny Kapoulkine Simon Breuss (16-bit PNM) +John-Mark Allen +Carmelo J Fdez-Aguera + +Bug & warning fixes +Marc LeBlanc David Woo Guillaume George Martins Mozeiko +Christpher Lloyd Jerry Jansson Joseph Thomson Blazej Dariusz Roszkowski +Phil Jordan Dave Moore Roy Eltham +Hayaki Saito Nathan Reed Won Chun +Luke Graham Johan Duparc Nick Verigakis the Horde3D community +Thomas Ruf Ronny Chevalier github:rlyeh +Janez Zemva John Bartholomew Michal Cichon github:romigrou +Jonathan Blow Ken Hamada Tero Hanninen github:svdijk +Eugene Golushkov Laurent Gomila Cort Stratton github:snagar +Aruelien Pocheville Sergio Gonzalez Thibault Reuille github:Zelex +Cass Everitt Ryamond Barbiero github:grim210 +Paul Du Bois Engin Manap Aldo Culquicondor github:sammyhw +Philipp Wiesemann Dale Weiler Oriol Ferrer Mesia github:phprus +Josh Tobin Matthew Gregan github:poppolopoppo +Julian Raschke Gregory Mullen Christian Floisand github:darealshinji +Baldur Karlsson Kevin Schmidt JR Smith github:Michaelangel007 +Brad Weinberger Matvey Cherevko github:mosra +Luca Sas Alexander Veselov Zack Middleton [reserved] +Ryan C. Gordon [reserved] [reserved] +DO NOT ADD YOUR NAME HERE + +Jacko Dirks + +To add your name to the credits, pick a random blank space in the middle and fill it. +80% of merge conflicts on stb PRs are due to people adding their name at the end +of the credits. +*/ + +#ifndef STBI_INCLUDE_STB_IMAGE_H +#define STBI_INCLUDE_STB_IMAGE_H + +// DOCUMENTATION +// +// Limitations: +// - no 12-bit-per-channel JPEG +// - no JPEGs with arithmetic coding +// - GIF always returns *comp=4 +// +// Basic usage (see HDR discussion below for HDR usage): +// int x,y,n; +// unsigned char *data = stbi_load(filename, &x, &y, &n, 0); +// // ... process data if not NULL ... +// // ... x = width, y = height, n = # 8-bit components per pixel ... +// // ... replace '0' with '1'..'4' to force that many components per pixel +// // ... but 'n' will always be the number that it would have been if you said 0 +// stbi_image_free(data) +// +// Standard parameters: +// int *x -- outputs image width in pixels +// int *y -- outputs image height in pixels +// int *channels_in_file -- outputs # of image components in image file +// int desired_channels -- if non-zero, # of image components requested in result +// +// The return value from an image loader is an 'unsigned char *' which points +// to the pixel data, or NULL on an allocation failure or if the image is +// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels, +// with each pixel consisting of N interleaved 8-bit components; the first +// pixel pointed to is top-left-most in the image. There is no padding between +// image scanlines or between pixels, regardless of format. The number of +// components N is 'desired_channels' if desired_channels is non-zero, or +// *channels_in_file otherwise. If desired_channels is non-zero, +// *channels_in_file has the number of components that _would_ have been +// output otherwise. E.g. if you set desired_channels to 4, you will always +// get RGBA output, but you can check *channels_in_file to see if it's trivially +// opaque because e.g. there were only 3 channels in the source image. +// +// An output image with N components has the following components interleaved +// in this order in each pixel: +// +// N=#comp components +// 1 grey +// 2 grey, alpha +// 3 red, green, blue +// 4 red, green, blue, alpha +// +// If image loading fails for any reason, the return value will be NULL, +// and *x, *y, *channels_in_file will be unchanged. The function +// stbi_failure_reason() can be queried for an extremely brief, end-user +// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS +// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly +// more user-friendly ones. +// +// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. +// +// To query the width, height and component count of an image without having to +// decode the full file, you can use the stbi_info family of functions: +// +// int x,y,n,ok; +// ok = stbi_info(filename, &x, &y, &n); +// // returns ok=1 and sets x, y, n if image is a supported format, +// // 0 otherwise. +// +// Note that stb_image pervasively uses ints in its public API for sizes, +// including sizes of memory buffers. This is now part of the API and thus +// hard to change without causing breakage. As a result, the various image +// loaders all have certain limits on image size; these differ somewhat +// by format but generally boil down to either just under 2GB or just under +// 1GB. When the decoded image would be larger than this, stb_image decoding +// will fail. +// +// Additionally, stb_image will reject image files that have any of their +// dimensions set to a larger value than the configurable STBI_MAX_DIMENSIONS, +// which defaults to 2**24 = 16777216 pixels. Due to the above memory limit, +// the only way to have an image with such dimensions load correctly +// is for it to have a rather extreme aspect ratio. Either way, the +// assumption here is that such larger images are likely to be malformed +// or malicious. If you do need to load an image with individual dimensions +// larger than that, and it still fits in the overall size limit, you can +// #define STBI_MAX_DIMENSIONS on your own to be something larger. +// +// =========================================================================== +// +// UNICODE: +// +// If compiling for Windows and you wish to use Unicode filenames, compile +// with +// #define STBI_WINDOWS_UTF8 +// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert +// Windows wchar_t filenames to utf8. +// +// =========================================================================== +// +// Philosophy +// +// stb libraries are designed with the following priorities: +// +// 1. easy to use +// 2. easy to maintain +// 3. good performance +// +// Sometimes I let "good performance" creep up in priority over "easy to maintain", +// and for best performance I may provide less-easy-to-use APIs that give higher +// performance, in addition to the easy-to-use ones. Nevertheless, it's important +// to keep in mind that from the standpoint of you, a client of this library, +// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all. +// +// Some secondary priorities arise directly from the first two, some of which +// provide more explicit reasons why performance can't be emphasized. +// +// - Portable ("ease of use") +// - Small source code footprint ("easy to maintain") +// - No dependencies ("ease of use") +// +// =========================================================================== +// +// I/O callbacks +// +// I/O callbacks allow you to read from arbitrary sources, like packaged +// files or some other source. Data read from callbacks are processed +// through a small internal buffer (currently 128 bytes) to try to reduce +// overhead. +// +// The three functions you must define are "read" (reads some bytes of data), +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). +// +// =========================================================================== +// +// SIMD support +// +// The JPEG decoder will try to automatically use SIMD kernels on x86 when +// supported by the compiler. For ARM Neon support, you must explicitly +// request it. +// +// (The old do-it-yourself SIMD API is no longer supported in the current +// code.) +// +// On x86, SSE2 will automatically be used when available based on a run-time +// test; if not, the generic C versions are used as a fall-back. On ARM targets, +// the typical path is to have separate builds for NEON and non-NEON devices +// (at least this is true for iOS and Android). Therefore, the NEON support is +// toggled by a build flag: define STBI_NEON to get NEON loops. +// +// If for some reason you do not want to use any of SIMD code, or if +// you have issues compiling it, you can disable it entirely by +// defining STBI_NO_SIMD. +// +// =========================================================================== +// +// HDR image support (disable by defining STBI_NO_HDR) +// +// stb_image supports loading HDR images in general, and currently the Radiance +// .HDR file format specifically. You can still load any file through the existing +// interface; if you attempt to load an HDR file, it will be automatically remapped +// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; +// both of these constants can be reconfigured through this interface: +// +// stbi_hdr_to_ldr_gamma(2.2f); +// stbi_hdr_to_ldr_scale(1.0f); +// +// (note, do not use _inverse_ constants; stbi_image will invert them +// appropriately). +// +// Additionally, there is a new, parallel interface for loading files as +// (linear) floats to preserve the full dynamic range: +// +// float *data = stbi_loadf(filename, &x, &y, &n, 0); +// +// If you load LDR images through this interface, those images will +// be promoted to floating point values, run through the inverse of +// constants corresponding to the above: +// +// stbi_ldr_to_hdr_scale(1.0f); +// stbi_ldr_to_hdr_gamma(2.2f); +// +// Finally, given a filename (or an open file or memory block--see header +// file for details) containing image data, you can query for the "most +// appropriate" interface to use (that is, whether the image is HDR or +// not), using: +// +// stbi_is_hdr(char *filename); +// +// =========================================================================== +// +// iPhone PNG support: +// +// We optionally support converting iPhone-formatted PNGs (which store +// premultiplied BGRA) back to RGB, even though they're internally encoded +// differently. To enable this conversion, call +// stbi_convert_iphone_png_to_rgb(1). +// +// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per +// pixel to remove any premultiplied alpha *only* if the image file explicitly +// says there's premultiplied data (currently only happens in iPhone images, +// and only if iPhone convert-to-rgb processing is on). +// +// =========================================================================== +// +// ADDITIONAL CONFIGURATION +// +// - You can suppress implementation of any of the decoders to reduce +// your code footprint by #defining one or more of the following +// symbols before creating the implementation. +// +// STBI_NO_JPEG +// STBI_NO_PNG +// STBI_NO_BMP +// STBI_NO_PSD +// STBI_NO_TGA +// STBI_NO_GIF +// STBI_NO_HDR +// STBI_NO_PIC +// STBI_NO_PNM (.ppm and .pgm) +// +// - You can request *only* certain decoders and suppress all other ones +// (this will be more forward-compatible, as addition of new decoders +// doesn't require you to disable them explicitly): +// +// STBI_ONLY_JPEG +// STBI_ONLY_PNG +// STBI_ONLY_BMP +// STBI_ONLY_PSD +// STBI_ONLY_TGA +// STBI_ONLY_GIF +// STBI_ONLY_HDR +// STBI_ONLY_PIC +// STBI_ONLY_PNM (.ppm and .pgm) +// +// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still +// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB +// +// - If you define STBI_MAX_DIMENSIONS, stb_image will reject images greater +// than that size (in either width or height) without further processing. +// This is to let programs in the wild set an upper bound to prevent +// denial-of-service attacks on untrusted data, as one could generate a +// valid image of gigantic dimensions and force stb_image to allocate a +// huge block of memory and spend disproportionate time decoding it. By +// default this is set to (1 << 24), which is 16777216, but that's still +// very big. + +#ifndef STBI_NO_STDIO +#include +#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 +// on most compilers (and ALL modern mainstream compilers) this is threadsafe +STBIDEF const char *stbi_failure_reason (void); + +// free the loaded image -- this is just free() +STBIDEF void stbi_image_free (void *retval_from_stbi_load); + +// get image dimensions & components without fully decoding +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp); +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len); +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user); + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp); +STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); +STBIDEF int stbi_is_16_bit (char const *filename); +STBIDEF int stbi_is_16_bit_from_file(FILE *f); +#endif + + + +// for image formats that explicitly notate that they have premultiplied alpha, +// we just return the colors as stored in the file. set this flag to force +// unpremultiplication. results are undefined if the unpremultiply overflow. +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); + +// indicate whether we should process iphone images back to canonical format, +// or just pass them through "as-is" +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); + +// flip the image vertically, so the first pixel in the output array is the bottom left +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip); + +// as above, but only applies to images loaded on the thread that calls the function +// this function is only available if your compiler supports thread-local variables; +// calling it will fail to link if your compiler doesn't +STBIDEF void stbi_set_unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply); +STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert); +STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip); + +// ZLIB client - used by PNG, available for other purposes + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header); +STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); + +STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); + + +#ifdef __cplusplus +} +#endif + +// +// +//// end header file ///////////////////////////////////////////////////// +#endif // STBI_INCLUDE_STB_IMAGE_H + +#ifdef STB_IMAGE_IMPLEMENTATION + +#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \ +|| defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \ +|| defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \ +|| defined(STBI_ONLY_ZLIB) +#ifndef STBI_ONLY_JPEG +#define STBI_NO_JPEG +#endif +#ifndef STBI_ONLY_PNG +#define STBI_NO_PNG +#endif +#ifndef STBI_ONLY_BMP +#define STBI_NO_BMP +#endif +#ifndef STBI_ONLY_PSD +#define STBI_NO_PSD +#endif +#ifndef STBI_ONLY_TGA +#define STBI_NO_TGA +#endif +#ifndef STBI_ONLY_GIF +#define STBI_NO_GIF +#endif +#ifndef STBI_ONLY_HDR +#define STBI_NO_HDR +#endif +#ifndef STBI_ONLY_PIC +#define STBI_NO_PIC +#endif +#ifndef STBI_ONLY_PNM +#define STBI_NO_PNM +#endif +#endif + +#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB) +#define STBI_NO_ZLIB +#endif + + +#include +#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 + +#ifndef STBI_NO_THREAD_LOCALS +#if defined(__cplusplus) && __cplusplus >= 201103L +#define STBI_THREAD_LOCAL thread_local +#elif defined(__GNUC__) && __GNUC__ < 5 +#define STBI_THREAD_LOCAL __thread +#elif defined(_MSC_VER) +#define STBI_THREAD_LOCAL __declspec(thread) +#elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__) +#define STBI_THREAD_LOCAL _Thread_local +#endif + +#ifndef STBI_THREAD_LOCAL +#if defined(__GNUC__) +#define STBI_THREAD_LOCAL __thread +#endif +#endif +#endif + +#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) >> (-(y) & 31))) +#endif + +#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) +// ok +#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) +// ok +#else +#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." +#endif + +#ifndef STBI_MALLOC +#define STBI_MALLOC(sz) malloc(sz) +#define STBI_REALLOC(p,newsz) realloc(p,newsz) +#define STBI_FREE(p) free(p) +#endif + +#ifndef STBI_REALLOC_SIZED +#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) +#endif + +// x86/x64 detection +#if defined(__x86_64__) || defined(_M_X64) +#define STBI__X64_TARGET +#elif defined(__i386) || defined(_M_IX86) +#define STBI__X86_TARGET +#endif + +#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) +// gcc doesn't support sse2 intrinsics unless you compile with -msse2, +// which in turn means it gets to use SSE2 everywhere. This is unfortunate, +// but previous attempts to provide the SSE2 functions with runtime +// detection caused numerous issues. The way architecture extensions are +// exposed in GCC/Clang is, sadly, not really suited for one-file libs. +// New behavior: if compiled with -msse2, we use SSE2 without any +// detection; if not, we don't use it at all. +#define STBI_NO_SIMD +#endif + +#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) +// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET +// +// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the +// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. +// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not +// simultaneously enabling "-mstackrealign". +// +// See https://github.com/nothings/stb/issues/81 for more information. +// +// So default to no SSE2 on 32-bit MinGW. If you've read this far and added +// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. +#define STBI_NO_SIMD +#endif + +#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) +#define STBI_SSE2 +#include + +#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 +#ifdef _MSC_VER +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name +#else +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) +#endif +#endif + +#ifndef STBI_SIMD_ALIGN +#define STBI_SIMD_ALIGN(type, name) type name +#endif + +#ifndef STBI_MAX_DIMENSIONS +#define STBI_MAX_DIMENSIONS (1 << 24) +#endif + +/////////////////////////////////////////////// +// +// stbi__context struct and start_xxx functions + +// stbi__context structure is our basic context used by all images, so it +// contains all the IO context, plus some basic image information +typedef struct +{ +stbi__uint32 img_x, img_y; +int img_n, img_out_n; + +stbi_io_callbacks io; +void *io_user_data; + +int read_from_callbacks; +int buflen; +stbi_uc buffer_start[128]; +int callback_already_read; + +stbi_uc *img_buffer, *img_buffer_end; +stbi_uc *img_buffer_original, *img_buffer_original_end; +} stbi__context; + + +static void stbi__refill_buffer(stbi__context *s); + +// initialize a memory-decode context +static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len) +{ +s->io.read = NULL; +s->read_from_callbacks = 0; +s->callback_already_read = 0; +s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer; +s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len; +} + +// initialize a callback-based context +static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user) +{ +s->io = *c; +s->io_user_data = user; +s->buflen = sizeof(s->buffer_start); +s->read_from_callbacks = 1; +s->callback_already_read = 0; +s->img_buffer = s->img_buffer_original = s->buffer_start; +stbi__refill_buffer(s); +s->img_buffer_original_end = s->img_buffer_end; +} + +#ifndef STBI_NO_STDIO + +static int stbi__stdio_read(void *user, char *data, int size) +{ +return (int) fread(data,1,size,(FILE*) user); +} + +static void stbi__stdio_skip(void *user, int n) +{ +int ch; +fseek((FILE*) user, n, SEEK_CUR); +ch = fgetc((FILE*) user); /* have to read a byte to reset feof()'s flag */ +if (ch != EOF) { +ungetc(ch, (FILE *) user); /* push byte back onto stream if valid. */ +} +} + +static int stbi__stdio_eof(void *user) +{ +return feof((FILE*) user) || ferror((FILE *) user); +} + +static stbi_io_callbacks stbi__stdio_callbacks = +{ +stbi__stdio_read, +stbi__stdio_skip, +stbi__stdio_eof, +}; + +static void stbi__start_file(stbi__context *s, FILE *f) +{ +stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f); +} + +//static void stop_file(stbi__context *s) { } + +#endif // !STBI_NO_STDIO + +static void stbi__rewind(stbi__context *s) +{ +// conceptually rewind SHOULD rewind to the beginning of the stream, +// but we just rewind to the beginning of the initial buffer, because +// we only use it after doing 'test', which only ever looks at at most 92 bytes +s->img_buffer = s->img_buffer_original; +s->img_buffer_end = s->img_buffer_original_end; +} + +enum +{ +STBI_ORDER_RGB, +STBI_ORDER_BGR +}; + +typedef struct +{ +int bits_per_channel; +int num_channels; +int channel_order; +} stbi__result_info; + +#ifndef STBI_NO_JPEG +static int stbi__jpeg_test(stbi__context *s); +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNG +static int stbi__png_test(stbi__context *s); +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__png_is16(stbi__context *s); +#endif + +#ifndef STBI_NO_BMP +static int stbi__bmp_test(stbi__context *s); +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_TGA +static int stbi__tga_test(stbi__context *s); +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s); +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc); +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__psd_is16(stbi__context *s); +#endif + +#ifndef STBI_NO_HDR +static int stbi__hdr_test(stbi__context *s); +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_test(stbi__context *s); +static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_GIF +static int stbi__gif_test(stbi__context *s); +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp); +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp); +#endif + +#ifndef STBI_NO_PNM +static int stbi__pnm_test(stbi__context *s); +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri); +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp); +static int stbi__pnm_is16(stbi__context *s); +#endif + +static +#ifdef STBI_THREAD_LOCAL +STBI_THREAD_LOCAL +#endif +const char *stbi__g_failure_reason; + +STBIDEF const char *stbi_failure_reason(void) +{ +return stbi__g_failure_reason; +} + +#ifndef STBI_NO_FAILURE_STRINGS +static int stbi__err(const char *str) +{ +stbi__g_failure_reason = str; +return 0; +} +#endif + +static void *stbi__malloc(size_t size) +{ +return STBI_MALLOC(size); +} + +// stb_image uses ints pervasively, including for offset calculations. +// therefore the largest decoded image size we can support with the +// current code, even on 64-bit targets, is INT_MAX. this is not a +// significant limitation for the intended use case. +// +// we do, however, need to make sure our size calculations don't +// overflow. hence a few helper functions for size calculations that +// multiply integers together, making sure that they're non-negative +// and no overflow occurs. + +// return 1 if the sum is valid, 0 on overflow. +// negative terms are considered invalid. +static int stbi__addsizes_valid(int a, int b) +{ +if (b < 0) return 0; +// now 0 <= b <= INT_MAX, hence also +// 0 <= INT_MAX - b <= INTMAX. +// And "a + b <= INT_MAX" (which might overflow) is the +// same as a <= INT_MAX - b (no overflow) +return a <= INT_MAX - b; +} + +// returns 1 if the product is valid, 0 on overflow. +// negative factors are considered invalid. +static int stbi__mul2sizes_valid(int a, int b) +{ +if (a < 0 || b < 0) return 0; +if (b == 0) return 1; // mul-by-0 is always safe +// portable way to check for no overflows in a*b +return a <= INT_MAX/b; +} + +#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR) +// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow +static int stbi__mad2sizes_valid(int a, int b, int add) +{ +return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add); +} +#endif + +// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow +static int stbi__mad3sizes_valid(int a, int b, int c, int add) +{ +return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && +stbi__addsizes_valid(a*b*c, add); +} + +// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM) +static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add) +{ +return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) && +stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add); +} +#endif + +#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR) +// mallocs with size overflow checking +static void *stbi__malloc_mad2(int a, int b, int add) +{ +if (!stbi__mad2sizes_valid(a, b, add)) return NULL; +return stbi__malloc(a*b + add); +} +#endif + +static void *stbi__malloc_mad3(int a, int b, int c, int add) +{ +if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL; +return stbi__malloc(a*b*c + add); +} + +#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR) || !defined(STBI_NO_PNM) +static void *stbi__malloc_mad4(int a, int b, int c, int d, int add) +{ +if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL; +return stbi__malloc(a*b*c*d + add); +} +#endif + +// stbi__err - error +// stbi__errpf - error returning pointer to float +// stbi__errpuc - error returning pointer to unsigned char + +#ifdef STBI_NO_FAILURE_STRINGS +#define stbi__err(x,y) 0 +#elif defined(STBI_FAILURE_USERMSG) +#define stbi__err(x,y) stbi__err(y) +#else +#define stbi__err(x,y) stbi__err(x) +#endif + +#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL)) +#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL)) + +STBIDEF void stbi_image_free(void *retval_from_stbi_load) +{ +STBI_FREE(retval_from_stbi_load); +} + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp); +#endif + +#ifndef STBI_NO_HDR +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp); +#endif + +static int stbi__vertically_flip_on_load_global = 0; + +STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip) +{ +stbi__vertically_flip_on_load_global = flag_true_if_should_flip; +} + +#ifndef STBI_THREAD_LOCAL +#define stbi__vertically_flip_on_load stbi__vertically_flip_on_load_global +#else +static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set; + +STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip) +{ +stbi__vertically_flip_on_load_local = flag_true_if_should_flip; +stbi__vertically_flip_on_load_set = 1; +} + +#define stbi__vertically_flip_on_load (stbi__vertically_flip_on_load_set \ +? stbi__vertically_flip_on_load_local \ +: stbi__vertically_flip_on_load_global) +#endif // STBI_THREAD_LOCAL + +static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ +memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields +ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed +ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order +ri->num_channels = 0; + +// test the formats with a very explicit header first (at least a FOURCC +// or distinctive magic number first) +#ifndef STBI_NO_PNG +if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri); +#endif +#ifndef STBI_NO_BMP +if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri); +#endif +#ifndef STBI_NO_GIF +if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri); +#endif +#ifndef STBI_NO_PSD +if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc); +#else +STBI_NOTUSED(bpc); +#endif +#ifndef STBI_NO_PIC +if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri); +#endif + +// then the formats that can end up attempting to load with just 1 or 2 +// bytes matching expectations; these are prone to false positives, so +// try them later +#ifndef STBI_NO_JPEG +if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri); +#endif +#ifndef STBI_NO_PNM +if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri); +#endif + +#ifndef STBI_NO_HDR +if (stbi__hdr_test(s)) { +float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri); +return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); +} +#endif + +#ifndef STBI_NO_TGA +// test tga last because it's a crappy test! +if (stbi__tga_test(s)) +return stbi__tga_load(s,x,y,comp,req_comp, ri); +#endif + +return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt"); +} + +static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels) +{ +int i; +int img_len = w * h * channels; +stbi_uc *reduced; + +reduced = (stbi_uc *) stbi__malloc(img_len); +if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory"); + +for (i = 0; i < img_len; ++i) +reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling + +STBI_FREE(orig); +return reduced; +} + +static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels) +{ +int i; +int img_len = w * h * channels; +stbi__uint16 *enlarged; + +enlarged = (stbi__uint16 *) stbi__malloc(img_len*2); +if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); + +for (i = 0; i < img_len; ++i) +enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff + +STBI_FREE(orig); +return enlarged; +} + +static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel) +{ +int row; +size_t bytes_per_row = (size_t)w * bytes_per_pixel; +stbi_uc temp[2048]; +stbi_uc *bytes = (stbi_uc *)image; + +for (row = 0; row < (h>>1); row++) { +stbi_uc *row0 = bytes + row*bytes_per_row; +stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row; +// swap row0 with row1 +size_t bytes_left = bytes_per_row; +while (bytes_left) { +size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp); +memcpy(temp, row0, bytes_copy); +memcpy(row0, row1, bytes_copy); +memcpy(row1, temp, bytes_copy); +row0 += bytes_copy; +row1 += bytes_copy; +bytes_left -= bytes_copy; +} +} +} + +#ifndef STBI_NO_GIF +static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel) +{ +int slice; +int slice_size = w * h * bytes_per_pixel; + +stbi_uc *bytes = (stbi_uc *)image; +for (slice = 0; slice < z; ++slice) { +stbi__vertical_flip(bytes, w, h, bytes_per_pixel); +bytes += slice_size; +} +} +#endif + +static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ +stbi__result_info ri; +void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8); + +if (result == NULL) +return NULL; + +// it is the responsibility of the loaders to make sure we get either 8 or 16 bit. +STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16); + +if (ri.bits_per_channel != 8) { +result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp); +ri.bits_per_channel = 8; +} + +// @TODO: move stbi__convert_format to here + +if (stbi__vertically_flip_on_load) { +int channels = req_comp ? req_comp : *comp; +stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc)); +} + +return (unsigned char *) result; +} + +static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ +stbi__result_info ri; +void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16); + +if (result == NULL) +return NULL; + +// it is the responsibility of the loaders to make sure we get either 8 or 16 bit. +STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16); + +if (ri.bits_per_channel != 16) { +result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp); +ri.bits_per_channel = 16; +} + +// @TODO: move stbi__convert_format16 to here +// @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision + +if (stbi__vertically_flip_on_load) { +int channels = req_comp ? req_comp : *comp; +stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16)); +} + +return (stbi__uint16 *) result; +} + +#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR) +static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp) +{ +if (stbi__vertically_flip_on_load && result != NULL) { +int channels = req_comp ? req_comp : *comp; +stbi__vertical_flip(result, *x, *y, channels * sizeof(float)); +} +} +#endif + +#ifndef STBI_NO_STDIO + +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); +STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default); +#endif + +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) +{ +return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); +} +#endif + +static FILE *stbi__fopen(char const *filename, char const *mode) +{ +FILE *f; +#if defined(_WIN32) && defined(STBI_WINDOWS_UTF8) +wchar_t wMode[64]; +wchar_t wFilename[1024]; +if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)/sizeof(*wFilename))) +return 0; + +if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)/sizeof(*wMode))) +return 0; + +#if defined(_MSC_VER) && _MSC_VER >= 1400 +if (0 != _wfopen_s(&f, wFilename, wMode)) +f = 0; +#else +f = _wfopen(wFilename, wMode); +#endif + +#elif defined(_MSC_VER) && _MSC_VER >= 1400 +if (0 != fopen_s(&f, filename, mode)) +f=0; +#else +f = fopen(filename, mode); +#endif +return f; +} + + +STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ +FILE *f = stbi__fopen(filename, "rb"); +unsigned char *result; +if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); +result = stbi_load_from_file(f,x,y,comp,req_comp); +fclose(f); +return result; +} + +STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ +unsigned char *result; +stbi__context s; +stbi__start_file(&s,f); +result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +if (result) { +// need to 'unget' all the characters in the IO buffer +fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); +} +return result; +} + +STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) +{ +stbi__uint16 *result; +stbi__context s; +stbi__start_file(&s,f); +result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp); +if (result) { +// need to 'unget' all the characters in the IO buffer +fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); +} +return result; +} + +STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) +{ +FILE *f = stbi__fopen(filename, "rb"); +stbi__uint16 *result; +if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file"); +result = stbi_load_from_file_16(f,x,y,comp,req_comp); +fclose(f); +return result; +} + + +#endif //!STBI_NO_STDIO + +STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels) +{ +stbi__context s; +stbi__start_mem(&s,buffer,len); +return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); +} + +STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels) +{ +stbi__context s; +stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user); +return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); +} + +STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ +stbi__context s; +stbi__start_mem(&s,buffer,len); +return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ +stbi__context s; +stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); +return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_GIF +STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp) +{ +unsigned char *result; +stbi__context s; +stbi__start_mem(&s,buffer,len); + +result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp); +if (stbi__vertically_flip_on_load) { +stbi__vertical_flip_slices( result, *x, *y, *z, *comp ); +} + +return result; +} +#endif + +#ifndef STBI_NO_LINEAR +static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) +{ +unsigned char *data; +#ifndef STBI_NO_HDR +if (stbi__hdr_test(s)) { +stbi__result_info ri; +float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri); +if (hdr_data) +stbi__float_postprocess(hdr_data,x,y,comp,req_comp); +return hdr_data; +} +#endif +data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp); +if (data) +return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); +return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); +} + +STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ +stbi__context s; +stbi__start_mem(&s,buffer,len); +return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) +{ +stbi__context s; +stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); +return stbi__loadf_main(&s,x,y,comp,req_comp); +} + +#ifndef STBI_NO_STDIO +STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) +{ +float *result; +FILE *f = stbi__fopen(filename, "rb"); +if (!f) return stbi__errpf("can't fopen", "Unable to open file"); +result = stbi_loadf_from_file(f,x,y,comp,req_comp); +fclose(f); +return result; +} + +STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ +stbi__context s; +stbi__start_file(&s,f); +return stbi__loadf_main(&s,x,y,comp,req_comp); +} +#endif // !STBI_NO_STDIO + +#endif // !STBI_NO_LINEAR + +// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is +// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always +// reports false! + +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) +{ +#ifndef STBI_NO_HDR +stbi__context s; +stbi__start_mem(&s,buffer,len); +return stbi__hdr_test(&s); +#else +STBI_NOTUSED(buffer); +STBI_NOTUSED(len); +return 0; +#endif +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_is_hdr (char const *filename) +{ +FILE *f = stbi__fopen(filename, "rb"); +int result=0; +if (f) { +result = stbi_is_hdr_from_file(f); +fclose(f); +} +return result; +} + +STBIDEF int stbi_is_hdr_from_file(FILE *f) +{ +#ifndef STBI_NO_HDR +long pos = ftell(f); +int res; +stbi__context s; +stbi__start_file(&s,f); +res = stbi__hdr_test(&s); +fseek(f, pos, SEEK_SET); +return res; +#else +STBI_NOTUSED(f); +return 0; +#endif +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) +{ +#ifndef STBI_NO_HDR +stbi__context s; +stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); +return stbi__hdr_test(&s); +#else +STBI_NOTUSED(clbk); +STBI_NOTUSED(user); +return 0; +#endif +} + +#ifndef STBI_NO_LINEAR +static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; + +STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } +STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } +#endif + +static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; + +STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } +STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } + + +////////////////////////////////////////////////////////////////////////////// +// +// Common code used by all image loaders +// + +enum +{ +STBI__SCAN_load=0, +STBI__SCAN_type, +STBI__SCAN_header +}; + +static void stbi__refill_buffer(stbi__context *s) +{ +int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); +s->callback_already_read += (int) (s->img_buffer - s->img_buffer_original); +if (n == 0) { +// at end of file, treat same as if from memory, but need to handle case +// where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file +s->read_from_callbacks = 0; +s->img_buffer = s->buffer_start; +s->img_buffer_end = s->buffer_start+1; +*s->img_buffer = 0; +} else { +s->img_buffer = s->buffer_start; +s->img_buffer_end = s->buffer_start + n; +} +} + +stbi_inline static stbi_uc stbi__get8(stbi__context *s) +{ +if (s->img_buffer < s->img_buffer_end) +return *s->img_buffer++; +if (s->read_from_callbacks) { +stbi__refill_buffer(s); +return *s->img_buffer++; +} +return 0; +} + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +stbi_inline static int stbi__at_eof(stbi__context *s) +{ +if (s->io.read) { +if (!(s->io.eof)(s->io_user_data)) return 0; +// if feof() is true, check if buffer = end +// special case: we've only got the special 0 character at the end +if (s->read_from_callbacks == 0) return 1; +} + +return s->img_buffer >= s->img_buffer_end; +} +#endif + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) +// nothing +#else +static void stbi__skip(stbi__context *s, int n) +{ +if (n == 0) return; // already there! +if (n < 0) { +s->img_buffer = s->img_buffer_end; +return; +} +if (s->io.read) { +int blen = (int) (s->img_buffer_end - s->img_buffer); +if (blen < n) { +s->img_buffer = s->img_buffer_end; +(s->io.skip)(s->io_user_data, n - blen); +return; +} +} +s->img_buffer += n; +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM) +// nothing +#else +static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n) +{ +if (s->io.read) { +int blen = (int) (s->img_buffer_end - s->img_buffer); +if (blen < n) { +int res, count; + +memcpy(buffer, s->img_buffer, blen); + +count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen); +res = (count == (n-blen)); +s->img_buffer = s->img_buffer_end; +return res; +} +} + +if (s->img_buffer+n <= s->img_buffer_end) { +memcpy(buffer, s->img_buffer, n); +s->img_buffer += n; +return 1; +} else +return 0; +} +#endif + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC) +// nothing +#else +static int stbi__get16be(stbi__context *s) +{ +int z = stbi__get8(s); +return (z << 8) + stbi__get8(s); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC) +// nothing +#else +static stbi__uint32 stbi__get32be(stbi__context *s) +{ +stbi__uint32 z = stbi__get16be(s); +return (z << 16) + stbi__get16be(s); +} +#endif + +#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) +// nothing +#else +static int stbi__get16le(stbi__context *s) +{ +int z = stbi__get8(s); +return z + (stbi__get8(s) << 8); +} +#endif + +#ifndef STBI_NO_BMP +static stbi__uint32 stbi__get32le(stbi__context *s) +{ +stbi__uint32 z = stbi__get16le(s); +z += (stbi__uint32)stbi__get16le(s) << 16; +return z; +} +#endif + +#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings + +#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +////////////////////////////////////////////////////////////////////////////// +// +// generic converter from built-in img_n to req_comp +// individual types do this automatically as much as possible (e.g. jpeg +// does all cases internally since it needs to colorspace convert anyway, +// and it never has alpha, so very few cases ). png can automatically +// interleave an alpha=255 channel, but falls back to this for other cases +// +// assume data buffer is malloced, so malloc a new one and free that one +// only failure mode is malloc failing + +static stbi_uc stbi__compute_y(int r, int g, int b) +{ +return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM) +// nothing +#else +static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ +int i,j; +unsigned char *good; + +if (req_comp == img_n) return data; +STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + +good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0); +if (good == NULL) { +STBI_FREE(data); +return stbi__errpuc("outofmem", "Out of memory"); +} + +for (j=0; j < (int) y; ++j) { +unsigned char *src = data + j * x * img_n ; +unsigned char *dest = good + j * x * req_comp; + +#define STBI__COMBO(a,b) ((a)*8+(b)) +#define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) +// convert source image with img_n components to one with req_comp components; +// avoid switch per pixel, so use switch per scanline and massive macros +switch (STBI__COMBO(img_n, req_comp)) { +STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=255; } break; +STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; +STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=255; } break; +STBI__CASE(2,1) { dest[0]=src[0]; } break; +STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; +STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break; +STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=255; } break; +STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; +STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = 255; } break; +STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break; +STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = src[3]; } break; +STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break; +default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return stbi__errpuc("unsupported", "Unsupported format conversion"); +} +#undef STBI__CASE +} + +STBI_FREE(data); +return good; +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) +// nothing +#else +static stbi__uint16 stbi__compute_y_16(int r, int g, int b) +{ +return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8); +} +#endif + +#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) +// nothing +#else +static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y) +{ +int i,j; +stbi__uint16 *good; + +if (req_comp == img_n) return data; +STBI_ASSERT(req_comp >= 1 && req_comp <= 4); + +good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2); +if (good == NULL) { +STBI_FREE(data); +return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory"); +} + +for (j=0; j < (int) y; ++j) { +stbi__uint16 *src = data + j * x * img_n ; +stbi__uint16 *dest = good + j * x * req_comp; + +#define STBI__COMBO(a,b) ((a)*8+(b)) +#define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) +// convert source image with img_n components to one with req_comp components; +// avoid switch per pixel, so use switch per scanline and massive macros +switch (STBI__COMBO(img_n, req_comp)) { +STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=0xffff; } break; +STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; +STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=0xffff; } break; +STBI__CASE(2,1) { dest[0]=src[0]; } break; +STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break; +STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1]; } break; +STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=0xffff; } break; +STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; +STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = 0xffff; } break; +STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break; +STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = src[3]; } break; +STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2]; } break; +default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return (stbi__uint16*) stbi__errpuc("unsupported", "Unsupported format conversion"); +} +#undef STBI__CASE +} + +STBI_FREE(data); +return good; +} +#endif + +#ifndef STBI_NO_LINEAR +static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp) +{ +int i,k,n; +float *output; +if (!data) return NULL; +output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0); +if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); } +// compute number of non-alpha components +if (comp & 1) n = comp; else n = comp-1; +for (i=0; i < x*y; ++i) { +for (k=0; k < n; ++k) { +output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale); +} +} +if (n < comp) { +for (i=0; i < x*y; ++i) { +output[i*comp + n] = data[i*comp + n]/255.0f; +} +} +STBI_FREE(data); +return output; +} +#endif + +#ifndef STBI_NO_HDR +#define stbi__float2int(x) ((int) (x)) +static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp) +{ +int i,k,n; +stbi_uc *output; +if (!data) return NULL; +output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0); +if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); } +// compute number of non-alpha components +if (comp & 1) n = comp; else n = comp-1; +for (i=0; i < x*y; ++i) { +for (k=0; k < n; ++k) { +float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f; +if (z < 0) z = 0; +if (z > 255) z = 255; +output[i*comp + k] = (stbi_uc) stbi__float2int(z); +} +if (k < comp) { +float z = data[i*comp+k] * 255 + 0.5f; +if (z < 0) z = 0; +if (z > 255) z = 255; +output[i*comp + k] = (stbi_uc) stbi__float2int(z); +} +} +STBI_FREE(data); +return output; +} +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// "baseline" JPEG/JFIF decoder +// +// simple implementation +// - doesn't support delayed output of y-dimension +// - simple interface (only one output format: 8-bit interleaved RGB) +// - doesn't try to recover corrupt jpegs +// - doesn't allow partial loading, loading multiple at once +// - still fast on x86 (copying globals into locals doesn't help x86) +// - allocates lots of intermediate memory (full size of all components) +// - non-interleaved case requires this anyway +// - allows good upsampling (see next) +// high-quality +// - upsampled channels are bilinearly interpolated, even across blocks +// - quality integer IDCT derived from IJG's 'slow' +// performance +// - fast huffman; reasonable integer IDCT +// - some SIMD kernels for common paths on targets with SSE2/NEON +// - uses a lot of intermediate memory, could cache poorly + +#ifndef STBI_NO_JPEG + +// huffman decoding acceleration +#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache + +typedef struct +{ +stbi_uc fast[1 << FAST_BITS]; +// weirdly, repacking this into AoS is a 10% speed loss, instead of a win +stbi__uint16 code[256]; +stbi_uc values[256]; +stbi_uc size[257]; +unsigned int maxcode[18]; +int delta[17]; // old 'firstsymbol' - old 'firstcode' +} stbi__huffman; + +typedef struct +{ +stbi__context *s; +stbi__huffman huff_dc[4]; +stbi__huffman huff_ac[4]; +stbi__uint16 dequant[4][64]; +stbi__int16 fast_ac[4][1 << FAST_BITS]; + +// sizes for components, interleaved MCUs +int img_h_max, img_v_max; +int img_mcu_x, img_mcu_y; +int img_mcu_w, img_mcu_h; + +// definition of jpeg image component +struct +{ +int id; +int h,v; +int tq; +int hd,ha; +int dc_pred; + +int x,y,w2,h2; +stbi_uc *data; +void *raw_data, *raw_coeff; +stbi_uc *linebuf; +short *coeff; // progressive only +int coeff_w, coeff_h; // number of 8x8 coefficient blocks +} img_comp[4]; + +stbi__uint32 code_buffer; // jpeg entropy-coded buffer +int code_bits; // number of valid bits +unsigned char marker; // marker seen while filling entropy buffer +int nomore; // flag if we saw a marker so must stop + +int progressive; +int spec_start; +int spec_end; +int succ_high; +int succ_low; +int eob_run; +int jfif; +int app14_color_transform; // Adobe APP14 tag +int rgb; + +int scan_n, order[4]; +int restart_interval, todo; + +// kernels +void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]); +void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step); +stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs); +} stbi__jpeg; + +static int stbi__build_huffman(stbi__huffman *h, int *count) +{ +int i,j,k=0; +unsigned int code; +// build size list for each symbol (from JPEG spec) +for (i=0; i < 16; ++i) +for (j=0; j < count[i]; ++j) +h->size[k++] = (stbi_uc) (i+1); +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 = j->code_buffer >> 31; // sign bit always in MSB; 0 if MSB clear (positive), 1 if MSB set (negative) +k = stbi_lrot(j->code_buffer, n); +j->code_buffer = k & ~stbi__bmask[n]; +k &= stbi__bmask[n]; +j->code_bits -= n; +return k + (stbi__jbias[n] & (sgn - 1)); +} + +// get some unsigned bits +stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) +{ +unsigned int k; +if (j->code_bits < n) stbi__grow_buffer_unsafe(j); +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 || t > 15) return stbi__err("bad huffman code","Corrupt JPEG"); + +// 0 all the ac values now so we can do it 32-bits at a time +memset(data,0,64*sizeof(data[0])); + +diff = t ? stbi__extend_receive(j, t) : 0; +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); +if (t < 0 || t > 15) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); +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 * (1 << j->succ_low)); +} else { +// refinement scan for DC coefficient +if (stbi__jpeg_get_bit(j)) +data[0] += (short) (1 << j->succ_low); +} +return 1; +} + +// @OPTIMIZE: store non-zigzagged during the decode passes, +// and only de-zigzag when dequantizing +static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac) +{ +int k; +if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); + +if (j->succ_high == 0) { +int shift = j->succ_low; + +if (j->eob_run) { +--j->eob_run; +return 1; +} + +k = j->spec_start; +do { +unsigned int zig; +int c,r,s; +if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); +c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); +r = fac[c]; +if (r) { // fast-AC path +k += (r >> 4) & 15; // run +s = r & 15; // combined length +j->code_buffer <<= s; +j->code_bits -= s; +zig = stbi__jpeg_dezigzag[k++]; +data[zig] = (short) ((r >> 8) * (1 << shift)); +} else { +int rs = stbi__jpeg_huff_decode(j, hac); +if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); +s = rs & 15; +r = rs >> 4; +if (s == 0) { +if (r < 15) { +j->eob_run = (1 << r); +if (r) +j->eob_run += stbi__jpeg_get_bits(j, r); +--j->eob_run; +break; +} +k += 16; +} else { +k += r; +zig = stbi__jpeg_dezigzag[k++]; +data[zig] = (short) (stbi__extend_receive(j,s) * (1 << shift)); +} +} +} while (k <= j->spec_end); +} else { +// refinement scan for these AC coefficients + +short bit = (short) (1 << j->succ_low); + +if (j->eob_run) { +--j->eob_run; +for (k = j->spec_start; k <= j->spec_end; ++k) { +short *p = &data[stbi__jpeg_dezigzag[k]]; +if (*p != 0) +if (stbi__jpeg_get_bit(j)) +if ((*p & bit)==0) { +if (*p > 0) +*p += bit; +else +*p -= bit; +} +} +} else { +k = j->spec_start; +do { +int r,s; +int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh +if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); +s = rs & 15; +r = rs >> 4; +if (s == 0) { +if (r < 15) { +j->eob_run = (1 << r) - 1; +if (r) +j->eob_run += stbi__jpeg_get_bits(j, r); +r = 64; // force end of block +} else { +// r=15 s=0 should write 16 0s, so we just do +// a run of 15 0s and then write s (which is 0), +// so we don't have to do anything special here +} +} else { +if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); +// sign bit +if (stbi__jpeg_get_bit(j)) +s = bit; +else +s = -bit; +} + +// advance by r +while (k <= j->spec_end) { +short *p = &data[stbi__jpeg_dezigzag[k++]]; +if (*p != 0) { +if (stbi__jpeg_get_bit(j)) +if ((*p & bit)==0) { +if (*p > 0) +*p += bit; +else +*p -= bit; +} +} else { +if (r == 0) { +*p = (short) s; +break; +} +--r; +} +} +} while (k <= j->spec_end); +} +} +return 1; +} + +// take a -128..127 value and stbi__clamp it and convert to 0..255 +stbi_inline static stbi_uc stbi__clamp(int x) +{ +// trick to use a single test to catch both cases +if ((unsigned int) x > 255) { +if (x < 0) return 0; +if (x > 255) return 255; +} +return (stbi_uc) x; +} + +#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) +#define stbi__fsh(x) ((x) * 4096) + +// derived from jidctint -- DCT_ISLOW +#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ +int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ +p2 = s2; \ +p3 = s6; \ +p1 = (p2+p3) * stbi__f2f(0.5411961f); \ +t2 = p1 + p3*stbi__f2f(-1.847759065f); \ +t3 = p1 + p2*stbi__f2f( 0.765366865f); \ +p2 = s0; \ +p3 = s4; \ +t0 = stbi__fsh(p2+p3); \ +t1 = stbi__fsh(p2-p3); \ +x0 = t0+t3; \ +x3 = t0-t3; \ +x1 = t1+t2; \ +x2 = t1-t2; \ +t0 = s7; \ +t1 = s5; \ +t2 = s3; \ +t3 = s1; \ +p3 = t0+t2; \ +p4 = t1+t3; \ +p1 = t0+t3; \ +p2 = t1+t2; \ +p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ +t0 = t0*stbi__f2f( 0.298631336f); \ +t1 = t1*stbi__f2f( 2.053119869f); \ +t2 = t2*stbi__f2f( 3.072711026f); \ +t3 = t3*stbi__f2f( 1.501321110f); \ +p1 = p5 + p1*stbi__f2f(-0.899976223f); \ +p2 = p5 + p2*stbi__f2f(-2.562915447f); \ +p3 = p3*stbi__f2f(-1.961570560f); \ +p4 = p4*stbi__f2f(-0.390180644f); \ +t3 += p1+p4; \ +t2 += p2+p3; \ +t1 += p2+p4; \ +t0 += p1+p3; + +static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) +{ +int i,val[64],*v=val; +stbi_uc *o; +short *d = data; + +// columns +for (i=0; i < 8; ++i,++d, ++v) { +// if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing +if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 +&& d[40]==0 && d[48]==0 && d[56]==0) { +// no shortcut 0 seconds +// (1|2|3|4|5|6|7)==0 0 seconds +// all separate -0.047 seconds +// 1 && 2|3 && 4|5 && 6|7: -0.047 seconds +int dcterm = d[0]*4; +v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; +} else { +STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) +// constants scaled things up by 1<<12; let's bring them back +// down, but keep 2 extra bits of precision +x0 += 512; x1 += 512; x2 += 512; x3 += 512; +v[ 0] = (x0+t3) >> 10; +v[56] = (x0-t3) >> 10; +v[ 8] = (x1+t2) >> 10; +v[48] = (x1-t2) >> 10; +v[16] = (x2+t1) >> 10; +v[40] = (x2-t1) >> 10; +v[24] = (x3+t0) >> 10; +v[32] = (x3-t0) >> 10; +} +} + +for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { +// no fast case since the first 1D IDCT spread components out +STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) +// constants scaled things up by 1<<12, plus we had 1<<2 from first +// loop, plus horizontal and vertical each scale by sqrt(8) so together +// we've got an extra 1<<3, so 1<<17 total we need to remove. +// so we want to round that, which means adding 0.5 * 1<<17, +// aka 65536. Also, we'll end up with -128 to 127 that we want +// to encode as 0..255 by adding 128, so we'll add that before the shift +x0 += 65536 + (128<<17); +x1 += 65536 + (128<<17); +x2 += 65536 + (128<<17); +x3 += 65536 + (128<<17); +// tried computing the shifts into temps, or'ing the temps to see +// if any were out of range, but that was slower +o[0] = stbi__clamp((x0+t3) >> 17); +o[7] = stbi__clamp((x0-t3) >> 17); +o[1] = stbi__clamp((x1+t2) >> 17); +o[6] = stbi__clamp((x1-t2) >> 17); +o[2] = stbi__clamp((x2+t1) >> 17); +o[5] = stbi__clamp((x2-t1) >> 17); +o[3] = stbi__clamp((x3+t0) >> 17); +o[4] = stbi__clamp((x3-t0) >> 17); +} +} + +#ifdef STBI_SSE2 +// sse2 integer IDCT. not the fastest possible implementation but it +// produces bit-identical results to the generic C version so it's +// fully "transparent". +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ +// This is constructed to match our regular (generic) integer IDCT exactly. +__m128i row0, row1, row2, row3, row4, row5, row6, row7; +__m128i tmp; + +// dot product constant: even elems=x, odd elems=y +#define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) + +// out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) +// out(1) = c1[even]*x + c1[odd]*y +#define dct_rot(out0,out1, x,y,c0,c1) \ +__m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ +__m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ +__m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ +__m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ +__m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ +__m128i out1##_h = _mm_madd_epi16(c0##hi, c1) + +// out = in << 12 (in 16-bit, out 32-bit) +#define dct_widen(out, in) \ +__m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ +__m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) + +// wide add +#define dct_wadd(out, a, b) \ +__m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ +__m128i out##_h = _mm_add_epi32(a##_h, b##_h) + +// wide sub +#define dct_wsub(out, a, b) \ +__m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ +__m128i out##_h = _mm_sub_epi32(a##_h, b##_h) + +// butterfly a/b, add bias, then shift by "s" and pack +#define dct_bfly32o(out0, out1, a,b,bias,s) \ +{ \ +__m128i abiased_l = _mm_add_epi32(a##_l, bias); \ +__m128i abiased_h = _mm_add_epi32(a##_h, bias); \ +dct_wadd(sum, abiased, b); \ +dct_wsub(dif, abiased, b); \ +out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ +out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ +} + +// 8-bit interleave step (for transposes) +#define dct_interleave8(a, b) \ +tmp = a; \ +a = _mm_unpacklo_epi8(a, b); \ +b = _mm_unpackhi_epi8(tmp, b) + +// 16-bit interleave step (for transposes) +#define dct_interleave16(a, b) \ +tmp = a; \ +a = _mm_unpacklo_epi16(a, b); \ +b = _mm_unpackhi_epi16(tmp, b) + +#define dct_pass(bias,shift) \ +{ \ +/* even part */ \ +dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ +__m128i sum04 = _mm_add_epi16(row0, row4); \ +__m128i dif04 = _mm_sub_epi16(row0, row4); \ +dct_widen(t0e, sum04); \ +dct_widen(t1e, dif04); \ +dct_wadd(x0, t0e, t3e); \ +dct_wsub(x3, t0e, t3e); \ +dct_wadd(x1, t1e, t2e); \ +dct_wsub(x2, t1e, t2e); \ +/* odd part */ \ +dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ +dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ +__m128i sum17 = _mm_add_epi16(row1, row7); \ +__m128i sum35 = _mm_add_epi16(row3, row5); \ +dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ +dct_wadd(x4, y0o, y4o); \ +dct_wadd(x5, y1o, y5o); \ +dct_wadd(x6, y2o, y5o); \ +dct_wadd(x7, y3o, y4o); \ +dct_bfly32o(row0,row7, x0,x7,bias,shift); \ +dct_bfly32o(row1,row6, x1,x6,bias,shift); \ +dct_bfly32o(row2,row5, x2,x5,bias,shift); \ +dct_bfly32o(row3,row4, x3,x4,bias,shift); \ +} + +__m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); +__m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); +__m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); +__m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); +__m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); +__m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); +__m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); +__m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); + +// rounding biases in column/row passes, see stbi__idct_block for explanation. +__m128i bias_0 = _mm_set1_epi32(512); +__m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); + +// load +row0 = _mm_load_si128((const __m128i *) (data + 0*8)); +row1 = _mm_load_si128((const __m128i *) (data + 1*8)); +row2 = _mm_load_si128((const __m128i *) (data + 2*8)); +row3 = _mm_load_si128((const __m128i *) (data + 3*8)); +row4 = _mm_load_si128((const __m128i *) (data + 4*8)); +row5 = _mm_load_si128((const __m128i *) (data + 5*8)); +row6 = _mm_load_si128((const __m128i *) (data + 6*8)); +row7 = _mm_load_si128((const __m128i *) (data + 7*8)); + +// column pass +dct_pass(bias_0, 10); + +{ +// 16bit 8x8 transpose pass 1 +dct_interleave16(row0, row4); +dct_interleave16(row1, row5); +dct_interleave16(row2, row6); +dct_interleave16(row3, row7); + +// transpose pass 2 +dct_interleave16(row0, row2); +dct_interleave16(row1, row3); +dct_interleave16(row4, row6); +dct_interleave16(row5, row7); + +// transpose pass 3 +dct_interleave16(row0, row1); +dct_interleave16(row2, row3); +dct_interleave16(row4, row5); +dct_interleave16(row6, row7); +} + +// row pass +dct_pass(bias_1, 17); + +{ +// pack +__m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 +__m128i p1 = _mm_packus_epi16(row2, row3); +__m128i p2 = _mm_packus_epi16(row4, row5); +__m128i p3 = _mm_packus_epi16(row6, row7); + +// 8bit 8x8 transpose pass 1 +dct_interleave8(p0, p2); // a0e0a1e1... +dct_interleave8(p1, p3); // c0g0c1g1... + +// transpose pass 2 +dct_interleave8(p0, p1); // a0c0e0g0... +dct_interleave8(p2, p3); // b0d0f0h0... + +// transpose pass 3 +dct_interleave8(p0, p2); // a0b0c0d0... +dct_interleave8(p1, p3); // a4b4c4d4... + +// store +_mm_storel_epi64((__m128i *) out, p0); out += out_stride; +_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; +_mm_storel_epi64((__m128i *) out, p2); out += out_stride; +_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; +_mm_storel_epi64((__m128i *) out, p1); out += out_stride; +_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; +_mm_storel_epi64((__m128i *) out, p3); out += out_stride; +_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); +} + +#undef dct_const +#undef dct_rot +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_interleave8 +#undef dct_interleave16 +#undef dct_pass +} + +#endif // STBI_SSE2 + +#ifdef STBI_NEON + +// NEON integer IDCT. should produce bit-identical +// results to the generic C version. +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) +{ +int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; + +int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); +int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); +int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); +int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); +int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); +int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); +int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); +int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); +int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); +int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); +int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); +int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); + +#define dct_long_mul(out, inq, coeff) \ +int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ +int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) + +#define dct_long_mac(out, acc, inq, coeff) \ +int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ +int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) + +#define dct_widen(out, inq) \ +int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ +int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) + +// wide add +#define dct_wadd(out, a, b) \ +int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ +int32x4_t out##_h = vaddq_s32(a##_h, b##_h) + +// wide sub +#define dct_wsub(out, a, b) \ +int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ +int32x4_t out##_h = vsubq_s32(a##_h, b##_h) + +// butterfly a/b, then shift using "shiftop" by "s" and pack +#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ +{ \ +dct_wadd(sum, a, b); \ +dct_wsub(dif, a, b); \ +out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ +out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ +} + +#define dct_pass(shiftop, shift) \ +{ \ +/* even part */ \ +int16x8_t sum26 = vaddq_s16(row2, row6); \ +dct_long_mul(p1e, sum26, rot0_0); \ +dct_long_mac(t2e, p1e, row6, rot0_1); \ +dct_long_mac(t3e, p1e, row2, rot0_2); \ +int16x8_t sum04 = vaddq_s16(row0, row4); \ +int16x8_t dif04 = vsubq_s16(row0, row4); \ +dct_widen(t0e, sum04); \ +dct_widen(t1e, dif04); \ +dct_wadd(x0, t0e, t3e); \ +dct_wsub(x3, t0e, t3e); \ +dct_wadd(x1, t1e, t2e); \ +dct_wsub(x2, t1e, t2e); \ +/* odd part */ \ +int16x8_t sum15 = vaddq_s16(row1, row5); \ +int16x8_t sum17 = vaddq_s16(row1, row7); \ +int16x8_t sum35 = vaddq_s16(row3, row5); \ +int16x8_t sum37 = vaddq_s16(row3, row7); \ +int16x8_t sumodd = vaddq_s16(sum17, sum35); \ +dct_long_mul(p5o, sumodd, rot1_0); \ +dct_long_mac(p1o, p5o, sum17, rot1_1); \ +dct_long_mac(p2o, p5o, sum35, rot1_2); \ +dct_long_mul(p3o, sum37, rot2_0); \ +dct_long_mul(p4o, sum15, rot2_1); \ +dct_wadd(sump13o, p1o, p3o); \ +dct_wadd(sump24o, p2o, p4o); \ +dct_wadd(sump23o, p2o, p3o); \ +dct_wadd(sump14o, p1o, p4o); \ +dct_long_mac(x4, sump13o, row7, rot3_0); \ +dct_long_mac(x5, sump24o, row5, rot3_1); \ +dct_long_mac(x6, sump23o, row3, rot3_2); \ +dct_long_mac(x7, sump14o, row1, rot3_3); \ +dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ +dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ +dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ +dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ +} + +// load +row0 = vld1q_s16(data + 0*8); +row1 = vld1q_s16(data + 1*8); +row2 = vld1q_s16(data + 2*8); +row3 = vld1q_s16(data + 3*8); +row4 = vld1q_s16(data + 4*8); +row5 = vld1q_s16(data + 5*8); +row6 = vld1q_s16(data + 6*8); +row7 = vld1q_s16(data + 7*8); + +// add DC bias +row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); + +// column pass +dct_pass(vrshrn_n_s32, 10); + +// 16bit 8x8 transpose +{ +// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. +// whether compilers actually get this is another story, sadly. +#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } +#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } + +// pass 1 +dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 +dct_trn16(row2, row3); +dct_trn16(row4, row5); +dct_trn16(row6, row7); + +// pass 2 +dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 +dct_trn32(row1, row3); +dct_trn32(row4, row6); +dct_trn32(row5, row7); + +// pass 3 +dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 +dct_trn64(row1, row5); +dct_trn64(row2, row6); +dct_trn64(row3, row7); + +#undef dct_trn16 +#undef dct_trn32 +#undef dct_trn64 +} + +// row pass +// vrshrn_n_s32 only supports shifts up to 16, we need +// 17. so do a non-rounding shift of 16 first then follow +// up with a rounding shift by 1. +dct_pass(vshrn_n_s32, 16); + +{ +// pack and round +uint8x8_t p0 = vqrshrun_n_s16(row0, 1); +uint8x8_t p1 = vqrshrun_n_s16(row1, 1); +uint8x8_t p2 = vqrshrun_n_s16(row2, 1); +uint8x8_t p3 = vqrshrun_n_s16(row3, 1); +uint8x8_t p4 = vqrshrun_n_s16(row4, 1); +uint8x8_t p5 = vqrshrun_n_s16(row5, 1); +uint8x8_t p6 = vqrshrun_n_s16(row6, 1); +uint8x8_t p7 = vqrshrun_n_s16(row7, 1); + +// again, these can translate into one instruction, but often don't. +#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } +#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } +#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } + +// sadly can't use interleaved stores here since we only write +// 8 bytes to each scan line! + +// 8x8 8-bit transpose pass 1 +dct_trn8_8(p0, p1); +dct_trn8_8(p2, p3); +dct_trn8_8(p4, p5); +dct_trn8_8(p6, p7); + +// pass 2 +dct_trn8_16(p0, p2); +dct_trn8_16(p1, p3); +dct_trn8_16(p4, p6); +dct_trn8_16(p5, p7); + +// pass 3 +dct_trn8_32(p0, p4); +dct_trn8_32(p1, p5); +dct_trn8_32(p2, p6); +dct_trn8_32(p3, p7); + +// store +vst1_u8(out, p0); out += out_stride; +vst1_u8(out, p1); out += out_stride; +vst1_u8(out, p2); out += out_stride; +vst1_u8(out, p3); out += out_stride; +vst1_u8(out, p4); out += out_stride; +vst1_u8(out, p5); out += out_stride; +vst1_u8(out, p6); out += out_stride; +vst1_u8(out, p7); + +#undef dct_trn8_8 +#undef dct_trn8_16 +#undef dct_trn8_32 +} + +#undef dct_long_mul +#undef dct_long_mac +#undef dct_widen +#undef dct_wadd +#undef dct_wsub +#undef dct_bfly32o +#undef dct_pass +} + +#endif // STBI_NEON + +#define STBI__MARKER_none 0xff +// if there's a pending marker from the entropy stream, return that +// otherwise, fetch from the stream and get a marker. if there's no +// marker, return 0xff, which is never a valid marker value +static stbi_uc stbi__get_marker(stbi__jpeg *j) +{ +stbi_uc x; +if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } +x = stbi__get8(j->s); +if (x != 0xff) return STBI__MARKER_none; +while (x == 0xff) +x = stbi__get8(j->s); // consume repeated 0xff fill bytes +return x; +} + +// in each scan, we'll have scan_n components, and the order +// of the components is specified by order[] +#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) + +// after a restart interval, stbi__jpeg_reset the entropy decoder and +// the dc prediction +static void stbi__jpeg_reset(stbi__jpeg *j) +{ +j->code_bits = 0; +j->code_buffer = 0; +j->nomore = 0; +j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0; +j->marker = STBI__MARKER_none; +j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; +j->eob_run = 0; +// no more than 1<<31 MCUs if no restart_interal? that's plenty safe, +// since we don't even allow 1<<30 pixels +} + +static int stbi__parse_entropy_coded_data(stbi__jpeg *z) +{ +stbi__jpeg_reset(z); +if (!z->progressive) { +if (z->scan_n == 1) { +int i,j; +STBI_SIMD_ALIGN(short, data[64]); +int n = z->order[0]; +// non-interleaved data, we just need to process one block at a time, +// in trivial scanline order +// number of blocks to do just depends on how many actual "pixels" this +// component has, independent of interleaved MCU blocking and such +int w = (z->img_comp[n].x+7) >> 3; +int h = (z->img_comp[n].y+7) >> 3; +for (j=0; j < h; ++j) { +for (i=0; i < w; ++i) { +int ha = z->img_comp[n].ha; +if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; +z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); +// every data block is an MCU, so countdown the restart interval +if (--z->todo <= 0) { +if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); +// if it's NOT a restart, then just bail, so we get corrupt data +// rather than no data +if (!STBI__RESTART(z->marker)) return 1; +stbi__jpeg_reset(z); +} +} +} +return 1; +} else { // interleaved +int i,j,k,x,y; +STBI_SIMD_ALIGN(short, data[64]); +for (j=0; j < z->img_mcu_y; ++j) { +for (i=0; i < z->img_mcu_x; ++i) { +// scan an interleaved mcu... process scan_n components in order +for (k=0; k < z->scan_n; ++k) { +int n = z->order[k]; +// scan out an mcu's worth of this component; that's just determined +// by the basic H and V specified for the component +for (y=0; y < z->img_comp[n].v; ++y) { +for (x=0; x < z->img_comp[n].h; ++x) { +int x2 = (i*z->img_comp[n].h + x)*8; +int y2 = (j*z->img_comp[n].v + y)*8; +int ha = z->img_comp[n].ha; +if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; +z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); +} +} +} +// after all interleaved components, that's an interleaved MCU, +// so now count down the restart interval +if (--z->todo <= 0) { +if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); +if (!STBI__RESTART(z->marker)) return 1; +stbi__jpeg_reset(z); +} +} +} +return 1; +} +} else { +if (z->scan_n == 1) { +int i,j; +int n = z->order[0]; +// non-interleaved data, we just need to process one block at a time, +// in trivial scanline order +// number of blocks to do just depends on how many actual "pixels" this +// component has, independent of interleaved MCU blocking and such +int w = (z->img_comp[n].x+7) >> 3; +int h = (z->img_comp[n].y+7) >> 3; +for (j=0; j < h; ++j) { +for (i=0; i < w; ++i) { +short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); +if (z->spec_start == 0) { +if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) +return 0; +} else { +int ha = z->img_comp[n].ha; +if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) +return 0; +} +// every data block is an MCU, so countdown the restart interval +if (--z->todo <= 0) { +if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); +if (!STBI__RESTART(z->marker)) return 1; +stbi__jpeg_reset(z); +} +} +} +return 1; +} else { // interleaved +int i,j,k,x,y; +for (j=0; j < z->img_mcu_y; ++j) { +for (i=0; i < z->img_mcu_x; ++i) { +// scan an interleaved mcu... process scan_n components in order +for (k=0; k < z->scan_n; ++k) { +int n = z->order[k]; +// scan out an mcu's worth of this component; that's just determined +// by the basic H and V specified for the component +for (y=0; y < z->img_comp[n].v; ++y) { +for (x=0; x < z->img_comp[n].h; ++x) { +int x2 = (i*z->img_comp[n].h + x); +int y2 = (j*z->img_comp[n].v + y); +short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); +if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) +return 0; +} +} +} +// after all interleaved components, that's an interleaved MCU, +// so now count down the restart interval +if (--z->todo <= 0) { +if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); +if (!STBI__RESTART(z->marker)) return 1; +stbi__jpeg_reset(z); +} +} +} +return 1; +} +} +} + +static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant) +{ +int i; +for (i=0; i < 64; ++i) +data[i] *= dequant[i]; +} + +static void stbi__jpeg_finish(stbi__jpeg *z) +{ +if (z->progressive) { +// dequantize and idct the data +int i,j,n; +for (n=0; n < z->s->img_n; ++n) { +int w = (z->img_comp[n].x+7) >> 3; +int h = (z->img_comp[n].y+7) >> 3; +for (j=0; j < h; ++j) { +for (i=0; i < w; ++i) { +short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); +stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); +z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); +} +} +} +} +} + +static int stbi__process_marker(stbi__jpeg *z, int m) +{ +int L; +switch (m) { +case STBI__MARKER_none: // no marker found +return stbi__err("expected marker","Corrupt JPEG"); + +case 0xDD: // DRI - specify restart interval +if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); +z->restart_interval = stbi__get16be(z->s); +return 1; + +case 0xDB: // DQT - define quantization table +L = stbi__get16be(z->s)-2; +while (L > 0) { +int q = stbi__get8(z->s); +int p = q >> 4, sixteen = (p != 0); +int t = q & 15,i; +if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG"); +if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); + +for (i=0; i < 64; ++i) +z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s)); +L -= (sixteen ? 129 : 65); +} +return L==0; + +case 0xC4: // DHT - define huffman table +L = stbi__get16be(z->s)-2; +while (L > 0) { +stbi_uc *v; +int sizes[16],i,n=0; +int q = stbi__get8(z->s); +int tc = q >> 4; +int th = q & 15; +if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); +for (i=0; i < 16; ++i) { +sizes[i] = stbi__get8(z->s); +n += sizes[i]; +} +L -= 17; +if (tc == 0) { +if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; +v = z->huff_dc[th].values; +} else { +if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; +v = z->huff_ac[th].values; +} +for (i=0; i < n; ++i) +v[i] = stbi__get8(z->s); +if (tc != 0) +stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); +L -= n; +} +return L==0; +} + +// check for comment block or APP blocks +if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { +L = stbi__get16be(z->s); +if (L < 2) { +if (m == 0xFE) +return stbi__err("bad COM len","Corrupt JPEG"); +else +return stbi__err("bad APP len","Corrupt JPEG"); +} +L -= 2; + +if (m == 0xE0 && L >= 5) { // JFIF APP0 segment +static const unsigned char tag[5] = {'J','F','I','F','\0'}; +int ok = 1; +int i; +for (i=0; i < 5; ++i) +if (stbi__get8(z->s) != tag[i]) +ok = 0; +L -= 5; +if (ok) +z->jfif = 1; +} else if (m == 0xEE && L >= 12) { // Adobe APP14 segment +static const unsigned char tag[6] = {'A','d','o','b','e','\0'}; +int ok = 1; +int i; +for (i=0; i < 6; ++i) +if (stbi__get8(z->s) != tag[i]) +ok = 0; +L -= 6; +if (ok) { +stbi__get8(z->s); // version +stbi__get16be(z->s); // flags0 +stbi__get16be(z->s); // flags1 +z->app14_color_transform = stbi__get8(z->s); // color transform +L -= 6; +} +} + +stbi__skip(z->s, L); +return 1; +} + +return stbi__err("unknown marker","Corrupt JPEG"); +} + +// after we see SOS +static int stbi__process_scan_header(stbi__jpeg *z) +{ +int i; +int Ls = stbi__get16be(z->s); +z->scan_n = stbi__get8(z->s); +if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); +if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); +for (i=0; i < z->scan_n; ++i) { +int id = stbi__get8(z->s), which; +int q = stbi__get8(z->s); +for (which = 0; which < z->s->img_n; ++which) +if (z->img_comp[which].id == id) +break; +if (which == z->s->img_n) return 0; // no match +z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); +z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); +z->order[i] = which; +} + +{ +int aa; +z->spec_start = stbi__get8(z->s); +z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 +aa = stbi__get8(z->s); +z->succ_high = (aa >> 4); +z->succ_low = (aa & 15); +if (z->progressive) { +if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) +return stbi__err("bad SOS", "Corrupt JPEG"); +} else { +if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); +if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); +z->spec_end = 63; +} +} + +return 1; +} + +static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why) +{ +int i; +for (i=0; i < ncomp; ++i) { +if (z->img_comp[i].raw_data) { +STBI_FREE(z->img_comp[i].raw_data); +z->img_comp[i].raw_data = NULL; +z->img_comp[i].data = NULL; +} +if (z->img_comp[i].raw_coeff) { +STBI_FREE(z->img_comp[i].raw_coeff); +z->img_comp[i].raw_coeff = 0; +z->img_comp[i].coeff = 0; +} +if (z->img_comp[i].linebuf) { +STBI_FREE(z->img_comp[i].linebuf); +z->img_comp[i].linebuf = NULL; +} +} +return why; +} + +static int stbi__process_frame_header(stbi__jpeg *z, int scan) +{ +stbi__context *s = z->s; +int Lf,p,i,q, h_max=1,v_max=1,c; +Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG +p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline +s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG +s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires +if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); +if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); +c = stbi__get8(s); +if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG"); +s->img_n = c; +for (i=0; i < c; ++i) { +z->img_comp[i].data = NULL; +z->img_comp[i].linebuf = NULL; +} + +if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG"); + +z->rgb = 0; +for (i=0; i < s->img_n; ++i) { +static const unsigned char rgb[3] = { 'R', 'G', 'B' }; +z->img_comp[i].id = stbi__get8(s); +if (s->img_n == 3 && z->img_comp[i].id == rgb[i]) +++z->rgb; +q = stbi__get8(s); +z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); +z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); +z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG"); +} + +if (scan != STBI__SCAN_load) return 1; + +if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode"); + +for (i=0; i < s->img_n; ++i) { +if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; +if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; +} + +// check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios +// and I've never seen a non-corrupted JPEG file actually use them +for (i=0; i < s->img_n; ++i) { +if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG"); +if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG"); +} + +// compute interleaved mcu info +z->img_h_max = h_max; +z->img_v_max = v_max; +z->img_mcu_w = h_max * 8; +z->img_mcu_h = v_max * 8; +// these sizes can't be more than 17 bits +z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; +z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; + +for (i=0; i < s->img_n; ++i) { +// number of effective pixels (e.g. for non-interleaved MCU) +z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; +z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; +// to simplify generation, we'll allocate enough memory to decode +// the bogus oversized data from using interleaved MCUs and their +// big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't +// discard the extra data until colorspace conversion +// +// img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) +// so these muls can't overflow with 32-bit ints (which we require) +z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; +z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; +z->img_comp[i].coeff = 0; +z->img_comp[i].raw_coeff = 0; +z->img_comp[i].linebuf = NULL; +z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15); +if (z->img_comp[i].raw_data == NULL) +return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); +// align blocks for idct using mmx/sse +z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); +if (z->progressive) { +// w2, h2 are multiples of 8 (see above) +z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; +z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; +z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15); +if (z->img_comp[i].raw_coeff == NULL) +return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); +z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); +} +} + +return 1; +} + +// use comparisons since in some cases we handle more than one case (e.g. SOF) +#define stbi__DNL(x) ((x) == 0xdc) +#define stbi__SOI(x) ((x) == 0xd8) +#define stbi__EOI(x) ((x) == 0xd9) +#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) +#define stbi__SOS(x) ((x) == 0xda) + +#define stbi__SOF_progressive(x) ((x) == 0xc2) + +static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) +{ +int m; +z->jfif = 0; +z->app14_color_transform = -1; // valid values are 0,1,2 +z->marker = STBI__MARKER_none; // initialize cached marker to empty +m = stbi__get_marker(z); +if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); +if (scan == STBI__SCAN_type) return 1; +m = stbi__get_marker(z); +while (!stbi__SOF(m)) { +if (!stbi__process_marker(z,m)) return 0; +m = stbi__get_marker(z); +while (m == STBI__MARKER_none) { +// some files have extra padding after their blocks, so ok, we'll scan +if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); +m = stbi__get_marker(z); +} +} +z->progressive = stbi__SOF_progressive(m); +if (!stbi__process_frame_header(z, scan)) return 0; +return 1; +} + +// 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; + +// nothing to do if no components requested; check this now to avoid +// accessing uninitialized coutput[0] later +if (decode_n <= 0) { stbi__cleanup_jpeg(z); return NULL; } + +// resample and color-convert +{ +int k; +unsigned int i,j; +stbi_uc *output; +stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL }; + +stbi__resample res_comp[4]; + +for (k=0; k < decode_n; ++k) { +stbi__resample *r = &res_comp[k]; + +// allocate line buffer big enough for upsampling off the edges +// with upsample factor of 4 +z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3); +if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + +r->hs = z->img_h_max / z->img_comp[k].h; +r->vs = z->img_v_max / z->img_comp[k].v; +r->ystep = r->vs >> 1; +r->w_lores = (z->s->img_x + r->hs-1) / r->hs; +r->ypos = 0; +r->line0 = r->line1 = z->img_comp[k].data; + +if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; +else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; +else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; +else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; +else r->resample = stbi__resample_row_generic; +} + +// can't error after this so, this is safe +output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1); +if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } + +// now go ahead and resample +for (j=0; j < z->s->img_y; ++j) { +stbi_uc *out = output + n * z->s->img_x * j; +for (k=0; k < decode_n; ++k) { +stbi__resample *r = &res_comp[k]; +int y_bot = r->ystep >= (r->vs >> 1); +coutput[k] = r->resample(z->img_comp[k].linebuf, +y_bot ? r->line1 : r->line0, +y_bot ? r->line0 : r->line1, +r->w_lores, r->hs); +if (++r->ystep >= r->vs) { +r->ystep = 0; +r->line0 = r->line1; +if (++r->ypos < z->img_comp[k].y) +r->line1 += z->img_comp[k].w2; +} +} +if (n >= 3) { +stbi_uc *y = coutput[0]; +if (z->s->img_n == 3) { +if (is_rgb) { +for (i=0; i < z->s->img_x; ++i) { +out[0] = y[i]; +out[1] = coutput[1][i]; +out[2] = coutput[2][i]; +out[3] = 255; +out += n; +} +} else { +z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); +} +} else if (z->s->img_n == 4) { +if (z->app14_color_transform == 0) { // CMYK +for (i=0; i < z->s->img_x; ++i) { +stbi_uc m = coutput[3][i]; +out[0] = stbi__blinn_8x8(coutput[0][i], m); +out[1] = stbi__blinn_8x8(coutput[1][i], m); +out[2] = stbi__blinn_8x8(coutput[2][i], m); +out[3] = 255; +out += n; +} +} else if (z->app14_color_transform == 2) { // YCCK +z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); +for (i=0; i < z->s->img_x; ++i) { +stbi_uc m = coutput[3][i]; +out[0] = stbi__blinn_8x8(255 - out[0], m); +out[1] = stbi__blinn_8x8(255 - out[1], m); +out[2] = stbi__blinn_8x8(255 - out[2], m); +out += n; +} +} else { // YCbCr + alpha? Ignore the fourth channel for now +z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); +} +} else +for (i=0; i < z->s->img_x; ++i) { +out[0] = out[1] = out[2] = y[i]; +out[3] = 255; // not used if n==3 +out += n; +} +} else { +if (is_rgb) { +if (n == 1) +for (i=0; i < z->s->img_x; ++i) +*out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); +else { +for (i=0; i < z->s->img_x; ++i, out += 2) { +out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); +out[1] = 255; +} +} +} else if (z->s->img_n == 4 && z->app14_color_transform == 0) { +for (i=0; i < z->s->img_x; ++i) { +stbi_uc m = coutput[3][i]; +stbi_uc r = stbi__blinn_8x8(coutput[0][i], m); +stbi_uc g = stbi__blinn_8x8(coutput[1][i], m); +stbi_uc b = stbi__blinn_8x8(coutput[2][i], m); +out[0] = stbi__compute_y(r, g, b); +out[1] = 255; +out += n; +} +} else if (z->s->img_n == 4 && z->app14_color_transform == 2) { +for (i=0; i < z->s->img_x; ++i) { +out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]); +out[1] = 255; +out += n; +} +} else { +stbi_uc *y = coutput[0]; +if (n == 1) +for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; +else +for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; } +} +} +} +stbi__cleanup_jpeg(z); +*out_x = z->s->img_x; +*out_y = z->s->img_y; +if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output +return output; +} +} + +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +unsigned char* result; +stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); +if (!j) return stbi__errpuc("outofmem", "Out of memory"); +STBI_NOTUSED(ri); +j->s = s; +stbi__setup_jpeg(j); +result = load_jpeg_image(j, x,y,comp,req_comp); +STBI_FREE(j); +return result; +} + +static int stbi__jpeg_test(stbi__context *s) +{ +int r; +stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); +if (!j) return stbi__err("outofmem", "Out of memory"); +j->s = s; +stbi__setup_jpeg(j); +r = stbi__decode_jpeg_header(j, STBI__SCAN_type); +stbi__rewind(s); +STBI_FREE(j); +return r; +} + +static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) +{ +if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { +stbi__rewind( j->s ); +return 0; +} +if (x) *x = j->s->img_x; +if (y) *y = j->s->img_y; +if (comp) *comp = j->s->img_n >= 3 ? 3 : 1; +return 1; +} + +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) +{ +int result; +stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); +if (!j) return stbi__err("outofmem", "Out of memory"); +j->s = s; +result = stbi__jpeg_info_raw(j, x, y, comp); +STBI_FREE(j); +return result; +} +#endif + +// public domain zlib decode v0.2 Sean Barrett 2006-11-18 +// simple implementation +// - all input must be provided in an upfront buffer +// - all output is written to a single output buffer (can malloc/realloc) +// performance +// - fast huffman + +#ifndef STBI_NO_ZLIB + +// fast-way is faster to check than jpeg huffman, but slow way is slower +#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables +#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) +#define STBI__ZNSYMS 288 // number of symbols in literal/length alphabet + +// zlib-style huffman encoding +// (jpegs packs from left, zlib from right, so can't share code) +typedef struct +{ +stbi__uint16 fast[1 << STBI__ZFAST_BITS]; +stbi__uint16 firstcode[16]; +int maxcode[17]; +stbi__uint16 firstsymbol[16]; +stbi_uc size[STBI__ZNSYMS]; +stbi__uint16 value[STBI__ZNSYMS]; +} stbi__zhuffman; + +stbi_inline static int stbi__bitreverse16(int n) +{ +n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); +n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); +n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); +n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); +return n; +} + +stbi_inline static int stbi__bit_reverse(int v, int bits) +{ +STBI_ASSERT(bits <= 16); +// to bit reverse n bits, reverse 16 and shift +// e.g. 11 bits, bit reverse and shift away 5 +return stbi__bitreverse16(v) >> (16-bits); +} + +static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num) +{ +int i,k=0; +int code, next_code[16], sizes[17]; + +// DEFLATE spec for generating codes +memset(sizes, 0, sizeof(sizes)); +memset(z->fast, 0, sizeof(z->fast)); +for (i=0; i < num; ++i) +++sizes[sizelist[i]]; +sizes[0] = 0; +for (i=1; i < 16; ++i) +if (sizes[i] > (1 << i)) +return stbi__err("bad sizes", "Corrupt PNG"); +code = 0; +for (i=1; i < 16; ++i) { +next_code[i] = code; +z->firstcode[i] = (stbi__uint16) code; +z->firstsymbol[i] = (stbi__uint16) k; +code = (code + sizes[i]); +if (sizes[i]) +if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG"); +z->maxcode[i] = code << (16-i); // preshift for inner loop +code <<= 1; +k += sizes[i]; +} +z->maxcode[16] = 0x10000; // sentinel +for (i=0; i < num; ++i) { +int s = sizelist[i]; +if (s) { +int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; +stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i); +z->size [c] = (stbi_uc ) s; +z->value[c] = (stbi__uint16) i; +if (s <= STBI__ZFAST_BITS) { +int j = stbi__bit_reverse(next_code[s],s); +while (j < (1 << STBI__ZFAST_BITS)) { +z->fast[j] = fastv; +j += (1 << s); +} +} +++next_code[s]; +} +} +return 1; +} + +// zlib-from-memory implementation for PNG reading +// because PNG allows splitting the zlib stream arbitrarily, +// and it's annoying structurally to have PNG call ZLIB call PNG, +// we require PNG read all the IDATs and combine them into a single +// memory buffer + +typedef struct +{ +stbi_uc *zbuffer, *zbuffer_end; +int num_bits; +stbi__uint32 code_buffer; + +char *zout; +char *zout_start; +char *zout_end; +int z_expandable; + +stbi__zhuffman z_length, z_distance; +} stbi__zbuf; + +stbi_inline static int stbi__zeof(stbi__zbuf *z) +{ +return (z->zbuffer >= z->zbuffer_end); +} + +stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z) +{ +return stbi__zeof(z) ? 0 : *z->zbuffer++; +} + +static void stbi__fill_bits(stbi__zbuf *z) +{ +do { +if (z->code_buffer >= (1U << z->num_bits)) { +z->zbuffer = z->zbuffer_end; /* treat this as EOF so we fail. */ +return; +} +z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits; +z->num_bits += 8; +} while (z->num_bits <= 24); +} + +stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n) +{ +unsigned int k; +if (z->num_bits < n) stbi__fill_bits(z); +k = z->code_buffer & ((1 << n) - 1); +z->code_buffer >>= n; +z->num_bits -= n; +return k; +} + +static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z) +{ +int b,s,k; +// not resolved by fast table, so compute it the slow way +// use jpeg approach, which requires MSbits at top +k = stbi__bit_reverse(a->code_buffer, 16); +for (s=STBI__ZFAST_BITS+1; ; ++s) +if (k < z->maxcode[s]) +break; +if (s >= 16) return -1; // invalid code! +// code size is s, so: +b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; +if (b >= STBI__ZNSYMS) return -1; // some data was corrupt somewhere! +if (z->size[b] != s) return -1; // was originally an assert, but report failure instead. +a->code_buffer >>= s; +a->num_bits -= s; +return z->value[b]; +} + +stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z) +{ +int b,s; +if (a->num_bits < 16) { +if (stbi__zeof(a)) { +return -1; /* report error for unexpected end of data. */ +} +stbi__fill_bits(a); +} +b = z->fast[a->code_buffer & STBI__ZFAST_MASK]; +if (b) { +s = b >> 9; +a->code_buffer >>= s; +a->num_bits -= s; +return b & 511; +} +return stbi__zhuffman_decode_slowpath(a, z); +} + +static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes +{ +char *q; +unsigned int cur, limit, old_limit; +z->zout = zout; +if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); +cur = (unsigned int) (z->zout - z->zout_start); +limit = old_limit = (unsigned) (z->zout_end - z->zout_start); +if (UINT_MAX - cur < (unsigned) n) return stbi__err("outofmem", "Out of memory"); +while (cur + n > limit) { +if(limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory"); +limit *= 2; +} +q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); +STBI_NOTUSED(old_limit); +if (q == NULL) return stbi__err("outofmem", "Out of memory"); +z->zout_start = q; +z->zout = q + cur; +z->zout_end = q + limit; +return 1; +} + +static const int stbi__zlength_base[31] = { +3,4,5,6,7,8,9,10,11,13, +15,17,19,23,27,31,35,43,51,59, +67,83,99,115,131,163,195,227,258,0,0 }; + +static const int stbi__zlength_extra[31]= +{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; + +static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, +257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; + +static const int stbi__zdist_extra[32] = +{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; + +static int stbi__parse_huffman_block(stbi__zbuf *a) +{ +char *zout = a->zout; +for(;;) { +int z = stbi__zhuffman_decode(a, &a->z_length); +if (z < 256) { +if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes +if (zout >= a->zout_end) { +if (!stbi__zexpand(a, zout, 1)) return 0; +zout = a->zout; +} +*zout++ = (char) z; +} else { +stbi_uc *p; +int len,dist; +if (z == 256) { +a->zout = zout; +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 if (c == 18) { +c = stbi__zreceive(a,7)+11; +} else { +return stbi__err("bad codelengths", "Corrupt PNG"); +} +if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG"); +memset(lencodes+n, fill, c); +n += c; +} +} +if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG"); +if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; +if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; +return 1; +} + +static int stbi__parse_uncompressed_block(stbi__zbuf *a) +{ +stbi_uc header[4]; +int len,nlen,k; +if (a->num_bits & 7) +stbi__zreceive(a, a->num_bits & 7); // discard +// drain the bit-packed data into header +k = 0; +while (a->num_bits > 0) { +header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check +a->code_buffer >>= 8; +a->num_bits -= 8; +} +if (a->num_bits < 0) return stbi__err("zlib corrupt","Corrupt PNG"); +// now fill header the normal way +while (k < 4) +header[k++] = stbi__zget8(a); +len = header[1] * 256 + header[0]; +nlen = header[3] * 256 + header[2]; +if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG"); +if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG"); +if (a->zout + len > a->zout_end) +if (!stbi__zexpand(a, a->zout, len)) return 0; +memcpy(a->zout, a->zbuffer, len); +a->zbuffer += len; +a->zout += len; +return 1; +} + +static int stbi__parse_zlib_header(stbi__zbuf *a) +{ +int cmf = stbi__zget8(a); +int cm = cmf & 15; +/* int cinfo = cmf >> 4; */ +int flg = stbi__zget8(a); +if (stbi__zeof(a)) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec +if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec +if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png +if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png +// window = 1 << (8 + cinfo)... but who cares, we fully buffer output +return 1; +} + +static const stbi_uc stbi__zdefault_length[STBI__ZNSYMS] = +{ +8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, +8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, +8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, +8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, +8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, +9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, +9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, +9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, +7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8 +}; +static const stbi_uc stbi__zdefault_distance[32] = +{ +5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 +}; +/* +Init algorithm: +{ +int i; // use <= to match clearly with spec +for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; +for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; +for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; +for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; + +for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; +} +*/ + +static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) +{ +int final, type; +if (parse_header) +if (!stbi__parse_zlib_header(a)) return 0; +a->num_bits = 0; +a->code_buffer = 0; +do { +final = stbi__zreceive(a,1); +type = stbi__zreceive(a,2); +if (type == 0) { +if (!stbi__parse_uncompressed_block(a)) return 0; +} else if (type == 3) { +return 0; +} else { +if (type == 1) { +// use fixed code lengths +if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , STBI__ZNSYMS)) return 0; +if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; +} else { +if (!stbi__compute_huffman_codes(a)) return 0; +} +if (!stbi__parse_huffman_block(a)) return 0; +} +} while (!final); +return 1; +} + +static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) +{ +a->zout_start = obuf; +a->zout = obuf; +a->zout_end = obuf + olen; +a->z_expandable = exp; + +return stbi__parse_zlib(a, parse_header); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) +{ +stbi__zbuf a; +char *p = (char *) stbi__malloc(initial_size); +if (p == NULL) return NULL; +a.zbuffer = (stbi_uc *) buffer; +a.zbuffer_end = (stbi_uc *) buffer + len; +if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { +if (outlen) *outlen = (int) (a.zout - a.zout_start); +return a.zout_start; +} else { +STBI_FREE(a.zout_start); +return NULL; +} +} + +STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) +{ +return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); +} + +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) +{ +stbi__zbuf a; +char *p = (char *) stbi__malloc(initial_size); +if (p == NULL) return NULL; +a.zbuffer = (stbi_uc *) buffer; +a.zbuffer_end = (stbi_uc *) buffer + len; +if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { +if (outlen) *outlen = (int) (a.zout - a.zout_start); +return a.zout_start; +} else { +STBI_FREE(a.zout_start); +return NULL; +} +} + +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) +{ +stbi__zbuf a; +a.zbuffer = (stbi_uc *) ibuffer; +a.zbuffer_end = (stbi_uc *) ibuffer + ilen; +if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) +return (int) (a.zout - a.zout_start); +else +return -1; +} + +STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) +{ +stbi__zbuf a; +char *p = (char *) stbi__malloc(16384); +if (p == NULL) return NULL; +a.zbuffer = (stbi_uc *) buffer; +a.zbuffer_end = (stbi_uc *) buffer+len; +if (stbi__do_zlib(&a, p, 16384, 1, 0)) { +if (outlen) *outlen = (int) (a.zout - a.zout_start); +return a.zout_start; +} else { +STBI_FREE(a.zout_start); +return NULL; +} +} + +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) +{ +stbi__zbuf a; +a.zbuffer = (stbi_uc *) ibuffer; +a.zbuffer_end = (stbi_uc *) ibuffer + ilen; +if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) +return (int) (a.zout - a.zout_start); +else +return -1; +} +#endif + +// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 +// simple implementation +// - only 8-bit samples +// - no CRC checking +// - allocates lots of intermediate memory +// - avoids problem of streaming data between subsystems +// - avoids explicit window management +// performance +// - uses stb_zlib, a PD zlib implementation with fast huffman decoding + +#ifndef STBI_NO_PNG +typedef struct +{ +stbi__uint32 length; +stbi__uint32 type; +} stbi__pngchunk; + +static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) +{ +stbi__pngchunk c; +c.length = stbi__get32be(s); +c.type = stbi__get32be(s); +return c; +} + +static int stbi__check_png_header(stbi__context *s) +{ +static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; +int i; +for (i=0; i < 8; ++i) +if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); +return 1; +} + +typedef struct +{ +stbi__context *s; +stbi_uc *idata, *expanded, *out; +int depth; +} stbi__png; + + +enum { +STBI__F_none=0, +STBI__F_sub=1, +STBI__F_up=2, +STBI__F_avg=3, +STBI__F_paeth=4, +// synthetic 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) { +if (img_width_bytes > x) return stbi__err("invalid width","Corrupt PNG"); +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); +if (!final) return stbi__err("outofmem", "Out of memory"); +for (p=0; p < 7; ++p) { +int xorig[] = { 0,4,0,2,0,1,0 }; +int yorig[] = { 0,0,4,0,2,0,1 }; +int xspc[] = { 8,8,4,4,2,2,1 }; +int yspc[] = { 8,8,8,4,4,2,2 }; +int i,j,x,y; +// pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 +x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; +y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; +if (x && y) { +stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; +if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { +STBI_FREE(final); +return 0; +} +for (j=0; j < y; ++j) { +for (i=0; i < x; ++i) { +int out_y = j*yspc[p]+yorig[p]; +int out_x = i*xspc[p]+xorig[p]; +memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes, +a->out + (j*x+i)*out_bytes, out_bytes); +} +} +STBI_FREE(a->out); +image_data += img_len; +image_data_len -= img_len; +} +} +a->out = final; + +return 1; +} + +static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) +{ +stbi__context *s = z->s; +stbi__uint32 i, pixel_count = s->img_x * s->img_y; +stbi_uc *p = z->out; + +// compute color-based transparency, assuming we've +// already got 255 as the alpha value in the output +STBI_ASSERT(out_n == 2 || out_n == 4); + +if (out_n == 2) { +for (i=0; i < pixel_count; ++i) { +p[1] = (p[0] == tc[0] ? 0 : 255); +p += 2; +} +} else { +for (i=0; i < pixel_count; ++i) { +if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) +p[3] = 0; +p += 4; +} +} +return 1; +} + +static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n) +{ +stbi__context *s = z->s; +stbi__uint32 i, pixel_count = s->img_x * s->img_y; +stbi__uint16 *p = (stbi__uint16*) z->out; + +// compute color-based transparency, assuming we've +// already got 65535 as the alpha value in the output +STBI_ASSERT(out_n == 2 || out_n == 4); + +if (out_n == 2) { +for (i = 0; i < pixel_count; ++i) { +p[1] = (p[0] == tc[0] ? 0 : 65535); +p += 2; +} +} else { +for (i = 0; i < pixel_count; ++i) { +if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) +p[3] = 0; +p += 4; +} +} +return 1; +} + +static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) +{ +stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; +stbi_uc *p, *temp_out, *orig = a->out; + +p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0); +if (p == NULL) return stbi__err("outofmem", "Out of memory"); + +// between here and free(out) below, exitting would leak +temp_out = p; + +if (pal_img_n == 3) { +for (i=0; i < pixel_count; ++i) { +int n = orig[i]*4; +p[0] = palette[n ]; +p[1] = palette[n+1]; +p[2] = palette[n+2]; +p += 3; +} +} else { +for (i=0; i < pixel_count; ++i) { +int n = orig[i]*4; +p[0] = palette[n ]; +p[1] = palette[n+1]; +p[2] = palette[n+2]; +p[3] = palette[n+3]; +p += 4; +} +} +STBI_FREE(a->out); +a->out = temp_out; + +STBI_NOTUSED(len); + +return 1; +} + +static int stbi__unpremultiply_on_load_global = 0; +static int stbi__de_iphone_flag_global = 0; + +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) +{ +stbi__unpremultiply_on_load_global = flag_true_if_should_unpremultiply; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) +{ +stbi__de_iphone_flag_global = flag_true_if_should_convert; +} + +#ifndef STBI_THREAD_LOCAL +#define stbi__unpremultiply_on_load stbi__unpremultiply_on_load_global +#define stbi__de_iphone_flag stbi__de_iphone_flag_global +#else +static STBI_THREAD_LOCAL int stbi__unpremultiply_on_load_local, stbi__unpremultiply_on_load_set; +static STBI_THREAD_LOCAL int stbi__de_iphone_flag_local, stbi__de_iphone_flag_set; + +STBIDEF void stbi__unpremultiply_on_load_thread(int flag_true_if_should_unpremultiply) +{ +stbi__unpremultiply_on_load_local = flag_true_if_should_unpremultiply; +stbi__unpremultiply_on_load_set = 1; +} + +STBIDEF void stbi_convert_iphone_png_to_rgb_thread(int flag_true_if_should_convert) +{ +stbi__de_iphone_flag_local = flag_true_if_should_convert; +stbi__de_iphone_flag_set = 1; +} + +#define stbi__unpremultiply_on_load (stbi__unpremultiply_on_load_set \ +? stbi__unpremultiply_on_load_local \ +: stbi__unpremultiply_on_load_global) +#define stbi__de_iphone_flag (stbi__de_iphone_flag_set \ +? stbi__de_iphone_flag_local \ +: stbi__de_iphone_flag_global) +#endif // STBI_THREAD_LOCAL + +static void stbi__de_iphone(stbi__png *z) +{ +stbi__context *s = z->s; +stbi__uint32 i, pixel_count = s->img_x * s->img_y; +stbi_uc *p = z->out; + +if (s->img_out_n == 3) { // convert bgr to rgb +for (i=0; i < pixel_count; ++i) { +stbi_uc t = p[0]; +p[0] = p[2]; +p[2] = t; +p += 3; +} +} else { +STBI_ASSERT(s->img_out_n == 4); +if (stbi__unpremultiply_on_load) { +// convert bgr to rgb and unpremultiply +for (i=0; i < pixel_count; ++i) { +stbi_uc a = p[3]; +stbi_uc t = p[0]; +if (a) { +stbi_uc half = a / 2; +p[0] = (p[2] * 255 + half) / a; +p[1] = (p[1] * 255 + half) / a; +p[2] = ( t * 255 + half) / a; +} else { +p[0] = p[2]; +p[2] = t; +} +p += 4; +} +} else { +// convert bgr to rgb +for (i=0; i < pixel_count; ++i) { +stbi_uc t = p[0]; +p[0] = p[2]; +p[2] = t; +p += 4; +} +} +} +} + +#define STBI__PNG_TYPE(a,b,c,d) (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d)) + +static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) +{ +stbi_uc palette[1024], pal_img_n=0; +stbi_uc has_trans=0, tc[3]={0}; +stbi__uint16 tc16[3]; +stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; +int first=1,k,interlace=0, color=0, is_iphone=0; +stbi__context *s = z->s; + +z->expanded = NULL; +z->idata = NULL; +z->out = NULL; + +if (!stbi__check_png_header(s)) return 0; + +if (scan == STBI__SCAN_type) return 1; + +for (;;) { +stbi__pngchunk c = stbi__get_chunk_header(s); +switch (c.type) { +case STBI__PNG_TYPE('C','g','B','I'): +is_iphone = 1; +stbi__skip(s, c.length); +break; +case STBI__PNG_TYPE('I','H','D','R'): { +int comp,filter; +if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); +first = 0; +if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); +s->img_x = stbi__get32be(s); +s->img_y = stbi__get32be(s); +if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); +if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); +z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only"); +color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); +if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG"); +if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); +comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); +filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); +interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG"); +if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG"); +if (!pal_img_n) { +s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); +if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode"); +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; +// end of PNG chunk, read and skip CRC +stbi__get32be(s); +return 1; +} + +default: +// if critical, fail +if (first) return stbi__err("first not IHDR", "Corrupt PNG"); +if ((c.type & (1 << 29)) == 0) { +#ifndef STBI_NO_FAILURE_STRINGS +// not threadsafe +static char invalid_chunk[] = "XXXX PNG chunk not known"; +invalid_chunk[0] = STBI__BYTECAST(c.type >> 24); +invalid_chunk[1] = STBI__BYTECAST(c.type >> 16); +invalid_chunk[2] = STBI__BYTECAST(c.type >> 8); +invalid_chunk[3] = STBI__BYTECAST(c.type >> 0); +#endif +return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type"); +} +stbi__skip(s, c.length); +break; +} +// end of PNG chunk, read and skip CRC +stbi__get32be(s); +} +} + +static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri) +{ +void *result=NULL; +if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); +if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { +if (p->depth <= 8) +ri->bits_per_channel = 8; +else if (p->depth == 16) +ri->bits_per_channel = 16; +else +return stbi__errpuc("bad bits_per_channel", "PNG not supported: unsupported color depth"); +result = p->out; +p->out = NULL; +if (req_comp && req_comp != p->s->img_out_n) { +if (ri->bits_per_channel == 8) +result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); +else +result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y); +p->s->img_out_n = req_comp; +if (result == NULL) return result; +} +*x = p->s->img_x; +*y = p->s->img_y; +if (n) *n = p->s->img_n; +} +STBI_FREE(p->out); p->out = NULL; +STBI_FREE(p->expanded); p->expanded = NULL; +STBI_FREE(p->idata); p->idata = NULL; + +return result; +} + +static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +stbi__png p; +p.s = s; +return stbi__do_png(&p, x,y,comp,req_comp, ri); +} + +static int stbi__png_test(stbi__context *s) +{ +int r; +r = stbi__check_png_header(s); +stbi__rewind(s); +return r; +} + +static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp) +{ +if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) { +stbi__rewind( p->s ); +return 0; +} +if (x) *x = p->s->img_x; +if (y) *y = p->s->img_y; +if (comp) *comp = p->s->img_n; +return 1; +} + +static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp) +{ +stbi__png p; +p.s = s; +return stbi__png_info_raw(&p, x, y, comp); +} + +static int stbi__png_is16(stbi__context *s) +{ +stbi__png p; +p.s = s; +if (!stbi__png_info_raw(&p, NULL, NULL, NULL)) +return 0; +if (p.depth != 16) { +stbi__rewind(p.s); +return 0; +} +return 1; +} +#endif + +// Microsoft/Windows BMP image + +#ifndef STBI_NO_BMP +static int stbi__bmp_test_raw(stbi__context *s) +{ +int r; +int sz; +if (stbi__get8(s) != 'B') return 0; +if (stbi__get8(s) != 'M') return 0; +stbi__get32le(s); // discard filesize +stbi__get16le(s); // discard reserved +stbi__get16le(s); // discard reserved +stbi__get32le(s); // discard data offset +sz = stbi__get32le(s); +r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124); +return r; +} + +static int stbi__bmp_test(stbi__context *s) +{ +int r = stbi__bmp_test_raw(s); +stbi__rewind(s); +return r; +} + + +// returns 0..31 for the highest set bit +static int stbi__high_bit(unsigned int z) +{ +int n=0; +if (z == 0) return -1; +if (z >= 0x10000) { n += 16; z >>= 16; } +if (z >= 0x00100) { n += 8; z >>= 8; } +if (z >= 0x00010) { n += 4; z >>= 4; } +if (z >= 0x00004) { n += 2; z >>= 2; } +if (z >= 0x00002) { n += 1;/* >>= 1;*/ } +return n; +} + +static int stbi__bitcount(unsigned int a) +{ +a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 +a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 +a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits +a = (a + (a >> 8)); // max 16 per 8 bits +a = (a + (a >> 16)); // max 32 per 8 bits +return a & 0xff; +} + +// extract an arbitrarily-aligned N-bit value (N=bits) +// from v, and then make it 8-bits long and fractionally +// extend it to full full range. +static int stbi__shiftsigned(unsigned int v, int shift, int bits) +{ +static unsigned int mul_table[9] = { +0, +0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/, +0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/, +}; +static unsigned int shift_table[9] = { +0, 0,0,1,0,2,4,6,0, +}; +if (shift < 0) +v <<= -shift; +else +v >>= shift; +STBI_ASSERT(v < 256); +v >>= (8-bits); +STBI_ASSERT(bits >= 0 && bits <= 8); +return (int) ((unsigned) v * mul_table[bits]) >> shift_table[bits]; +} + +typedef struct +{ +int bpp, offset, hsz; +unsigned int mr,mg,mb,ma, all_a; +int extra_read; +} stbi__bmp_data; + +static int stbi__bmp_set_mask_defaults(stbi__bmp_data *info, int compress) +{ +// BI_BITFIELDS specifies masks explicitly, don't override +if (compress == 3) +return 1; + +if (compress == 0) { +if (info->bpp == 16) { +info->mr = 31u << 10; +info->mg = 31u << 5; +info->mb = 31u << 0; +} else if (info->bpp == 32) { +info->mr = 0xffu << 16; +info->mg = 0xffu << 8; +info->mb = 0xffu << 0; +info->ma = 0xffu << 24; +info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 +} else { +// otherwise, use defaults, which is all-0 +info->mr = info->mg = info->mb = info->ma = 0; +} +return 1; +} +return 0; // error +} + +static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) +{ +int hsz; +if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP"); +stbi__get32le(s); // discard filesize +stbi__get16le(s); // discard reserved +stbi__get16le(s); // discard reserved +info->offset = stbi__get32le(s); +info->hsz = hsz = stbi__get32le(s); +info->mr = info->mg = info->mb = info->ma = 0; +info->extra_read = 14; + +if (info->offset < 0) return stbi__errpuc("bad BMP", "bad BMP"); + +if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); +if (hsz == 12) { +s->img_x = stbi__get16le(s); +s->img_y = stbi__get16le(s); +} else { +s->img_x = stbi__get32le(s); +s->img_y = stbi__get32le(s); +} +if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP"); +info->bpp = stbi__get16le(s); +if (hsz != 12) { +int compress = stbi__get32le(s); +if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE"); +if (compress >= 4) return stbi__errpuc("BMP JPEG/PNG", "BMP type not supported: unsupported compression"); // this includes PNG/JPEG modes +if (compress == 3 && info->bpp != 16 && info->bpp != 32) return stbi__errpuc("bad BMP", "bad BMP"); // bitfields requires 16 or 32 bits/pixel +stbi__get32le(s); // discard sizeof +stbi__get32le(s); // discard hres +stbi__get32le(s); // discard vres +stbi__get32le(s); // discard colorsused +stbi__get32le(s); // discard max important +if (hsz == 40 || hsz == 56) { +if (hsz == 56) { +stbi__get32le(s); +stbi__get32le(s); +stbi__get32le(s); +stbi__get32le(s); +} +if (info->bpp == 16 || info->bpp == 32) { +if (compress == 0) { +stbi__bmp_set_mask_defaults(info, compress); +} else if (compress == 3) { +info->mr = stbi__get32le(s); +info->mg = stbi__get32le(s); +info->mb = stbi__get32le(s); +info->extra_read += 12; +// not documented, but generated by photoshop and handled by mspaint +if (info->mr == info->mg && info->mg == info->mb) { +// ?!?!? +return stbi__errpuc("bad BMP", "bad BMP"); +} +} else +return stbi__errpuc("bad BMP", "bad BMP"); +} +} else { +// V4/V5 header +int i; +if (hsz != 108 && hsz != 124) +return stbi__errpuc("bad BMP", "bad BMP"); +info->mr = stbi__get32le(s); +info->mg = stbi__get32le(s); +info->mb = stbi__get32le(s); +info->ma = stbi__get32le(s); +if (compress != 3) // override mr/mg/mb unless in BI_BITFIELDS mode, as per docs +stbi__bmp_set_mask_defaults(info, compress); +stbi__get32le(s); // discard color space +for (i=0; i < 12; ++i) +stbi__get32le(s); // discard color space parameters +if (hsz == 124) { +stbi__get32le(s); // discard rendering intent +stbi__get32le(s); // discard offset of profile data +stbi__get32le(s); // discard size of profile data +stbi__get32le(s); // discard reserved +} +} +} +return (void *) 1; +} + + +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +stbi_uc *out; +unsigned int mr=0,mg=0,mb=0,ma=0, all_a; +stbi_uc pal[256][4]; +int psize=0,i,j,width; +int flip_vertically, pad, target; +stbi__bmp_data info; +STBI_NOTUSED(ri); + +info.all_a = 255; +if (stbi__bmp_parse_header(s, &info) == NULL) +return NULL; // error code already set + +flip_vertically = ((int) s->img_y) > 0; +s->img_y = abs((int) s->img_y); + +if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); +if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + +mr = info.mr; +mg = info.mg; +mb = info.mb; +ma = info.ma; +all_a = info.all_a; + +if (info.hsz == 12) { +if (info.bpp < 24) +psize = (info.offset - info.extra_read - 24) / 3; +} else { +if (info.bpp < 16) +psize = (info.offset - info.extra_read - info.hsz) >> 2; +} +if (psize == 0) { +if (info.offset != s->callback_already_read + (s->img_buffer - s->img_buffer_original)) { +return stbi__errpuc("bad offset", "Corrupt BMP"); +} +} + +if (info.bpp == 24 && ma == 0xff000000) +s->img_n = 3; +else +s->img_n = ma ? 4 : 3; +if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 +target = req_comp; +else +target = s->img_n; // if they want monochrome, we'll post-convert + +// sanity-check size +if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0)) +return stbi__errpuc("too large", "Corrupt BMP"); + +out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0); +if (!out) return stbi__errpuc("outofmem", "Out of memory"); +if (info.bpp < 16) { +int z=0; +if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); } +for (i=0; i < psize; ++i) { +pal[i][2] = stbi__get8(s); +pal[i][1] = stbi__get8(s); +pal[i][0] = stbi__get8(s); +if (info.hsz != 12) stbi__get8(s); +pal[i][3] = 255; +} +stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4)); +if (info.bpp == 1) width = (s->img_x + 7) >> 3; +else if (info.bpp == 4) width = (s->img_x + 1) >> 1; +else if (info.bpp == 8) width = s->img_x; +else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); } +pad = (-width)&3; +if (info.bpp == 1) { +for (j=0; j < (int) s->img_y; ++j) { +int bit_offset = 7, v = stbi__get8(s); +for (i=0; i < (int) s->img_x; ++i) { +int color = (v>>bit_offset)&0x1; +out[z++] = pal[color][0]; +out[z++] = pal[color][1]; +out[z++] = pal[color][2]; +if (target == 4) out[z++] = 255; +if (i+1 == (int) s->img_x) break; +if((--bit_offset) < 0) { +bit_offset = 7; +v = stbi__get8(s); +} +} +stbi__skip(s, pad); +} +} else { +for (j=0; j < (int) s->img_y; ++j) { +for (i=0; i < (int) s->img_x; i += 2) { +int v=stbi__get8(s),v2=0; +if (info.bpp == 4) { +v2 = v & 15; +v >>= 4; +} +out[z++] = pal[v][0]; +out[z++] = pal[v][1]; +out[z++] = pal[v][2]; +if (target == 4) out[z++] = 255; +if (i+1 == (int) s->img_x) break; +v = (info.bpp == 8) ? stbi__get8(s) : v2; +out[z++] = pal[v][0]; +out[z++] = pal[v][1]; +out[z++] = pal[v][2]; +if (target == 4) out[z++] = 255; +} +stbi__skip(s, pad); +} +} +} else { +int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; +int z = 0; +int easy=0; +stbi__skip(s, info.offset - info.extra_read - info.hsz); +if (info.bpp == 24) width = 3 * s->img_x; +else if (info.bpp == 16) width = 2*s->img_x; +else /* bpp = 32 and pad = 0 */ width=0; +pad = (-width) & 3; +if (info.bpp == 24) { +easy = 1; +} else if (info.bpp == 32) { +if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000) +easy = 2; +} +if (!easy) { +if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } +// right shift amt to put high bit in position #7 +rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr); +gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg); +bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb); +ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma); +if (rcount > 8 || gcount > 8 || bcount > 8 || acount > 8) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); } +} +for (j=0; j < (int) s->img_y; ++j) { +if (easy) { +for (i=0; i < (int) s->img_x; ++i) { +unsigned char a; +out[z+2] = stbi__get8(s); +out[z+1] = stbi__get8(s); +out[z+0] = stbi__get8(s); +z += 3; +a = (easy == 2 ? stbi__get8(s) : 255); +all_a |= a; +if (target == 4) out[z++] = a; +} +} else { +int bpp = info.bpp; +for (i=0; i < (int) s->img_x; ++i) { +stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s)); +unsigned int a; +out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount)); +out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount)); +out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount)); +a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255); +all_a |= a; +if (target == 4) out[z++] = STBI__BYTECAST(a); +} +} +stbi__skip(s, pad); +} +} + +// if alpha channel is all 0s, replace with all 255s +if (target == 4 && all_a == 0) +for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) +out[i] = 255; + +if (flip_vertically) { +stbi_uc t; +for (j=0; j < (int) s->img_y>>1; ++j) { +stbi_uc *p1 = out + j *s->img_x*target; +stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; +for (i=0; i < (int) s->img_x*target; ++i) { +t = p1[i]; p1[i] = p2[i]; p2[i] = t; +} +} +} + +if (req_comp && req_comp != target) { +out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y); +if (out == NULL) return out; // stbi__convert_format frees input on failure +} + +*x = s->img_x; +*y = s->img_y; +if (comp) *comp = s->img_n; +return out; +} +#endif + +// Targa Truevision - TGA +// by Jonathan Dummer +#ifndef STBI_NO_TGA +// returns STBI_rgb or whatever, 0 on error +static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16) +{ +// only RGB or RGBA (incl. 16bit) or grey allowed +if (is_rgb16) *is_rgb16 = 0; +switch(bits_per_pixel) { +case 8: return STBI_grey; +case 16: if(is_grey) return STBI_grey_alpha; +// fallthrough +case 15: if(is_rgb16) *is_rgb16 = 1; +return STBI_rgb; +case 24: // fallthrough +case 32: return bits_per_pixel/8; +default: return 0; +} +} + +static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp) +{ +int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp; +int sz, tga_colormap_type; +stbi__get8(s); // discard Offset +tga_colormap_type = stbi__get8(s); // colormap type +if( tga_colormap_type > 1 ) { +stbi__rewind(s); +return 0; // only RGB or indexed allowed +} +tga_image_type = stbi__get8(s); // image type +if ( tga_colormap_type == 1 ) { // colormapped (paletted) image +if (tga_image_type != 1 && tga_image_type != 9) { +stbi__rewind(s); +return 0; +} +stbi__skip(s,4); // skip index of first colormap entry and number of entries +sz = stbi__get8(s); // check bits per palette color entry +if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) { +stbi__rewind(s); +return 0; +} +stbi__skip(s,4); // skip image x and y origin +tga_colormap_bpp = sz; +} else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE +if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) { +stbi__rewind(s); +return 0; // only RGB or grey allowed, +/- RLE +} +stbi__skip(s,9); // skip colormap specification and image x/y origin +tga_colormap_bpp = 0; +} +tga_w = stbi__get16le(s); +if( tga_w < 1 ) { +stbi__rewind(s); +return 0; // test width +} +tga_h = stbi__get16le(s); +if( tga_h < 1 ) { +stbi__rewind(s); +return 0; // test height +} +tga_bits_per_pixel = stbi__get8(s); // bits per pixel +stbi__get8(s); // ignore alpha bits +if (tga_colormap_bpp != 0) { +if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) { +// when using a colormap, tga_bits_per_pixel is the size of the indexes +// I don't think anything but 8 or 16bit indexes makes sense +stbi__rewind(s); +return 0; +} +tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL); +} else { +tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL); +} +if(!tga_comp) { +stbi__rewind(s); +return 0; +} +if (x) *x = tga_w; +if (y) *y = tga_h; +if (comp) *comp = tga_comp; +return 1; // seems to have passed everything +} + +static int stbi__tga_test(stbi__context *s) +{ +int res = 0; +int sz, tga_color_type; +stbi__get8(s); // discard Offset +tga_color_type = stbi__get8(s); // color type +if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed +sz = stbi__get8(s); // image type +if ( tga_color_type == 1 ) { // colormapped (paletted) image +if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9 +stbi__skip(s,4); // skip index of first colormap entry and number of entries +sz = stbi__get8(s); // check bits per palette color entry +if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; +stbi__skip(s,4); // skip image x and y origin +} else { // "normal" image w/o colormap +if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE +stbi__skip(s,9); // skip colormap specification and image x/y origin +} +if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width +if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height +sz = stbi__get8(s); // bits per pixel +if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index +if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd; + +res = 1; // if we got this far, everything's good and we can return 1 instead of 0 + +errorEnd: +stbi__rewind(s); +return res; +} + +// read 16bit value and convert to 24bit RGB +static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out) +{ +stbi__uint16 px = (stbi__uint16)stbi__get16le(s); +stbi__uint16 fiveBitMask = 31; +// we have 3 channels with 5bits each +int r = (px >> 10) & fiveBitMask; +int g = (px >> 5) & fiveBitMask; +int b = px & fiveBitMask; +// Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later +out[0] = (stbi_uc)((r * 255)/31); +out[1] = (stbi_uc)((g * 255)/31); +out[2] = (stbi_uc)((b * 255)/31); + +// some people claim that the most significant bit might be used for alpha +// (possibly if an alpha-bit is set in the "image descriptor byte") +// but that only made 16bit test images completely translucent.. +// so let's treat all 15 and 16bit TGAs as RGB with no alpha. +} + +static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +// read in the TGA header stuff +int tga_offset = stbi__get8(s); +int tga_indexed = stbi__get8(s); +int tga_image_type = stbi__get8(s); +int tga_is_RLE = 0; +int tga_palette_start = stbi__get16le(s); +int tga_palette_len = stbi__get16le(s); +int tga_palette_bits = stbi__get8(s); +int tga_x_origin = stbi__get16le(s); +int tga_y_origin = stbi__get16le(s); +int tga_width = stbi__get16le(s); +int tga_height = stbi__get16le(s); +int tga_bits_per_pixel = stbi__get8(s); +int tga_comp, tga_rgb16=0; +int tga_inverted = stbi__get8(s); +// int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?) +// image data +unsigned char *tga_data; +unsigned char *tga_palette = NULL; +int i, j; +unsigned char raw_data[4] = {0}; +int RLE_count = 0; +int RLE_repeating = 0; +int read_next_pixel = 1; +STBI_NOTUSED(ri); +STBI_NOTUSED(tga_x_origin); // @TODO +STBI_NOTUSED(tga_y_origin); // @TODO + +if (tga_height > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); +if (tga_width > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + +// do a tiny bit of precessing +if ( tga_image_type >= 8 ) +{ +tga_image_type -= 8; +tga_is_RLE = 1; +} +tga_inverted = 1 - ((tga_inverted >> 5) & 1); + +// If I'm paletted, then I'll use the number of bits from the palette +if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16); +else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16); + +if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency +return stbi__errpuc("bad format", "Can't find out TGA pixelformat"); + +// tga info +*x = tga_width; +*y = tga_height; +if (comp) *comp = tga_comp; + +if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0)) +return stbi__errpuc("too large", "Corrupt TGA"); + +tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0); +if (!tga_data) return stbi__errpuc("outofmem", "Out of memory"); + +// skip to the data's starting position (offset usually = 0) +stbi__skip(s, tga_offset ); + +if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) { +for (i=0; i < tga_height; ++i) { +int row = tga_inverted ? tga_height -i - 1 : i; +stbi_uc *tga_row = tga_data + row*tga_width*tga_comp; +stbi__getn(s, tga_row, tga_width * tga_comp); +} +} else { +// do I need to load a palette? +if ( tga_indexed) +{ +if (tga_palette_len == 0) { /* you have to have at least one entry! */ +STBI_FREE(tga_data); +return stbi__errpuc("bad palette", "Corrupt TGA"); +} + +// any data to skip? (offset usually = 0) +stbi__skip(s, tga_palette_start ); +// load the palette +tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0); +if (!tga_palette) { +STBI_FREE(tga_data); +return stbi__errpuc("outofmem", "Out of memory"); +} +if (tga_rgb16) { +stbi_uc *pal_entry = tga_palette; +STBI_ASSERT(tga_comp == STBI_rgb); +for (i=0; i < tga_palette_len; ++i) { +stbi__tga_read_rgb16(s, pal_entry); +pal_entry += tga_comp; +} +} else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) { +STBI_FREE(tga_data); +STBI_FREE(tga_palette); +return stbi__errpuc("bad palette", "Corrupt TGA"); +} +} +// load the data +for (i=0; i < tga_width * tga_height; ++i) +{ +// if I'm in RLE mode, do I need to get a RLE stbi__pngchunk? +if ( tga_is_RLE ) +{ +if ( RLE_count == 0 ) +{ +// yep, get the next byte as a RLE command +int RLE_cmd = stbi__get8(s); +RLE_count = 1 + (RLE_cmd & 127); +RLE_repeating = RLE_cmd >> 7; +read_next_pixel = 1; +} else if ( !RLE_repeating ) +{ +read_next_pixel = 1; +} +} else +{ +read_next_pixel = 1; +} +// OK, if I need to read a pixel, do it now +if ( read_next_pixel ) +{ +// load however much data we did have +if ( tga_indexed ) +{ +// read in index, then perform the lookup +int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s); +if ( pal_idx >= tga_palette_len ) { +// invalid index +pal_idx = 0; +} +pal_idx *= tga_comp; +for (j = 0; j < tga_comp; ++j) { +raw_data[j] = tga_palette[pal_idx+j]; +} +} else if(tga_rgb16) { +STBI_ASSERT(tga_comp == STBI_rgb); +stbi__tga_read_rgb16(s, raw_data); +} else { +// read in the data raw +for (j = 0; j < tga_comp; ++j) { +raw_data[j] = stbi__get8(s); +} +} +// clear the reading flag for the next pixel +read_next_pixel = 0; +} // end of reading a pixel + +// copy data +for (j = 0; j < tga_comp; ++j) +tga_data[i*tga_comp+j] = raw_data[j]; + +// in case we're in RLE mode, keep counting down +--RLE_count; +} +// do I need to invert the image? +if ( tga_inverted ) +{ +for (j = 0; j*2 < tga_height; ++j) +{ +int index1 = j * tga_width * tga_comp; +int index2 = (tga_height - 1 - j) * tga_width * tga_comp; +for (i = tga_width * tga_comp; i > 0; --i) +{ +unsigned char temp = tga_data[index1]; +tga_data[index1] = tga_data[index2]; +tga_data[index2] = temp; +++index1; +++index2; +} +} +} +// clear my palette, if I had one +if ( tga_palette != NULL ) +{ +STBI_FREE( tga_palette ); +} +} + +// swap RGB - if the source data was RGB16, it already is in the right order +if (tga_comp >= 3 && !tga_rgb16) +{ +unsigned char* tga_pixel = tga_data; +for (i=0; i < tga_width * tga_height; ++i) +{ +unsigned char temp = tga_pixel[0]; +tga_pixel[0] = tga_pixel[2]; +tga_pixel[2] = temp; +tga_pixel += tga_comp; +} +} + +// convert to target component count +if (req_comp && req_comp != tga_comp) +tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height); + +// the things I do to get rid of an error message, and yet keep +// Microsoft's C compilers happy... [8^( +tga_palette_start = tga_palette_len = tga_palette_bits = +tga_x_origin = tga_y_origin = 0; +STBI_NOTUSED(tga_palette_start); +// OK, done +return tga_data; +} +#endif + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB + +#ifndef STBI_NO_PSD +static int stbi__psd_test(stbi__context *s) +{ +int r = (stbi__get32be(s) == 0x38425053); +stbi__rewind(s); +return r; +} + +static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount) +{ +int count, nleft, len; + +count = 0; +while ((nleft = pixelCount - count) > 0) { +len = stbi__get8(s); +if (len == 128) { +// No-op. +} else if (len < 128) { +// Copy next len+1 bytes literally. +len++; +if (len > nleft) return 0; // corrupt data +count += len; +while (len) { +*p = stbi__get8(s); +p += 4; +len--; +} +} else if (len > 128) { +stbi_uc val; +// Next -len+1 bytes in the dest are replicated from next source byte. +// (Interpret len as a negative 8-bit int.) +len = 257 - len; +if (len > nleft) return 0; // corrupt data +val = stbi__get8(s); +count += len; +while (len) { +*p = val; +p += 4; +len--; +} +} +} + +return 1; +} + +static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc) +{ +int pixelCount; +int channelCount, compression; +int channel, i; +int bitdepth; +int w,h; +stbi_uc *out; +STBI_NOTUSED(ri); + +// Check identifier +if (stbi__get32be(s) != 0x38425053) // "8BPS" +return stbi__errpuc("not PSD", "Corrupt PSD image"); + +// Check file type version. +if (stbi__get16be(s) != 1) +return stbi__errpuc("wrong version", "Unsupported version of PSD image"); + +// Skip 6 reserved bytes. +stbi__skip(s, 6 ); + +// Read the number of channels (R, G, B, A, etc). +channelCount = stbi__get16be(s); +if (channelCount < 0 || channelCount > 16) +return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image"); + +// Read the rows and columns of the image. +h = stbi__get32be(s); +w = stbi__get32be(s); + +if (h > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); +if (w > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + +// Make sure the depth is 8 bits. +bitdepth = stbi__get16be(s); +if (bitdepth != 8 && bitdepth != 16) +return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit"); + +// Make sure the color mode is RGB. +// Valid options are: +// 0: Bitmap +// 1: Grayscale +// 2: Indexed color +// 3: RGB color +// 4: CMYK color +// 7: Multichannel +// 8: Duotone +// 9: Lab color +if (stbi__get16be(s) != 3) +return stbi__errpuc("wrong color format", "PSD is not in RGB color format"); + +// Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) +stbi__skip(s,stbi__get32be(s) ); + +// Skip the image resources. (resolution, pen tool paths, etc) +stbi__skip(s, stbi__get32be(s) ); + +// Skip the reserved data. +stbi__skip(s, stbi__get32be(s) ); + +// Find out if the data is compressed. +// Known values: +// 0: no compression +// 1: RLE compressed +compression = stbi__get16be(s); +if (compression > 1) +return stbi__errpuc("bad compression", "PSD has an unknown compression format"); + +// Check size +if (!stbi__mad3sizes_valid(4, w, h, 0)) +return stbi__errpuc("too large", "Corrupt PSD"); + +// Create the destination image. + +if (!compression && bitdepth == 16 && bpc == 16) { +out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0); +ri->bits_per_channel = 16; +} else +out = (stbi_uc *) stbi__malloc(4 * w*h); + +if (!out) return stbi__errpuc("outofmem", "Out of memory"); +pixelCount = w*h; + +// Initialize the data to zero. +//memset( out, 0, pixelCount * 4 ); + +// Finally, the image data. +if (compression) { +// RLE as used by .PSD and .TIFF +// Loop until you get the number of unpacked bytes you are expecting: +// Read the next source byte into n. +// If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. +// Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. +// Else if n is 128, noop. +// Endloop + +// The RLE-compressed data is preceded by a 2-byte data count for each row in the data, +// which we're going to just skip. +stbi__skip(s, h * channelCount * 2 ); + +// Read the RLE data by channel. +for (channel = 0; channel < 4; channel++) { +stbi_uc *p; + +p = out+channel; +if (channel >= channelCount) { +// Fill this channel with default data. +for (i = 0; i < pixelCount; i++, p += 4) +*p = (channel == 3 ? 255 : 0); +} else { +// Read the RLE data. +if (!stbi__psd_decode_rle(s, p, pixelCount)) { +STBI_FREE(out); +return stbi__errpuc("corrupt", "bad RLE data"); +} +} +} + +} else { +// We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) +// where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image. + +// Read the data by channel. +for (channel = 0; channel < 4; channel++) { +if (channel >= channelCount) { +// Fill this channel with default data. +if (bitdepth == 16 && bpc == 16) { +stbi__uint16 *q = ((stbi__uint16 *) out) + channel; +stbi__uint16 val = channel == 3 ? 65535 : 0; +for (i = 0; i < pixelCount; i++, q += 4) +*q = val; +} else { +stbi_uc *p = out+channel; +stbi_uc val = channel == 3 ? 255 : 0; +for (i = 0; i < pixelCount; i++, p += 4) +*p = val; +} +} else { +if (ri->bits_per_channel == 16) { // output bpc +stbi__uint16 *q = ((stbi__uint16 *) out) + channel; +for (i = 0; i < pixelCount; i++, q += 4) +*q = (stbi__uint16) stbi__get16be(s); +} else { +stbi_uc *p = out+channel; +if (bitdepth == 16) { // input bpc +for (i = 0; i < pixelCount; i++, p += 4) +*p = (stbi_uc) (stbi__get16be(s) >> 8); +} else { +for (i = 0; i < pixelCount; i++, p += 4) +*p = stbi__get8(s); +} +} +} +} +} + +// remove weird white matte from PSD +if (channelCount >= 4) { +if (ri->bits_per_channel == 16) { +for (i=0; i < w*h; ++i) { +stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i; +if (pixel[3] != 0 && pixel[3] != 65535) { +float a = pixel[3] / 65535.0f; +float ra = 1.0f / a; +float inv_a = 65535.0f * (1 - ra); +pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a); +pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a); +pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a); +} +} +} else { +for (i=0; i < w*h; ++i) { +unsigned char *pixel = out + 4*i; +if (pixel[3] != 0 && pixel[3] != 255) { +float a = pixel[3] / 255.0f; +float ra = 1.0f / a; +float inv_a = 255.0f * (1 - ra); +pixel[0] = (unsigned char) (pixel[0]*ra + inv_a); +pixel[1] = (unsigned char) (pixel[1]*ra + inv_a); +pixel[2] = (unsigned char) (pixel[2]*ra + inv_a); +} +} +} +} + +// convert to desired output format +if (req_comp && req_comp != 4) { +if (ri->bits_per_channel == 16) +out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h); +else +out = stbi__convert_format(out, 4, req_comp, w, h); +if (out == NULL) return out; // stbi__convert_format frees input on failure +} + +if (comp) *comp = 4; +*y = h; +*x = w; + +return out; +} +#endif + +// ************************************************************************************************* +// Softimage PIC loader +// by Tom Seddon +// +// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format +// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ + +#ifndef STBI_NO_PIC +static int stbi__pic_is4(stbi__context *s,const char *str) +{ +int i; +for (i=0; i<4; ++i) +if (stbi__get8(s) != (stbi_uc)str[i]) +return 0; + +return 1; +} + +static int stbi__pic_test_core(stbi__context *s) +{ +int i; + +if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) +return 0; + +for(i=0;i<84;++i) +stbi__get8(s); + +if (!stbi__pic_is4(s,"PICT")) +return 0; + +return 1; +} + +typedef struct +{ +stbi_uc size,type,channel; +} stbi__pic_packet; + +static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest) +{ +int mask=0x80, i; + +for (i=0; i<4; ++i, mask>>=1) { +if (channel & mask) { +if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short"); +dest[i]=stbi__get8(s); +} +} + +return dest; +} + +static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src) +{ +int mask=0x80,i; + +for (i=0;i<4; ++i, mask>>=1) +if (channel&mask) +dest[i]=src[i]; +} + +static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result) +{ +int act_comp=0,num_packets=0,y,chained; +stbi__pic_packet packets[10]; + +// this will (should...) cater for even some bizarre stuff like having data +// for the same channel in multiple packets. +do { +stbi__pic_packet *packet; + +if (num_packets==sizeof(packets)/sizeof(packets[0])) +return stbi__errpuc("bad format","too many packets"); + +packet = &packets[num_packets++]; + +chained = stbi__get8(s); +packet->size = stbi__get8(s); +packet->type = stbi__get8(s); +packet->channel = stbi__get8(s); + +act_comp |= packet->channel; + +if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)"); +if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp"); +} while (chained); + +*comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? + +for(y=0; ytype) { +default: +return stbi__errpuc("bad format","packet has bad compression type"); + +case 0: {//uncompressed +int x; + +for(x=0;xchannel,dest)) +return 0; +break; +} + +case 1://Pure RLE +{ +int left=width, i; + +while (left>0) { +stbi_uc count,value[4]; + +count=stbi__get8(s); +if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); + +if (count > left) +count = (stbi_uc) left; + +if (!stbi__readval(s,packet->channel,value)) return 0; + +for(i=0; ichannel,dest,value); +left -= count; +} +} +break; + +case 2: {//Mixed RLE +int left=width; +while (left>0) { +int count = stbi__get8(s), i; +if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); + +if (count >= 128) { // Repeated +stbi_uc value[4]; + +if (count==128) +count = stbi__get16be(s); +else +count -= 127; +if (count > left) +return stbi__errpuc("bad file","scanline overrun"); + +if (!stbi__readval(s,packet->channel,value)) +return 0; + +for(i=0;ichannel,dest,value); +} else { // Raw +++count; +if (count>left) return stbi__errpuc("bad file","scanline overrun"); + +for(i=0;ichannel,dest)) +return 0; +} +left-=count; +} +break; +} +} +} +} + +return result; +} + +static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri) +{ +stbi_uc *result; +int i, x,y, internal_comp; +STBI_NOTUSED(ri); + +if (!comp) comp = &internal_comp; + +for (i=0; i<92; ++i) +stbi__get8(s); + +x = stbi__get16be(s); +y = stbi__get16be(s); + +if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); +if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + +if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); +if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode"); + +stbi__get32be(s); //skip `ratio' +stbi__get16be(s); //skip `fields' +stbi__get16be(s); //skip `pad' + +// intermediate buffer is RGBA +result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0); +if (!result) return stbi__errpuc("outofmem", "Out of memory"); +memset(result, 0xff, x*y*4); + +if (!stbi__pic_load_core(s,x,y,comp, result)) { +STBI_FREE(result); +result=0; +} +*px = x; +*py = y; +if (req_comp == 0) req_comp = *comp; +result=stbi__convert_format(result,4,req_comp,x,y); + +return result; +} + +static int stbi__pic_test(stbi__context *s) +{ +int r = stbi__pic_test_core(s); +stbi__rewind(s); +return r; +} +#endif + +// ************************************************************************************************* +// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb + +#ifndef STBI_NO_GIF +typedef struct +{ +stbi__int16 prefix; +stbi_uc first; +stbi_uc suffix; +} stbi__gif_lzw; + +typedef struct +{ +int w,h; +stbi_uc *out; // output buffer (always 4 components) +stbi_uc *background; // The current "background" as far as a gif is concerned +stbi_uc *history; +int flags, bgindex, ratio, transparent, eflags; +stbi_uc pal[256][4]; +stbi_uc lpal[256][4]; +stbi__gif_lzw codes[8192]; +stbi_uc *color_table; +int parse, step; +int lflags; +int start_x, start_y; +int max_x, max_y; +int cur_x, cur_y; +int line_size; +int delay; +} stbi__gif; + +static int stbi__gif_test_raw(stbi__context *s) +{ +int sz; +if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0; +sz = stbi__get8(s); +if (sz != '9' && sz != '7') return 0; +if (stbi__get8(s) != 'a') return 0; +return 1; +} + +static int stbi__gif_test(stbi__context *s) +{ +int r = stbi__gif_test_raw(s); +stbi__rewind(s); +return r; +} + +static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp) +{ +int i; +for (i=0; i < num_entries; ++i) { +pal[i][2] = stbi__get8(s); +pal[i][1] = stbi__get8(s); +pal[i][0] = stbi__get8(s); +pal[i][3] = transp == i ? 0 : 255; +} +} + +static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info) +{ +stbi_uc version; +if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') +return stbi__err("not GIF", "Corrupt GIF"); + +version = stbi__get8(s); +if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF"); +if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF"); + +stbi__g_failure_reason = ""; +g->w = stbi__get16le(s); +g->h = stbi__get16le(s); +g->flags = stbi__get8(s); +g->bgindex = stbi__get8(s); +g->ratio = stbi__get8(s); +g->transparent = -1; + +if (g->w > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); +if (g->h > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)"); + +if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments + +if (is_info) return 1; + +if (g->flags & 0x80) +stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); + +return 1; +} + +static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp) +{ +stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif)); +if (!g) return stbi__err("outofmem", "Out of memory"); +if (!stbi__gif_header(s, g, comp, 1)) { +STBI_FREE(g); +stbi__rewind( s ); +return 0; +} +if (x) *x = g->w; +if (y) *y = g->h; +STBI_FREE(g); +return 1; +} + +static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code) +{ +stbi_uc *p, *c; +int idx; + +// recurse to decode the prefixes, since the linked-list is backwards, +// and working backwards through an interleaved image would be nasty +if (g->codes[code].prefix >= 0) +stbi__out_gif_code(g, g->codes[code].prefix); + +if (g->cur_y >= g->max_y) return; + +idx = g->cur_x + g->cur_y; +p = &g->out[idx]; +g->history[idx / 4] = 1; + +c = &g->color_table[g->codes[code].suffix * 4]; +if (c[3] > 128) { // don't render transparent pixels; +p[0] = c[2]; +p[1] = c[1]; +p[2] = c[0]; +p[3] = c[3]; +} +g->cur_x += 4; + +if (g->cur_x >= g->max_x) { +g->cur_x = g->start_x; +g->cur_y += g->step; + +while (g->cur_y >= g->max_y && g->parse > 0) { +g->step = (1 << g->parse) * g->line_size; +g->cur_y = g->start_y + (g->step >> 1); +--g->parse; +} +} +} + +static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g) +{ +stbi_uc lzw_cs; +stbi__int32 len, init_code; +stbi__uint32 first; +stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; +stbi__gif_lzw *p; + +lzw_cs = stbi__get8(s); +if (lzw_cs > 12) return NULL; +clear = 1 << lzw_cs; +first = 1; +codesize = lzw_cs + 1; +codemask = (1 << codesize) - 1; +bits = 0; +valid_bits = 0; +for (init_code = 0; init_code < clear; init_code++) { +g->codes[init_code].prefix = -1; +g->codes[init_code].first = (stbi_uc) init_code; +g->codes[init_code].suffix = (stbi_uc) init_code; +} + +// support no starting clear code +avail = clear+2; +oldcode = -1; + +len = 0; +for(;;) { +if (valid_bits < codesize) { +if (len == 0) { +len = stbi__get8(s); // start new block +if (len == 0) +return g->out; +} +--len; +bits |= (stbi__int32) stbi__get8(s) << valid_bits; +valid_bits += 8; +} else { +stbi__int32 code = bits & codemask; +bits >>= codesize; +valid_bits -= codesize; +// @OPTIMIZE: is there some way we can accelerate the non-clear path? +if (code == clear) { // clear code +codesize = lzw_cs + 1; +codemask = (1 << codesize) - 1; +avail = clear + 2; +oldcode = -1; +first = 0; +} else if (code == clear + 1) { // end of stream code +stbi__skip(s, len); +while ((len = stbi__get8(s)) > 0) +stbi__skip(s,len); +return g->out; +} else if (code <= avail) { +if (first) { +return stbi__errpuc("no clear code", "Corrupt GIF"); +} + +if (oldcode >= 0) { +p = &g->codes[avail++]; +if (avail > 8192) { +return stbi__errpuc("too many codes", "Corrupt GIF"); +} + +p->prefix = (stbi__int16) oldcode; +p->first = g->codes[oldcode].first; +p->suffix = (code == avail) ? p->first : g->codes[code].first; +} else if (code == avail) +return stbi__errpuc("illegal code in raster", "Corrupt GIF"); + +stbi__out_gif_code(g, (stbi__uint16) code); + +if ((avail & codemask) == 0 && avail <= 0x0FFF) { +codesize++; +codemask = (1 << codesize) - 1; +} + +oldcode = code; +} else { +return stbi__errpuc("illegal code in raster", "Corrupt GIF"); +} +} +} +} + +// this function is designed to support animated gifs, although stb_image doesn't support it +// two back is the image from two frames ago, used for a very specific disposal format +static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp, stbi_uc *two_back) +{ +int dispose; +int first_frame; +int pi; +int pcount; +STBI_NOTUSED(req_comp); + +// on first frame, any non-written pixels get the background colour (non-transparent) +first_frame = 0; +if (g->out == 0) { +if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header +if (!stbi__mad3sizes_valid(4, g->w, g->h, 0)) +return stbi__errpuc("too large", "GIF image is too large"); +pcount = g->w * g->h; +g->out = (stbi_uc *) stbi__malloc(4 * pcount); +g->background = (stbi_uc *) stbi__malloc(4 * pcount); +g->history = (stbi_uc *) stbi__malloc(pcount); +if (!g->out || !g->background || !g->history) +return stbi__errpuc("outofmem", "Out of memory"); + +// image is treated as "transparent" at the start - ie, nothing overwrites the current background; +// background colour is only used for pixels that are not rendered first frame, after that "background" +// color refers to the color that was there the previous frame. +memset(g->out, 0x00, 4 * pcount); +memset(g->background, 0x00, 4 * pcount); // state of the background (starts transparent) +memset(g->history, 0x00, pcount); // pixels that were affected previous frame +first_frame = 1; +} else { +// second frame - how do we dispose of the previous one? +dispose = (g->eflags & 0x1C) >> 2; +pcount = g->w * g->h; + +if ((dispose == 3) && (two_back == 0)) { +dispose = 2; // if I don't have an image to revert back to, default to the old background +} + +if (dispose == 3) { // use previous graphic +for (pi = 0; pi < pcount; ++pi) { +if (g->history[pi]) { +memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 ); +} +} +} else if (dispose == 2) { +// restore what was changed last frame to background before that frame; +for (pi = 0; pi < pcount; ++pi) { +if (g->history[pi]) { +memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 ); +} +} +} else { +// This is a non-disposal case eithe way, so just +// leave the pixels as is, and they will become the new background +// 1: do not dispose +// 0: not specified. +} + +// background is what out is after the undoing of the previou frame; +memcpy( g->background, g->out, 4 * g->w * g->h ); +} + +// clear my history; +memset( g->history, 0x00, g->w * g->h ); // pixels that were affected previous frame + +for (;;) { +int tag = stbi__get8(s); +switch (tag) { +case 0x2C: /* Image Descriptor */ +{ +stbi__int32 x, y, w, h; +stbi_uc *o; + +x = stbi__get16le(s); +y = stbi__get16le(s); +w = stbi__get16le(s); +h = stbi__get16le(s); +if (((x + w) > (g->w)) || ((y + h) > (g->h))) +return stbi__errpuc("bad Image Descriptor", "Corrupt GIF"); + +g->line_size = g->w * 4; +g->start_x = x * 4; +g->start_y = y * g->line_size; +g->max_x = g->start_x + w * 4; +g->max_y = g->start_y + h * g->line_size; +g->cur_x = g->start_x; +g->cur_y = g->start_y; + +// if the width of the specified rectangle is 0, that means +// we may not see *any* pixels or the image is malformed; +// to make sure this is caught, move the current y down to +// max_y (which is what out_gif_code checks). +if (w == 0) +g->cur_y = g->max_y; + +g->lflags = stbi__get8(s); + +if (g->lflags & 0x40) { +g->step = 8 * g->line_size; // first interlaced spacing +g->parse = 3; +} else { +g->step = g->line_size; +g->parse = 0; +} + +if (g->lflags & 0x80) { +stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); +g->color_table = (stbi_uc *) g->lpal; +} else if (g->flags & 0x80) { +g->color_table = (stbi_uc *) g->pal; +} else +return stbi__errpuc("missing color table", "Corrupt GIF"); + +o = stbi__process_gif_raster(s, g); +if (!o) return NULL; + +// if this was the first frame, +pcount = g->w * g->h; +if (first_frame && (g->bgindex > 0)) { +// if first frame, any pixel not drawn to gets the background color +for (pi = 0; pi < pcount; ++pi) { +if (g->history[pi] == 0) { +g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be; +memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 ); +} +} +} + +return o; +} + +case 0x21: // Comment Extension. +{ +int len; +int ext = stbi__get8(s); +if (ext == 0xF9) { // Graphic Control Extension. +len = stbi__get8(s); +if (len == 4) { +g->eflags = stbi__get8(s); +g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second, saving as 1/1000ths. + +// unset old transparent +if (g->transparent >= 0) { +g->pal[g->transparent][3] = 255; +} +if (g->eflags & 0x01) { +g->transparent = stbi__get8(s); +if (g->transparent >= 0) { +g->pal[g->transparent][3] = 0; +} +} else { +// don't need transparent +stbi__skip(s, 1); +g->transparent = -1; +} +} else { +stbi__skip(s, len); +break; +} +} +while ((len = stbi__get8(s)) != 0) { +stbi__skip(s, len); +} +break; +} + +case 0x3B: // gif stream termination code +return (stbi_uc *) s; // using '1' causes warning on some compilers + +default: +return stbi__errpuc("unknown code", "Corrupt GIF"); +} +} +} + +static void *stbi__load_gif_main_outofmem(stbi__gif *g, stbi_uc *out, int **delays) +{ +STBI_FREE(g->out); +STBI_FREE(g->history); +STBI_FREE(g->background); + +if (out) STBI_FREE(out); +if (delays && *delays) STBI_FREE(*delays); +return stbi__errpuc("outofmem", "Out of memory"); +} + +static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp) +{ +if (stbi__gif_test(s)) { +int layers = 0; +stbi_uc *u = 0; +stbi_uc *out = 0; +stbi_uc *two_back = 0; +stbi__gif g; +int stride; +int out_size = 0; +int delays_size = 0; + +STBI_NOTUSED(out_size); +STBI_NOTUSED(delays_size); + +memset(&g, 0, sizeof(g)); +if (delays) { +*delays = 0; +} + +do { +u = stbi__gif_load_next(s, &g, comp, req_comp, two_back); +if (u == (stbi_uc *) s) u = 0; // end of animated gif marker + +if (u) { +*x = g.w; +*y = g.h; +++layers; +stride = g.w * g.h * 4; + +if (out) { +void *tmp = (stbi_uc*) STBI_REALLOC_SIZED( out, out_size, layers * stride ); +if (!tmp) +return stbi__load_gif_main_outofmem(&g, out, delays); +else { +out = (stbi_uc*) tmp; +out_size = layers * stride; +} + +if (delays) { +int *new_delays = (int*) STBI_REALLOC_SIZED( *delays, delays_size, sizeof(int) * layers ); +if (!new_delays) +return stbi__load_gif_main_outofmem(&g, out, delays); +*delays = new_delays; +delays_size = layers * sizeof(int); +} +} else { +out = (stbi_uc*)stbi__malloc( layers * stride ); +if (!out) +return stbi__load_gif_main_outofmem(&g, out, delays); +out_size = layers * stride; +if (delays) { +*delays = (int*) stbi__malloc( layers * sizeof(int) ); +if (!*delays) +return stbi__load_gif_main_outofmem(&g, out, delays); +delays_size = layers * sizeof(int); +} +} +memcpy( out + ((layers - 1) * stride), u, stride ); +if (layers >= 2) { +two_back = out - 2 * stride; +} + +if (delays) { +(*delays)[layers - 1U] = g.delay; +} +} +} while (u != 0); + +// free temp buffer; +STBI_FREE(g.out); +STBI_FREE(g.history); +STBI_FREE(g.background); + +// do the final conversion after loading everything; +if (req_comp && req_comp != 4) +out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h); + +*z = layers; +return out; +} else { +return stbi__errpuc("not GIF", "Image was not as a gif type."); +} +} + +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +stbi_uc *u = 0; +stbi__gif g; +memset(&g, 0, sizeof(g)); +STBI_NOTUSED(ri); + +u = stbi__gif_load_next(s, &g, comp, req_comp, 0); +if (u == (stbi_uc *) s) u = 0; // end of animated gif marker +if (u) { +*x = g.w; +*y = g.h; + +// moved conversion to after successful load so that the same +// can be done for multiple frames. +if (req_comp && req_comp != 4) +u = stbi__convert_format(u, 4, req_comp, g.w, g.h); +} else if (g.out) { +// if there was an error and we allocated an image buffer, free it! +STBI_FREE(g.out); +} + +// free buffers needed for multiple frame loading; +STBI_FREE(g.history); +STBI_FREE(g.background); + +return u; +} + +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) +{ +return stbi__gif_info_raw(s,x,y,comp); +} +#endif + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int stbi__hdr_test_core(stbi__context *s, const char *signature) +{ +int i; +for (i=0; signature[i]; ++i) +if (stbi__get8(s) != signature[i]) +return 0; +stbi__rewind(s); +return 1; +} + +static int stbi__hdr_test(stbi__context* s) +{ +int r = stbi__hdr_test_core(s, "#?RADIANCE\n"); +stbi__rewind(s); +if(!r) { +r = stbi__hdr_test_core(s, "#?RGBE\n"); +stbi__rewind(s); +} +return r; +} + +#define STBI__HDR_BUFLEN 1024 +static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) +{ +int len=0; +char c = '\0'; + +c = (char) stbi__get8(z); + +while (!stbi__at_eof(z) && c != '\n') { +buffer[len++] = c; +if (len == STBI__HDR_BUFLEN-1) { +// flush to end of line +while (!stbi__at_eof(z) && stbi__get8(z) != '\n') +; +break; +} +c = (char) stbi__get8(z); +} + +buffer[len] = 0; +return buffer; +} + +static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) +{ +if ( input[3] != 0 ) { +float f1; +// Exponent +f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); +if (req_comp <= 2) +output[0] = (input[0] + input[1] + input[2]) * f1 / 3; +else { +output[0] = input[0] * f1; +output[1] = input[1] * f1; +output[2] = input[2] * f1; +} +if (req_comp == 2) output[1] = 1; +if (req_comp == 4) output[3] = 1; +} else { +switch (req_comp) { +case 4: output[3] = 1; /* fallthrough */ +case 3: output[0] = output[1] = output[2] = 0; +break; +case 2: output[1] = 1; /* fallthrough */ +case 1: output[0] = 0; +break; +} +} +} + +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +char buffer[STBI__HDR_BUFLEN]; +char *token; +int valid = 0; +int width, height; +stbi_uc *scanline; +float *hdr_data; +int len; +unsigned char count, value; +int i, j, k, c1,c2, z; +const char *headerToken; +STBI_NOTUSED(ri); + +// Check identifier +headerToken = stbi__hdr_gettoken(s,buffer); +if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0) +return stbi__errpf("not HDR", "Corrupt HDR image"); + +// Parse header +for(;;) { +token = stbi__hdr_gettoken(s,buffer); +if (token[0] == 0) break; +if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; +} + +if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); + +// Parse width and height +// can't use sscanf() if we're not using stdio! +token = stbi__hdr_gettoken(s,buffer); +if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); +token += 3; +height = (int) strtol(token, &token, 10); +while (*token == ' ') ++token; +if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); +token += 3; +width = (int) strtol(token, NULL, 10); + +if (height > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)"); +if (width > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)"); + +*x = width; +*y = height; + +if (comp) *comp = 3; +if (req_comp == 0) req_comp = 3; + +if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0)) +return stbi__errpf("too large", "HDR image is too large"); + +// Read data +hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0); +if (!hdr_data) +return stbi__errpf("outofmem", "Out of memory"); + +// Load image data +// image data is stored as some number of sca +if ( width < 8 || width >= 32768) { +// Read flat data +for (j=0; j < height; ++j) { +for (i=0; i < width; ++i) { +stbi_uc rgbe[4]; +main_decode_loop: +stbi__getn(s, rgbe, 4); +stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); +} +} +} else { +// Read RLE-encoded data +scanline = NULL; + +for (j = 0; j < height; ++j) { +c1 = stbi__get8(s); +c2 = stbi__get8(s); +len = stbi__get8(s); +if (c1 != 2 || c2 != 2 || (len & 0x80)) { +// not run-length encoded, so we have to actually use THIS data as a decoded +// pixel (note this can't be a valid pixel--one of RGB must be >= 128) +stbi_uc rgbe[4]; +rgbe[0] = (stbi_uc) c1; +rgbe[1] = (stbi_uc) c2; +rgbe[2] = (stbi_uc) len; +rgbe[3] = (stbi_uc) stbi__get8(s); +stbi__hdr_convert(hdr_data, rgbe, req_comp); +i = 1; +j = 0; +STBI_FREE(scanline); +goto main_decode_loop; // yes, this makes no sense +} +len <<= 8; +len |= stbi__get8(s); +if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); } +if (scanline == NULL) { +scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0); +if (!scanline) { +STBI_FREE(hdr_data); +return stbi__errpf("outofmem", "Out of memory"); +} +} + +for (k = 0; k < 4; ++k) { +int nleft; +i = 0; +while ((nleft = width - i) > 0) { +count = stbi__get8(s); +if (count > 128) { +// Run +value = stbi__get8(s); +count -= 128; +if (count > 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); +if (p == NULL) { +stbi__rewind( s ); +return 0; +} +if (x) *x = s->img_x; +if (y) *y = s->img_y; +if (comp) { +if (info.bpp == 24 && info.ma == 0xff000000) +*comp = 3; +else +*comp = info.ma ? 4 : 3; +} +return 1; +} +#endif + +#ifndef STBI_NO_PSD +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) +{ +int channelCount, dummy, depth; +if (!x) x = &dummy; +if (!y) y = &dummy; +if (!comp) comp = &dummy; +if (stbi__get32be(s) != 0x38425053) { +stbi__rewind( s ); +return 0; +} +if (stbi__get16be(s) != 1) { +stbi__rewind( s ); +return 0; +} +stbi__skip(s, 6); +channelCount = stbi__get16be(s); +if (channelCount < 0 || channelCount > 16) { +stbi__rewind( s ); +return 0; +} +*y = stbi__get32be(s); +*x = stbi__get32be(s); +depth = stbi__get16be(s); +if (depth != 8 && depth != 16) { +stbi__rewind( s ); +return 0; +} +if (stbi__get16be(s) != 3) { +stbi__rewind( s ); +return 0; +} +*comp = 4; +return 1; +} + +static int stbi__psd_is16(stbi__context *s) +{ +int channelCount, depth; +if (stbi__get32be(s) != 0x38425053) { +stbi__rewind( s ); +return 0; +} +if (stbi__get16be(s) != 1) { +stbi__rewind( s ); +return 0; +} +stbi__skip(s, 6); +channelCount = stbi__get16be(s); +if (channelCount < 0 || channelCount > 16) { +stbi__rewind( s ); +return 0; +} +STBI_NOTUSED(stbi__get32be(s)); +STBI_NOTUSED(stbi__get32be(s)); +depth = stbi__get16be(s); +if (depth != 16) { +stbi__rewind( s ); +return 0; +} +return 1; +} +#endif + +#ifndef STBI_NO_PIC +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) +{ +int act_comp=0,num_packets=0,chained,dummy; +stbi__pic_packet packets[10]; + +if (!x) x = &dummy; +if (!y) y = &dummy; +if (!comp) comp = &dummy; + +if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { +stbi__rewind(s); +return 0; +} + +stbi__skip(s, 88); + +*x = stbi__get16be(s); +*y = stbi__get16be(s); +if (stbi__at_eof(s)) { +stbi__rewind( s); +return 0; +} +if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { +stbi__rewind( s ); +return 0; +} + +stbi__skip(s, 8); + +do { +stbi__pic_packet *packet; + +if (num_packets==sizeof(packets)/sizeof(packets[0])) +return 0; + +packet = &packets[num_packets++]; +chained = stbi__get8(s); +packet->size = stbi__get8(s); +packet->type = stbi__get8(s); +packet->channel = stbi__get8(s); +act_comp |= packet->channel; + +if (stbi__at_eof(s)) { +stbi__rewind( s ); +return 0; +} +if (packet->size != 8) { +stbi__rewind( s ); +return 0; +} +} while (chained); + +*comp = (act_comp & 0x10 ? 4 : 3); + +return 1; +} +#endif + +// ************************************************************************************************* +// Portable Gray Map and Portable Pixel Map loader +// by Ken Miller +// +// PGM: http://netpbm.sourceforge.net/doc/pgm.html +// PPM: http://netpbm.sourceforge.net/doc/ppm.html +// +// Known limitations: +// Does not support comments in the header section +// Does not support ASCII image data (formats P2 and P3) + +#ifndef STBI_NO_PNM + +static int stbi__pnm_test(stbi__context *s) +{ +char p, t; +p = (char) stbi__get8(s); +t = (char) stbi__get8(s); +if (p != 'P' || (t != '5' && t != '6')) { +stbi__rewind( s ); +return 0; +} +return 1; +} + +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) +{ +stbi_uc *out; +STBI_NOTUSED(ri); + +ri->bits_per_channel = stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n); +if (ri->bits_per_channel == 0) +return 0; + +if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); +if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); + +*x = s->img_x; +*y = s->img_y; +if (comp) *comp = s->img_n; + +if (!stbi__mad4sizes_valid(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0)) +return stbi__errpuc("too large", "PNM too large"); + +out = (stbi_uc *) stbi__malloc_mad4(s->img_n, s->img_x, s->img_y, ri->bits_per_channel / 8, 0); +if (!out) return stbi__errpuc("outofmem", "Out of memory"); +stbi__getn(s, out, s->img_n * s->img_x * s->img_y * (ri->bits_per_channel / 8)); + +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 > 65535) +return stbi__err("max value > 65535", "PPM image supports only 8-bit and 16-bit images"); +else if (maxv > 255) +return 16; +else +return 8; +} + +static int stbi__pnm_is16(stbi__context *s) +{ +if (stbi__pnm_info(s, NULL, NULL, NULL) == 16) +return 1; +return 0; +} +#endif + +static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) +{ +#ifndef STBI_NO_JPEG +if (stbi__jpeg_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_PNG +if (stbi__png_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_GIF +if (stbi__gif_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_BMP +if (stbi__bmp_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_PSD +if (stbi__psd_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_PIC +if (stbi__pic_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_PNM +if (stbi__pnm_info(s, x, y, comp)) return 1; +#endif + +#ifndef STBI_NO_HDR +if (stbi__hdr_info(s, x, y, comp)) return 1; +#endif + +// test tga last because it's a crappy test! +#ifndef STBI_NO_TGA +if (stbi__tga_info(s, x, y, comp)) +return 1; +#endif +return stbi__err("unknown image type", "Image not of any known type, or corrupt"); +} + +static int stbi__is_16_main(stbi__context *s) +{ +#ifndef STBI_NO_PNG +if (stbi__png_is16(s)) return 1; +#endif + +#ifndef STBI_NO_PSD +if (stbi__psd_is16(s)) return 1; +#endif + +#ifndef STBI_NO_PNM +if (stbi__pnm_is16(s)) return 1; +#endif +return 0; +} + +#ifndef STBI_NO_STDIO +STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) +{ +FILE *f = stbi__fopen(filename, "rb"); +int result; +if (!f) return stbi__err("can't fopen", "Unable to open file"); +result = stbi_info_from_file(f, x, y, comp); +fclose(f); +return result; +} + +STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) +{ +int r; +stbi__context s; +long pos = ftell(f); +stbi__start_file(&s, f); +r = stbi__info_main(&s,x,y,comp); +fseek(f,pos,SEEK_SET); +return r; +} + +STBIDEF int stbi_is_16_bit(char const *filename) +{ +FILE *f = stbi__fopen(filename, "rb"); +int result; +if (!f) return stbi__err("can't fopen", "Unable to open file"); +result = stbi_is_16_bit_from_file(f); +fclose(f); +return result; +} + +STBIDEF int stbi_is_16_bit_from_file(FILE *f) +{ +int r; +stbi__context s; +long pos = ftell(f); +stbi__start_file(&s, f); +r = stbi__is_16_main(&s); +fseek(f,pos,SEEK_SET); +return r; +} +#endif // !STBI_NO_STDIO + +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) +{ +stbi__context s; +stbi__start_mem(&s,buffer,len); +return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) +{ +stbi__context s; +stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); +return stbi__info_main(&s,x,y,comp); +} + +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len) +{ +stbi__context s; +stbi__start_mem(&s,buffer,len); +return stbi__is_16_main(&s); +} + +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user) +{ +stbi__context s; +stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); +return stbi__is_16_main(&s); +} + +#endif // STB_IMAGE_IMPLEMENTATION + +/* +revision history: +2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs +2.19 (2018-02-11) fix warning +2.18 (2018-01-30) fix warnings +2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug +1-bit BMP +*_is_16_bit api +avoid warnings +2.16 (2017-07-23) all functions have 16-bit variants; +STBI_NO_STDIO works again; +compilation fixes; +fix rounding in unpremultiply; +optimize vertical flip; +disable raw_len validation; +documentation fixes +2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode; +warning fixes; disable run-time SSE detection on gcc; +uniform handling of optional "return" values; +thread-safe initialization of zlib tables +2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs +2.13 (2016-11-29) add 16-bit API, only supported for PNG right now +2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes +2.11 (2016-04-02) allocate large structures on the stack +remove white matting for transparent PSD +fix reported channel count for PNG & BMP +re-enable SSE2 in non-gcc 64-bit +support RGB-formatted JPEG +read 16-bit PNGs (only as 8-bit) +2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED +2.09 (2016-01-16) allow comments in PNM files +16-bit-per-pixel TGA (not bit-per-component) +info() for TGA could break due to .hdr handling +info() for BMP to shares code instead of sloppy parse +can use STBI_REALLOC_SIZED if allocator doesn't support realloc +code cleanup +2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA +2.07 (2015-09-13) fix compiler warnings +partial animated GIF support +limited 16-bpc PSD support +#ifdef unused functions +bug with < 92 byte PIC,PNM,HDR,TGA +2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value +2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning +2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit +2.03 (2015-04-12) extra corruption checking (mmozeiko) +stbi_set_flip_vertically_on_load (nguillemot) +fix NEON support; fix mingw support +2.02 (2015-01-19) fix incorrect assert, fix warning +2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 +2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG +2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) +progressive JPEG (stb) +PGM/PPM support (Ken Miller) +STBI_MALLOC,STBI_REALLOC,STBI_FREE +GIF bugfix -- seemingly never worked +STBI_NO_*, STBI_ONLY_* +1.48 (2014-12-14) fix incorrectly-named assert() +1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) +optimize PNG (ryg) +fix bug in interlaced PNG with user-specified channel count (stb) +1.46 (2014-08-26) +fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG +1.45 (2014-08-16) +fix MSVC-ARM internal compiler error by wrapping malloc +1.44 (2014-08-07) +various warning fixes from Ronny Chevalier +1.43 (2014-07-15) +fix MSVC-only compiler problem in code changed in 1.42 +1.42 (2014-07-09) +don't define _CRT_SECURE_NO_WARNINGS (affects user code) +fixes to stbi__cleanup_jpeg path +added STBI_ASSERT to avoid requiring assert.h +1.41 (2014-06-25) +fix search&replace from 1.36 that messed up comments/error messages +1.40 (2014-06-22) +fix gcc struct-initialization warning +1.39 (2014-06-15) +fix to TGA optimization when req_comp != number of components in TGA; +fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) +add support for BMP version 5 (more ignored fields) +1.38 (2014-06-06) +suppress MSVC warnings on integer casts truncating values +fix accidental rename of 'skip' field of I/O +1.37 (2014-06-04) +remove duplicate typedef +1.36 (2014-06-03) +convert to header file single-file library +if de-iphone isn't set, load iphone images color-swapped instead of returning NULL +1.35 (2014-05-27) +various warnings +fix broken STBI_SIMD path +fix bug where stbi_load_from_file no longer left file pointer in correct place +fix broken non-easy path for 32-bit BMP (possibly never used) +TGA optimization by Arseny Kapoulkine +1.34 (unknown) +use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case +1.33 (2011-07-14) +make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements +1.32 (2011-07-13) +support for "info" function for all supported filetypes (SpartanJ) +1.31 (2011-06-20) +a few more leak fixes, bug in PNG handling (SpartanJ) +1.30 (2011-06-11) +added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) +removed deprecated format-specific test/load functions +removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway +error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) +fix inefficiency in decoding 32-bit BMP (David Woo) +1.29 (2010-08-16) +various warning fixes from Aurelien Pocheville +1.28 (2010-08-01) +fix bug in GIF palette transparency (SpartanJ) +1.27 (2010-08-01) +cast-to-stbi_uc to fix warnings +1.26 (2010-07-24) +fix bug in file buffering for PNG reported by SpartanJ +1.25 (2010-07-17) +refix trans_data warning (Won Chun) +1.24 (2010-07-12) +perf improvements reading from files on platforms with lock-heavy fgetc() +minor perf improvements for jpeg +deprecated type-specific functions so we'll get feedback if they're needed +attempt to fix trans_data warning (Won Chun) +1.23 fixed bug in iPhone support +1.22 (2010-07-10) +removed image *writing* support +stbi_info support from Jetro Lauha +GIF support from Jean-Marc Lienher +iPhone PNG-extensions from James Brown +warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) +1.21 fix use of 'stbi_uc' in header (reported by jon blow) +1.20 added support for Softimage PIC, by Tom Seddon +1.19 bug in interlaced PNG corruption check (found by ryg) +1.18 (2008-08-02) +fix a threading bug (local mutable static) +1.17 support interlaced PNG +1.16 major bugfix - stbi__convert_format converted one too many pixels +1.15 initialize some fields for thread safety +1.14 fix threadsafe conversion bug +header-file-only version (#define STBI_HEADER_FILE_ONLY before including) +1.13 threadsafe +1.12 const qualifiers in the API +1.11 Support installable IDCT, colorspace conversion routines +1.10 Fixes for 64-bit (don't use "unsigned long") +optimized upsampling by Fabian "ryg" Giesen +1.09 Fix format-conversion for PSD code (bad global variables!) +1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz +1.07 attempt to fix C++ warning/errors again +1.06 attempt to fix C++ warning/errors again +1.05 fix TGA loading to return correct *comp and use good luminance calc +1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free +1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR +1.02 support for (subset of) HDR files, float interface for preferred access to them +1.01 fix bug: possible bug in handling right-side up bmps... not sure +fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all +1.00 interface to zlib that skips zlib header +0.99 correct handling of alpha in palette +0.98 TGA loader by lonesock; dynamically add loaders (untested) +0.97 jpeg errors on too large a file; also catch another malloc failure +0.96 fix detection of invalid v value - particleman@mollyrocket forum +0.95 during header scan, seek to markers in case of padding +0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same +0.93 handle jpegtran output; verbose errors +0.92 read 4,8,16,24,32-bit BMP files of several formats +0.91 output 24-bit Windows 3.0 BMP files +0.90 fix a few more warnings; bump version number to approach 1.0 +0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd +0.60 fix compiling as c++ +0.59 fix warnings: merge Dave Moore's -Wall fixes +0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian +0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available +0.56 fix bug: zlib uncompressed mode len vs. nlen +0.55 fix bug: restart_interval not initialized to 0 +0.54 allow NULL for 'int *comp' +0.53 fix bug in png 3->4; speedup png decoding +0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments +0.51 obey req_comp requests, 1-component jpegs return as 1-component, +on 'test' only check type, not whether we support this variant +0.50 (2006-11-19) +first released version +*/ + + +/* +------------------------------------------------------------------------------ +This software is available under 2 licenses -- choose whichever you prefer. +------------------------------------------------------------------------------ +ALTERNATIVE A - MIT License +Copyright (c) 2017 Sean Barrett +Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions: +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +------------------------------------------------------------------------------ +ALTERNATIVE B - Public Domain (www.unlicense.org) +This is free and unencumbered software released into the public domain. +Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means. +In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law. +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +------------------------------------------------------------------------------ +*/ diff --git a/Vulkan/res/shaders/compile.bat b/Vulkan/res/shaders/compile.bat deleted file mode 100644 index 53f0aa9..0000000 --- a/Vulkan/res/shaders/compile.bat +++ /dev/null @@ -1,3 +0,0 @@ -glslc shader.vert -o vert.spv -glslc shader.frag -o frag.spv -pause \ No newline at end of file diff --git a/Vulkan/res/shaders/shader.vert b/Vulkan/res/shaders/shader.vert index e368b85..00a3fb8 100644 --- a/Vulkan/res/shaders/shader.vert +++ b/Vulkan/res/shaders/shader.vert @@ -1,10 +1,11 @@ #version 450 -layout(binding = 0) uniform UniformBufferObject +layout(set = 0, binding = 0) uniform SceneUniformBufferObject { - mat4 model; - mat4 view; mat4 projection; + mat4 view; + mat4 model; + vec3 lightPos; } ubo; layout(location = 0) in vec2 inPosition; @@ -13,6 +14,6 @@ layout(location = 1) in vec3 inColor; layout(location = 0) out vec3 fragColor; void main() { - gl_Position = ubo.projection * ubo.view * ubo.model * vec4(inPosition, 0.0, 1.0); + gl_Position = ubo.projection * ubo.view * ubo.model * vec4(inPosition.x, 0.0, inPosition.y, 1.0); fragColor = inColor; } \ No newline at end of file diff --git a/Vulkan/res/shaders/vert.spv b/Vulkan/res/shaders/vert.spv index 4092755..f7d1531 100644 Binary files a/Vulkan/res/shaders/vert.spv and b/Vulkan/res/shaders/vert.spv differ diff --git a/Vulkan/src/Pipeline.h b/Vulkan/src/Pipeline.h index a5b0bc1..a68228f 100644 --- a/Vulkan/src/Pipeline.h +++ b/Vulkan/src/Pipeline.h @@ -15,8 +15,8 @@ class Pipeline private: Instance& instance; - std::map vertexDescriptorSetLayouts; - std::map fragmentDescriptorSetLayouts; + VkDescriptorSetLayout vertexDescriptorSetLayout; + VkDescriptorSetLayout fragmentDescriptorSetLayout; VkPipelineLayout pipelineLayout; VkPipeline graphicsPipeline; @@ -32,14 +32,8 @@ public: { vkDestroyPipeline(instance.GetDevice(), graphicsPipeline, nullptr); vkDestroyPipelineLayout(instance.GetDevice(), pipelineLayout, nullptr); - for (auto&& descriptorSetLayout : vertexDescriptorSetLayouts) - { - vkDestroyDescriptorSetLayout(instance.GetDevice(), descriptorSetLayout.second, nullptr); - } - for (auto&& descriptorSetLayout : fragmentDescriptorSetLayouts) - { - vkDestroyDescriptorSetLayout(instance.GetDevice(), descriptorSetLayout.second, nullptr); - } + vkDestroyDescriptorSetLayout(instance.GetDevice(), vertexDescriptorSetLayout, nullptr); + vkDestroyDescriptorSetLayout(instance.GetDevice(), fragmentDescriptorSetLayout, nullptr); } void Bind(VkCommandBuffer commandBuffer) @@ -65,35 +59,21 @@ public: return pipelineLayout; } - VkDescriptorSetLayout GetVertexDescriptorSetLayout(uint32_t binding) + VkDescriptorSetLayout GetVertexDescriptorSetLayout() { - return vertexDescriptorSetLayouts.at(binding); + return vertexDescriptorSetLayout; } - VkDescriptorSetLayout GetFragmentDescriptorSetLayout(uint32_t binding) + VkDescriptorSetLayout GetFragmentDescriptorSetLayout() { - return fragmentDescriptorSetLayouts.at(binding); + return fragmentDescriptorSetLayout; } private: void InitializeDescriptorSetLayouts(const PipelineCreator& creator) { - { - int i = 0; - for (auto& binding : creator.vertexDescriptorSetLayouts) - { - vertexDescriptorSetLayouts.emplace(binding, InitializeDescriptorSetLayout(binding, VK_SHADER_STAGE_VERTEX_BIT)); - i++; - } - } - { - int i = 0; - for (auto& binding : creator.fragmentDescriptorSetLayouts) - { - fragmentDescriptorSetLayouts.emplace(binding, InitializeDescriptorSetLayout(binding, VK_SHADER_STAGE_FRAGMENT_BIT)); - i++; - } - } + vertexDescriptorSetLayout = InitializeDescriptorSetLayouts(creator.vertexDescriptorSetLayouts, VK_SHADER_STAGE_VERTEX_BIT); + fragmentDescriptorSetLayout = InitializeDescriptorSetLayouts(creator.fragmentDescriptorSetLayouts, VK_SHADER_STAGE_FRAGMENT_BIT); } void InitializePipeline(const PipelineCreator& creator) @@ -119,10 +99,10 @@ private: VkPipelineVertexInputStateCreateInfo vertexInputCreateInfo{}; vertexInputCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO; - vertexInputCreateInfo.vertexBindingDescriptionCount = 1; - vertexInputCreateInfo.pVertexBindingDescriptions = &creator.vertexInputBindingDescription; - vertexInputCreateInfo.vertexAttributeDescriptionCount = creator.vertexInputAttributeDescriptions.size(); - vertexInputCreateInfo.pVertexAttributeDescriptions = creator.vertexInputAttributeDescriptions.data(); + vertexInputCreateInfo.vertexBindingDescriptionCount = creator.vertexDescriptor.GetBindings().size(); + vertexInputCreateInfo.pVertexBindingDescriptions = creator.vertexDescriptor.GetBindings().data(); + vertexInputCreateInfo.vertexAttributeDescriptionCount = creator.vertexDescriptor.GetAttributes().size(); + vertexInputCreateInfo.pVertexAttributeDescriptions = creator.vertexDescriptor.GetAttributes().data(); VkPipelineInputAssemblyStateCreateInfo inputAssemblyCreateInfo{}; inputAssemblyCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO; @@ -205,16 +185,9 @@ private: colorBlendCreateInfo.blendConstants[2] = 0.0f; colorBlendCreateInfo.blendConstants[3] = 0.0f; - std::vector layouts{vertexDescriptorSetLayouts.size() + fragmentDescriptorSetLayouts.size()}; - int i = 0; - for (auto&& descriptorSetLayout : vertexDescriptorSetLayouts) - { - layouts[i++] = descriptorSetLayout.second; - } - for (auto&& descriptorSetLayout : fragmentDescriptorSetLayouts) - { - layouts[i++] = descriptorSetLayout.second; - } + std::vector layouts{}; + if (vertexDescriptorSetLayout != VK_NULL_HANDLE) layouts.emplace_back(vertexDescriptorSetLayout); + if (fragmentDescriptorSetLayout != VK_NULL_HANDLE) layouts.emplace_back(fragmentDescriptorSetLayout ); VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo{}; pipelineLayoutCreateInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO; pipelineLayoutCreateInfo.setLayoutCount = layouts.size(); @@ -261,23 +234,37 @@ private: return shaderModule; } - VkDescriptorSetLayout InitializeDescriptorSetLayout(uint32_t binding, VkShaderStageFlags flags) + VkDescriptorSetLayout InitializeDescriptorSetLayouts(const std::set& bindings, VkShaderStageFlags flags) { VkDescriptorSetLayout descriptorSetLayout; - VkDescriptorSetLayoutBinding layoutBinding{}; - layoutBinding.binding = binding; - layoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER; - layoutBinding.descriptorCount = 1; - layoutBinding.stageFlags = flags; - layoutBinding.pImmutableSamplers = nullptr; + std::vector descriptorSetLayoutBindings{bindings.size()}; - VkDescriptorSetLayoutCreateInfo createInfo{}; - createInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO; - createInfo.bindingCount = 1; - createInfo.pBindings = &layoutBinding; + int i = 0; + for (auto&& binding : bindings) + { + VkDescriptorSetLayoutBinding layoutBinding{}; + layoutBinding.binding = binding; + layoutBinding.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER; + layoutBinding.descriptorCount = 1; + layoutBinding.stageFlags = flags; + layoutBinding.pImmutableSamplers = nullptr; + descriptorSetLayoutBindings[i++] = layoutBinding; + } - CP_VK_ASSERT(vkCreateDescriptorSetLayout(instance.GetDevice(), &createInfo, nullptr, &descriptorSetLayout), "Failed to initialize descriptor set layout"); + if (!descriptorSetLayoutBindings.empty()) + { + VkDescriptorSetLayoutCreateInfo createInfo{}; + createInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO; + createInfo.bindingCount = descriptorSetLayoutBindings.size(); + createInfo.pBindings = descriptorSetLayoutBindings.data(); - return descriptorSetLayout; + CP_VK_ASSERT(vkCreateDescriptorSetLayout(instance.GetDevice(), &createInfo, nullptr, &descriptorSetLayout), "Failed to initialize descriptor set layout"); + + return descriptorSetLayout; + } + else + { + return VK_NULL_HANDLE; + } } }; \ No newline at end of file diff --git a/Vulkan/src/PipelineCreator.h b/Vulkan/src/PipelineCreator.h index d037a62..9acfd3f 100644 --- a/Vulkan/src/PipelineCreator.h +++ b/Vulkan/src/PipelineCreator.h @@ -13,8 +13,7 @@ private: std::string vertexShader; std::string fragmentShader; - VkVertexInputBindingDescription vertexInputBindingDescription; - std::vector vertexInputAttributeDescriptions{}; + VertexDescriptor vertexDescriptor{}; VkPrimitiveTopology topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST; VkCullModeFlags cullMode = VK_CULL_MODE_BACK_BIT; VkFrontFace frontFace = VK_FRONT_FACE_CLOCKWISE; @@ -25,18 +24,14 @@ public: : vertexShader{vertexShader}, fragmentShader{fragmentShader} {} - void SetVertexInputBindingDescription(VkVertexInputBindingDescription description) + void SetVertexDescriptor(const VertexDescriptor& descriptor) { - vertexInputBindingDescription = description; - } - - void SetVertexInputAttributeDescription(const std::vector& descriptions) - { - vertexInputAttributeDescriptions = descriptions; + vertexDescriptor = descriptor; } void AddVertexDescriptorSetLayoutBinding(uint32_t binding) { + CP_ASSERT(binding == 0, "Currently only support uniforms with binding = 0"); vertexDescriptorSetLayouts.emplace(binding); } diff --git a/Vulkan/src/SwapChain.cpp b/Vulkan/src/SwapChain.cpp index 44c4631..5f716ee 100644 --- a/Vulkan/src/SwapChain.cpp +++ b/Vulkan/src/SwapChain.cpp @@ -278,6 +278,7 @@ VkSurfaceFormatKHR SwapChain::SelectSwapSurfaceFormat(const std::vector& availablePresentModes) { + return VK_PRESENT_MODE_FIFO_KHR; for (auto&& availablePresentMode : availablePresentModes) { if (availablePresentMode == VK_PRESENT_MODE_MAILBOX_KHR) diff --git a/Vulkan/src/VertexBuffer.h b/Vulkan/src/VertexBuffer.h index 9dd99ec..00530c8 100644 --- a/Vulkan/src/VertexBuffer.h +++ b/Vulkan/src/VertexBuffer.h @@ -6,21 +6,26 @@ class VertexBuffer : public Buffer { CP_DELETE_COPY_AND_MOVE_CTOR(VertexBuffer); - std::map bindingOffsets; - std::map bindingSizes; +private: + std::vector bindingOffsets; + std::vector bindingSizes; public: - VertexBuffer(Instance& instance, VkDeviceSize size) - : Buffer{instance, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, size, 1} - {} - VertexBuffer(Instance& instance, const VertexDescriptor& descriptor, int vertexCount) : Buffer{instance, VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, descriptor.GetVertexSize() * vertexCount, 1} - {} + { + VkDeviceSize offset = 0; + for (auto&& binding : descriptor.GetBindings()) + { + bindingOffsets.emplace_back(offset); + bindingSizes.emplace_back(binding.stride * vertexCount); + offset += binding.stride * vertexCount; + } + } void Bind(VkCommandBuffer commandBuffer) override { - VkDeviceSize offset = 0; - vkCmdBindVertexBuffers(commandBuffer, 0, 1, &handle, &offset); + std::vector buffers{bindingOffsets.size(), handle}; + vkCmdBindVertexBuffers(commandBuffer, 0, bindingOffsets.size(), buffers.data(), bindingOffsets.data()); } void Update(uint32_t binding, void* data) diff --git a/Vulkan/src/VertexDescriptor.h b/Vulkan/src/VertexDescriptor.h index 106b730..79aef91 100644 --- a/Vulkan/src/VertexDescriptor.h +++ b/Vulkan/src/VertexDescriptor.h @@ -14,8 +14,9 @@ public: template void AddAttribute(uint32_t binding, uint32_t location, VkFormat format, uint32_t offset) { - auto it = std::find_if(bindings.begin(), bindings.end(), [&binding](const VkVertexInputBindingDescription& description) { return description.binding == binding; }); - if (it == bindings.end()) + CP_ASSERT(binding <= bindings.size(), "Attribute binding must less than or be equal to the amount of current bindings"); + + if (binding == bindings.size()) AddLayout(binding, sizeof(T)); VkVertexInputAttributeDescription description{}; @@ -36,6 +37,16 @@ public: return bufferSize; } + const std::vector& GetAttributes() const + { + return attributes; + } + + const std::vector& GetBindings() const + { + return bindings; + } + private: uint32_t AddLayout(uint32_t binding, uint32_t size) { diff --git a/Vulkan/src/main.cpp b/Vulkan/src/main.cpp index 95348e0..7cb4061 100644 --- a/Vulkan/src/main.cpp +++ b/Vulkan/src/main.cpp @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -24,15 +25,30 @@ const std::vector vertices = { Vertex{{-0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}} }; +const std::vector positions = { + {-0.5f, -0.5f}, + {0.5f, -0.5f}, + {0.5f, 0.5f}, + {-0.5f, 0.5f} +}; + +const std::vector colors = { + glm::vec3{1.0f, 0.0f, 0.0f}, + glm::vec3{0.0f, 1.0f, 0.0f}, + glm::vec3{0.0f, 0.0f, 1.0f}, + glm::vec3{1.0f, 1.0f, 1.0f} +}; + const std::vector indices = { 0, 1, 2, 2, 3, 0 }; -struct ShaderUniform +struct alignas(64) ShaderUniform { - glm::mat4 model; - glm::mat4 view; - glm::mat4 projection; + alignas(16) glm::mat4 projection; + alignas(16) glm::mat4 view; + alignas(16) glm::mat4 model; + alignas(16) glm::vec3 lightPos; }; class Application final @@ -42,7 +58,7 @@ private: std::unique_ptr graphicsPipeline; std::unique_ptr vertexBuffer; std::unique_ptr indexBuffer; - std::unique_ptr> uniformBuffer; + std::unique_ptr> shaderUniformBuffer; std::vector commandBuffers; public: @@ -86,23 +102,22 @@ private: void InitializeUniformBuffer() { - uniformBuffer = std::make_unique>(*instance, *graphicsPipeline, 0, graphicsPipeline->GetVertexDescriptorSetLayout(0)); + shaderUniformBuffer = std::make_unique>(*instance, *graphicsPipeline, 0, graphicsPipeline->GetVertexDescriptorSetLayout()); } void InitializeGraphicsPipeline() { PipelineCreator creator{"res/shaders/vert.spv", "res/shaders/frag.spv"}; creator.AddVertexDescriptorSetLayoutBinding(0); - creator.SetVertexInputBindingDescription(Vertex::GetBindingDescription()); - creator.SetVertexInputAttributeDescription(Vertex::GetAttributeDescriptions()); + creator.SetVertexDescriptor(Vertex::GetDescriptor()); + creator.SetCullMode(VK_CULL_MODE_NONE); graphicsPipeline = std::make_unique(*instance, creator); } void InitializeVertexBuffer() { - VkDeviceSize bufferSize = sizeof(Vertex) * vertices.size(); - vertexBuffer = std::make_unique(*instance, bufferSize); - vertexBuffer->UpdateStaging((void*)vertices.data()); + vertexBuffer = std::make_unique(*instance, Vertex::GetDescriptor(), vertices.size()); + vertexBuffer->Update(0, (void*)vertices.data()); } void InitializeIndexBuffer() @@ -154,7 +169,7 @@ private: vertexBuffer->Bind(commandBuffer); indexBuffer->Bind(commandBuffer); - uniformBuffer->Bind(commandBuffer); + shaderUniformBuffer->Bind(commandBuffer); indexBuffer->Draw(commandBuffer); @@ -168,12 +183,12 @@ private: float time = startTimer.Elapsed(); ShaderUniform shaderUniform; - shaderUniform.model = glm::rotate(glm::mat4(1.0f), time * glm::radians(90.0f), glm::vec3(0.0f, 0.0f, 1.0f)); - shaderUniform.view = glm::lookAt(glm::vec3(2.0f, 2.0f, 2.0f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f)); + shaderUniform.view = glm::lookAt(glm::vec3(2.0f, 2.0f, 2.0f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f)); shaderUniform.projection = glm::perspective(glm::radians(45.0f), instance->GetSwapChain().GetExtent().width / (float) instance->GetSwapChain().GetExtent().height, 0.1f, 10.0f); + shaderUniform.model = glm::rotate(glm::mat4(1.0f), time * glm::radians(90.0f), glm::vec3(0.0f, 1.0f, 0.0f)); shaderUniform.projection[1][1] *= -1; - uniformBuffer->Update(shaderUniform); + shaderUniformBuffer->Update(shaderUniform); } VkShaderModule InitializeShaderModule(const std::vector& code)