prymula/com: DPF-Prymula-audioplugins/dpf/dgl/src/nanovg/stb

comparison DPF-Prymula-audioplugins/dpf/dgl/src/nanovg/stb_image.h @ 3:84e66ea83026

DPF-Prymula-audioplugins-0.231015-2

author	prymula <prymula76@outlook.com>
date	Mon, 16 Oct 2023 21:53:34 +0200
parents
children

comparison

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-:cf2cb71d31dd
+:84e66ea83026
+/* stb_image - v2.10 - public domain image loader - http://nothings.org/stb_image.h
+no warranty implied; use at your own risk
+Do this:
+#define STB_IMAGE_IMPLEMENTATION
+before you include this file in *one* C or C++ file to create the implementation.
+// i.e. it should look like this:
+#include ...
+#include ...
+#include ...
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
+QUICK NOTES:
+Primarily of interest to game developers and other people who can
+avoid problematic images and only need the trivial interface
+JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
+PNG 1/2/4/8-bit-per-channel (16 bpc not supported)
+TGA (not sure what subset, if a subset)
+BMP non-1bpp, non-RLE
+PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+GIF (*comp always reports as 4-channel)
+HDR (radiance rgbE format)
+PIC (Softimage PIC)
+PNM (PPM and PGM binary only)
+Animated GIF still needs a proper API, but here's one way to do it:
+http://gist.github.com/urraka/685d9a6340b26b830d49
+- decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+- decode from arbitrary I/O callbacks
+- SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+Full documentation under "DOCUMENTATION" below.
+Revision 2.00 release notes:
+- Progressive JPEG is now supported.
+- PPM and PGM binary formats are now supported, thanks to Ken Miller.
+- x86 platforms now make use of SSE2 SIMD instructions for
+JPEG decoding, and ARM platforms can use NEON SIMD if requested.
+This work was done by Fabian "ryg" Giesen. SSE2 is used by
+default, but NEON must be enabled explicitly; see docs.
+With other JPEG optimizations included in this version, we see
+2x speedup on a JPEG on an x86 machine, and a 1.5x speedup
+on a JPEG on an ARM machine, relative to previous versions of this
+library. The same results will not obtain for all JPGs and for all
+x86/ARM machines. (Note that progressive JPEGs are significantly
+slower to decode than regular JPEGs.) This doesn't mean that this
+is the fastest JPEG decoder in the land; rather, it brings it
+closer to parity with standard libraries. If you want the fastest
+decode, look elsewhere. (See "Philosophy" section of docs below.)
+See final bullet items below for more info on SIMD.
+- Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing
+the memory allocator. Unlike other STBI libraries, these macros don't
+support a context parameter, so if you need to pass a context in to
+the allocator, you'll have to store it in a global or a thread-local
+variable.
+- Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and
+STBI_NO_LINEAR.
+STBI_NO_HDR:     suppress implementation of .hdr reader format
+STBI_NO_LINEAR:  suppress high-dynamic-range light-linear float API
+- You can suppress implementation of any of the decoders to reduce
+your code footprint by #defining one or more of the following
+symbols before creating the implementation.
+STBI_NO_JPEG
+STBI_NO_PNG
+STBI_NO_BMP
+STBI_NO_PSD
+STBI_NO_TGA
+STBI_NO_GIF
+STBI_NO_HDR
+STBI_NO_PIC
+STBI_NO_PNM   (.ppm and .pgm)
+- You can request *only* certain decoders and suppress all other ones
+(this will be more forward-compatible, as addition of new decoders
+doesn't require you to disable them explicitly):
+STBI_ONLY_JPEG
+STBI_ONLY_PNG
+STBI_ONLY_BMP
+STBI_ONLY_PSD
+STBI_ONLY_TGA
+STBI_ONLY_GIF
+STBI_ONLY_HDR
+STBI_ONLY_PIC
+STBI_ONLY_PNM   (.ppm and .pgm)
+Note that you can define multiples of these, and you will get all
+of them ("only x" and "only y" is interpreted to mean "only x&y").
+- If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+- Compilation of all SIMD code can be suppressed with
+#define STBI_NO_SIMD
+It should not be necessary to disable SIMD unless you have issues
+compiling (e.g. using an x86 compiler which doesn't support SSE
+intrinsics or that doesn't support the method used to detect
+SSE2 support at run-time), and even those can be reported as
+bugs so I can refine the built-in compile-time checking to be
+smarter.
+- The old STBI_SIMD system which allowed installing a user-defined
+IDCT etc. has been removed. If you need this, don't upgrade. My
+assumption is that almost nobody was doing this, and those who
+were will find the built-in SIMD more satisfactory anyway.
+- RGB values computed for JPEG images are slightly different from
+previous versions of stb_image. (This is due to using less
+integer precision in SIMD.) The C code has been adjusted so
+that the same RGB values will be computed regardless of whether
+SIMD support is available, so your app should always produce
+consistent results. But these results are slightly different from
+previous versions. (Specifically, about 3% of available YCbCr values
+will compute different RGB results from pre-1.49 versions by +-1;
+most of the deviating values are one smaller in the G channel.)
+- If you must produce consistent results with previous versions of
+stb_image, #define STBI_JPEG_OLD and you will get the same results
+you used to; however, you will not get the SIMD speedups for
+the YCbCr-to-RGB conversion step (although you should still see
+significant JPEG speedup from the other changes).
+Please note that STBI_JPEG_OLD is a temporary feature; it will be
+removed in future versions of the library. It is only intended for
+near-term back-compatibility use.
+Latest revision history:
+2.10  (2016-01-22) avoid warning introduced in 2.09
+2.09  (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+2.08  (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+2.07  (2015-09-13) partial animated GIF support
+limited 16-bit PSD support
+minor bugs, code cleanup, and compiler warnings
+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) additional corruption checking
+stbi_set_flip_vertically_on_load
+fix NEON support; fix mingw support
+2.02  (2015-01-19) fix incorrect assert, fix warning
+2.01  (2015-01-17) fix various warnings
+2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+2.00  (2014-12-25) optimize JPEG, including x86 SSE2 & ARM NEON SIMD
+progressive JPEG
+PGM/PPM support
+STBI_MALLOC,STBI_REALLOC,STBI_FREE
+STBI_NO_*, STBI_ONLY_*
+GIF bugfix
+1.48  (2014-12-14) fix incorrectly-named assert()
+1.47  (2014-12-14) 1/2/4-bit PNG support (both grayscale and paletted)
+optimize PNG
+fix bug in interlaced PNG with user-specified channel count
+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)
+urraka@github (animated gif)           Junggon Kim (PNM comments)
+Daniel Gibson (16-bit TGA)
+Optimizations & bugfixes
+Fabian "ryg" Giesen
+Arseny Kapoulkine
+Bug & warning fixes
+Marc LeBlanc            David Woo          Guillaume George   Martins Mozeiko
+Christpher Lloyd        Martin Golini      Jerry Jansson      Joseph Thomson
+Dave Moore              Roy Eltham         Hayaki Saito       Phil Jordan
+Won Chun                Luke Graham        Johan Duparc       Nathan Reed
+the Horde3D community   Thomas Ruf         Ronny Chevalier    Nick Verigakis
+Janez Zemva             John Bartholomew   Michal Cichon      svdijk@github
+Jonathan Blow           Ken Hamada         Tero Hanninen      Baldur Karlsson
+Laurent Gomila          Cort Stratton      Sergio Gonzalez    romigrou@github
+Aruelien Pocheville     Thibault Reuille   Cass Everitt
+Ryamond Barbiero        Paul Du Bois       Engin Manap
+Blazej Dariusz Roszkowski
+Michaelangel007@github
+LICENSE
+This software is in the public domain. Where that dedication is not
+recognized, you are granted a perpetual, irrevocable license to copy,
+distribute, and modify this file as you see fit.
+*/
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+// DOCUMENTATION
+//
+// Limitations:
+//    - no 16-bit-per-channel PNG
+//    - no 12-bit-per-channel JPEG
+//    - no JPEGs with arithmetic coding
+//    - no 1-bit BMP
+//    - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+//    int x,y,n;
+//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+//    // ... process data if not NULL ...
+//    // ... x = width, y = height, n = # 8-bit components per pixel ...
+//    // ... replace '0' with '1'..'4' to force that many components per pixel
+//    // ... but 'n' will always be the number that it would have been if you said 0
+//    stbi_image_free(data)
+//
+// Standard parameters:
+//    int *x       -- outputs image width in pixels
+//    int *y       -- outputs image height in pixels
+//    int *comp    -- outputs # of image components in image file
+//    int req_comp -- if non-zero, # of image components requested in result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
+// If req_comp is non-zero, *comp has the number of components that _would_
+// have been output otherwise. E.g. if you set req_comp to 4, you will always
+// get RGBA output, but you can check *comp to see if it's trivially opaque
+// because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+//     N=#comp     components
+//       1           grey
+//       2           grey, alpha
+//       3           red, green, blue
+//       4           red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
+// can be queried for an extremely brief, end-user unfriendly explanation
+// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
+// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
+// more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+//    1. easy to use
+//    2. easy to maintain
+//    3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to maintain",
+// and for best performance I may provide less-easy-to-use APIs that give higher
+// performance, in addition to the easy to use ones. Nevertheless, it's important
+// to keep in mind that from the standpoint of you, a client of this library,
+// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// make more explicit reasons why performance can't be emphasized.
+//
+//    - Portable ("ease of use")
+//    - Small footprint ("easy to maintain")
+//    - No dependencies ("ease of use")
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// The output of the JPEG decoder is slightly different from versions where
+// SIMD support was introduced (that is, for versions before 1.49). The
+// difference is only +-1 in the 8-bit RGB channels, and only on a small
+// fraction of pixels. You can force the pre-1.49 behavior by defining
+// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path
+// and hence cost some performance.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support   (disable by defining STBI_NO_HDR)
+//
+// stb_image now supports loading HDR images in general, and currently
+// the Radiance .HDR file format, although the support is provided
+// generically. You can still load any file through the existing interface;
+// if you attempt to load an HDR file, it will be automatically remapped to
+// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
+// both of these constants can be reconfigured through this interface:
+//
+//     stbi_hdr_to_ldr_gamma(2.2f);
+//     stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+//     stbi_ldr_to_hdr_scale(1.0f);
+//     stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+//     stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB, even though
+// they are internally encoded differently. You can disable this conversion
+// by by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through (which
+// is BGR stored in RGB).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+#define STBI_VERSION 1
+enum
+{
+STBI_default = 0, // only used for req_comp
+STBI_grey       = 1,
+STBI_grey_alpha = 2,
+STBI_rgb        = 3,
+STBI_rgb_alpha  = 4
+};
+typedef unsigned char stbi_uc;
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+//
+// load image by filename, open file, or memory buffer
+//
+typedef struct
+{
+int      (*read)  (void *user,char *data,int size);   // fill 'data' with 'size' bytes.  return number of bytes actually read
+void     (*skip)  (void *user,int n);                 // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
+int      (*eof)   (void *user);                       // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+STBIDEF stbi_uc *stbi_load               (char              const *filename,           int *x, int *y, int *comp, int req_comp);
+STBIDEF stbi_uc *stbi_load_from_memory   (stbi_uc           const *buffer, int len   , int *x, int *y, int *comp, int 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);
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load_from_file  (FILE *f,                  int *x, int *y, int *comp, int req_comp);
+// for stbi_load_from_file, file pointer is left pointing immediately after image
+#endif
+#ifndef STBI_NO_LINEAR
+STBIDEF float *stbi_loadf                 (char const *filename,           int *x, int *y, int *comp, int req_comp);
+STBIDEF float *stbi_loadf_from_memory     (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+STBIDEF float *stbi_loadf_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf_from_file  (FILE *f,                int *x, int *y, int *comp, int req_comp);
+#endif
+#endif
+#ifndef STBI_NO_HDR
+STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma);
+STBIDEF void   stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+#ifndef STBI_NO_LINEAR
+STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma);
+STBIDEF void   stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int    stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+STBIDEF int    stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename);
+STBIDEF int      stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+// get a VERY brief reason for failure
+// NOT THREADSAFE
+STBIDEF const char *stbi_failure_reason  (void);
+// free the loaded image -- this is just free()
+STBIDEF void     stbi_image_free      (void *retval_from_stbi_load);
+// get image dimensions & components without fully decoding
+STBIDEF int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_info            (char const *filename,     int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_file  (FILE *f,                  int *x, int *y, int *comp);
+#endif
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+// flip the image vertically, so the first pixel in the output array is the bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+// ZLIB client - used by PNG, available for other purposes
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+#ifdef __cplusplus
+}
+#endif
+//
+//
+////   end header file   /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+#ifdef STB_IMAGE_IMPLEMENTATION
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
+|| defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
+|| defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
+|| defined(STBI_ONLY_ZLIB)
+#ifndef STBI_ONLY_JPEG
+#define STBI_NO_JPEG
+#endif
+#ifndef STBI_ONLY_PNG
+#define STBI_NO_PNG
+#endif
+#ifndef STBI_ONLY_BMP
+#define STBI_NO_BMP
+#endif
+#ifndef STBI_ONLY_PSD
+#define STBI_NO_PSD
+#endif
+#ifndef STBI_ONLY_TGA
+#define STBI_NO_TGA
+#endif
+#ifndef STBI_ONLY_GIF
+#define STBI_NO_GIF
+#endif
+#ifndef STBI_ONLY_HDR
+#define STBI_NO_HDR
+#endif
+#ifndef STBI_ONLY_PIC
+#define STBI_NO_PIC
+#endif
+#ifndef STBI_ONLY_PNM
+#define STBI_NO_PNM
+#endif
+#endif
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h>  // ldexp
+#endif
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+#ifndef _MSC_VER
+#ifdef __cplusplus
+#define stbi_inline inline
+#else
+#define stbi_inline
+#endif
+#else
+#define stbi_inline __forceinline
+#endif
+#ifdef _MSC_VER
+typedef unsigned short stbi__uint16;
+typedef   signed short stbi__int16;
+typedef unsigned int   stbi__uint32;
+typedef   signed int   stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t  stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t  stbi__int32;
+#endif
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v)  (void)(v)
+#else
+#define STBI_NOTUSED(v)  (void)sizeof(v)
+#endif
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+#ifdef STBI_HAS_LROTL
+#define stbi_lrot(x,y)  _lrotl(x,y)
+#else
+#define stbi_lrot(x,y)  (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz)           malloc(sz)
+#define STBI_REALLOC(p,newsz)     realloc(p,newsz)
+#define STBI_FREE(p)              free(p)
+#endif
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
+#endif
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// NOTE: not clear do we actually need this for the 64-bit path?
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// (but compiling with -msse2 allows the compiler to use SSE2 everywhere;
+// this is just broken and gcc are jerks for not fixing it properly
+// http://www.virtualdub.org/blog/pivot/entry.php?id=363 )
+#define STBI_NO_SIMD
+#endif
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+#if !defined(STBI_NO_SIMD) && defined(STBI__X86_TARGET)
+#define STBI_SSE2
+#include <emmintrin.h>
+#ifdef _MSC_VER
+#if _MSC_VER >= 1400  // not VC6
+#include <intrin.h> // __cpuid
+static int stbi__cpuid3(void)
+{
+int info[4];
+__cpuid(info,1);
+return info[3];
+}
+#else
+static int stbi__cpuid3(void)
+{
+int res;
+__asm {
+mov  eax,1
+cpuid
+mov  res,edx
+}
+return res;
+}
+#endif
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+static int stbi__sse2_available()
+{
+int info3 = stbi__cpuid3();
+return ((info3 >> 26) & 1) != 0;
+}
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+static int stbi__sse2_available()
+{
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later
+// GCC 4.8+ has a nice way to do this
+return __builtin_cpu_supports("sse2");
+#else
+// portable way to do this, preferably without using GCC inline ASM?
+// just bail for now.
+return 0;
+#endif
+}
+#endif
+#endif
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+#ifdef STBI_NEON
+#include <arm_neon.h>
+// assume GCC or Clang on ARM targets
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+///////////////////////////////////////////////
+//
+//  stbi__context struct and start_xxx functions
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct
+{
+stbi__uint32 img_x, img_y;
+int img_n, img_out_n;
+stbi_io_callbacks io;
+void *io_user_data;
+int read_from_callbacks;
+int buflen;
+stbi_uc buffer_start[128];
+stbi_uc *img_buffer, *img_buffer_end;
+stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+static void stbi__refill_buffer(stbi__context *s);
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
+{
+s->io.read = NULL;
+s->read_from_callbacks = 0;
+s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
+s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
+}
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
+{
+s->io = *c;
+s->io_user_data = user;
+s->buflen = sizeof(s->buffer_start);
+s->read_from_callbacks = 1;
+s->img_buffer_original = s->buffer_start;
+stbi__refill_buffer(s);
+s->img_buffer_original_end = s->img_buffer_end;
+}
+#ifndef STBI_NO_STDIO
+static int stbi__stdio_read(void *user, char *data, int size)
+{
+return (int) fread(data,1,size,(FILE*) user);
+}
+static void stbi__stdio_skip(void *user, int n)
+{
+fseek((FILE*) user, n, SEEK_CUR);
+}
+static int stbi__stdio_eof(void *user)
+{
+return feof((FILE*) user);
+}
+static stbi_io_callbacks stbi__stdio_callbacks =
+{
+stbi__stdio_read,
+stbi__stdio_skip,
+stbi__stdio_eof,
+};
+static void stbi__start_file(stbi__context *s, FILE *f)
+{
+stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
+}
+//static void stop_file(stbi__context *s) { }
+#endif // !STBI_NO_STDIO
+static void stbi__rewind(stbi__context *s)
+{
+// conceptually rewind SHOULD rewind to the beginning of the stream,
+// but we just rewind to the beginning of the initial buffer, because
+// we only use it after doing 'test', which only ever looks at at most 92 bytes
+s->img_buffer = s->img_buffer_original;
+s->img_buffer_end = s->img_buffer_original_end;
+}
+#ifndef STBI_NO_JPEG
+static int      stbi__jpeg_test(stbi__context *s);
+static stbi_uc *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+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 stbi_uc *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+#ifndef STBI_NO_BMP
+static int      stbi__bmp_test(stbi__context *s);
+static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+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 stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+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 stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+#ifndef STBI_NO_HDR
+static int      stbi__hdr_test(stbi__context *s);
+static float   *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+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 stbi_uc *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+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 stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, 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 stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+// this is not threadsafe
+static const char *stbi__g_failure_reason;
+STBIDEF const char *stbi_failure_reason(void)
+{
+return stbi__g_failure_reason;
+}
+static int stbi__err(const char *str)
+{
+stbi__g_failure_reason = str;
+return 0;
+}
+static void *stbi__malloc(size_t size)
+{
+return STBI_MALLOC(size);
+}
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+#ifdef STBI_NO_FAILURE_STRINGS
+#define stbi__err(x,y)  0
+#elif defined(STBI_FAILURE_USERMSG)
+#define stbi__err(x,y)  stbi__err(y)
+#else
+#define stbi__err(x,y)  stbi__err(x)
+#endif
+#define stbi__errpf(x,y)   ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpuc(x,y)  ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
+{
+STBI_FREE(retval_from_stbi_load);
+}
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+#endif
+#ifndef STBI_NO_HDR
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp);
+#endif
+static int stbi__vertically_flip_on_load = 0;
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
+{
+stbi__vertically_flip_on_load = flag_true_if_should_flip;
+}
+static unsigned char *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+#ifndef STBI_NO_JPEG
+if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_PNG
+if (stbi__png_test(s))  return stbi__png_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_BMP
+if (stbi__bmp_test(s))  return stbi__bmp_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_GIF
+if (stbi__gif_test(s))  return stbi__gif_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_PSD
+if (stbi__psd_test(s))  return stbi__psd_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_PIC
+if (stbi__pic_test(s))  return stbi__pic_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_PNM
+if (stbi__pnm_test(s))  return stbi__pnm_load(s,x,y,comp,req_comp);
+#endif
+#ifndef STBI_NO_HDR
+if (stbi__hdr_test(s)) {
+float *hdr = stbi__hdr_load(s, x,y,comp,req_comp);
+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);
+#endif
+return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+static unsigned char *stbi__load_flip(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+unsigned char *result = stbi__load_main(s, x, y, comp, req_comp);
+if (stbi__vertically_flip_on_load && result != NULL) {
+int w = *x, h = *y;
+int depth = req_comp ? req_comp : *comp;
+int row,col,z;
+stbi_uc temp;
+// @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
+for (row = 0; row < (h>>1); row++) {
+for (col = 0; col < w; col++) {
+for (z = 0; z < depth; z++) {
+temp = result[(row * w + col) * depth + z];
+result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
+result[((h - row - 1) * w + col) * depth + z] = temp;
+}
+}
+}
+}
+return result;
+}
+#ifndef STBI_NO_HDR
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
+{
+if (stbi__vertically_flip_on_load && result != NULL) {
+int w = *x, h = *y;
+int depth = req_comp ? req_comp : *comp;
+int row,col,z;
+float temp;
+// @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
+for (row = 0; row < (h>>1); row++) {
+for (col = 0; col < w; col++) {
+for (z = 0; z < depth; z++) {
+temp = result[(row * w + col) * depth + z];
+result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
+result[((h - row - 1) * w + col) * depth + z] = temp;
+}
+}
+}
+}
+}
+#endif
+#ifndef STBI_NO_STDIO
+static FILE *stbi__fopen(char const *filename, char const *mode)
+{
+FILE *f;
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+if (0 != fopen_s(&f, filename, mode))
+f=0;
+#else
+f = fopen(filename, mode);
+#endif
+return f;
+}
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+FILE *f = stbi__fopen(filename, "rb");
+unsigned char *result;
+if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
+result = stbi_load_from_file(f,x,y,comp,req_comp);
+fclose(f);
+return result;
+}
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+unsigned char *result;
+stbi__context s;
+stbi__start_file(&s,f);
+result = stbi__load_flip(&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;
+}
+#endif //!STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+stbi__context s;
+stbi__start_mem(&s,buffer,len);
+return stbi__load_flip(&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_flip(&s,x,y,comp,req_comp);
+}
+#ifndef STBI_NO_LINEAR
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+unsigned char *data;
+#ifndef STBI_NO_HDR
+if (stbi__hdr_test(s)) {
+float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp);
+if (hdr_data)
+stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
+return hdr_data;
+}
+#endif
+data = stbi__load_flip(s, x, y, comp, req_comp);
+if (data)
+return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+}
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+stbi__context s;
+stbi__start_mem(&s,buffer,len);
+return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+stbi__context s;
+stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+float *result;
+FILE *f = stbi__fopen(filename, "rb");
+if (!f) return stbi__errpf("can't fopen", "Unable to open file");
+result = stbi_loadf_from_file(f,x,y,comp,req_comp);
+fclose(f);
+return result;
+}
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+stbi__context s;
+stbi__start_file(&s,f);
+return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+#endif // !STBI_NO_STDIO
+#endif // !STBI_NO_LINEAR
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
+{
+#ifndef STBI_NO_HDR
+stbi__context s;
+stbi__start_mem(&s,buffer,len);
+return stbi__hdr_test(&s);
+#else
+STBI_NOTUSED(buffer);
+STBI_NOTUSED(len);
+return 0;
+#endif
+}
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename)
+{
+FILE *f = stbi__fopen(filename, "rb");
+int result=0;
+if (f) {
+result = stbi_is_hdr_from_file(f);
+fclose(f);
+}
+return result;
+}
+STBIDEF int      stbi_is_hdr_from_file(FILE *f)
+{
+#ifndef STBI_NO_HDR
+stbi__context s;
+stbi__start_file(&s,f);
+return stbi__hdr_test(&s);
+#else
+STBI_NOTUSED(f);
+return 0;
+#endif
+}
+#endif // !STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+{
+#ifndef STBI_NO_HDR
+stbi__context s;
+stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+return stbi__hdr_test(&s);
+#else
+STBI_NOTUSED(clbk);
+STBI_NOTUSED(user);
+return 0;
+#endif
+}
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+STBIDEF void   stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
+STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
+STBIDEF void   stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+enum
+{
+STBI__SCAN_load=0,
+STBI__SCAN_type,
+STBI__SCAN_header
+};
+static void stbi__refill_buffer(stbi__context *s)
+{
+int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
+if (n == 0) {
+// at end of file, treat same as if from memory, but need to handle case
+// where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+s->read_from_callbacks = 0;
+s->img_buffer = s->buffer_start;
+s->img_buffer_end = s->buffer_start+1;
+*s->img_buffer = 0;
+} else {
+s->img_buffer = s->buffer_start;
+s->img_buffer_end = s->buffer_start + n;
+}
+}
+stbi_inline static stbi_uc stbi__get8(stbi__context *s)
+{
+if (s->img_buffer < s->img_buffer_end)
+return *s->img_buffer++;
+if (s->read_from_callbacks) {
+stbi__refill_buffer(s);
+return *s->img_buffer++;
+}
+return 0;
+}
+stbi_inline static int stbi__at_eof(stbi__context *s)
+{
+if (s->io.read) {
+if (!(s->io.eof)(s->io_user_data)) return 0;
+// if feof() is true, check if buffer = end
+// special case: we've only got the special 0 character at the end
+if (s->read_from_callbacks == 0) return 1;
+}
+return s->img_buffer >= s->img_buffer_end;
+}
+static void stbi__skip(stbi__context *s, int n)
+{
+if (n < 0) {
+s->img_buffer = s->img_buffer_end;
+return;
+}
+if (s->io.read) {
+int blen = (int) (s->img_buffer_end - s->img_buffer);
+if (blen < n) {
+s->img_buffer = s->img_buffer_end;
+(s->io.skip)(s->io_user_data, n - blen);
+return;
+}
+}
+s->img_buffer += n;
+}
+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
+{
+if (s->io.read) {
+int blen = (int) (s->img_buffer_end - s->img_buffer);
+if (blen < n) {
+int res, count;
+memcpy(buffer, s->img_buffer, blen);
+count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
+res = (count == (n-blen));
+s->img_buffer = s->img_buffer_end;
+return res;
+}
+}
+if (s->img_buffer+n <= s->img_buffer_end) {
+memcpy(buffer, s->img_buffer, n);
+s->img_buffer += n;
+return 1;
+} else
+return 0;
+}
+static int stbi__get16be(stbi__context *s)
+{
+int z = stbi__get8(s);
+return (z << 8) + stbi__get8(s);
+}
+static stbi__uint32 stbi__get32be(stbi__context *s)
+{
+stbi__uint32 z = stbi__get16be(s);
+return (z << 16) + stbi__get16be(s);
+}
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context *s)
+{
+int z = stbi__get8(s);
+return z + (stbi__get8(s) << 8);
+}
+#endif
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context *s)
+{
+stbi__uint32 z = stbi__get16le(s);
+return z + (stbi__get16le(s) << 16);
+}
+#endif
+#define STBI__BYTECAST(x)  ((stbi_uc) ((x) & 255))  // truncate int to byte without warnings
+//////////////////////////////////////////////////////////////////////////////
+//
+//  generic converter from built-in img_n to req_comp
+//    individual types do this automatically as much as possible (e.g. jpeg
+//    does all cases internally since it needs to colorspace convert anyway,
+//    and it never has alpha, so very few cases ). png can automatically
+//    interleave an alpha=255 channel, but falls back to this for other cases
+//
+//  assume data buffer is malloced, so malloc a new one and free that one
+//  only failure mode is malloc failing
+static stbi_uc stbi__compute_y(int r, int g, int b)
+{
+return (stbi_uc) (((r*77) + (g*150) +  (29*b)) >> 8);
+}
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+int i,j;
+unsigned char *good;
+if (req_comp == img_n) return data;
+STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+good = (unsigned char *) stbi__malloc(req_comp * x * y);
+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 COMBO(a,b)  ((a)*8+(b))
+#define CASE(a,b)   case 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 (COMBO(img_n, req_comp)) {
+CASE(1,2) dest[0]=src[0], dest[1]=255; break;
+CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break;
+CASE(2,1) dest[0]=src[0]; break;
+CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break;
+CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break;
+CASE(3,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break;
+CASE(3,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
+CASE(4,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break;
+CASE(4,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break;
+CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break;
+default: STBI_ASSERT(0);
+}
+#undef CASE
+}
+STBI_FREE(data);
+return good;
+}
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+int i,k,n;
+float *output = (float *) stbi__malloc(x * y * comp * sizeof(float));
+if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
+// compute number of non-alpha components
+if (comp & 1) n = comp; else n = comp-1;
+for (i=0; i < x*y; ++i) {
+for (k=0; k < n; ++k) {
+output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+}
+if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
+}
+STBI_FREE(data);
+return output;
+}
+#endif
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x)   ((int) (x))
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp)
+{
+int i,k,n;
+stbi_uc *output = (stbi_uc *) stbi__malloc(x * y * comp);
+if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
+// compute number of non-alpha components
+if (comp & 1) n = comp; else n = comp-1;
+for (i=0; i < x*y; ++i) {
+for (k=0; k < n; ++k) {
+float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+if (z < 0) z = 0;
+if (z > 255) z = 255;
+output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+}
+if (k < comp) {
+float z = data[i*comp+k] * 255 + 0.5f;
+if (z < 0) z = 0;
+if (z > 255) z = 255;
+output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+}
+}
+STBI_FREE(data);
+return output;
+}
+#endif
+//////////////////////////////////////////////////////////////////////////////
+//
+//  "baseline" JPEG/JFIF decoder
+//
+//    simple implementation
+//      - doesn't support delayed output of y-dimension
+//      - simple interface (only one output format: 8-bit interleaved RGB)
+//      - doesn't try to recover corrupt jpegs
+//      - doesn't allow partial loading, loading multiple at once
+//      - still fast on x86 (copying globals into locals doesn't help x86)
+//      - allocates lots of intermediate memory (full size of all components)
+//        - non-interleaved case requires this anyway
+//        - allows good upsampling (see next)
+//    high-quality
+//      - upsampled channels are bilinearly interpolated, even across blocks
+//      - quality integer IDCT derived from IJG's 'slow'
+//    performance
+//      - fast huffman; reasonable integer IDCT
+//      - some SIMD kernels for common paths on targets with SSE2/NEON
+//      - uses a lot of intermediate memory, could cache poorly
+#ifndef STBI_NO_JPEG
+// huffman decoding acceleration
+#define FAST_BITS   9  // larger handles more cases; smaller stomps less cache
+typedef struct
+{
+stbi_uc  fast[1 << FAST_BITS];
+// weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+stbi__uint16 code[256];
+stbi_uc  values[256];
+stbi_uc  size[257];
+unsigned int maxcode[18];
+int    delta[17];   // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+typedef struct
+{
+stbi__context *s;
+stbi__huffman huff_dc[4];
+stbi__huffman huff_ac[4];
+stbi_uc dequant[4][64];
+stbi__int16 fast_ac[4][1 << FAST_BITS];
+// sizes for components, interleaved MCUs
+int img_h_max, img_v_max;
+int img_mcu_x, img_mcu_y;
+int img_mcu_w, img_mcu_h;
+// definition of jpeg image component
+struct
+{
+int id;
+int h,v;
+int tq;
+int hd,ha;
+int dc_pred;
+int x,y,w2,h2;
+stbi_uc *data;
+void *raw_data, *raw_coeff;
+stbi_uc *linebuf;
+short   *coeff;   // progressive only
+int      coeff_w, coeff_h; // number of 8x8 coefficient blocks
+} img_comp[4];
+stbi__uint32   code_buffer; // jpeg entropy-coded buffer
+int            code_bits;   // number of valid bits
+unsigned char  marker;      // marker seen while filling entropy buffer
+int            nomore;      // flag if we saw a marker so must stop
+int            progressive;
+int            spec_start;
+int            spec_end;
+int            succ_high;
+int            succ_low;
+int            eob_run;
+int scan_n, order[4];
+int restart_interval, todo;
+// kernels
+void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
+stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
+} stbi__jpeg;
+static int stbi__build_huffman(stbi__huffman *h, int *count)
+{
+int i,j,k=0,code;
+// build size list for each symbol (from JPEG spec)
+for (i=0; i < 16; ++i)
+for (j=0; j < count[i]; ++j)
+h->size[k++] = (stbi_uc) (i+1);
+h->size[k] = 0;
+// compute actual symbols (from jpeg spec)
+code = 0;
+k = 0;
+for(j=1; j <= 16; ++j) {
+// compute delta to add to code to compute symbol id
+h->delta[j] = k - code;
+if (h->size[k] == j) {
+while (h->size[k] == j)
+h->code[k++] = (stbi__uint16) (code++);
+if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG");
+}
+// compute largest code + 1 for this size, preshifted as needed later
+h->maxcode[j] = code << (16-j);
+code <<= 1;
+}
+h->maxcode[j] = 0xffffffff;
+// build non-spec acceleration table; 255 is flag for not-accelerated
+memset(h->fast, 255, 1 << FAST_BITS);
+for (i=0; i < k; ++i) {
+int s = h->size[i];
+if (s <= FAST_BITS) {
+int c = h->code[i] << (FAST_BITS-s);
+int m = 1 << (FAST_BITS-s);
+for (j=0; j < m; ++j) {
+h->fast[c+j] = (stbi_uc) i;
+}
+}
+}
+return 1;
+}
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
+{
+int i;
+for (i=0; i < (1 << FAST_BITS); ++i) {
+stbi_uc fast = h->fast[i];
+fast_ac[i] = 0;
+if (fast < 255) {
+int rs = h->values[fast];
+int run = (rs >> 4) & 15;
+int magbits = rs & 15;
+int len = h->size[fast];
+if (magbits && len + magbits <= FAST_BITS) {
+// magnitude code followed by receive_extend code
+int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+int m = 1 << (magbits - 1);
+if (k < m) k += (-1 << magbits) + 1;
+// if the result is small enough, we can fit it in fast_ac table
+if (k >= -128 && k <= 127)
+fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits));
+}
+}
+}
+}
+static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
+{
+do {
+int b = j->nomore ? 0 : stbi__get8(j->s);
+if (b == 0xff) {
+int c = stbi__get8(j->s);
+if (c != 0) {
+j->marker = (unsigned char) c;
+j->nomore = 1;
+return;
+}
+}
+j->code_buffer |= b << (24 - j->code_bits);
+j->code_bits += 8;
+} while (j->code_bits <= 24);
+}
+// (1 << n) - 1
+static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
+{
+unsigned int temp;
+int c,k;
+if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+// look at the top FAST_BITS and determine what symbol ID it is,
+// if the code is <= FAST_BITS
+c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+k = h->fast[c];
+if (k < 255) {
+int s = h->size[k];
+if (s > j->code_bits)
+return -1;
+j->code_buffer <<= s;
+j->code_bits -= s;
+return h->values[k];
+}
+// naive test is to shift the code_buffer down so k bits are
+// valid, then test against maxcode. To speed this up, we've
+// preshifted maxcode left so that it has (16-k) 0s at the
+// end; in other words, regardless of the number of bits, it
+// wants to be compared against something shifted to have 16;
+// that way we don't need to shift inside the loop.
+temp = j->code_buffer >> 16;
+for (k=FAST_BITS+1 ; ; ++k)
+if (temp < h->maxcode[k])
+break;
+if (k == 17) {
+// error! code not found
+j->code_bits -= 16;
+return -1;
+}
+if (k > j->code_bits)
+return -1;
+// convert the huffman code to the symbol id
+c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+// convert the id to a symbol
+j->code_bits -= k;
+j->code_buffer <<= k;
+return h->values[c];
+}
+// bias[n] = (-1<<n) + 1
+static int const 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);
+STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask)));
+j->code_buffer = k & ~stbi__bmask[n];
+k &= stbi__bmask[n];
+j->code_bits -= n;
+return k + (stbi__jbias[n] & ~sgn);
+}
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
+{
+unsigned int k;
+if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+k = stbi_lrot(j->code_buffer, n);
+j->code_buffer = k & ~stbi__bmask[n];
+k &= stbi__bmask[n];
+j->code_bits -= n;
+return k;
+}
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
+{
+unsigned int k;
+if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
+k = j->code_buffer;
+j->code_buffer <<= 1;
+--j->code_bits;
+return k & 0x80000000;
+}
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static stbi_uc stbi__jpeg_dezigzag[64+15] =
+{
+0,  1,  8, 16,  9,  2,  3, 10,
+17, 24, 32, 25, 18, 11,  4,  5,
+12, 19, 26, 33, 40, 48, 41, 34,
+27, 20, 13,  6,  7, 14, 21, 28,
+35, 42, 49, 56, 57, 50, 43, 36,
+29, 22, 15, 23, 30, 37, 44, 51,
+58, 59, 52, 45, 38, 31, 39, 46,
+53, 60, 61, 54, 47, 55, 62, 63,
+// let corrupt input sample past end
+63, 63, 63, 63, 63, 63, 63, 63,
+63, 63, 63, 63, 63, 63, 63
+};
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant)
+{
+int diff,dc,k;
+int t;
+if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+t = stbi__jpeg_huff_decode(j, hdc);
+if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+// 0 all the ac values now so we can do it 32-bits at a time
+memset(data,0,64*sizeof(data[0]));
+diff = t ? stbi__extend_receive(j, t) : 0;
+dc = j->img_comp[b].dc_pred + diff;
+j->img_comp[b].dc_pred = dc;
+data[0] = (short) (dc * dequant[0]);
+// decode AC components, see JPEG spec
+k = 1;
+do {
+unsigned int zig;
+int c,r,s;
+if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+r = fac[c];
+if (r) { // fast-AC path
+k += (r >> 4) & 15; // run
+s = r & 15; // combined length
+j->code_buffer <<= s;
+j->code_bits -= s;
+// decode into unzigzag'd location
+zig = stbi__jpeg_dezigzag[k++];
+data[zig] = (short) ((r >> 8) * dequant[zig]);
+} else {
+int rs = stbi__jpeg_huff_decode(j, hac);
+if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+s = rs & 15;
+r = rs >> 4;
+if (s == 0) {
+if (rs != 0xf0) break; // end block
+k += 16;
+} else {
+k += r;
+// decode into unzigzag'd location
+zig = stbi__jpeg_dezigzag[k++];
+data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
+}
+}
+} while (k < 64);
+return 1;
+}
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
+{
+int diff,dc;
+int t;
+if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+if (j->succ_high == 0) {
+// first scan for DC coefficient, must be first
+memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
+t = stbi__jpeg_huff_decode(j, hdc);
+diff = t ? stbi__extend_receive(j, t) : 0;
+dc = j->img_comp[b].dc_pred + diff;
+j->img_comp[b].dc_pred = dc;
+data[0] = (short) (dc << j->succ_low);
+} else {
+// refinement scan for DC coefficient
+if (stbi__jpeg_get_bit(j))
+data[0] += (short) (1 << j->succ_low);
+}
+return 1;
+}
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
+{
+int k;
+if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+if (j->succ_high == 0) {
+int shift = j->succ_low;
+if (j->eob_run) {
+--j->eob_run;
+return 1;
+}
+k = j->spec_start;
+do {
+unsigned int zig;
+int c,r,s;
+if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+r = fac[c];
+if (r) { // fast-AC path
+k += (r >> 4) & 15; // run
+s = r & 15; // combined length
+j->code_buffer <<= s;
+j->code_bits -= s;
+zig = stbi__jpeg_dezigzag[k++];
+data[zig] = (short) ((r >> 8) << shift);
+} else {
+int rs = stbi__jpeg_huff_decode(j, hac);
+if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+s = rs & 15;
+r = rs >> 4;
+if (s == 0) {
+if (r < 15) {
+j->eob_run = (1 << r);
+if (r)
+j->eob_run += stbi__jpeg_get_bits(j, r);
+--j->eob_run;
+break;
+}
+k += 16;
+} else {
+k += r;
+zig = stbi__jpeg_dezigzag[k++];
+data[zig] = (short) (stbi__extend_receive(j,s) << shift);
+}
+}
+} while (k <= j->spec_end);
+} else {
+// refinement scan for these AC coefficients
+short bit = (short) (1 << j->succ_low);
+if (j->eob_run) {
+--j->eob_run;
+for (k = j->spec_start; k <= j->spec_end; ++k) {
+short *p = &data[stbi__jpeg_dezigzag[k]];
+if (*p != 0)
+if (stbi__jpeg_get_bit(j))
+if ((*p & bit)==0) {
+if (*p > 0)
+*p += bit;
+else
+*p -= bit;
+}
+}
+} else {
+k = j->spec_start;
+do {
+int r,s;
+int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
+if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+s = rs & 15;
+r = rs >> 4;
+if (s == 0) {
+if (r < 15) {
+j->eob_run = (1 << r) - 1;
+if (r)
+j->eob_run += stbi__jpeg_get_bits(j, r);
+r = 64; // force end of block
+} else {
+// r=15 s=0 should write 16 0s, so we just do
+// a run of 15 0s and then write s (which is 0),
+// so we don't have to do anything special here
+}
+} else {
+if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
+// sign bit
+if (stbi__jpeg_get_bit(j))
+s = bit;
+else
+s = -bit;
+}
+// advance by r
+while (k <= j->spec_end) {
+short *p = &data[stbi__jpeg_dezigzag[k++]];
+if (*p != 0) {
+if (stbi__jpeg_get_bit(j))
+if ((*p & bit)==0) {
+if (*p > 0)
+*p += bit;
+else
+*p -= bit;
+}
+} else {
+if (r == 0) {
+*p = (short) s;
+break;
+}
+--r;
+}
+}
+} while (k <= j->spec_end);
+}
+}
+return 1;
+}
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x)
+{
+// trick to use a single test to catch both cases
+if ((unsigned int) x > 255) {
+if (x < 0) return 0;
+if (x > 255) return 255;
+}
+return (stbi_uc) x;
+}
+#define stbi__f2f(x)  ((int) (((x) * 4096 + 0.5)))
+#define stbi__fsh(x)  ((x) << 12)
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
+int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
+p2 = s2;                                    \
+p3 = s6;                                    \
+p1 = (p2+p3) * stbi__f2f(0.5411961f);       \
+t2 = p1 + p3*stbi__f2f(-1.847759065f);      \
+t3 = p1 + p2*stbi__f2f( 0.765366865f);      \
+p2 = s0;                                    \
+p3 = s4;                                    \
+t0 = stbi__fsh(p2+p3);                      \
+t1 = stbi__fsh(p2-p3);                      \
+x0 = t0+t3;                                 \
+x3 = t0-t3;                                 \
+x1 = t1+t2;                                 \
+x2 = t1-t2;                                 \
+t0 = s7;                                    \
+t1 = s5;                                    \
+t2 = s3;                                    \
+t3 = s1;                                    \
+p3 = t0+t2;                                 \
+p4 = t1+t3;                                 \
+p1 = t0+t3;                                 \
+p2 = t1+t2;                                 \
+p5 = (p3+p4)*stbi__f2f( 1.175875602f);      \
+t0 = t0*stbi__f2f( 0.298631336f);           \
+t1 = t1*stbi__f2f( 2.053119869f);           \
+t2 = t2*stbi__f2f( 3.072711026f);           \
+t3 = t3*stbi__f2f( 1.501321110f);           \
+p1 = p5 + p1*stbi__f2f(-0.899976223f);      \
+p2 = p5 + p2*stbi__f2f(-2.562915447f);      \
+p3 = p3*stbi__f2f(-1.961570560f);           \
+p4 = p4*stbi__f2f(-0.390180644f);           \
+t3 += p1+p4;                                \
+t2 += p2+p3;                                \
+t1 += p2+p4;                                \
+t0 += p1+p3;
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
+{
+int i,val[64],*v=val;
+stbi_uc *o;
+short *d = data;
+// columns
+for (i=0; i < 8; ++i,++d, ++v) {
+// if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
+&& d[40]==0 && d[48]==0 && d[56]==0) {
+//    no shortcut                 0     seconds
+//    (1|2|3|4|5|6|7)==0          0     seconds
+//    all separate               -0.047 seconds
+//    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
+int dcterm = d[0] << 2;
+v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+} else {
+STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
+// constants scaled things up by 1<<12; let's bring them back
+// down, but keep 2 extra bits of precision
+x0 += 512; x1 += 512; x2 += 512; x3 += 512;
+v[ 0] = (x0+t3) >> 10;
+v[56] = (x0-t3) >> 10;
+v[ 8] = (x1+t2) >> 10;
+v[48] = (x1-t2) >> 10;
+v[16] = (x2+t1) >> 10;
+v[40] = (x2-t1) >> 10;
+v[24] = (x3+t0) >> 10;
+v[32] = (x3-t0) >> 10;
+}
+}
+for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
+// no fast case since the first 1D IDCT spread components out
+STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
+// constants scaled things up by 1<<12, plus we had 1<<2 from first
+// loop, plus horizontal and vertical each scale by sqrt(8) so together
+// we've got an extra 1<<3, so 1<<17 total we need to remove.
+// so we want to round that, which means adding 0.5 * 1<<17,
+// aka 65536. Also, we'll end up with -128 to 127 that we want
+// to encode as 0..255 by adding 128, so we'll add that before the shift
+x0 += 65536 + (128<<17);
+x1 += 65536 + (128<<17);
+x2 += 65536 + (128<<17);
+x3 += 65536 + (128<<17);
+// tried computing the shifts into temps, or'ing the temps to see
+// if any were out of range, but that was slower
+o[0] = stbi__clamp((x0+t3) >> 17);
+o[7] = stbi__clamp((x0-t3) >> 17);
+o[1] = stbi__clamp((x1+t2) >> 17);
+o[6] = stbi__clamp((x1-t2) >> 17);
+o[2] = stbi__clamp((x2+t1) >> 17);
+o[5] = stbi__clamp((x2-t1) >> 17);
+o[3] = stbi__clamp((x3+t0) >> 17);
+o[4] = stbi__clamp((x3-t0) >> 17);
+}
+}
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+// This is constructed to match our regular (generic) integer IDCT exactly.
+__m128i row0, row1, row2, row3, row4, row5, row6, row7;
+__m128i tmp;
+// dot product constant: even elems=x, odd elems=y
+#define dct_const(x,y)  _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
+// out(0) = c0[even]*x + c0[odd]*y   (c0, x, y 16-bit, out 32-bit)
+// out(1) = c1[even]*x + c1[odd]*y
+#define dct_rot(out0,out1, x,y,c0,c1) \
+__m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
+__m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
+__m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+__m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+__m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+__m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+// out = in << 12  (in 16-bit, out 32-bit)
+#define dct_widen(out, in) \
+__m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+__m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+// wide add
+#define dct_wadd(out, a, b) \
+__m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+__m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+// wide sub
+#define dct_wsub(out, a, b) \
+__m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+__m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+// butterfly a/b, add bias, then shift by "s" and pack
+#define dct_bfly32o(out0, out1, a,b,bias,s) \
+{ \
+__m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+__m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+dct_wadd(sum, abiased, b); \
+dct_wsub(dif, abiased, b); \
+out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
+out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
+}
+// 8-bit interleave step (for transposes)
+#define dct_interleave8(a, b) \
+tmp = a; \
+a = _mm_unpacklo_epi8(a, b); \
+b = _mm_unpackhi_epi8(tmp, b)
+// 16-bit interleave step (for transposes)
+#define dct_interleave16(a, b) \
+tmp = a; \
+a = _mm_unpacklo_epi16(a, b); \
+b = _mm_unpackhi_epi16(tmp, b)
+#define dct_pass(bias,shift) \
+{ \
+/* even part */ \
+dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
+__m128i sum04 = _mm_add_epi16(row0, row4); \
+__m128i dif04 = _mm_sub_epi16(row0, row4); \
+dct_widen(t0e, sum04); \
+dct_widen(t1e, dif04); \
+dct_wadd(x0, t0e, t3e); \
+dct_wsub(x3, t0e, t3e); \
+dct_wadd(x1, t1e, t2e); \
+dct_wsub(x2, t1e, t2e); \
+/* odd part */ \
+dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
+dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
+__m128i sum17 = _mm_add_epi16(row1, row7); \
+__m128i sum35 = _mm_add_epi16(row3, row5); \
+dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
+dct_wadd(x4, y0o, y4o); \
+dct_wadd(x5, y1o, y5o); \
+dct_wadd(x6, y2o, y5o); \
+dct_wadd(x7, y3o, y4o); \
+dct_bfly32o(row0,row7, x0,x7,bias,shift); \
+dct_bfly32o(row1,row6, x1,x6,bias,shift); \
+dct_bfly32o(row2,row5, x2,x5,bias,shift); \
+dct_bfly32o(row3,row4, x3,x4,bias,shift); \
+}
+__m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+__m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
+__m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+__m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+__m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
+__m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
+__m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
+__m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
+// rounding biases in column/row passes, see stbi__idct_block for explanation.
+__m128i bias_0 = _mm_set1_epi32(512);
+__m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
+// load
+row0 = _mm_load_si128((const __m128i *) (data + 0*8));
+row1 = _mm_load_si128((const __m128i *) (data + 1*8));
+row2 = _mm_load_si128((const __m128i *) (data + 2*8));
+row3 = _mm_load_si128((const __m128i *) (data + 3*8));
+row4 = _mm_load_si128((const __m128i *) (data + 4*8));
+row5 = _mm_load_si128((const __m128i *) (data + 5*8));
+row6 = _mm_load_si128((const __m128i *) (data + 6*8));
+row7 = _mm_load_si128((const __m128i *) (data + 7*8));
+// column pass
+dct_pass(bias_0, 10);
+{
+// 16bit 8x8 transpose pass 1
+dct_interleave16(row0, row4);
+dct_interleave16(row1, row5);
+dct_interleave16(row2, row6);
+dct_interleave16(row3, row7);
+// transpose pass 2
+dct_interleave16(row0, row2);
+dct_interleave16(row1, row3);
+dct_interleave16(row4, row6);
+dct_interleave16(row5, row7);
+// transpose pass 3
+dct_interleave16(row0, row1);
+dct_interleave16(row2, row3);
+dct_interleave16(row4, row5);
+dct_interleave16(row6, row7);
+}
+// row pass
+dct_pass(bias_1, 17);
+{
+// pack
+__m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+__m128i p1 = _mm_packus_epi16(row2, row3);
+__m128i p2 = _mm_packus_epi16(row4, row5);
+__m128i p3 = _mm_packus_epi16(row6, row7);
+// 8bit 8x8 transpose pass 1
+dct_interleave8(p0, p2); // a0e0a1e1...
+dct_interleave8(p1, p3); // c0g0c1g1...
+// transpose pass 2
+dct_interleave8(p0, p1); // a0c0e0g0...
+dct_interleave8(p2, p3); // b0d0f0h0...
+// transpose pass 3
+dct_interleave8(p0, p2); // a0b0c0d0...
+dct_interleave8(p1, p3); // a4b4c4d4...
+// store
+_mm_storel_epi64((__m128i *) out, p0); out += out_stride;
+_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
+_mm_storel_epi64((__m128i *) out, p2); out += out_stride;
+_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
+_mm_storel_epi64((__m128i *) out, p1); out += out_stride;
+_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
+_mm_storel_epi64((__m128i *) out, p3); out += out_stride;
+_mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
+}
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+#endif // STBI_SSE2
+#ifdef STBI_NEON
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
+int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
+int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
+int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
+int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
+int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
+#define dct_long_mul(out, inq, coeff) \
+int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+#define dct_long_mac(out, acc, inq, coeff) \
+int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+#define dct_widen(out, inq) \
+int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+// wide add
+#define dct_wadd(out, a, b) \
+int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+// wide sub
+#define dct_wsub(out, a, b) \
+int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
+{ \
+dct_wadd(sum, a, b); \
+dct_wsub(dif, a, b); \
+out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+}
+#define dct_pass(shiftop, shift) \
+{ \
+/* even part */ \
+int16x8_t sum26 = vaddq_s16(row2, row6); \
+dct_long_mul(p1e, sum26, rot0_0); \
+dct_long_mac(t2e, p1e, row6, rot0_1); \
+dct_long_mac(t3e, p1e, row2, rot0_2); \
+int16x8_t sum04 = vaddq_s16(row0, row4); \
+int16x8_t dif04 = vsubq_s16(row0, row4); \
+dct_widen(t0e, sum04); \
+dct_widen(t1e, dif04); \
+dct_wadd(x0, t0e, t3e); \
+dct_wsub(x3, t0e, t3e); \
+dct_wadd(x1, t1e, t2e); \
+dct_wsub(x2, t1e, t2e); \
+/* odd part */ \
+int16x8_t sum15 = vaddq_s16(row1, row5); \
+int16x8_t sum17 = vaddq_s16(row1, row7); \
+int16x8_t sum35 = vaddq_s16(row3, row5); \
+int16x8_t sum37 = vaddq_s16(row3, row7); \
+int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+dct_long_mul(p5o, sumodd, rot1_0); \
+dct_long_mac(p1o, p5o, sum17, rot1_1); \
+dct_long_mac(p2o, p5o, sum35, rot1_2); \
+dct_long_mul(p3o, sum37, rot2_0); \
+dct_long_mul(p4o, sum15, rot2_1); \
+dct_wadd(sump13o, p1o, p3o); \
+dct_wadd(sump24o, p2o, p4o); \
+dct_wadd(sump23o, p2o, p3o); \
+dct_wadd(sump14o, p1o, p4o); \
+dct_long_mac(x4, sump13o, row7, rot3_0); \
+dct_long_mac(x5, sump24o, row5, rot3_1); \
+dct_long_mac(x6, sump23o, row3, rot3_2); \
+dct_long_mac(x7, sump14o, row1, rot3_3); \
+dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
+dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
+dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
+dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
+}
+// load
+row0 = vld1q_s16(data + 0*8);
+row1 = vld1q_s16(data + 1*8);
+row2 = vld1q_s16(data + 2*8);
+row3 = vld1q_s16(data + 3*8);
+row4 = vld1q_s16(data + 4*8);
+row5 = vld1q_s16(data + 5*8);
+row6 = vld1q_s16(data + 6*8);
+row7 = vld1q_s16(data + 7*8);
+// add DC bias
+row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+// column pass
+dct_pass(vrshrn_n_s32, 10);
+// 16bit 8x8 transpose
+{
+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
+#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
+// pass 1
+dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+dct_trn16(row2, row3);
+dct_trn16(row4, row5);
+dct_trn16(row6, row7);
+// pass 2
+dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+dct_trn32(row1, row3);
+dct_trn32(row4, row6);
+dct_trn32(row5, row7);
+// pass 3
+dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+dct_trn64(row1, row5);
+dct_trn64(row2, row6);
+dct_trn64(row3, row7);
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+}
+// row pass
+// vrshrn_n_s32 only supports shifts up to 16, we need
+// 17. so do a non-rounding shift of 16 first then follow
+// up with a rounding shift by 1.
+dct_pass(vshrn_n_s32, 16);
+{
+// pack and round
+uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+// again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
+#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
+// sadly can't use interleaved stores here since we only write
+// 8 bytes to each scan line!
+// 8x8 8-bit transpose pass 1
+dct_trn8_8(p0, p1);
+dct_trn8_8(p2, p3);
+dct_trn8_8(p4, p5);
+dct_trn8_8(p6, p7);
+// pass 2
+dct_trn8_16(p0, p2);
+dct_trn8_16(p1, p3);
+dct_trn8_16(p4, p6);
+dct_trn8_16(p5, p7);
+// pass 3
+dct_trn8_32(p0, p4);
+dct_trn8_32(p1, p5);
+dct_trn8_32(p2, p6);
+dct_trn8_32(p3, p7);
+// store
+vst1_u8(out, p0); out += out_stride;
+vst1_u8(out, p1); out += out_stride;
+vst1_u8(out, p2); out += out_stride;
+vst1_u8(out, p3); out += out_stride;
+vst1_u8(out, p4); out += out_stride;
+vst1_u8(out, p5); out += out_stride;
+vst1_u8(out, p6); out += out_stride;
+vst1_u8(out, p7);
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+}
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+#endif // STBI_NEON
+#define STBI__MARKER_none  0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg *j)
+{
+stbi_uc x;
+if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
+x = stbi__get8(j->s);
+if (x != 0xff) return STBI__MARKER_none;
+while (x == 0xff)
+x = stbi__get8(j->s);
+return x;
+}
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x)     ((x) >= 0xd0 && (x) <= 0xd7)
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg *j)
+{
+j->code_bits = 0;
+j->code_buffer = 0;
+j->nomore = 0;
+j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0;
+j->marker = STBI__MARKER_none;
+j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+j->eob_run = 0;
+// no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+// since we don't even allow 1<<30 pixels
+}
+static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
+{
+stbi__jpeg_reset(z);
+if (!z->progressive) {
+if (z->scan_n == 1) {
+int i,j;
+STBI_SIMD_ALIGN(short, data[64]);
+int n = z->order[0];
+// non-interleaved data, we just need to process one block at a time,
+// in trivial scanline order
+// number of blocks to do just depends on how many actual "pixels" this
+// component has, independent of interleaved MCU blocking and such
+int w = (z->img_comp[n].x+7) >> 3;
+int h = (z->img_comp[n].y+7) >> 3;
+for (j=0; j < h; ++j) {
+for (i=0; i < w; ++i) {
+int ha = z->img_comp[n].ha;
+if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+// every data block is an MCU, so countdown the restart interval
+if (--z->todo <= 0) {
+if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+// if it's NOT a restart, then just bail, so we get corrupt data
+// rather than no data
+if (!STBI__RESTART(z->marker)) return 1;
+stbi__jpeg_reset(z);
+}
+}
+}
+return 1;
+} else { // interleaved
+int i,j,k,x,y;
+STBI_SIMD_ALIGN(short, data[64]);
+for (j=0; j < z->img_mcu_y; ++j) {
+for (i=0; i < z->img_mcu_x; ++i) {
+// scan an interleaved mcu... process scan_n components in order
+for (k=0; k < z->scan_n; ++k) {
+int n = z->order[k];
+// scan out an mcu's worth of this component; that's just determined
+// by the basic H and V specified for the component
+for (y=0; y < z->img_comp[n].v; ++y) {
+for (x=0; x < z->img_comp[n].h; ++x) {
+int x2 = (i*z->img_comp[n].h + x)*8;
+int y2 = (j*z->img_comp[n].v + y)*8;
+int ha = z->img_comp[n].ha;
+if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
+}
+}
+}
+// after all interleaved components, that's an interleaved MCU,
+// so now count down the restart interval
+if (--z->todo <= 0) {
+if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+if (!STBI__RESTART(z->marker)) return 1;
+stbi__jpeg_reset(z);
+}
+}
+}
+return 1;
+}
+} else {
+if (z->scan_n == 1) {
+int i,j;
+int n = z->order[0];
+// non-interleaved data, we just need to process one block at a time,
+// in trivial scanline order
+// number of blocks to do just depends on how many actual "pixels" this
+// component has, independent of interleaved MCU blocking and such
+int w = (z->img_comp[n].x+7) >> 3;
+int h = (z->img_comp[n].y+7) >> 3;
+for (j=0; j < h; ++j) {
+for (i=0; i < w; ++i) {
+short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+if (z->spec_start == 0) {
+if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+return 0;
+} else {
+int ha = z->img_comp[n].ha;
+if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+return 0;
+}
+// every data block is an MCU, so countdown the restart interval
+if (--z->todo <= 0) {
+if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+if (!STBI__RESTART(z->marker)) return 1;
+stbi__jpeg_reset(z);
+}
+}
+}
+return 1;
+} else { // interleaved
+int i,j,k,x,y;
+for (j=0; j < z->img_mcu_y; ++j) {
+for (i=0; i < z->img_mcu_x; ++i) {
+// scan an interleaved mcu... process scan_n components in order
+for (k=0; k < z->scan_n; ++k) {
+int n = z->order[k];
+// scan out an mcu's worth of this component; that's just determined
+// by the basic H and V specified for the component
+for (y=0; y < z->img_comp[n].v; ++y) {
+for (x=0; x < z->img_comp[n].h; ++x) {
+int x2 = (i*z->img_comp[n].h + x);
+int y2 = (j*z->img_comp[n].v + y);
+short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+return 0;
+}
+}
+}
+// after all interleaved components, that's an interleaved MCU,
+// so now count down the restart interval
+if (--z->todo <= 0) {
+if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+if (!STBI__RESTART(z->marker)) return 1;
+stbi__jpeg_reset(z);
+}
+}
+}
+return 1;
+}
+}
+}
+static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant)
+{
+int i;
+for (i=0; i < 64; ++i)
+data[i] *= dequant[i];
+}
+static void stbi__jpeg_finish(stbi__jpeg *z)
+{
+if (z->progressive) {
+// dequantize and idct the data
+int i,j,n;
+for (n=0; n < z->s->img_n; ++n) {
+int w = (z->img_comp[n].x+7) >> 3;
+int h = (z->img_comp[n].y+7) >> 3;
+for (j=0; j < h; ++j) {
+for (i=0; i < w; ++i) {
+short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+}
+}
+}
+}
+}
+static int stbi__process_marker(stbi__jpeg *z, int m)
+{
+int L;
+switch (m) {
+case STBI__MARKER_none: // no marker found
+return stbi__err("expected marker","Corrupt JPEG");
+case 0xDD: // DRI - specify restart interval
+if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
+z->restart_interval = stbi__get16be(z->s);
+return 1;
+case 0xDB: // DQT - define quantization table
+L = stbi__get16be(z->s)-2;
+while (L > 0) {
+int q = stbi__get8(z->s);
+int p = q >> 4;
+int t = q & 15,i;
+if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG");
+if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
+for (i=0; i < 64; ++i)
+z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s);
+L -= 65;
+}
+return L==0;
+case 0xC4: // DHT - define huffman table
+L = stbi__get16be(z->s)-2;
+while (L > 0) {
+stbi_uc *v;
+int sizes[16],i,n=0;
+int q = stbi__get8(z->s);
+int tc = q >> 4;
+int th = q & 15;
+if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
+for (i=0; i < 16; ++i) {
+sizes[i] = stbi__get8(z->s);
+n += sizes[i];
+}
+L -= 17;
+if (tc == 0) {
+if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
+v = z->huff_dc[th].values;
+} else {
+if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
+v = z->huff_ac[th].values;
+}
+for (i=0; i < n; ++i)
+v[i] = stbi__get8(z->s);
+if (tc != 0)
+stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+L -= n;
+}
+return L==0;
+}
+// check for comment block or APP blocks
+if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+stbi__skip(z->s, stbi__get16be(z->s)-2);
+return 1;
+}
+return 0;
+}
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg *z)
+{
+int i;
+int Ls = stbi__get16be(z->s);
+z->scan_n = stbi__get8(z->s);
+if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
+if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
+for (i=0; i < z->scan_n; ++i) {
+int id = stbi__get8(z->s), which;
+int q = stbi__get8(z->s);
+for (which = 0; which < z->s->img_n; ++which)
+if (z->img_comp[which].id == id)
+break;
+if (which == z->s->img_n) return 0; // no match
+z->img_comp[which].hd = q >> 4;   if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
+z->img_comp[which].ha = q & 15;   if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
+z->order[i] = which;
+}
+{
+int aa;
+z->spec_start = stbi__get8(z->s);
+z->spec_end   = stbi__get8(z->s); // should be 63, but might be 0
+aa = stbi__get8(z->s);
+z->succ_high = (aa >> 4);
+z->succ_low  = (aa & 15);
+if (z->progressive) {
+if (z->spec_start > 63 || z->spec_end > 63  || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
+return stbi__err("bad SOS", "Corrupt JPEG");
+} else {
+if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
+if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
+z->spec_end = 63;
+}
+}
+return 1;
+}
+static int stbi__process_frame_header(stbi__jpeg *z, int scan)
+{
+stbi__context *s = z->s;
+int Lf,p,i,q, h_max=1,v_max=1,c;
+Lf = stbi__get16be(s);         if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
+p  = stbi__get8(s);            if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
+s->img_y = stbi__get16be(s);   if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
+s->img_x = stbi__get16be(s);   if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
+c = stbi__get8(s);
+if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG");    // JFIF requires
+s->img_n = c;
+for (i=0; i < c; ++i) {
+z->img_comp[i].data = NULL;
+z->img_comp[i].linebuf = NULL;
+}
+if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
+for (i=0; i < s->img_n; ++i) {
+z->img_comp[i].id = stbi__get8(s);
+if (z->img_comp[i].id != i+1)   // JFIF requires
+if (z->img_comp[i].id != i)  // some version of jpegtran outputs non-JFIF-compliant files!
+return stbi__err("bad component ID","Corrupt JPEG");
+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 ((1 << 30) / s->img_x / s->img_n < s->img_y) 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;
+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
+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].raw_data = stbi__malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15);
+if (z->img_comp[i].raw_data == NULL) {
+for(--i; i >= 0; --i) {
+STBI_FREE(z->img_comp[i].raw_data);
+z->img_comp[i].raw_data = NULL;
+}
+return 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);
+z->img_comp[i].linebuf = NULL;
+if (z->progressive) {
+z->img_comp[i].coeff_w = (z->img_comp[i].w2 + 7) >> 3;
+z->img_comp[i].coeff_h = (z->img_comp[i].h2 + 7) >> 3;
+z->img_comp[i].raw_coeff = STBI_MALLOC(z->img_comp[i].coeff_w * z->img_comp[i].coeff_h * 64 * sizeof(short) + 15);
+z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
+} else {
+z->img_comp[i].coeff = 0;
+z->img_comp[i].raw_coeff = 0;
+}
+}
+return 1;
+}
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x)         ((x) == 0xdc)
+#define stbi__SOI(x)         ((x) == 0xd8)
+#define stbi__EOI(x)         ((x) == 0xd9)
+#define stbi__SOF(x)         ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x)         ((x) == 0xda)
+#define stbi__SOF_progressive(x)   ((x) == 0xc2)
+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
+{
+int m;
+z->marker = STBI__MARKER_none; // initialize cached marker to empty
+m = stbi__get_marker(z);
+if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
+if (scan == STBI__SCAN_type) return 1;
+m = stbi__get_marker(z);
+while (!stbi__SOF(m)) {
+if (!stbi__process_marker(z,m)) return 0;
+m = stbi__get_marker(z);
+while (m == STBI__MARKER_none) {
+// some files have extra padding after their blocks, so ok, we'll scan
+if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
+m = stbi__get_marker(z);
+}
+}
+z->progressive = stbi__SOF_progressive(m);
+if (!stbi__process_frame_header(z, scan)) return 0;
+return 1;
+}
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg *j)
+{
+int m;
+for (m = 0; m < 4; m++) {
+j->img_comp[m].raw_data = NULL;
+j->img_comp[m].raw_coeff = NULL;
+}
+j->restart_interval = 0;
+if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
+m = stbi__get_marker(j);
+while (!stbi__EOI(m)) {
+if (stbi__SOS(m)) {
+if (!stbi__process_scan_header(j)) return 0;
+if (!stbi__parse_entropy_coded_data(j)) return 0;
+if (j->marker == STBI__MARKER_none ) {
+// handle 0s at the end of image data from IP Kamera 9060
+while (!stbi__at_eof(j->s)) {
+int x = stbi__get8(j->s);
+if (x == 255) {
+j->marker = stbi__get8(j->s);
+break;
+} else if (x != 0) {
+return stbi__err("junk before marker", "Corrupt JPEG");
+}
+}
+// if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
+}
+} else {
+if (!stbi__process_marker(j, m)) return 0;
+}
+m = stbi__get_marker(j);
+}
+if (j->progressive)
+stbi__jpeg_finish(j);
+return 1;
+}
+// static jfif-centered resampling (across block boundaries)
+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
+int w, int hs);
+#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+STBI_NOTUSED(out);
+STBI_NOTUSED(in_far);
+STBI_NOTUSED(w);
+STBI_NOTUSED(hs);
+return in_near;
+}
+static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+// need to generate two samples vertically for every one in input
+int i;
+STBI_NOTUSED(hs);
+for (i=0; i < w; ++i)
+out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
+return out;
+}
+static stbi_uc*  stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+// need to generate two samples horizontally for every one in input
+int i;
+stbi_uc *input = in_near;
+if (w == 1) {
+// if only one sample, can't do any interpolation
+out[0] = out[1] = input[0];
+return out;
+}
+out[0] = input[0];
+out[1] = stbi__div4(input[0]*3 + input[1] + 2);
+for (i=1; i < w-1; ++i) {
+int n = 3*input[i]+2;
+out[i*2+0] = stbi__div4(n+input[i-1]);
+out[i*2+1] = stbi__div4(n+input[i+1]);
+}
+out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
+out[i*2+1] = input[w-1];
+STBI_NOTUSED(in_far);
+STBI_NOTUSED(hs);
+return out;
+}
+#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+// need to generate 2x2 samples for every one in input
+int i,t0,t1;
+if (w == 1) {
+out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+return out;
+}
+t1 = 3*in_near[0] + in_far[0];
+out[0] = stbi__div4(t1+2);
+for (i=1; i < w; ++i) {
+t0 = t1;
+t1 = 3*in_near[i]+in_far[i];
+out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+}
+out[w*2-1] = stbi__div4(t1+2);
+STBI_NOTUSED(hs);
+return out;
+}
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+// need to generate 2x2 samples for every one in input
+int i=0,t0,t1;
+if (w == 1) {
+out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+return out;
+}
+t1 = 3*in_near[0] + in_far[0];
+// process groups of 8 pixels for as long as we can.
+// note we can't handle the last pixel in a row in this loop
+// because we need to handle the filter boundary conditions.
+for (; i < ((w-1) & ~7); i += 8) {
+#if defined(STBI_SSE2)
+// load and perform the vertical filtering pass
+// this uses 3*x + y = 4*x + (y - x)
+__m128i zero  = _mm_setzero_si128();
+__m128i farb  = _mm_loadl_epi64((__m128i *) (in_far + i));
+__m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
+__m128i farw  = _mm_unpacklo_epi8(farb, zero);
+__m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+__m128i diff  = _mm_sub_epi16(farw, nearw);
+__m128i nears = _mm_slli_epi16(nearw, 2);
+__m128i curr  = _mm_add_epi16(nears, diff); // current row
+// horizontal filter works the same based on shifted vers of current
+// row. "prev" is current row shifted right by 1 pixel; we need to
+// insert the previous pixel value (from t1).
+// "next" is current row shifted left by 1 pixel, with first pixel
+// of next block of 8 pixels added in.
+__m128i prv0 = _mm_slli_si128(curr, 2);
+__m128i nxt0 = _mm_srli_si128(curr, 2);
+__m128i prev = _mm_insert_epi16(prv0, t1, 0);
+__m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
+// horizontal filter, polyphase implementation since it's convenient:
+// even pixels = 3*cur + prev = cur*4 + (prev - cur)
+// odd  pixels = 3*cur + next = cur*4 + (next - cur)
+// note the shared term.
+__m128i bias  = _mm_set1_epi16(8);
+__m128i curs = _mm_slli_epi16(curr, 2);
+__m128i prvd = _mm_sub_epi16(prev, curr);
+__m128i nxtd = _mm_sub_epi16(next, curr);
+__m128i curb = _mm_add_epi16(curs, bias);
+__m128i even = _mm_add_epi16(prvd, curb);
+__m128i odd  = _mm_add_epi16(nxtd, curb);
+// interleave even and odd pixels, then undo scaling.
+__m128i int0 = _mm_unpacklo_epi16(even, odd);
+__m128i int1 = _mm_unpackhi_epi16(even, odd);
+__m128i de0  = _mm_srli_epi16(int0, 4);
+__m128i de1  = _mm_srli_epi16(int1, 4);
+// pack and write output
+__m128i outv = _mm_packus_epi16(de0, de1);
+_mm_storeu_si128((__m128i *) (out + i*2), outv);
+#elif defined(STBI_NEON)
+// load and perform the vertical filtering pass
+// this uses 3*x + y = 4*x + (y - x)
+uint8x8_t farb  = vld1_u8(in_far + i);
+uint8x8_t nearb = vld1_u8(in_near + i);
+int16x8_t diff  = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+int16x8_t curr  = vaddq_s16(nears, diff); // current row
+// horizontal filter works the same based on shifted vers of current
+// row. "prev" is current row shifted right by 1 pixel; we need to
+// insert the previous pixel value (from t1).
+// "next" is current row shifted left by 1 pixel, with first pixel
+// of next block of 8 pixels added in.
+int16x8_t prv0 = vextq_s16(curr, curr, 7);
+int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
+// horizontal filter, polyphase implementation since it's convenient:
+// even pixels = 3*cur + prev = cur*4 + (prev - cur)
+// odd  pixels = 3*cur + next = cur*4 + (next - cur)
+// note the shared term.
+int16x8_t curs = vshlq_n_s16(curr, 2);
+int16x8_t prvd = vsubq_s16(prev, curr);
+int16x8_t nxtd = vsubq_s16(next, curr);
+int16x8_t even = vaddq_s16(curs, prvd);
+int16x8_t odd  = vaddq_s16(curs, nxtd);
+// undo scaling and round, then store with even/odd phases interleaved
+uint8x8x2_t o;
+o.val[0] = vqrshrun_n_s16(even, 4);
+o.val[1] = vqrshrun_n_s16(odd,  4);
+vst2_u8(out + i*2, o);
+#endif
+// "previous" value for next iter
+t1 = 3*in_near[i+7] + in_far[i+7];
+}
+t0 = t1;
+t1 = 3*in_near[i] + in_far[i];
+out[i*2] = stbi__div16(3*t1 + t0 + 8);
+for (++i; i < w; ++i) {
+t0 = t1;
+t1 = 3*in_near[i]+in_far[i];
+out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+}
+out[w*2-1] = stbi__div4(t1+2);
+STBI_NOTUSED(hs);
+return out;
+}
+#endif
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+// resample with nearest-neighbor
+int i,j;
+STBI_NOTUSED(in_far);
+for (i=0; i < w; ++i)
+for (j=0; j < hs; ++j)
+out[i*hs+j] = in_near[i];
+return out;
+}
+#ifdef STBI_JPEG_OLD
+// this is the same YCbCr-to-RGB calculation that stb_image has used
+// historically before the algorithm changes in 1.49
+#define float2fixed(x)  ((int) ((x) * 65536 + 0.5))
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+int i;
+for (i=0; i < count; ++i) {
+int y_fixed = (y[i] << 16) + 32768; // rounding
+int r,g,b;
+int cr = pcr[i] - 128;
+int cb = pcb[i] - 128;
+r = y_fixed + cr*float2fixed(1.40200f);
+g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f);
+b = y_fixed                            + cb*float2fixed(1.77200f);
+r >>= 16;
+g >>= 16;
+b >>= 16;
+if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+out[0] = (stbi_uc)r;
+out[1] = (stbi_uc)g;
+out[2] = (stbi_uc)b;
+out[3] = 255;
+out += step;
+}
+}
+#else
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define float2fixed(x)  (((int) ((x) * 4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+int i;
+for (i=0; i < count; ++i) {
+int y_fixed = (y[i] << 20) + (1<<19); // rounding
+int r,g,b;
+int cr = pcr[i] - 128;
+int cb = pcb[i] - 128;
+r = y_fixed +  cr* float2fixed(1.40200f);
+g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000);
+b = y_fixed                               +   cb* float2fixed(1.77200f);
+r >>= 20;
+g >>= 20;
+b >>= 20;
+if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+out[0] = (stbi_uc)r;
+out[1] = (stbi_uc)g;
+out[2] = (stbi_uc)b;
+out[3] = 255;
+out += step;
+}
+}
+#endif
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
+{
+int i = 0;
+#ifdef STBI_SSE2
+// step == 3 is pretty ugly on the final interleave, and i'm not convinced
+// it's useful in practice (you wouldn't use it for textures, for example).
+// so just accelerate step == 4 case.
+if (step == 4) {
+// this is a fairly straightforward implementation and not super-optimized.
+__m128i signflip  = _mm_set1_epi8(-0x80);
+__m128i cr_const0 = _mm_set1_epi16(   (short) ( 1.40200f*4096.0f+0.5f));
+__m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
+__m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
+__m128i cb_const1 = _mm_set1_epi16(   (short) ( 1.77200f*4096.0f+0.5f));
+__m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
+__m128i xw = _mm_set1_epi16(255); // alpha channel
+for (; i+7 < count; i += 8) {
+// load
+__m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
+__m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
+__m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
+__m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+__m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+// unpack to short (and left-shift cr, cb by 8)
+__m128i yw  = _mm_unpacklo_epi8(y_bias, y_bytes);
+__m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+__m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+// color transform
+__m128i yws = _mm_srli_epi16(yw, 4);
+__m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+__m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+__m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+__m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+__m128i rws = _mm_add_epi16(cr0, yws);
+__m128i gwt = _mm_add_epi16(cb0, yws);
+__m128i bws = _mm_add_epi16(yws, cb1);
+__m128i gws = _mm_add_epi16(gwt, cr1);
+// descale
+__m128i rw = _mm_srai_epi16(rws, 4);
+__m128i bw = _mm_srai_epi16(bws, 4);
+__m128i gw = _mm_srai_epi16(gws, 4);
+// back to byte, set up for transpose
+__m128i brb = _mm_packus_epi16(rw, bw);
+__m128i gxb = _mm_packus_epi16(gw, xw);
+// transpose to interleave channels
+__m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+__m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+__m128i o0 = _mm_unpacklo_epi16(t0, t1);
+__m128i o1 = _mm_unpackhi_epi16(t0, t1);
+// store
+_mm_storeu_si128((__m128i *) (out + 0), o0);
+_mm_storeu_si128((__m128i *) (out + 16), o1);
+out += 32;
+}
+}
+#endif
+#ifdef STBI_NEON
+// in this version, step=3 support would be easy to add. but is there demand?
+if (step == 4) {
+// this is a fairly straightforward implementation and not super-optimized.
+uint8x8_t signflip = vdup_n_u8(0x80);
+int16x8_t cr_const0 = vdupq_n_s16(   (short) ( 1.40200f*4096.0f+0.5f));
+int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
+int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
+int16x8_t cb_const1 = vdupq_n_s16(   (short) ( 1.77200f*4096.0f+0.5f));
+for (; i+7 < count; i += 8) {
+// load
+uint8x8_t y_bytes  = vld1_u8(y + i);
+uint8x8_t cr_bytes = vld1_u8(pcr + i);
+uint8x8_t cb_bytes = vld1_u8(pcb + i);
+int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+// expand to s16
+int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+int16x8_t crw = vshll_n_s8(cr_biased, 7);
+int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+// color transform
+int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+int16x8_t rws = vaddq_s16(yws, cr0);
+int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+int16x8_t bws = vaddq_s16(yws, cb1);
+// undo scaling, round, convert to byte
+uint8x8x4_t o;
+o.val[0] = vqrshrun_n_s16(rws, 4);
+o.val[1] = vqrshrun_n_s16(gws, 4);
+o.val[2] = vqrshrun_n_s16(bws, 4);
+o.val[3] = vdup_n_u8(255);
+// store, interleaving r/g/b/a
+vst4_u8(out, o);
+out += 8*4;
+}
+}
+#endif
+for (; i < count; ++i) {
+int y_fixed = (y[i] << 20) + (1<<19); // rounding
+int r,g,b;
+int cr = pcr[i] - 128;
+int cb = pcb[i] - 128;
+r = y_fixed + cr* float2fixed(1.40200f);
+g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000);
+b = y_fixed                             +   cb* float2fixed(1.77200f);
+r >>= 20;
+g >>= 20;
+b >>= 20;
+if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+out[0] = (stbi_uc)r;
+out[1] = (stbi_uc)g;
+out[2] = (stbi_uc)b;
+out[3] = 255;
+out += step;
+}
+}
+#endif
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg *j)
+{
+j->idct_block_kernel = stbi__idct_block;
+j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+#ifdef STBI_SSE2
+if (stbi__sse2_available()) {
+j->idct_block_kernel = stbi__idct_simd;
+#ifndef STBI_JPEG_OLD
+j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+#endif
+j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+}
+#endif
+#ifdef STBI_NEON
+j->idct_block_kernel = stbi__idct_simd;
+#ifndef STBI_JPEG_OLD
+j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+#endif
+j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg *j)
+{
+int i;
+for (i=0; i < j->s->img_n; ++i) {
+if (j->img_comp[i].raw_data) {
+STBI_FREE(j->img_comp[i].raw_data);
+j->img_comp[i].raw_data = NULL;
+j->img_comp[i].data = NULL;
+}
+if (j->img_comp[i].raw_coeff) {
+STBI_FREE(j->img_comp[i].raw_coeff);
+j->img_comp[i].raw_coeff = 0;
+j->img_comp[i].coeff = 0;
+}
+if (j->img_comp[i].linebuf) {
+STBI_FREE(j->img_comp[i].linebuf);
+j->img_comp[i].linebuf = NULL;
+}
+}
+}
+typedef struct
+{
+resample_row_func resample;
+stbi_uc *line0,*line1;
+int hs,vs;   // expansion factor in each axis
+int w_lores; // horizontal pixels pre-expansion
+int ystep;   // how far through vertical expansion we are
+int ypos;    // which pre-expansion row we're on
+} stbi__resample;
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+{
+int n, decode_n;
+z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+// validate req_comp
+if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+// load a jpeg image from whichever source, but leave in YCbCr format
+if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
+// determine actual number of components to generate
+n = req_comp ? req_comp : z->s->img_n;
+if (z->s->img_n == 3 && n < 3)
+decode_n = 1;
+else
+decode_n = z->s->img_n;
+// resample and color-convert
+{
+int k;
+unsigned int i,j;
+stbi_uc *output;
+stbi_uc *coutput[4];
+stbi__resample res_comp[4];
+for (k=0; k < decode_n; ++k) {
+stbi__resample *r = &res_comp[k];
+// allocate line buffer big enough for upsampling off the edges
+// with upsample factor of 4
+z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
+if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+r->hs      = z->img_h_max / z->img_comp[k].h;
+r->vs      = z->img_v_max / z->img_comp[k].v;
+r->ystep   = r->vs >> 1;
+r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
+r->ypos    = 0;
+r->line0   = r->line1 = z->img_comp[k].data;
+if      (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
+else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
+else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
+else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
+else                               r->resample = stbi__resample_row_generic;
+}
+// can't error after this so, this is safe
+output = (stbi_uc *) stbi__malloc(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) {
+z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+} else
+for (i=0; i < z->s->img_x; ++i) {
+out[0] = out[1] = out[2] = y[i];
+out[3] = 255; // not used if n==3
+out += n;
+}
+} else {
+stbi_uc *y = coutput[0];
+if (n == 1)
+for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
+else
+for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255;
+}
+}
+stbi__cleanup_jpeg(z);
+*out_x = z->s->img_x;
+*out_y = z->s->img_y;
+if (comp) *comp  = z->s->img_n; // report original components, not output
+return output;
+}
+}
+static unsigned char *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+stbi__jpeg j;
+j.s = s;
+stbi__setup_jpeg(&j);
+return load_jpeg_image(&j, x,y,comp,req_comp);
+}
+static int stbi__jpeg_test(stbi__context *s)
+{
+int r;
+stbi__jpeg j;
+j.s = s;
+stbi__setup_jpeg(&j);
+r = stbi__decode_jpeg_header(&j, STBI__SCAN_type);
+stbi__rewind(s);
+return r;
+}
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
+{
+if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+stbi__rewind( j->s );
+return 0;
+}
+if (x) *x = j->s->img_x;
+if (y) *y = j->s->img_y;
+if (comp) *comp = j->s->img_n;
+return 1;
+}
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
+{
+stbi__jpeg j;
+j.s = s;
+return stbi__jpeg_info_raw(&j, x, y, comp);
+}
+#endif
+// public domain zlib decode    v0.2  Sean Barrett 2006-11-18
+//    simple implementation
+//      - all input must be provided in an upfront buffer
+//      - all output is written to a single output buffer (can malloc/realloc)
+//    performance
+//      - fast huffman
+#ifndef STBI_NO_ZLIB
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS  9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK  ((1 << STBI__ZFAST_BITS) - 1)
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct
+{
+stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+stbi__uint16 firstcode[16];
+int maxcode[17];
+stbi__uint16 firstsymbol[16];
+stbi_uc  size[288];
+stbi__uint16 value[288];
+} stbi__zhuffman;
+stbi_inline static int stbi__bitreverse16(int n)
+{
+n = ((n & 0xAAAA) >>  1) | ((n & 0x5555) << 1);
+n = ((n & 0xCCCC) >>  2) | ((n & 0x3333) << 2);
+n = ((n & 0xF0F0) >>  4) | ((n & 0x0F0F) << 4);
+n = ((n & 0xFF00) >>  8) | ((n & 0x00FF) << 8);
+return n;
+}
+stbi_inline static int stbi__bit_reverse(int v, int bits)
+{
+STBI_ASSERT(bits <= 16);
+// to bit reverse n bits, reverse 16 and shift
+// e.g. 11 bits, bit reverse and shift away 5
+return stbi__bitreverse16(v) >> (16-bits);
+}
+static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num)
+{
+int i,k=0;
+int code, next_code[16], sizes[17];
+// DEFLATE spec for generating codes
+memset(sizes, 0, sizeof(sizes));
+memset(z->fast, 0, sizeof(z->fast));
+for (i=0; i < num; ++i)
+++sizes[sizelist[i]];
+sizes[0] = 0;
+for (i=1; i < 16; ++i)
+if (sizes[i] > (1 << i))
+return stbi__err("bad sizes", "Corrupt PNG");
+code = 0;
+for (i=1; i < 16; ++i) {
+next_code[i] = code;
+z->firstcode[i] = (stbi__uint16) code;
+z->firstsymbol[i] = (stbi__uint16) k;
+code = (code + sizes[i]);
+if (sizes[i])
+if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
+z->maxcode[i] = code << (16-i); // preshift for inner loop
+code <<= 1;
+k += sizes[i];
+}
+z->maxcode[16] = 0x10000; // sentinel
+for (i=0; i < num; ++i) {
+int s = sizelist[i];
+if (s) {
+int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
+z->size [c] = (stbi_uc     ) s;
+z->value[c] = (stbi__uint16) i;
+if (s <= STBI__ZFAST_BITS) {
+int j = stbi__bit_reverse(next_code[s],s);
+while (j < (1 << STBI__ZFAST_BITS)) {
+z->fast[j] = fastv;
+j += (1 << s);
+}
+}
+++next_code[s];
+}
+}
+return 1;
+}
+// zlib-from-memory implementation for PNG reading
+//    because PNG allows splitting the zlib stream arbitrarily,
+//    and it's annoying structurally to have PNG call ZLIB call PNG,
+//    we require PNG read all the IDATs and combine them into a single
+//    memory buffer
+typedef struct
+{
+stbi_uc *zbuffer, *zbuffer_end;
+int num_bits;
+stbi__uint32 code_buffer;
+char *zout;
+char *zout_start;
+char *zout_end;
+int   z_expandable;
+stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
+{
+if (z->zbuffer >= z->zbuffer_end) return 0;
+return *z->zbuffer++;
+}
+static void stbi__fill_bits(stbi__zbuf *z)
+{
+do {
+STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
+z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
+z->num_bits += 8;
+} while (z->num_bits <= 24);
+}
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
+{
+unsigned int k;
+if (z->num_bits < n) stbi__fill_bits(z);
+k = z->code_buffer & ((1 << n) - 1);
+z->code_buffer >>= n;
+z->num_bits -= n;
+return k;
+}
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
+{
+int b,s,k;
+// not resolved by fast table, so compute it the slow way
+// use jpeg approach, which requires MSbits at top
+k = stbi__bit_reverse(a->code_buffer, 16);
+for (s=STBI__ZFAST_BITS+1; ; ++s)
+if (k < z->maxcode[s])
+break;
+if (s == 16) return -1; // invalid code!
+// code size is s, so:
+b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
+STBI_ASSERT(z->size[b] == s);
+a->code_buffer >>= s;
+a->num_bits -= s;
+return z->value[b];
+}
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
+{
+int b,s;
+if (a->num_bits < 16) stbi__fill_bits(a);
+b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+if (b) {
+s = b >> 9;
+a->code_buffer >>= s;
+a->num_bits -= s;
+return b & 511;
+}
+return stbi__zhuffman_decode_slowpath(a, z);
+}
+static int stbi__zexpand(stbi__zbuf *z, char *zout, int n)  // need to make room for n bytes
+{
+char *q;
+int cur, limit, old_limit;
+z->zout = zout;
+if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
+cur   = (int) (z->zout     - z->zout_start);
+limit = old_limit = (int) (z->zout_end - z->zout_start);
+while (cur + n > limit)
+limit *= 2;
+q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+STBI_NOTUSED(old_limit);
+if (q == NULL) return stbi__err("outofmem", "Out of memory");
+z->zout_start = q;
+z->zout       = q + cur;
+z->zout_end   = q + limit;
+return 1;
+}
+static int stbi__zlength_base[31] = {
+3,4,5,6,7,8,9,10,11,13,
+15,17,19,23,27,31,35,43,51,59,
+67,83,99,115,131,163,195,227,258,0,0 };
+static int stbi__zlength_extra[31]=
+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+static int stbi__zdist_extra[32] =
+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+static int stbi__parse_huffman_block(stbi__zbuf *a)
+{
+char *zout = a->zout;
+for(;;) {
+int z = stbi__zhuffman_decode(a, &a->z_length);
+if (z < 256) {
+if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
+if (zout >= a->zout_end) {
+if (!stbi__zexpand(a, zout, 1)) return 0;
+zout = a->zout;
+}
+*zout++ = (char) z;
+} else {
+stbi_uc *p;
+int len,dist;
+if (z == 256) {
+a->zout = zout;
+return 1;
+}
+z -= 257;
+len = stbi__zlength_base[z];
+if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
+z = stbi__zhuffman_decode(a, &a->z_distance);
+if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
+dist = stbi__zdist_base[z];
+if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
+if (zout + len > a->zout_end) {
+if (!stbi__zexpand(a, zout, len)) return 0;
+zout = a->zout;
+}
+p = (stbi_uc *) (zout - dist);
+if (dist == 1) { // run of one byte; common in images.
+stbi_uc v = *p;
+if (len) { do *zout++ = v; while (--len); }
+} else {
+if (len) { do *zout++ = *p++; while (--len); }
+}
+}
+}
+}
+static int stbi__compute_huffman_codes(stbi__zbuf *a)
+{
+static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+stbi__zhuffman z_codelength;
+stbi_uc lencodes[286+32+137];//padding for maximum single op
+stbi_uc codelength_sizes[19];
+int i,n;
+int hlit  = stbi__zreceive(a,5) + 257;
+int hdist = stbi__zreceive(a,5) + 1;
+int hclen = stbi__zreceive(a,4) + 4;
+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 < hlit + hdist) {
+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 if (c == 16) {
+c = stbi__zreceive(a,2)+3;
+memset(lencodes+n, lencodes[n-1], c);
+n += c;
+} else if (c == 17) {
+c = stbi__zreceive(a,3)+3;
+memset(lencodes+n, 0, c);
+n += c;
+} else {
+STBI_ASSERT(c == 18);
+c = stbi__zreceive(a,7)+11;
+memset(lencodes+n, 0, c);
+n += c;
+}
+}
+if (n != hlit+hdist) 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_uncomperssed_block(stbi__zbuf *a)
+{
+stbi_uc header[4];
+int len,nlen,k;
+if (a->num_bits & 7)
+stbi__zreceive(a, a->num_bits & 7); // discard
+// drain the bit-packed data into header
+k = 0;
+while (a->num_bits > 0) {
+header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
+a->code_buffer >>= 8;
+a->num_bits -= 8;
+}
+STBI_ASSERT(a->num_bits == 0);
+// now fill header the normal way
+while (k < 4)
+header[k++] = stbi__zget8(a);
+len  = header[1] * 256 + header[0];
+nlen = header[3] * 256 + header[2];
+if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
+if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
+if (a->zout + len > a->zout_end)
+if (!stbi__zexpand(a, a->zout, len)) return 0;
+memcpy(a->zout, a->zbuffer, len);
+a->zbuffer += len;
+a->zout += len;
+return 1;
+}
+static int stbi__parse_zlib_header(stbi__zbuf *a)
+{
+int cmf   = stbi__zget8(a);
+int cm    = cmf & 15;
+/* int cinfo = cmf >> 4; */
+int flg   = stbi__zget8(a);
+if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
+if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
+if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
+// window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+return 1;
+}
+// @TODO: should statically initialize these for optimal thread safety
+static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32];
+static void stbi__init_zdefaults(void)
+{
+int i;   // use <= to match clearly with spec
+for (i=0; i <= 143; ++i)     stbi__zdefault_length[i]   = 8;
+for (   ; i <= 255; ++i)     stbi__zdefault_length[i]   = 9;
+for (   ; i <= 279; ++i)     stbi__zdefault_length[i]   = 7;
+for (   ; i <= 287; ++i)     stbi__zdefault_length[i]   = 8;
+for (i=0; i <=  31; ++i)     stbi__zdefault_distance[i] = 5;
+}
+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
+{
+int final, type;
+if (parse_header)
+if (!stbi__parse_zlib_header(a)) return 0;
+a->num_bits = 0;
+a->code_buffer = 0;
+do {
+final = stbi__zreceive(a,1);
+type = stbi__zreceive(a,2);
+if (type == 0) {
+if (!stbi__parse_uncomperssed_block(a)) return 0;
+} else if (type == 3) {
+return 0;
+} else {
+if (type == 1) {
+// use fixed code lengths
+if (!stbi__zdefault_distance[31]) stbi__init_zdefaults();
+if (!stbi__zbuild_huffman(&a->z_length  , stbi__zdefault_length  , 288)) return 0;
+if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance,  32)) return 0;
+} else {
+if (!stbi__compute_huffman_codes(a)) return 0;
+}
+if (!stbi__parse_huffman_block(a)) return 0;
+}
+} while (!final);
+return 1;
+}
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
+{
+a->zout_start = obuf;
+a->zout       = obuf;
+a->zout_end   = obuf + olen;
+a->z_expandable = exp;
+return stbi__parse_zlib(a, parse_header);
+}
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
+{
+stbi__zbuf a;
+char *p = (char *) stbi__malloc(initial_size);
+if (p == NULL) return NULL;
+a.zbuffer = (stbi_uc *) buffer;
+a.zbuffer_end = (stbi_uc *) buffer + len;
+if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+if (outlen) *outlen = (int) (a.zout - a.zout_start);
+return a.zout_start;
+} else {
+STBI_FREE(a.zout_start);
+return NULL;
+}
+}
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+{
+return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+{
+stbi__zbuf a;
+char *p = (char *) stbi__malloc(initial_size);
+if (p == NULL) return NULL;
+a.zbuffer = (stbi_uc *) buffer;
+a.zbuffer_end = (stbi_uc *) buffer + len;
+if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+if (outlen) *outlen = (int) (a.zout - a.zout_start);
+return a.zout_start;
+} else {
+STBI_FREE(a.zout_start);
+return NULL;
+}
+}
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+{
+stbi__zbuf a;
+a.zbuffer = (stbi_uc *) ibuffer;
+a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+return (int) (a.zout - a.zout_start);
+else
+return -1;
+}
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+{
+stbi__zbuf a;
+char *p = (char *) stbi__malloc(16384);
+if (p == NULL) return NULL;
+a.zbuffer = (stbi_uc *) buffer;
+a.zbuffer_end = (stbi_uc *) buffer+len;
+if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+if (outlen) *outlen = (int) (a.zout - a.zout_start);
+return a.zout_start;
+} else {
+STBI_FREE(a.zout_start);
+return NULL;
+}
+}
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+{
+stbi__zbuf a;
+a.zbuffer = (stbi_uc *) ibuffer;
+a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+return (int) (a.zout - a.zout_start);
+else
+return -1;
+}
+#endif
+// public domain "baseline" PNG decoder   v0.10  Sean Barrett 2006-11-18
+//    simple implementation
+//      - only 8-bit samples
+//      - no CRC checking
+//      - allocates lots of intermediate memory
+//        - avoids problem of streaming data between subsystems
+//        - avoids explicit window management
+//    performance
+//      - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+#ifndef STBI_NO_PNG
+typedef struct
+{
+stbi__uint32 length;
+stbi__uint32 type;
+} stbi__pngchunk;
+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
+{
+stbi__pngchunk c;
+c.length = stbi__get32be(s);
+c.type   = stbi__get32be(s);
+return c;
+}
+static int stbi__check_png_header(stbi__context *s)
+{
+static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
+int i;
+for (i=0; i < 8; ++i)
+if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
+return 1;
+}
+typedef struct
+{
+stbi__context *s;
+stbi_uc *idata, *expanded, *out;
+} stbi__png;
+enum {
+STBI__F_none=0,
+STBI__F_sub=1,
+STBI__F_up=2,
+STBI__F_avg=3,
+STBI__F_paeth=4,
+// synthetic filters used for first scanline to avoid needing a dummy row of 0s
+STBI__F_avg_first,
+STBI__F_paeth_first
+};
+static stbi_uc first_row_filter[5] =
+{
+STBI__F_none,
+STBI__F_sub,
+STBI__F_none,
+STBI__F_avg_first,
+STBI__F_paeth_first
+};
+static int stbi__paeth(int a, int b, int c)
+{
+int p = a + b - c;
+int pa = abs(p-a);
+int pb = abs(p-b);
+int pc = abs(p-c);
+if (pa <= pb && pa <= pc) return a;
+if (pb <= pc) return b;
+return c;
+}
+static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
+{
+stbi__context *s = a->s;
+stbi__uint32 i,j,stride = x*out_n;
+stbi__uint32 img_len, img_width_bytes;
+int k;
+int img_n = s->img_n; // copy it into a local for later
+STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
+a->out = (stbi_uc *) stbi__malloc(x * y * out_n); // extra bytes to write off the end into
+if (!a->out) return stbi__err("outofmem", "Out of memory");
+img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+img_len = (img_width_bytes + 1) * y;
+if (s->img_x == x && s->img_y == y) {
+if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG");
+} else { // interlaced:
+if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
+}
+for (j=0; j < y; ++j) {
+stbi_uc *cur = a->out + stride*j;
+stbi_uc *prior = cur - stride;
+int filter = *raw++;
+int filter_bytes = img_n;
+int width = x;
+if (filter > 4)
+return stbi__err("invalid filter","Corrupt PNG");
+if (depth < 8) {
+STBI_ASSERT(img_width_bytes <= x);
+cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
+filter_bytes = 1;
+width = img_width_bytes;
+}
+// if first row, use special filter that doesn't sample previous row
+if (j == 0) filter = first_row_filter[filter];
+// handle first byte explicitly
+for (k=0; k < filter_bytes; ++k) {
+switch (filter) {
+case STBI__F_none       : cur[k] = raw[k]; break;
+case STBI__F_sub        : cur[k] = raw[k]; break;
+case STBI__F_up         : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+case STBI__F_avg        : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
+case STBI__F_paeth      : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
+case STBI__F_avg_first  : cur[k] = raw[k]; break;
+case STBI__F_paeth_first: cur[k] = raw[k]; break;
+}
+}
+if (depth == 8) {
+if (img_n != out_n)
+cur[img_n] = 255; // first pixel
+raw += img_n;
+cur += out_n;
+prior += out_n;
+} else {
+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)*img_n;
+#define 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;
+CASE(STBI__F_sub)          cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); 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] + cur[k-filter_bytes])>>1)); break;
+CASE(STBI__F_paeth)        cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); break;
+CASE(STBI__F_avg_first)    cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); break;
+CASE(STBI__F_paeth_first)  cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); break;
+}
+#undef CASE
+raw += nk;
+} else {
+STBI_ASSERT(img_n+1 == out_n);
+#define CASE(f) \
+case f:     \
+for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \
+for (k=0; k < img_n; ++k)
+switch (filter) {
+CASE(STBI__F_none)         cur[k] = raw[k]; break;
+CASE(STBI__F_sub)          cur[k] = STBI__BYTECAST(raw[k] + cur[k-out_n]); 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] + cur[k-out_n])>>1)); break;
+CASE(STBI__F_paeth)        cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],prior[k],prior[k-out_n])); break;
+CASE(STBI__F_avg_first)    cur[k] = STBI__BYTECAST(raw[k] + (cur[k-out_n] >> 1)); break;
+CASE(STBI__F_paeth_first)  cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],0,0)); break;
+}
+#undef CASE
+}
+}
+// 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];
+}
+}
+}
+}
+}
+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)
+{
+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(a->s->img_x * a->s->img_y * out_n);
+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_n + out_x*out_n,
+a->out + (j*x+i)*out_n, out_n);
+}
+}
+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__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(pixel_count * pal_img_n);
+if (p == NULL) return stbi__err("outofmem", "Out of memory");
+// between here and free(out) below, exitting would leak
+temp_out = p;
+if (pal_img_n == 3) {
+for (i=0; i < pixel_count; ++i) {
+int n = orig[i]*4;
+p[0] = palette[n  ];
+p[1] = palette[n+1];
+p[2] = palette[n+2];
+p += 3;
+}
+} else {
+for (i=0; i < pixel_count; ++i) {
+int n = orig[i]*4;
+p[0] = palette[n  ];
+p[1] = palette[n+1];
+p[2] = palette[n+2];
+p[3] = palette[n+3];
+p += 4;
+}
+}
+STBI_FREE(a->out);
+a->out = temp_out;
+STBI_NOTUSED(len);
+return 1;
+}
+static int stbi__unpremultiply_on_load = 0;
+static int stbi__de_iphone_flag = 0;
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+{
+stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
+}
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
+{
+stbi__de_iphone_flag = flag_true_if_should_convert;
+}
+static void stbi__de_iphone(stbi__png *z)
+{
+stbi__context *s = z->s;
+stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+stbi_uc *p = z->out;
+if (s->img_out_n == 3) {  // convert bgr to rgb
+for (i=0; i < pixel_count; ++i) {
+stbi_uc t = p[0];
+p[0] = p[2];
+p[2] = t;
+p += 3;
+}
+} else {
+STBI_ASSERT(s->img_out_n == 4);
+if (stbi__unpremultiply_on_load) {
+// convert bgr to rgb and unpremultiply
+for (i=0; i < pixel_count; ++i) {
+stbi_uc a = p[3];
+stbi_uc t = p[0];
+if (a) {
+p[0] = p[2] * 255 / a;
+p[1] = p[1] * 255 / a;
+p[2] =  t   * 255 / a;
+} else {
+p[0] = p[2];
+p[2] = t;
+}
+p += 4;
+}
+} else {
+// convert bgr to rgb
+for (i=0; i < pixel_count; ++i) {
+stbi_uc t = p[0];
+p[0] = p[2];
+p[2] = t;
+p += 4;
+}
+}
+}
+}
+#define STBI__PNG_TYPE(a,b,c,d)  (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
+{
+stbi_uc palette[1024], pal_img_n=0;
+stbi_uc has_trans=0, tc[3];
+stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
+int first=1,k,interlace=0, color=0, depth=0, is_iphone=0;
+stbi__context *s = z->s;
+z->expanded = NULL;
+z->idata = NULL;
+z->out = NULL;
+if (!stbi__check_png_header(s)) return 0;
+if (scan == STBI__SCAN_type) return 1;
+for (;;) {
+stbi__pngchunk c = stbi__get_chunk_header(s);
+switch (c.type) {
+case STBI__PNG_TYPE('C','g','B','I'):
+is_iphone = 1;
+stbi__skip(s, c.length);
+break;
+case STBI__PNG_TYPE('I','H','D','R'): {
+int comp,filter;
+if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
+first = 0;
+if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
+s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+depth = stbi__get8(s);  if (depth != 1 && depth != 2 && depth != 4 && depth != 8)  return stbi__err("1/2/4/8-bit only","PNG not supported: 1/2/4/8-bit only");
+color = stbi__get8(s);  if (color > 6)         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;
+for (k=0; k < s->img_n; ++k)
+tc[k] = (stbi_uc) (stbi__get16be(s) & 255) * stbi__depth_scale_table[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 * 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, depth, color, interlace)) return 0;
+if (has_trans)
+if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
+if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
+stbi__de_iphone(z);
+if (pal_img_n) {
+// pal_img_n == 3 or 4
+s->img_n = pal_img_n; // record the actual colors we had
+s->img_out_n = pal_img_n;
+if (req_comp >= 3) s->img_out_n = req_comp;
+if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
+return 0;
+}
+STBI_FREE(z->expanded); z->expanded = NULL;
+return 1;
+}
+default:
+// if critical, fail
+if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+if ((c.type & (1 << 29)) == 0) {
+#ifndef STBI_NO_FAILURE_STRINGS
+// not threadsafe
+static char invalid_chunk[] = "XXXX PNG chunk not known";
+invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+invalid_chunk[2] = STBI__BYTECAST(c.type >>  8);
+invalid_chunk[3] = STBI__BYTECAST(c.type >>  0);
+#endif
+return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+}
+stbi__skip(s, c.length);
+break;
+}
+// end of PNG chunk, read and skip CRC
+stbi__get32be(s);
+}
+}
+static unsigned char *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp)
+{
+unsigned char *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)) {
+result = p->out;
+p->out = NULL;
+if (req_comp && req_comp != p->s->img_out_n) {
+result = stbi__convert_format(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_out_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 unsigned char *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+stbi__png p;
+p.s = s;
+return stbi__do_png(&p, x,y,comp,req_comp);
+}
+static int stbi__png_test(stbi__context *s)
+{
+int r;
+r = stbi__check_png_header(s);
+stbi__rewind(s);
+return r;
+}
+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
+{
+if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+stbi__rewind( p->s );
+return 0;
+}
+if (x) *x = p->s->img_x;
+if (y) *y = p->s->img_y;
+if (comp) *comp = p->s->img_n;
+return 1;
+}
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
+{
+stbi__png p;
+p.s = s;
+return stbi__png_info_raw(&p, x, y, comp);
+}
+#endif
+// Microsoft/Windows BMP image
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context *s)
+{
+int r;
+int sz;
+if (stbi__get8(s) != 'B') return 0;
+if (stbi__get8(s) != 'M') return 0;
+stbi__get32le(s); // discard filesize
+stbi__get16le(s); // discard reserved
+stbi__get16le(s); // discard reserved
+stbi__get32le(s); // discard data offset
+sz = stbi__get32le(s);
+r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+return r;
+}
+static int stbi__bmp_test(stbi__context *s)
+{
+int r = stbi__bmp_test_raw(s);
+stbi__rewind(s);
+return r;
+}
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z)
+{
+int n=0;
+if (z == 0) return -1;
+if (z >= 0x10000) n += 16, z >>= 16;
+if (z >= 0x00100) n +=  8, z >>=  8;
+if (z >= 0x00010) n +=  4, z >>=  4;
+if (z >= 0x00004) n +=  2, z >>=  2;
+if (z >= 0x00002) n +=  1, z >>=  1;
+return n;
+}
+static int stbi__bitcount(unsigned int a)
+{
+a = (a & 0x55555555) + ((a >>  1) & 0x55555555); // max 2
+a = (a & 0x33333333) + ((a >>  2) & 0x33333333); // max 4
+a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+a = (a + (a >> 8)); // max 16 per 8 bits
+a = (a + (a >> 16)); // max 32 per 8 bits
+return a & 0xff;
+}
+static int stbi__shiftsigned(int v, int shift, int bits)
+{
+int result;
+int z=0;
+if (shift < 0) v <<= -shift;
+else v >>= shift;
+result = v;
+z = bits;
+while (z < 8) {
+result += v >> z;
+z += bits;
+}
+return result;
+}
+typedef struct
+{
+int bpp, offset, hsz;
+unsigned int mr,mg,mb,ma, all_a;
+} stbi__bmp_data;
+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
+{
+int hsz;
+if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
+stbi__get32le(s); // discard filesize
+stbi__get16le(s); // discard reserved
+stbi__get16le(s); // discard reserved
+info->offset = stbi__get32le(s);
+info->hsz = hsz = stbi__get32le(s);
+if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+if (hsz == 12) {
+s->img_x = stbi__get16le(s);
+s->img_y = stbi__get16le(s);
+} else {
+s->img_x = stbi__get32le(s);
+s->img_y = stbi__get32le(s);
+}
+if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
+info->bpp = stbi__get16le(s);
+if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
+if (hsz != 12) {
+int compress = stbi__get32le(s);
+if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+stbi__get32le(s); // discard sizeof
+stbi__get32le(s); // discard hres
+stbi__get32le(s); // discard vres
+stbi__get32le(s); // discard colorsused
+stbi__get32le(s); // discard max important
+if (hsz == 40 || hsz == 56) {
+if (hsz == 56) {
+stbi__get32le(s);
+stbi__get32le(s);
+stbi__get32le(s);
+stbi__get32le(s);
+}
+if (info->bpp == 16 || info->bpp == 32) {
+info->mr = info->mg = info->mb = 0;
+if (compress == 0) {
+if (info->bpp == 32) {
+info->mr = 0xffu << 16;
+info->mg = 0xffu <<  8;
+info->mb = 0xffu <<  0;
+info->ma = 0xffu << 24;
+info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
+} else {
+info->mr = 31u << 10;
+info->mg = 31u <<  5;
+info->mb = 31u <<  0;
+}
+} else if (compress == 3) {
+info->mr = stbi__get32le(s);
+info->mg = stbi__get32le(s);
+info->mb = stbi__get32le(s);
+// not documented, but generated by photoshop and handled by mspaint
+if (info->mr == info->mg && info->mg == info->mb) {
+// ?!?!?
+return stbi__errpuc("bad BMP", "bad BMP");
+}
+} else
+return stbi__errpuc("bad BMP", "bad BMP");
+}
+} else {
+int i;
+if (hsz != 108 && hsz != 124)
+return stbi__errpuc("bad BMP", "bad BMP");
+info->mr = stbi__get32le(s);
+info->mg = stbi__get32le(s);
+info->mb = stbi__get32le(s);
+info->ma = stbi__get32le(s);
+stbi__get32le(s); // discard color space
+for (i=0; i < 12; ++i)
+stbi__get32le(s); // discard color space parameters
+if (hsz == 124) {
+stbi__get32le(s); // discard rendering intent
+stbi__get32le(s); // discard offset of profile data
+stbi__get32le(s); // discard size of profile data
+stbi__get32le(s); // discard reserved
+}
+}
+}
+return (void *) 1;
+}
+static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+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;
+info.all_a = 255;
+if (stbi__bmp_parse_header(s, &info) == NULL)
+return NULL; // error code already set
+flip_vertically = ((int) s->img_y) > 0;
+s->img_y = abs((int) s->img_y);
+mr = info.mr;
+mg = info.mg;
+mb = info.mb;
+ma = info.ma;
+all_a = info.all_a;
+if (info.hsz == 12) {
+if (info.bpp < 24)
+psize = (info.offset - 14 - 24) / 3;
+} else {
+if (info.bpp < 16)
+psize = (info.offset - 14 - info.hsz) >> 2;
+}
+s->img_n = ma ? 4 : 3;
+if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+target = req_comp;
+else
+target = s->img_n; // if they want monochrome, we'll post-convert
+out = (stbi_uc *) stbi__malloc(target * s->img_x * s->img_y);
+if (!out) return stbi__errpuc("outofmem", "Out of memory");
+if (info.bpp < 16) {
+int z=0;
+if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
+for (i=0; i < psize; ++i) {
+pal[i][2] = stbi__get8(s);
+pal[i][1] = stbi__get8(s);
+pal[i][0] = stbi__get8(s);
+if (info.hsz != 12) stbi__get8(s);
+pal[i][3] = 255;
+}
+stbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+if (info.bpp == 4) width = (s->img_x + 1) >> 1;
+else if (info.bpp == 8) width = s->img_x;
+else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
+pad = (-width)&3;
+for (j=0; j < (int) s->img_y; ++j) {
+for (i=0; i < (int) s->img_x; i += 2) {
+int v=stbi__get8(s),v2=0;
+if (info.bpp == 4) {
+v2 = v & 15;
+v >>= 4;
+}
+out[z++] = pal[v][0];
+out[z++] = pal[v][1];
+out[z++] = pal[v][2];
+if (target == 4) out[z++] = 255;
+if (i+1 == (int) s->img_x) break;
+v = (info.bpp == 8) ? stbi__get8(s) : v2;
+out[z++] = pal[v][0];
+out[z++] = pal[v][1];
+out[z++] = pal[v][2];
+if (target == 4) out[z++] = 255;
+}
+stbi__skip(s, pad);
+}
+} else {
+int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
+int z = 0;
+int easy=0;
+stbi__skip(s, info.offset - 14 - info.hsz);
+if (info.bpp == 24) width = 3 * s->img_x;
+else if (info.bpp == 16) width = 2*s->img_x;
+else /* bpp = 32 and pad = 0 */ width=0;
+pad = (-width) & 3;
+if (info.bpp == 24) {
+easy = 1;
+} else if (info.bpp == 32) {
+if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+easy = 2;
+}
+if (!easy) {
+if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
+// right shift amt to put high bit in position #7
+rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
+gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
+bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
+ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
+}
+for (j=0; j < (int) s->img_y; ++j) {
+if (easy) {
+for (i=0; i < (int) s->img_x; ++i) {
+unsigned char a;
+out[z+2] = stbi__get8(s);
+out[z+1] = stbi__get8(s);
+out[z+0] = stbi__get8(s);
+z += 3;
+a = (easy == 2 ? stbi__get8(s) : 255);
+all_a |= a;
+if (target == 4) out[z++] = a;
+}
+} else {
+int bpp = info.bpp;
+for (i=0; i < (int) s->img_x; ++i) {
+stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
+int a;
+out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+all_a |= a;
+if (target == 4) out[z++] = STBI__BYTECAST(a);
+}
+}
+stbi__skip(s, pad);
+}
+}
+// if alpha channel is all 0s, replace with all 255s
+if (target == 4 && all_a == 0)
+for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
+out[i] = 255;
+if (flip_vertically) {
+stbi_uc t;
+for (j=0; j < (int) s->img_y>>1; ++j) {
+stbi_uc *p1 = out +      j     *s->img_x*target;
+stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
+for (i=0; i < (int) s->img_x*target; ++i) {
+t = p1[i], p1[i] = p2[i], p2[i] = t;
+}
+}
+}
+if (req_comp && req_comp != target) {
+out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+if (out == NULL) return out; // stbi__convert_format frees input on failure
+}
+*x = s->img_x;
+*y = s->img_y;
+if (comp) *comp = s->img_n;
+return out;
+}
+#endif
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
+{
+// only RGB or RGBA (incl. 16bit) or grey allowed
+if(is_rgb16) *is_rgb16 = 0;
+switch(bits_per_pixel) {
+case 8:  return STBI_grey;
+case 16: if(is_grey) return STBI_grey_alpha;
+// else: fall-through
+case 15: if(is_rgb16) *is_rgb16 = 1;
+return STBI_rgb;
+case 24: // fall-through
+case 32: return bits_per_pixel/8;
+default: return 0;
+}
+}
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
+{
+int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+int sz, tga_colormap_type;
+stbi__get8(s);                   // discard Offset
+tga_colormap_type = stbi__get8(s); // colormap type
+if( tga_colormap_type > 1 ) {
+stbi__rewind(s);
+return 0;      // only RGB or indexed allowed
+}
+tga_image_type = stbi__get8(s); // image type
+if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
+if (tga_image_type != 1 && tga_image_type != 9) {
+stbi__rewind(s);
+return 0;
+}
+stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+sz = stbi__get8(s);    //   check bits per palette color entry
+if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
+stbi__rewind(s);
+return 0;
+}
+stbi__skip(s,4);       // skip image x and y origin
+tga_colormap_bpp = sz;
+} else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
+if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
+stbi__rewind(s);
+return 0; // only RGB or grey allowed, +/- RLE
+}
+stbi__skip(s,9); // skip colormap specification and image x/y origin
+tga_colormap_bpp = 0;
+}
+tga_w = stbi__get16le(s);
+if( tga_w < 1 ) {
+stbi__rewind(s);
+return 0;   // test width
+}
+tga_h = stbi__get16le(s);
+if( tga_h < 1 ) {
+stbi__rewind(s);
+return 0;   // test height
+}
+tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+stbi__get8(s); // ignore alpha bits
+if (tga_colormap_bpp != 0) {
+if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+// when using a colormap, tga_bits_per_pixel is the size of the indexes
+// I don't think anything but 8 or 16bit indexes makes sense
+stbi__rewind(s);
+return 0;
+}
+tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+} else {
+tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+}
+if(!tga_comp) {
+stbi__rewind(s);
+return 0;
+}
+if (x) *x = tga_w;
+if (y) *y = tga_h;
+if (comp) *comp = tga_comp;
+return 1;                   // seems to have passed everything
+}
+static int stbi__tga_test(stbi__context *s)
+{
+int res = 0;
+int sz, tga_color_type;
+stbi__get8(s);      //   discard Offset
+tga_color_type = stbi__get8(s);   //   color type
+if ( tga_color_type > 1 ) goto errorEnd;   //   only RGB or indexed allowed
+sz = stbi__get8(s);   //   image type
+if ( tga_color_type == 1 ) { // colormapped (paletted) image
+if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
+stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+sz = stbi__get8(s);    //   check bits per palette color entry
+if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+stbi__skip(s,4);       // skip image x and y origin
+} else { // "normal" image w/o colormap
+if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
+stbi__skip(s,9); // skip colormap specification and image x/y origin
+}
+if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test width
+if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test height
+sz = stbi__get8(s);   //   bits per pixel
+if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
+if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+res = 1; // if we got this far, everything's good and we can return 1 instead of 0
+errorEnd:
+stbi__rewind(s);
+return res;
+}
+// read 16bit value and convert to 24bit RGB
+void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
+{
+stbi__uint16 px = 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] = (r * 255)/31;
+out[1] = (g * 255)/31;
+out[2] = (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 stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+//   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];
+int RLE_count = 0;
+int RLE_repeating = 0;
+int read_next_pixel = 1;
+//   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;
+tga_data = (unsigned char*)stbi__malloc( (size_t)tga_width * tga_height * tga_comp );
+if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
+// skip to the data's starting position (offset usually = 0)
+stbi__skip(s, tga_offset );
+if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
+for (i=0; i < tga_height; ++i) {
+int row = tga_inverted ? tga_height -i - 1 : i;
+stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
+stbi__getn(s, tga_row, tga_width * tga_comp);
+}
+} else  {
+//   do I need to load a palette?
+if ( tga_indexed)
+{
+//   any data to skip? (offset usually = 0)
+stbi__skip(s, tga_palette_start );
+//   load the palette
+tga_palette = (unsigned char*)stbi__malloc( tga_palette_len * tga_comp );
+if (!tga_palette) {
+STBI_FREE(tga_data);
+return stbi__errpuc("outofmem", "Out of memory");
+}
+if (tga_rgb16) {
+stbi_uc *pal_entry = tga_palette;
+STBI_ASSERT(tga_comp == STBI_rgb);
+for (i=0; i < tga_palette_len; ++i) {
+stbi__tga_read_rgb16(s, pal_entry);
+pal_entry += tga_comp;
+}
+} else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
+STBI_FREE(tga_data);
+STBI_FREE(tga_palette);
+return stbi__errpuc("bad palette", "Corrupt TGA");
+}
+}
+//   load the data
+for (i=0; i < tga_width * tga_height; ++i)
+{
+//   if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+if ( tga_is_RLE )
+{
+if ( RLE_count == 0 )
+{
+//   yep, get the next byte as a RLE command
+int RLE_cmd = stbi__get8(s);
+RLE_count = 1 + (RLE_cmd & 127);
+RLE_repeating = RLE_cmd >> 7;
+read_next_pixel = 1;
+} else if ( !RLE_repeating )
+{
+read_next_pixel = 1;
+}
+} else
+{
+read_next_pixel = 1;
+}
+//   OK, if I need to read a pixel, do it now
+if ( read_next_pixel )
+{
+//   load however much data we did have
+if ( tga_indexed )
+{
+// read in index, then perform the lookup
+int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+if ( pal_idx >= tga_palette_len ) {
+// invalid index
+pal_idx = 0;
+}
+pal_idx *= tga_comp;
+for (j = 0; j < tga_comp; ++j) {
+raw_data[j] = tga_palette[pal_idx+j];
+}
+} else if(tga_rgb16) {
+STBI_ASSERT(tga_comp == STBI_rgb);
+stbi__tga_read_rgb16(s, raw_data);
+} else {
+//   read in the data raw
+for (j = 0; j < tga_comp; ++j) {
+raw_data[j] = stbi__get8(s);
+}
+}
+//   clear the reading flag for the next pixel
+read_next_pixel = 0;
+} // end of reading a pixel
+// copy data
+for (j = 0; j < tga_comp; ++j)
+tga_data[i*tga_comp+j] = raw_data[j];
+//   in case we're in RLE mode, keep counting down
+--RLE_count;
+}
+//   do I need to invert the image?
+if ( tga_inverted )
+{
+for (j = 0; j*2 < tga_height; ++j)
+{
+int index1 = j * tga_width * tga_comp;
+int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+for (i = tga_width * tga_comp; i > 0; --i)
+{
+unsigned char temp = tga_data[index1];
+tga_data[index1] = tga_data[index2];
+tga_data[index2] = temp;
+++index1;
+++index2;
+}
+}
+}
+//   clear my palette, if I had one
+if ( tga_palette != NULL )
+{
+STBI_FREE( tga_palette );
+}
+}
+// swap RGB - if the source data was RGB16, it already is in the right order
+if (tga_comp >= 3 && !tga_rgb16)
+{
+unsigned char* tga_pixel = tga_data;
+for (i=0; i < tga_width * tga_height; ++i)
+{
+unsigned char temp = tga_pixel[0];
+tga_pixel[0] = tga_pixel[2];
+tga_pixel[2] = temp;
+tga_pixel += tga_comp;
+}
+}
+// convert to target component count
+if (req_comp && req_comp != tga_comp)
+tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+//   the things I do to get rid of an error message, and yet keep
+//   Microsoft's C compilers happy... [8^(
+tga_palette_start = tga_palette_len = tga_palette_bits =
+tga_x_origin = tga_y_origin = 0;
+//   OK, done
+return tga_data;
+}
+#endif
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s)
+{
+int r = (stbi__get32be(s) == 0x38425053);
+stbi__rewind(s);
+return r;
+}
+static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+int   pixelCount;
+int channelCount, compression;
+int channel, i, count, len;
+int bitdepth;
+int w,h;
+stbi_uc *out;
+// Check identifier
+if (stbi__get32be(s) != 0x38425053)   // "8BPS"
+return stbi__errpuc("not PSD", "Corrupt PSD image");
+// Check file type version.
+if (stbi__get16be(s) != 1)
+return stbi__errpuc("wrong version", "Unsupported version of PSD image");
+// Skip 6 reserved bytes.
+stbi__skip(s, 6 );
+// Read the number of channels (R, G, B, A, etc).
+channelCount = stbi__get16be(s);
+if (channelCount < 0 || channelCount > 16)
+return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
+// Read the rows and columns of the image.
+h = stbi__get32be(s);
+w = stbi__get32be(s);
+// Make sure the depth is 8 bits.
+bitdepth = stbi__get16be(s);
+if (bitdepth != 8 && bitdepth != 16)
+return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
+// Make sure the color mode is RGB.
+// Valid options are:
+//   0: Bitmap
+//   1: Grayscale
+//   2: Indexed color
+//   3: RGB color
+//   4: CMYK color
+//   7: Multichannel
+//   8: Duotone
+//   9: Lab color
+if (stbi__get16be(s) != 3)
+return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
+// Skip the Mode Data.  (It's the palette for indexed color; other info for other modes.)
+stbi__skip(s,stbi__get32be(s) );
+// Skip the image resources.  (resolution, pen tool paths, etc)
+stbi__skip(s, stbi__get32be(s) );
+// Skip the reserved data.
+stbi__skip(s, stbi__get32be(s) );
+// Find out if the data is compressed.
+// Known values:
+//   0: no compression
+//   1: RLE compressed
+compression = stbi__get16be(s);
+if (compression > 1)
+return stbi__errpuc("bad compression", "PSD has an unknown compression format");
+// Create the destination image.
+out = (stbi_uc *) stbi__malloc(4 * w*h);
+if (!out) return stbi__errpuc("outofmem", "Out of memory");
+pixelCount = w*h;
+// Initialize the data to zero.
+//memset( out, 0, pixelCount * 4 );
+// Finally, the image data.
+if (compression) {
+// RLE as used by .PSD and .TIFF
+// Loop until you get the number of unpacked bytes you are expecting:
+//     Read the next source byte into n.
+//     If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
+//     Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
+//     Else if n is 128, noop.
+// Endloop
+// The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
+// which we're going to just skip.
+stbi__skip(s, h * channelCount * 2 );
+// Read the RLE data by channel.
+for (channel = 0; channel < 4; channel++) {
+stbi_uc *p;
+p = out+channel;
+if (channel >= channelCount) {
+// Fill this channel with default data.
+for (i = 0; i < pixelCount; i++, p += 4)
+*p = (channel == 3 ? 255 : 0);
+} else {
+// Read the RLE data.
+count = 0;
+while (count < pixelCount) {
+len = stbi__get8(s);
+if (len == 128) {
+// No-op.
+} else if (len < 128) {
+// Copy next len+1 bytes literally.
+len++;
+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 ^= 0x0FF;
+len += 2;
+val = stbi__get8(s);
+count += len;
+while (len) {
+*p = val;
+p += 4;
+len--;
+}
+}
+}
+}
+}
+} 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 value for each pixel in the image.
+// Read the data by channel.
+for (channel = 0; channel < 4; channel++) {
+stbi_uc *p;
+p = out + channel;
+if (channel >= channelCount) {
+// Fill this channel with default data.
+stbi_uc val = channel == 3 ? 255 : 0;
+for (i = 0; i < pixelCount; i++, p += 4)
+*p = val;
+} else {
+// Read the data.
+if (bitdepth == 16) {
+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);
+}
+}
+}
+}
+if (req_comp && req_comp != 4) {
+out = stbi__convert_format(out, 4, req_comp, w, h);
+if (out == NULL) return out; // stbi__convert_format frees input on failure
+}
+if (comp) *comp = 4;
+*y = h;
+*x = w;
+return out;
+}
+#endif
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context *s,const char *str)
+{
+int i;
+for (i=0; i<4; ++i)
+if (stbi__get8(s) != (stbi_uc)str[i])
+return 0;
+return 1;
+}
+static int stbi__pic_test_core(stbi__context *s)
+{
+int i;
+if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
+return 0;
+for(i=0;i<84;++i)
+stbi__get8(s);
+if (!stbi__pic_is4(s,"PICT"))
+return 0;
+return 1;
+}
+typedef struct
+{
+stbi_uc size,type,channel;
+} stbi__pic_packet;
+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
+{
+int mask=0x80, i;
+for (i=0; i<4; ++i, mask>>=1) {
+if (channel & mask) {
+if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
+dest[i]=stbi__get8(s);
+}
+}
+return dest;
+}
+static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+{
+int mask=0x80,i;
+for (i=0;i<4; ++i, mask>>=1)
+if (channel&mask)
+dest[i]=src[i];
+}
+static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
+{
+int act_comp=0,num_packets=0,y,chained;
+stbi__pic_packet packets[10];
+// this will (should...) cater for even some bizarre stuff like having data
+// for the same channel in multiple packets.
+do {
+stbi__pic_packet *packet;
+if (num_packets==sizeof(packets)/sizeof(packets[0]))
+return stbi__errpuc("bad format","too many packets");
+packet = &packets[num_packets++];
+chained = stbi__get8(s);
+packet->size    = stbi__get8(s);
+packet->type    = stbi__get8(s);
+packet->channel = stbi__get8(s);
+act_comp |= packet->channel;
+if (stbi__at_eof(s))          return stbi__errpuc("bad file","file too short (reading packets)");
+if (packet->size != 8)  return stbi__errpuc("bad format","packet isn't 8bpp");
+} while (chained);
+*comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+for(y=0; y<height; ++y) {
+int packet_idx;
+for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
+stbi__pic_packet *packet = &packets[packet_idx];
+stbi_uc *dest = result+y*width*4;
+switch (packet->type) {
+default:
+return stbi__errpuc("bad format","packet has bad compression type");
+case 0: {//uncompressed
+int x;
+for(x=0;x<width;++x, dest+=4)
+if (!stbi__readval(s,packet->channel,dest))
+return 0;
+break;
+}
+case 1://Pure RLE
+{
+int left=width, i;
+while (left>0) {
+stbi_uc count,value[4];
+count=stbi__get8(s);
+if (stbi__at_eof(s))   return stbi__errpuc("bad file","file too short (pure read count)");
+if (count > left)
+count = (stbi_uc) left;
+if (!stbi__readval(s,packet->channel,value))  return 0;
+for(i=0; i<count; ++i,dest+=4)
+stbi__copyval(packet->channel,dest,value);
+left -= count;
+}
+}
+break;
+case 2: {//Mixed RLE
+int left=width;
+while (left>0) {
+int count = stbi__get8(s), i;
+if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (mixed read count)");
+if (count >= 128) { // Repeated
+stbi_uc value[4];
+if (count==128)
+count = stbi__get16be(s);
+else
+count -= 127;
+if (count > left)
+return stbi__errpuc("bad file","scanline overrun");
+if (!stbi__readval(s,packet->channel,value))
+return 0;
+for(i=0;i<count;++i, dest += 4)
+stbi__copyval(packet->channel,dest,value);
+} else { // Raw
+++count;
+if (count>left) return stbi__errpuc("bad file","scanline overrun");
+for(i=0;i<count;++i, dest+=4)
+if (!stbi__readval(s,packet->channel,dest))
+return 0;
+}
+left-=count;
+}
+break;
+}
+}
+}
+}
+return result;
+}
+static stbi_uc *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp)
+{
+stbi_uc *result;
+int i, x,y;
+for (i=0; i<92; ++i)
+stbi__get8(s);
+x = stbi__get16be(s);
+y = stbi__get16be(s);
+if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (pic header)");
+if ((1 << 28) / x < y) return stbi__errpuc("too large", "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(x*y*4);
+memset(result, 0xff, x*y*4);
+if (!stbi__pic_load_core(s,x,y,comp, result)) {
+STBI_FREE(result);
+result=0;
+}
+*px = x;
+*py = y;
+if (req_comp == 0) req_comp = *comp;
+result=stbi__convert_format(result,4,req_comp,x,y);
+return result;
+}
+static int stbi__pic_test(stbi__context *s)
+{
+int r = stbi__pic_test_core(s);
+stbi__rewind(s);
+return r;
+}
+#endif
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+#ifndef STBI_NO_GIF
+typedef struct
+{
+stbi__int16 prefix;
+stbi_uc first;
+stbi_uc suffix;
+} stbi__gif_lzw;
+typedef struct
+{
+int w,h;
+stbi_uc *out, *old_out;             // output buffer (always 4 components)
+int flags, bgindex, ratio, transparent, eflags, delay;
+stbi_uc  pal[256][4];
+stbi_uc lpal[256][4];
+stbi__gif_lzw codes[4096];
+stbi_uc *color_table;
+int parse, step;
+int lflags;
+int start_x, start_y;
+int max_x, max_y;
+int cur_x, cur_y;
+int line_size;
+} stbi__gif;
+static int stbi__gif_test_raw(stbi__context *s)
+{
+int sz;
+if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
+sz = stbi__get8(s);
+if (sz != '9' && sz != '7') return 0;
+if (stbi__get8(s) != 'a') return 0;
+return 1;
+}
+static int stbi__gif_test(stbi__context *s)
+{
+int r = stbi__gif_test_raw(s);
+stbi__rewind(s);
+return r;
+}
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
+{
+int i;
+for (i=0; i < num_entries; ++i) {
+pal[i][2] = stbi__get8(s);
+pal[i][1] = stbi__get8(s);
+pal[i][0] = stbi__get8(s);
+pal[i][3] = transp == i ? 0 : 255;
+}
+}
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
+{
+stbi_uc version;
+if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+return stbi__err("not GIF", "Corrupt GIF");
+version = stbi__get8(s);
+if (version != '7' && version != '9')    return stbi__err("not GIF", "Corrupt GIF");
+if (stbi__get8(s) != 'a')                return stbi__err("not GIF", "Corrupt GIF");
+stbi__g_failure_reason = "";
+g->w = stbi__get16le(s);
+g->h = stbi__get16le(s);
+g->flags = stbi__get8(s);
+g->bgindex = stbi__get8(s);
+g->ratio = stbi__get8(s);
+g->transparent = -1;
+if (comp != 0) *comp = 4;  // can't actually tell whether it's 3 or 4 until we parse the comments
+if (is_info) return 1;
+if (g->flags & 0x80)
+stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+return 1;
+}
+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
+{
+stbi__gif g;
+if (!stbi__gif_header(s, &g, comp, 1)) {
+stbi__rewind( s );
+return 0;
+}
+if (x) *x = g.w;
+if (y) *y = g.h;
+return 1;
+}
+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
+{
+stbi_uc *p, *c;
+// recurse to decode the prefixes, since the linked-list is backwards,
+// and working backwards through an interleaved image would be nasty
+if (g->codes[code].prefix >= 0)
+stbi__out_gif_code(g, g->codes[code].prefix);
+if (g->cur_y >= g->max_y) return;
+p = &g->out[g->cur_x + g->cur_y];
+c = &g->color_table[g->codes[code].suffix * 4];
+if (c[3] >= 128) {
+p[0] = c[2];
+p[1] = c[1];
+p[2] = c[0];
+p[3] = c[3];
+}
+g->cur_x += 4;
+if (g->cur_x >= g->max_x) {
+g->cur_x = g->start_x;
+g->cur_y += g->step;
+while (g->cur_y >= g->max_y && g->parse > 0) {
+g->step = (1 << g->parse) * g->line_size;
+g->cur_y = g->start_y + (g->step >> 1);
+--g->parse;
+}
+}
+}
+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
+{
+stbi_uc lzw_cs;
+stbi__int32 len, init_code;
+stbi__uint32 first;
+stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+stbi__gif_lzw *p;
+lzw_cs = stbi__get8(s);
+if (lzw_cs > 12) return NULL;
+clear = 1 << lzw_cs;
+first = 1;
+codesize = lzw_cs + 1;
+codemask = (1 << codesize) - 1;
+bits = 0;
+valid_bits = 0;
+for (init_code = 0; init_code < clear; init_code++) {
+g->codes[init_code].prefix = -1;
+g->codes[init_code].first = (stbi_uc) init_code;
+g->codes[init_code].suffix = (stbi_uc) init_code;
+}
+// support no starting clear code
+avail = clear+2;
+oldcode = -1;
+len = 0;
+for(;;) {
+if (valid_bits < codesize) {
+if (len == 0) {
+len = stbi__get8(s); // start new block
+if (len == 0)
+return g->out;
+}
+--len;
+bits |= (stbi__int32) stbi__get8(s) << valid_bits;
+valid_bits += 8;
+} else {
+stbi__int32 code = bits & codemask;
+bits >>= codesize;
+valid_bits -= codesize;
+// @OPTIMIZE: is there some way we can accelerate the non-clear path?
+if (code == clear) {  // clear code
+codesize = lzw_cs + 1;
+codemask = (1 << codesize) - 1;
+avail = clear + 2;
+oldcode = -1;
+first = 0;
+} else if (code == clear + 1) { // end of stream code
+stbi__skip(s, len);
+while ((len = stbi__get8(s)) > 0)
+stbi__skip(s,len);
+return g->out;
+} else if (code <= avail) {
+if (first) return stbi__errpuc("no clear code", "Corrupt GIF");
+if (oldcode >= 0) {
+p = &g->codes[avail++];
+if (avail > 4096)        return stbi__errpuc("too many codes", "Corrupt GIF");
+p->prefix = (stbi__int16) oldcode;
+p->first = g->codes[oldcode].first;
+p->suffix = (code == avail) ? p->first : g->codes[code].first;
+} else if (code == avail)
+return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+stbi__out_gif_code(g, (stbi__uint16) code);
+if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+codesize++;
+codemask = (1 << codesize) - 1;
+}
+oldcode = code;
+} else {
+return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+}
+}
+}
+}
+static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1)
+{
+int x, y;
+stbi_uc *c = g->pal[g->bgindex];
+for (y = y0; y < y1; y += 4 * g->w) {
+for (x = x0; x < x1; x += 4) {
+stbi_uc *p  = &g->out[y + x];
+p[0] = c[2];
+p[1] = c[1];
+p[2] = c[0];
+p[3] = 0;
+}
+}
+}
+// this function is designed to support animated gifs, although stb_image doesn't support it
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp)
+{
+int i;
+stbi_uc *prev_out = 0;
+if (g->out == 0 && !stbi__gif_header(s, g, comp,0))
+return 0; // stbi__g_failure_reason set by stbi__gif_header
+prev_out = g->out;
+g->out = (stbi_uc *) stbi__malloc(4 * g->w * g->h);
+if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory");
+switch ((g->eflags & 0x1C) >> 2) {
+case 0: // unspecified (also always used on 1st frame)
+stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h);
+break;
+case 1: // do not dispose
+if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
+g->old_out = prev_out;
+break;
+case 2: // dispose to background
+if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
+stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y);
+break;
+case 3: // dispose to previous
+if (g->old_out) {
+for (i = g->start_y; i < g->max_y; i += 4 * g->w)
+memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x);
+}
+break;
+}
+for (;;) {
+switch (stbi__get8(s)) {
+case 0x2C: /* Image Descriptor */
+{
+int prev_trans = -1;
+stbi__int32 x, y, w, h;
+stbi_uc *o;
+x = stbi__get16le(s);
+y = stbi__get16le(s);
+w = stbi__get16le(s);
+h = stbi__get16le(s);
+if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+g->line_size = g->w * 4;
+g->start_x = x * 4;
+g->start_y = y * g->line_size;
+g->max_x   = g->start_x + w * 4;
+g->max_y   = g->start_y + h * g->line_size;
+g->cur_x   = g->start_x;
+g->cur_y   = g->start_y;
+g->lflags = stbi__get8(s);
+if (g->lflags & 0x40) {
+g->step = 8 * g->line_size; // first interlaced spacing
+g->parse = 3;
+} else {
+g->step = g->line_size;
+g->parse = 0;
+}
+if (g->lflags & 0x80) {
+stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+g->color_table = (stbi_uc *) g->lpal;
+} else if (g->flags & 0x80) {
+if (g->transparent >= 0 && (g->eflags & 0x01)) {
+prev_trans = g->pal[g->transparent][3];
+g->pal[g->transparent][3] = 0;
+}
+g->color_table = (stbi_uc *) g->pal;
+} else
+return stbi__errpuc("missing color table", "Corrupt GIF");
+o = stbi__process_gif_raster(s, g);
+if (o == NULL) return NULL;
+if (prev_trans != -1)
+g->pal[g->transparent][3] = (stbi_uc) prev_trans;
+return o;
+}
+case 0x21: // Comment Extension.
+{
+int len;
+if (stbi__get8(s) == 0xF9) { // Graphic Control Extension.
+len = stbi__get8(s);
+if (len == 4) {
+g->eflags = stbi__get8(s);
+g->delay = stbi__get16le(s);
+g->transparent = stbi__get8(s);
+} else {
+stbi__skip(s, len);
+break;
+}
+}
+while ((len = stbi__get8(s)) != 0)
+stbi__skip(s, len);
+break;
+}
+case 0x3B: // gif stream termination code
+return (stbi_uc *) s; // using '1' causes warning on some compilers
+default:
+return stbi__errpuc("unknown code", "Corrupt GIF");
+}
+}
+STBI_NOTUSED(req_comp);
+}
+static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+stbi_uc *u = 0;
+stbi__gif g;
+memset(&g, 0, sizeof(g));
+u = stbi__gif_load_next(s, &g, comp, req_comp);
+if (u == (stbi_uc *) s) u = 0;  // end of animated gif marker
+if (u) {
+*x = g.w;
+*y = g.h;
+if (req_comp && req_comp != 4)
+u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+}
+else if (g.out)
+STBI_FREE(g.out);
+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 = "#?RADIANCE\n";
+int i;
+for (i=0; signature[i]; ++i)
+if (stbi__get8(s) != signature[i])
+return 0;
+return 1;
+}
+static int stbi__hdr_test(stbi__context* s)
+{
+int r = stbi__hdr_test_core(s);
+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)
+{
+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;
+// Check identifier
+if (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
+return stbi__errpf("not HDR", "Corrupt HDR image");
+// Parse header
+for(;;) {
+token = stbi__hdr_gettoken(s,buffer);
+if (token[0] == 0) break;
+if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+}
+if (!valid)    return stbi__errpf("unsupported format", "Unsupported HDR format");
+// Parse width and height
+// can't use sscanf() if we're not using stdio!
+token = stbi__hdr_gettoken(s,buffer);
+if (strncmp(token, "-Y ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+token += 3;
+height = (int) strtol(token, &token, 10);
+while (*token == ' ') ++token;
+if (strncmp(token, "+X ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+token += 3;
+width = (int) strtol(token, NULL, 10);
+*x = width;
+*y = height;
+if (comp) *comp = 3;
+if (req_comp == 0) req_comp = 3;
+// Read data
+hdr_data = (float *) stbi__malloc(height * width * req_comp * sizeof(float));
+// 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(width * 4);
+for (k = 0; k < 4; ++k) {
+i = 0;
+while (i < width) {
+count = stbi__get8(s);
+if (count > 128) {
+// Run
+value = stbi__get8(s);
+count -= 128;
+for (z = 0; z < count; ++z)
+scanline[i++ * 4 + k] = value;
+} else {
+// Dump
+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);
+}
+STBI_FREE(scanline);
+}
+return hdr_data;
+}
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
+{
+char buffer[STBI__HDR_BUFLEN];
+char *token;
+int valid = 0;
+if (stbi__hdr_test(s) == 0) {
+stbi__rewind( s );
+return 0;
+}
+for(;;) {
+token = stbi__hdr_gettoken(s,buffer);
+if (token[0] == 0) break;
+if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+}
+if (!valid) {
+stbi__rewind( s );
+return 0;
+}
+token = stbi__hdr_gettoken(s,buffer);
+if (strncmp(token, "-Y ", 3)) {
+stbi__rewind( s );
+return 0;
+}
+token += 3;
+*y = (int) strtol(token, &token, 10);
+while (*token == ' ') ++token;
+if (strncmp(token, "+X ", 3)) {
+stbi__rewind( s );
+return 0;
+}
+token += 3;
+*x = (int) strtol(token, NULL, 10);
+*comp = 3;
+return 1;
+}
+#endif // STBI_NO_HDR
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
+{
+void *p;
+stbi__bmp_data info;
+info.all_a = 255;
+p = stbi__bmp_parse_header(s, &info);
+stbi__rewind( s );
+if (p == NULL)
+return 0;
+*x = s->img_x;
+*y = s->img_y;
+*comp = info.ma ? 4 : 3;
+return 1;
+}
+#endif
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
+{
+int channelCount;
+if (stbi__get32be(s) != 0x38425053) {
+stbi__rewind( s );
+return 0;
+}
+if (stbi__get16be(s) != 1) {
+stbi__rewind( s );
+return 0;
+}
+stbi__skip(s, 6);
+channelCount = stbi__get16be(s);
+if (channelCount < 0 || channelCount > 16) {
+stbi__rewind( s );
+return 0;
+}
+*y = stbi__get32be(s);
+*x = stbi__get32be(s);
+if (stbi__get16be(s) != 8) {
+stbi__rewind( s );
+return 0;
+}
+if (stbi__get16be(s) != 3) {
+stbi__rewind( s );
+return 0;
+}
+*comp = 4;
+return 1;
+}
+#endif
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
+{
+int act_comp=0,num_packets=0,chained;
+stbi__pic_packet packets[10];
+if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
+stbi__rewind(s);
+return 0;
+}
+stbi__skip(s, 88);
+*x = stbi__get16be(s);
+*y = stbi__get16be(s);
+if (stbi__at_eof(s)) {
+stbi__rewind( s);
+return 0;
+}
+if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
+stbi__rewind( s );
+return 0;
+}
+stbi__skip(s, 8);
+do {
+stbi__pic_packet *packet;
+if (num_packets==sizeof(packets)/sizeof(packets[0]))
+return 0;
+packet = &packets[num_packets++];
+chained = stbi__get8(s);
+packet->size    = stbi__get8(s);
+packet->type    = stbi__get8(s);
+packet->channel = stbi__get8(s);
+act_comp |= packet->channel;
+if (stbi__at_eof(s)) {
+stbi__rewind( s );
+return 0;
+}
+if (packet->size != 8) {
+stbi__rewind( s );
+return 0;
+}
+} while (chained);
+*comp = (act_comp & 0x10 ? 4 : 3);
+return 1;
+}
+#endif
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+//    Does not support comments in the header section
+//    Does not support ASCII image data (formats P2 and P3)
+//    Does not support 16-bit-per-channel
+#ifndef STBI_NO_PNM
+static int      stbi__pnm_test(stbi__context *s)
+{
+char p, t;
+p = (char) stbi__get8(s);
+t = (char) stbi__get8(s);
+if (p != 'P' || (t != '5' && t != '6')) {
+stbi__rewind( s );
+return 0;
+}
+return 1;
+}
+static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+stbi_uc *out;
+if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n))
+return 0;
+*x = s->img_x;
+*y = s->img_y;
+*comp = s->img_n;
+out = (stbi_uc *) stbi__malloc(s->img_n * s->img_x * s->img_y);
+if (!out) return stbi__errpuc("outofmem", "Out of memory");
+stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+if (req_comp && req_comp != s->img_n) {
+out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+if (out == NULL) return out; // stbi__convert_format frees input on failure
+}
+return out;
+}
+static int      stbi__pnm_isspace(char c)
+{
+return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+}
+static void     stbi__pnm_skip_whitespace(stbi__context *s, char *c)
+{
+for (;;) {
+while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+*c = (char) stbi__get8(s);
+if (stbi__at_eof(s) || *c != '#')
+break;
+while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
+*c = (char) stbi__get8(s);
+}
+}
+static int      stbi__pnm_isdigit(char c)
+{
+return c >= '0' && c <= '9';
+}
+static int      stbi__pnm_getinteger(stbi__context *s, char *c)
+{
+int value = 0;
+while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+value = value*10 + (*c - '0');
+*c = (char) stbi__get8(s);
+}
+return value;
+}
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
+{
+int maxv;
+char c, p, t;
+stbi__rewind( s );
+// Get identifier
+p = (char) stbi__get8(s);
+t = (char) stbi__get8(s);
+if (p != 'P' || (t != '5' && t != '6')) {
+stbi__rewind( s );
+return 0;
+}
+*comp = (t == '6') ? 3 : 1;  // '5' is 1-component .pgm; '6' is 3-component .ppm
+c = (char) stbi__get8(s);
+stbi__pnm_skip_whitespace(s, &c);
+*x = stbi__pnm_getinteger(s, &c); // read width
+stbi__pnm_skip_whitespace(s, &c);
+*y = stbi__pnm_getinteger(s, &c); // read height
+stbi__pnm_skip_whitespace(s, &c);
+maxv = stbi__pnm_getinteger(s, &c);  // read max value
+if (maxv > 255)
+return stbi__err("max value > 255", "PPM image not 8-bit");
+else
+return 1;
+}
+#endif
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
+{
+#ifndef STBI_NO_JPEG
+if (stbi__jpeg_info(s, x, y, comp)) return 1;
+#endif
+#ifndef STBI_NO_PNG
+if (stbi__png_info(s, x, y, comp))  return 1;
+#endif
+#ifndef STBI_NO_GIF
+if (stbi__gif_info(s, x, y, comp))  return 1;
+#endif
+#ifndef STBI_NO_BMP
+if (stbi__bmp_info(s, x, y, comp))  return 1;
+#endif
+#ifndef STBI_NO_PSD
+if (stbi__psd_info(s, x, y, comp))  return 1;
+#endif
+#ifndef STBI_NO_PIC
+if (stbi__pic_info(s, x, y, comp))  return 1;
+#endif
+#ifndef STBI_NO_PNM
+if (stbi__pnm_info(s, x, y, comp))  return 1;
+#endif
+#ifndef STBI_NO_HDR
+if (stbi__hdr_info(s, x, y, comp))  return 1;
+#endif
+// test tga last because it's a crappy test!
+#ifndef STBI_NO_TGA
+if (stbi__tga_info(s, x, y, comp))
+return 1;
+#endif
+return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+}
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
+{
+FILE *f = stbi__fopen(filename, "rb");
+int result;
+if (!f) return stbi__err("can't fopen", "Unable to open file");
+result = stbi_info_from_file(f, x, y, comp);
+fclose(f);
+return result;
+}
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
+{
+int r;
+stbi__context s;
+long pos = ftell(f);
+stbi__start_file(&s, f);
+r = stbi__info_main(&s,x,y,comp);
+fseek(f,pos,SEEK_SET);
+return r;
+}
+#endif // !STBI_NO_STDIO
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+{
+stbi__context s;
+stbi__start_mem(&s,buffer,len);
+return stbi__info_main(&s,x,y,comp);
+}
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+{
+stbi__context s;
+stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+return stbi__info_main(&s,x,y,comp);
+}
+#endif // STB_IMAGE_IMPLEMENTATION
+/*
+revision history:
+2.10  (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
+*/

Mercurial > hg > pub > prymula > com

comparison DPF-Prymula-audioplugins/dpf/dgl/src/nanovg/stb_image.h @ 3:84e66ea83026