Updated NanoVG and Blendish.

3rdparty/stb_image/stb_image.c → 3rdparty/stb/stb_image.c

@@ -1,4672 +1,4647 @@
-/* stbi-1.33 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c
-   when you control the images you're loading
-                                     no warranty implied; use at your own risk
-
-   QUICK NOTES:
-      Primarily of interest to game developers and other people who can
-          avoid problematic images and only need the trivial interface
-
-      JPEG baseline (no JPEG progressive)
-      PNG 8-bit only
-
-      TGA (not sure what subset, if a subset)
-      BMP non-1bpp, non-RLE
-      PSD (composited view only, no extra channels)
-
-      GIF (*comp always reports as 4-channel)
-      HDR (radiance rgbE format)
-      PIC (Softimage PIC)
-
-      - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
-      - decode from arbitrary I/O callbacks
-      - overridable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD)
-
-   Latest revisions:
-      1.33 (2011-07-14) minor fixes suggested by Dave Moore
-      1.32 (2011-07-13) info support for all filetypes (SpartanJ)
-      1.31 (2011-06-19) a few more leak fixes, bug in PNG handling (SpartanJ)
-      1.30 (2011-06-11) added ability to load files via io callbacks (Ben Wenger)
-      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-uint8 to fix warnings (Laurent Gomila)
-                        allow trailing 0s at end of image data (Laurent Gomila)
-      1.26 (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ
-
-   See end of file for full revision history.
-
-   TODO:
-      stbi_info support for BMP,PSD,HDR,PIC
-
-
- ============================    Contributors    =========================
-              
- Image formats                                Optimizations & bugfixes
-    Sean Barrett (jpeg, png, bmp)                Fabian "ryg" Giesen
-    Nicolas Schulz (hdr, psd)                                                 
-    Jonathan Dummer (tga)                     Bug fixes & warning fixes           
-    Jean-Marc Lienher (gif)                      Marc LeBlanc               
-    Tom Seddon (pic)                             Christpher Lloyd           
-    Thatcher Ulrich (psd)                        Dave Moore                 
-                                                 Won Chun                   
-                                                 the Horde3D community      
- Extensions, features                            Janez Zemva                
-    Jetro Lauha (stbi_info)                      Jonathan Blow              
-    James "moose2000" Brown (iPhone PNG)         Laurent Gomila                             
-    Ben "Disch" Wenger (io callbacks)            Aruelien Pocheville
-    Martin "SpartanJ" Golini                     Ryamond Barbiero
-                                                 David Woo
-                                                 
-
- If your name should be here but isn't, let Sean know.
-
-*/
-
-#ifndef STBI_INCLUDE_STB_IMAGE_H
-#define STBI_INCLUDE_STB_IMAGE_H
-
-// To get a header file for this, either cut and paste the header,
-// or create stb_image.h, #define STBI_HEADER_FILE_ONLY, and
-// then include stb_image.c from it.
-
-////   begin header file  ////////////////////////////////////////////////////
-//
-// Limitations:
-//    - no jpeg progressive support
-//    - non-HDR formats support 8-bit samples only (jpeg, png)
-//    - no delayed line count (jpeg) -- IJG doesn't support either
-//    - no 1-bit BMP
-//    - GIF always returns *comp=4
-//
-// Basic usage (see HDR discussion below):
-//    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. 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 easily see if it's opaque.
-//
-// 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.
-//
-// ===========================================================================
-//
-// iPhone PNG support:
-//
-// By default we convert iphone-formatted PNGs back to RGB; nominally they
-// would silently load as BGR, except the existing code should have just
-// failed on such iPhone PNGs. But 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.
-//
-// 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).
-//
-// ===========================================================================
-//
-// 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);
-//
-// ===========================================================================
-//
-// 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).
-
-
-#ifndef STBI_NO_STDIO
-
-#if defined(_MSC_VER) && _MSC_VER >= 0x1400
-#define _CRT_SECURE_NO_WARNINGS // suppress bogus warnings about fopen()
-#endif
-
-#include <stdio.h>
-#endif
-
-#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
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// PRIMARY API - works on images of any type
-//
-
-//
-// load image by filename, open file, or memory buffer
-//
-
-extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-
-#ifndef STBI_NO_STDIO
-extern stbi_uc *stbi_load            (char const *filename,     int *x, int *y, int *comp, int req_comp);
-extern 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
-
-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,unsigned n);            // skip the next 'n' bytes
-   int      (*eof)   (void *user);                       // returns nonzero if we are at end of file/data
-} stbi_io_callbacks;
-
-extern 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_HDR
-   extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-
-   #ifndef STBI_NO_STDIO
-   extern float *stbi_loadf            (char const *filename,   int *x, int *y, int *comp, int req_comp);
-   extern float *stbi_loadf_from_file  (FILE *f,                int *x, int *y, int *comp, int req_comp);
-   #endif
-   
-   extern float *stbi_loadf_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
-
-   extern void   stbi_hdr_to_ldr_gamma(float gamma);
-   extern void   stbi_hdr_to_ldr_scale(float scale);
-
-   extern void   stbi_ldr_to_hdr_gamma(float gamma);
-   extern void   stbi_ldr_to_hdr_scale(float scale);
-#endif // STBI_NO_HDR
-
-// stbi_is_hdr is always defined
-extern int    stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
-extern int    stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
-#ifndef STBI_NO_STDIO
-extern int      stbi_is_hdr          (char const *filename);
-extern int      stbi_is_hdr_from_file(FILE *f);
-#endif // STBI_NO_STDIO
-
-
-// get a VERY brief reason for failure
-// NOT THREADSAFE
-extern const char *stbi_failure_reason  (void); 
-
-// free the loaded image -- this is just free()
-extern void     stbi_image_free      (void *retval_from_stbi_load);
-
-// get image dimensions & components without fully decoding
-extern int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
-extern int      stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
-
-#ifndef STBI_NO_STDIO
-extern int      stbi_info            (char const *filename,     int *x, int *y, int *comp);
-extern 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.
-extern 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"
-extern void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
-
-
-// ZLIB client - used by PNG, available for other purposes
-
-extern char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
-extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
-extern int   stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
-
-extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
-extern int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
-
-
-// define faster low-level operations (typically SIMD support)
-#ifdef STBI_SIMD
-typedef void (*stbi_idct_8x8)(stbi_uc *out, int out_stride, short data[64], unsigned short *dequantize);
-// compute an integer IDCT on "input"
-//     input[x] = data[x] * dequantize[x]
-//     write results to 'out': 64 samples, each run of 8 spaced by 'out_stride'
-//                             CLAMP results to 0..255
-typedef void (*stbi_YCbCr_to_RGB_run)(stbi_uc *output, stbi_uc const  *y, stbi_uc const *cb, stbi_uc const *cr, int count, int step);
-// compute a conversion from YCbCr to RGB
-//     'count' pixels
-//     write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
-//     y: Y input channel
-//     cb: Cb input channel; scale/biased to be 0..255
-//     cr: Cr input channel; scale/biased to be 0..255
-
-extern void stbi_install_idct(stbi_idct_8x8 func);
-extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
-#endif // STBI_SIMD
-
-
-#ifdef __cplusplus
-}
-#endif
-
-//
-//
-////   end header file   /////////////////////////////////////////////////////
-#endif // STBI_INCLUDE_STB_IMAGE_H
-
-#ifndef STBI_HEADER_FILE_ONLY
-
-#ifndef STBI_NO_HDR
-#include <math.h>  // ldexp
-#include <string.h> // strcmp, strtok
-#endif
-
-#ifndef STBI_NO_STDIO
-#include <stdio.h>
-#endif
-#include <stdlib.h>
-#include <memory.h>
-#include <assert.h>
-#include <stdarg.h>
-
-#ifndef _MSC_VER
-   #ifdef __cplusplus
-   #define stbi_inline inline
-   #else
-   #define stbi_inline
-   #endif
-#else
-   #define stbi_inline __forceinline
-#endif
-
-
-// implementation:
-typedef unsigned char  uint8;
-typedef unsigned short uint16;
-typedef   signed short  int16;
-typedef unsigned int   uint32;
-typedef   signed int    int32;
-typedef unsigned int   uint;
-
-// should produce compiler error if size is wrong
-typedef unsigned char validate_uint32[sizeof(uint32)==4 ? 1 : -1];
-
-#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE)
-#define STBI_NO_WRITE
-#endif
-
-#define STBI_NOTUSED(v)  (void)sizeof(v)
-
-#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
-
-///////////////////////////////////////////////
-//
-//  stbi struct and start_xxx functions
-
-// stbi structure is our basic context used by all images, so it
-// contains all the IO context, plus some basic image information
-typedef struct
-{
-   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;
-   uint8 buffer_start[128];
-
-   uint8 *img_buffer, *img_buffer_end;
-   uint8 *img_buffer_original;
-} stbi;
-
-
-static void refill_buffer(stbi *s);
-
-// initialize a memory-decode context
-static void start_mem(stbi *s, uint8 const *buffer, int len)
-{
-   s->io.read = NULL;
-   s->read_from_callbacks = 0;
-   s->img_buffer = s->img_buffer_original = (uint8 *) buffer;
-   s->img_buffer_end = (uint8 *) buffer+len;
-}
-
-// initialize a callback-based context
-static void start_callbacks(stbi *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;
-   refill_buffer(s);
-}
-
-#ifndef STBI_NO_STDIO
-
-static int stdio_read(void *user, char *data, int size)
-{
-   return (int) fread(data,1,size,(FILE*) user);
-}
-
-static void stdio_skip(void *user, unsigned n)
-{
-   fseek((FILE*) user, n, SEEK_CUR);
-}
-
-static int stdio_eof(void *user)
-{
-   return feof((FILE*) user);
-}
-
-static stbi_io_callbacks stbi_stdio_callbacks =
-{
-   stdio_read,
-   stdio_skip,
-   stdio_eof,
-};
-
-static void start_file(stbi *s, FILE *f)
-{
-   start_callbacks(s, &stbi_stdio_callbacks, (void *) f);
-}
-
-//static void stop_file(stbi *s) { }
-
-#endif // !STBI_NO_STDIO
-
-static void stbi_rewind(stbi *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;
-}
-
-static int      stbi_jpeg_test(stbi *s);
-static stbi_uc *stbi_jpeg_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_jpeg_info(stbi *s, int *x, int *y, int *comp);
-static int      stbi_png_test(stbi *s);
-static stbi_uc *stbi_png_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_png_info(stbi *s, int *x, int *y, int *comp);
-static int      stbi_bmp_test(stbi *s);
-static stbi_uc *stbi_bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_tga_test(stbi *s);
-static stbi_uc *stbi_tga_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_tga_info(stbi *s, int *x, int *y, int *comp);
-static int      stbi_psd_test(stbi *s);
-static stbi_uc *stbi_psd_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_hdr_test(stbi *s);
-static float   *stbi_hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_pic_test(stbi *s);
-static stbi_uc *stbi_pic_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_gif_test(stbi *s);
-static stbi_uc *stbi_gif_load(stbi *s, int *x, int *y, int *comp, int req_comp);
-static int      stbi_gif_info(stbi *s, int *x, int *y, int *comp);
-
-
-// this is not threadsafe
-static const char *failure_reason;
-
-const char *stbi_failure_reason(void)
-{
-   return failure_reason;
-}
-
-static int e(const char *str)
-{
-   failure_reason = str;
-   return 0;
-}
-
-// e - error
-// epf - error returning pointer to float
-// epuc - error returning pointer to unsigned char
-
-#ifdef STBI_NO_FAILURE_STRINGS
-   #define e(x,y)  0
-#elif defined(STBI_FAILURE_USERMSG)
-   #define e(x,y)  e(y)
-#else
-   #define e(x,y)  e(x)
-#endif
-
-#define epf(x,y)   ((float *) (e(x,y)?NULL:NULL))
-#define epuc(x,y)  ((unsigned char *) (e(x,y)?NULL:NULL))
-
-void stbi_image_free(void *retval_from_stbi_load)
-{
-   free(retval_from_stbi_load);
-}
-
-#ifndef STBI_NO_HDR
-static float   *ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
-static stbi_uc *hdr_to_ldr(float   *data, int x, int y, int comp);
-#endif
-
-static unsigned char *stbi_load_main(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   if (stbi_jpeg_test(s)) return stbi_jpeg_load(s,x,y,comp,req_comp);
-   if (stbi_png_test(s))  return stbi_png_load(s,x,y,comp,req_comp);
-   if (stbi_bmp_test(s))  return stbi_bmp_load(s,x,y,comp,req_comp);
-   if (stbi_gif_test(s))  return stbi_gif_load(s,x,y,comp,req_comp);
-   if (stbi_psd_test(s))  return stbi_psd_load(s,x,y,comp,req_comp);
-   if (stbi_pic_test(s))  return stbi_pic_load(s,x,y,comp,req_comp);
-
-   #ifndef STBI_NO_HDR
-   if (stbi_hdr_test(s)) {
-      float *hdr = stbi_hdr_load(s, x,y,comp,req_comp);
-      return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
-   }
-   #endif
-
-   // test tga last because it's a crappy test!
-   if (stbi_tga_test(s))
-      return stbi_tga_load(s,x,y,comp,req_comp);
-   return epuc("unknown image type", "Image not of any known type, or corrupt");
-}
-
-#ifndef STBI_NO_STDIO
-unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
-{
-   FILE *f = fopen(filename, "rb");
-   unsigned char *result;
-   if (!f) return epuc("can't fopen", "Unable to open file");
-   result = stbi_load_from_file(f,x,y,comp,req_comp);
-   fclose(f);
-   return result;
-}
-
-unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
-   stbi s;
-   start_file(&s,f);
-   return stbi_load_main(&s,x,y,comp,req_comp);
-}
-#endif //!STBI_NO_STDIO
-
-unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
-   stbi s;
-   start_mem(&s,buffer,len);
-   return stbi_load_main(&s,x,y,comp,req_comp);
-}
-
-unsigned char *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
-{
-   stbi s;
-   start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
-   return stbi_load_main(&s,x,y,comp,req_comp);
-}
-
-#ifndef STBI_NO_HDR
-
-float *stbi_loadf_main(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   unsigned char *data;
-   #ifndef STBI_NO_HDR
-   if (stbi_hdr_test(s))
-      return stbi_hdr_load(s,x,y,comp,req_comp);
-   #endif
-   data = stbi_load_main(s, x, y, comp, req_comp);
-   if (data)
-      return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
-   return epf("unknown image type", "Image not of any known type, or corrupt");
-}
-
-float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
-   stbi s;
-   start_mem(&s,buffer,len);
-   return stbi_loadf_main(&s,x,y,comp,req_comp);
-}
-
-float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
-{
-   stbi s;
-   start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
-   return stbi_loadf_main(&s,x,y,comp,req_comp);
-}
-
-#ifndef STBI_NO_STDIO
-float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
-{
-   FILE *f = fopen(filename, "rb");
-   float *result;
-   if (!f) return epf("can't fopen", "Unable to open file");
-   result = stbi_loadf_from_file(f,x,y,comp,req_comp);
-   fclose(f);
-   return result;
-}
-
-float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
-   stbi s;
-   start_file(&s,f);
-   return stbi_loadf_main(&s,x,y,comp,req_comp);
-}
-#endif // !STBI_NO_STDIO
-
-#endif // !STBI_NO_HDR
-
-// these is-hdr-or-not is defined independent of whether STBI_NO_HDR is
-// defined, for API simplicity; if STBI_NO_HDR is defined, it always
-// reports false!
-
-int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
-{
-   #ifndef STBI_NO_HDR
-   stbi s;
-   start_mem(&s,buffer,len);
-   return stbi_hdr_test(&s);
-   #else
-   STBI_NOTUSED(buffer);
-   STBI_NOTUSED(len);
-   return 0;
-   #endif
-}
-
-#ifndef STBI_NO_STDIO
-extern int      stbi_is_hdr          (char const *filename)
-{
-   FILE *f = fopen(filename, "rb");
-   int result=0;
-   if (f) {
-      result = stbi_is_hdr_from_file(f);
-      fclose(f);
-   }
-   return result;
-}
-
-extern int      stbi_is_hdr_from_file(FILE *f)
-{
-   #ifndef STBI_NO_HDR
-   stbi s;
-   start_file(&s,f);
-   return stbi_hdr_test(&s);
-   #else
-   return 0;
-   #endif
-}
-#endif // !STBI_NO_STDIO
-
-extern int      stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
-{
-   #ifndef STBI_NO_HDR
-   stbi s;
-   start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
-   return stbi_hdr_test(&s);
-   #else
-   return 0;
-   #endif
-}
-
-#ifndef STBI_NO_HDR
-static float h2l_gamma_i=1.0f/2.2f, h2l_scale_i=1.0f;
-static float l2h_gamma=2.2f, l2h_scale=1.0f;
-
-void   stbi_hdr_to_ldr_gamma(float gamma) { h2l_gamma_i = 1/gamma; }
-void   stbi_hdr_to_ldr_scale(float scale) { h2l_scale_i = 1/scale; }
-
-void   stbi_ldr_to_hdr_gamma(float gamma) { l2h_gamma = gamma; }
-void   stbi_ldr_to_hdr_scale(float scale) { l2h_scale = scale; }
-#endif
-
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// Common code used by all image loaders
-//
-
-enum
-{
-   SCAN_load=0,
-   SCAN_type,
-   SCAN_header
-};
-
-static void refill_buffer(stbi *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
-      s->read_from_callbacks = 0;
-      s->img_buffer = s->img_buffer_end-1;
-      *s->img_buffer = 0;
-   } else {
-      s->img_buffer = s->buffer_start;
-      s->img_buffer_end = s->buffer_start + n;
-   }
-}
-
-stbi_inline static int get8(stbi *s)
-{
-   if (s->img_buffer < s->img_buffer_end)
-      return *s->img_buffer++;
-   if (s->read_from_callbacks) {
-      refill_buffer(s);
-      return *s->img_buffer++;
-   }
-   return 0;
-}
-
-stbi_inline static int at_eof(stbi *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;   
-}
-
-stbi_inline static uint8 get8u(stbi *s)
-{
-   return (uint8) get8(s);
-}
-
-static void skip(stbi *s, int n)
-{
-   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 getn(stbi *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 get16(stbi *s)
-{
-   int z = get8(s);
-   return (z << 8) + get8(s);
-}
-
-static uint32 get32(stbi *s)
-{
-   uint32 z = get16(s);
-   return (z << 16) + get16(s);
-}
-
-static int get16le(stbi *s)
-{
-   int z = get8(s);
-   return z + (get8(s) << 8);
-}
-
-static uint32 get32le(stbi *s)
-{
-   uint32 z = get16le(s);
-   return z + (get16le(s) << 16);
-}
-
-//////////////////////////////////////////////////////////////////////////////
-//
-//  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 uint8 compute_y(int r, int g, int b)
-{
-   return (uint8) (((r*77) + (g*150) +  (29*b)) >> 8);
-}
-
-static unsigned char *convert_format(unsigned char *data, int img_n, int req_comp, uint x, uint y)
-{
-   int i,j;
-   unsigned char *good;
-
-   if (req_comp == img_n) return data;
-   assert(req_comp >= 1 && req_comp <= 4);
-
-   good = (unsigned char *) malloc(req_comp * x * y);
-   if (good == NULL) {
-      free(data);
-      return epuc("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]=compute_y(src[0],src[1],src[2]); break;
-         CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
-         CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
-         CASE(4,2) dest[0]=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: assert(0);
-      }
-      #undef CASE
-   }
-
-   free(data);
-   return good;
-}
-
-#ifndef STBI_NO_HDR
-static float   *ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
-{
-   int i,k,n;
-   float *output = (float *) malloc(x * y * comp * sizeof(float));
-   if (output == NULL) { free(data); return epf("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, l2h_gamma) * l2h_scale;
-      }
-      if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
-   }
-   free(data);
-   return output;
-}
-
-#define float2int(x)   ((int) (x))
-static stbi_uc *hdr_to_ldr(float   *data, int x, int y, int comp)
-{
-   int i,k,n;
-   stbi_uc *output = (stbi_uc *) malloc(x * y * comp);
-   if (output == NULL) { free(data); return epuc("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]*h2l_scale_i, h2l_gamma_i) * 255 + 0.5f;
-         if (z < 0) z = 0;
-         if (z > 255) z = 255;
-         output[i*comp + k] = (uint8) 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] = (uint8) float2int(z);
-      }
-   }
-   free(data);
-   return output;
-}
-#endif
-
-//////////////////////////////////////////////////////////////////////////////
-//
-//  "baseline" JPEG/JFIF decoder (not actually fully baseline implementation)
-//
-//    simple implementation
-//      - channel subsampling of at most 2 in each dimension
-//      - 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
-//      - uses a lot of intermediate memory, could cache poorly
-//      - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4
-//          stb_jpeg:   1.34 seconds (MSVC6, default release build)
-//          stb_jpeg:   1.06 seconds (MSVC6, processor = Pentium Pro)
-//          IJL11.dll:  1.08 seconds (compiled by intel)
-//          IJG 1998:   0.98 seconds (MSVC6, makefile provided by IJG)
-//          IJG 1998:   0.95 seconds (MSVC6, makefile + proc=PPro)
-
-// huffman decoding acceleration
-#define FAST_BITS   9  // larger handles more cases; smaller stomps less cache
-
-typedef struct
-{
-   uint8  fast[1 << FAST_BITS];
-   // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
-   uint16 code[256];
-   uint8  values[256];
-   uint8  size[257];
-   unsigned int maxcode[18];
-   int    delta[17];   // old 'firstsymbol' - old 'firstcode'
-} huffman;
-
-typedef struct
-{
-   #ifdef STBI_SIMD
-   unsigned short dequant2[4][64];
-   #endif
-   stbi *s;
-   huffman huff_dc[4];
-   huffman huff_ac[4];
-   uint8 dequant[4][64];
-
-// 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;
-      uint8 *data;
-      void *raw_data;
-      uint8 *linebuf;
-   } img_comp[4];
-
-   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 scan_n, order[4];
-   int restart_interval, todo;
-} jpeg;
-
-static int build_huffman(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++] = (uint8) (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++] = (uint16) (code++);
-         if (code-1 >= (1 << j)) return e("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] = (uint8) i;
-         }
-      }
-   }
-   return 1;
-}
-
-static void grow_buffer_unsafe(jpeg *j)
-{
-   do {
-      int b = j->nomore ? 0 : get8(j->s);
-      if (b == 0xff) {
-         int c = 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 uint32 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 decode(jpeg *j, huffman *h)
-{
-   unsigned int temp;
-   int c,k;
-
-   if (j->code_bits < 16) 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)) & bmask[k]) + h->delta[k];
-   assert((((j->code_buffer) >> (32 - h->size[c])) & 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];
-}
-
-// combined JPEG 'receive' and JPEG 'extend', since baseline
-// always extends everything it receives.
-stbi_inline static int extend_receive(jpeg *j, int n)
-{
-   unsigned int m = 1 << (n-1);
-   unsigned int k;
-   if (j->code_bits < n) grow_buffer_unsafe(j);
-
-   #if 1
-   k = stbi_lrot(j->code_buffer, n);
-   j->code_buffer = k & ~bmask[n];
-   k &= bmask[n];
-   j->code_bits -= n;
-   #else
-   k = (j->code_buffer >> (32 - n)) & bmask[n];
-   j->code_bits -= n;
-   j->code_buffer <<= n;
-   #endif
-   // the following test is probably a random branch that won't
-   // predict well. I tried to table accelerate it but failed.
-   // maybe it's compiling as a conditional move?
-   if (k < m)
-      return (-1 << n) + k + 1;
-   else
-      return k;
-}
-
-// 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 uint8 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 decode_block(jpeg *j, short data[64], huffman *hdc, huffman *hac, int b)
-{
-   int diff,dc,k;
-   int t = decode(j, hdc);
-   if (t < 0) return e("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 ? extend_receive(j, t) : 0;
-   dc = j->img_comp[b].dc_pred + diff;
-   j->img_comp[b].dc_pred = dc;
-   data[0] = (short) dc;
-
-   // decode AC components, see JPEG spec
-   k = 1;
-   do {
-      int r,s;
-      int rs = decode(j, hac);
-      if (rs < 0) return e("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
-         data[dezigzag[k++]] = (short) extend_receive(j,s);
-      }
-   } while (k < 64);
-   return 1;
-}
-
-// take a -128..127 value and clamp it and convert to 0..255
-stbi_inline static uint8 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 (uint8) x;
-}
-
-#define f2f(x)  (int) (((x) * 4096 + 0.5))
-#define fsh(x)  ((x) << 12)
-
-// derived from jidctint -- DCT_ISLOW
-#define 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) * f2f(0.5411961f);             \
-   t2 = p1 + p3*f2f(-1.847759065f);            \
-   t3 = p1 + p2*f2f( 0.765366865f);            \
-   p2 = s0;                                    \
-   p3 = s4;                                    \
-   t0 = fsh(p2+p3);                            \
-   t1 = 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)*f2f( 1.175875602f);            \
-   t0 = t0*f2f( 0.298631336f);                 \
-   t1 = t1*f2f( 2.053119869f);                 \
-   t2 = t2*f2f( 3.072711026f);                 \
-   t3 = t3*f2f( 1.501321110f);                 \
-   p1 = p5 + p1*f2f(-0.899976223f);            \
-   p2 = p5 + p2*f2f(-2.562915447f);            \
-   p3 = p3*f2f(-1.961570560f);                 \
-   p4 = p4*f2f(-0.390180644f);                 \
-   t3 += p1+p4;                                \
-   t2 += p2+p3;                                \
-   t1 += p2+p4;                                \
-   t0 += p1+p3;
-
-#ifdef STBI_SIMD
-typedef unsigned short stbi_dequantize_t;
-#else
-typedef uint8 stbi_dequantize_t;
-#endif
-
-// .344 seconds on 3*anemones.jpg
-static void idct_block(uint8 *out, int out_stride, short data[64], stbi_dequantize_t *dequantize)
-{
-   int i,val[64],*v=val;
-   stbi_dequantize_t *dq = dequantize;
-   uint8 *o;
-   short *d = data;
-
-   // columns
-   for (i=0; i < 8; ++i,++d,++dq, ++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] * dq[0] << 2;
-         v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
-      } else {
-         IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
-                 d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[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
-      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] = clamp((x0+t3) >> 17);
-      o[7] = clamp((x0-t3) >> 17);
-      o[1] = clamp((x1+t2) >> 17);
-      o[6] = clamp((x1-t2) >> 17);
-      o[2] = clamp((x2+t1) >> 17);
-      o[5] = clamp((x2-t1) >> 17);
-      o[3] = clamp((x3+t0) >> 17);
-      o[4] = clamp((x3-t0) >> 17);
-   }
-}
-
-#ifdef STBI_SIMD
-static stbi_idct_8x8 stbi_idct_installed = idct_block;
-
-void stbi_install_idct(stbi_idct_8x8 func)
-{
-   stbi_idct_installed = func;
-}
-#endif
-
-#define 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 uint8 get_marker(jpeg *j)
-{
-   uint8 x;
-   if (j->marker != MARKER_none) { x = j->marker; j->marker = MARKER_none; return x; }
-   x = get8u(j->s);
-   if (x != 0xff) return MARKER_none;
-   while (x == 0xff)
-      x = get8u(j->s);
-   return x;
-}
-
-// in each scan, we'll have scan_n components, and the order
-// of the components is specified by order[]
-#define RESTART(x)     ((x) >= 0xd0 && (x) <= 0xd7)
-
-// after a restart interval, reset the entropy decoder and
-// the dc prediction
-static void reset(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 = MARKER_none;
-   j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
-   // 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 parse_entropy_coded_data(jpeg *z)
-{
-   reset(z);
-   if (z->scan_n == 1) {
-      int i,j;
-      #ifdef STBI_SIMD
-      __declspec(align(16))
-      #endif
-      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) {
-            if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
-            #ifdef STBI_SIMD
-            stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
-            #else
-            idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
-            #endif
-            // every data block is an MCU, so countdown the restart interval
-            if (--z->todo <= 0) {
-               if (z->code_bits < 24) grow_buffer_unsafe(z);
-               // if it's NOT a restart, then just bail, so we get corrupt data
-               // rather than no data
-               if (!RESTART(z->marker)) return 1;
-               reset(z);
-            }
-         }
-      }
-   } else { // interleaved!
-      int i,j,k,x,y;
-      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;
-                     if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
-                     #ifdef STBI_SIMD
-                     stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
-                     #else
-                     idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
-                     #endif
-                  }
-               }
-            }
-            // 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) grow_buffer_unsafe(z);
-               // if it's NOT a restart, then just bail, so we get corrupt data
-               // rather than no data
-               if (!RESTART(z->marker)) return 1;
-               reset(z);
-            }
-         }
-      }
-   }
-   return 1;
-}
-
-static int process_marker(jpeg *z, int m)
-{
-   int L;
-   switch (m) {
-      case MARKER_none: // no marker found
-         return e("expected marker","Corrupt JPEG");
-
-      case 0xC2: // SOF - progressive
-         return e("progressive jpeg","JPEG format not supported (progressive)");
-
-      case 0xDD: // DRI - specify restart interval
-         if (get16(z->s) != 4) return e("bad DRI len","Corrupt JPEG");
-         z->restart_interval = get16(z->s);
-         return 1;
-
-      case 0xDB: // DQT - define quantization table
-         L = get16(z->s)-2;
-         while (L > 0) {
-            int q = get8(z->s);
-            int p = q >> 4;
-            int t = q & 15,i;
-            if (p != 0) return e("bad DQT type","Corrupt JPEG");
-            if (t > 3) return e("bad DQT table","Corrupt JPEG");
-            for (i=0; i < 64; ++i)
-               z->dequant[t][dezigzag[i]] = get8u(z->s);
-            #ifdef STBI_SIMD
-            for (i=0; i < 64; ++i)
-               z->dequant2[t][i] = z->dequant[t][i];
-            #endif
-            L -= 65;
-         }
-         return L==0;
-
-      case 0xC4: // DHT - define huffman table
-         L = get16(z->s)-2;
-         while (L > 0) {
-            uint8 *v;
-            int sizes[16],i,m=0;
-            int q = get8(z->s);
-            int tc = q >> 4;
-            int th = q & 15;
-            if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG");
-            for (i=0; i < 16; ++i) {
-               sizes[i] = get8(z->s);
-               m += sizes[i];
-            }
-            L -= 17;
-            if (tc == 0) {
-               if (!build_huffman(z->huff_dc+th, sizes)) return 0;
-               v = z->huff_dc[th].values;
-            } else {
-               if (!build_huffman(z->huff_ac+th, sizes)) return 0;
-               v = z->huff_ac[th].values;
-            }
-            for (i=0; i < m; ++i)
-               v[i] = get8u(z->s);
-            L -= m;
-         }
-         return L==0;
-   }
-   // check for comment block or APP blocks
-   if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
-      skip(z->s, get16(z->s)-2);
-      return 1;
-   }
-   return 0;
-}
-
-// after we see SOS
-static int process_scan_header(jpeg *z)
-{
-   int i;
-   int Ls = get16(z->s);
-   z->scan_n = get8(z->s);
-   if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return e("bad SOS component count","Corrupt JPEG");
-   if (Ls != 6+2*z->scan_n) return e("bad SOS len","Corrupt JPEG");
-   for (i=0; i < z->scan_n; ++i) {
-      int id = get8(z->s), which;
-      int q = 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;
-      z->img_comp[which].hd = q >> 4;   if (z->img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG");
-      z->img_comp[which].ha = q & 15;   if (z->img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG");
-      z->order[i] = which;
-   }
-   if (get8(z->s) != 0) return e("bad SOS","Corrupt JPEG");
-   get8(z->s); // should be 63, but might be 0
-   if (get8(z->s) != 0) return e("bad SOS","Corrupt JPEG");
-
-   return 1;
-}
-
-static int process_frame_header(jpeg *z, int scan)
-{
-   stbi *s = z->s;
-   int Lf,p,i,q, h_max=1,v_max=1,c;
-   Lf = get16(s);         if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG
-   p  = get8(s);          if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
-   s->img_y = get16(s);   if (s->img_y == 0) return e("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
-   s->img_x = get16(s);   if (s->img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires
-   c = get8(s);
-   if (c != 3 && c != 1) return e("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 e("bad SOF len","Corrupt JPEG");
-
-   for (i=0; i < s->img_n; ++i) {
-      z->img_comp[i].id = 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 e("bad component ID","Corrupt JPEG");
-      q = get8(s);
-      z->img_comp[i].h = (q >> 4);  if (!z->img_comp[i].h || z->img_comp[i].h > 4) return e("bad H","Corrupt JPEG");
-      z->img_comp[i].v = q & 15;    if (!z->img_comp[i].v || z->img_comp[i].v > 4) return e("bad V","Corrupt JPEG");
-      z->img_comp[i].tq = get8(s);  if (z->img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG");
-   }
-
-   if (scan != SCAN_load) return 1;
-
-   if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("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 = 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) {
-            free(z->img_comp[i].raw_data);
-            z->img_comp[i].data = NULL;
-         }
-         return e("outofmem", "Out of memory");
-      }
-      // align blocks for installable-idct using mmx/sse
-      z->img_comp[i].data = (uint8*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
-      z->img_comp[i].linebuf = NULL;
-   }
-
-   return 1;
-}
-
-// use comparisons since in some cases we handle more than one case (e.g. SOF)
-#define DNL(x)         ((x) == 0xdc)
-#define SOI(x)         ((x) == 0xd8)
-#define EOI(x)         ((x) == 0xd9)
-#define SOF(x)         ((x) == 0xc0 || (x) == 0xc1)
-#define SOS(x)         ((x) == 0xda)
-
-static int decode_jpeg_header(jpeg *z, int scan)
-{
-   int m;
-   z->marker = MARKER_none; // initialize cached marker to empty
-   m = get_marker(z);
-   if (!SOI(m)) return e("no SOI","Corrupt JPEG");
-   if (scan == SCAN_type) return 1;
-   m = get_marker(z);
-   while (!SOF(m)) {
-      if (!process_marker(z,m)) return 0;
-      m = get_marker(z);
-      while (m == MARKER_none) {
-         // some files have extra padding after their blocks, so ok, we'll scan
-         if (at_eof(z->s)) return e("no SOF", "Corrupt JPEG");
-         m = get_marker(z);
-      }
-   }
-   if (!process_frame_header(z, scan)) return 0;
-   return 1;
-}
-
-static int decode_jpeg_image(jpeg *j)
-{
-   int m;
-   j->restart_interval = 0;
-   if (!decode_jpeg_header(j, SCAN_load)) return 0;
-   m = get_marker(j);
-   while (!EOI(m)) {
-      if (SOS(m)) {
-         if (!process_scan_header(j)) return 0;
-         if (!parse_entropy_coded_data(j)) return 0;
-         if (j->marker == MARKER_none ) {
-            // handle 0s at the end of image data from IP Kamera 9060
-            while (!at_eof(j->s)) {
-               int x = get8(j->s);
-               if (x == 255) {
-                  j->marker = get8u(j->s);
-                  break;
-               } else if (x != 0) {
-                  return 0;
-               }
-            }
-            // if we reach eof without hitting a marker, get_marker() below will fail and we'll eventually return 0
-         }
-      } else {
-         if (!process_marker(j, m)) return 0;
-      }
-      m = get_marker(j);
-   }
-   return 1;
-}
-
-// static jfif-centered resampling (across block boundaries)
-
-typedef uint8 *(*resample_row_func)(uint8 *out, uint8 *in0, uint8 *in1,
-                                    int w, int hs);
-
-#define div4(x) ((uint8) ((x) >> 2))
-
-static uint8 *resample_row_1(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
-{
-   STBI_NOTUSED(out);
-   STBI_NOTUSED(in_far);
-   STBI_NOTUSED(w);
-   STBI_NOTUSED(hs);
-   return in_near;
-}
-
-static uint8* resample_row_v_2(uint8 *out, uint8 *in_near, uint8 *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] = div4(3*in_near[i] + in_far[i] + 2);
-   return out;
-}
-
-static uint8*  resample_row_h_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
-{
-   // need to generate two samples horizontally for every one in input
-   int i;
-   uint8 *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] = div4(input[0]*3 + input[1] + 2);
-   for (i=1; i < w-1; ++i) {
-      int n = 3*input[i]+2;
-      out[i*2+0] = div4(n+input[i-1]);
-      out[i*2+1] = div4(n+input[i+1]);
-   }
-   out[i*2+0] = 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 div16(x) ((uint8) ((x) >> 4))
-
-static uint8 *resample_row_hv_2(uint8 *out, uint8 *in_near, uint8 *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] = div4(3*in_near[0] + in_far[0] + 2);
-      return out;
-   }
-
-   t1 = 3*in_near[0] + in_far[0];
-   out[0] = div4(t1+2);
-   for (i=1; i < w; ++i) {
-      t0 = t1;
-      t1 = 3*in_near[i]+in_far[i];
-      out[i*2-1] = div16(3*t0 + t1 + 8);
-      out[i*2  ] = div16(3*t1 + t0 + 8);
-   }
-   out[w*2-1] = div4(t1+2);
-
-   STBI_NOTUSED(hs);
-
-   return out;
-}
-
-static uint8 *resample_row_generic(uint8 *out, uint8 *in_near, uint8 * /*in_far*/, int w, int hs)
-{
-   // resample with nearest-neighbor
-   int i,j;
-   for (i=0; i < w; ++i)
-      for (j=0; j < hs; ++j)
-         out[i*hs+j] = in_near[i];
-   return out;
-}
-
-#define float2fixed(x)  ((int) ((x) * 65536 + 0.5))
-
-// 0.38 seconds on 3*anemones.jpg   (0.25 with processor = Pro)
-// VC6 without processor=Pro is generating multiple LEAs per multiply!
-static void YCbCr_to_RGB_row(uint8 *out, const uint8 *y, const uint8 *pcb, const uint8 *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] = (uint8)r;
-      out[1] = (uint8)g;
-      out[2] = (uint8)b;
-      out[3] = 255;
-      out += step;
-   }
-}
-
-#ifdef STBI_SIMD
-static stbi_YCbCr_to_RGB_run stbi_YCbCr_installed = YCbCr_to_RGB_row;
-
-void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func)
-{
-   stbi_YCbCr_installed = func;
-}
-#endif
-
-
-// clean up the temporary component buffers
-static void cleanup_jpeg(jpeg *j)
-{
-   int i;
-   for (i=0; i < j->s->img_n; ++i) {
-      if (j->img_comp[i].data) {
-         free(j->img_comp[i].raw_data);
-         j->img_comp[i].data = NULL;
-      }
-      if (j->img_comp[i].linebuf) {
-         free(j->img_comp[i].linebuf);
-         j->img_comp[i].linebuf = NULL;
-      }
-   }
-}
-
-typedef struct
-{
-   resample_row_func resample;
-   uint8 *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 uint8 *load_jpeg_image(jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
-{
-   int n, decode_n;
-   // validate req_comp
-   if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
-   z->s->img_n = 0;
-
-   // load a jpeg image from whichever source
-   if (!decode_jpeg_image(z)) { 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;
-      uint i,j;
-      uint8 *output;
-      uint8 *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 = (uint8 *) malloc(z->s->img_x + 3);
-         if (!z->img_comp[k].linebuf) { cleanup_jpeg(z); return epuc("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 = resample_row_v_2;
-         else if (r->hs == 2 && r->vs == 1) r->resample = resample_row_h_2;
-         else if (r->hs == 2 && r->vs == 2) r->resample = resample_row_hv_2;
-         else                               r->resample = resample_row_generic;
-      }
-
-      // can't error after this so, this is safe
-      output = (uint8 *) malloc(n * z->s->img_x * z->s->img_y + 1);
-      if (!output) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }
-
-      // now go ahead and resample
-      for (j=0; j < z->s->img_y; ++j) {
-         uint8 *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) {
-            uint8 *y = coutput[0];
-            if (z->s->img_n == 3) {
-               #ifdef STBI_SIMD
-               stbi_YCbCr_installed(out, y, coutput[1], coutput[2], z->s.img_x, n);
-               #else
-               YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s->img_x, n);
-               #endif
-            } 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 {
-            uint8 *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;
-         }
-      }
-      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 *s, int *x, int *y, int *comp, int req_comp)
-{
-   jpeg j;
-   j.s = s;
-   return load_jpeg_image(&j, x,y,comp,req_comp);
-}
-
-static int stbi_jpeg_test(stbi *s)
-{
-   int r;
-   jpeg j;
-   j.s = s;
-   r = decode_jpeg_header(&j, SCAN_type);
-   stbi_rewind(s);
-   return r;
-}
-
-static int stbi_jpeg_info_raw(jpeg *j, int *x, int *y, int *comp)
-{
-   if (!decode_jpeg_header(j, 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 *s, int *x, int *y, int *comp)
-{
-   jpeg j;
-   j.s = s;
-   return stbi_jpeg_info_raw(&j, x, y, comp);
-}
-
-// 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
-
-// fast-way is faster to check than jpeg huffman, but slow way is slower
-#define ZFAST_BITS  9 // accelerate all cases in default tables
-#define ZFAST_MASK  ((1 << ZFAST_BITS) - 1)
-
-// zlib-style huffman encoding
-// (jpegs packs from left, zlib from right, so can't share code)
-typedef struct
-{
-   uint16 fast[1 << ZFAST_BITS];
-   uint16 firstcode[16];
-   int maxcode[17];
-   uint16 firstsymbol[16];
-   uint8  size[288];
-   uint16 value[288]; 
-} zhuffman;
-
-stbi_inline static int 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 bit_reverse(int v, int bits)
-{
-   assert(bits <= 16);
-   // to bit reverse n bits, reverse 16 and shift
-   // e.g. 11 bits, bit reverse and shift away 5
-   return bitreverse16(v) >> (16-bits);
-}
-
-static int zbuild_huffman(zhuffman *z, uint8 *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, 255, sizeof(z->fast));
-   for (i=0; i < num; ++i) 
-      ++sizes[sizelist[i]];
-   sizes[0] = 0;
-   for (i=1; i < 16; ++i)
-      assert(sizes[i] <= (1 << i));
-   code = 0;
-   for (i=1; i < 16; ++i) {
-      next_code[i] = code;
-      z->firstcode[i] = (uint16) code;
-      z->firstsymbol[i] = (uint16) k;
-      code = (code + sizes[i]);
-      if (sizes[i])
-         if (code-1 >= (1 << i)) return e("bad codelengths","Corrupt JPEG");
-      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];
-         z->size[c] = (uint8)s;
-         z->value[c] = (uint16)i;
-         if (s <= ZFAST_BITS) {
-            int k = bit_reverse(next_code[s],s);
-            while (k < (1 << ZFAST_BITS)) {
-               z->fast[k] = (uint16) c;
-               k += (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
-{
-   uint8 *zbuffer, *zbuffer_end;
-   int num_bits;
-   uint32 code_buffer;
-
-   char *zout;
-   char *zout_start;
-   char *zout_end;
-   int   z_expandable;
-
-   zhuffman z_length, z_distance;
-} zbuf;
-
-stbi_inline static int zget8(zbuf *z)
-{
-   if (z->zbuffer >= z->zbuffer_end) return 0;
-   return *z->zbuffer++;
-}
-
-static void fill_bits(zbuf *z)
-{
-   do {
-      assert(z->code_buffer < (1U << z->num_bits));
-      z->code_buffer |= zget8(z) << z->num_bits;
-      z->num_bits += 8;
-   } while (z->num_bits <= 24);
-}
-
-stbi_inline static unsigned int zreceive(zbuf *z, int n)
-{
-   unsigned int k;
-   if (z->num_bits < n) fill_bits(z);
-   k = z->code_buffer & ((1 << n) - 1);
-   z->code_buffer >>= n;
-   z->num_bits -= n;
-   return k;   
-}
-
-stbi_inline static int zhuffman_decode(zbuf *a, zhuffman *z)
-{
-   int b,s,k;
-   if (a->num_bits < 16) fill_bits(a);
-   b = z->fast[a->code_buffer & ZFAST_MASK];
-   if (b < 0xffff) {
-      s = z->size[b];
-      a->code_buffer >>= s;
-      a->num_bits -= s;
-      return z->value[b];
-   }
-
-   // not resolved by fast table, so compute it the slow way
-   // use jpeg approach, which requires MSbits at top
-   k = bit_reverse(a->code_buffer, 16);
-   for (s=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];
-   assert(z->size[b] == s);
-   a->code_buffer >>= s;
-   a->num_bits -= s;
-   return z->value[b];
-}
-
-static int expand(zbuf *z, int n)  // need to make room for n bytes
-{
-   char *q;
-   int cur, limit;
-   if (!z->z_expandable) return e("output buffer limit","Corrupt PNG");
-   cur   = (int) (z->zout     - z->zout_start);
-   limit = (int) (z->zout_end - z->zout_start);
-   while (cur + n > limit)
-      limit *= 2;
-   q = (char *) realloc(z->zout_start, limit);
-   if (q == NULL) return e("outofmem", "Out of memory");
-   z->zout_start = q;
-   z->zout       = q + cur;
-   z->zout_end   = q + limit;
-   return 1;
-}
-
-static int length_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 length_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 dist_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 dist_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 parse_huffman_block(zbuf *a)
-{
-   for(;;) {
-      int z = zhuffman_decode(a, &a->z_length);
-      if (z < 256) {
-         if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes
-         if (a->zout >= a->zout_end) if (!expand(a, 1)) return 0;
-         *a->zout++ = (char) z;
-      } else {
-         uint8 *p;
-         int len,dist;
-         if (z == 256) return 1;
-         z -= 257;
-         len = length_base[z];
-         if (length_extra[z]) len += zreceive(a, length_extra[z]);
-         z = zhuffman_decode(a, &a->z_distance);
-         if (z < 0) return e("bad huffman code","Corrupt PNG");
-         dist = dist_base[z];
-         if (dist_extra[z]) dist += zreceive(a, dist_extra[z]);
-         if (a->zout - a->zout_start < dist) return e("bad dist","Corrupt PNG");
-         if (a->zout + len > a->zout_end) if (!expand(a, len)) return 0;
-         p = (uint8 *) (a->zout - dist);
-         while (len--)
-            *a->zout++ = *p++;
-      }
-   }
-}
-
-static int compute_huffman_codes(zbuf *a)
-{
-   static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
-   zhuffman z_codelength;
-   uint8 lencodes[286+32+137];//padding for maximum single op
-   uint8 codelength_sizes[19];
-   int i,n;
-
-   int hlit  = zreceive(a,5) + 257;
-   int hdist = zreceive(a,5) + 1;
-   int hclen = zreceive(a,4) + 4;
-
-   memset(codelength_sizes, 0, sizeof(codelength_sizes));
-   for (i=0; i < hclen; ++i) {
-      int s = zreceive(a,3);
-      codelength_sizes[length_dezigzag[i]] = (uint8) s;
-   }
-   if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
-
-   n = 0;
-   while (n < hlit + hdist) {
-      int c = zhuffman_decode(a, &z_codelength);
-      assert(c >= 0 && c < 19);
-      if (c < 16)
-         lencodes[n++] = (uint8) c;
-      else if (c == 16) {
-         c = zreceive(a,2)+3;
-         memset(lencodes+n, lencodes[n-1], c);
-         n += c;
-      } else if (c == 17) {
-         c = zreceive(a,3)+3;
-         memset(lencodes+n, 0, c);
-         n += c;
-      } else {
-         assert(c == 18);
-         c = zreceive(a,7)+11;
-         memset(lencodes+n, 0, c);
-         n += c;
-      }
-   }
-   if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG");
-   if (!zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
-   if (!zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
-   return 1;
-}
-
-static int parse_uncompressed_block(zbuf *a)
-{
-   uint8 header[4];
-   int len,nlen,k;
-   if (a->num_bits & 7)
-      zreceive(a, a->num_bits & 7); // discard
-   // drain the bit-packed data into header
-   k = 0;
-   while (a->num_bits > 0) {
-      header[k++] = (uint8) (a->code_buffer & 255); // wtf this warns?
-      a->code_buffer >>= 8;
-      a->num_bits -= 8;
-   }
-   assert(a->num_bits == 0);
-   // now fill header the normal way
-   while (k < 4)
-      header[k++] = (uint8) zget8(a);
-   len  = header[1] * 256 + header[0];
-   nlen = header[3] * 256 + header[2];
-   if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG");
-   if (a->zbuffer + len > a->zbuffer_end) return e("read past buffer","Corrupt PNG");
-   if (a->zout + len > a->zout_end)
-      if (!expand(a, len)) return 0;
-   memcpy(a->zout, a->zbuffer, len);
-   a->zbuffer += len;
-   a->zout += len;
-   return 1;
-}
-
-static int parse_zlib_header(zbuf *a)
-{
-   int cmf   = zget8(a);
-   int cm    = cmf & 15;
-   /* int cinfo = cmf >> 4; */
-   int flg   = zget8(a);
-   if ((cmf*256+flg) % 31 != 0) return e("bad zlib header","Corrupt PNG"); // zlib spec
-   if (flg & 32) return e("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
-   if (cm != 8) return e("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 uint8 default_length[288], default_distance[32];
-static void init_defaults(void)
-{
-   int i;   // use <= to match clearly with spec
-   for (i=0; i <= 143; ++i)     default_length[i]   = 8;
-   for (   ; i <= 255; ++i)     default_length[i]   = 9;
-   for (   ; i <= 279; ++i)     default_length[i]   = 7;
-   for (   ; i <= 287; ++i)     default_length[i]   = 8;
-
-   for (i=0; i <=  31; ++i)     default_distance[i] = 5;
-}
-
-int stbi_png_partial; // a quick hack to only allow decoding some of a PNG... I should implement real streaming support instead
-static int parse_zlib(zbuf *a, int parse_header)
-{
-   int final, type;
-   if (parse_header)
-      if (!parse_zlib_header(a)) return 0;
-   a->num_bits = 0;
-   a->code_buffer = 0;
-   do {
-      final = zreceive(a,1);
-      type = zreceive(a,2);
-      if (type == 0) {
-         if (!parse_uncompressed_block(a)) return 0;
-      } else if (type == 3) {
-         return 0;
-      } else {
-         if (type == 1) {
-            // use fixed code lengths
-            if (!default_distance[31]) init_defaults();
-            if (!zbuild_huffman(&a->z_length  , default_length  , 288)) return 0;
-            if (!zbuild_huffman(&a->z_distance, default_distance,  32)) return 0;
-         } else {
-            if (!compute_huffman_codes(a)) return 0;
-         }
-         if (!parse_huffman_block(a)) return 0;
-      }
-      if (stbi_png_partial && a->zout - a->zout_start > 65536)
-         break;
-   } while (!final);
-   return 1;
-}
-
-static int do_zlib(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 parse_zlib(a, parse_header);
-}
-
-char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
-{
-   zbuf a;
-   char *p = (char *) malloc(initial_size);
-   if (p == NULL) return NULL;
-   a.zbuffer = (uint8 *) buffer;
-   a.zbuffer_end = (uint8 *) buffer + len;
-   if (do_zlib(&a, p, initial_size, 1, 1)) {
-      if (outlen) *outlen = (int) (a.zout - a.zout_start);
-      return a.zout_start;
-   } else {
-      free(a.zout_start);
-      return NULL;
-   }
-}
-
-char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
-{
-   return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
-}
-
-char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
-{
-   zbuf a;
-   char *p = (char *) malloc(initial_size);
-   if (p == NULL) return NULL;
-   a.zbuffer = (uint8 *) buffer;
-   a.zbuffer_end = (uint8 *) buffer + len;
-   if (do_zlib(&a, p, initial_size, 1, parse_header)) {
-      if (outlen) *outlen = (int) (a.zout - a.zout_start);
-      return a.zout_start;
-   } else {
-      free(a.zout_start);
-      return NULL;
-   }
-}
-
-int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
-{
-   zbuf a;
-   a.zbuffer = (uint8 *) ibuffer;
-   a.zbuffer_end = (uint8 *) ibuffer + ilen;
-   if (do_zlib(&a, obuffer, olen, 0, 1))
-      return (int) (a.zout - a.zout_start);
-   else
-      return -1;
-}
-
-char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
-{
-   zbuf a;
-   char *p = (char *) malloc(16384);
-   if (p == NULL) return NULL;
-   a.zbuffer = (uint8 *) buffer;
-   a.zbuffer_end = (uint8 *) buffer+len;
-   if (do_zlib(&a, p, 16384, 1, 0)) {
-      if (outlen) *outlen = (int) (a.zout - a.zout_start);
-      return a.zout_start;
-   } else {
-      free(a.zout_start);
-      return NULL;
-   }
-}
-
-int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
-{
-   zbuf a;
-   a.zbuffer = (uint8 *) ibuffer;
-   a.zbuffer_end = (uint8 *) ibuffer + ilen;
-   if (do_zlib(&a, obuffer, olen, 0, 0))
-      return (int) (a.zout - a.zout_start);
-   else
-      return -1;
-}
-
-// 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
-
-
-typedef struct
-{
-   uint32 length;
-   uint32 type;
-} chunk;
-
-#define PNG_TYPE(a,b,c,d)  (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
-
-static chunk get_chunk_header(stbi *s)
-{
-   chunk c;
-   c.length = get32(s);
-   c.type   = get32(s);
-   return c;
-}
-
-static int check_png_header(stbi *s)
-{
-   static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 };
-   int i;
-   for (i=0; i < 8; ++i)
-      if (get8u(s) != png_sig[i]) return e("bad png sig","Not a PNG");
-   return 1;
-}
-
-typedef struct
-{
-   stbi *s;
-   uint8 *idata, *expanded, *out;
-} png;
-
-
-enum {
-   F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4,
-   F_avg_first, F_paeth_first
-};
-
-static uint8 first_row_filter[5] =
-{
-   F_none, F_sub, F_none, F_avg_first, F_paeth_first
-};
-
-static int 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;
-}
-
-// create the png data from post-deflated data
-static int create_png_image_raw(png *a, uint8 *raw, uint32 raw_len, int out_n, uint32 x, uint32 y)
-{
-   stbi *s = a->s;
-   uint32 i,j,stride = x*out_n;
-   int k;
-   int img_n = s->img_n; // copy it into a local for later
-   assert(out_n == s->img_n || out_n == s->img_n+1);
-   if (stbi_png_partial) y = 1;
-   a->out = (uint8 *) malloc(x * y * out_n);
-   if (!a->out) return e("outofmem", "Out of memory");
-   if (!stbi_png_partial) {
-      if (s->img_x == x && s->img_y == y) {
-         if (raw_len != (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG");
-      } else { // interlaced:
-         if (raw_len < (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG");
-      }
-   }
-   for (j=0; j < y; ++j) {
-      uint8 *cur = a->out + stride*j;
-      uint8 *prior = cur - stride;
-      int filter = *raw++;
-      if (filter > 4) return e("invalid filter","Corrupt PNG");
-      // if first row, use special filter that doesn't sample previous row
-      if (j == 0) filter = first_row_filter[filter];
-      // handle first pixel explicitly
-      for (k=0; k < img_n; ++k) {
-         switch (filter) {
-            case F_none       : cur[k] = raw[k]; break;
-            case F_sub        : cur[k] = raw[k]; break;
-            case F_up         : cur[k] = raw[k] + prior[k]; break;
-            case F_avg        : cur[k] = raw[k] + (prior[k]>>1); break;
-            case F_paeth      : cur[k] = (uint8) (raw[k] + paeth(0,prior[k],0)); break;
-            case F_avg_first  : cur[k] = raw[k]; break;
-            case F_paeth_first: cur[k] = raw[k]; break;
-         }
-      }
-      if (img_n != out_n) cur[img_n] = 255;
-      raw += img_n;
-      cur += out_n;
-      prior += out_n;
-      // this is a little gross, so that we don't switch per-pixel or per-component
-      if (img_n == out_n) {
-         #define CASE(f) \
-             case f:     \
-                for (i=x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_n) \
-                   for (k=0; k < img_n; ++k)
-         switch (filter) {
-            CASE(F_none)  cur[k] = raw[k]; break;
-            CASE(F_sub)   cur[k] = raw[k] + cur[k-img_n]; break;
-            CASE(F_up)    cur[k] = raw[k] + prior[k]; break;
-            CASE(F_avg)   cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break;
-            CASE(F_paeth)  cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],prior[k],prior[k-img_n])); break;
-            CASE(F_avg_first)    cur[k] = raw[k] + (cur[k-img_n] >> 1); break;
-            CASE(F_paeth_first)  cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],0,0)); break;
-         }
-         #undef CASE
-      } else {
-         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(F_none)  cur[k] = raw[k]; break;
-            CASE(F_sub)   cur[k] = raw[k] + cur[k-out_n]; break;
-            CASE(F_up)    cur[k] = raw[k] + prior[k]; break;
-            CASE(F_avg)   cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break;
-            CASE(F_paeth)  cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n])); break;
-            CASE(F_avg_first)    cur[k] = raw[k] + (cur[k-out_n] >> 1); break;
-            CASE(F_paeth_first)  cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0)); break;
-         }
-         #undef CASE
-      }
-   }
-   return 1;
-}
-
-static int create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n, int interlaced)
-{
-   uint8 *final;
-   int p;
-   int save;
-   if (!interlaced)
-      return create_png_image_raw(a, raw, raw_len, out_n, a->s->img_x, a->s->img_y);
-   save = stbi_png_partial;
-   stbi_png_partial = 0;
-
-   // de-interlacing
-   final = (uint8 *) 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) {
-         if (!create_png_image_raw(a, raw, raw_len, out_n, x, y)) {
-            free(final);
-            return 0;
-         }
-         for (j=0; j < y; ++j)
-            for (i=0; i < x; ++i)
-               memcpy(final + (j*yspc[p]+yorig[p])*a->s->img_x*out_n + (i*xspc[p]+xorig[p])*out_n,
-                      a->out + (j*x+i)*out_n, out_n);
-         free(a->out);
-         raw += (x*out_n+1)*y;
-         raw_len -= (x*out_n+1)*y;
-      }
-   }
-   a->out = final;
-
-   stbi_png_partial = save;
-   return 1;
-}
-
-static int compute_transparency(png *z, uint8 tc[3], int out_n)
-{
-   stbi *s = z->s;
-   uint32 i, pixel_count = s->img_x * s->img_y;
-   uint8 *p = z->out;
-
-   // compute color-based transparency, assuming we've
-   // already got 255 as the alpha value in the output
-   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 expand_palette(png *a, uint8 *palette, int len, int pal_img_n)
-{
-   uint32 i, pixel_count = a->s->img_x * a->s->img_y;
-   uint8 *p, *temp_out, *orig = a->out;
-
-   p = (uint8 *) malloc(pixel_count * pal_img_n);
-   if (p == NULL) return e("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;
-      }
-   }
-   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;
-
-void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
-{
-   stbi_unpremultiply_on_load = flag_true_if_should_unpremultiply;
-}
-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(png *z)
-{
-   stbi *s = z->s;
-   uint32 i, pixel_count = s->img_x * s->img_y;
-   uint8 *p = z->out;
-
-   if (s->img_out_n == 3) {  // convert bgr to rgb
-      for (i=0; i < pixel_count; ++i) {
-         uint8 t = p[0];
-         p[0] = p[2];
-         p[2] = t;
-         p += 3;
-      }
-   } else {
-      assert(s->img_out_n == 4);
-      if (stbi_unpremultiply_on_load) {
-         // convert bgr to rgb and unpremultiply
-         for (i=0; i < pixel_count; ++i) {
-            uint8 a = p[3];
-            uint8 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) {
-            uint8 t = p[0];
-            p[0] = p[2];
-            p[2] = t;
-            p += 4;
-         }
-      }
-   }
-}
-
-static int parse_png_file(png *z, int scan, int req_comp)
-{
-   uint8 palette[1024], pal_img_n=0;
-   uint8 has_trans=0, tc[3];
-   uint32 ioff=0, idata_limit=0, i, pal_len=0;
-   int first=1,k,interlace=0, iphone=0;
-   stbi *s = z->s;
-
-   z->expanded = NULL;
-   z->idata = NULL;
-   z->out = NULL;
-
-   if (!check_png_header(s)) return 0;
-
-   if (scan == SCAN_type) return 1;
-
-   for (;;) {
-      chunk c = get_chunk_header(s);
-      switch (c.type) {
-         case PNG_TYPE('C','g','B','I'):
-            iphone = stbi_de_iphone_flag;
-            skip(s, c.length);
-            break;
-         case PNG_TYPE('I','H','D','R'): {
-            int depth,color,comp,filter;
-            if (!first) return e("multiple IHDR","Corrupt PNG");
-            first = 0;
-            if (c.length != 13) return e("bad IHDR len","Corrupt PNG");
-            s->img_x = get32(s); if (s->img_x > (1 << 24)) return e("too large","Very large image (corrupt?)");
-            s->img_y = get32(s); if (s->img_y > (1 << 24)) return e("too large","Very large image (corrupt?)");
-            depth = get8(s);  if (depth != 8)        return e("8bit only","PNG not supported: 8-bit only");
-            color = get8(s);  if (color > 6)         return e("bad ctype","Corrupt PNG");
-            if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype","Corrupt PNG");
-            comp  = get8(s);  if (comp) return e("bad comp method","Corrupt PNG");
-            filter= get8(s);  if (filter) return e("bad filter method","Corrupt PNG");
-            interlace = get8(s); if (interlace>1) return e("bad interlace method","Corrupt PNG");
-            if (!s->img_x || !s->img_y) return e("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 e("too large", "Image too large to decode");
-               if (scan == 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 e("too large","Corrupt PNG");
-               // if SCAN_header, have to scan to see if we have a tRNS
-            }
-            break;
-         }
-
-         case PNG_TYPE('P','L','T','E'):  {
-            if (first) return e("first not IHDR", "Corrupt PNG");
-            if (c.length > 256*3) return e("invalid PLTE","Corrupt PNG");
-            pal_len = c.length / 3;
-            if (pal_len * 3 != c.length) return e("invalid PLTE","Corrupt PNG");
-            for (i=0; i < pal_len; ++i) {
-               palette[i*4+0] = get8u(s);
-               palette[i*4+1] = get8u(s);
-               palette[i*4+2] = get8u(s);
-               palette[i*4+3] = 255;
-            }
-            break;
-         }
-
-         case PNG_TYPE('t','R','N','S'): {
-            if (first) return e("first not IHDR", "Corrupt PNG");
-            if (z->idata) return e("tRNS after IDAT","Corrupt PNG");
-            if (pal_img_n) {
-               if (scan == SCAN_header) { s->img_n = 4; return 1; }
-               if (pal_len == 0) return e("tRNS before PLTE","Corrupt PNG");
-               if (c.length > pal_len) return e("bad tRNS len","Corrupt PNG");
-               pal_img_n = 4;
-               for (i=0; i < c.length; ++i)
-                  palette[i*4+3] = get8u(s);
-            } else {
-               if (!(s->img_n & 1)) return e("tRNS with alpha","Corrupt PNG");
-               if (c.length != (uint32) s->img_n*2) return e("bad tRNS len","Corrupt PNG");
-               has_trans = 1;
-               for (k=0; k < s->img_n; ++k)
-                  tc[k] = (uint8) get16(s); // non 8-bit images will be larger
-            }
-            break;
-         }
-
-         case PNG_TYPE('I','D','A','T'): {
-            if (first) return e("first not IHDR", "Corrupt PNG");
-            if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG");
-            if (scan == SCAN_header) { s->img_n = pal_img_n; return 1; }
-            if (ioff + c.length > idata_limit) {
-               uint8 *p;
-               if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
-               while (ioff + c.length > idata_limit)
-                  idata_limit *= 2;
-               p = (uint8 *) realloc(z->idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory");
-               z->idata = p;
-            }
-            if (!getn(s, z->idata+ioff,c.length)) return e("outofdata","Corrupt PNG");
-            ioff += c.length;
-            break;
-         }
-
-         case PNG_TYPE('I','E','N','D'): {
-            uint32 raw_len;
-            if (first) return e("first not IHDR", "Corrupt PNG");
-            if (scan != SCAN_load) return 1;
-            if (z->idata == NULL) return e("no IDAT","Corrupt PNG");
-            z->expanded = (uint8 *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, 16384, (int *) &raw_len, !iphone);
-            if (z->expanded == NULL) return 0; // zlib should set error
-            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 (!create_png_image(z, z->expanded, raw_len, s->img_out_n, interlace)) return 0;
-            if (has_trans)
-               if (!compute_transparency(z, tc, s->img_out_n)) return 0;
-            if (iphone && 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 (!expand_palette(z, palette, pal_len, s->img_out_n))
-                  return 0;
-            }
-            free(z->expanded); z->expanded = NULL;
-            return 1;
-         }
-
-         default:
-            // if critical, fail
-            if (first) return e("first not IHDR", "Corrupt PNG");
-            if ((c.type & (1 << 29)) == 0) {
-               #ifndef STBI_NO_FAILURE_STRINGS
-               // not threadsafe
-               static char invalid_chunk[] = "XXXX chunk not known";
-               invalid_chunk[0] = (uint8) (c.type >> 24);
-               invalid_chunk[1] = (uint8) (c.type >> 16);
-               invalid_chunk[2] = (uint8) (c.type >>  8);
-               invalid_chunk[3] = (uint8) (c.type >>  0);
-               #endif
-               return e(invalid_chunk, "PNG not supported: unknown chunk type");
-            }
-            skip(s, c.length);
-            break;
-      }
-      // end of chunk, read and skip CRC
-      get32(s);
-   }
-}
-
-static unsigned char *do_png(png *p, int *x, int *y, int *n, int req_comp)
-{
-   unsigned char *result=NULL;
-   if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
-   if (parse_png_file(p, SCAN_load, req_comp)) {
-      result = p->out;
-      p->out = NULL;
-      if (req_comp && req_comp != p->s->img_out_n) {
-         result = 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_n;
-   }
-   free(p->out);      p->out      = NULL;
-   free(p->expanded); p->expanded = NULL;
-   free(p->idata);    p->idata    = NULL;
-
-   return result;
-}
-
-static unsigned char *stbi_png_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   png p;
-   p.s = s;
-   return do_png(&p, x,y,comp,req_comp);
-}
-
-static int stbi_png_test(stbi *s)
-{
-   int r;
-   r = check_png_header(s);
-   stbi_rewind(s);
-   return r;
-}
-
-static int stbi_png_info_raw(png *p, int *x, int *y, int *comp)
-{
-   if (!parse_png_file(p, 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 *s, int *x, int *y, int *comp)
-{
-   png p;
-   p.s = s;
-   return stbi_png_info_raw(&p, x, y, comp);
-}
-
-// Microsoft/Windows BMP image
-
-static int bmp_test(stbi *s)
-{
-   int sz;
-   if (get8(s) != 'B') return 0;
-   if (get8(s) != 'M') return 0;
-   get32le(s); // discard filesize
-   get16le(s); // discard reserved
-   get16le(s); // discard reserved
-   get32le(s); // discard data offset
-   sz = get32le(s);
-   if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1;
-   return 0;
-}
-
-static int stbi_bmp_test(stbi *s)
-{
-   int r = bmp_test(s);
-   stbi_rewind(s);
-   return r;
-}
-
-
-// returns 0..31 for the highest set bit
-static int 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 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 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;
-}
-
-static stbi_uc *bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   uint8 *out;
-   unsigned int mr=0,mg=0,mb=0,ma=0;
-   stbi_uc pal[256][4];
-   int psize=0,i,j,compress=0,width;
-   int bpp, flip_vertically, pad, target, offset, hsz;
-   if (get8(s) != 'B' || get8(s) != 'M') return epuc("not BMP", "Corrupt BMP");
-   get32le(s); // discard filesize
-   get16le(s); // discard reserved
-   get16le(s); // discard reserved
-   offset = get32le(s);
-   hsz = get32le(s);
-   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown");
-   if (hsz == 12) {
-      s->img_x = get16le(s);
-      s->img_y = get16le(s);
-   } else {
-      s->img_x = get32le(s);
-      s->img_y = get32le(s);
-   }
-   if (get16le(s) != 1) return epuc("bad BMP", "bad BMP");
-   bpp = get16le(s);
-   if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit");
-   flip_vertically = ((int) s->img_y) > 0;
-   s->img_y = abs((int) s->img_y);
-   if (hsz == 12) {
-      if (bpp < 24)
-         psize = (offset - 14 - 24) / 3;
-   } else {
-      compress = get32le(s);
-      if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE");
-      get32le(s); // discard sizeof
-      get32le(s); // discard hres
-      get32le(s); // discard vres
-      get32le(s); // discard colorsused
-      get32le(s); // discard max important
-      if (hsz == 40 || hsz == 56) {
-         if (hsz == 56) {
-            get32le(s);
-            get32le(s);
-            get32le(s);
-            get32le(s);
-         }
-         if (bpp == 16 || bpp == 32) {
-            mr = mg = mb = 0;
-            if (compress == 0) {
-               if (bpp == 32) {
-                  mr = 0xffu << 16;
-                  mg = 0xffu <<  8;
-                  mb = 0xffu <<  0;
-                  ma = 0xffu << 24;
-               } else {
-                  mr = 31u << 10;
-                  mg = 31u <<  5;
-                  mb = 31u <<  0;
-               }
-            } else if (compress == 3) {
-               mr = get32le(s);
-               mg = get32le(s);
-               mb = get32le(s);
-               // not documented, but generated by photoshop and handled by mspaint
-               if (mr == mg && mg == mb) {
-                  // ?!?!?
-                  return epuc("bad BMP", "bad BMP");
-               }
-            } else
-               return epuc("bad BMP", "bad BMP");
-         }
-      } else {
-         assert(hsz == 108);
-         mr = get32le(s);
-         mg = get32le(s);
-         mb = get32le(s);
-         ma = get32le(s);
-         get32le(s); // discard color space
-         for (i=0; i < 12; ++i)
-            get32le(s); // discard color space parameters
-      }
-      if (bpp < 16)
-         psize = (offset - 14 - 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 *) malloc(target * s->img_x * s->img_y);
-   if (!out) return epuc("outofmem", "Out of memory");
-   if (bpp < 16) {
-      int z=0;
-      if (psize == 0 || psize > 256) { free(out); return epuc("invalid", "Corrupt BMP"); }
-      for (i=0; i < psize; ++i) {
-         pal[i][2] = get8u(s);
-         pal[i][1] = get8u(s);
-         pal[i][0] = get8u(s);
-         if (hsz != 12) get8(s);
-         pal[i][3] = 255;
-      }
-      skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4));
-      if (bpp == 4) width = (s->img_x + 1) >> 1;
-      else if (bpp == 8) width = s->img_x;
-      else { free(out); return epuc("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=get8(s),v2=0;
-            if (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 = (bpp == 8) ? get8(s) : v2;
-            out[z++] = pal[v][0];
-            out[z++] = pal[v][1];
-            out[z++] = pal[v][2];
-            if (target == 4) out[z++] = 255;
-         }
-         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;
-      skip(s, offset - 14 - hsz);
-      if (bpp == 24) width = 3 * s->img_x;
-      else if (bpp == 16) width = 2*s->img_x;
-      else /* bpp = 32 and pad = 0 */ width=0;
-      pad = (-width) & 3;
-      if (bpp == 24) {
-         easy = 1;
-      } else if (bpp == 32) {
-         if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
-            easy = 2;
-      }
-      if (!easy) {
-         if (!mr || !mg || !mb) { free(out); return epuc("bad masks", "Corrupt BMP"); }
-         // right shift amt to put high bit in position #7
-         rshift = high_bit(mr)-7; rcount = bitcount(mr);
-         gshift = high_bit(mg)-7; gcount = bitcount(mr);
-         bshift = high_bit(mb)-7; bcount = bitcount(mr);
-         ashift = high_bit(ma)-7; acount = bitcount(mr);
-      }
-      for (j=0; j < (int) s->img_y; ++j) {
-         if (easy) {
-            for (i=0; i < (int) s->img_x; ++i) {
-               int a;
-               out[z+2] = get8u(s);
-               out[z+1] = get8u(s);
-               out[z+0] = get8u(s);
-               z += 3;
-               a = (easy == 2 ? get8(s) : 255);
-               if (target == 4) out[z++] = (uint8) a;
-            }
-         } else {
-            for (i=0; i < (int) s->img_x; ++i) {
-               uint32 v = (bpp == 16 ? get16le(s) : get32le(s));
-               int a;
-               out[z++] = (uint8) shiftsigned(v & mr, rshift, rcount);
-               out[z++] = (uint8) shiftsigned(v & mg, gshift, gcount);
-               out[z++] = (uint8) shiftsigned(v & mb, bshift, bcount);
-               a = (ma ? shiftsigned(v & ma, ashift, acount) : 255);
-               if (target == 4) out[z++] = (uint8) a; 
-            }
-         }
-         skip(s, pad);
-      }
-   }
-   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 = convert_format(out, target, req_comp, s->img_x, s->img_y);
-      if (out == NULL) return out; // convert_format frees input on failure
-   }
-
-   *x = s->img_x;
-   *y = s->img_y;
-   if (comp) *comp = s->img_n;
-   return out;
-}
-
-static stbi_uc *stbi_bmp_load(stbi *s,int *x, int *y, int *comp, int req_comp)
-{
-   return bmp_load(s, x,y,comp,req_comp);
-}
-
-
-// Targa Truevision - TGA
-// by Jonathan Dummer
-
-static int tga_info(stbi *s, int *x, int *y, int *comp)
-{
-    int tga_w, tga_h, tga_comp;
-    int sz;
-    get8u(s);                   // discard Offset
-    sz = get8u(s);              // color type
-    if( sz > 1 ) {
-        stbi_rewind(s);
-        return 0;      // only RGB or indexed allowed
-    }
-    sz = get8u(s);              // image type
-    // only RGB or grey allowed, +/- RLE
-    if ((sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11)) return 0;
-    skip(s,9);
-    tga_w = get16le(s);
-    if( tga_w < 1 ) {
-        stbi_rewind(s);
-        return 0;   // test width
-    }
-    tga_h = get16le(s);
-    if( tga_h < 1 ) {
-        stbi_rewind(s);
-        return 0;   // test height
-    }
-    sz = get8(s);               // bits per pixel
-    // only RGB or RGBA or grey allowed
-    if ((sz != 8) && (sz != 16) && (sz != 24) && (sz != 32)) {
-        stbi_rewind(s);
-        return 0;
-    }
-    tga_comp = sz;
-    if (x) *x = tga_w;
-    if (y) *y = tga_h;
-    if (comp) *comp = tga_comp / 8;
-    return 1;                   // seems to have passed everything
-}
-
-int stbi_tga_info(stbi *s, int *x, int *y, int *comp)
-{
-    return tga_info(s, x, y, comp);
-}
-
-static int tga_test(stbi *s)
-{
-   int sz;
-   get8u(s);      //   discard Offset
-   sz = get8u(s);   //   color type
-   if ( sz > 1 ) return 0;   //   only RGB or indexed allowed
-   sz = get8u(s);   //   image type
-   if ( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0;   //   only RGB or grey allowed, +/- RLE
-   get16(s);      //   discard palette start
-   get16(s);      //   discard palette length
-   get8(s);         //   discard bits per palette color entry
-   get16(s);      //   discard x origin
-   get16(s);      //   discard y origin
-   if ( get16(s) < 1 ) return 0;      //   test width
-   if ( get16(s) < 1 ) return 0;      //   test height
-   sz = get8(s);   //   bits per pixel
-   if ( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0;   //   only RGB or RGBA or grey allowed
-   return 1;      //   seems to have passed everything
-}
-
-static int stbi_tga_test(stbi *s)
-{
-   int res = tga_test(s);
-   stbi_rewind(s);
-   return res;
-}
-
-static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   //   read in the TGA header stuff
-   int tga_offset = get8u(s);
-   int tga_indexed = get8u(s);
-   int tga_image_type = get8u(s);
-   int tga_is_RLE = 0;
-   int tga_palette_start = get16le(s);
-   int tga_palette_len = get16le(s);
-   int tga_palette_bits = get8u(s);
-   int tga_x_origin = get16le(s);
-   int tga_y_origin = get16le(s);
-   int tga_width = get16le(s);
-   int tga_height = get16le(s);
-   int tga_bits_per_pixel = get8u(s);
-   int tga_inverted = get8u(s);
-   //   image data
-   unsigned char *tga_data;
-   unsigned char *tga_palette = NULL;
-   int i, j;
-   unsigned char raw_data[4];
-   unsigned char trans_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;
-   }
-   /* int tga_alpha_bits = tga_inverted & 15; */
-   tga_inverted = 1 - ((tga_inverted >> 5) & 1);
-
-   //   error check
-   if ( //(tga_indexed) ||
-      (tga_width < 1) || (tga_height < 1) ||
-      (tga_image_type < 1) || (tga_image_type > 3) ||
-      ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
-      (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32))
-      )
-   {
-      return NULL; // we don't report this as a bad TGA because we don't even know if it's TGA
-   }
-
-   //   If I'm paletted, then I'll use the number of bits from the palette
-   if ( tga_indexed )
-   {
-      tga_bits_per_pixel = tga_palette_bits;
-   }
-
-   //   tga info
-   *x = tga_width;
-   *y = tga_height;
-   if ( (req_comp < 1) || (req_comp > 4) )
-   {
-      //   just use whatever the file was
-      req_comp = tga_bits_per_pixel / 8;
-      *comp = req_comp;
-   } else
-   {
-      //   force a new number of components
-      *comp = tga_bits_per_pixel/8;
-   }
-   tga_data = (unsigned char*)malloc( tga_width * tga_height * req_comp );
-   if (!tga_data) return epuc("outofmem", "Out of memory");
-
-   //   skip to the data's starting position (offset usually = 0)
-   skip(s, tga_offset );
-   //   do I need to load a palette?
-   if ( tga_indexed )
-   {
-      //   any data to skip? (offset usually = 0)
-      skip(s, tga_palette_start );
-      //   load the palette
-      tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 );
-      if (!tga_palette) return epuc("outofmem", "Out of memory");
-      if (!getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) {
-         free(tga_data);
-         free(tga_palette);
-         return epuc("bad palette", "Corrupt TGA");
-      }
-   }
-   //   load the data
-   trans_data[0] = trans_data[1] = trans_data[2] = trans_data[3] = 0;
-   for (i=0; i < tga_width * tga_height; ++i)
-   {
-      //   if I'm in RLE mode, do I need to get a RLE chunk?
-      if ( tga_is_RLE )
-      {
-         if ( RLE_count == 0 )
-         {
-            //   yep, get the next byte as a RLE command
-            int RLE_cmd = get8u(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 1 byte, then perform the lookup
-            int pal_idx = get8u(s);
-            if ( pal_idx >= tga_palette_len )
-            {
-               //   invalid index
-               pal_idx = 0;
-            }
-            pal_idx *= tga_bits_per_pixel / 8;
-            for (j = 0; j*8 < tga_bits_per_pixel; ++j)
-            {
-               raw_data[j] = tga_palette[pal_idx+j];
-            }
-         } else
-         {
-            //   read in the data raw
-            for (j = 0; j*8 < tga_bits_per_pixel; ++j)
-            {
-               raw_data[j] = get8u(s);
-            }
-         }
-         //   convert raw to the intermediate format
-         switch (tga_bits_per_pixel)
-         {
-         case 8:
-            //   Luminous => RGBA
-            trans_data[0] = raw_data[0];
-            trans_data[1] = raw_data[0];
-            trans_data[2] = raw_data[0];
-            trans_data[3] = 255;
-            break;
-         case 16:
-            //   Luminous,Alpha => RGBA
-            trans_data[0] = raw_data[0];
-            trans_data[1] = raw_data[0];
-            trans_data[2] = raw_data[0];
-            trans_data[3] = raw_data[1];
-            break;
-         case 24:
-            //   BGR => RGBA
-            trans_data[0] = raw_data[2];
-            trans_data[1] = raw_data[1];
-            trans_data[2] = raw_data[0];
-            trans_data[3] = 255;
-            break;
-         case 32:
-            //   BGRA => RGBA
-            trans_data[0] = raw_data[2];
-            trans_data[1] = raw_data[1];
-            trans_data[2] = raw_data[0];
-            trans_data[3] = raw_data[3];
-            break;
-         }
-         //   clear the reading flag for the next pixel
-         read_next_pixel = 0;
-      } // end of reading a pixel
-      //   convert to final format
-      switch (req_comp)
-      {
-      case 1:
-         //   RGBA => Luminance
-         tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]);
-         break;
-      case 2:
-         //   RGBA => Luminance,Alpha
-         tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]);
-         tga_data[i*req_comp+1] = trans_data[3];
-         break;
-      case 3:
-         //   RGBA => RGB
-         tga_data[i*req_comp+0] = trans_data[0];
-         tga_data[i*req_comp+1] = trans_data[1];
-         tga_data[i*req_comp+2] = trans_data[2];
-         break;
-      case 4:
-         //   RGBA => RGBA
-         tga_data[i*req_comp+0] = trans_data[0];
-         tga_data[i*req_comp+1] = trans_data[1];
-         tga_data[i*req_comp+2] = trans_data[2];
-         tga_data[i*req_comp+3] = trans_data[3];
-         break;
-      }
-      //   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 * req_comp;
-         int index2 = (tga_height - 1 - j) * tga_width * req_comp;
-         for (i = tga_width * req_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 )
-   {
-      free( tga_palette );
-   }
-   //   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;
-}
-
-static stbi_uc *stbi_tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   return tga_load(s,x,y,comp,req_comp);
-}
-
-
-// *************************************************************************************************
-// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
-
-static int psd_test(stbi *s)
-{
-   if (get32(s) != 0x38425053) return 0;   // "8BPS"
-   else return 1;
-}
-
-static int stbi_psd_test(stbi *s)
-{
-   int r = psd_test(s);
-   stbi_rewind(s);
-   return r;
-}
-
-static stbi_uc *psd_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   int   pixelCount;
-   int channelCount, compression;
-   int channel, i, count, len;
-   int w,h;
-   uint8 *out;
-
-   // Check identifier
-   if (get32(s) != 0x38425053)   // "8BPS"
-      return epuc("not PSD", "Corrupt PSD image");
-
-   // Check file type version.
-   if (get16(s) != 1)
-      return epuc("wrong version", "Unsupported version of PSD image");
-
-   // Skip 6 reserved bytes.
-   skip(s, 6 );
-
-   // Read the number of channels (R, G, B, A, etc).
-   channelCount = get16(s);
-   if (channelCount < 0 || channelCount > 16)
-      return epuc("wrong channel count", "Unsupported number of channels in PSD image");
-
-   // Read the rows and columns of the image.
-   h = get32(s);
-   w = get32(s);
-   
-   // Make sure the depth is 8 bits.
-   if (get16(s) != 8)
-      return epuc("unsupported bit depth", "PSD bit depth is not 8 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 (get16(s) != 3)
-      return epuc("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.)
-   skip(s,get32(s) );
-
-   // Skip the image resources.  (resolution, pen tool paths, etc)
-   skip(s, get32(s) );
-
-   // Skip the reserved data.
-   skip(s, get32(s) );
-
-   // Find out if the data is compressed.
-   // Known values:
-   //   0: no compression
-   //   1: RLE compressed
-   compression = get16(s);
-   if (compression > 1)
-      return epuc("bad compression", "PSD has an unknown compression format");
-
-   // Create the destination image.
-   out = (stbi_uc *) malloc(4 * w*h);
-   if (!out) return epuc("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.
-      skip(s, h * channelCount * 2 );
-
-      // Read the RLE data by channel.
-      for (channel = 0; channel < 4; channel++) {
-         uint8 *p;
-         
-         p = out+channel;
-         if (channel >= channelCount) {
-            // Fill this channel with default data.
-            for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4;
-         } else {
-            // Read the RLE data.
-            count = 0;
-            while (count < pixelCount) {
-               len = get8(s);
-               if (len == 128) {
-                  // No-op.
-               } else if (len < 128) {
-                  // Copy next len+1 bytes literally.
-                  len++;
-                  count += len;
-                  while (len) {
-                     *p = get8u(s);
-                     p += 4;
-                     len--;
-                  }
-               } else if (len > 128) {
-                  uint8   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 = get8u(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++) {
-         uint8 *p;
-         
-         p = out + channel;
-         if (channel > channelCount) {
-            // Fill this channel with default data.
-            for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4;
-         } else {
-            // Read the data.
-            for (i = 0; i < pixelCount; i++)
-               *p = get8u(s), p += 4;
-         }
-      }
-   }
-
-   if (req_comp && req_comp != 4) {
-      out = convert_format(out, 4, req_comp, w, h);
-      if (out == NULL) return out; // convert_format frees input on failure
-   }
-
-   if (comp) *comp = channelCount;
-   *y = h;
-   *x = w;
-   
-   return out;
-}
-
-static stbi_uc *stbi_psd_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   return psd_load(s,x,y,comp,req_comp);
-}
-
-// *************************************************************************************************
-// 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/
-
-static int pic_is4(stbi *s,const char *str)
-{
-   int i;
-   for (i=0; i<4; ++i)
-      if (get8(s) != (stbi_uc)str[i])
-         return 0;
-
-   return 1;
-}
-
-static int pic_test(stbi *s)
-{
-   int i;
-
-   if (!pic_is4(s,"\x53\x80\xF6\x34"))
-      return 0;
-
-   for(i=0;i<84;++i)
-      get8(s);
-
-   if (!pic_is4(s,"PICT"))
-      return 0;
-
-   return 1;
-}
-
-typedef struct
-{
-   stbi_uc size,type,channel;
-} pic_packet_t;
-
-static stbi_uc *pic_readval(stbi *s, int channel, stbi_uc *dest)
-{
-   int mask=0x80, i;
-
-   for (i=0; i<4; ++i, mask>>=1) {
-      if (channel & mask) {
-         if (at_eof(s)) return epuc("bad file","PIC file too short");
-         dest[i]=get8u(s);
-      }
-   }
-
-   return dest;
-}
-
-static void pic_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 *pic_load2(stbi *s,int width,int height,int *comp, stbi_uc *result)
-{
-   int act_comp=0,num_packets=0,y,chained;
-   pic_packet_t packets[10];
-
-   // this will (should...) cater for even some bizarre stuff like having data
-    // for the same channel in multiple packets.
-   do {
-      pic_packet_t *packet;
-
-      if (num_packets==sizeof(packets)/sizeof(packets[0]))
-         return epuc("bad format","too many packets");
-
-      packet = &packets[num_packets++];
-
-      chained = get8(s);
-      packet->size    = get8u(s);
-      packet->type    = get8u(s);
-      packet->channel = get8u(s);
-
-      act_comp |= packet->channel;
-
-      if (at_eof(s))          return epuc("bad file","file too short (reading packets)");
-      if (packet->size != 8)  return epuc("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) {
-         pic_packet_t *packet = &packets[packet_idx];
-         stbi_uc *dest = result+y*width*4;
-
-         switch (packet->type) {
-            default:
-               return epuc("bad format","packet has bad compression type");
-
-            case 0: {//uncompressed
-               int x;
-
-               for(x=0;x<width;++x, dest+=4)
-                  if (!pic_readval(s,packet->channel,dest))
-                     return 0;
-               break;
-            }
-
-            case 1://Pure RLE
-               {
-                  int left=width, i;
-
-                  while (left>0) {
-                     stbi_uc count,value[4] = { 0 };
-
-                     count=get8u(s);
-                     if (at_eof(s))   return epuc("bad file","file too short (pure read count)");
-
-                     if (count > left)
-                        count = (uint8) left;
-
-                     if (!pic_readval(s,packet->channel,value))  return 0;
-
-                     for(i=0; i<count; ++i,dest+=4)
-                        pic_copyval(packet->channel,dest,value);
-                     left -= count;
-                  }
-               }
-               break;
-
-            case 2: {//Mixed RLE
-               int left=width;
-               while (left>0) {
-                  int count = get8(s), i;
-                  if (at_eof(s))  return epuc("bad file","file too short (mixed read count)");
-
-                  if (count >= 128) { // Repeated
-                     stbi_uc value[4] = { 0 };
-                     int i;
-
-                     if (count==128)
-                        count = get16(s);
-                     else
-                        count -= 127;
-                     if (count > left)
-                        return epuc("bad file","scanline overrun");
-
-                     if (!pic_readval(s,packet->channel,value))
-                        return 0;
-
-                     for(i=0;i<count;++i, dest += 4)
-                        pic_copyval(packet->channel,dest,value);
-                  } else { // Raw
-                     ++count;
-                     if (count>left) return epuc("bad file","scanline overrun");
-
-                     for(i=0;i<count;++i, dest+=4)
-                        if (!pic_readval(s,packet->channel,dest))
-                           return 0;
-                  }
-                  left-=count;
-               }
-               break;
-            }
-         }
-      }
-   }
-
-   return result;
-}
-
-static stbi_uc *pic_load(stbi *s,int *px,int *py,int *comp,int req_comp)
-{
-   stbi_uc *result;
-   int i, x,y;
-
-   for (i=0; i<92; ++i)
-      get8(s);
-
-   x = get16(s);
-   y = get16(s);
-   if (at_eof(s))  return epuc("bad file","file too short (pic header)");
-   if ((1 << 28) / x < y) return epuc("too large", "Image too large to decode");
-
-   get32(s); //skip `ratio'
-   get16(s); //skip `fields'
-   get16(s); //skip `pad'
-
-   // intermediate buffer is RGBA
-   result = (stbi_uc *) malloc(x*y*4);
-   memset(result, 0xff, x*y*4);
-
-   if (!pic_load2(s,x,y,comp, result)) {
-      free(result);
-      result=0;
-   }
-   *px = x;
-   *py = y;
-   if (req_comp == 0) req_comp = *comp;
-   result=convert_format(result,4,req_comp,x,y);
-
-   return result;
-}
-
-static int stbi_pic_test(stbi *s)
-{
-   int r = pic_test(s);
-   stbi_rewind(s);
-   return r;
-}
-
-static stbi_uc *stbi_pic_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   return pic_load(s,x,y,comp,req_comp);
-}
-
-// *************************************************************************************************
-// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
-typedef struct stbi_gif_lzw_struct {
-   int16 prefix;
-   uint8 first;
-   uint8 suffix;
-} stbi_gif_lzw;
-
-typedef struct stbi_gif_struct
-{
-   int w,h;
-   stbi_uc *out;                 // output buffer (always 4 components)
-   int flags, bgindex, ratio, transparent, eflags;
-   uint8  pal[256][4];
-   uint8 lpal[256][4];
-   stbi_gif_lzw codes[4096];
-   uint8 *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 gif_test(stbi *s)
-{
-   int sz;
-   if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8') return 0;
-   sz = get8(s);
-   if (sz != '9' && sz != '7') return 0;
-   if (get8(s) != 'a') return 0;
-   return 1;
-}
-
-static int stbi_gif_test(stbi *s)
-{
-   int r = gif_test(s);
-   stbi_rewind(s);
-   return r;
-}
-
-static void stbi_gif_parse_colortable(stbi *s, uint8 pal[256][4], int num_entries, int transp)
-{
-   int i;
-   for (i=0; i < num_entries; ++i) {
-      pal[i][2] = get8u(s);
-      pal[i][1] = get8u(s);
-      pal[i][0] = get8u(s);
-      pal[i][3] = transp ? 0 : 255;
-   }   
-}
-
-static int stbi_gif_header(stbi *s, stbi_gif *g, int *comp, int is_info)
-{
-   uint8 version;
-   if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8')
-      return e("not GIF", "Corrupt GIF");
-
-   version = get8u(s);
-   if (version != '7' && version != '9')    return e("not GIF", "Corrupt GIF");
-   if (get8(s) != 'a')                      return e("not GIF", "Corrupt GIF");
- 
-   failure_reason = "";
-   g->w = get16le(s);
-   g->h = get16le(s);
-   g->flags = get8(s);
-   g->bgindex = get8(s);
-   g->ratio = 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 *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, uint16 code)
-{
-   uint8 *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 uint8 *stbi_process_gif_raster(stbi *s, stbi_gif *g)
-{
-   uint8 lzw_cs;
-   int32 len, code;
-   uint32 first;
-   int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
-   stbi_gif_lzw *p;
-
-   lzw_cs = get8u(s);
-   clear = 1 << lzw_cs;
-   first = 1;
-   codesize = lzw_cs + 1;
-   codemask = (1 << codesize) - 1;
-   bits = 0;
-   valid_bits = 0;
-   for (code = 0; code < clear; code++) {
-      g->codes[code].prefix = -1;
-      g->codes[code].first = (uint8) code;
-      g->codes[code].suffix = (uint8) code;
-   }
-
-   // support no starting clear code
-   avail = clear+2;
-   oldcode = -1;
-
-   len = 0;
-   for(;;) {
-      if (valid_bits < codesize) {
-         if (len == 0) {
-            len = get8(s); // start new block
-            if (len == 0) 
-               return g->out;
-         }
-         --len;
-         bits |= (int32) get8(s) << valid_bits;
-         valid_bits += 8;
-      } else {
-         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
-            skip(s, len);
-            while ((len = get8(s)) > 0)
-               skip(s,len);
-            return g->out;
-         } else if (code <= avail) {
-            if (first) return epuc("no clear code", "Corrupt GIF");
-
-            if (oldcode >= 0) {
-               p = &g->codes[avail++];
-               if (avail > 4096)        return epuc("too many codes", "Corrupt GIF");
-               p->prefix = (int16) oldcode;
-               p->first = g->codes[oldcode].first;
-               p->suffix = (code == avail) ? p->first : g->codes[code].first;
-            } else if (code == avail)
-               return epuc("illegal code in raster", "Corrupt GIF");
-
-            stbi_out_gif_code(g, (uint16) code);
-
-            if ((avail & codemask) == 0 && avail <= 0x0FFF) {
-               codesize++;
-               codemask = (1 << codesize) - 1;
-            }
-
-            oldcode = code;
-         } else {
-            return epuc("illegal code in raster", "Corrupt GIF");
-         }
-      } 
-   }
-}
-
-static void stbi_fill_gif_background(stbi_gif *g)
-{
-   int i;
-   uint8 *c = g->pal[g->bgindex];
-   // @OPTIMIZE: write a dword at a time
-   for (i = 0; i < g->w * g->h * 4; i += 4) {
-      uint8 *p  = &g->out[i];
-      p[0] = c[2];
-      p[1] = c[1];
-      p[2] = c[0];
-      p[3] = c[3];
-   }
-}
-
-// this function is designed to support animated gifs, although stb_image doesn't support it
-static uint8 *stbi_gif_load_next(stbi *s, stbi_gif *g, int *comp, int req_comp)
-{
-   int i;
-   uint8 *old_out = 0;
-
-   if (g->out == 0) {
-      if (!stbi_gif_header(s, g, comp,0))     return 0; // failure_reason set by stbi_gif_header
-      g->out = (uint8 *) malloc(4 * g->w * g->h);
-      if (g->out == 0)                      return epuc("outofmem", "Out of memory");
-      stbi_fill_gif_background(g);
-   } else {
-      // animated-gif-only path
-      if (((g->eflags & 0x1C) >> 2) == 3) {
-         old_out = g->out;
-         g->out = (uint8 *) malloc(4 * g->w * g->h);
-         if (g->out == 0)                   return epuc("outofmem", "Out of memory");
-         memcpy(g->out, old_out, g->w*g->h*4);
-      }
-   }
-    
-   for (;;) {
-      switch (get8(s)) {
-         case 0x2C: /* Image Descriptor */
-         {
-            int32 x, y, w, h;
-            uint8 *o;
-
-            x = get16le(s);
-            y = get16le(s);
-            w = get16le(s);
-            h = get16le(s);
-            if (((x + w) > (g->w)) || ((y + h) > (g->h)))
-               return epuc("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 = 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 = (uint8 *) g->lpal;       
-            } else if (g->flags & 0x80) {
-               for (i=0; i < 256; ++i)  // @OPTIMIZE: reset only the previous transparent
-                  g->pal[i][3] = 255; 
-               if (g->transparent >= 0 && (g->eflags & 0x01))
-                  g->pal[g->transparent][3] = 0;
-               g->color_table = (uint8 *) g->pal;
-            } else
-               return epuc("missing color table", "Corrupt GIF");
-   
-            o = stbi_process_gif_raster(s, g);
-            if (o == NULL) return NULL;
-
-            if (req_comp && req_comp != 4)
-               o = convert_format(o, 4, req_comp, g->w, g->h);
-            return o;
-         }
-
-         case 0x21: // Comment Extension.
-         {
-            int len;
-            if (get8(s) == 0xF9) { // Graphic Control Extension.
-               len = get8(s);
-               if (len == 4) {
-                  g->eflags = get8(s);
-                  get16le(s); // delay
-                  g->transparent = get8(s);
-               } else {
-                  skip(s, len);
-                  break;
-               }
-            }
-            while ((len = get8(s)) != 0)
-               skip(s, len);
-            break;
-         }
-
-         case 0x3B: // gif stream termination code
-            return (uint8 *) 1;
-
-         default:
-            return epuc("unknown code", "Corrupt GIF");
-      }
-   }
-}
-
-static stbi_uc *stbi_gif_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   uint8 *u = 0;
-   stbi_gif g;
-   memset(&g, 0, sizeof(g) );
-
-   u = stbi_gif_load_next(s, &g, comp, req_comp);
-   if (u == (void *) 1) u = 0;  // end of animated gif marker
-   if (u) {
-      *x = g.w;
-      *y = g.h;
-   }
-
-   return u;
-}
-
-static int stbi_gif_info(stbi *s, int *x, int *y, int *comp)
-{
-   return stbi_gif_info_raw(s,x,y,comp);
-}
-
-
-// *************************************************************************************************
-// Radiance RGBE HDR loader
-// originally by Nicolas Schulz
-#ifndef STBI_NO_HDR
-static int hdr_test(stbi *s)
-{
-   const char *signature = "#?RADIANCE\n";
-   int i;
-   for (i=0; signature[i]; ++i)
-      if (get8(s) != signature[i])
-         return 0;
-   return 1;
-}
-
-static int stbi_hdr_test(stbi* s)
-{
-   int r = hdr_test(s);
-   stbi_rewind(s);
-   return r;
-}
-
-#define HDR_BUFLEN  1024
-static char *hdr_gettoken(stbi *z, char *buffer)
-{
-   int len=0;
-   char c = '\0';
-
-   c = (char) get8(z);
-
-   while (!at_eof(z) && c != '\n') {
-      buffer[len++] = c;
-      if (len == HDR_BUFLEN-1) {
-         // flush to end of line
-         while (!at_eof(z) && get8(z) != '\n')
-            ;
-         break;
-      }
-      c = (char) get8(z);
-   }
-
-   buffer[len] = 0;
-   return buffer;
-}
-
-static void 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 *hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   char buffer[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(hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
-      return epf("not HDR", "Corrupt HDR image");
-   
-   // Parse header
-   for(;;) {
-      token = hdr_gettoken(s,buffer);
-      if (token[0] == 0) break;
-      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
-   }
-
-   if (!valid)    return epf("unsupported format", "Unsupported HDR format");
-
-   // Parse width and height
-   // can't use sscanf() if we're not using stdio!
-   token = hdr_gettoken(s,buffer);
-   if (strncmp(token, "-Y ", 3))  return epf("unsupported data layout", "Unsupported HDR format");
-   token += 3;
-   height = strtol(token, &token, 10);
-   while (*token == ' ') ++token;
-   if (strncmp(token, "+X ", 3))  return epf("unsupported data layout", "Unsupported HDR format");
-   token += 3;
-   width = strtol(token, NULL, 10);
-
-   *x = width;
-   *y = height;
-
-   *comp = 3;
-   if (req_comp == 0) req_comp = 3;
-
-   // Read data
-   hdr_data = (float *) 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:
-            getn(s, rgbe, 4);
-            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 = get8(s);
-         c2 = get8(s);
-         len = 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)
-            uint8 rgbe[4];
-            rgbe[0] = (uint8) c1;
-            rgbe[1] = (uint8) c2;
-            rgbe[2] = (uint8) len;
-            rgbe[3] = (uint8) get8u(s);
-            hdr_convert(hdr_data, rgbe, req_comp);
-            i = 1;
-            j = 0;
-            free(scanline);
-            goto main_decode_loop; // yes, this makes no sense
-         }
-         len <<= 8;
-         len |= get8(s);
-         if (len != width) { free(hdr_data); free(scanline); return epf("invalid decoded scanline length", "corrupt HDR"); }
-         if (scanline == NULL) scanline = (stbi_uc *) malloc(width * 4);
-            
-         for (k = 0; k < 4; ++k) {
-            i = 0;
-            while (i < width) {
-               count = get8u(s);
-               if (count > 128) {
-                  // Run
-                  value = get8u(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] = get8u(s);
-               }
-            }
-         }
-         for (i=0; i < width; ++i)
-            hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
-      }
-      free(scanline);
-   }
-
-   return hdr_data;
-}
-
-static float *stbi_hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
-   return hdr_load(s,x,y,comp,req_comp);
-}
-
-static int stbi_hdr_info(stbi *s, int *x, int *y, int *comp)
-{
-   char buffer[HDR_BUFLEN];
-   char *token;
-   int valid = 0;
-
-   if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0) {
-       stbi_rewind( s );
-       return 0;
-   }
-
-   for(;;) {
-      token = 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 = hdr_gettoken(s,buffer);
-   if (strncmp(token, "-Y ", 3)) {
-       stbi_rewind( s );
-       return 0;
-   }
-   token += 3;
-   *y = strtol(token, &token, 10);
-   while (*token == ' ') ++token;
-   if (strncmp(token, "+X ", 3)) {
-       stbi_rewind( s );
-       return 0;
-   }
-   token += 3;
-   *x = strtol(token, NULL, 10);
-   *comp = 3;
-   return 1;
-}
-#endif // STBI_NO_HDR
-
-static int stbi_bmp_info(stbi *s, int *x, int *y, int *comp)
-{
-   int hsz;
-   if (get8(s) != 'B' || get8(s) != 'M') {
-       stbi_rewind( s );
-       return 0;
-   }
-   skip(s,12);
-   hsz = get32le(s);
-   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) {
-       stbi_rewind( s );
-       return 0;
-   }
-   if (hsz == 12) {
-      *x = get16le(s);
-      *y = get16le(s);
-   } else {
-      *x = get32le(s);
-      *y = get32le(s);
-   }
-   if (get16le(s) != 1) {
-       stbi_rewind( s );
-       return 0;
-   }
-   *comp = get16le(s) / 8;
-   return 1;
-}
-
-static int stbi_psd_info(stbi *s, int *x, int *y, int *comp)
-{
-   int channelCount;
-   if (get32(s) != 0x38425053) {
-       stbi_rewind( s );
-       return 0;
-   }
-   if (get16(s) != 1) {
-       stbi_rewind( s );
-       return 0;
-   }
-   skip(s, 6);
-   channelCount = get16(s);
-   if (channelCount < 0 || channelCount > 16) {
-       stbi_rewind( s );
-       return 0;
-   }
-   *y = get32(s);
-   *x = get32(s);
-   if (get16(s) != 8) {
-       stbi_rewind( s );
-       return 0;
-   }
-   if (get16(s) != 3) {
-       stbi_rewind( s );
-       return 0;
-   }
-   *comp = 4;
-   return 1;
-}
-
-static int stbi_pic_info(stbi *s, int *x, int *y, int *comp)
-{
-   int act_comp=0,num_packets=0,chained;
-   pic_packet_t packets[10];
-
-   skip(s, 92);
-
-   *x = get16(s);
-   *y = get16(s);
-   if (at_eof(s))  return 0;
-   if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
-       stbi_rewind( s );
-       return 0;
-   }
-
-   skip(s, 8);
-
-   do {
-      pic_packet_t *packet;
-
-      if (num_packets==sizeof(packets)/sizeof(packets[0]))
-         return 0;
-
-      packet = &packets[num_packets++];
-      chained = get8(s);
-      packet->size    = get8u(s);
-      packet->type    = get8u(s);
-      packet->channel = get8u(s);
-      act_comp |= packet->channel;
-
-      if (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;
-}
-
-static int stbi_info_main(stbi *s, int *x, int *y, int *comp)
-{
-   if (stbi_jpeg_info(s, x, y, comp))
-       return 1;
-   if (stbi_png_info(s, x, y, comp))
-       return 1;
-   if (stbi_gif_info(s, x, y, comp))
-       return 1;
-   if (stbi_bmp_info(s, x, y, comp))
-       return 1;
-   if (stbi_psd_info(s, x, y, comp))
-       return 1;
-   if (stbi_pic_info(s, x, y, comp))
-       return 1;
-   #ifndef STBI_NO_HDR
-   if (stbi_hdr_info(s, x, y, comp))
-       return 1;
-   #endif
-   // test tga last because it's a crappy test!
-   if (stbi_tga_info(s, x, y, comp))
-       return 1;
-   return e("unknown image type", "Image not of any known type, or corrupt");
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_info(char const *filename, int *x, int *y, int *comp)
-{
-    FILE *f = fopen(filename, "rb");
-    int result;
-    if (!f) return e("can't fopen", "Unable to open file");
-    result = stbi_info_from_file(f, x, y, comp);
-    fclose(f);
-    return result;
-}
-
-int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
-{
-   int r;
-   stbi s;
-   long pos = ftell(f);
-   start_file(&s, f);
-   r = stbi_info_main(&s,x,y,comp);
-   fseek(f,pos,SEEK_SET);
-   return r;
-}
-#endif // !STBI_NO_STDIO
-
-int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
-{
-   stbi s;
-   start_mem(&s,buffer,len);
-   return stbi_info_main(&s,x,y,comp);
-}
-
-int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
-{
-   stbi s;
-   start_callbacks(&s, (stbi_io_callbacks *) c, user);
-   return stbi_info_main(&s,x,y,comp);
-}
-
-#endif // STBI_HEADER_FILE_ONLY
-
-/*
-   revision history:
-      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-uint8 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.e. Janez (U+017D)emva)
-      1.21   fix use of 'uint8' 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 - 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   first released version
-*/
+/* stb_image - v1.39 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c
+   when you control the images you're loading
+                                     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.
+
+   QUICK NOTES:
+      Primarily of interest to game developers and other people who can
+          avoid problematic images and only need the trivial interface
+
+      JPEG baseline (no JPEG progressive)
+      PNG 8-bit-per-channel only
+
+      TGA (not sure what subset, if a subset)
+      BMP non-1bpp, non-RLE
+      PSD (composited view only, no extra channels)
+
+      GIF (*comp always reports as 4-channel)
+      HDR (radiance rgbE format)
+      PIC (Softimage PIC)
+
+      - stbi__jpeg_huff_decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+      - stbi__jpeg_huff_decode from arbitrary I/O callbacks
+      - overridable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD)
+
+   Latest revisions:
+      1.39 (2014-06-15) TGA optimization fix, multiple BMP fixes
+      1.38 (2014-06-06) suppress MSVC run-time warnings, fix accidental rename of 'skip'
+      1.37 (2014-06-04) remove duplicate typedef
+      1.36 (2014-06-03) converted to header file, allow reading incorrect iphoned-images without iphone flag
+      1.35 (2014-05-27) warnings, bugfixes, TGA optimization, etc
+      1.34 (unknown   ) warning fix
+      1.33 (2011-07-14) minor fixes suggested by Dave Moore
+
+   See end of file for full revision history.
+
+   TODO:
+      stbi_info support for BMP,PSD,HDR,PIC
+
+
+ ============================    Contributors    =========================
+              
+ Image formats                                Bug fixes & warning fixes
+    Sean Barrett (jpeg, png, bmp)                Marc LeBlanc
+    Nicolas Schulz (hdr, psd)                    Christpher Lloyd
+    Jonathan Dummer (tga)                        Dave Moore
+    Jean-Marc Lienher (gif)                      Won Chun
+    Tom Seddon (pic)                             the Horde3D community
+    Thatcher Ulrich (psd)                        Janez Zemva
+                                                 Jonathan Blow
+                                                 Laurent Gomila
+ Extensions, features                            Aruelien Pocheville
+    Jetro Lauha (stbi_info)                      Ryamond Barbiero
+    James "moose2000" Brown (iPhone PNG)         David Woo
+    Ben "Disch" Wenger (io callbacks)            Roy Eltham
+    Martin "SpartanJ" Golini                     Luke Graham
+                                                 Thomas Ruf
+                                                 John Bartholomew
+ Optimizations & bugfixes                        Ken Hamada
+    Fabian "ryg" Giesen                          Cort Stratton
+    Arseny Kapoulkine                            Blazej Dariusz Roszkowski
+                                                 Thibault Reuille
+ If your name should be here but                 Paul Du Bois
+ isn't, let Sean know.                           Guillaume George
+                                                 Jerry Jansson
+                                                 Hayaki Saito
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// Limitations:
+//    - no jpeg progressive support
+//    - non-HDR formats support 8-bit samples only (jpeg, png)
+//    - no delayed line count (jpeg) -- IJG doesn't support either
+//    - no 1-bit BMP
+//    - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below):
+//    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. 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 easily see if it's opaque.
+//
+// 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.
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB; nominally they
+// would silently load as BGR, except the existing code should have just
+// failed on such iPhone PNGs. But 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.
+//
+// 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).
+//
+// ===========================================================================
+//
+// 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);
+//
+// ===========================================================================
+//
+// 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).
+
+
+#ifndef STBI_NO_STDIO
+
+#if defined(_MSC_VER) && _MSC_VER >= 1400 && !defined(_CRT_SECURE_NO_WARNINGS)
+#define _CRT_SECURE_NO_WARNINGS // suppress warnings about fopen()
+#pragma warning(push)
+#pragma warning(disable:4996)   // suppress even more warnings about fopen()
+#endif
+#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
+//
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load            (char const *filename,     int *x, int *y, int *comp, int req_comp);
+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
+
+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_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+
+#ifndef STBI_NO_HDR
+   STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+
+   #ifndef STBI_NO_STDIO
+   STBIDEF float *stbi_loadf            (char const *filename,   int *x, int *y, int *comp, int req_comp);
+   STBIDEF float *stbi_loadf_from_file  (FILE *f,                int *x, int *y, int *comp, int req_comp);
+   #endif
+   
+   STBIDEF float *stbi_loadf_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+
+   STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma);
+   STBIDEF void   stbi_hdr_to_ldr_scale(float scale);
+
+   STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma);
+   STBIDEF void   stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_HDR
+
+// stbi_is_hdr is always defined
+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);
+
+
+// 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);
+
+
+// define faster low-level operations (typically SIMD support)
+#ifdef STBI_SIMD
+typedef void (*stbi_idct_8x8)(stbi_uc *out, int out_stride, short data[64], unsigned short *dequantize);
+// compute an integer IDCT on "input"
+//     input[x] = data[x] * dequantize[x]
+//     write results to 'out': 64 samples, each run of 8 spaced by 'out_stride'
+//                             CLAMP results to 0..255
+typedef void (*stbi_YCbCr_to_RGB_run)(stbi_uc *output, stbi_uc const  *y, stbi_uc const *cb, stbi_uc const *cr, int count, int step);
+// compute a conversion from YCbCr to RGB
+//     'count' pixels
+//     write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
+//     y: Y input channel
+//     cb: Cb input channel; scale/biased to be 0..255
+//     cr: Cr input channel; scale/biased to be 0..255
+
+STBIDEF void stbi_install_idct(stbi_idct_8x8 func);
+STBIDEF void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
+#endif // STBI_SIMD
+
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+////   end header file   /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#ifndef STBI_NO_HDR
+#include <math.h>  // ldexp
+#include <string.h> // strcmp, strtok
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+#include <stdlib.h>
+#include <memory.h>
+#include <assert.h>
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+
+#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
+
+///////////////////////////////////////////////
+//
+//  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;
+} stbi__context;
+
+
+static void stbi__refill_buffer(stbi__context *s);
+
+// initialize a memory-stbi__jpeg_huff_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 = (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);
+}
+
+#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;
+}
+
+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);
+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);
+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__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);
+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);
+#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);
+#endif
+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__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);
+
+
+// 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;
+}
+
+// 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 *) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpuc(x,y)  ((unsigned char *) (stbi__err(x,y)?NULL:NULL))
+
+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
+{
+   free(retval_from_stbi_load);
+}
+
+#ifndef STBI_NO_HDR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp);
+#endif
+
+static unsigned char *stbi_load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp);
+   if (stbi__png_test(s))  return stbi__png_load(s,x,y,comp,req_comp);
+   if (stbi__bmp_test(s))  return stbi__bmp_load(s,x,y,comp,req_comp);
+   if (stbi__gif_test(s))  return stbi__gif_load(s,x,y,comp,req_comp);
+   if (stbi__psd_test(s))  return stbi__psd_load(s,x,y,comp,req_comp);
+   if (stbi__pic_test(s))  return stbi__pic_load(s,x,y,comp,req_comp);
+
+   #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
+
+   // test tga last because it's a crappy test!
+   if (stbi__tga_test(s))
+      return stbi__tga_load(s,x,y,comp,req_comp);
+   return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = 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 unsigned char *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_main(&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 unsigned char *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_main(&s,x,y,comp,req_comp);
+}
+
+unsigned char *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_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_HDR
+
+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))
+      return stbi__hdr_load(s,x,y,comp,req_comp);
+   #endif
+   data = stbi_load_main(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");
+}
+
+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);
+}
+
+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
+float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = fopen(filename, "rb");
+   float *result;
+   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;
+}
+
+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_HDR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_HDR is
+// defined, for API simplicity; if STBI_NO_HDR is defined, it always
+// reports false!
+
+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 = 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
+   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
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_HDR
+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+
+void   stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
+void   stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+
+void   stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+void   stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum
+{
+   SCAN_load=0,
+   SCAN_type,
+   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, stbi__err.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 (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);
+}
+
+static int stbi__get16le(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return z + (stbi__get8(s) << 8);
+}
+
+static stbi__uint32 stbi__get32le(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16le(s);
+   return z + (stbi__get16le(s) << 16);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  generic converter from built-in img_n to req_comp
+//    individual types do this automatically as much as possible (stbi__err.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;
+   assert(req_comp >= 1 && req_comp <= 4);
+
+   good = (unsigned char *) malloc(req_comp * x * y);
+   if (good == NULL) {
+      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: assert(0);
+      }
+      #undef CASE
+   }
+
+   free(data);
+   return good;
+}
+
+#ifndef STBI_NO_HDR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+   int i,k,n;
+   float *output = (float *) malloc(x * y * comp * sizeof(float));
+   if (output == NULL) { 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;
+   }
+   free(data);
+   return output;
+}
+
+#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 *) malloc(x * y * comp);
+   if (output == NULL) { 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);
+      }
+   }
+   free(data);
+   return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  "baseline" JPEG/JFIF decoder (not actually fully baseline implementation)
+//
+//    simple implementation
+//      - channel subsampling of at most 2 in each dimension
+//      - 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
+//      - uses a lot of intermediate memory, could cache poorly
+//      - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4
+//          stb_jpeg:   1.34 seconds (MSVC6, default release build)
+//          stb_jpeg:   1.06 seconds (MSVC6, processor = Pentium Pro)
+//          IJL11.dll:  1.08 seconds (compiled by intel)
+//          IJG 1998:   0.98 seconds (MSVC6, makefile provided by IJG)
+//          IJG 1998:   0.95 seconds (MSVC6, makefile + proc=PPro)
+
+// 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
+{
+   #ifdef STBI_SIMD
+   unsigned short dequant2[4][64];
+   #endif
+   stbi__context *s;
+   stbi__huffman huff_dc[4];
+   stbi__huffman huff_ac[4];
+   stbi_uc dequant[4][64];
+
+// 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;
+      stbi_uc *linebuf;
+   } 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 scan_n, order[4];
+   int restart_interval, todo;
+} 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;
+}
+
+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};
+
+// stbi__jpeg_huff_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];
+   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];
+}
+
+// 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 m = 1 << (n-1);
+   unsigned int k;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+
+   #if 1
+   k = stbi_lrot(j->code_buffer, n);
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   #else
+   k = (j->code_buffer >> (32 - n)) & stbi__bmask[n];
+   j->code_bits -= n;
+   j->code_buffer <<= n;
+   #endif
+   // the following test is probably a random branch that won't
+   // predict well. I tried to table accelerate it but failed.
+   // maybe it's compiling as a conditional move?
+   if (k < m)
+      return (-1 << n) + k + 1;
+   else
+      return k;
+}
+
+// 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
+};
+
+// stbi__jpeg_huff_decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, int b)
+{
+   int diff,dc,k;
+   int 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;
+
+   // stbi__jpeg_huff_decode AC components, see JPEG spec
+   k = 1;
+   do {
+      int r,s;
+      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;
+         // stbi__jpeg_huff_decode into unzigzag'd location
+         data[stbi__jpeg_dezigzag[k++]] = (short) stbi__extend_receive(j,s);
+      }
+   } while (k < 64);
+   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;
+
+#ifdef STBI_SIMD
+typedef unsigned short stbi_dequantize_t;
+#else
+typedef stbi_uc stbi_dequantize_t;
+#endif
+
+// .344 seconds on 3*anemones.jpg
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64], stbi_dequantize_t *dequantize)
+{
+   int i,val[64],*v=val;
+   stbi_dequantize_t *dq = dequantize;
+   stbi_uc *o;
+   short *d = data;
+
+   // columns
+   for (i=0; i < 8; ++i,++d,++dq, ++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] * dq[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]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
+                 d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[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_SIMD
+static stbi_idct_8x8 stbi__idct_installed = stbi__idct_block;
+
+STBIDEF void stbi_install_idct(stbi_idct_8x8 func)
+{
+   stbi__idct_installed = func;
+}
+#endif
+
+#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;
+   // 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->scan_n == 1) {
+      int i,j;
+      #ifdef STBI_SIMD
+      __declspec(align(16))
+      #endif
+      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) {
+            if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
+            #ifdef STBI_SIMD
+            stbi__idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
+            #else
+            stbi__idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
+            #endif
+            // 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);
+            }
+         }
+      }
+   } else { // interleaved!
+      int i,j,k,x,y;
+      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;
+                     if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
+                     #ifdef STBI_SIMD
+                     stbi__idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
+                     #else
+                     stbi__idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
+                     #endif
+                  }
+               }
+            }
+            // 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 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;
+}
+
+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 0xC2: // stbi__SOF - progressive
+         return stbi__err("progressive jpeg","JPEG format not supported (progressive)");
+
+      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);
+            #ifdef STBI_SIMD
+            for (i=0; i < 64; ++i)
+               z->dequant2[t][i] = z->dequant[t][i];
+            #endif
+            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);
+            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 stbi__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 stbi__SOS component count","Corrupt JPEG");
+   if (Ls != 6+2*z->scan_n) return stbi__err("bad stbi__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;
+      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;
+   }
+   if (stbi__get8(z->s) != 0) return stbi__err("bad stbi__SOS","Corrupt JPEG");
+   stbi__get8(z->s); // should be 63, but might be 0
+   if (stbi__get8(z->s) != 0) return stbi__err("bad stbi__SOS","Corrupt JPEG");
+
+   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 stbi__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 stbi__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 != 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 stbi__jpeg_huff_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 (stbi__err.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 stbi__jpeg_huff_decode
+      // the bogus oversized data from using interleaved MCUs and their
+      // big blocks (stbi__err.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 = 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) {
+            free(z->img_comp[i].raw_data);
+            z->img_comp[i].data = NULL;
+         }
+         return stbi__err("outofmem", "Out of memory");
+      }
+      // align blocks for installable-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;
+   }
+
+   return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (stbi__err.g. stbi__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)
+#define stbi__SOS(x)         ((x) == 0xda)
+
+static int 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 stbi__SOI","Corrupt JPEG");
+   if (scan == 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 stbi__SOF", "Corrupt JPEG");
+         m = stbi__get_marker(z);
+      }
+   }
+   if (!stbi__process_frame_header(z, scan)) return 0;
+   return 1;
+}
+
+static int decode_jpeg_image(stbi__jpeg *j)
+{
+   int m;
+   j->restart_interval = 0;
+   if (!decode_jpeg_header(j, 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 0;
+               }
+            }
+            // 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);
+   }
+   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;
+}
+
+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;
+}
+
+#define float2fixed(x)  ((int) ((x) * 65536 + 0.5))
+
+// 0.38 seconds on 3*anemones.jpg   (0.25 with processor = Pro)
+// VC6 without processor=Pro is generating multiple LEAs per multiply!
+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;
+   }
+}
+
+#ifdef STBI_SIMD
+static stbi_YCbCr_to_RGB_run stbi__YCbCr_installed = stbi__YCbCr_to_RGB_row;
+
+STBIDEF void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func)
+{
+   stbi__YCbCr_installed = func;
+}
+#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].data) {
+         free(j->img_comp[i].raw_data);
+         j->img_comp[i].data = NULL;
+      }
+      if (j->img_comp[i].linebuf) {
+         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;
+   // validate req_comp
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+   z->s->img_n = 0;
+
+   // load a jpeg image from whichever source
+   if (!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 *) 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 = stbi__resample_row_hv_2;
+         else                               r->resample = stbi__resample_row_generic;
+      }
+
+      // can't error after this so, this is safe
+      output = (stbi_uc *) 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) {
+               #ifdef STBI_SIMD
+               stbi__YCbCr_installed(out, y, coutput[1], coutput[2], z->s->img_x, n);
+               #else
+               stbi__YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s->img_x, n);
+               #endif
+            } 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;
+   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;
+   r = decode_jpeg_header(&j, SCAN_type);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
+{
+   if (!decode_jpeg_header(j, 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);
+}
+
+// public domain zlib stbi__jpeg_huff_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
+
+// 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)
+{
+   assert(bits <= 16);
+   // to bit reverse n bits, reverse 16 and shift
+   // stbi__err.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, 255, sizeof(z->fast));
+   for (i=0; i < num; ++i) 
+      ++sizes[sizelist[i]];
+   sizes[0] = 0;
+   for (i=1; i < 16; ++i)
+      assert(sizes[i] <= (1 << i));
+   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 JPEG");
+      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];
+         z->size [c] = (stbi_uc     ) s;
+         z->value[c] = (stbi__uint16) i;
+         if (s <= STBI__ZFAST_BITS) {
+            int k = stbi__bit_reverse(next_code[s],s);
+            while (k < (1 << STBI__ZFAST_BITS)) {
+               z->fast[k] = (stbi__uint16) c;
+               k += (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 {
+      assert(z->code_buffer < (1U << z->num_bits));
+      z->code_buffer |= 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;   
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s,k;
+   if (a->num_bits < 16) stbi__fill_bits(a);
+   b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+   if (b < 0xffff) {
+      s = z->size[b];
+      a->code_buffer >>= s;
+      a->num_bits -= s;
+      return z->value[b];
+   }
+
+   // 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];
+   assert(z->size[b] == s);
+   a->code_buffer >>= s;
+   a->num_bits -= s;
+   return z->value[b];
+}
+
+static int stbi__zexpand(stbi__zbuf *z, int n)  // need to make room for n bytes
+{
+   char *q;
+   int cur, limit;
+   if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
+   cur   = (int) (z->zout     - z->zout_start);
+   limit = (int) (z->zout_end - z->zout_start);
+   while (cur + n > limit)
+      limit *= 2;
+   q = (char *) realloc(z->zout_start, 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)
+{
+   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 (a->zout >= a->zout_end) if (!stbi__zexpand(a, 1)) return 0;
+         *a->zout++ = (char) z;
+      } else {
+         stbi_uc *p;
+         int len,dist;
+         if (z == 256) 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 (a->zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
+         if (a->zout + len > a->zout_end) if (!stbi__zexpand(a, len)) return 0;
+         p = (stbi_uc *) (a->zout - dist);
+         while (len--)
+            *a->zout++ = *p++;
+      }
+   }
+}
+
+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);
+      assert(c >= 0 && c < 19);
+      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 {
+         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;
+   }
+   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, 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 *) 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 {
+      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 *) 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 {
+      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 *) 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 {
+      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;
+}
+
+// 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
+
+
+typedef struct
+{
+   stbi__uint32 length;
+   stbi__uint32 type;
+} stbi__pngchunk;
+
+#define PNG_TYPE(a,b,c,d)  (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+
+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,
+   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;
+}
+
+#define STBI__BYTECAST(x)  ((stbi_uc) ((x) & 255))  // truncate int to byte without warnings
+
+// 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)
+{
+   stbi__context *s = a->s;
+   stbi__uint32 i,j,stride = x*out_n;
+   int k;
+   int img_n = s->img_n; // copy it into a local for later
+   assert(out_n == s->img_n || out_n == s->img_n+1);
+   a->out = (stbi_uc *) malloc(x * y * out_n);
+   if (!a->out) return stbi__err("outofmem", "Out of memory");
+   if (s->img_x == x && s->img_y == y) {
+      if (raw_len != (img_n * x + 1) * y) return stbi__err("not enough pixels","Corrupt PNG");
+   } else { // interlaced:
+      if (raw_len < (img_n * x + 1) * y) return stbi__err("not enough pixels","Corrupt PNG");
+   }
+   for (j=0; j < y; ++j) {
+      stbi_uc *cur = a->out + stride*j;
+      stbi_uc *prior = cur - stride;
+      int filter = *raw++;
+      if (filter > 4) return stbi__err("invalid filter","Corrupt PNG");
+      // if first row, use special filter that doesn't sample previous row
+      if (j == 0) filter = first_row_filter[filter];
+      // handle first pixel explicitly
+      for (k=0; k < img_n; ++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 (img_n != out_n) cur[img_n] = 255;
+      raw += img_n;
+      cur += out_n;
+      prior += out_n;
+      // this is a little gross, so that we don't switch per-pixel or per-component
+      if (img_n == out_n) {
+         #define CASE(f) \
+             case f:     \
+                for (i=x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_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-img_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-img_n])>>1)); break;
+            CASE(STBI__F_paeth)        cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-img_n],prior[k],prior[k-img_n])); break;
+            CASE(STBI__F_avg_first)    cur[k] = STBI__BYTECAST(raw[k] + (cur[k-img_n] >> 1)); break;
+            CASE(STBI__F_paeth_first)  cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-img_n],0,0)); break;
+         }
+         #undef CASE
+      } else {
+         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
+      }
+   }
+   return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, int interlaced)
+{
+   stbi_uc *final;
+   int p;
+   if (!interlaced)
+      return stbi__create_png_image_raw(a, raw, raw_len, out_n, a->s->img_x, a->s->img_y);
+
+   // de-interlacing
+   final = (stbi_uc *) 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) {
+         if (!stbi__create_png_image_raw(a, raw, raw_len, out_n, x, y)) {
+            free(final);
+            return 0;
+         }
+         for (j=0; j < y; ++j)
+            for (i=0; i < x; ++i)
+               memcpy(final + (j*yspc[p]+yorig[p])*a->s->img_x*out_n + (i*xspc[p]+xorig[p])*out_n,
+                      a->out + (j*x+i)*out_n, out_n);
+         free(a->out);
+         raw += (x*out_n+1)*y;
+         raw_len -= (x*out_n+1)*y;
+      }
+   }
+   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
+   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 *) 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;
+      }
+   }
+   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 {
+      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;
+         }
+      }
+   }
+}
+
+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, 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 == SCAN_type) return 1;
+
+   for (;;) {
+      stbi__pngchunk c = stbi__get_chunk_header(s);
+      switch (c.type) {
+         case PNG_TYPE('C','g','B','I'):
+            is_iphone = 1;
+            stbi__skip(s, c.length);
+            break;
+         case PNG_TYPE('I','H','D','R'): {
+            int depth,color,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 != 8)        return stbi__err("8bit only","PNG not supported: 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 stbi__jpeg_huff_decode");
+               if (scan == 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 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 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 == 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); // non 8-bit images will be larger
+            }
+            break;
+         }
+
+         case 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 == SCAN_header) { s->img_n = pal_img_n; return 1; }
+            if (ioff + c.length > 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;
+               p = (stbi_uc *) realloc(z->idata, 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 PNG_TYPE('I','E','N','D'): {
+            stbi__uint32 raw_len;
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (scan != SCAN_load) return 1;
+            if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
+            z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, 16384, (int *) &raw_len, !is_iphone);
+            if (z->expanded == NULL) return 0; // zlib should set error
+            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, 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;
+            }
+            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, 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_n;
+   }
+   free(p->out);      p->out      = NULL;
+   free(p->expanded); p->expanded = NULL;
+   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, 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);
+}
+
+// Microsoft/Windows BMP image
+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;
+}
+
+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, fake_a=0;
+   stbi_uc pal[256][4];
+   int psize=0,i,j,compress=0,width;
+   int bpp, flip_vertically, pad, target, offset, 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
+   offset = stbi__get32le(s);
+   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");
+   bpp = stbi__get16le(s);
+   if (bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
+   flip_vertically = ((int) s->img_y) > 0;
+   s->img_y = abs((int) s->img_y);
+   if (hsz == 12) {
+      if (bpp < 24)
+         psize = (offset - 14 - 24) / 3;
+   } else {
+      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 (bpp == 16 || bpp == 32) {
+            mr = mg = mb = 0;
+            if (compress == 0) {
+               if (bpp == 32) {
+                  mr = 0xffu << 16;
+                  mg = 0xffu <<  8;
+                  mb = 0xffu <<  0;
+                  ma = 0xffu << 24;
+                  fake_a = 1; // @TODO: check for cases like alpha value is all 0 and switch it to 255
+                  STBI_NOTUSED(fake_a);
+               } else {
+                  mr = 31u << 10;
+                  mg = 31u <<  5;
+                  mb = 31u <<  0;
+               }
+            } else if (compress == 3) {
+               mr = stbi__get32le(s);
+               mg = stbi__get32le(s);
+               mb = stbi__get32le(s);
+               // not documented, but generated by photoshop and handled by mspaint
+               if (mr == mg && mg == mb) {
+                  // ?!?!?
+                  return stbi__errpuc("bad BMP", "bad BMP");
+               }
+            } else
+               return stbi__errpuc("bad BMP", "bad BMP");
+         }
+      } else {
+         assert(hsz == 108 || hsz == 124);
+         mr = stbi__get32le(s);
+         mg = stbi__get32le(s);
+         mb = stbi__get32le(s);
+         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
+         }
+      }
+      if (bpp < 16)
+         psize = (offset - 14 - hsz) >> 2;
+   }
+   s->img_n = ma ? 4 : 3;
+   if (req_comp && req_comp >= 3) // we can directly stbi__jpeg_huff_decode 3 or 4
+      target = req_comp;
+   else
+      target = s->img_n; // if they want monochrome, we'll post-convert
+   out = (stbi_uc *) malloc(target * s->img_x * s->img_y);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   if (bpp < 16) {
+      int z=0;
+      if (psize == 0 || psize > 256) { 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 (hsz != 12) stbi__get8(s);
+         pal[i][3] = 255;
+      }
+      stbi__skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4));
+      if (bpp == 4) width = (s->img_x + 1) >> 1;
+      else if (bpp == 8) width = s->img_x;
+      else { 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 (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 = (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, offset - 14 - hsz);
+      if (bpp == 24) width = 3 * s->img_x;
+      else if (bpp == 16) width = 2*s->img_x;
+      else /* bpp = 32 and pad = 0 */ width=0;
+      pad = (-width) & 3;
+      if (bpp == 24) {
+         easy = 1;
+      } else if (bpp == 32) {
+         if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+            easy = 2;
+      }
+      if (!easy) {
+         if (!mr || !mg || !mb) { 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);
+               if (target == 4) out[z++] = a;
+            }
+         } else {
+            for (i=0; i < (int) s->img_x; ++i) {
+               stbi__uint32 v = (stbi__uint32) (bpp == 16 ? 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);
+               if (target == 4) out[z++] = STBI__BYTECAST(a); 
+            }
+         }
+         stbi__skip(s, pad);
+      }
+   }
+   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;
+}
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
+{
+    int tga_w, tga_h, tga_comp;
+    int sz;
+    stbi__get8(s);                   // discard Offset
+    sz = stbi__get8(s);              // color type
+    if( sz > 1 ) {
+        stbi__rewind(s);
+        return 0;      // only RGB or indexed allowed
+    }
+    sz = stbi__get8(s);              // image type
+    // only RGB or grey allowed, +/- RLE
+    if ((sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11)) return 0;
+    stbi__skip(s,9);
+    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
+    }
+    sz = stbi__get8(s);               // bits per pixel
+    // only RGB or RGBA or grey allowed
+    if ((sz != 8) && (sz != 16) && (sz != 24) && (sz != 32)) {
+        stbi__rewind(s);
+        return 0;
+    }
+    tga_comp = sz;
+    if (x) *x = tga_w;
+    if (y) *y = tga_h;
+    if (comp) *comp = tga_comp / 8;
+    return 1;                   // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context *s)
+{
+   int res;
+   int sz;
+   stbi__get8(s);      //   discard Offset
+   sz = stbi__get8(s);   //   color type
+   if ( sz > 1 ) return 0;   //   only RGB or indexed allowed
+   sz = stbi__get8(s);   //   image type
+   if ( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0;   //   only RGB or grey allowed, +/- RLE
+   stbi__get16be(s);      //   discard palette start
+   stbi__get16be(s);      //   discard palette length
+   stbi__get8(s);         //   discard bits per palette color entry
+   stbi__get16be(s);      //   discard x origin
+   stbi__get16be(s);      //   discard y origin
+   if ( stbi__get16be(s) < 1 ) return 0;      //   test width
+   if ( stbi__get16be(s) < 1 ) return 0;      //   test height
+   sz = stbi__get8(s);   //   bits per pixel
+   if ( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) )
+      res = 0;
+   else
+      res = 1;
+   stbi__rewind(s);
+   return res;
+}
+
+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_bits_per_pixel / 8;
+   int tga_inverted = stbi__get8(s);
+   //   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;
+   }
+   /* int tga_alpha_bits = tga_inverted & 15; */
+   tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+   //   error check
+   if ( //(tga_indexed) ||
+      (tga_width < 1) || (tga_height < 1) ||
+      (tga_image_type < 1) || (tga_image_type > 3) ||
+      ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
+      (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32))
+      )
+   {
+      return NULL; // we don't report this as a bad TGA because we don't even know if it's TGA
+   }
+
+   //   If I'm paletted, then I'll use the number of bits from the palette
+   if ( tga_indexed )
+   {
+      tga_comp = tga_palette_bits / 8;
+   }
+
+   //   tga info
+   *x = tga_width;
+   *y = tga_height;
+   if (comp) *comp = tga_comp;
+
+   tga_data = (unsigned char*)malloc( 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) {
+      for (i=0; i < tga_height; ++i) {
+         int y = tga_inverted ? tga_height -i - 1 : i;
+         stbi_uc *tga_row = tga_data + y*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*)malloc( tga_palette_len * tga_palette_bits / 8 );
+         if (!tga_palette) {
+            free(tga_data);
+            return stbi__errpuc("outofmem", "Out of memory");
+         }
+         if (!stbi__getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) {
+            free(tga_data);
+            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 1 byte, then perform the lookup
+               int pal_idx = stbi__get8(s);
+               if ( pal_idx >= tga_palette_len )
+               {
+                  //   invalid index
+                  pal_idx = 0;
+               }
+               pal_idx *= tga_bits_per_pixel / 8;
+               for (j = 0; j*8 < tga_bits_per_pixel; ++j)
+               {
+                  raw_data[j] = tga_palette[pal_idx+j];
+               }
+            } else
+            {
+               //   read in the data raw
+               for (j = 0; j*8 < tga_bits_per_pixel; ++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 )
+      {
+         free( tga_palette );
+      }
+   }
+
+   // swap RGB
+   if (tga_comp >= 3)
+   {
+      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;
+}
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+
+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 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.
+   if (stbi__get16be(s) != 8)
+      return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 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 *) 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 = (channel == 3 ? 255 : 0), p += 4;
+         } 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.
+            for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4;
+         } else {
+            // Read the data.
+            for (i = 0; i < pixelCount; i++)
+               *p = stbi__get8(s), p += 4;
+         }
+      }
+   }
+
+   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 = channelCount;
+   *y = h;
+   *x = w;
+   
+   return out;
+}
+
+// *************************************************************************************************
+// 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/
+
+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];
+                     int i;
+
+                     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 stbi__jpeg_huff_decode");
+
+   stbi__get32be(s); //skip `ratio'
+   stbi__get16be(s); //skip `fields'
+   stbi__get16be(s); //skip `pad'
+
+   // intermediate buffer is RGBA
+   result = (stbi_uc *) malloc(x*y*4);
+   memset(result, 0xff, x*y*4);
+
+   if (!stbi__pic_load_core(s,x,y,comp, result)) {
+      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;
+}
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+typedef struct 
+{
+   stbi__int16 prefix;
+   stbi_uc first;
+   stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct
+{
+   int w,h;
+   stbi_uc *out;                 // output buffer (always 4 components)
+   int flags, bgindex, ratio, transparent, eflags;
+   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 ? 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 stbi__jpeg_huff_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, code;
+   stbi__uint32 first;
+   stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+   stbi__gif_lzw *p;
+
+   lzw_cs = stbi__get8(s);
+   clear = 1 << lzw_cs;
+   first = 1;
+   codesize = lzw_cs + 1;
+   codemask = (1 << codesize) - 1;
+   bits = 0;
+   valid_bits = 0;
+   for (code = 0; code < clear; code++) {
+      g->codes[code].prefix = -1;
+      g->codes[code].first = (stbi_uc) code;
+      g->codes[code].suffix = (stbi_uc) 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 i;
+   stbi_uc *c = g->pal[g->bgindex];
+   // @OPTIMIZE: write a dword at a time
+   for (i = 0; i < g->w * g->h * 4; i += 4) {
+      stbi_uc *p  = &g->out[i];
+      p[0] = c[2];
+      p[1] = c[1];
+      p[2] = c[0];
+      p[3] = c[3];
+   }
+}
+
+// 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 *old_out = 0;
+
+   if (g->out == 0) {
+      if (!stbi__gif_header(s, g, comp,0))     return 0; // stbi__g_failure_reason set by stbi__gif_header
+      g->out = (stbi_uc *) malloc(4 * g->w * g->h);
+      if (g->out == 0)                      return stbi__errpuc("outofmem", "Out of memory");
+      stbi__fill_gif_background(g);
+   } else {
+      // animated-gif-only path
+      if (((g->eflags & 0x1C) >> 2) == 3) {
+         old_out = g->out;
+         g->out = (stbi_uc *) malloc(4 * g->w * g->h);
+         if (g->out == 0)                   return stbi__errpuc("outofmem", "Out of memory");
+         memcpy(g->out, old_out, g->w*g->h*4);
+      }
+   }
+    
+   for (;;) {
+      switch (stbi__get8(s)) {
+         case 0x2C: /* Image Descriptor */
+         {
+            stbi__int32 x, y, w, h;
+            stbi_uc *o;
+
+            x = stbi__get16le(s);
+            y = stbi__get16le(s);
+            w = stbi__get16le(s);
+            h = stbi__get16le(s);
+            if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+               return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+
+            g->line_size = g->w * 4;
+            g->start_x = x * 4;
+            g->start_y = y * g->line_size;
+            g->max_x   = g->start_x + w * 4;
+            g->max_y   = g->start_y + h * g->line_size;
+            g->cur_x   = g->start_x;
+            g->cur_y   = g->start_y;
+
+            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) {
+               for (i=0; i < 256; ++i)  // @OPTIMIZE: stbi__jpeg_reset only the previous transparent
+                  g->pal[i][3] = 255; 
+               if (g->transparent >= 0 && (g->eflags & 0x01))
+                  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 (req_comp && req_comp != 4)
+               o = stbi__convert_format(o, 4, req_comp, g->w, g->h);
+            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);
+                  stbi__get16le(s); // delay
+                  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 *) 1;
+
+         default:
+            return stbi__errpuc("unknown code", "Corrupt GIF");
+      }
+   }
+}
+
+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={0};
+
+   u = stbi__gif_load_next(s, &g, comp, req_comp);
+   if (u == (void *) 1) u = 0;  // end of animated gif marker
+   if (u) {
+      *x = g.w;
+      *y = g.h;
+   }
+
+   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);
+}
+
+
+// *************************************************************************************************
+// 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 *) 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;
+            free(scanline);
+            goto main_decode_loop; // yes, this makes no sense
+         }
+         len <<= 8;
+         len |= stbi__get8(s);
+         if (len != width) { free(hdr_data); free(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
+         if (scanline == NULL) scanline = (stbi_uc *) 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);
+      }
+      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 (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 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
+
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int hsz;
+   if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') {
+       stbi__rewind( s );
+       return 0;
+   }
+   stbi__skip(s,12);
+   hsz = stbi__get32le(s);
+   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (hsz == 12) {
+      *x = stbi__get16le(s);
+      *y = stbi__get16le(s);
+   } else {
+      *x = stbi__get32le(s);
+      *y = stbi__get32le(s);
+   }
+   if (stbi__get16le(s) != 1) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *comp = stbi__get16le(s) / 8;
+   return 1;
+}
+
+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;
+}
+
+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];
+
+   stbi__skip(s, 92);
+
+   *x = stbi__get16be(s);
+   *y = stbi__get16be(s);
+   if (stbi__at_eof(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;
+}
+
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
+{
+   if (stbi__jpeg_info(s, x, y, comp))
+       return 1;
+   if (stbi__png_info(s, x, y, comp))
+       return 1;
+   if (stbi__gif_info(s, x, y, comp))
+       return 1;
+   if (stbi__bmp_info(s, x, y, comp))
+       return 1;
+   if (stbi__psd_info(s, x, y, comp))
+       return 1;
+   if (stbi__pic_info(s, x, y, comp))
+       return 1;
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_info(s, x, y, comp))
+       return 1;
+   #endif
+   // test tga last because it's a crappy test!
+   if (stbi__tga_info(s, x, y, comp))
+       return 1;
+   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 = 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
+
+#if !defined(STBI_NO_STDIO) && defined(_MSC_VER) && _MSC_VER >= 1400 && !defined(_CRT_SECURE_NO_WARNINGS)
+#pragma warning(pop)
+#endif
+
+
+/*
+   revision history:
+      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   first released version
+*/

3rdparty/stb_truetype/stb_truetype.h → 3rdparty/stb/stb_truetype.h

@@ -1,5 +1,5 @@
-// stb_truetype.h - v0.6c - public domain
-// authored from 2009-2012 by Sean Barrett / RAD Game Tools
+// stb_truetype.h - v0.8 - public domain
+// authored from 2009-2013 by Sean Barrett / RAD Game Tools
 //
 //   This library processes TrueType files:
 //        parse files
@@ -27,9 +27,15 @@
 //       stoiko (Haemimont Games)
 //       Brian Hook 
 //       Walter van Niftrik
+//       David Gow
+//       David Given
+//       Ivan-Assen Ivanov
+//       Anthony Pesch
 //
 // VERSION HISTORY
 //
+//   0.8  (2014-05-25) fix a few more warnings
+//   0.7  (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
 //   0.6c (2012-07-24) improve documentation
 //   0.6b (2012-07-20) fix a few more warnings
 //   0.6  (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
@@ -222,7 +228,7 @@ void my_stbtt_print(float x, float y, char *text)
    while (*text) {
       if (*text >= 32 && *text < 128) {
          stbtt_aligned_quad q;
-         stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl,0=old d3d
+         stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
          glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
          glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
          glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
@@ -291,7 +297,7 @@ int main(int arg, char **argv)
 {
    stbtt_fontinfo font;
    int i,j,ascent,baseline,ch=0;
-   float scale, xpos=0;
+   float scale, xpos=2; // leave a little padding in case the character extends left
    char *text = "Heljo World!";
 
    fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
@@ -363,10 +369,15 @@ int main(int arg, char **argv)
    #define STBTT_iceil(x)    ((int) ceil(x))
    #endif
 
+   #ifndef STBTT_sqrt
+   #include <math.h>
+   #define STBTT_sqrt(x)      sqrt(x)
+   #endif
+
    // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
    #ifndef STBTT_malloc
-   #include <malloc.h>
-   #define STBTT_malloc(x,u)  malloc(x)
+   #include <stdlib.h>
+   #define STBTT_malloc(x,u)  ((void)(u),malloc(x))
    #define STBTT_free(x,u)    free(x)
    #endif
 
@@ -531,7 +542,6 @@ extern void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint
 
 extern int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
 // an additional amount to add to the 'advance' value between ch1 and ch2
-// @TODO; for now always returns 0!
 
 extern int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
 // Gets the bounding box of the visible part of the glyph, in unscaled coordinates
@@ -573,6 +583,13 @@ extern int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codep
 extern int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
 // returns # of vertices and fills *vertices with the pointer to them
 //   these are expressed in "unscaled" coordinates
+//
+// The shape is a series of countours. Each one starts with
+// a STBTT_moveto, then consists of a series of mixed
+// STBTT_lineto and STBTT_curveto segments. A lineto
+// draws a line from previous endpoint to its x,y; a curveto
+// draws a quadratic bezier from previous endpoint to
+// its x,y, using cx,cy as the bezier control point.
 
 extern void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
 // frees the data allocated above
@@ -916,8 +933,6 @@ int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
       search -= 2;
       while (entrySelector) {
          searchRange >>= 1;
-         start = ttUSHORT(data + search + 2 + segcount*2 + 2);
-         end = ttUSHORT(data + search + 2);
          start = ttUSHORT(data + search + searchRange*2 + segcount*2 + 2);
          end = ttUSHORT(data + search + searchRange*2);
          if (unicode_codepoint > end)
@@ -1222,8 +1237,8 @@ int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_verte
          }
          
          // Find transformation scales.
-         m = (float) sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
-         n = (float) sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
+         m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
+         n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
 
          // Get indexed glyph.
          comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
@@ -1246,8 +1261,8 @@ int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_verte
                if (comp_verts) STBTT_free(comp_verts, info->userdata);
                return 0;
             }
-            if (num_vertices > 0) memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
-            memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
+            if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
+            STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
             if (vertices) STBTT_free(vertices, info->userdata);
             vertices = tmp;
             STBTT_free(comp_verts, info->userdata);
@@ -1759,7 +1774,7 @@ unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float sc
       scale_y = scale_x;
    }
 
-   stbtt_GetGlyphBitmapBox(info, glyph, scale_x, scale_y, &ix0,&iy0,&ix1,&iy1);
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
 
    // now we get the size
    gbm.w = (ix1 - ix0);
@@ -1991,14 +2006,16 @@ static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name,
 
          // is this a Unicode encoding?
          if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
-            stbtt_int32 slen = ttUSHORT(fc+loc+8), off = ttUSHORT(fc+loc+10);
+            stbtt_int32 slen = ttUSHORT(fc+loc+8);
+            stbtt_int32 off = ttUSHORT(fc+loc+10);
 
             // check if there's a prefix match
             stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
             if (matchlen >= 0) {
                // check for target_id+1 immediately following, with same encoding & language
                if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
-                  stbtt_int32 slen = ttUSHORT(fc+loc+12+8), off = ttUSHORT(fc+loc+12+10);
+                  slen = ttUSHORT(fc+loc+12+8);
+                  off = ttUSHORT(fc+loc+12+10);
                   if (slen == 0) {
                      if (matchlen == nlen)
                         return 1;

examples/20-nanovg/blendish.h

@@ -25,12 +25,6 @@ THE SOFTWARE.
 #ifndef BLENDISH_H
 #define BLENDISH_H
 
-#if BX_COMPILER_MSVC
-#	pragma warning(push)
-#	pragma warning(disable: 4305) // warning C4305: 'initializing' : truncation from 'double' to 'float'
-#	pragma warning(disable: 4244) // warning C4244: 'return' : conversion from 'int' to 'float', possible loss of data
-#endif // BX_COMPILER_MSVC
-
 #ifndef NANOVG_H
 #error "nanovg.h must be included first."
 #endif
@@ -808,6 +802,13 @@ BND_EXPORT void bndRadioButton(NVGcontext *ctx,
     float x, float y, float w, float h, int flags, BNDwidgetState state, 
     int iconid, const char *label);
     
+
+// Calculate the corresponding text position for given coordinates px/py
+// in a text field.
+// See bndTextField for more info.
+BND_EXPORT int bndTextFieldTextPosition(NVGcontext *ctx, float x, float y, float w, float h,
+    int iconid, const char *text, int px, int py);
+
 // Draw a text field with its lower left origin at (x,y) and size of (w,h),
 // where flags is one or multiple flags from BNDcornerFlags and state denotes
 // the widgets current UI state.
@@ -916,6 +917,11 @@ BND_EXPORT void bndNodePort(NVGcontext *ctx, float x, float y, BNDwidgetState st
 BND_EXPORT void bndNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1,
     BNDwidgetState state0, BNDwidgetState state1);
 
+// Draw a node wire originating at (x0,y0) and floating to (x1,y1), with
+// a colored gradient based on the two colors color0 and color1
+BND_EXPORT void bndColoredNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1,
+    NVGcolor color0, NVGcolor color1);
+
 // Draw a node background with its upper left origin at (x,y) and size of (w,h)
 // where titleColor provides the base color for the title bar
 BND_EXPORT void bndNodeBackground(NVGcontext *ctx, float x, float y, float w, float h,
@@ -1045,6 +1051,12 @@ BND_EXPORT void bndIconLabelValue(NVGcontext *ctx, float x, float y, float w, fl
 BND_EXPORT void bndNodeIconLabel(NVGcontext *ctx, float x, float y, float w, float h,
     int iconid, NVGcolor color, NVGcolor shadowColor, int align, 
     float fontsize, const char *label);
+
+// Calculate the corresponding text position for given coordinates px/py
+// in an iconLabel.
+// See bndIconLabelCaret for more info.
+BND_EXPORT int bndIconLabelTextPosition(NVGcontext *ctx, float x, float y, float w, float h,
+    int iconid, float fontsize, const char *label, int px, int py);
     
 // Draw an optional icon specified by <iconid>, an optional label and 
 // a caret with given fontsize and color within a widget box.
@@ -1095,6 +1107,8 @@ BND_EXPORT NVGcolor bndNodeWireColor(const BNDnodeTheme *theme, BNDwidgetState s
 #ifdef _MSC_VER
     #pragma warning (disable: 4996) // Switch off security warnings
     #pragma warning (disable: 4100) // Switch off unreferenced formal parameter warnings
+    #pragma warning (disable: 4244)
+    #pragma warning (disable: 4305)
     #ifdef __cplusplus
     #define BND_INLINE inline
     #else
@@ -1207,6 +1221,9 @@ inline double bnd_fmax ( double a, double b )
 // max glyphs for position testing
 #define BND_MAX_GLYPHS 1024
 
+// max rows for position testing
+#define BND_MAX_ROWS 32
+
 // text distance from bottom
 #define BND_TEXT_PAD_DOWN 7
 
@@ -1444,6 +1461,12 @@ void bndRadioButton(NVGcontext *ctx,
         BND_LABEL_FONT_SIZE, label, NULL);
 }
 
+int bndTextFieldTextPosition(NVGcontext *ctx, float x, float y, float w, float h,
+    int iconid, const char *text, int px, int py) {
+    return bndIconLabelTextPosition(ctx, x, y, w, h,
+        iconid, BND_LABEL_FONT_SIZE, text, px, py);
+}
+
 void bndTextField(NVGcontext *ctx, 
     float x, float y, float w, float h, int flags, BNDwidgetState state, 
     int iconid, const char *text, int cbegin, int cend) {
@@ -1678,9 +1701,10 @@ void bndNodePort(NVGcontext *ctx, float x, float y, BNDwidgetState state,
     nvgFill(ctx);
 }
 
-void bndNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1, 
-    BNDwidgetState state0, BNDwidgetState state1) {
-    float delta = fabsf(x1 - x0)*(float)bnd_theme.nodeTheme.noodleCurving/10.0f;
+void bndColoredNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1,
+    NVGcolor color0, NVGcolor color1) {
+    float length = bnd_fmaxf(fabsf(x1 - x0),fabsf(y1 - y0));
+    float delta = length*(float)bnd_theme.nodeTheme.noodleCurving/10.0f;
     
     nvgBeginPath(ctx);
     nvgMoveTo(ctx, x0, y0);
@@ -1688,17 +1712,26 @@ void bndNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1,
         x0 + delta, y0,
         x1 - delta, y1,
         x1, y1);
-    nvgStrokeColor(ctx, bnd_theme.nodeTheme.wiresColor);
+    NVGcolor colorw = bnd_theme.nodeTheme.wiresColor;
+    colorw.a = (color0.a<color1.a)?color0.a:color1.a;
+    nvgStrokeColor(ctx, colorw);
     nvgStrokeWidth(ctx, BND_NODE_WIRE_OUTLINE_WIDTH);
     nvgStroke(ctx);
     nvgStrokePaint(ctx, nvgLinearGradient(ctx, 
         x0, y0, x1, y1, 
-        bndNodeWireColor(&bnd_theme.nodeTheme, state0),
-        bndNodeWireColor(&bnd_theme.nodeTheme, state1)));
+        color0,
+        color1));
     nvgStrokeWidth(ctx,BND_NODE_WIRE_WIDTH);
     nvgStroke(ctx);
 }
 
+void bndNodeWire(NVGcontext *ctx, float x0, float y0, float x1, float y1,
+    BNDwidgetState state0, BNDwidgetState state1) {
+    bndColoredNodeWire(ctx, x0, y0, x1, y1,
+        bndNodeWireColor(&bnd_theme.nodeTheme, state0),
+        bndNodeWireColor(&bnd_theme.nodeTheme, state1));
+}
+
 void bndNodeBackground(NVGcontext *ctx, float x, float y, float w, float h,
     BNDwidgetState state, int iconid, const char *label, NVGcolor titleColor) {
     bndInnerBox(ctx,x,y,w,BND_NODE_TITLE_HEIGHT+2,
@@ -1735,9 +1768,11 @@ void bndNodeBackground(NVGcontext *ctx, float x, float y, float w, float h,
     bndOutlineBox(ctx,x,y,w,h+1,
         BND_NODE_RADIUS,BND_NODE_RADIUS,BND_NODE_RADIUS,BND_NODE_RADIUS,
         bndTransparent(borderColor));
+    /*
     bndNodeArrowDown(ctx, 
         x + BND_NODE_MARGIN_SIDE, y + BND_NODE_TITLE_HEIGHT-4, 
         BND_NODE_ARROW_SIZE, arrowColor);
+    */
     bndDropShadow(ctx,x,y,w,h,BND_NODE_RADIUS,
         BND_SHADOW_FEATHER,BND_SHADOW_ALPHA);
 }
@@ -2118,17 +2153,17 @@ void bndIconLabelValue(NVGcontext *ctx, float x, float y, float w, float h,
                     + nvgTextBounds(ctx, 1, 1, value, NULL, NULL);
                 x += ((w-BND_PAD_RIGHT-pleft)-width)*0.5f;
             }
-            y += h-BND_TEXT_PAD_DOWN;
+            y += BND_WIDGET_HEIGHT-BND_TEXT_PAD_DOWN;
             nvgText(ctx, x, y, label, NULL);
             x += label_width;
             nvgText(ctx, x, y, BND_LABEL_SEPARATOR, NULL);
             x += sep_width;
-            nvgText(ctx, x, y, value, NULL);            
+            nvgText(ctx, x, y, value, NULL);
         } else {
             nvgTextAlign(ctx, 
                 (align==BND_LEFT)?(NVG_ALIGN_LEFT|NVG_ALIGN_BASELINE):
                 (NVG_ALIGN_CENTER|NVG_ALIGN_BASELINE));
-            nvgTextBox(ctx,x+pleft,y+h-BND_TEXT_PAD_DOWN,
+            nvgTextBox(ctx,x+pleft,y+BND_WIDGET_HEIGHT-BND_TEXT_PAD_DOWN,
                 w-BND_PAD_RIGHT-pleft,label, NULL);
         }
     } else if (iconid >= 0) {
@@ -2138,7 +2173,7 @@ void bndIconLabelValue(NVGcontext *ctx, float x, float y, float w, float h,
 
 void bndNodeIconLabel(NVGcontext *ctx, float x, float y, float w, float h,
     int iconid, NVGcolor color, NVGcolor shadowColor, 
-    int /*align*/, float fontsize, const char *label) {
+    int align, float fontsize, const char *label) {
     if (label && (bnd_font >= 0)) {
         nvgFontFaceId(ctx, bnd_font);
         nvgFontSize(ctx, fontsize);
@@ -2158,10 +2193,70 @@ void bndNodeIconLabel(NVGcontext *ctx, float x, float y, float w, float h,
     }
 }
 
-void bndIconLabelCaret(NVGcontext *ctx, float x, float y, float w, float /*h*/,
+int bndIconLabelTextPosition(NVGcontext *ctx, float x, float y, float w, float h,
+    int iconid, float fontsize, const char *label, int px, int py) {
+    float bounds[4];
+    float pleft = BND_TEXT_RADIUS;
+    if (!label) return -1;
+    if (iconid >= 0)
+        pleft += BND_ICON_SHEET_RES;
+
+    if (bnd_font < 0) return -1;
+
+    x += pleft;
+    y += BND_WIDGET_HEIGHT - BND_TEXT_PAD_DOWN;
+
+    nvgFontFaceId(ctx, bnd_font);
+    nvgFontSize(ctx, fontsize);
+    nvgTextAlign(ctx, NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE);
+
+    w -= BND_TEXT_RADIUS + pleft;
+
+    float asc, desc, lh;
+    static NVGtextRow rows[BND_MAX_ROWS];
+    int nrows = nvgTextBreakLines(
+        ctx, label, NULL, w, rows, BND_MAX_ROWS);
+    if (nrows == 0) return 0;
+    nvgTextBoxBounds(ctx, x, y, w, label, NULL, bounds);
+    nvgTextMetrics(ctx, &asc, &desc, &lh);
+
+    // calculate vertical position
+    int row = bnd_clamp((int)((float)(py - bounds[1]) / lh), 0, nrows - 1);
+    // search horizontal position
+    static NVGglyphPosition glyphs[BND_MAX_GLYPHS];
+    int nglyphs = nvgTextGlyphPositions(
+        ctx, x, y, rows[row].start, rows[row].end + 1, glyphs, BND_MAX_GLYPHS);
+    int col, p = 0;
+    for (col = 0; col < nglyphs && glyphs[col].x < px; ++col)
+        p = glyphs[col].str - label;
+    // see if we should move one character further
+    if (col > 0 && col < nglyphs && glyphs[col].x - px < px - glyphs[col - 1].x)
+        p = glyphs[col].str - label;
+    return p;
+}
+
+static void bndCaretPosition(NVGcontext *ctx, float x, float y,
+    float desc, float lineHeight, const char *caret, NVGtextRow *rows,int nrows,
+    int *cr, float *cx, float *cy) {
+    static NVGglyphPosition glyphs[BND_MAX_GLYPHS];
+    int r,nglyphs;
+    for (r=0; r < nrows && rows[r].end < caret; ++r);
+    *cr = r;
+    *cx = x;
+    *cy = y-lineHeight-desc + r*lineHeight;
+    if (nrows == 0) return;
+    *cx = rows[r].minx;
+    nglyphs = nvgTextGlyphPositions(
+        ctx, x, y, rows[r].start, rows[r].end+1, glyphs, BND_MAX_GLYPHS);
+    for (int i=0; i < nglyphs; ++i) {
+        *cx=glyphs[i].x;
+        if (glyphs[i].str == caret) break;
+    }
+}
+
+void bndIconLabelCaret(NVGcontext *ctx, float x, float y, float w, float h,
     int iconid, NVGcolor color, float fontsize, const char *label, 
     NVGcolor caretcolor, int cbegin, int cend) {
-    float bounds[4];
     float pleft = BND_TEXT_RADIUS;
     if (!label) return;
     if (iconid >= 0) {
@@ -2181,70 +2276,37 @@ void bndIconLabelCaret(NVGcontext *ctx, float x, float y, float w, float /*h*/,
     w -= BND_TEXT_RADIUS+pleft;
 
     if (cend >= cbegin) {
-#if 1
-        float c0,c1;
-        const char *cb;const char *ce;
-        static NVGglyphPosition glyphs[BND_MAX_GLYPHS];
-        int nglyphs = nvgTextGlyphPositions(
-            ctx, x, y, label, label+cend+1, glyphs, BND_MAX_GLYPHS);
-        c0=glyphs[0].x;
-        c1=glyphs[nglyphs-1].x;
-        cb = label+cbegin; ce = label+cend;
-        // TODO: this is slow
-        for (int i=0; i < nglyphs; ++i) {
-            if (glyphs[i].str == cb)
-                c0 = glyphs[i].x;
-            if (glyphs[i].str == ce)
-                c1 = glyphs[i].x;
-        }
+        int c0r,c1r;
+        float c0x,c0y,c1x,c1y;
+        float desc,lh;
+        static NVGtextRow rows[BND_MAX_ROWS];
+        int nrows = nvgTextBreakLines(
+            ctx, label, label+cend+1, w, rows, BND_MAX_ROWS);
+        nvgTextMetrics(ctx, NULL, &desc, &lh);
+
+        bndCaretPosition(ctx, x, y, desc, lh, label+cbegin,
+            rows, nrows, &c0r, &c0x, &c0y);
+        bndCaretPosition(ctx, x, y, desc, lh, label+cend,
+            rows, nrows, &c1r, &c1x, &c1y);
         
-        nvgTextBounds(ctx,x,y,label,NULL, bounds);
         nvgBeginPath(ctx);
         if (cbegin == cend) {
             nvgFillColor(ctx, nvgRGBf(0.337,0.502,0.761));
-            nvgRect(ctx, c0-1, bounds[1], 2, bounds[3]-bounds[1]);
+            nvgRect(ctx, c0x-1, c0y, 2, lh+1);
         } else {
             nvgFillColor(ctx, caretcolor);
-            nvgRect(ctx, c0-1, bounds[1], c1-c0+1, bounds[3]-bounds[1]);
-        }
-        nvgFill(ctx);
-#else
-        float c0,c1;
-        const char *cb;
-        const char *ce;
-        const char *line;
-        int numlines;
-        cb = label+cbegin; ce = label+cend;
-        line = label;
-
-        NVGtextRow rows[2];
-        numlines = nvgTextBreakLines(ctx, line, NULL, w, rows, 2);
-
-        /*
-        int nglyphs = nvgTextGlyphPositions(
-            ctx, x, y, label, label+cend+1, glyphs, BND_MAX_GLYPHS);
-        c0=glyphs[0].x;
-        c1=glyphs[nglyphs-1].x;
-        // TODO: this is slow
-        for (int i=0; i < nglyphs; ++i) {
-            if (glyphs[i].str == cb)
-                c0 = glyphs[i].x;
-            if (glyphs[i].str == ce)
-                c1 = glyphs[i].x;
-        }
-
-        nvgTextBounds(ctx,x,y,label,NULL, bounds);
-        nvgBeginPath(ctx);
-        if (cbegin == cend) {
-            nvgFillColor(ctx, nvgRGBf(0.337,0.502,0.761));
-            nvgRect(ctx, c0-1, bounds[1], 2, bounds[3]-bounds[1]);
-        } else {
-            nvgFillColor(ctx, caretcolor);
-            nvgRect(ctx, c0-1, bounds[1], c1-c0+1, bounds[3]-bounds[1]);
+            if (c0r == c1r) {
+                nvgRect(ctx, c0x-1, c0y, c1x-c0x+1, lh+1);
+            } else {
+                int blk=c1r-c0r-1;
+                nvgRect(ctx, c0x-1, c0y, x+w-c0x+1, lh+1);
+                nvgRect(ctx, x, c1y, c1x-x+1, lh+1);
+
+                if (blk)
+                    nvgRect(ctx, x, c0y+lh, w, blk*lh+1);
+            }
         }
         nvgFill(ctx);
-        */
-#endif
     }
     
     nvgBeginPath(ctx);
@@ -2333,8 +2395,4 @@ NVGcolor bndNodeWireColor(const BNDnodeTheme *theme, BNDwidgetState state) {
 #undef BND_INLINE
 #endif
 
-#if BX_COMPILER_MSVC
-#	pragma warning(pop)
-#endif // BX_COMPILER_MSVC
-
 #endif // BLENDISH_IMPLEMENTATION

examples/20-nanovg/nanovg.cpp

@@ -32,8 +32,11 @@
 #include "entry/entry.h"
 #include "nanovg/nanovg.h"
 
+BX_PRAGMA_DIAGNOSTIC_PUSH();
+BX_PRAGMA_DIAGNOSTIC_IGNORED_GCC("-Wunused-parameter");
 #define BLENDISH_IMPLEMENTATION
 #include "blendish.h"
+BX_PRAGMA_DIAGNOSTIC_POP();
 
 #define ICON_SEARCH 0x1F50D
 #define ICON_CIRCLED_CROSS 0x2716
@@ -941,7 +944,7 @@ int loadDemoData(struct NVGcontext* vg, struct DemoData* data)
 	{
 		char file[128];
 		bx::snprintf(file, 128, "images/image%d.jpg", ii+1);
-		data->images[ii] = nvgCreateImage(vg, file);
+		data->images[ii] = nvgCreateImage(vg, file, 0);
 		if (data->images[ii] == bgfx::invalidHandle)
 		{
 			printf("Could not load %s.\n", file);
@@ -1218,14 +1221,14 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		, 0
 		);
 
-	NVGcontext* nvg = nvgCreate(512, 512, 1, 0);
+	NVGcontext* nvg = nvgCreate(1, 0);
 	bgfx::setViewSeq(0, true);
 
 	DemoData data;
 	loadDemoData(nvg, &data);
 
-	bndSetFont(nvgCreateFont(nvg, "droidsans", "font/droidsans.ttf"));
-	bndSetIconImage(nvgCreateImage(nvg, "images/blender_icons16.png"));
+	bndSetFont(nvgCreateFont(nvg, "droidsans", "font/droidsans.ttf") );
+	bndSetIconImage(nvgCreateImage(nvg, "images/blender_icons16.png", 0) );
 
 	int64_t timeOffset = bx::getHPCounter();
 
@@ -1248,7 +1251,7 @@ int _main_(int /*_argc*/, char** /*_argv*/)
 		bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/20-nanovg");
 		bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: NanoVG is small antialiased vector graphics rendering library.");
 
-		nvgBeginFrame(nvg, width, height, 1.0f, NVG_STRAIGHT_ALPHA);
+		nvgBeginFrame(nvg, width, height, 1.0f);
 
 		renderDemo(nvg, float(mouseState.m_mx), float(mouseState.m_my), float(width), float(height), time, 0, &data);
 

examples/common/entry/cmd.cpp

@@ -12,8 +12,9 @@
 
 #include "dbg.h"
 #include "cmd.h"
-#include <string>
+
 #include <tinystl/allocator.h>
+#include <tinystl/string.h>
 #include <tinystl/unordered_map.h>
 namespace stl = tinystl;
 
@@ -62,14 +63,14 @@ struct CmdContext
 
 				case -1:
 					{
-						std::string tmp(_cmd, next-_cmd - (*next == '\0' ? 0 : 1) );
+						stl::string tmp(_cmd, next-_cmd - (*next == '\0' ? 0 : 1) );
 						DBG("Command '%s' doesn't exist.", tmp.c_str() );
 					}
 					break;
 
 				default:
 					{
-						std::string tmp(_cmd, next-_cmd - (*next == '\0' ? 0 : 1) );
+						stl::string tmp(_cmd, next-_cmd - (*next == '\0' ? 0 : 1) );
 						DBG("Failed '%s' err: %d.", tmp.c_str(), err);
 					}
 					break;

examples/common/font/font_manager.cpp

@@ -5,18 +5,19 @@
 
 #define USE_EDTAA3 0
 
-#include "bx/platform.h"
+#include <bx/macros.h>
 
 #if BX_COMPILER_MSVC
-#define generic GenericFromFreeType     // WinRT language extensions see "generic" as a keyword... this is stupid
-#define interface InterfaceFromFreeType
-#pragma warning(push)
-#pragma warning(disable : 4245)         // conversion from 'int' to 'FT_UInt', signed/unsigned mismatch
-#include <freetype/freetype.h>
-#pragma warning(pop)
-#else
+#	define generic GenericFromFreeType // WinRT language extensions see "generic" as a keyword... this is stupid
+#endif // BX_COMPILER_MSVC
+
+BX_PRAGMA_DIAGNOSTIC_PUSH();
+BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4245) // error C4245: '=' : conversion from 'int' to 'FT_UInt', signed/unsigned mismatch
+#pragma push_macro("interface")
+#undef interface
 #include <freetype/freetype.h>
-#endif
+#pragma pop_macro("interface")
+BX_PRAGMA_DIAGNOSTIC_POP();
 
 #include "../common.h"
 

examples/common/imgui/imgui.cpp

@@ -77,7 +77,7 @@ static void imguiFree(void* _ptr, void* /*_userptr*/)
 #define STBTT_malloc(_x, _y) imguiMalloc(_x, _y)
 #define STBTT_free(_x, _y) imguiFree(_x, _y)
 #define STB_TRUETYPE_IMPLEMENTATION
-#include <stb_truetype/stb_truetype.h>
+#include <stb/stb_truetype.h>
 
 namespace
 {
@@ -441,7 +441,7 @@ struct Imgui
 
 	ImguiFontHandle create(const void* _data, float _fontSize)
 	{
-		m_nvg = nvgCreate(512, 512, 1, m_view);
+		m_nvg = nvgCreate(1, m_view);
 		nvgCreateFontMem(m_nvg, "default", (unsigned char*)_data, INT32_MAX, 0);
 		nvgFontSize(m_nvg, _fontSize);
 		nvgFontFace(m_nvg, "default");
@@ -768,7 +768,7 @@ struct Imgui
 
 	void beginFrame(int32_t _mx, int32_t _my, uint8_t _button, int32_t _scroll, uint16_t _width, uint16_t _height, char _inputChar, uint8_t _view)
 	{
-		nvgBeginFrame(m_nvg, _width, _height, 1.0f, NVG_STRAIGHT_ALPHA);
+		nvgBeginFrame(m_nvg, _width, _height, 1.0f);
 
 		m_view = _view;
 		m_viewWidth = _width;

examples/common/nanovg/nanovg.h

@@ -25,7 +25,12 @@ extern "C" {
 
 #define NVG_PI 3.14159265358979323846264338327f
 
-struct NVGcontext;
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4201)  // nonstandard extension used : nameless struct/union
+#endif
+
+typedef struct NVGcontext NVGcontext;
 
 struct NVGcolor {
 	union {
@@ -35,17 +40,18 @@ struct NVGcolor {
 		};
 	};
 };
+typedef struct NVGcolor NVGcolor;
 
 struct NVGpaint {
 	float xform[6];
 	float extent[2];
 	float radius;
 	float feather;
-	struct NVGcolor innerColor;
-	struct NVGcolor outerColor;
+	NVGcolor innerColor;
+	NVGcolor outerColor;
 	int image;
-	int repeat;
 };
+typedef struct NVGpaint NVGpaint;
 
 enum NVGwinding {
 	NVG_CCW = 1,			// Winding for solid shapes
@@ -65,11 +71,6 @@ enum NVGlineCap {
 	NVG_MITER,
 };
 
-enum NVGpatternRepeat {
-	NVG_REPEATX = 0x01,		// Repeat image pattern in X direction
-	NVG_REPEATY = 0x02,		// Repeat image pattern in Y direction
-};
-
 enum NVGalign {
 	// Horizontal align
 	NVG_ALIGN_LEFT 		= 1<<0,	// Default, align text horizontally to left.
@@ -82,15 +83,12 @@ enum NVGalign {
 	NVG_ALIGN_BASELINE	= 1<<6, // Default, align text vertically to baseline. 
 };
 
-enum NVGalpha {
-	NVG_STRAIGHT_ALPHA,
-	NVG_PREMULTIPLIED_ALPHA,
-};
-
 struct NVGglyphPosition {
 	const char* str;	// Position of the glyph in the input string.
-	float x;			// The x- coordinate of the position of the glyph .
+	float x;			// The x-coordinate of the logical glyph position.
+	float minx, maxx;	// The bounds of the glyph shape.
 };
+typedef struct NVGglyphPosition NVGglyphPosition;
 
 struct NVGtextRow {
 	const char* start;	// Pointer to the input text where the row starts.
@@ -99,7 +97,15 @@ struct NVGtextRow {
 	float width;		// Logical width of the row.
 	float minx, maxx;	// Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending.
 };
-
+typedef struct NVGtextRow NVGtextRow;
+
+enum NVGimageFlags {
+    NVG_IMAGE_GENERATE_MIPMAPS	= 1<<0,     // Generate mipmaps during creation of the image.
+	NVG_IMAGE_REPEATX			= 1<<1,		// Repeat image in X direction.
+	NVG_IMAGE_REPEATY			= 1<<2,		// Repeat image in Y direction.
+	NVG_IMAGE_FLIPY				= 1<<3,		// Flips (inverses) image in Y direction when rendered.
+	NVG_IMAGE_PREMULTIPLIED		= 1<<4,		// Image data has premultiplied alpha.
+};
 
 // Begin drawing a new frame
 // Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame()
@@ -109,14 +115,13 @@ struct NVGtextRow {
 // For example, GLFW returns two dimension for an opened window: window size and
 // frame buffer size. In that case you would set windowWidth/Height to the window size
 // devicePixelRatio to: frameBufferWidth / windowWidth.
-// AlphaBlend controls if drawing the shapes to the render target should be done using straight or
-// premultiplied alpha. If rendering directly to framebuffer you probably want to use NVG_STRAIGHT_ALPHA,
-// if rendering to texture which should contain transparent regions NVG_PREMULTIPLIED_ALPHA is the
-// right choice.
-void nvgBeginFrame(struct NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio, int alphaBlend);
+void nvgBeginFrame(NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio);
+
+// Cancels drawing the current frame.
+void nvgCancelFrame(NVGcontext* ctx);
 
 // Ends drawing flushing remaining render state.
-void nvgEndFrame(struct NVGcontext* ctx);
+void nvgEndFrame(NVGcontext* ctx);
 
 //
 // Color utils
@@ -124,38 +129,35 @@ void nvgEndFrame(struct NVGcontext* ctx);
 // Colors in NanoVG are stored as unsigned ints in ABGR format.
 
 // Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f).
-struct NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b);
+NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b);
 
 // Returns a color value from red, green, blue values. Alpha will be set to 1.0f.
-struct NVGcolor nvgRGBf(float r, float g, float b);
+NVGcolor nvgRGBf(float r, float g, float b);
 
 
 // Returns a color value from red, green, blue and alpha values.
-struct NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
-
-//
-struct NVGcolor nvgRGBAu(unsigned int abgr);
+NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
 
 // Returns a color value from red, green, blue and alpha values.
-struct NVGcolor nvgRGBAf(float r, float g, float b, float a);
+NVGcolor nvgRGBAf(float r, float g, float b, float a);
 
 
 // Linearly interpoaltes from color c0 to c1, and returns resulting color value.
-struct NVGcolor nvgLerpRGBA(struct NVGcolor c0, struct NVGcolor c1, float u);
+NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u);
 
 // Sets transparency of a color value.
-struct NVGcolor nvgTransRGBA(struct NVGcolor c0, unsigned char a);
+NVGcolor nvgTransRGBA(NVGcolor c0, unsigned char a);
 
 // Sets transparency of a color value.
-struct NVGcolor nvgTransRGBAf(struct NVGcolor c0, float a);
+NVGcolor nvgTransRGBAf(NVGcolor c0, float a);
 
 // Returns color value specified by hue, saturation and lightness.
 // HSL values are all in range [0..1], alpha will be set to 255.
-struct NVGcolor nvgHSL(float h, float s, float l);
+NVGcolor nvgHSL(float h, float s, float l);
 
 // Returns color value specified by hue, saturation and lightness and alpha.
 // HSL values are all in range [0..1], alpha in range [0..255]
-struct NVGcolor nvgHSLA(float h, float s, float l, unsigned char a);
+NVGcolor nvgHSLA(float h, float s, float l, unsigned char a);
 
 //
 // State Handling
@@ -166,13 +168,13 @@ struct NVGcolor nvgHSLA(float h, float s, float l, unsigned char a);
 
 // Pushes and saves the current render state into a state stack.
 // A matching nvgRestore() must be used to restore the state.
-void nvgSave(struct NVGcontext* ctx);
+void nvgSave(NVGcontext* ctx);
 
 // Pops and restores current render state.
-void nvgRestore(struct NVGcontext* ctx);
+void nvgRestore(NVGcontext* ctx);
 
 // Resets current render state to default values. Does not affect the render state stack.
-void nvgReset(struct NVGcontext* ctx);
+void nvgReset(NVGcontext* ctx);
 
 //
 // Render styles
@@ -184,31 +186,35 @@ void nvgReset(struct NVGcontext* ctx);
 // Current render style can be saved and restored using nvgSave() and nvgRestore(). 
 
 // Sets current stroke style to a solid color.
-void nvgStrokeColor(struct NVGcontext* ctx, struct NVGcolor color);
+void nvgStrokeColor(NVGcontext* ctx, NVGcolor color);
 
 // Sets current stroke style to a paint, which can be a one of the gradients or a pattern.
-void nvgStrokePaint(struct NVGcontext* ctx, struct NVGpaint paint);
+void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint);
 
 // Sets current fill cstyle to a solid color.
-void nvgFillColor(struct NVGcontext* ctx, struct NVGcolor color);
+void nvgFillColor(NVGcontext* ctx, NVGcolor color);
 
 // Sets current fill style to a paint, which can be a one of the gradients or a pattern.
-void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint);
+void nvgFillPaint(NVGcontext* ctx, NVGpaint paint);
 
 // Sets the miter limit of the stroke style.
 // Miter limit controls when a sharp corner is beveled.
-void nvgMiterLimit(struct NVGcontext* ctx, float limit);
+void nvgMiterLimit(NVGcontext* ctx, float limit);
 
 // Sets the stroke witdth of the stroke style.
-void nvgStrokeWidth(struct NVGcontext* ctx, float size);
+void nvgStrokeWidth(NVGcontext* ctx, float size);
 
 // Sets how the end of the line (cap) is drawn,
 // Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE.
-void nvgLineCap(struct NVGcontext* ctx, int cap);
+void nvgLineCap(NVGcontext* ctx, int cap);
 
 // Sets how sharp path corners are drawn.
 // Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL.
-void nvgLineJoin(struct NVGcontext* ctx, int join);
+void nvgLineJoin(NVGcontext* ctx, int join);
+
+// Sets the transparency applied to all rendered shapes.
+// Alreade transparent paths will get proportionally more transparent as well.
+void nvgGlobalAlpha(NVGcontext* ctx, float alpha);
 
 //
 // Transforms
@@ -228,50 +234,103 @@ void nvgLineJoin(struct NVGcontext* ctx, int join);
 // Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore(). 
 
 // Resets current transform to a identity matrix.
-void nvgResetTransform(struct NVGcontext* ctx);
+void nvgResetTransform(NVGcontext* ctx);
 
 // Premultiplies current coordinate system by specified matrix.
 // The parameters are interpreted as matrix as follows:
 //   [a c e]
 //   [b d f]
 //   [0 0 1]
-void nvgTransform(struct NVGcontext* ctx, float a, float b, float c, float d, float e, float f);
+void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f);
 
 // Translates current coordinate system.
-void nvgTranslate(struct NVGcontext* ctx, float x, float y);
+void nvgTranslate(NVGcontext* ctx, float x, float y);
+
+// Rotates current coordinate system. Angle is specifid in radians.
+void nvgRotate(NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along X axis. Angle is specifid in radians.
+void nvgSkewX(NVGcontext* ctx, float angle);
 
-// Rotates current coordinate system.
-void nvgRotate(struct NVGcontext* ctx, float angle);
+// Skews the current coordinate system along Y axis. Angle is specifid in radians.
+void nvgSkewY(NVGcontext* ctx, float angle);
 
 // Scales the current coordinat system.
-void nvgScale(struct NVGcontext* ctx, float x, float y);
+void nvgScale(NVGcontext* ctx, float x, float y);
+
+// Stores the top part (a-f) of the current transformation matrix in to the specified buffer.
+//   [a c e]
+//   [b d f]
+//   [0 0 1]
+// There should be space for 6 floats in the return buffer for the values a-f.
+void nvgCurrentTransform(NVGcontext* ctx, float* xform);
+
+
+// The following functions can be used to make calculations on 2x3 transformation matrices.
+// A 2x3 matrix is representated as float[6].
+
+// Sets the transform to identity matrix.
+void nvgTransformIdentity(float* dst);
+
+// Sets the transform to translation matrix matrix.
+void nvgTransformTranslate(float* dst, float tx, float ty);
+
+// Sets the transform to scale matrix.
+void nvgTransformScale(float* dst, float sx, float sy);
+
+// Sets the transform to rotate matrix. Angle is specifid in radians.
+void nvgTransformRotate(float* dst, float a);
+
+// Sets the transform to skew-x matrix. Angle is specifid in radians.
+void nvgTransformSkewX(float* dst, float a);
+
+// Sets the transform to skew-y matrix. Angle is specifid in radians.
+void nvgTransformSkewY(float* dst, float a);
+
+// Sets the transform to the result of multiplication of two transforms, of A = A*B.
+void nvgTransformMultiply(float* dst, const float* src);
+
+// Sets the transform to the result of multiplication of two transforms, of A = B*A.
+void nvgTransformPremultiply(float* dst, const float* src);
+
+// Sets the destination to inverse of specified transform.
+// Returns 1 if the inverse could be calculated, else 0.
+int nvgTransformInverse(float* dst, const float* src);
+
+// Transform a point by given transform.
+void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy);
+
+// Converts degress to radians and vice versa.
+float nvgDegToRad(float deg);
+float nvgRadToDeg(float rad);
 
 //
 // Images
 //
 // NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering.
 // In addition you can upload your own image. The image loading is provided by stb_image.
+// The parameter imageFlags is combination of flags defined in NVGimageFlags.
 
 // Creates image by loading it from the disk from specified file name.
 // Returns handle to the image.
-int nvgCreateImage(struct NVGcontext* ctx, const char* filename);
+int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags);
 
 // Creates image by loading it from the specified chunk of memory.
 // Returns handle to the image.
-int nvgCreateImageMem(struct NVGcontext* ctx, unsigned char* data, int ndata);
+int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata);
 
 // Creates image from specified image data.
 // Returns handle to the image.
-int nvgCreateImageRGBA(struct NVGcontext* ctx, int w, int h, const unsigned char* data);
+int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data);
 
 // Updates image data specified by image handle.
-void nvgUpdateImage(struct NVGcontext* ctx, int image, const unsigned char* data);
+void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data);
 
 // Returns the domensions of a created image.
-void nvgImageSize(struct NVGcontext* ctx, int image, int* w, int* h);
+void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h);
 
 // Deletes created image.
-void nvgDeleteImage(struct NVGcontext* ctx, int image);
+void nvgDeleteImage(NVGcontext* ctx, int image);
 
 //
 // Paints
@@ -282,29 +341,28 @@ void nvgDeleteImage(struct NVGcontext* ctx, int image);
 // Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates
 // of the linear gradient, icol specifies the start color and ocol the end color.
 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
-struct NVGpaint nvgLinearGradient(struct NVGcontext* ctx, float sx, float sy, float ex, float ey,
-								  struct NVGcolor icol, struct NVGcolor ocol);
+NVGpaint nvgLinearGradient(NVGcontext* ctx, float sx, float sy, float ex, float ey,
+						   NVGcolor icol, NVGcolor ocol);
 
 // Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering
 // drop shadows or hilights for boxes. Parameters (x,y) define the top-left corner of the rectangle,
 // (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry
 // the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient.
 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
-struct NVGpaint nvgBoxGradient(struct NVGcontext* ctx, float x, float y, float w, float h,
-							   float r, float f, struct NVGcolor icol, struct NVGcolor ocol);
+NVGpaint nvgBoxGradient(NVGcontext* ctx, float x, float y, float w, float h,
+						float r, float f, NVGcolor icol, NVGcolor ocol);
 
 // Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify
 // the inner and outer radius of the gradient, icol specifies the start color and ocol the end color.
 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
-struct NVGpaint nvgRadialGradient(struct NVGcontext* ctx, float cx, float cy, float inr, float outr,
-								  struct NVGcolor icol, struct NVGcolor ocol);
+NVGpaint nvgRadialGradient(NVGcontext* ctx, float cx, float cy, float inr, float outr,
+						   NVGcolor icol, NVGcolor ocol);
 
 // Creates and returns an image patter. Parameters (ox,oy) specify the left-top location of the image pattern,
-// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render,
-// and repeat is combination of NVG_REPEATX and NVG_REPEATY which tells if the image should be repeated across x or y.
+// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render.
 // The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
-struct NVGpaint nvgImagePattern(struct NVGcontext* ctx, float ox, float oy, float ex, float ey,
-								float angle, int image, int repeat);
+NVGpaint nvgImagePattern(NVGcontext* ctx, float ox, float oy, float ex, float ey,
+						 float angle, int image, float alpha);
 
 //
 // Scissoring
@@ -312,12 +370,20 @@ struct NVGpaint nvgImagePattern(struct NVGcontext* ctx, float ox, float oy, floa
 // Scissoring allows you to clip the rendering into a rectangle. This is useful for varius
 // user interface cases like rendering a text edit or a timeline. 
 
-// Sets the current 
+// Sets the current scissor rectangle.
 // The scissor rectangle is transformed by the current transform.
-void nvgScissor(struct NVGcontext* ctx, float x, float y, float w, float h);
+void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Intersects current scissor rectangle with the specified rectangle.
+// The scissor rectangle is transformed by the current transform.
+// Note: in case the rotation of previous scissor rect differs from
+// the current one, the intersection will be done between the specified
+// rectangle and the previous scissor rectangle transformed in the current
+// transform space. The resulting shape is always rectangle.
+void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h);
 
 // Reset and disables scissoring.
-void nvgResetScissor(struct NVGcontext* ctx);
+void nvgResetScissor(NVGcontext* ctx);
 
 //
 // Paths
@@ -337,46 +403,51 @@ void nvgResetScissor(struct NVGcontext* ctx);
 // The curve segments and sub-paths are transformed by the current transform.
 
 // Clears the current path and sub-paths.
-void nvgBeginPath(struct NVGcontext* ctx);
+void nvgBeginPath(NVGcontext* ctx);
 
 // Starts new sub-path with specified point as first point.
-void nvgMoveTo(struct NVGcontext* ctx, float x, float y);
+void nvgMoveTo(NVGcontext* ctx, float x, float y);
 
 // Adds line segment from the last point in the path to the specified point.
-void nvgLineTo(struct NVGcontext* ctx, float x, float y);
+void nvgLineTo(NVGcontext* ctx, float x, float y);
+
+// Adds cubic bezier segment from last point in the path via two control points to the specified point.
+void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y);
 
-// Adds bezier segment from last point in the path via two control points to the specified point.
-void nvgBezierTo(struct NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y);
+// Adds quadratic bezier segment from last point in the path via a control point to the specified point.
+void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y);
 
 // Adds an arc segment at the corner defined by the last path point, and two specified points.
-void nvgArcTo(struct NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius);
+void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius);
 
 // Closes current sub-path with a line segment.
-void nvgClosePath(struct NVGcontext* ctx);
+void nvgClosePath(NVGcontext* ctx);
 
 // Sets the current sub-path winding, see NVGwinding and NVGsolidity. 
-void nvgPathWinding(struct NVGcontext* ctx, int dir);
+void nvgPathWinding(NVGcontext* ctx, int dir);
 
-// Creates new arc shaped sub-path.
-void nvgArc(struct NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir);
+// Creates new circle arc shaped sub-path. The arc center is at cx,cy, the arc radius is r,
+// and the arc is drawn from angle a0 to a1, and swept in direction dir (NVG_CCW, or NVG_CW).
+// Angles are specified in radians.
+void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir);
 
 // Creates new rectangle shaped sub-path.
-void nvgRect(struct NVGcontext* ctx, float x, float y, float w, float h);
+void nvgRect(NVGcontext* ctx, float x, float y, float w, float h);
 
 // Creates new rounded rectangle shaped sub-path.
-void nvgRoundedRect(struct NVGcontext* ctx, float x, float y, float w, float h, float r);
+void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r);
 
 // Creates new ellipse shaped sub-path.
-void nvgEllipse(struct NVGcontext* ctx, float cx, float cy, float rx, float ry);
+void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry);
 
 // Creates new circle shaped sub-path. 
-void nvgCircle(struct NVGcontext* ctx, float cx, float cy, float r);
+void nvgCircle(NVGcontext* ctx, float cx, float cy, float r);
 
 // Fills the current path with current fill style.
-void nvgFill(struct NVGcontext* ctx);
+void nvgFill(NVGcontext* ctx);
 
 // Fills the current path with current stroke style.
-void nvgStroke(struct NVGcontext* ctx);
+void nvgStroke(NVGcontext* ctx);
 
 
 //
@@ -414,67 +485,67 @@ void nvgStroke(struct NVGcontext* ctx);
 
 // Creates font by loading it from the disk from specified file name.
 // Returns handle to the font.
-int nvgCreateFont(struct NVGcontext* ctx, const char* name, const char* filename);
+int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename);
 
 // Creates image by loading it from the specified memory chunk.
 // Returns handle to the font.
-int nvgCreateFontMem(struct NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData);
+int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData);
 
 // Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found.
-int nvgFindFont(struct NVGcontext* ctx, const char* name);
+int nvgFindFont(NVGcontext* ctx, const char* name);
 
 // Sets the font size of current text style.
-void nvgFontSize(struct NVGcontext* ctx, float size);
+void nvgFontSize(NVGcontext* ctx, float size);
 
 // Sets the blur of current text style.
-void nvgFontBlur(struct NVGcontext* ctx, float blur);
+void nvgFontBlur(NVGcontext* ctx, float blur);
 
 // Sets the letter spacing of current text style.
-void nvgTextLetterSpacing(struct NVGcontext* ctx, float spacing);
+void nvgTextLetterSpacing(NVGcontext* ctx, float spacing);
 
 // Sets the proportional line height of current text style. The line height is specified as multiple of font size. 
-void nvgTextLineHeight(struct NVGcontext* ctx, float lineHeight);
+void nvgTextLineHeight(NVGcontext* ctx, float lineHeight);
 
 // Sets the text align of current text style, see NVGaling for options.
-void nvgTextAlign(struct NVGcontext* ctx, int align);
+void nvgTextAlign(NVGcontext* ctx, int align);
 
 // Sets the font face based on specified id of current text style.
-void nvgFontFaceId(struct NVGcontext* ctx, int font);
+void nvgFontFaceId(NVGcontext* ctx, int font);
 
 // Sets the font face based on specified name of current text style.
-void nvgFontFace(struct NVGcontext* ctx, const char* font);
+void nvgFontFace(NVGcontext* ctx, const char* font);
 
 // Draws text string at specified location. If end is specified only the sub-string up to the end is drawn.
-float nvgText(struct NVGcontext* ctx, float x, float y, const char* string, const char* end);
+float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end);
 
 // Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn.
 // White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
 // Words longer than the max width are slit at nearest character (i.e. no hyphenation).
-void nvgTextBox(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end);
+void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end);
 
 // Measures the specified text string. Parameter bounds should be a pointer to float[4],
 // if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
 // Returns the horizontal advance of the measured text (i.e. where the next character should drawn).
 // Measured values are returned in local coordinate space.
-float nvgTextBounds(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds);
+float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds);
 
 // Measures the specified multi-text string. Parameter bounds should be a pointer to float[4],
 // if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
 // Measured values are returned in local coordinate space.
-void nvgTextBoxBounds(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds);
+void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds);
 
 // Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used.
 // Measured values are returned in local coordinate space.
-int nvgTextGlyphPositions(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, struct NVGglyphPosition* positions, int maxPositions);
+int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions);
 
 // Returns the vertical metrics based on the current text style.
 // Measured values are returned in local coordinate space.
-void nvgTextMetrics(struct NVGcontext* ctx, float* ascender, float* descender, float* lineh);
+void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh);
 
 // Breaks the specified text into lines. If end is specified only the sub-string will be used.
 // White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
 // Words longer than the max width are slit at nearest character (i.e. no hyphenation).
-int nvgTextBreakLines(struct NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, struct NVGtextRow* rows, int maxRows);
+int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows);
 
 //
 // Internal Render API
@@ -484,60 +555,66 @@ enum NVGtexture {
 	NVG_TEXTURE_RGBA = 0x02,
 };
 
-struct NVGscissor
-{
+struct NVGscissor {
 	float xform[6];
 	float extent[2];
 };
+typedef struct NVGscissor NVGscissor;
 
 struct NVGvertex {
 	float x,y,u,v;
 };
+typedef struct NVGvertex NVGvertex;
 
 struct NVGpath {
 	int first;
 	int count;
 	unsigned char closed;
 	int nbevel;
-	struct NVGvertex* fill;
+	NVGvertex* fill;
 	int nfill;
-	struct NVGvertex* stroke;
+	NVGvertex* stroke;
 	int nstroke;
 	int winding;
 	int convex;
 };
+typedef struct NVGpath NVGpath;
 
 struct NVGparams {
 	void* userPtr;
-	int atlasWidth, atlasHeight;
 	int edgeAntiAlias;
 	int (*renderCreate)(void* uptr);
-	int (*renderCreateTexture)(void* uptr, int type, int w, int h, const unsigned char* data);
+	int (*renderCreateTexture)(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data);
 	int (*renderDeleteTexture)(void* uptr, int image);
 	int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data);
 	int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h);
-	void (*renderViewport)(void* uptr, int width, int height, int alphaBlend);
-	void (*renderFlush)(void* uptr, int alphaBlend);
-	void (*renderFill)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe, const float* bounds, const struct NVGpath* paths, int npaths);
-	void (*renderStroke)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe, float strokeWidth, const struct NVGpath* paths, int npaths);
-	void (*renderTriangles)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, const struct NVGvertex* verts, int nverts);
+	void (*renderViewport)(void* uptr, int width, int height);
+	void (*renderCancel)(void* uptr);
+	void (*renderFlush)(void* uptr);
+	void (*renderFill)(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths, int npaths);
+	void (*renderStroke)(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths, int npaths);
+	void (*renderTriangles)(void* uptr, NVGpaint* paint, NVGscissor* scissor, const NVGvertex* verts, int nverts);
 	void (*renderDelete)(void* uptr);
 };
+typedef struct NVGparams NVGparams;
+
+NVGcontext* nvgCreate(int edgeaa, unsigned char viewid);
+void nvgDelete(struct NVGcontext* ctx);
 
 // Contructor and destructor, called by the render back-end.
-struct NVGcontext* nvgCreateInternal(struct NVGparams* params);
-void nvgDeleteInternal(struct NVGcontext* ctx);
+NVGcontext* nvgCreateInternal(NVGparams* params);
+void nvgDeleteInternal(NVGcontext* ctx);
 
-// Debug function to dump cached path data.
-void nvgDebugDumpPathCache(struct NVGcontext* ctx);
+NVGparams* nvgInternalParams(NVGcontext* ctx);
 
-//
-struct NVGcontext* nvgCreate(int atlasw, int atlash, int edgeaa, unsigned char viewid);
+// Debug function to dump cached path data.
+void nvgDebugDumpPathCache(NVGcontext* ctx);
 
-//
-void nvgDelete(struct NVGcontext* ctx);
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
 
-#define NVG_NOTUSED(v) for (;;) { (void)(true ? (void)0 : ( (void)(v) ) ); break; }
+#define NVG_NOTUSED(v) for (;;) { (void)(1 ? (void)0 : ( (void)(v) ) ); break; }
 
 #ifdef __cplusplus
 }

examples/common/nanovg/nanovg_bgfx.cpp

@@ -45,11 +45,17 @@ namespace
 		NSVG_SHADER_IMG
 	};
 
+	// These are additional flags on top of NVGimageFlags.
+	enum NVGimageFlagsGL {
+		NVG_IMAGE_NODELETE = 1<<16, // Do not delete GL texture handle.
+	};
+
 	struct GLNVGtexture
 	{
 		bgfx::TextureHandle id;
 		int width, height;
 		int type;
+		int flags;
 	};
 
 	enum GLNVGcallType
@@ -198,20 +204,21 @@ namespace
 
 	static int glnvg__deleteTexture(struct GLNVGcontext* gl, int id)
 	{
-		int i;
-		for (i = 0; i < gl->ntextures; i++)
+		for (int ii = 0; ii < gl->ntextures; ii++)
 		{
-			if (gl->textures[i].id.idx == id)
+			if (gl->textures[ii].id.idx == id)
 			{
-				if (bgfx::isValid(gl->textures[i].id) )
+				if (bgfx::isValid(gl->textures[ii].id)
+				&& (gl->textures[ii].flags & NVG_IMAGE_NODELETE) == 0)
 				{
-					bgfx::destroyTexture(gl->textures[i].id);
+					bgfx::destroyTexture(gl->textures[ii].id);
 				}
-				memset(&gl->textures[i], 0, sizeof(gl->textures[i]));
-				gl->textures[i].id.idx = bgfx::invalidHandle;
+				memset(&gl->textures[ii], 0, sizeof(gl->textures[ii]));
+				gl->textures[ii].id.idx = bgfx::invalidHandle;
 				return 1;
 			}
 		}
+
 		return 0;
 	}
 
@@ -277,7 +284,7 @@ namespace
 		return 1;
 	}
 
-	static int nvgRenderCreateTexture(void* _userPtr, int _type, int _width, int _height, const unsigned char* _rgba)
+	static int nvgRenderCreateTexture(void* _userPtr, int _type, int _width, int _height, int _flags, const unsigned char* _rgba)
 	{
 		struct GLNVGcontext* gl = (struct GLNVGcontext*)_userPtr;
 		struct GLNVGtexture* tex = glnvg__allocTexture(gl);
@@ -290,6 +297,7 @@ namespace
 		tex->width  = _width;
 		tex->height = _height;
 		tex->type   = _type;
+		tex->flags  = _flags;
 
 		uint32_t bytesPerPixel = NVG_TEXTURE_RGBA == tex->type ? 4 : 1;
 		uint32_t pitch = tex->width * bytesPerPixel;
@@ -505,10 +513,9 @@ namespace
 		gl->th = handle;
 	}
 
-	static void nvgRenderViewport(void* _userPtr, int width, int height, int alphaBlend)
+	static void nvgRenderViewport(void* _userPtr, int width, int height)
 	{
 		struct GLNVGcontext* gl = (struct GLNVGcontext*)_userPtr;
-		NVG_NOTUSED(alphaBlend);
 		gl->view[0] = (float)width;
 		gl->view[1] = (float)height;
 		bgfx::setViewRect(gl->viewid, 0, 0, width, height);
@@ -672,7 +679,7 @@ namespace
 		}
 	}
 
-	static void nvgRenderFlush(void* _userPtr, int alphaBlend)
+	static void nvgRenderFlush(void* _userPtr)
 	{
 		struct GLNVGcontext* gl = (struct GLNVGcontext*)_userPtr;
 
@@ -687,14 +694,14 @@ namespace
 				| BGFX_STATE_ALPHA_WRITE
 				;
 
-			if (alphaBlend == NVG_PREMULTIPLIED_ALPHA)
-			{
-				gl->state |= BGFX_STATE_BLEND_FUNC_SEPARATE(
-								  BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA
-								, BGFX_STATE_BLEND_ONE,       BGFX_STATE_BLEND_INV_SRC_ALPHA
-								);
-			}
-			else
+// 			if (alphaBlend == NVG_PREMULTIPLIED_ALPHA)
+// 			{
+// 				gl->state |= BGFX_STATE_BLEND_FUNC_SEPARATE(
+// 								  BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA
+// 								, BGFX_STATE_BLEND_ONE,       BGFX_STATE_BLEND_INV_SRC_ALPHA
+// 								);
+// 			}
+// 			else
 			{
 				gl->state |= BGFX_STATE_BLEND_FUNC(
 								BGFX_STATE_BLEND_SRC_ALPHA, BGFX_STATE_BLEND_INV_SRC_ALPHA
@@ -977,7 +984,8 @@ namespace
 
 		for (uint32_t ii = 0, num = gl->ntextures; ii < num; ++ii)
 		{
-			if (bgfx::isValid(gl->textures[ii].id) )
+			if (bgfx::isValid(gl->textures[ii].id)
+			&& (gl->textures[ii].flags & NVG_IMAGE_NODELETE) == 0) 
 			{
 				bgfx::destroyTexture(gl->textures[ii].id);
 			}
@@ -990,7 +998,7 @@ namespace
 
 } // namespace
 
-struct NVGcontext* nvgCreate(int atlasw, int atlash, int edgeaa, unsigned char viewid)
+NVGcontext* nvgCreate(int edgeaa, unsigned char viewid)
 {
 	struct NVGparams params;
 	struct NVGcontext* ctx = NULL;
@@ -1011,8 +1019,6 @@ struct NVGcontext* nvgCreate(int atlasw, int atlash, int edgeaa, unsigned char v
 	params.renderTriangles      = nvgRenderTriangles;
 	params.renderDelete         = nvgRenderDelete;
 	params.userPtr = gl;
-	params.atlasWidth = atlasw;
-	params.atlasHeight = atlash;
 	params.edgeAntiAlias = edgeaa;
 
 	gl->edgeAntiAlias = edgeaa;