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Fri, 14 Jan 2022 11:29:58 +0100 To: Jules Maselbas , barebox@lists.infradead.org References: <20220110221255.5003-1-jmaselbas@kalray.eu> <20220110221255.5003-4-jmaselbas@kalray.eu> From: Ahmad Fatoum Message-ID: Date: Fri, 14 Jan 2022 11:29:58 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20220110221255.5003-4-jmaselbas@kalray.eu> Content-Language: en-US X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:e::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.9 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH 3/5] scripts: Add qoiconv to convert png to qoi X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) On 10.01.22 23:12, Jules Maselbas wrote: > ImageMagick will eventually support the qoi image format, in the > mean time add a png to qoi conversion program. > > Signed-off-by: Jules Maselbas > --- > scripts/Kconfig | 5 + > scripts/Makefile | 1 + > scripts/qoiconv.c | 91 + > scripts/stb_image.h | 7756 +++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 7853 insertions(+) > create mode 100644 scripts/qoiconv.c > create mode 100644 scripts/stb_image.h > > diff --git a/scripts/Kconfig b/scripts/Kconfig > index 9b744deba9..747f665e02 100644 > --- a/scripts/Kconfig > +++ b/scripts/Kconfig > @@ -110,6 +110,11 @@ config RK_USB_LOADER > > You need libusb-1.0 to compile this tool. > > +config QOICONV > + bool "QOI image format conversion" if COMPILE_HOST_TOOLS > + help > + This enable converting png to qoi images to generate boot logo. > + > endmenu > > menu "Target Tools" > diff --git a/scripts/Makefile b/scripts/Makefile > index dc5fa75f90..cbaf2d55ff 100644 > --- a/scripts/Makefile > +++ b/scripts/Makefile > @@ -8,6 +8,7 @@ hostprogs-always-y += fix_size > hostprogs-always-y += bareboxenv > hostprogs-always-y += bareboxcrc32 > hostprogs-always-y += kernel-install > +hostprogs-always-$(CONFIG_QOICONV) += qoiconv > hostprogs-always-$(CONFIG_CRYPTO_RSA_BUILTIN_KEYS) += rsatoc > HOSTCFLAGS_rsatoc = `pkg-config --cflags openssl` > HOSTLDLIBS_rsatoc = `pkg-config --libs openssl` > diff --git a/scripts/qoiconv.c b/scripts/qoiconv.c > new file mode 100644 > index 0000000000..010c70ead0 > --- /dev/null > +++ b/scripts/qoiconv.c > @@ -0,0 +1,91 @@ > +/* > + > +Command line tool to convert between png <> qoi format > + > +Requires "stb_image.h" and "stb_image_write.h" > +Compile with: > + gcc qoiconv.c -std=c99 -O3 -o qoiconv > + > +Dominic Szablewski - https://phoboslab.org > + > + > +-- LICENSE: The MIT License(MIT) > + > +Copyright(c) 2021 Dominic Szablewski > + > +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. > + > +*/ Can you not reuse the header added in the previous commit? > + > + > +#define STB_IMAGE_IMPLEMENTATION > +#define STBI_ONLY_PNG > +#define STBI_NO_LINEAR > +#include "stb_image.h" > + > +#define QOI_IMPLEMENTATION > +#include "../lib/gui/qoi.h" > + > +#define STR_ENDS_WITH(S, E) (strcmp(S + strlen(S) - (sizeof(E)-1), E) == 0) > + > +int main(int argc, char **argv) { > + if (argc < 3) { > + puts("Usage: qoiconv "); > + puts("Examples:"); > + puts(" qoiconv input.png output.qoi"); > + puts(" qoiconv input.qoi output.png"); > + exit(1); > + } > + > + void *pixels = NULL; > + int w, h, channels; > + if (STR_ENDS_WITH(argv[1], ".png")) { > + if(!stbi_info(argv[1], &w, &h, &channels)) { > + printf("Couldn't read header %s\n", argv[1]); > + exit(1); > + } > + > + // Force all odd encodings to be RGBA > + if(channels != 3) { > + channels = 4; > + } > + > + pixels = (void *)stbi_load(argv[1], &w, &h, NULL, channels); > + } > + if (pixels == NULL) { > + printf("Couldn't load/decode %s\n", argv[1]); > + exit(1); > + } > + > + int encoded = 0; > + if (STR_ENDS_WITH(argv[2], ".qoi")) { > + encoded = qoi_write(argv[2], pixels, &(qoi_desc){ > + .width = w, > + .height = h, > + .channels = channels, > + .colorspace = QOI_SRGB > + }); > + } > + > + if (!encoded) { > + printf("Couldn't write/encode %s\n", argv[2]); > + exit(1); > + } > + > + free(pixels); > + return 0; > +} > diff --git a/scripts/stb_image.h b/scripts/stb_image.h > new file mode 100644 > index 0000000000..742fac74f7 > --- /dev/null > +++ b/scripts/stb_image.h > @@ -0,0 +1,7756 @@ > +/* stb_image - v2.26 - 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: > + > + 2.26 (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 > + 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 > + 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 [reserved] > + Luca Sas Alexander Veselov Zack Middleton [reserved] > + Ryan C. Gordon [reserved] [reserved] > + DO NOT ADD YOUR NAME HERE > + > + 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. > +// > +// =========================================================================== > +// > +// UNICODE: > +// > +// If compiling for Windows and you wish to use Unicode filenames, compile > +// with > +// #define STBI_WINDOWS_UTF8 > +// and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert > +// Windows wchar_t filenames to utf8. > +// > +// =========================================================================== > +// > +// Philosophy > +// > +// stb libraries are designed with the following priorities: > +// > +// 1. easy to use > +// 2. easy to maintain > +// 3. good performance > +// > +// Sometimes I let "good performance" creep up in priority over "easy to maintain", > +// and for best performance I may provide less-easy-to-use APIs that give higher > +// performance, in addition to the easy-to-use ones. Nevertheless, it's important > +// to keep in mind that from the standpoint of you, a client of this library, > +// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all. > +// > +// Some secondary priorities arise directly from the first two, some of which > +// provide more explicit reasons why performance can't be emphasized. > +// > +// - Portable ("ease of use") > +// - Small source code footprint ("easy to maintain") > +// - No dependencies ("ease of use") > +// > +// =========================================================================== > +// > +// I/O callbacks > +// > +// I/O callbacks allow you to read from arbitrary sources, like packaged > +// files or some other source. Data read from callbacks are processed > +// through a small internal buffer (currently 128 bytes) to try to reduce > +// overhead. > +// > +// The three functions you must define are "read" (reads some bytes of data), > +// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end). > +// > +// =========================================================================== > +// > +// SIMD support > +// > +// The JPEG decoder will try to automatically use SIMD kernels on x86 when > +// supported by the compiler. For ARM Neon support, you must explicitly > +// request it. > +// > +// (The old do-it-yourself SIMD API is no longer supported in the current > +// code.) > +// > +// On x86, SSE2 will automatically be used when available based on a run-time > +// test; if not, the generic C versions are used as a fall-back. On ARM targets, > +// the typical path is to have separate builds for NEON and non-NEON devices > +// (at least this is true for iOS and Android). Therefore, the NEON support is > +// toggled by a build flag: define STBI_NEON to get NEON loops. > +// > +// If for some reason you do not want to use any of SIMD code, or if > +// you have issues compiling it, you can disable it entirely by > +// defining STBI_NO_SIMD. > +// > +// =========================================================================== > +// > +// HDR image support (disable by defining STBI_NO_HDR) > +// > +// stb_image supports loading HDR images in general, and currently the Radiance > +// .HDR file format specifically. You can still load any file through the existing > +// interface; if you attempt to load an HDR file, it will be automatically remapped > +// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; > +// both of these constants can be reconfigured through this interface: > +// > +// stbi_hdr_to_ldr_gamma(2.2f); > +// stbi_hdr_to_ldr_scale(1.0f); > +// > +// (note, do not use _inverse_ constants; stbi_image will invert them > +// appropriately). > +// > +// Additionally, there is a new, parallel interface for loading files as > +// (linear) floats to preserve the full dynamic range: > +// > +// float *data = stbi_loadf(filename, &x, &y, &n, 0); > +// > +// If you load LDR images through this interface, those images will > +// be promoted to floating point values, run through the inverse of > +// constants corresponding to the above: > +// > +// stbi_ldr_to_hdr_scale(1.0f); > +// stbi_ldr_to_hdr_gamma(2.2f); > +// > +// Finally, given a filename (or an open file or memory block--see header > +// file for details) containing image data, you can query for the "most > +// appropriate" interface to use (that is, whether the image is HDR or > +// not), using: > +// > +// stbi_is_hdr(char *filename); > +// > +// =========================================================================== > +// > +// iPhone PNG support: > +// > +// By default we convert iphone-formatted PNGs back to RGB, even though > +// they are internally encoded differently. You can disable this conversion > +// by calling stbi_convert_iphone_png_to_rgb(0), in which case > +// you will always just get the native iphone "format" through (which > +// is BGR stored in RGB). > +// > +// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per > +// pixel to remove any premultiplied alpha *only* if the image file explicitly > +// says there's premultiplied data (currently only happens in iPhone images, > +// and only if iPhone convert-to-rgb processing is on). > +// > +// =========================================================================== > +// > +// ADDITIONAL CONFIGURATION > +// > +// - You can suppress implementation of any of the decoders to reduce > +// your code footprint by #defining one or more of the following > +// symbols before creating the implementation. > +// > +// STBI_NO_JPEG > +// STBI_NO_PNG > +// STBI_NO_BMP > +// STBI_NO_PSD > +// STBI_NO_TGA > +// STBI_NO_GIF > +// STBI_NO_HDR > +// STBI_NO_PIC > +// STBI_NO_PNM (.ppm and .pgm) > +// > +// - You can request *only* certain decoders and suppress all other ones > +// (this will be more forward-compatible, as addition of new decoders > +// doesn't require you to disable them explicitly): > +// > +// STBI_ONLY_JPEG > +// STBI_ONLY_PNG > +// STBI_ONLY_BMP > +// STBI_ONLY_PSD > +// STBI_ONLY_TGA > +// STBI_ONLY_GIF > +// STBI_ONLY_HDR > +// STBI_ONLY_PIC > +// STBI_ONLY_PNM (.ppm and .pgm) > +// > +// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still > +// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB > +// > +// - 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_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) >> (32 - (y)))) > +#endif > + > +#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED)) > +// ok > +#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED) > +// ok > +#else > +#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)." > +#endif > + > +#ifndef STBI_MALLOC > +#define STBI_MALLOC(sz) malloc(sz) > +#define STBI_REALLOC(p,newsz) realloc(p,newsz) > +#define STBI_FREE(p) free(p) > +#endif > + > +#ifndef STBI_REALLOC_SIZED > +#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz) > +#endif > + > +// x86/x64 detection > +#if defined(__x86_64__) || defined(_M_X64) > +#define STBI__X64_TARGET > +#elif defined(__i386) || defined(_M_IX86) > +#define STBI__X86_TARGET > +#endif > + > +#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) > +// gcc doesn't support sse2 intrinsics unless you compile with -msse2, > +// which in turn means it gets to use SSE2 everywhere. This is unfortunate, > +// but previous attempts to provide the SSE2 functions with runtime > +// detection caused numerous issues. The way architecture extensions are > +// exposed in GCC/Clang is, sadly, not really suited for one-file libs. > +// New behavior: if compiled with -msse2, we use SSE2 without any > +// detection; if not, we don't use it at all. > +#define STBI_NO_SIMD > +#endif > + > +#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD) > +// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET > +// > +// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the > +// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant. > +// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not > +// simultaneously enabling "-mstackrealign". > +// > +// See https://github.com/nothings/stb/issues/81 for more information. > +// > +// So default to no SSE2 on 32-bit MinGW. If you've read this far and added > +// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2. > +#define STBI_NO_SIMD > +#endif > + > +#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) > +#define STBI_SSE2 > +#include > + > +#ifdef _MSC_VER > + > +#if _MSC_VER >= 1400 // not VC6 > +#include // __cpuid > +static int stbi__cpuid3(void) > +{ > + int info[4]; > + __cpuid(info,1); > + return info[3]; > +} > +#else > +static int stbi__cpuid3(void) > +{ > + int res; > + __asm { > + mov eax,1 > + cpuid > + mov res,edx > + } > + return res; > +} > +#endif > + > +#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name > + > +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) > +static int stbi__sse2_available(void) > +{ > + int info3 = stbi__cpuid3(); > + return ((info3 >> 26) & 1) != 0; > +} > +#endif > + > +#else // assume GCC-style if not VC++ > +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) > + > +#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2) > +static int stbi__sse2_available(void) > +{ > + // If we're even attempting to compile this on GCC/Clang, that means > + // -msse2 is on, which means the compiler is allowed to use SSE2 > + // instructions at will, and so are we. > + return 1; > +} > +#endif > + > +#endif > +#endif > + > +// ARM NEON > +#if defined(STBI_NO_SIMD) && defined(STBI_NEON) > +#undef STBI_NEON > +#endif > + > +#ifdef STBI_NEON > +#include > +// assume GCC or Clang on ARM targets > +#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16))) > +#endif > + > +#ifndef STBI_SIMD_ALIGN > +#define STBI_SIMD_ALIGN(type, name) type name > +#endif > + > +#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); > +#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) > +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) > +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; > + > + #ifndef STBI_NO_JPEG > + if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri); > + #endif > + #ifndef STBI_NO_PNG > + if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri); > + #endif > + #ifndef STBI_NO_BMP > + if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri); > + #endif > + #ifndef STBI_NO_GIF > + if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri); > + #endif > + #ifndef STBI_NO_PSD > + if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc); > + #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 > + #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(_MSC_VER) && defined(STBI_WINDOWS_UTF8) > +STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); > +STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default); > +#endif > + > +#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) > +STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) > +{ > + return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); > +} > +#endif > + > +static FILE *stbi__fopen(char const *filename, char const *mode) > +{ > + FILE *f; > +#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) > + wchar_t wMode[64]; > + wchar_t wFilename[1024]; > + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename))) > + return 0; > + > + if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode))) > + return 0; > + > +#if _MSC_VER >= 1400 > + if (0 != _wfopen_s(&f, wFilename, wMode)) > + f = 0; > +#else > + f = _wfopen(wFilename, wMode); > +#endif > + > +#elif defined(_MSC_VER) && _MSC_VER >= 1400 > + if (0 != fopen_s(&f, filename, mode)) > + f=0; > +#else > + f = fopen(filename, mode); > +#endif > + return f; > +} > + > + > +STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) > +{ > + FILE *f = stbi__fopen(filename, "rb"); > + unsigned char *result; > + if (!f) return stbi__errpuc("can't fopen", "Unable to open file"); > + result = stbi_load_from_file(f,x,y,comp,req_comp); > + fclose(f); > + return result; > +} > + > +STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) > +{ > + unsigned char *result; > + stbi__context s; > + stbi__start_file(&s,f); > + result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); > + if (result) { > + // need to 'unget' all the characters in the IO buffer > + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); > + } > + return result; > +} > + > +STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp) > +{ > + stbi__uint16 *result; > + stbi__context s; > + stbi__start_file(&s,f); > + result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp); > + if (result) { > + // need to 'unget' all the characters in the IO buffer > + fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR); > + } > + return result; > +} > + > +STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp) > +{ > + FILE *f = stbi__fopen(filename, "rb"); > + stbi__uint16 *result; > + if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file"); > + result = stbi_load_from_file_16(f,x,y,comp,req_comp); > + fclose(f); > + return result; > +} > + > + > +#endif //!STBI_NO_STDIO > + > +STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels) > +{ > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); > +} > + > +STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels) > +{ > + stbi__context s; > + stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user); > + return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels); > +} > + > +STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) > +{ > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); > +} > + > +STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) > +{ > + stbi__context s; > + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); > + return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp); > +} > + > +#ifndef STBI_NO_GIF > +STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp) > +{ > + unsigned char *result; > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + > + result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp); > + if (stbi__vertically_flip_on_load) { > + stbi__vertical_flip_slices( result, *x, *y, *z, *comp ); > + } > + > + return result; > +} > +#endif > + > +#ifndef STBI_NO_LINEAR > +static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp) > +{ > + unsigned char *data; > + #ifndef STBI_NO_HDR > + if (stbi__hdr_test(s)) { > + stbi__result_info ri; > + float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri); > + if (hdr_data) > + stbi__float_postprocess(hdr_data,x,y,comp,req_comp); > + return hdr_data; > + } > + #endif > + data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp); > + if (data) > + return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); > + return stbi__errpf("unknown image type", "Image not of any known type, or corrupt"); > +} > + > +STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) > +{ > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + return stbi__loadf_main(&s,x,y,comp,req_comp); > +} > + > +STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp) > +{ > + stbi__context s; > + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); > + return stbi__loadf_main(&s,x,y,comp,req_comp); > +} > + > +#ifndef STBI_NO_STDIO > +STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) > +{ > + float *result; > + FILE *f = stbi__fopen(filename, "rb"); > + if (!f) return stbi__errpf("can't fopen", "Unable to open file"); > + result = stbi_loadf_from_file(f,x,y,comp,req_comp); > + fclose(f); > + return result; > +} > + > +STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) > +{ > + stbi__context s; > + stbi__start_file(&s,f); > + return stbi__loadf_main(&s,x,y,comp,req_comp); > +} > +#endif // !STBI_NO_STDIO > + > +#endif // !STBI_NO_LINEAR > + > +// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is > +// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always > +// reports false! > + > +STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) > +{ > + #ifndef STBI_NO_HDR > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + return stbi__hdr_test(&s); > + #else > + STBI_NOTUSED(buffer); > + STBI_NOTUSED(len); > + return 0; > + #endif > +} > + > +#ifndef STBI_NO_STDIO > +STBIDEF int stbi_is_hdr (char const *filename) > +{ > + FILE *f = stbi__fopen(filename, "rb"); > + int result=0; > + if (f) { > + result = stbi_is_hdr_from_file(f); > + fclose(f); > + } > + return result; > +} > + > +STBIDEF int stbi_is_hdr_from_file(FILE *f) > +{ > + #ifndef STBI_NO_HDR > + long pos = ftell(f); > + int res; > + stbi__context s; > + stbi__start_file(&s,f); > + res = stbi__hdr_test(&s); > + fseek(f, pos, SEEK_SET); > + return res; > + #else > + STBI_NOTUSED(f); > + return 0; > + #endif > +} > +#endif // !STBI_NO_STDIO > + > +STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user) > +{ > + #ifndef STBI_NO_HDR > + stbi__context s; > + stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user); > + return stbi__hdr_test(&s); > + #else > + STBI_NOTUSED(clbk); > + STBI_NOTUSED(user); > + return 0; > + #endif > +} > + > +#ifndef STBI_NO_LINEAR > +static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f; > + > +STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; } > +STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; } > +#endif > + > +static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f; > + > +STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; } > +STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; } > + > + > +////////////////////////////////////////////////////////////////////////////// > +// > +// Common code used by all image loaders > +// > + > +enum > +{ > + STBI__SCAN_load=0, > + STBI__SCAN_type, > + STBI__SCAN_header > +}; > + > +static void stbi__refill_buffer(stbi__context *s) > +{ > + int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen); > + 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); > + return z + (stbi__get16le(s) << 16); > +} > +#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< +static const int stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767}; > + > +// combined JPEG 'receive' and JPEG 'extend', since baseline > +// always extends everything it receives. > +stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n) > +{ > + unsigned int k; > + int sgn; > + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); > + > + sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB > + k = stbi_lrot(j->code_buffer, n); > + if (n < 0 || n >= (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask))) return 0; > + j->code_buffer = k & ~stbi__bmask[n]; > + k &= stbi__bmask[n]; > + j->code_bits -= n; > + return k + (stbi__jbias[n] & ~sgn); > +} > + > +// get some unsigned bits > +stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n) > +{ > + unsigned int k; > + if (j->code_bits < n) stbi__grow_buffer_unsafe(j); > + k = stbi_lrot(j->code_buffer, n); > + j->code_buffer = k & ~stbi__bmask[n]; > + k &= stbi__bmask[n]; > + j->code_bits -= n; > + return k; > +} > + > +stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j) > +{ > + unsigned int k; > + if (j->code_bits < 1) stbi__grow_buffer_unsafe(j); > + k = j->code_buffer; > + j->code_buffer <<= 1; > + --j->code_bits; > + return k & 0x80000000; > +} > + > +// given a value that's at position X in the zigzag stream, > +// where does it appear in the 8x8 matrix coded as row-major? > +static const stbi_uc stbi__jpeg_dezigzag[64+15] = > +{ > + 0, 1, 8, 16, 9, 2, 3, 10, > + 17, 24, 32, 25, 18, 11, 4, 5, > + 12, 19, 26, 33, 40, 48, 41, 34, > + 27, 20, 13, 6, 7, 14, 21, 28, > + 35, 42, 49, 56, 57, 50, 43, 36, > + 29, 22, 15, 23, 30, 37, 44, 51, > + 58, 59, 52, 45, 38, 31, 39, 46, > + 53, 60, 61, 54, 47, 55, 62, 63, > + // let corrupt input sample past end > + 63, 63, 63, 63, 63, 63, 63, 63, > + 63, 63, 63, 63, 63, 63, 63 > +}; > + > +// decode one 64-entry block-- > +static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant) > +{ > + int diff,dc,k; > + int t; > + > + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); > + t = stbi__jpeg_huff_decode(j, hdc); > + if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG"); > + > + // 0 all the ac values now so we can do it 32-bits at a time > + memset(data,0,64*sizeof(data[0])); > + > + diff = t ? stbi__extend_receive(j, t) : 0; > + dc = j->img_comp[b].dc_pred + diff; > + j->img_comp[b].dc_pred = dc; > + data[0] = (short) (dc * dequant[0]); > + > + // decode AC components, see JPEG spec > + k = 1; > + do { > + unsigned int zig; > + int c,r,s; > + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); > + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); > + r = fac[c]; > + if (r) { // fast-AC path > + k += (r >> 4) & 15; // run > + s = r & 15; // combined length > + j->code_buffer <<= s; > + j->code_bits -= s; > + // decode into unzigzag'd location > + zig = stbi__jpeg_dezigzag[k++]; > + data[zig] = (short) ((r >> 8) * dequant[zig]); > + } else { > + int rs = stbi__jpeg_huff_decode(j, hac); > + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); > + s = rs & 15; > + r = rs >> 4; > + if (s == 0) { > + if (rs != 0xf0) break; // end block > + k += 16; > + } else { > + k += r; > + // decode into unzigzag'd location > + zig = stbi__jpeg_dezigzag[k++]; > + data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]); > + } > + } > + } while (k < 64); > + return 1; > +} > + > +static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b) > +{ > + int diff,dc; > + int t; > + if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); > + > + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); > + > + if (j->succ_high == 0) { > + // first scan for DC coefficient, must be first > + memset(data,0,64*sizeof(data[0])); // 0 all the ac values now > + t = stbi__jpeg_huff_decode(j, hdc); > + if (t == -1) 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 << j->succ_low); > + } else { > + // refinement scan for DC coefficient > + if (stbi__jpeg_get_bit(j)) > + data[0] += (short) (1 << j->succ_low); > + } > + return 1; > +} > + > +// @OPTIMIZE: store non-zigzagged during the decode passes, > +// and only de-zigzag when dequantizing > +static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac) > +{ > + int k; > + if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG"); > + > + if (j->succ_high == 0) { > + int shift = j->succ_low; > + > + if (j->eob_run) { > + --j->eob_run; > + return 1; > + } > + > + k = j->spec_start; > + do { > + unsigned int zig; > + int c,r,s; > + if (j->code_bits < 16) stbi__grow_buffer_unsafe(j); > + c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); > + r = fac[c]; > + if (r) { // fast-AC path > + k += (r >> 4) & 15; // run > + s = r & 15; // combined length > + j->code_buffer <<= s; > + j->code_bits -= s; > + zig = stbi__jpeg_dezigzag[k++]; > + data[zig] = (short) ((r >> 8) << shift); > + } else { > + int rs = stbi__jpeg_huff_decode(j, hac); > + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); > + s = rs & 15; > + r = rs >> 4; > + if (s == 0) { > + if (r < 15) { > + j->eob_run = (1 << r); > + if (r) > + j->eob_run += stbi__jpeg_get_bits(j, r); > + --j->eob_run; > + break; > + } > + k += 16; > + } else { > + k += r; > + zig = stbi__jpeg_dezigzag[k++]; > + data[zig] = (short) (stbi__extend_receive(j,s) << shift); > + } > + } > + } while (k <= j->spec_end); > + } else { > + // refinement scan for these AC coefficients > + > + short bit = (short) (1 << j->succ_low); > + > + if (j->eob_run) { > + --j->eob_run; > + for (k = j->spec_start; k <= j->spec_end; ++k) { > + short *p = &data[stbi__jpeg_dezigzag[k]]; > + if (*p != 0) > + if (stbi__jpeg_get_bit(j)) > + if ((*p & bit)==0) { > + if (*p > 0) > + *p += bit; > + else > + *p -= bit; > + } > + } > + } else { > + k = j->spec_start; > + do { > + int r,s; > + int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh > + if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG"); > + s = rs & 15; > + r = rs >> 4; > + if (s == 0) { > + if (r < 15) { > + j->eob_run = (1 << r) - 1; > + if (r) > + j->eob_run += stbi__jpeg_get_bits(j, r); > + r = 64; // force end of block > + } else { > + // r=15 s=0 should write 16 0s, so we just do > + // a run of 15 0s and then write s (which is 0), > + // so we don't have to do anything special here > + } > + } else { > + if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG"); > + // sign bit > + if (stbi__jpeg_get_bit(j)) > + s = bit; > + else > + s = -bit; > + } > + > + // advance by r > + while (k <= j->spec_end) { > + short *p = &data[stbi__jpeg_dezigzag[k++]]; > + if (*p != 0) { > + if (stbi__jpeg_get_bit(j)) > + if ((*p & bit)==0) { > + if (*p > 0) > + *p += bit; > + else > + *p -= bit; > + } > + } else { > + if (r == 0) { > + *p = (short) s; > + break; > + } > + --r; > + } > + } > + } while (k <= j->spec_end); > + } > + } > + return 1; > +} > + > +// take a -128..127 value and stbi__clamp it and convert to 0..255 > +stbi_inline static stbi_uc stbi__clamp(int x) > +{ > + // trick to use a single test to catch both cases > + if ((unsigned int) x > 255) { > + if (x < 0) return 0; > + if (x > 255) return 255; > + } > + return (stbi_uc) x; > +} > + > +#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5))) > +#define stbi__fsh(x) ((x) * 4096) > + > +// derived from jidctint -- DCT_ISLOW > +#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ > + int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ > + p2 = s2; \ > + p3 = s6; \ > + p1 = (p2+p3) * stbi__f2f(0.5411961f); \ > + t2 = p1 + p3*stbi__f2f(-1.847759065f); \ > + t3 = p1 + p2*stbi__f2f( 0.765366865f); \ > + p2 = s0; \ > + p3 = s4; \ > + t0 = stbi__fsh(p2+p3); \ > + t1 = stbi__fsh(p2-p3); \ > + x0 = t0+t3; \ > + x3 = t0-t3; \ > + x1 = t1+t2; \ > + x2 = t1-t2; \ > + t0 = s7; \ > + t1 = s5; \ > + t2 = s3; \ > + t3 = s1; \ > + p3 = t0+t2; \ > + p4 = t1+t3; \ > + p1 = t0+t3; \ > + p2 = t1+t2; \ > + p5 = (p3+p4)*stbi__f2f( 1.175875602f); \ > + t0 = t0*stbi__f2f( 0.298631336f); \ > + t1 = t1*stbi__f2f( 2.053119869f); \ > + t2 = t2*stbi__f2f( 3.072711026f); \ > + t3 = t3*stbi__f2f( 1.501321110f); \ > + p1 = p5 + p1*stbi__f2f(-0.899976223f); \ > + p2 = p5 + p2*stbi__f2f(-2.562915447f); \ > + p3 = p3*stbi__f2f(-1.961570560f); \ > + p4 = p4*stbi__f2f(-0.390180644f); \ > + t3 += p1+p4; \ > + t2 += p2+p3; \ > + t1 += p2+p4; \ > + t0 += p1+p3; > + > +static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64]) > +{ > + int i,val[64],*v=val; > + stbi_uc *o; > + short *d = data; > + > + // columns > + for (i=0; i < 8; ++i,++d, ++v) { > + // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing > + if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 > + && d[40]==0 && d[48]==0 && d[56]==0) { > + // no shortcut 0 seconds > + // (1|2|3|4|5|6|7)==0 0 seconds > + // all separate -0.047 seconds > + // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds > + int dcterm = d[0]*4; > + v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; > + } else { > + STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56]) > + // constants scaled things up by 1<<12; let's bring them back > + // down, but keep 2 extra bits of precision > + x0 += 512; x1 += 512; x2 += 512; x3 += 512; > + v[ 0] = (x0+t3) >> 10; > + v[56] = (x0-t3) >> 10; > + v[ 8] = (x1+t2) >> 10; > + v[48] = (x1-t2) >> 10; > + v[16] = (x2+t1) >> 10; > + v[40] = (x2-t1) >> 10; > + v[24] = (x3+t0) >> 10; > + v[32] = (x3-t0) >> 10; > + } > + } > + > + for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { > + // no fast case since the first 1D IDCT spread components out > + STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) > + // constants scaled things up by 1<<12, plus we had 1<<2 from first > + // loop, plus horizontal and vertical each scale by sqrt(8) so together > + // we've got an extra 1<<3, so 1<<17 total we need to remove. > + // so we want to round that, which means adding 0.5 * 1<<17, > + // aka 65536. Also, we'll end up with -128 to 127 that we want > + // to encode as 0..255 by adding 128, so we'll add that before the shift > + x0 += 65536 + (128<<17); > + x1 += 65536 + (128<<17); > + x2 += 65536 + (128<<17); > + x3 += 65536 + (128<<17); > + // tried computing the shifts into temps, or'ing the temps to see > + // if any were out of range, but that was slower > + o[0] = stbi__clamp((x0+t3) >> 17); > + o[7] = stbi__clamp((x0-t3) >> 17); > + o[1] = stbi__clamp((x1+t2) >> 17); > + o[6] = stbi__clamp((x1-t2) >> 17); > + o[2] = stbi__clamp((x2+t1) >> 17); > + o[5] = stbi__clamp((x2-t1) >> 17); > + o[3] = stbi__clamp((x3+t0) >> 17); > + o[4] = stbi__clamp((x3-t0) >> 17); > + } > +} > + > +#ifdef STBI_SSE2 > +// sse2 integer IDCT. not the fastest possible implementation but it > +// produces bit-identical results to the generic C version so it's > +// fully "transparent". > +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) > +{ > + // This is constructed to match our regular (generic) integer IDCT exactly. > + __m128i row0, row1, row2, row3, row4, row5, row6, row7; > + __m128i tmp; > + > + // dot product constant: even elems=x, odd elems=y > + #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y)) > + > + // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit) > + // out(1) = c1[even]*x + c1[odd]*y > + #define dct_rot(out0,out1, x,y,c0,c1) \ > + __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \ > + __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \ > + __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \ > + __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \ > + __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \ > + __m128i out1##_h = _mm_madd_epi16(c0##hi, c1) > + > + // out = in << 12 (in 16-bit, out 32-bit) > + #define dct_widen(out, in) \ > + __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \ > + __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4) > + > + // wide add > + #define dct_wadd(out, a, b) \ > + __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \ > + __m128i out##_h = _mm_add_epi32(a##_h, b##_h) > + > + // wide sub > + #define dct_wsub(out, a, b) \ > + __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \ > + __m128i out##_h = _mm_sub_epi32(a##_h, b##_h) > + > + // butterfly a/b, add bias, then shift by "s" and pack > + #define dct_bfly32o(out0, out1, a,b,bias,s) \ > + { \ > + __m128i abiased_l = _mm_add_epi32(a##_l, bias); \ > + __m128i abiased_h = _mm_add_epi32(a##_h, bias); \ > + dct_wadd(sum, abiased, b); \ > + dct_wsub(dif, abiased, b); \ > + out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \ > + out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \ > + } > + > + // 8-bit interleave step (for transposes) > + #define dct_interleave8(a, b) \ > + tmp = a; \ > + a = _mm_unpacklo_epi8(a, b); \ > + b = _mm_unpackhi_epi8(tmp, b) > + > + // 16-bit interleave step (for transposes) > + #define dct_interleave16(a, b) \ > + tmp = a; \ > + a = _mm_unpacklo_epi16(a, b); \ > + b = _mm_unpackhi_epi16(tmp, b) > + > + #define dct_pass(bias,shift) \ > + { \ > + /* even part */ \ > + dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \ > + __m128i sum04 = _mm_add_epi16(row0, row4); \ > + __m128i dif04 = _mm_sub_epi16(row0, row4); \ > + dct_widen(t0e, sum04); \ > + dct_widen(t1e, dif04); \ > + dct_wadd(x0, t0e, t3e); \ > + dct_wsub(x3, t0e, t3e); \ > + dct_wadd(x1, t1e, t2e); \ > + dct_wsub(x2, t1e, t2e); \ > + /* odd part */ \ > + dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \ > + dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \ > + __m128i sum17 = _mm_add_epi16(row1, row7); \ > + __m128i sum35 = _mm_add_epi16(row3, row5); \ > + dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \ > + dct_wadd(x4, y0o, y4o); \ > + dct_wadd(x5, y1o, y5o); \ > + dct_wadd(x6, y2o, y5o); \ > + dct_wadd(x7, y3o, y4o); \ > + dct_bfly32o(row0,row7, x0,x7,bias,shift); \ > + dct_bfly32o(row1,row6, x1,x6,bias,shift); \ > + dct_bfly32o(row2,row5, x2,x5,bias,shift); \ > + dct_bfly32o(row3,row4, x3,x4,bias,shift); \ > + } > + > + __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f)); > + __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f)); > + __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f)); > + __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f)); > + __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f)); > + __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f)); > + __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f)); > + __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f)); > + > + // rounding biases in column/row passes, see stbi__idct_block for explanation. > + __m128i bias_0 = _mm_set1_epi32(512); > + __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17)); > + > + // load > + row0 = _mm_load_si128((const __m128i *) (data + 0*8)); > + row1 = _mm_load_si128((const __m128i *) (data + 1*8)); > + row2 = _mm_load_si128((const __m128i *) (data + 2*8)); > + row3 = _mm_load_si128((const __m128i *) (data + 3*8)); > + row4 = _mm_load_si128((const __m128i *) (data + 4*8)); > + row5 = _mm_load_si128((const __m128i *) (data + 5*8)); > + row6 = _mm_load_si128((const __m128i *) (data + 6*8)); > + row7 = _mm_load_si128((const __m128i *) (data + 7*8)); > + > + // column pass > + dct_pass(bias_0, 10); > + > + { > + // 16bit 8x8 transpose pass 1 > + dct_interleave16(row0, row4); > + dct_interleave16(row1, row5); > + dct_interleave16(row2, row6); > + dct_interleave16(row3, row7); > + > + // transpose pass 2 > + dct_interleave16(row0, row2); > + dct_interleave16(row1, row3); > + dct_interleave16(row4, row6); > + dct_interleave16(row5, row7); > + > + // transpose pass 3 > + dct_interleave16(row0, row1); > + dct_interleave16(row2, row3); > + dct_interleave16(row4, row5); > + dct_interleave16(row6, row7); > + } > + > + // row pass > + dct_pass(bias_1, 17); > + > + { > + // pack > + __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7 > + __m128i p1 = _mm_packus_epi16(row2, row3); > + __m128i p2 = _mm_packus_epi16(row4, row5); > + __m128i p3 = _mm_packus_epi16(row6, row7); > + > + // 8bit 8x8 transpose pass 1 > + dct_interleave8(p0, p2); // a0e0a1e1... > + dct_interleave8(p1, p3); // c0g0c1g1... > + > + // transpose pass 2 > + dct_interleave8(p0, p1); // a0c0e0g0... > + dct_interleave8(p2, p3); // b0d0f0h0... > + > + // transpose pass 3 > + dct_interleave8(p0, p2); // a0b0c0d0... > + dct_interleave8(p1, p3); // a4b4c4d4... > + > + // store > + _mm_storel_epi64((__m128i *) out, p0); out += out_stride; > + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride; > + _mm_storel_epi64((__m128i *) out, p2); out += out_stride; > + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride; > + _mm_storel_epi64((__m128i *) out, p1); out += out_stride; > + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride; > + _mm_storel_epi64((__m128i *) out, p3); out += out_stride; > + _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e)); > + } > + > +#undef dct_const > +#undef dct_rot > +#undef dct_widen > +#undef dct_wadd > +#undef dct_wsub > +#undef dct_bfly32o > +#undef dct_interleave8 > +#undef dct_interleave16 > +#undef dct_pass > +} > + > +#endif // STBI_SSE2 > + > +#ifdef STBI_NEON > + > +// NEON integer IDCT. should produce bit-identical > +// results to the generic C version. > +static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64]) > +{ > + int16x8_t row0, row1, row2, row3, row4, row5, row6, row7; > + > + int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f)); > + int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f)); > + int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f)); > + int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f)); > + int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f)); > + int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f)); > + int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f)); > + int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f)); > + int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f)); > + int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f)); > + int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f)); > + int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f)); > + > +#define dct_long_mul(out, inq, coeff) \ > + int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \ > + int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff) > + > +#define dct_long_mac(out, acc, inq, coeff) \ > + int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \ > + int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff) > + > +#define dct_widen(out, inq) \ > + int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \ > + int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12) > + > +// wide add > +#define dct_wadd(out, a, b) \ > + int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \ > + int32x4_t out##_h = vaddq_s32(a##_h, b##_h) > + > +// wide sub > +#define dct_wsub(out, a, b) \ > + int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \ > + int32x4_t out##_h = vsubq_s32(a##_h, b##_h) > + > +// butterfly a/b, then shift using "shiftop" by "s" and pack > +#define dct_bfly32o(out0,out1, a,b,shiftop,s) \ > + { \ > + dct_wadd(sum, a, b); \ > + dct_wsub(dif, a, b); \ > + out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \ > + out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \ > + } > + > +#define dct_pass(shiftop, shift) \ > + { \ > + /* even part */ \ > + int16x8_t sum26 = vaddq_s16(row2, row6); \ > + dct_long_mul(p1e, sum26, rot0_0); \ > + dct_long_mac(t2e, p1e, row6, rot0_1); \ > + dct_long_mac(t3e, p1e, row2, rot0_2); \ > + int16x8_t sum04 = vaddq_s16(row0, row4); \ > + int16x8_t dif04 = vsubq_s16(row0, row4); \ > + dct_widen(t0e, sum04); \ > + dct_widen(t1e, dif04); \ > + dct_wadd(x0, t0e, t3e); \ > + dct_wsub(x3, t0e, t3e); \ > + dct_wadd(x1, t1e, t2e); \ > + dct_wsub(x2, t1e, t2e); \ > + /* odd part */ \ > + int16x8_t sum15 = vaddq_s16(row1, row5); \ > + int16x8_t sum17 = vaddq_s16(row1, row7); \ > + int16x8_t sum35 = vaddq_s16(row3, row5); \ > + int16x8_t sum37 = vaddq_s16(row3, row7); \ > + int16x8_t sumodd = vaddq_s16(sum17, sum35); \ > + dct_long_mul(p5o, sumodd, rot1_0); \ > + dct_long_mac(p1o, p5o, sum17, rot1_1); \ > + dct_long_mac(p2o, p5o, sum35, rot1_2); \ > + dct_long_mul(p3o, sum37, rot2_0); \ > + dct_long_mul(p4o, sum15, rot2_1); \ > + dct_wadd(sump13o, p1o, p3o); \ > + dct_wadd(sump24o, p2o, p4o); \ > + dct_wadd(sump23o, p2o, p3o); \ > + dct_wadd(sump14o, p1o, p4o); \ > + dct_long_mac(x4, sump13o, row7, rot3_0); \ > + dct_long_mac(x5, sump24o, row5, rot3_1); \ > + dct_long_mac(x6, sump23o, row3, rot3_2); \ > + dct_long_mac(x7, sump14o, row1, rot3_3); \ > + dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \ > + dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \ > + dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \ > + dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \ > + } > + > + // load > + row0 = vld1q_s16(data + 0*8); > + row1 = vld1q_s16(data + 1*8); > + row2 = vld1q_s16(data + 2*8); > + row3 = vld1q_s16(data + 3*8); > + row4 = vld1q_s16(data + 4*8); > + row5 = vld1q_s16(data + 5*8); > + row6 = vld1q_s16(data + 6*8); > + row7 = vld1q_s16(data + 7*8); > + > + // add DC bias > + row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0)); > + > + // column pass > + dct_pass(vrshrn_n_s32, 10); > + > + // 16bit 8x8 transpose > + { > +// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively. > +// whether compilers actually get this is another story, sadly. > +#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; } > +#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); } > +#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); } > + > + // pass 1 > + dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6 > + dct_trn16(row2, row3); > + dct_trn16(row4, row5); > + dct_trn16(row6, row7); > + > + // pass 2 > + dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4 > + dct_trn32(row1, row3); > + dct_trn32(row4, row6); > + dct_trn32(row5, row7); > + > + // pass 3 > + dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0 > + dct_trn64(row1, row5); > + dct_trn64(row2, row6); > + dct_trn64(row3, row7); > + > +#undef dct_trn16 > +#undef dct_trn32 > +#undef dct_trn64 > + } > + > + // row pass > + // vrshrn_n_s32 only supports shifts up to 16, we need > + // 17. so do a non-rounding shift of 16 first then follow > + // up with a rounding shift by 1. > + dct_pass(vshrn_n_s32, 16); > + > + { > + // pack and round > + uint8x8_t p0 = vqrshrun_n_s16(row0, 1); > + uint8x8_t p1 = vqrshrun_n_s16(row1, 1); > + uint8x8_t p2 = vqrshrun_n_s16(row2, 1); > + uint8x8_t p3 = vqrshrun_n_s16(row3, 1); > + uint8x8_t p4 = vqrshrun_n_s16(row4, 1); > + uint8x8_t p5 = vqrshrun_n_s16(row5, 1); > + uint8x8_t p6 = vqrshrun_n_s16(row6, 1); > + uint8x8_t p7 = vqrshrun_n_s16(row7, 1); > + > + // again, these can translate into one instruction, but often don't. > +#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; } > +#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); } > +#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); } > + > + // sadly can't use interleaved stores here since we only write > + // 8 bytes to each scan line! > + > + // 8x8 8-bit transpose pass 1 > + dct_trn8_8(p0, p1); > + dct_trn8_8(p2, p3); > + dct_trn8_8(p4, p5); > + dct_trn8_8(p6, p7); > + > + // pass 2 > + dct_trn8_16(p0, p2); > + dct_trn8_16(p1, p3); > + dct_trn8_16(p4, p6); > + dct_trn8_16(p5, p7); > + > + // pass 3 > + dct_trn8_32(p0, p4); > + dct_trn8_32(p1, p5); > + dct_trn8_32(p2, p6); > + dct_trn8_32(p3, p7); > + > + // store > + vst1_u8(out, p0); out += out_stride; > + vst1_u8(out, p1); out += out_stride; > + vst1_u8(out, p2); out += out_stride; > + vst1_u8(out, p3); out += out_stride; > + vst1_u8(out, p4); out += out_stride; > + vst1_u8(out, p5); out += out_stride; > + vst1_u8(out, p6); out += out_stride; > + vst1_u8(out, p7); > + > +#undef dct_trn8_8 > +#undef dct_trn8_16 > +#undef dct_trn8_32 > + } > + > +#undef dct_long_mul > +#undef dct_long_mac > +#undef dct_widen > +#undef dct_wadd > +#undef dct_wsub > +#undef dct_bfly32o > +#undef dct_pass > +} > + > +#endif // STBI_NEON > + > +#define STBI__MARKER_none 0xff > +// if there's a pending marker from the entropy stream, return that > +// otherwise, fetch from the stream and get a marker. if there's no > +// marker, return 0xff, which is never a valid marker value > +static stbi_uc stbi__get_marker(stbi__jpeg *j) > +{ > + stbi_uc x; > + if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; } > + x = stbi__get8(j->s); > + if (x != 0xff) return STBI__MARKER_none; > + while (x == 0xff) > + x = stbi__get8(j->s); // consume repeated 0xff fill bytes > + return x; > +} > + > +// in each scan, we'll have scan_n components, and the order > +// of the components is specified by order[] > +#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) > + > +// after a restart interval, stbi__jpeg_reset the entropy decoder and > +// the dc prediction > +static void stbi__jpeg_reset(stbi__jpeg *j) > +{ > + j->code_bits = 0; > + j->code_buffer = 0; > + j->nomore = 0; > + j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0; > + j->marker = STBI__MARKER_none; > + j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; > + j->eob_run = 0; > + // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, > + // since we don't even allow 1<<30 pixels > +} > + > +static int stbi__parse_entropy_coded_data(stbi__jpeg *z) > +{ > + stbi__jpeg_reset(z); > + if (!z->progressive) { > + if (z->scan_n == 1) { > + int i,j; > + STBI_SIMD_ALIGN(short, data[64]); > + int n = z->order[0]; > + // non-interleaved data, we just need to process one block at a time, > + // in trivial scanline order > + // number of blocks to do just depends on how many actual "pixels" this > + // component has, independent of interleaved MCU blocking and such > + int w = (z->img_comp[n].x+7) >> 3; > + int h = (z->img_comp[n].y+7) >> 3; > + for (j=0; j < h; ++j) { > + for (i=0; i < w; ++i) { > + int ha = z->img_comp[n].ha; > + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; > + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); > + // every data block is an MCU, so countdown the restart interval > + if (--z->todo <= 0) { > + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); > + // if it's NOT a restart, then just bail, so we get corrupt data > + // rather than no data > + if (!STBI__RESTART(z->marker)) return 1; > + stbi__jpeg_reset(z); > + } > + } > + } > + return 1; > + } else { // interleaved > + int i,j,k,x,y; > + STBI_SIMD_ALIGN(short, data[64]); > + for (j=0; j < z->img_mcu_y; ++j) { > + for (i=0; i < z->img_mcu_x; ++i) { > + // scan an interleaved mcu... process scan_n components in order > + for (k=0; k < z->scan_n; ++k) { > + int n = z->order[k]; > + // scan out an mcu's worth of this component; that's just determined > + // by the basic H and V specified for the component > + for (y=0; y < z->img_comp[n].v; ++y) { > + for (x=0; x < z->img_comp[n].h; ++x) { > + int x2 = (i*z->img_comp[n].h + x)*8; > + int y2 = (j*z->img_comp[n].v + y)*8; > + int ha = z->img_comp[n].ha; > + if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0; > + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data); > + } > + } > + } > + // after all interleaved components, that's an interleaved MCU, > + // so now count down the restart interval > + if (--z->todo <= 0) { > + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); > + if (!STBI__RESTART(z->marker)) return 1; > + stbi__jpeg_reset(z); > + } > + } > + } > + return 1; > + } > + } else { > + if (z->scan_n == 1) { > + int i,j; > + int n = z->order[0]; > + // non-interleaved data, we just need to process one block at a time, > + // in trivial scanline order > + // number of blocks to do just depends on how many actual "pixels" this > + // component has, independent of interleaved MCU blocking and such > + int w = (z->img_comp[n].x+7) >> 3; > + int h = (z->img_comp[n].y+7) >> 3; > + for (j=0; j < h; ++j) { > + for (i=0; i < w; ++i) { > + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); > + if (z->spec_start == 0) { > + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) > + return 0; > + } else { > + int ha = z->img_comp[n].ha; > + if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha])) > + return 0; > + } > + // every data block is an MCU, so countdown the restart interval > + if (--z->todo <= 0) { > + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); > + if (!STBI__RESTART(z->marker)) return 1; > + stbi__jpeg_reset(z); > + } > + } > + } > + return 1; > + } else { // interleaved > + int i,j,k,x,y; > + for (j=0; j < z->img_mcu_y; ++j) { > + for (i=0; i < z->img_mcu_x; ++i) { > + // scan an interleaved mcu... process scan_n components in order > + for (k=0; k < z->scan_n; ++k) { > + int n = z->order[k]; > + // scan out an mcu's worth of this component; that's just determined > + // by the basic H and V specified for the component > + for (y=0; y < z->img_comp[n].v; ++y) { > + for (x=0; x < z->img_comp[n].h; ++x) { > + int x2 = (i*z->img_comp[n].h + x); > + int y2 = (j*z->img_comp[n].v + y); > + short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w); > + if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n)) > + return 0; > + } > + } > + } > + // after all interleaved components, that's an interleaved MCU, > + // so now count down the restart interval > + if (--z->todo <= 0) { > + if (z->code_bits < 24) stbi__grow_buffer_unsafe(z); > + if (!STBI__RESTART(z->marker)) return 1; > + stbi__jpeg_reset(z); > + } > + } > + } > + return 1; > + } > + } > +} > + > +static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant) > +{ > + int i; > + for (i=0; i < 64; ++i) > + data[i] *= dequant[i]; > +} > + > +static void stbi__jpeg_finish(stbi__jpeg *z) > +{ > + if (z->progressive) { > + // dequantize and idct the data > + int i,j,n; > + for (n=0; n < z->s->img_n; ++n) { > + int w = (z->img_comp[n].x+7) >> 3; > + int h = (z->img_comp[n].y+7) >> 3; > + for (j=0; j < h; ++j) { > + for (i=0; i < w; ++i) { > + short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w); > + stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]); > + z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data); > + } > + } > + } > + } > +} > + > +static int stbi__process_marker(stbi__jpeg *z, int m) > +{ > + int L; > + switch (m) { > + case STBI__MARKER_none: // no marker found > + return stbi__err("expected marker","Corrupt JPEG"); > + > + case 0xDD: // DRI - specify restart interval > + if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG"); > + z->restart_interval = stbi__get16be(z->s); > + return 1; > + > + case 0xDB: // DQT - define quantization table > + L = stbi__get16be(z->s)-2; > + while (L > 0) { > + int q = stbi__get8(z->s); > + int p = q >> 4, sixteen = (p != 0); > + int t = q & 15,i; > + if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG"); > + if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); > + > + for (i=0; i < 64; ++i) > + z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s)); > + L -= (sixteen ? 129 : 65); > + } > + return L==0; > + > + case 0xC4: // DHT - define huffman table > + L = stbi__get16be(z->s)-2; > + while (L > 0) { > + stbi_uc *v; > + int sizes[16],i,n=0; > + int q = stbi__get8(z->s); > + int tc = q >> 4; > + int th = q & 15; > + if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG"); > + for (i=0; i < 16; ++i) { > + sizes[i] = stbi__get8(z->s); > + n += sizes[i]; > + } > + L -= 17; > + if (tc == 0) { > + if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0; > + v = z->huff_dc[th].values; > + } else { > + if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0; > + v = z->huff_ac[th].values; > + } > + for (i=0; i < n; ++i) > + v[i] = stbi__get8(z->s); > + if (tc != 0) > + stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th); > + L -= n; > + } > + return L==0; > + } > + > + // check for comment block or APP blocks > + if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { > + L = stbi__get16be(z->s); > + if (L < 2) { > + if (m == 0xFE) > + return stbi__err("bad COM len","Corrupt JPEG"); > + else > + return stbi__err("bad APP len","Corrupt JPEG"); > + } > + L -= 2; > + > + if (m == 0xE0 && L >= 5) { // JFIF APP0 segment > + static const unsigned char tag[5] = {'J','F','I','F','\0'}; > + int ok = 1; > + int i; > + for (i=0; i < 5; ++i) > + if (stbi__get8(z->s) != tag[i]) > + ok = 0; > + L -= 5; > + if (ok) > + z->jfif = 1; > + } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment > + static const unsigned char tag[6] = {'A','d','o','b','e','\0'}; > + int ok = 1; > + int i; > + for (i=0; i < 6; ++i) > + if (stbi__get8(z->s) != tag[i]) > + ok = 0; > + L -= 6; > + if (ok) { > + stbi__get8(z->s); // version > + stbi__get16be(z->s); // flags0 > + stbi__get16be(z->s); // flags1 > + z->app14_color_transform = stbi__get8(z->s); // color transform > + L -= 6; > + } > + } > + > + stbi__skip(z->s, L); > + return 1; > + } > + > + return stbi__err("unknown marker","Corrupt JPEG"); > +} > + > +// after we see SOS > +static int stbi__process_scan_header(stbi__jpeg *z) > +{ > + int i; > + int Ls = stbi__get16be(z->s); > + z->scan_n = stbi__get8(z->s); > + if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG"); > + if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG"); > + for (i=0; i < z->scan_n; ++i) { > + int id = stbi__get8(z->s), which; > + int q = stbi__get8(z->s); > + for (which = 0; which < z->s->img_n; ++which) > + if (z->img_comp[which].id == id) > + break; > + if (which == z->s->img_n) return 0; // no match > + z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG"); > + z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG"); > + z->order[i] = which; > + } > + > + { > + int aa; > + z->spec_start = stbi__get8(z->s); > + z->spec_end = stbi__get8(z->s); // should be 63, but might be 0 > + aa = stbi__get8(z->s); > + z->succ_high = (aa >> 4); > + z->succ_low = (aa & 15); > + if (z->progressive) { > + if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13) > + return stbi__err("bad SOS", "Corrupt JPEG"); > + } else { > + if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG"); > + if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG"); > + z->spec_end = 63; > + } > + } > + > + return 1; > +} > + > +static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why) > +{ > + int i; > + for (i=0; i < ncomp; ++i) { > + if (z->img_comp[i].raw_data) { > + STBI_FREE(z->img_comp[i].raw_data); > + z->img_comp[i].raw_data = NULL; > + z->img_comp[i].data = NULL; > + } > + if (z->img_comp[i].raw_coeff) { > + STBI_FREE(z->img_comp[i].raw_coeff); > + z->img_comp[i].raw_coeff = 0; > + z->img_comp[i].coeff = 0; > + } > + if (z->img_comp[i].linebuf) { > + STBI_FREE(z->img_comp[i].linebuf); > + z->img_comp[i].linebuf = NULL; > + } > + } > + return why; > +} > + > +static int stbi__process_frame_header(stbi__jpeg *z, int scan) > +{ > + stbi__context *s = z->s; > + int Lf,p,i,q, h_max=1,v_max=1,c; > + Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG > + p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline > + s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG > + s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires > + 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; > + } > + > + // compute interleaved mcu info > + z->img_h_max = h_max; > + z->img_v_max = v_max; > + z->img_mcu_w = h_max * 8; > + z->img_mcu_h = v_max * 8; > + // these sizes can't be more than 17 bits > + z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; > + z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; > + > + for (i=0; i < s->img_n; ++i) { > + // number of effective pixels (e.g. for non-interleaved MCU) > + z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; > + z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; > + // to simplify generation, we'll allocate enough memory to decode > + // the bogus oversized data from using interleaved MCUs and their > + // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't > + // discard the extra data until colorspace conversion > + // > + // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier) > + // so these muls can't overflow with 32-bit ints (which we require) > + z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; > + z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; > + z->img_comp[i].coeff = 0; > + z->img_comp[i].raw_coeff = 0; > + z->img_comp[i].linebuf = NULL; > + z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15); > + if (z->img_comp[i].raw_data == NULL) > + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); > + // align blocks for idct using mmx/sse > + z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); > + if (z->progressive) { > + // w2, h2 are multiples of 8 (see above) > + z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8; > + z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8; > + z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15); > + if (z->img_comp[i].raw_coeff == NULL) > + return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory")); > + z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15); > + } > + } > + > + return 1; > +} > + > +// use comparisons since in some cases we handle more than one case (e.g. SOF) > +#define stbi__DNL(x) ((x) == 0xdc) > +#define stbi__SOI(x) ((x) == 0xd8) > +#define stbi__EOI(x) ((x) == 0xd9) > +#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2) > +#define stbi__SOS(x) ((x) == 0xda) > + > +#define stbi__SOF_progressive(x) ((x) == 0xc2) > + > +static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) > +{ > + int m; > + z->jfif = 0; > + z->app14_color_transform = -1; // valid values are 0,1,2 > + z->marker = STBI__MARKER_none; // initialize cached marker to empty > + m = stbi__get_marker(z); > + if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); > + if (scan == STBI__SCAN_type) return 1; > + m = stbi__get_marker(z); > + while (!stbi__SOF(m)) { > + if (!stbi__process_marker(z,m)) return 0; > + m = stbi__get_marker(z); > + while (m == STBI__MARKER_none) { > + // some files have extra padding after their blocks, so ok, we'll scan > + if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG"); > + m = stbi__get_marker(z); > + } > + } > + z->progressive = stbi__SOF_progressive(m); > + if (!stbi__process_frame_header(z, scan)) return 0; > + return 1; > +} > + > +// decode image to YCbCr format > +static int stbi__decode_jpeg_image(stbi__jpeg *j) > +{ > + int m; > + for (m = 0; m < 4; m++) { > + j->img_comp[m].raw_data = NULL; > + j->img_comp[m].raw_coeff = NULL; > + } > + j->restart_interval = 0; > + if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0; > + m = stbi__get_marker(j); > + while (!stbi__EOI(m)) { > + if (stbi__SOS(m)) { > + if (!stbi__process_scan_header(j)) return 0; > + if (!stbi__parse_entropy_coded_data(j)) return 0; > + if (j->marker == STBI__MARKER_none ) { > + // handle 0s at the end of image data from IP Kamera 9060 > + while (!stbi__at_eof(j->s)) { > + int x = stbi__get8(j->s); > + if (x == 255) { > + j->marker = stbi__get8(j->s); > + break; > + } > + } > + // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 > + } > + } else if (stbi__DNL(m)) { > + int Ld = stbi__get16be(j->s); > + stbi__uint32 NL = stbi__get16be(j->s); > + if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG"); > + if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG"); > + } else { > + if (!stbi__process_marker(j, m)) return 0; > + } > + m = stbi__get_marker(j); > + } > + if (j->progressive) > + stbi__jpeg_finish(j); > + return 1; > +} > + > +// static jfif-centered resampling (across block boundaries) > + > +typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1, > + int w, int hs); > + > +#define stbi__div4(x) ((stbi_uc) ((x) >> 2)) > + > +static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) > +{ > + STBI_NOTUSED(out); > + STBI_NOTUSED(in_far); > + STBI_NOTUSED(w); > + STBI_NOTUSED(hs); > + return in_near; > +} > + > +static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) > +{ > + // need to generate two samples vertically for every one in input > + int i; > + STBI_NOTUSED(hs); > + for (i=0; i < w; ++i) > + out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2); > + return out; > +} > + > +static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) > +{ > + // need to generate two samples horizontally for every one in input > + int i; > + stbi_uc *input = in_near; > + > + if (w == 1) { > + // if only one sample, can't do any interpolation > + out[0] = out[1] = input[0]; > + return out; > + } > + > + out[0] = input[0]; > + out[1] = stbi__div4(input[0]*3 + input[1] + 2); > + for (i=1; i < w-1; ++i) { > + int n = 3*input[i]+2; > + out[i*2+0] = stbi__div4(n+input[i-1]); > + out[i*2+1] = stbi__div4(n+input[i+1]); > + } > + out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2); > + out[i*2+1] = input[w-1]; > + > + STBI_NOTUSED(in_far); > + STBI_NOTUSED(hs); > + > + return out; > +} > + > +#define stbi__div16(x) ((stbi_uc) ((x) >> 4)) > + > +static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) > +{ > + // need to generate 2x2 samples for every one in input > + int i,t0,t1; > + if (w == 1) { > + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); > + return out; > + } > + > + t1 = 3*in_near[0] + in_far[0]; > + out[0] = stbi__div4(t1+2); > + for (i=1; i < w; ++i) { > + t0 = t1; > + t1 = 3*in_near[i]+in_far[i]; > + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); > + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); > + } > + out[w*2-1] = stbi__div4(t1+2); > + > + STBI_NOTUSED(hs); > + > + return out; > +} > + > +#if defined(STBI_SSE2) || defined(STBI_NEON) > +static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) > +{ > + // need to generate 2x2 samples for every one in input > + int i=0,t0,t1; > + > + if (w == 1) { > + out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2); > + return out; > + } > + > + t1 = 3*in_near[0] + in_far[0]; > + // process groups of 8 pixels for as long as we can. > + // note we can't handle the last pixel in a row in this loop > + // because we need to handle the filter boundary conditions. > + for (; i < ((w-1) & ~7); i += 8) { > +#if defined(STBI_SSE2) > + // load and perform the vertical filtering pass > + // this uses 3*x + y = 4*x + (y - x) > + __m128i zero = _mm_setzero_si128(); > + __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i)); > + __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i)); > + __m128i farw = _mm_unpacklo_epi8(farb, zero); > + __m128i nearw = _mm_unpacklo_epi8(nearb, zero); > + __m128i diff = _mm_sub_epi16(farw, nearw); > + __m128i nears = _mm_slli_epi16(nearw, 2); > + __m128i curr = _mm_add_epi16(nears, diff); // current row > + > + // horizontal filter works the same based on shifted vers of current > + // row. "prev" is current row shifted right by 1 pixel; we need to > + // insert the previous pixel value (from t1). > + // "next" is current row shifted left by 1 pixel, with first pixel > + // of next block of 8 pixels added in. > + __m128i prv0 = _mm_slli_si128(curr, 2); > + __m128i nxt0 = _mm_srli_si128(curr, 2); > + __m128i prev = _mm_insert_epi16(prv0, t1, 0); > + __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7); > + > + // horizontal filter, polyphase implementation since it's convenient: > + // even pixels = 3*cur + prev = cur*4 + (prev - cur) > + // odd pixels = 3*cur + next = cur*4 + (next - cur) > + // note the shared term. > + __m128i bias = _mm_set1_epi16(8); > + __m128i curs = _mm_slli_epi16(curr, 2); > + __m128i prvd = _mm_sub_epi16(prev, curr); > + __m128i nxtd = _mm_sub_epi16(next, curr); > + __m128i curb = _mm_add_epi16(curs, bias); > + __m128i even = _mm_add_epi16(prvd, curb); > + __m128i odd = _mm_add_epi16(nxtd, curb); > + > + // interleave even and odd pixels, then undo scaling. > + __m128i int0 = _mm_unpacklo_epi16(even, odd); > + __m128i int1 = _mm_unpackhi_epi16(even, odd); > + __m128i de0 = _mm_srli_epi16(int0, 4); > + __m128i de1 = _mm_srli_epi16(int1, 4); > + > + // pack and write output > + __m128i outv = _mm_packus_epi16(de0, de1); > + _mm_storeu_si128((__m128i *) (out + i*2), outv); > +#elif defined(STBI_NEON) > + // load and perform the vertical filtering pass > + // this uses 3*x + y = 4*x + (y - x) > + uint8x8_t farb = vld1_u8(in_far + i); > + uint8x8_t nearb = vld1_u8(in_near + i); > + int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb)); > + int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2)); > + int16x8_t curr = vaddq_s16(nears, diff); // current row > + > + // horizontal filter works the same based on shifted vers of current > + // row. "prev" is current row shifted right by 1 pixel; we need to > + // insert the previous pixel value (from t1). > + // "next" is current row shifted left by 1 pixel, with first pixel > + // of next block of 8 pixels added in. > + int16x8_t prv0 = vextq_s16(curr, curr, 7); > + int16x8_t nxt0 = vextq_s16(curr, curr, 1); > + int16x8_t prev = vsetq_lane_s16(t1, prv0, 0); > + int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7); > + > + // horizontal filter, polyphase implementation since it's convenient: > + // even pixels = 3*cur + prev = cur*4 + (prev - cur) > + // odd pixels = 3*cur + next = cur*4 + (next - cur) > + // note the shared term. > + int16x8_t curs = vshlq_n_s16(curr, 2); > + int16x8_t prvd = vsubq_s16(prev, curr); > + int16x8_t nxtd = vsubq_s16(next, curr); > + int16x8_t even = vaddq_s16(curs, prvd); > + int16x8_t odd = vaddq_s16(curs, nxtd); > + > + // undo scaling and round, then store with even/odd phases interleaved > + uint8x8x2_t o; > + o.val[0] = vqrshrun_n_s16(even, 4); > + o.val[1] = vqrshrun_n_s16(odd, 4); > + vst2_u8(out + i*2, o); > +#endif > + > + // "previous" value for next iter > + t1 = 3*in_near[i+7] + in_far[i+7]; > + } > + > + t0 = t1; > + t1 = 3*in_near[i] + in_far[i]; > + out[i*2] = stbi__div16(3*t1 + t0 + 8); > + > + for (++i; i < w; ++i) { > + t0 = t1; > + t1 = 3*in_near[i]+in_far[i]; > + out[i*2-1] = stbi__div16(3*t0 + t1 + 8); > + out[i*2 ] = stbi__div16(3*t1 + t0 + 8); > + } > + out[w*2-1] = stbi__div4(t1+2); > + > + STBI_NOTUSED(hs); > + > + return out; > +} > +#endif > + > +static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs) > +{ > + // resample with nearest-neighbor > + int i,j; > + STBI_NOTUSED(in_far); > + for (i=0; i < w; ++i) > + for (j=0; j < hs; ++j) > + out[i*hs+j] = in_near[i]; > + return out; > +} > + > +// this is a reduced-precision calculation of YCbCr-to-RGB introduced > +// to make sure the code produces the same results in both SIMD and scalar > +#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) > +static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) > +{ > + int i; > + for (i=0; i < count; ++i) { > + int y_fixed = (y[i] << 20) + (1<<19); // rounding > + int r,g,b; > + int cr = pcr[i] - 128; > + int cb = pcb[i] - 128; > + r = y_fixed + cr* stbi__float2fixed(1.40200f); > + g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); > + b = y_fixed + cb* stbi__float2fixed(1.77200f); > + r >>= 20; > + g >>= 20; > + b >>= 20; > + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } > + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } > + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } > + out[0] = (stbi_uc)r; > + out[1] = (stbi_uc)g; > + out[2] = (stbi_uc)b; > + out[3] = 255; > + out += step; > + } > +} > + > +#if defined(STBI_SSE2) || defined(STBI_NEON) > +static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step) > +{ > + int i = 0; > + > +#ifdef STBI_SSE2 > + // step == 3 is pretty ugly on the final interleave, and i'm not convinced > + // it's useful in practice (you wouldn't use it for textures, for example). > + // so just accelerate step == 4 case. > + if (step == 4) { > + // this is a fairly straightforward implementation and not super-optimized. > + __m128i signflip = _mm_set1_epi8(-0x80); > + __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f)); > + __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f)); > + __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f)); > + __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f)); > + __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128); > + __m128i xw = _mm_set1_epi16(255); // alpha channel > + > + for (; i+7 < count; i += 8) { > + // load > + __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i)); > + __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i)); > + __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i)); > + __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128 > + __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128 > + > + // unpack to short (and left-shift cr, cb by 8) > + __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes); > + __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased); > + __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased); > + > + // color transform > + __m128i yws = _mm_srli_epi16(yw, 4); > + __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw); > + __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw); > + __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1); > + __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1); > + __m128i rws = _mm_add_epi16(cr0, yws); > + __m128i gwt = _mm_add_epi16(cb0, yws); > + __m128i bws = _mm_add_epi16(yws, cb1); > + __m128i gws = _mm_add_epi16(gwt, cr1); > + > + // descale > + __m128i rw = _mm_srai_epi16(rws, 4); > + __m128i bw = _mm_srai_epi16(bws, 4); > + __m128i gw = _mm_srai_epi16(gws, 4); > + > + // back to byte, set up for transpose > + __m128i brb = _mm_packus_epi16(rw, bw); > + __m128i gxb = _mm_packus_epi16(gw, xw); > + > + // transpose to interleave channels > + __m128i t0 = _mm_unpacklo_epi8(brb, gxb); > + __m128i t1 = _mm_unpackhi_epi8(brb, gxb); > + __m128i o0 = _mm_unpacklo_epi16(t0, t1); > + __m128i o1 = _mm_unpackhi_epi16(t0, t1); > + > + // store > + _mm_storeu_si128((__m128i *) (out + 0), o0); > + _mm_storeu_si128((__m128i *) (out + 16), o1); > + out += 32; > + } > + } > +#endif > + > +#ifdef STBI_NEON > + // in this version, step=3 support would be easy to add. but is there demand? > + if (step == 4) { > + // this is a fairly straightforward implementation and not super-optimized. > + uint8x8_t signflip = vdup_n_u8(0x80); > + int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f)); > + int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f)); > + int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f)); > + int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f)); > + > + for (; i+7 < count; i += 8) { > + // load > + uint8x8_t y_bytes = vld1_u8(y + i); > + uint8x8_t cr_bytes = vld1_u8(pcr + i); > + uint8x8_t cb_bytes = vld1_u8(pcb + i); > + int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip)); > + int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip)); > + > + // expand to s16 > + int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4)); > + int16x8_t crw = vshll_n_s8(cr_biased, 7); > + int16x8_t cbw = vshll_n_s8(cb_biased, 7); > + > + // color transform > + int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0); > + int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0); > + int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1); > + int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1); > + int16x8_t rws = vaddq_s16(yws, cr0); > + int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1); > + int16x8_t bws = vaddq_s16(yws, cb1); > + > + // undo scaling, round, convert to byte > + uint8x8x4_t o; > + o.val[0] = vqrshrun_n_s16(rws, 4); > + o.val[1] = vqrshrun_n_s16(gws, 4); > + o.val[2] = vqrshrun_n_s16(bws, 4); > + o.val[3] = vdup_n_u8(255); > + > + // store, interleaving r/g/b/a > + vst4_u8(out, o); > + out += 8*4; > + } > + } > +#endif > + > + for (; i < count; ++i) { > + int y_fixed = (y[i] << 20) + (1<<19); // rounding > + int r,g,b; > + int cr = pcr[i] - 128; > + int cb = pcb[i] - 128; > + r = y_fixed + cr* stbi__float2fixed(1.40200f); > + g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); > + b = y_fixed + cb* stbi__float2fixed(1.77200f); > + r >>= 20; > + g >>= 20; > + b >>= 20; > + if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } > + if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } > + if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } > + out[0] = (stbi_uc)r; > + out[1] = (stbi_uc)g; > + out[2] = (stbi_uc)b; > + out[3] = 255; > + out += step; > + } > +} > +#endif > + > +// set up the kernels > +static void stbi__setup_jpeg(stbi__jpeg *j) > +{ > + j->idct_block_kernel = stbi__idct_block; > + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row; > + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2; > + > +#ifdef STBI_SSE2 > + if (stbi__sse2_available()) { > + j->idct_block_kernel = stbi__idct_simd; > + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; > + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; > + } > +#endif > + > +#ifdef STBI_NEON > + j->idct_block_kernel = stbi__idct_simd; > + j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; > + j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; > +#endif > +} > + > +// clean up the temporary component buffers > +static void stbi__cleanup_jpeg(stbi__jpeg *j) > +{ > + stbi__free_jpeg_components(j, j->s->img_n, 0); > +} > + > +typedef struct > +{ > + resample_row_func resample; > + stbi_uc *line0,*line1; > + int hs,vs; // expansion factor in each axis > + int w_lores; // horizontal pixels pre-expansion > + int ystep; // how far through vertical expansion we are > + int ypos; // which pre-expansion row we're on > +} stbi__resample; > + > +// fast 0..255 * 0..255 => 0..255 rounded multiplication > +static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y) > +{ > + unsigned int t = x*y + 128; > + return (stbi_uc) ((t + (t >>8)) >> 8); > +} > + > +static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) > +{ > + int n, decode_n, is_rgb; > + z->s->img_n = 0; // make stbi__cleanup_jpeg safe > + > + // validate req_comp > + if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); > + > + // load a jpeg image from whichever source, but leave in YCbCr format > + if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } > + > + // determine actual number of components to generate > + n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1; > + > + is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif)); > + > + if (z->s->img_n == 3 && n < 3 && !is_rgb) > + decode_n = 1; > + else > + decode_n = z->s->img_n; > + > + // resample and color-convert > + { > + int k; > + unsigned int i,j; > + stbi_uc *output; > + stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL }; > + > + stbi__resample res_comp[4]; > + > + for (k=0; k < decode_n; ++k) { > + stbi__resample *r = &res_comp[k]; > + > + // allocate line buffer big enough for upsampling off the edges > + // with upsample factor of 4 > + z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3); > + if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } > + > + r->hs = z->img_h_max / z->img_comp[k].h; > + r->vs = z->img_v_max / z->img_comp[k].v; > + r->ystep = r->vs >> 1; > + r->w_lores = (z->s->img_x + r->hs-1) / r->hs; > + r->ypos = 0; > + r->line0 = r->line1 = z->img_comp[k].data; > + > + if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; > + else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2; > + else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2; > + else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel; > + else r->resample = stbi__resample_row_generic; > + } > + > + // can't error after this so, this is safe > + output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1); > + if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); } > + > + // now go ahead and resample > + for (j=0; j < z->s->img_y; ++j) { > + stbi_uc *out = output + n * z->s->img_x * j; > + for (k=0; k < decode_n; ++k) { > + stbi__resample *r = &res_comp[k]; > + int y_bot = r->ystep >= (r->vs >> 1); > + coutput[k] = r->resample(z->img_comp[k].linebuf, > + y_bot ? r->line1 : r->line0, > + y_bot ? r->line0 : r->line1, > + r->w_lores, r->hs); > + if (++r->ystep >= r->vs) { > + r->ystep = 0; > + r->line0 = r->line1; > + if (++r->ypos < z->img_comp[k].y) > + r->line1 += z->img_comp[k].w2; > + } > + } > + if (n >= 3) { > + stbi_uc *y = coutput[0]; > + if (z->s->img_n == 3) { > + if (is_rgb) { > + for (i=0; i < z->s->img_x; ++i) { > + out[0] = y[i]; > + out[1] = coutput[1][i]; > + out[2] = coutput[2][i]; > + out[3] = 255; > + out += n; > + } > + } else { > + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); > + } > + } else if (z->s->img_n == 4) { > + if (z->app14_color_transform == 0) { // CMYK > + for (i=0; i < z->s->img_x; ++i) { > + stbi_uc m = coutput[3][i]; > + out[0] = stbi__blinn_8x8(coutput[0][i], m); > + out[1] = stbi__blinn_8x8(coutput[1][i], m); > + out[2] = stbi__blinn_8x8(coutput[2][i], m); > + out[3] = 255; > + out += n; > + } > + } else if (z->app14_color_transform == 2) { // YCCK > + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); > + for (i=0; i < z->s->img_x; ++i) { > + stbi_uc m = coutput[3][i]; > + out[0] = stbi__blinn_8x8(255 - out[0], m); > + out[1] = stbi__blinn_8x8(255 - out[1], m); > + out[2] = stbi__blinn_8x8(255 - out[2], m); > + out += n; > + } > + } else { // YCbCr + alpha? Ignore the fourth channel for now > + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); > + } > + } else > + for (i=0; i < z->s->img_x; ++i) { > + out[0] = out[1] = out[2] = y[i]; > + out[3] = 255; // not used if n==3 > + out += n; > + } > + } else { > + if (is_rgb) { > + if (n == 1) > + for (i=0; i < z->s->img_x; ++i) > + *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); > + else { > + for (i=0; i < z->s->img_x; ++i, out += 2) { > + out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); > + out[1] = 255; > + } > + } > + } else if (z->s->img_n == 4 && z->app14_color_transform == 0) { > + for (i=0; i < z->s->img_x; ++i) { > + stbi_uc m = coutput[3][i]; > + stbi_uc r = stbi__blinn_8x8(coutput[0][i], m); > + stbi_uc g = stbi__blinn_8x8(coutput[1][i], m); > + stbi_uc b = stbi__blinn_8x8(coutput[2][i], m); > + out[0] = stbi__compute_y(r, g, b); > + out[1] = 255; > + out += n; > + } > + } else if (z->s->img_n == 4 && z->app14_color_transform == 2) { > + for (i=0; i < z->s->img_x; ++i) { > + out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]); > + out[1] = 255; > + out += n; > + } > + } else { > + stbi_uc *y = coutput[0]; > + if (n == 1) > + for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; > + else > + for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; } > + } > + } > + } > + stbi__cleanup_jpeg(z); > + *out_x = z->s->img_x; > + *out_y = z->s->img_y; > + if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output > + return output; > + } > +} > + > +static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) > +{ > + unsigned char* result; > + stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); > + STBI_NOTUSED(ri); > + j->s = s; > + stbi__setup_jpeg(j); > + result = load_jpeg_image(j, x,y,comp,req_comp); > + STBI_FREE(j); > + return result; > +} > + > +static int stbi__jpeg_test(stbi__context *s) > +{ > + int r; > + stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); > + j->s = s; > + stbi__setup_jpeg(j); > + r = stbi__decode_jpeg_header(j, STBI__SCAN_type); > + stbi__rewind(s); > + STBI_FREE(j); > + return r; > +} > + > +static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) > +{ > + if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) { > + stbi__rewind( j->s ); > + return 0; > + } > + if (x) *x = j->s->img_x; > + if (y) *y = j->s->img_y; > + if (comp) *comp = j->s->img_n >= 3 ? 3 : 1; > + return 1; > +} > + > +static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp) > +{ > + int result; > + stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg))); > + j->s = s; > + result = stbi__jpeg_info_raw(j, x, y, comp); > + STBI_FREE(j); > + return result; > +} > +#endif > + > +// public domain zlib decode v0.2 Sean Barrett 2006-11-18 > +// simple implementation > +// - all input must be provided in an upfront buffer > +// - all output is written to a single output buffer (can malloc/realloc) > +// performance > +// - fast huffman > + > +#ifndef STBI_NO_ZLIB > + > +// fast-way is faster to check than jpeg huffman, but slow way is slower > +#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables > +#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1) > + > +// zlib-style huffman encoding > +// (jpegs packs from left, zlib from right, so can't share code) > +typedef struct > +{ > + stbi__uint16 fast[1 << STBI__ZFAST_BITS]; > + stbi__uint16 firstcode[16]; > + int maxcode[17]; > + stbi__uint16 firstsymbol[16]; > + stbi_uc size[288]; > + stbi__uint16 value[288]; > +} stbi__zhuffman; > + > +stbi_inline static int stbi__bitreverse16(int n) > +{ > + n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); > + n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); > + n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); > + n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); > + return n; > +} > + > +stbi_inline static int stbi__bit_reverse(int v, int bits) > +{ > + STBI_ASSERT(bits <= 16); > + // to bit reverse n bits, reverse 16 and shift > + // e.g. 11 bits, bit reverse and shift away 5 > + return stbi__bitreverse16(v) >> (16-bits); > +} > + > +static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num) > +{ > + int i,k=0; > + int code, next_code[16], sizes[17]; > + > + // DEFLATE spec for generating codes > + memset(sizes, 0, sizeof(sizes)); > + memset(z->fast, 0, sizeof(z->fast)); > + for (i=0; i < num; ++i) > + ++sizes[sizelist[i]]; > + sizes[0] = 0; > + for (i=1; i < 16; ++i) > + if (sizes[i] > (1 << i)) > + return stbi__err("bad sizes", "Corrupt PNG"); > + code = 0; > + for (i=1; i < 16; ++i) { > + next_code[i] = code; > + z->firstcode[i] = (stbi__uint16) code; > + z->firstsymbol[i] = (stbi__uint16) k; > + code = (code + sizes[i]); > + if (sizes[i]) > + if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG"); > + z->maxcode[i] = code << (16-i); // preshift for inner loop > + code <<= 1; > + k += sizes[i]; > + } > + z->maxcode[16] = 0x10000; // sentinel > + for (i=0; i < num; ++i) { > + int s = sizelist[i]; > + if (s) { > + int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; > + stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i); > + z->size [c] = (stbi_uc ) s; > + z->value[c] = (stbi__uint16) i; > + if (s <= STBI__ZFAST_BITS) { > + int j = stbi__bit_reverse(next_code[s],s); > + while (j < (1 << STBI__ZFAST_BITS)) { > + z->fast[j] = fastv; > + j += (1 << s); > + } > + } > + ++next_code[s]; > + } > + } > + return 1; > +} > + > +// zlib-from-memory implementation for PNG reading > +// because PNG allows splitting the zlib stream arbitrarily, > +// and it's annoying structurally to have PNG call ZLIB call PNG, > +// we require PNG read all the IDATs and combine them into a single > +// memory buffer > + > +typedef struct > +{ > + stbi_uc *zbuffer, *zbuffer_end; > + int num_bits; > + stbi__uint32 code_buffer; > + > + char *zout; > + char *zout_start; > + char *zout_end; > + int z_expandable; > + > + stbi__zhuffman z_length, z_distance; > +} stbi__zbuf; > + > +stbi_inline static 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 ((long unsigned int) b >= sizeof (z->size)) 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[288] = > +{ > + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, > + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, > + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, > + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, > + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, > + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, > + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, > + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, > + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8 > +}; > +static const stbi_uc stbi__zdefault_distance[32] = > +{ > + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 > +}; > +/* > +Init algorithm: > +{ > + int i; // use <= to match clearly with spec > + for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; > + for ( ; i <= 255; ++i) stbi__zdefault_length[i] = 9; > + for ( ; i <= 279; ++i) stbi__zdefault_length[i] = 7; > + for ( ; i <= 287; ++i) stbi__zdefault_length[i] = 8; > + > + for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; > +} > +*/ > + > +static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) > +{ > + int final, type; > + if (parse_header) > + if (!stbi__parse_zlib_header(a)) return 0; > + a->num_bits = 0; > + a->code_buffer = 0; > + do { > + final = stbi__zreceive(a,1); > + type = stbi__zreceive(a,2); > + if (type == 0) { > + if (!stbi__parse_uncompressed_block(a)) return 0; > + } else if (type == 3) { > + return 0; > + } else { > + if (type == 1) { > + // use fixed code lengths > + if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0; > + if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; > + } else { > + if (!stbi__compute_huffman_codes(a)) return 0; > + } > + if (!stbi__parse_huffman_block(a)) return 0; > + } > + } while (!final); > + return 1; > +} > + > +static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header) > +{ > + a->zout_start = obuf; > + a->zout = obuf; > + a->zout_end = obuf + olen; > + a->z_expandable = exp; > + > + return stbi__parse_zlib(a, parse_header); > +} > + > +STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen) > +{ > + stbi__zbuf a; > + char *p = (char *) stbi__malloc(initial_size); > + if (p == NULL) return NULL; > + a.zbuffer = (stbi_uc *) buffer; > + a.zbuffer_end = (stbi_uc *) buffer + len; > + if (stbi__do_zlib(&a, p, initial_size, 1, 1)) { > + if (outlen) *outlen = (int) (a.zout - a.zout_start); > + return a.zout_start; > + } else { > + STBI_FREE(a.zout_start); > + return NULL; > + } > +} > + > +STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) > +{ > + return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); > +} > + > +STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header) > +{ > + stbi__zbuf a; > + char *p = (char *) stbi__malloc(initial_size); > + if (p == NULL) return NULL; > + a.zbuffer = (stbi_uc *) buffer; > + a.zbuffer_end = (stbi_uc *) buffer + len; > + if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) { > + if (outlen) *outlen = (int) (a.zout - a.zout_start); > + return a.zout_start; > + } else { > + STBI_FREE(a.zout_start); > + return NULL; > + } > +} > + > +STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) > +{ > + stbi__zbuf a; > + a.zbuffer = (stbi_uc *) ibuffer; > + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; > + if (stbi__do_zlib(&a, obuffer, olen, 0, 1)) > + return (int) (a.zout - a.zout_start); > + else > + return -1; > +} > + > +STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) > +{ > + stbi__zbuf a; > + char *p = (char *) stbi__malloc(16384); > + if (p == NULL) return NULL; > + a.zbuffer = (stbi_uc *) buffer; > + a.zbuffer_end = (stbi_uc *) buffer+len; > + if (stbi__do_zlib(&a, p, 16384, 1, 0)) { > + if (outlen) *outlen = (int) (a.zout - a.zout_start); > + return a.zout_start; > + } else { > + STBI_FREE(a.zout_start); > + return NULL; > + } > +} > + > +STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) > +{ > + stbi__zbuf a; > + a.zbuffer = (stbi_uc *) ibuffer; > + a.zbuffer_end = (stbi_uc *) ibuffer + ilen; > + if (stbi__do_zlib(&a, obuffer, olen, 0, 0)) > + return (int) (a.zout - a.zout_start); > + else > + return -1; > +} > +#endif > + > +// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 > +// simple implementation > +// - only 8-bit samples > +// - no CRC checking > +// - allocates lots of intermediate memory > +// - avoids problem of streaming data between subsystems > +// - avoids explicit window management > +// performance > +// - uses stb_zlib, a PD zlib implementation with fast huffman decoding > + > +#ifndef STBI_NO_PNG > +typedef struct > +{ > + stbi__uint32 length; > + stbi__uint32 type; > +} stbi__pngchunk; > + > +static stbi__pngchunk stbi__get_chunk_header(stbi__context *s) > +{ > + stbi__pngchunk c; > + c.length = stbi__get32be(s); > + c.type = stbi__get32be(s); > + return c; > +} > + > +static int stbi__check_png_header(stbi__context *s) > +{ > + static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 }; > + int i; > + for (i=0; i < 8; ++i) > + if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG"); > + return 1; > +} > + > +typedef struct > +{ > + stbi__context *s; > + stbi_uc *idata, *expanded, *out; > + int depth; > +} stbi__png; > + > + > +enum { > + STBI__F_none=0, > + STBI__F_sub=1, > + STBI__F_up=2, > + STBI__F_avg=3, > + STBI__F_paeth=4, > + // synthetic filters used for first scanline to avoid needing a dummy row of 0s > + STBI__F_avg_first, > + STBI__F_paeth_first > +}; > + > +static stbi_uc first_row_filter[5] = > +{ > + STBI__F_none, > + STBI__F_sub, > + STBI__F_none, > + STBI__F_avg_first, > + STBI__F_paeth_first > +}; > + > +static int stbi__paeth(int a, int b, int c) > +{ > + int p = a + b - c; > + int pa = abs(p-a); > + int pb = abs(p-b); > + int pc = abs(p-c); > + if (pa <= pb && pa <= pc) return a; > + if (pb <= pc) return b; > + return c; > +} > + > +static const stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 }; > + > +// create the png data from post-deflated data > +static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color) > +{ > + int bytes = (depth == 16? 2 : 1); > + stbi__context *s = a->s; > + stbi__uint32 i,j,stride = x*out_n*bytes; > + stbi__uint32 img_len, img_width_bytes; > + int k; > + int img_n = s->img_n; // copy it into a local for later > + > + int output_bytes = out_n*bytes; > + int filter_bytes = img_n*bytes; > + int width = x; > + > + STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1); > + a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into > + if (!a->out) return stbi__err("outofmem", "Out of memory"); > + > + if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG"); > + img_width_bytes = (((img_n * x * depth) + 7) >> 3); > + img_len = (img_width_bytes + 1) * y; > + > + // we used to check for exact match between raw_len and img_len on non-interlaced PNGs, > + // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros), > + // so just check for raw_len < img_len always. > + if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG"); > + > + for (j=0; j < y; ++j) { > + stbi_uc *cur = a->out + stride*j; > + stbi_uc *prior; > + int filter = *raw++; > + > + if (filter > 4) > + return stbi__err("invalid filter","Corrupt PNG"); > + > + if (depth < 8) { > + 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); > + for (p=0; p < 7; ++p) { > + int xorig[] = { 0,4,0,2,0,1,0 }; > + int yorig[] = { 0,0,4,0,2,0,1 }; > + int xspc[] = { 8,8,4,4,2,2,1 }; > + int yspc[] = { 8,8,8,4,4,2,2 }; > + int i,j,x,y; > + // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 > + x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p]; > + y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p]; > + if (x && y) { > + stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y; > + if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) { > + STBI_FREE(final); > + return 0; > + } > + for (j=0; j < y; ++j) { > + for (i=0; i < x; ++i) { > + int out_y = j*yspc[p]+yorig[p]; > + int out_x = i*xspc[p]+xorig[p]; > + memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes, > + a->out + (j*x+i)*out_bytes, out_bytes); > + } > + } > + STBI_FREE(a->out); > + image_data += img_len; > + image_data_len -= img_len; > + } > + } > + a->out = final; > + > + return 1; > +} > + > +static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n) > +{ > + stbi__context *s = z->s; > + stbi__uint32 i, pixel_count = s->img_x * s->img_y; > + stbi_uc *p = z->out; > + > + // compute color-based transparency, assuming we've > + // already got 255 as the alpha value in the output > + STBI_ASSERT(out_n == 2 || out_n == 4); > + > + if (out_n == 2) { > + for (i=0; i < pixel_count; ++i) { > + p[1] = (p[0] == tc[0] ? 0 : 255); > + p += 2; > + } > + } else { > + for (i=0; i < pixel_count; ++i) { > + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) > + p[3] = 0; > + p += 4; > + } > + } > + return 1; > +} > + > +static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n) > +{ > + stbi__context *s = z->s; > + stbi__uint32 i, pixel_count = s->img_x * s->img_y; > + stbi__uint16 *p = (stbi__uint16*) z->out; > + > + // compute color-based transparency, assuming we've > + // already got 65535 as the alpha value in the output > + STBI_ASSERT(out_n == 2 || out_n == 4); > + > + if (out_n == 2) { > + for (i = 0; i < pixel_count; ++i) { > + p[1] = (p[0] == tc[0] ? 0 : 65535); > + p += 2; > + } > + } else { > + for (i = 0; i < pixel_count; ++i) { > + if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) > + p[3] = 0; > + p += 4; > + } > + } > + return 1; > +} > + > +static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n) > +{ > + stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y; > + stbi_uc *p, *temp_out, *orig = a->out; > + > + p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0); > + if (p == NULL) return stbi__err("outofmem", "Out of memory"); > + > + // between here and free(out) below, exitting would leak > + temp_out = p; > + > + if (pal_img_n == 3) { > + for (i=0; i < pixel_count; ++i) { > + int n = orig[i]*4; > + p[0] = palette[n ]; > + p[1] = palette[n+1]; > + p[2] = palette[n+2]; > + p += 3; > + } > + } else { > + for (i=0; i < pixel_count; ++i) { > + int n = orig[i]*4; > + p[0] = palette[n ]; > + p[1] = palette[n+1]; > + p[2] = palette[n+2]; > + p[3] = palette[n+3]; > + p += 4; > + } > + } > + STBI_FREE(a->out); > + a->out = temp_out; > + > + STBI_NOTUSED(len); > + > + return 1; > +} > + > +static int stbi__unpremultiply_on_load = 0; > +static int stbi__de_iphone_flag = 0; > + > +STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) > +{ > + stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply; > +} > + > +STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) > +{ > + stbi__de_iphone_flag = flag_true_if_should_convert; > +} > + > +static void stbi__de_iphone(stbi__png *z) > +{ > + stbi__context *s = z->s; > + stbi__uint32 i, pixel_count = s->img_x * s->img_y; > + stbi_uc *p = z->out; > + > + if (s->img_out_n == 3) { // convert bgr to rgb > + for (i=0; i < pixel_count; ++i) { > + stbi_uc t = p[0]; > + p[0] = p[2]; > + p[2] = t; > + p += 3; > + } > + } else { > + STBI_ASSERT(s->img_out_n == 4); > + if (stbi__unpremultiply_on_load) { > + // convert bgr to rgb and unpremultiply > + for (i=0; i < pixel_count; ++i) { > + stbi_uc a = p[3]; > + stbi_uc t = p[0]; > + if (a) { > + stbi_uc half = a / 2; > + p[0] = (p[2] * 255 + half) / a; > + p[1] = (p[1] * 255 + half) / a; > + p[2] = ( t * 255 + half) / a; > + } else { > + p[0] = p[2]; > + p[2] = t; > + } > + p += 4; > + } > + } else { > + // convert bgr to rgb > + for (i=0; i < pixel_count; ++i) { > + stbi_uc t = p[0]; > + p[0] = p[2]; > + p[2] = t; > + p += 4; > + } > + } > + } > +} > + > +#define STBI__PNG_TYPE(a,b,c,d) (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d)) > + > +static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) > +{ > + stbi_uc palette[1024], pal_img_n=0; > + stbi_uc has_trans=0, tc[3]={0}; > + stbi__uint16 tc16[3]; > + stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0; > + int first=1,k,interlace=0, color=0, is_iphone=0; > + stbi__context *s = z->s; > + > + z->expanded = NULL; > + z->idata = NULL; > + z->out = NULL; > + > + if (!stbi__check_png_header(s)) return 0; > + > + if (scan == STBI__SCAN_type) return 1; > + > + for (;;) { > + stbi__pngchunk c = stbi__get_chunk_header(s); > + switch (c.type) { > + case STBI__PNG_TYPE('C','g','B','I'): > + is_iphone = 1; > + stbi__skip(s, c.length); > + break; > + case STBI__PNG_TYPE('I','H','D','R'): { > + int comp,filter; > + if (!first) return stbi__err("multiple IHDR","Corrupt PNG"); > + first = 0; > + if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG"); > + s->img_x = stbi__get32be(s); > + 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 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"); > + stbi__get32le(s); // discard sizeof > + stbi__get32le(s); // discard hres > + stbi__get32le(s); // discard vres > + stbi__get32le(s); // discard colorsused > + stbi__get32le(s); // discard max important > + if (hsz == 40 || hsz == 56) { > + if (hsz == 56) { > + stbi__get32le(s); > + stbi__get32le(s); > + stbi__get32le(s); > + stbi__get32le(s); > + } > + if (info->bpp == 16 || info->bpp == 32) { > + if (compress == 0) { > + if (info->bpp == 32) { > + info->mr = 0xffu << 16; > + info->mg = 0xffu << 8; > + info->mb = 0xffu << 0; > + info->ma = 0xffu << 24; > + info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0 > + } else { > + info->mr = 31u << 10; > + info->mg = 31u << 5; > + info->mb = 31u << 0; > + } > + } else if (compress == 3) { > + info->mr = stbi__get32le(s); > + info->mg = stbi__get32le(s); > + info->mb = stbi__get32le(s); > + 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 { > + int i; > + if (hsz != 108 && hsz != 124) > + return stbi__errpuc("bad BMP", "bad BMP"); > + info->mr = stbi__get32le(s); > + info->mg = stbi__get32le(s); > + info->mb = stbi__get32le(s); > + info->ma = stbi__get32le(s); > + stbi__get32le(s); // discard color space > + for (i=0; i < 12; ++i) > + stbi__get32le(s); // discard color space parameters > + if (hsz == 124) { > + stbi__get32le(s); // discard rendering intent > + stbi__get32le(s); // discard offset of profile data > + stbi__get32le(s); // discard size of profile data > + stbi__get32le(s); // discard reserved > + } > + } > + } > + return (void *) 1; > +} > + > + > +static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) > +{ > + stbi_uc *out; > + unsigned int mr=0,mg=0,mb=0,ma=0, all_a; > + stbi_uc pal[256][4]; > + int psize=0,i,j,width; > + int flip_vertically, pad, target; > + stbi__bmp_data info; > + STBI_NOTUSED(ri); > + > + info.all_a = 255; > + if (stbi__bmp_parse_header(s, &info) == NULL) > + return NULL; // error code already set > + > + flip_vertically = ((int) s->img_y) > 0; > + s->img_y = abs((int) s->img_y); > + > + 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) { > + STBI_ASSERT(info.offset == s->callback_already_read + (int) (s->img_buffer - s->img_buffer_original)); > + if (info.offset != s->callback_already_read + (s->img_buffer - s->buffer_start)) { > + 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; y + int packet_idx; > + > + for(packet_idx=0; packet_idx < num_packets; ++packet_idx) { > + stbi__pic_packet *packet = &packets[packet_idx]; > + stbi_uc *dest = result+y*width*4; > + > + switch (packet->type) { > + default: > + return stbi__errpuc("bad format","packet has bad compression type"); > + > + case 0: {//uncompressed > + int x; > + > + for(x=0;x + if (!stbi__readval(s,packet->channel,dest)) > + return 0; > + break; > + } > + > + case 1://Pure RLE > + { > + int left=width, i; > + > + while (left>0) { > + stbi_uc count,value[4]; > + > + count=stbi__get8(s); > + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)"); > + > + if (count > left) > + count = (stbi_uc) left; > + > + if (!stbi__readval(s,packet->channel,value)) return 0; > + > + for(i=0; i + stbi__copyval(packet->channel,dest,value); > + left -= count; > + } > + } > + break; > + > + case 2: {//Mixed RLE > + int left=width; > + while (left>0) { > + int count = stbi__get8(s), i; > + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)"); > + > + if (count >= 128) { // Repeated > + stbi_uc value[4]; > + > + if (count==128) > + count = stbi__get16be(s); > + else > + count -= 127; > + if (count > left) > + return stbi__errpuc("bad file","scanline overrun"); > + > + if (!stbi__readval(s,packet->channel,value)) > + return 0; > + > + for(i=0;i + stbi__copyval(packet->channel,dest,value); > + } else { // Raw > + ++count; > + if (count>left) return stbi__errpuc("bad file","scanline overrun"); > + > + for(i=0;i + if (!stbi__readval(s,packet->channel,dest)) > + return 0; > + } > + left-=count; > + } > + break; > + } > + } > + } > + } > + > + return result; > +} > + > +static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri) > +{ > + stbi_uc *result; > + int i, x,y, internal_comp; > + STBI_NOTUSED(ri); > + > + if (!comp) comp = &internal_comp; > + > + for (i=0; i<92; ++i) > + stbi__get8(s); > + > + x = stbi__get16be(s); > + y = stbi__get16be(s); > + > + if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); > + if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)"); > + > + if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)"); > + if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode"); > + > + stbi__get32be(s); //skip `ratio' > + stbi__get16be(s); //skip `fields' > + stbi__get16be(s); //skip `pad' > + > + // intermediate buffer is RGBA > + result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0); > + 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 (!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(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp) > +{ > + if (stbi__gif_test(s)) { > + int layers = 0; > + stbi_uc *u = 0; > + stbi_uc *out = 0; > + stbi_uc *two_back = 0; > + stbi__gif g; > + int stride; > + memset(&g, 0, sizeof(g)); > + if (delays) { > + *delays = 0; > + } > + > + do { > + u = stbi__gif_load_next(s, &g, comp, req_comp, two_back); > + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker > + > + if (u) { > + *x = g.w; > + *y = g.h; > + ++layers; > + stride = g.w * g.h * 4; > + > + if (out) { > + void *tmp = (stbi_uc*) STBI_REALLOC_SIZED( out, 0, layers * stride ); > + if (NULL == tmp) { > + STBI_FREE(g.out); > + STBI_FREE(g.history); > + STBI_FREE(g.background); > + return stbi__errpuc("outofmem", "Out of memory"); > + } > + else { > + out = (stbi_uc*) tmp; > + } > + > + if (delays) { > + *delays = (int*) STBI_REALLOC_SIZED( *delays, 0, sizeof(int) * layers ); > + } > + } else { > + out = (stbi_uc*)stbi__malloc( layers * stride ); > + if (delays) { > + *delays = (int*) stbi__malloc( layers * sizeof(int) ); > + } > + } > + memcpy( out + ((layers - 1) * stride), u, stride ); > + if (layers >= 2) { > + two_back = out - 2 * stride; > + } > + > + if (delays) { > + (*delays)[layers - 1U] = g.delay; > + } > + } > + } while (u != 0); > + > + // free temp buffer; > + STBI_FREE(g.out); > + STBI_FREE(g.history); > + STBI_FREE(g.background); > + > + // do the final conversion after loading everything; > + if (req_comp && req_comp != 4) > + out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h); > + > + *z = layers; > + return out; > + } else { > + return stbi__errpuc("not GIF", "Image was not as a gif type."); > + } > +} > + > +static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) > +{ > + stbi_uc *u = 0; > + stbi__gif g; > + memset(&g, 0, sizeof(g)); > + STBI_NOTUSED(ri); > + > + u = stbi__gif_load_next(s, &g, comp, req_comp, 0); > + if (u == (stbi_uc *) s) u = 0; // end of animated gif marker > + if (u) { > + *x = g.w; > + *y = g.h; > + > + // moved conversion to after successful load so that the same > + // can be done for multiple frames. > + if (req_comp && req_comp != 4) > + u = stbi__convert_format(u, 4, req_comp, g.w, g.h); > + } else if (g.out) { > + // if there was an error and we allocated an image buffer, free it! > + STBI_FREE(g.out); > + } > + > + // free buffers needed for multiple frame loading; > + STBI_FREE(g.history); > + STBI_FREE(g.background); > + > + return u; > +} > + > +static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp) > +{ > + return stbi__gif_info_raw(s,x,y,comp); > +} > +#endif > + > +// ************************************************************************************************* > +// Radiance RGBE HDR loader > +// originally by Nicolas Schulz > +#ifndef STBI_NO_HDR > +static int stbi__hdr_test_core(stbi__context *s, const char *signature) > +{ > + int i; > + for (i=0; signature[i]; ++i) > + if (stbi__get8(s) != signature[i]) > + return 0; > + stbi__rewind(s); > + return 1; > +} > + > +static int stbi__hdr_test(stbi__context* s) > +{ > + int r = stbi__hdr_test_core(s, "#?RADIANCE\n"); > + stbi__rewind(s); > + if(!r) { > + r = stbi__hdr_test_core(s, "#?RGBE\n"); > + stbi__rewind(s); > + } > + return r; > +} > + > +#define STBI__HDR_BUFLEN 1024 > +static char *stbi__hdr_gettoken(stbi__context *z, char *buffer) > +{ > + int len=0; > + char c = '\0'; > + > + c = (char) stbi__get8(z); > + > + while (!stbi__at_eof(z) && c != '\n') { > + buffer[len++] = c; > + if (len == STBI__HDR_BUFLEN-1) { > + // flush to end of line > + while (!stbi__at_eof(z) && stbi__get8(z) != '\n') > + ; > + break; > + } > + c = (char) stbi__get8(z); > + } > + > + buffer[len] = 0; > + return buffer; > +} > + > +static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp) > +{ > + if ( input[3] != 0 ) { > + float f1; > + // Exponent > + f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); > + if (req_comp <= 2) > + output[0] = (input[0] + input[1] + input[2]) * f1 / 3; > + else { > + output[0] = input[0] * f1; > + output[1] = input[1] * f1; > + output[2] = input[2] * f1; > + } > + if (req_comp == 2) output[1] = 1; > + if (req_comp == 4) output[3] = 1; > + } else { > + switch (req_comp) { > + case 4: output[3] = 1; /* fallthrough */ > + case 3: output[0] = output[1] = output[2] = 0; > + break; > + case 2: output[1] = 1; /* fallthrough */ > + case 1: output[0] = 0; > + break; > + } > + } > +} > + > +static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) > +{ > + char buffer[STBI__HDR_BUFLEN]; > + char *token; > + int valid = 0; > + int width, height; > + stbi_uc *scanline; > + float *hdr_data; > + int len; > + unsigned char count, value; > + int i, j, k, c1,c2, z; > + const char *headerToken; > + STBI_NOTUSED(ri); > + > + // Check identifier > + headerToken = stbi__hdr_gettoken(s,buffer); > + if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0) > + return stbi__errpf("not HDR", "Corrupt HDR image"); > + > + // Parse header > + for(;;) { > + token = stbi__hdr_gettoken(s,buffer); > + if (token[0] == 0) break; > + if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1; > + } > + > + if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format"); > + > + // Parse width and height > + // can't use sscanf() if we're not using stdio! > + token = stbi__hdr_gettoken(s,buffer); > + if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); > + token += 3; > + height = (int) strtol(token, &token, 10); > + while (*token == ' ') ++token; > + if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format"); > + token += 3; > + width = (int) strtol(token, NULL, 10); > + > + 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); > + stbi__rewind( s ); > + if (p == NULL) > + return 0; > + if (x) *x = s->img_x; > + if (y) *y = s->img_y; > + if (comp) { > + if (info.bpp == 24 && info.ma == 0xff000000) > + *comp = 3; > + else > + *comp = info.ma ? 4 : 3; > + } > + return 1; > +} > +#endif > + > +#ifndef STBI_NO_PSD > +static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) > +{ > + int channelCount, dummy, depth; > + if (!x) x = &dummy; > + if (!y) y = &dummy; > + if (!comp) comp = &dummy; > + if (stbi__get32be(s) != 0x38425053) { > + stbi__rewind( s ); > + return 0; > + } > + if (stbi__get16be(s) != 1) { > + stbi__rewind( s ); > + return 0; > + } > + stbi__skip(s, 6); > + channelCount = stbi__get16be(s); > + if (channelCount < 0 || channelCount > 16) { > + stbi__rewind( s ); > + return 0; > + } > + *y = stbi__get32be(s); > + *x = stbi__get32be(s); > + depth = stbi__get16be(s); > + if (depth != 8 && depth != 16) { > + stbi__rewind( s ); > + return 0; > + } > + if (stbi__get16be(s) != 3) { > + stbi__rewind( s ); > + return 0; > + } > + *comp = 4; > + return 1; > +} > + > +static int stbi__psd_is16(stbi__context *s) > +{ > + int channelCount, depth; > + if (stbi__get32be(s) != 0x38425053) { > + stbi__rewind( s ); > + return 0; > + } > + if (stbi__get16be(s) != 1) { > + stbi__rewind( s ); > + return 0; > + } > + stbi__skip(s, 6); > + channelCount = stbi__get16be(s); > + if (channelCount < 0 || channelCount > 16) { > + stbi__rewind( s ); > + return 0; > + } > + (void) stbi__get32be(s); > + (void) stbi__get32be(s); > + depth = stbi__get16be(s); > + if (depth != 16) { > + stbi__rewind( s ); > + return 0; > + } > + return 1; > +} > +#endif > + > +#ifndef STBI_NO_PIC > +static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) > +{ > + int act_comp=0,num_packets=0,chained,dummy; > + stbi__pic_packet packets[10]; > + > + if (!x) x = &dummy; > + if (!y) y = &dummy; > + if (!comp) comp = &dummy; > + > + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { > + stbi__rewind(s); > + return 0; > + } > + > + stbi__skip(s, 88); > + > + *x = stbi__get16be(s); > + *y = stbi__get16be(s); > + if (stbi__at_eof(s)) { > + stbi__rewind( s); > + return 0; > + } > + if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) { > + stbi__rewind( s ); > + return 0; > + } > + > + stbi__skip(s, 8); > + > + do { > + stbi__pic_packet *packet; > + > + if (num_packets==sizeof(packets)/sizeof(packets[0])) > + return 0; > + > + packet = &packets[num_packets++]; > + chained = stbi__get8(s); > + packet->size = stbi__get8(s); > + packet->type = stbi__get8(s); > + packet->channel = stbi__get8(s); > + act_comp |= packet->channel; > + > + if (stbi__at_eof(s)) { > + stbi__rewind( s ); > + return 0; > + } > + if (packet->size != 8) { > + stbi__rewind( s ); > + return 0; > + } > + } while (chained); > + > + *comp = (act_comp & 0x10 ? 4 : 3); > + > + return 1; > +} > +#endif > + > +// ************************************************************************************************* > +// Portable Gray Map and Portable Pixel Map loader > +// by Ken Miller > +// > +// PGM: http://netpbm.sourceforge.net/doc/pgm.html > +// PPM: http://netpbm.sourceforge.net/doc/ppm.html > +// > +// Known limitations: > +// Does not support comments in the header section > +// Does not support ASCII image data (formats P2 and P3) > +// Does not support 16-bit-per-channel > + > +#ifndef STBI_NO_PNM > + > +static int stbi__pnm_test(stbi__context *s) > +{ > + char p, t; > + p = (char) stbi__get8(s); > + t = (char) stbi__get8(s); > + if (p != 'P' || (t != '5' && t != '6')) { > + stbi__rewind( s ); > + return 0; > + } > + return 1; > +} > + > +static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri) > +{ > + stbi_uc *out; > + STBI_NOTUSED(ri); > + > + if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n)) > + return 0; > + > + 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__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0)) > + return stbi__errpuc("too large", "PNM too large"); > + > + out = (stbi_uc *) stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0); > + if (!out) return stbi__errpuc("outofmem", "Out of memory"); > + stbi__getn(s, out, s->img_n * s->img_x * s->img_y); > + > + if (req_comp && req_comp != s->img_n) { > + out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y); > + if (out == NULL) return out; // stbi__convert_format frees input on failure > + } > + return out; > +} > + > +static int stbi__pnm_isspace(char c) > +{ > + return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r'; > +} > + > +static void stbi__pnm_skip_whitespace(stbi__context *s, char *c) > +{ > + for (;;) { > + while (!stbi__at_eof(s) && stbi__pnm_isspace(*c)) > + *c = (char) stbi__get8(s); > + > + if (stbi__at_eof(s) || *c != '#') > + break; > + > + while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' ) > + *c = (char) stbi__get8(s); > + } > +} > + > +static int stbi__pnm_isdigit(char c) > +{ > + return c >= '0' && c <= '9'; > +} > + > +static int stbi__pnm_getinteger(stbi__context *s, char *c) > +{ > + int value = 0; > + > + while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) { > + value = value*10 + (*c - '0'); > + *c = (char) stbi__get8(s); > + } > + > + return value; > +} > + > +static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) > +{ > + int maxv, dummy; > + char c, p, t; > + > + if (!x) x = &dummy; > + if (!y) y = &dummy; > + if (!comp) comp = &dummy; > + > + stbi__rewind(s); > + > + // Get identifier > + p = (char) stbi__get8(s); > + t = (char) stbi__get8(s); > + if (p != 'P' || (t != '5' && t != '6')) { > + stbi__rewind(s); > + return 0; > + } > + > + *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm > + > + c = (char) stbi__get8(s); > + stbi__pnm_skip_whitespace(s, &c); > + > + *x = stbi__pnm_getinteger(s, &c); // read width > + stbi__pnm_skip_whitespace(s, &c); > + > + *y = stbi__pnm_getinteger(s, &c); // read height > + stbi__pnm_skip_whitespace(s, &c); > + > + maxv = stbi__pnm_getinteger(s, &c); // read max value > + > + if (maxv > 255) > + return stbi__err("max value > 255", "PPM image not 8-bit"); > + else > + return 1; > +} > +#endif > + > +static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp) > +{ > + #ifndef STBI_NO_JPEG > + if (stbi__jpeg_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_PNG > + if (stbi__png_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_GIF > + if (stbi__gif_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_BMP > + if (stbi__bmp_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_PSD > + if (stbi__psd_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_PIC > + if (stbi__pic_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_PNM > + if (stbi__pnm_info(s, x, y, comp)) return 1; > + #endif > + > + #ifndef STBI_NO_HDR > + if (stbi__hdr_info(s, x, y, comp)) return 1; > + #endif > + > + // test tga last because it's a crappy test! > + #ifndef STBI_NO_TGA > + if (stbi__tga_info(s, x, y, comp)) > + return 1; > + #endif > + return stbi__err("unknown image type", "Image not of any known type, or corrupt"); > +} > + > +static int stbi__is_16_main(stbi__context *s) > +{ > + #ifndef STBI_NO_PNG > + if (stbi__png_is16(s)) return 1; > + #endif > + > + #ifndef STBI_NO_PSD > + if (stbi__psd_is16(s)) return 1; > + #endif > + > + return 0; > +} > + > +#ifndef STBI_NO_STDIO > +STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp) > +{ > + FILE *f = stbi__fopen(filename, "rb"); > + int result; > + if (!f) return stbi__err("can't fopen", "Unable to open file"); > + result = stbi_info_from_file(f, x, y, comp); > + fclose(f); > + return result; > +} > + > +STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) > +{ > + int r; > + stbi__context s; > + long pos = ftell(f); > + stbi__start_file(&s, f); > + r = stbi__info_main(&s,x,y,comp); > + fseek(f,pos,SEEK_SET); > + return r; > +} > + > +STBIDEF int stbi_is_16_bit(char const *filename) > +{ > + FILE *f = stbi__fopen(filename, "rb"); > + int result; > + if (!f) return stbi__err("can't fopen", "Unable to open file"); > + result = stbi_is_16_bit_from_file(f); > + fclose(f); > + return result; > +} > + > +STBIDEF int stbi_is_16_bit_from_file(FILE *f) > +{ > + int r; > + stbi__context s; > + long pos = ftell(f); > + stbi__start_file(&s, f); > + r = stbi__is_16_main(&s); > + fseek(f,pos,SEEK_SET); > + return r; > +} > +#endif // !STBI_NO_STDIO > + > +STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) > +{ > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + return stbi__info_main(&s,x,y,comp); > +} > + > +STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp) > +{ > + stbi__context s; > + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); > + return stbi__info_main(&s,x,y,comp); > +} > + > +STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len) > +{ > + stbi__context s; > + stbi__start_mem(&s,buffer,len); > + return stbi__is_16_main(&s); > +} > + > +STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user) > +{ > + stbi__context s; > + stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user); > + return stbi__is_16_main(&s); > +} > + > +#endif // STB_IMAGE_IMPLEMENTATION > + > +/* > + revision history: > + 2.20 (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs > + 2.19 (2018-02-11) fix warning > + 2.18 (2018-01-30) fix warnings > + 2.17 (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug > + 1-bit BMP > + *_is_16_bit api > + avoid warnings > + 2.16 (2017-07-23) all functions have 16-bit variants; > + STBI_NO_STDIO works again; > + compilation fixes; > + fix rounding in unpremultiply; > + optimize vertical flip; > + disable raw_len validation; > + documentation fixes > + 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode; > + warning fixes; disable run-time SSE detection on gcc; > + uniform handling of optional "return" values; > + thread-safe initialization of zlib tables > + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs > + 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now > + 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes > + 2.11 (2016-04-02) allocate large structures on the stack > + remove white matting for transparent PSD > + fix reported channel count for PNG & BMP > + re-enable SSE2 in non-gcc 64-bit > + support RGB-formatted JPEG > + read 16-bit PNGs (only as 8-bit) > + 2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED > + 2.09 (2016-01-16) allow comments in PNM files > + 16-bit-per-pixel TGA (not bit-per-component) > + info() for TGA could break due to .hdr handling > + info() for BMP to shares code instead of sloppy parse > + can use STBI_REALLOC_SIZED if allocator doesn't support realloc > + code cleanup > + 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA > + 2.07 (2015-09-13) fix compiler warnings > + partial animated GIF support > + limited 16-bpc PSD support > + #ifdef unused functions > + bug with < 92 byte PIC,PNM,HDR,TGA > + 2.06 (2015-04-19) fix bug where PSD returns wrong '*comp' value > + 2.05 (2015-04-19) fix bug in progressive JPEG handling, fix warning > + 2.04 (2015-04-15) try to re-enable SIMD on MinGW 64-bit > + 2.03 (2015-04-12) extra corruption checking (mmozeiko) > + stbi_set_flip_vertically_on_load (nguillemot) > + fix NEON support; fix mingw support > + 2.02 (2015-01-19) fix incorrect assert, fix warning > + 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2 > + 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG > + 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) > + progressive JPEG (stb) > + PGM/PPM support (Ken Miller) > + STBI_MALLOC,STBI_REALLOC,STBI_FREE > + GIF bugfix -- seemingly never worked > + STBI_NO_*, STBI_ONLY_* > + 1.48 (2014-12-14) fix incorrectly-named assert() > + 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb) > + optimize PNG (ryg) > + fix bug in interlaced PNG with user-specified channel count (stb) > + 1.46 (2014-08-26) > + fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG > + 1.45 (2014-08-16) > + fix MSVC-ARM internal compiler error by wrapping malloc > + 1.44 (2014-08-07) > + various warning fixes from Ronny Chevalier > + 1.43 (2014-07-15) > + fix MSVC-only compiler problem in code changed in 1.42 > + 1.42 (2014-07-09) > + don't define _CRT_SECURE_NO_WARNINGS (affects user code) > + fixes to stbi__cleanup_jpeg path > + added STBI_ASSERT to avoid requiring assert.h > + 1.41 (2014-06-25) > + fix search&replace from 1.36 that messed up comments/error messages > + 1.40 (2014-06-22) > + fix gcc struct-initialization warning > + 1.39 (2014-06-15) > + fix to TGA optimization when req_comp != number of components in TGA; > + fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite) > + add support for BMP version 5 (more ignored fields) > + 1.38 (2014-06-06) > + suppress MSVC warnings on integer casts truncating values > + fix accidental rename of 'skip' field of I/O > + 1.37 (2014-06-04) > + remove duplicate typedef > + 1.36 (2014-06-03) > + convert to header file single-file library > + if de-iphone isn't set, load iphone images color-swapped instead of returning NULL > + 1.35 (2014-05-27) > + various warnings > + fix broken STBI_SIMD path > + fix bug where stbi_load_from_file no longer left file pointer in correct place > + fix broken non-easy path for 32-bit BMP (possibly never used) > + TGA optimization by Arseny Kapoulkine > + 1.34 (unknown) > + use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case > + 1.33 (2011-07-14) > + make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements > + 1.32 (2011-07-13) > + support for "info" function for all supported filetypes (SpartanJ) > + 1.31 (2011-06-20) > + a few more leak fixes, bug in PNG handling (SpartanJ) > + 1.30 (2011-06-11) > + added ability to load files via callbacks to accomidate custom input streams (Ben Wenger) > + removed deprecated format-specific test/load functions > + removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway > + error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha) > + fix inefficiency in decoding 32-bit BMP (David Woo) > + 1.29 (2010-08-16) > + various warning fixes from Aurelien Pocheville > + 1.28 (2010-08-01) > + fix bug in GIF palette transparency (SpartanJ) > + 1.27 (2010-08-01) > + cast-to-stbi_uc to fix warnings > + 1.26 (2010-07-24) > + fix bug in file buffering for PNG reported by SpartanJ > + 1.25 (2010-07-17) > + refix trans_data warning (Won Chun) > + 1.24 (2010-07-12) > + perf improvements reading from files on platforms with lock-heavy fgetc() > + minor perf improvements for jpeg > + deprecated type-specific functions so we'll get feedback if they're needed > + attempt to fix trans_data warning (Won Chun) > + 1.23 fixed bug in iPhone support > + 1.22 (2010-07-10) > + removed image *writing* support > + stbi_info support from Jetro Lauha > + GIF support from Jean-Marc Lienher > + iPhone PNG-extensions from James Brown > + warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva) > + 1.21 fix use of 'stbi_uc' in header (reported by jon blow) > + 1.20 added support for Softimage PIC, by Tom Seddon > + 1.19 bug in interlaced PNG corruption check (found by ryg) > + 1.18 (2008-08-02) > + fix a threading bug (local mutable static) > + 1.17 support interlaced PNG > + 1.16 major bugfix - stbi__convert_format converted one too many pixels > + 1.15 initialize some fields for thread safety > + 1.14 fix threadsafe conversion bug > + header-file-only version (#define STBI_HEADER_FILE_ONLY before including) > + 1.13 threadsafe > + 1.12 const qualifiers in the API > + 1.11 Support installable IDCT, colorspace conversion routines > + 1.10 Fixes for 64-bit (don't use "unsigned long") > + optimized upsampling by Fabian "ryg" Giesen > + 1.09 Fix format-conversion for PSD code (bad global variables!) > + 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz > + 1.07 attempt to fix C++ warning/errors again > + 1.06 attempt to fix C++ warning/errors again > + 1.05 fix TGA loading to return correct *comp and use good luminance calc > + 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free > + 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR > + 1.02 support for (subset of) HDR files, float interface for preferred access to them > + 1.01 fix bug: possible bug in handling right-side up bmps... not sure > + fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all > + 1.00 interface to zlib that skips zlib header > + 0.99 correct handling of alpha in palette > + 0.98 TGA loader by lonesock; dynamically add loaders (untested) > + 0.97 jpeg errors on too large a file; also catch another malloc failure > + 0.96 fix detection of invalid v value - particleman@mollyrocket forum > + 0.95 during header scan, seek to markers in case of padding > + 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same > + 0.93 handle jpegtran output; verbose errors > + 0.92 read 4,8,16,24,32-bit BMP files of several formats > + 0.91 output 24-bit Windows 3.0 BMP files > + 0.90 fix a few more warnings; bump version number to approach 1.0 > + 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd > + 0.60 fix compiling as c++ > + 0.59 fix warnings: merge Dave Moore's -Wall fixes > + 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian > + 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available > + 0.56 fix bug: zlib uncompressed mode len vs. nlen > + 0.55 fix bug: restart_interval not initialized to 0 > + 0.54 allow NULL for 'int *comp' > + 0.53 fix bug in png 3->4; speedup png decoding > + 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments > + 0.51 obey req_comp requests, 1-component jpegs return as 1-component, > + on 'test' only check type, not whether we support this variant > + 0.50 (2006-11-19) > + first released version > +*/ > + > + > +/* > +------------------------------------------------------------------------------ > +This software is available under 2 licenses -- choose whichever you prefer. > +------------------------------------------------------------------------------ > +ALTERNATIVE A - MIT License > +Copyright (c) 2017 Sean Barrett > +Permission is hereby granted, free of charge, to any person obtaining a copy of > +this software and associated documentation files (the "Software"), to deal in > +the Software without restriction, including without limitation the rights to > +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies > +of the Software, and to permit persons to whom the Software is furnished to do > +so, subject to the following conditions: > +The above copyright notice and this permission notice shall be included in all > +copies or substantial portions of the Software. > +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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. > +------------------------------------------------------------------------------ > +*/ > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox