diff options
| author | Emmanuele Bassi <ebassi@linux.intel.com> | 2010-01-05 18:02:29 +0000 |
|---|---|---|
| committer | Emmanuele Bassi <ebassi@linux.intel.com> | 2010-01-11 14:55:01 +0000 |
| commit | a39c715a95cbdcb4a6749f169d79d7cff8051469 (patch) | |
| tree | 8a25934c636309a09a65fa8d7e1dd8e136745e8f | |
| parent | 43f7b43a1e5fbf5dfd03f0507fcb3c491f625c26 (diff) | |
| download | clutter-a39c715a95cbdcb4a6749f169d79d7cff8051469.tar.gz | |
Covert stb_image.c to Unix format
The file is still in DOS format (CRLF instead of LF) and this confuses
the hell out of some versions of Git.
(cherry picked from commit 8b59573190907da97c2af5a5be2e563fc66f8d51)
Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
| -rw-r--r-- | clutter/cogl/common/stb_image.c | 7544 |
1 files changed, 3772 insertions, 3772 deletions
diff --git a/clutter/cogl/common/stb_image.c b/clutter/cogl/common/stb_image.c index bd3e63b35..c6f8d730d 100644 --- a/clutter/cogl/common/stb_image.c +++ b/clutter/cogl/common/stb_image.c @@ -1,3772 +1,3772 @@ -/* stbi-1.12 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c
- when you control the images you're loading
-
- 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, no oddball channel decimations)
- PNG non-interlaced
- BMP non-1bpp, non-RLE
- TGA (not sure what subset, if a subset)
- PSD (composited view only, no extra channels)
- HDR (radiance rgbE format)
- writes BMP,TGA (define STBI_NO_WRITE to remove code)
- decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code)
- supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD)
-
- TODO:
- stbi_info_*
-
- history:
- 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
-*/
-
-
-//// begin header file ////////////////////////////////////////////////////
-//
-// Limitations:
-// - no progressive/interlaced support (jpeg, png)
-// - 8-bit samples only (jpeg, png)
-// - not threadsafe
-// - channel subsampling of at most 2 in each dimension (jpeg)
-// - no delayed line count (jpeg) -- IJG doesn't support either
-//
-// 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
-// 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 and BMP images are automatically depalettized.
-//
-//
-// ===========================================================================
-//
-// 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);
-
-
-#ifndef STBI_NO_STDIO
-#include <stdio.h>
-#endif
-
-#ifndef STBI_NO_HDR
-#include <math.h> // ldexp
-#include <string.h> // strcmp
-#endif
-
-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
-
-// WRITING API
-
-#if !defined(STBI_NO_WRITE) && !defined(STBI_NO_STDIO)
-// write a BMP/TGA file given tightly packed 'comp' channels (no padding, nor bmp-stride-padding)
-// (you must include the appropriate extension in the filename).
-// returns TRUE on success, FALSE if couldn't open file, error writing file
-extern int stbi_write_bmp (char const *filename, int x, int y, int comp, void *data);
-extern int stbi_write_tga (char const *filename, int x, int y, int comp, void *data);
-#endif
-
-// PRIMARY API - works on images of any type
-
-// load image by filename, open file, or memory buffer
-#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);
-extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
-#endif
-extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-// for stbi_load_from_file, file pointer is left pointing immediately after image
-
-#ifndef STBI_NO_HDR
-#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_memory(stbi_uc const *buffer, int len, 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
-
-// get a VERY brief reason for failure
-extern 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_is_hdr_from_memory(stbi_uc const *buffer, int len);
-#ifndef STBI_NO_STDIO
-extern int stbi_info (char const *filename, int *x, int *y, int *comp);
-extern int stbi_is_hdr (char const *filename);
-extern int stbi_is_hdr_from_file(FILE *f);
-#endif
-
-// ZLIB client - used by PNG, available for other purposes
-
-extern char *stbi_zlib_decode_malloc_guesssize(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);
-
-// TYPE-SPECIFIC ACCESS
-
-// is it a jpeg?
-extern int stbi_jpeg_test_memory (stbi_uc const *buffer, int len);
-extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
-
-#ifndef STBI_NO_STDIO
-extern stbi_uc *stbi_jpeg_load (char const *filename, int *x, int *y, int *comp, int req_comp);
-extern int stbi_jpeg_test_file (FILE *f);
-extern stbi_uc *stbi_jpeg_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
-
-extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp);
-extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp);
-#endif
-
-extern int stbi_jpeg_dc_only; // only decode DC component
-
-// is it a png?
-extern int stbi_png_test_memory (stbi_uc const *buffer, int len);
-extern stbi_uc *stbi_png_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp);
-
-#ifndef STBI_NO_STDIO
-extern stbi_uc *stbi_png_load (char const *filename, int *x, int *y, int *comp, int req_comp);
-extern int stbi_png_info (char const *filename, int *x, int *y, int *comp);
-extern int stbi_png_test_file (FILE *f);
-extern stbi_uc *stbi_png_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
-extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp);
-#endif
-
-// is it a bmp?
-extern int stbi_bmp_test_memory (stbi_uc const *buffer, int len);
-
-extern stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp);
-extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-#ifndef STBI_NO_STDIO
-extern int stbi_bmp_test_file (FILE *f);
-extern stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
-#endif
-
-// is it a tga?
-extern int stbi_tga_test_memory (stbi_uc const *buffer, int len);
-
-extern stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp);
-extern stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-#ifndef STBI_NO_STDIO
-extern int stbi_tga_test_file (FILE *f);
-extern stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
-#endif
-
-// is it a psd?
-extern int stbi_psd_test_memory (stbi_uc const *buffer, int len);
-
-extern stbi_uc *stbi_psd_load (char const *filename, int *x, int *y, int *comp, int req_comp);
-extern stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-#ifndef STBI_NO_STDIO
-extern int stbi_psd_test_file (FILE *f);
-extern stbi_uc *stbi_psd_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
-#endif
-
-// is it an hdr?
-extern int stbi_hdr_test_memory (stbi_uc const *buffer, int len);
-
-extern float * stbi_hdr_load (char const *filename, int *x, int *y, int *comp, int req_comp);
-extern float * stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
-#ifndef STBI_NO_STDIO
-extern int stbi_hdr_test_file (FILE *f);
-extern float * stbi_hdr_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
-#endif
-
-// define new loaders
-typedef struct
-{
- int (*test_memory)(stbi_uc const *buffer, int len);
- stbi_uc * (*load_from_memory)(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
- #ifndef STBI_NO_STDIO
- int (*test_file)(FILE *f);
- stbi_uc * (*load_from_file)(FILE *f, int *x, int *y, int *comp, int req_comp);
- #endif
-} stbi_loader;
-
-// register a loader by filling out the above structure (you must defined ALL functions)
-// returns 1 if added or already added, 0 if not added (too many loaders)
-extern int stbi_register_loader(stbi_loader *loader);
-
-// define faster low-level operations (typically SIMD support)
-#if STBI_SIMD
-typedef void (*stbi_idct_8x8)(uint8 *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)(uint8 *output, uint8 const *y, uint8 const *cb, uint8 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 /////////////////////////////////////////////////////
-
-#ifndef STBI_NO_STDIO
-#include <stdio.h>
-#endif
-#include <stdlib.h>
-#include <memory.h>
-#include <assert.h>
-#include <stdarg.h>
-
-#if STBI_SIMD
-#include <emmintrin.h>
-#endif
-
-#ifndef _MSC_VER
-#define __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];
-
-#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE)
-#define STBI_NO_WRITE
-#endif
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// Generic API that works on all image types
-//
-
-static char *failure_reason;
-
-char *stbi_failure_reason(void)
-{
- return failure_reason;
-}
-
-static int e(char *str)
-{
- failure_reason = str;
- return 0;
-}
-
-#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);
-}
-
-#define MAX_LOADERS 32
-stbi_loader *loaders[MAX_LOADERS];
-static int max_loaders = 0;
-
-int stbi_register_loader(stbi_loader *loader)
-{
- int i;
- for (i=0; i < MAX_LOADERS; ++i) {
- // already present?
- if (loaders[i] == loader)
- return 1;
- // end of the list?
- if (loaders[i] == NULL) {
- loaders[i] = loader;
- max_loaders = i+1;
- return 1;
- }
- }
- // no room for it
- return 0;
-}
-
-#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
-
-#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)
-{
- int i;
- if (stbi_jpeg_test_file(f))
- return stbi_jpeg_load_from_file(f,x,y,comp,req_comp);
- if (stbi_png_test_file(f))
- return stbi_png_load_from_file(f,x,y,comp,req_comp);
- if (stbi_bmp_test_file(f))
- return stbi_bmp_load_from_file(f,x,y,comp,req_comp);
- if (stbi_psd_test_file(f))
- return stbi_psd_load_from_file(f,x,y,comp,req_comp);
- #ifndef STBI_NO_HDR
- if (stbi_hdr_test_file(f)) {
- float *hdr = stbi_hdr_load_from_file(f, x,y,comp,req_comp);
- return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
- }
- #endif
- for (i=0; i < max_loaders; ++i)
- if (loaders[i]->test_file(f))
- return loaders[i]->load_from_file(f,x,y,comp,req_comp);
- // test tga last because it's a crappy test!
- if (stbi_tga_test_file(f))
- return stbi_tga_load_from_file(f,x,y,comp,req_comp);
- return epuc("unknown image type", "Image not of any known type, or corrupt");
-}
-#endif
-
-unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- int i;
- if (stbi_jpeg_test_memory(buffer,len))
- return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp);
- if (stbi_png_test_memory(buffer,len))
- return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp);
- if (stbi_bmp_test_memory(buffer,len))
- return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp);
- if (stbi_psd_test_memory(buffer,len))
- return stbi_psd_load_from_memory(buffer,len,x,y,comp,req_comp);
- #ifndef STBI_NO_HDR
- if (stbi_hdr_test_memory(buffer, len)) {
- float *hdr = stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp);
- return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
- }
- #endif
- for (i=0; i < max_loaders; ++i)
- if (loaders[i]->test_memory(buffer,len))
- return loaders[i]->load_from_memory(buffer,len,x,y,comp,req_comp);
- // test tga last because it's a crappy test!
- if (stbi_tga_test_memory(buffer,len))
- return stbi_tga_load_from_memory(buffer,len,x,y,comp,req_comp);
- return epuc("unknown image type", "Image not of any known type, or corrupt");
-}
-
-#ifndef STBI_NO_HDR
-
-#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)
-{
- unsigned char *data;
- #ifndef STBI_NO_HDR
- if (stbi_hdr_test_file(f))
- return stbi_hdr_load_from_file(f,x,y,comp,req_comp);
- #endif
- data = stbi_load_from_file(f, 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");
-}
-#endif
-
-float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- stbi_uc *data;
- #ifndef STBI_NO_HDR
- if (stbi_hdr_test_memory(buffer, len))
- return stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp);
- #endif
- data = stbi_load_from_memory(buffer, len, 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");
-}
-#endif
-
-// 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!
-
-extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
-{
- #ifndef STBI_NO_HDR
- return stbi_hdr_test_memory(buffer, len);
- #else
- 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
- return stbi_hdr_test_file(f);
- #else
- return 0;
- #endif
-}
-
-#endif
-
-// @TODO: get image dimensions & components without fully decoding
-#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
-extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
-
-#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
-//
-
-// image width, height, # components
-static uint32 img_x, img_y;
-static int img_n, img_out_n;
-
-enum
-{
- SCAN_load=0,
- SCAN_type,
- SCAN_header,
-};
-
-// An API for reading either from memory or file.
-#ifndef STBI_NO_STDIO
-static FILE *img_file;
-#endif
-static uint8 const *img_buffer, *img_buffer_end;
-
-#ifndef STBI_NO_STDIO
-static void start_file(FILE *f)
-{
- img_file = f;
-}
-#endif
-
-static void start_mem(uint8 const *buffer, int len)
-{
-#ifndef STBI_NO_STDIO
- img_file = NULL;
-#endif
- img_buffer = buffer;
- img_buffer_end = buffer+len;
-}
-
-static int get8(void)
-{
-#ifndef STBI_NO_STDIO
- if (img_file) {
- int c = fgetc(img_file);
- return c == EOF ? 0 : c;
- }
-#endif
- if (img_buffer < img_buffer_end)
- return *img_buffer++;
- return 0;
-}
-
-static int at_eof(void)
-{
-#ifndef STBI_NO_STDIO
- if (img_file)
- return feof(img_file);
-#endif
- return img_buffer >= img_buffer_end;
-}
-
-static uint8 get8u(void)
-{
- return (uint8) get8();
-}
-
-static void skip(int n)
-{
-#ifndef STBI_NO_STDIO
- if (img_file)
- fseek(img_file, n, SEEK_CUR);
- else
-#endif
- img_buffer += n;
-}
-
-static int get16(void)
-{
- int z = get8();
- return (z << 8) + get8();
-}
-
-static uint32 get32(void)
-{
- uint32 z = get16();
- return (z << 16) + get16();
-}
-
-static int get16le(void)
-{
- int z = get8();
- return z + (get8() << 8);
-}
-
-static uint32 get32le(void)
-{
- uint32 z = get16le();
- return z + (get16le() << 16);
-}
-
-static void getn(stbi_uc *buffer, int n)
-{
-#ifndef STBI_NO_STDIO
- if (img_file) {
- fread(buffer, 1, n, img_file);
- return;
- }
-#endif
- memcpy(buffer, img_buffer, n);
- img_buffer += n;
-}
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// 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 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 * img_x * img_y);
- if (good == NULL) {
- free(data);
- return epuc("outofmem", "Out of memory");
- }
-
- for (j=0; j < img_y; ++j) {
- unsigned char *src = data + j * img_x * img_n ;
- unsigned char *dest = good + j * img_x * req_comp;
-
- #define COMBO(a,b) ((a)*8+(b))
- #define CASE(a,b) case COMBO(a,b): for(i=0; i < img_x; ++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);
- img_out_n = req_comp;
- 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] = 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] = 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)
-
-int stbi_jpeg_dc_only;
-
-// 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;
-
-static huffman huff_dc[4]; // baseline is 2 tables, extended is 4
-static huffman huff_ac[4];
-static uint8 dequant[4][64];
-#if STBI_SIMD
-static __declspec(align(16)) unsigned short dequant2[4][64];
-#endif
-
-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;
-}
-
-// sizes for components, interleaved MCUs
-static int img_h_max, img_v_max;
-static int img_mcu_x, img_mcu_y;
-static int img_mcu_w, img_mcu_h;
-
-// definition of jpeg image component
-static 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];
-
-static uint32 code_buffer; // jpeg entropy-coded buffer
-static int code_bits; // number of valid bits
-static unsigned char marker; // marker seen while filling entropy buffer
-static int nomore; // flag if we saw a marker so must stop
-
-static void grow_buffer_unsafe(void)
-{
- do {
- int b = nomore ? 0 : get8();
- if (b == 0xff) {
- int c = get8();
- if (c != 0) {
- marker = (unsigned char) c;
- nomore = 1;
- return;
- }
- }
- code_buffer = (code_buffer << 8) | b;
- code_bits += 8;
- } while (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
-__forceinline static int decode(huffman *h)
-{
- unsigned int temp;
- int c,k;
-
- if (code_bits < 16) grow_buffer_unsafe();
-
- // look at the top FAST_BITS and determine what symbol ID it is,
- // if the code is <= FAST_BITS
- c = (code_buffer >> (code_bits - FAST_BITS)) & ((1 << FAST_BITS)-1);
- k = h->fast[c];
- if (k < 255) {
- if (h->size[k] > code_bits)
- return -1;
- code_bits -= h->size[k];
- 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.
- if (code_bits < 16)
- temp = (code_buffer << (16 - code_bits)) & 0xffff;
- else
- temp = (code_buffer >> (code_bits - 16)) & 0xffff;
- for (k=FAST_BITS+1 ; ; ++k)
- if (temp < h->maxcode[k])
- break;
- if (k == 17) {
- // error! code not found
- code_bits -= 16;
- return -1;
- }
-
- if (k > code_bits)
- return -1;
-
- // convert the huffman code to the symbol id
- c = ((code_buffer >> (code_bits - k)) & bmask[k]) + h->delta[k];
- assert((((code_buffer) >> (code_bits - h->size[c])) & bmask[h->size[c]]) == h->code[c]);
-
- // convert the id to a symbol
- code_bits -= k;
- return h->values[c];
-}
-
-// combined JPEG 'receive' and JPEG 'extend', since baseline
-// always extends everything it receives.
-__forceinline static int extend_receive(int n)
-{
- unsigned int m = 1 << (n-1);
- unsigned int k;
- if (code_bits < n) grow_buffer_unsafe();
- k = (code_buffer >> (code_bits - n)) & bmask[n];
- code_bits -= n;
- // 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(short data[64], huffman *hdc, huffman *hac, int b)
-{
- int diff,dc,k;
- int t = decode(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(t) : 0;
- dc = img_comp[b].dc_pred + diff;
- 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(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(s);
- }
- } while (k < 64);
- return 1;
-}
-
-// take a -128..127 value and clamp it and convert to 0..255
-__forceinline static uint8 clamp(int x)
-{
- x += 128;
- // 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;
-
-#if !STBI_SIMD
-// .344 seconds on 3*anemones.jpg
-static void idct_block(uint8 *out, int out_stride, short data[64], uint8 *dequantize)
-{
- int i,val[64],*v=val;
- uint8 *o,*dq = dequantize;
- short *d = data;
-
- if (stbi_jpeg_dc_only) {
- // ok, I don't really know why this is right, but it seems to be:
- int z = 128 + ((d[0] * dq[0]) >> 3);
- for (i=0; i < 8; ++i) {
- out[0] = out[1] = out[2] = out[3] = out[4] = out[5] = out[6] = out[7] = z;
- out += out_stride;
- }
- return;
- }
-
- // 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.
- x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536;
- 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);
- }
-}
-#else
-static void idct_block(uint8 *out, int out_stride, short data[64], unsigned short *dequantize)
-{
- int i,val[64],*v=val;
- uint8 *o;
- unsigned short *dq = dequantize;
- short *d = data;
-
- if (stbi_jpeg_dc_only) {
- // ok, I don't really know why this is right, but it seems to be:
- int z = 128 + ((d[0] * dq[0]) >> 3);
- for (i=0; i < 8; ++i) {
- out[0] = out[1] = out[2] = out[3] = out[4] = out[5] = out[6] = out[7] = z;
- out += out_stride;
- }
- return;
- }
-
- // 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.
- x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536;
- 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);
- }
-}
-static stbi_idct_8x8 stbi_idct_installed = idct_block;
-
-extern 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(void)
-{
- uint8 x;
- if (marker != MARKER_none) { x = marker; marker = MARKER_none; return x; }
- x = get8u();
- if (x != 0xff) return MARKER_none;
- while (x == 0xff)
- x = get8u();
- return x;
-}
-
-// in each scan, we'll have scan_n components, and the order
-// of the components is specified by order[]
-static int scan_n, order[4];
-static int restart_interval, todo;
-#define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
-
-// after a restart interval, reset the entropy decoder and
-// the dc prediction
-static void reset(void)
-{
- code_bits = 0;
- code_buffer = 0;
- nomore = 0;
- img_comp[0].dc_pred = img_comp[1].dc_pred = img_comp[2].dc_pred = 0;
- marker = MARKER_none;
- todo = restart_interval ? 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(void)
-{
- reset();
- if (scan_n == 1) {
- int i,j;
- #if STBI_SIMD
- __declspec(align(16))
- #endif
- short data[64];
- int n = 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 = (img_comp[n].x+7) >> 3;
- int h = (img_comp[n].y+7) >> 3;
- for (j=0; j < h; ++j) {
- for (i=0; i < w; ++i) {
- if (!decode_block(data, huff_dc+img_comp[n].hd, huff_ac+img_comp[n].ha, n)) return 0;
- #if STBI_SIMD
- stbi_idct_installed(img_comp[n].data+img_comp[n].w2*j*8+i*8, img_comp[n].w2, data, dequant2[img_comp[n].tq]);
- #else
- idct_block(img_comp[n].data+img_comp[n].w2*j*8+i*8, img_comp[n].w2, data, dequant[img_comp[n].tq]);
- #endif
- // every data block is an MCU, so countdown the restart interval
- if (--todo <= 0) {
- if (code_bits < 24) grow_buffer_unsafe();
- // if it's NOT a restart, then just bail, so we get corrupt data
- // rather than no data
- if (!RESTART(marker)) return 1;
- reset();
- }
- }
- }
- } else { // interleaved!
- int i,j,k,x,y;
- short data[64];
- for (j=0; j < img_mcu_y; ++j) {
- for (i=0; i < img_mcu_x; ++i) {
- // scan an interleaved mcu... process scan_n components in order
- for (k=0; k < scan_n; ++k) {
- int n = 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 < img_comp[n].v; ++y) {
- for (x=0; x < img_comp[n].h; ++x) {
- int x2 = (i*img_comp[n].h + x)*8;
- int y2 = (j*img_comp[n].v + y)*8;
- if (!decode_block(data, huff_dc+img_comp[n].hd, huff_ac+img_comp[n].ha, n)) return 0;
- #if STBI_SIMD
- stbi_idct_installed(img_comp[n].data+img_comp[n].w2*y2+x2, img_comp[n].w2, data, dequant2[img_comp[n].tq]);
- #else
- idct_block(img_comp[n].data+img_comp[n].w2*y2+x2, img_comp[n].w2, data, dequant[img_comp[n].tq]);
- #endif
- }
- }
- }
- // after all interleaved components, that's an interleaved MCU,
- // so now count down the restart interval
- if (--todo <= 0) {
- if (code_bits < 24) grow_buffer_unsafe();
- // if it's NOT a restart, then just bail, so we get corrupt data
- // rather than no data
- if (!RESTART(marker)) return 1;
- reset();
- }
- }
- }
- }
- return 1;
-}
-
-static int process_marker(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() != 4) return e("bad DRI len","Corrupt JPEG");
- restart_interval = get16();
- return 1;
-
- case 0xDB: // DQT - define quantization table
- L = get16()-2;
- while (L > 0) {
- int z = get8();
- int p = z >> 4;
- int t = z & 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)
- dequant[t][dezigzag[i]] = get8u();
- #if STBI_SIMD
- for (i=0; i < 64; ++i)
- dequant2[t][i] = dequant[t][i];
- #endif
- L -= 65;
- }
- return L==0;
-
- case 0xC4: // DHT - define huffman table
- L = get16()-2;
- while (L > 0) {
- uint8 *v;
- int sizes[16],i,m=0;
- int z = get8();
- int tc = z >> 4;
- int th = z & 15;
- if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG");
- for (i=0; i < 16; ++i) {
- sizes[i] = get8();
- m += sizes[i];
- }
- L -= 17;
- if (tc == 0) {
- if (!build_huffman(huff_dc+th, sizes)) return 0;
- v = huff_dc[th].values;
- } else {
- if (!build_huffman(huff_ac+th, sizes)) return 0;
- v = huff_ac[th].values;
- }
- for (i=0; i < m; ++i)
- v[i] = get8u();
- L -= m;
- }
- return L==0;
- }
- // check for comment block or APP blocks
- if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
- skip(get16()-2);
- return 1;
- }
- return 0;
-}
-
-// after we see SOS
-static int process_scan_header(void)
-{
- int i;
- int Ls = get16();
- scan_n = get8();
- if (scan_n < 1 || scan_n > 4 || scan_n > (int) img_n) return e("bad SOS component count","Corrupt JPEG");
- if (Ls != 6+2*scan_n) return e("bad SOS len","Corrupt JPEG");
- for (i=0; i < scan_n; ++i) {
- int id = get8(), which;
- int z = get8();
- for (which = 0; which < img_n; ++which)
- if (img_comp[which].id == id)
- break;
- if (which == img_n) return 0;
- img_comp[which].hd = z >> 4; if (img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG");
- img_comp[which].ha = z & 15; if (img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG");
- order[i] = which;
- }
- if (get8() != 0) return e("bad SOS","Corrupt JPEG");
- get8(); // should be 63, but might be 0
- if (get8() != 0) return e("bad SOS","Corrupt JPEG");
-
- return 1;
-}
-
-static int process_frame_header(int scan)
-{
- int Lf,p,i,z, h_max=1,v_max=1;
- Lf = get16(); if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG
- p = get8(); if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
- img_y = get16(); if (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
- img_x = get16(); if (img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires
- img_n = get8();
- if (img_n != 3 && img_n != 1) return e("bad component count","Corrupt JPEG"); // JFIF requires
-
- if (Lf != 8+3*img_n) return e("bad SOF len","Corrupt JPEG");
-
- for (i=0; i < img_n; ++i) {
- img_comp[i].id = get8();
- if (img_comp[i].id != i+1) // JFIF requires
- if (img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files!
- return e("bad component ID","Corrupt JPEG");
- z = get8();
- img_comp[i].h = (z >> 4); if (!img_comp[i].h || img_comp[i].h > 4) return e("bad H","Corrupt JPEG");
- img_comp[i].v = z & 15; if (!img_comp[i].v || img_comp[i].v > 4) return e("bad V","Corrupt JPEG");
- img_comp[i].tq = get8(); if (img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG");
- }
-
- if (scan != SCAN_load) return 1;
-
- if ((1 << 30) / img_x / img_n < img_y) return e("too large", "Image too large to decode");
-
- for (i=0; i < img_n; ++i) {
- if (img_comp[i].h > h_max) h_max = img_comp[i].h;
- if (img_comp[i].v > v_max) v_max = img_comp[i].v;
- }
-
- // compute interleaved mcu info
- img_h_max = h_max;
- img_v_max = v_max;
- img_mcu_w = h_max * 8;
- img_mcu_h = v_max * 8;
- img_mcu_x = (img_x + img_mcu_w-1) / img_mcu_w;
- img_mcu_y = (img_y + img_mcu_h-1) / img_mcu_h;
-
- for (i=0; i < img_n; ++i) {
- // number of effective pixels (e.g. for non-interleaved MCU)
- img_comp[i].x = (img_x * img_comp[i].h + h_max-1) / h_max;
- img_comp[i].y = (img_y * img_comp[i].v + v_max-1) / v_max;
- // to simplify generation, we'll allocate enough memory to decode
- // the bogus oversized data from using interleaved MCUs and their
- // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
- // discard the extra data until colorspace conversion
- img_comp[i].w2 = img_mcu_x * img_comp[i].h * 8;
- img_comp[i].h2 = img_mcu_y * img_comp[i].v * 8;
- img_comp[i].raw_data = malloc(img_comp[i].w2 * img_comp[i].h2+15);
- if (img_comp[i].raw_data == NULL) {
- for(--i; i >= 0; --i) {
- free(img_comp[i].raw_data);
- img_comp[i].data = NULL;
- }
- return e("outofmem", "Out of memory");
- }
- img_comp[i].data = (uint8*) (((int) img_comp[i].raw_data + 15) & ~15);
- 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(int scan)
-{
- int m;
- marker = MARKER_none; // initialize cached marker to empty
- m = get_marker();
- if (!SOI(m)) return e("no SOI","Corrupt JPEG");
- if (scan == SCAN_type) return 1;
- m = get_marker();
- while (!SOF(m)) {
- if (!process_marker(m)) return 0;
- m = get_marker();
- while (m == MARKER_none) {
- // some files have extra padding after their blocks, so ok, we'll scan
- if (at_eof()) return e("no SOF", "Corrupt JPEG");
- m = get_marker();
- }
- }
- if (!process_frame_header(scan)) return 0;
- return 1;
-}
-
-static int decode_jpeg_image(void)
-{
- int m;
- restart_interval = 0;
- if (!decode_jpeg_header(SCAN_load)) return 0;
- m = get_marker();
- while (!EOI(m)) {
- if (SOS(m)) {
- if (!process_scan_header()) return 0;
- if (!parse_entropy_coded_data()) return 0;
- } else {
- if (!process_marker(m)) return 0;
- }
- m = get_marker();
- }
- 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)
-{
- 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;
- 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];
- 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);
- 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, uint8 *y, uint8 *pcb, 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;
- }
-}
-
-#if 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(void)
-{
- int i;
- for (i=0; i < img_n; ++i) {
- if (img_comp[i].data) {
- free(img_comp[i].raw_data);
- img_comp[i].data = NULL;
- }
- if (img_comp[i].linebuf) {
- free(img_comp[i].linebuf);
- 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(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");
-
- // load a jpeg image from whichever source
- if (!decode_jpeg_image()) { cleanup_jpeg(); return NULL; }
-
- // determine actual number of components to generate
- n = req_comp ? req_comp : img_n;
-
- if (img_n == 3 && n < 3)
- decode_n = 1;
- else
- decode_n = 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
- img_comp[k].linebuf = (uint8 *) malloc(img_x + 3);
- if (!img_comp[k].linebuf) { cleanup_jpeg(); return epuc("outofmem", "Out of memory"); }
-
- r->hs = img_h_max / img_comp[k].h;
- r->vs = img_v_max / img_comp[k].v;
- r->ystep = r->vs >> 1;
- r->w_lores = (img_x + r->hs-1) / r->hs;
- r->ypos = 0;
- r->line0 = r->line1 = 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 * img_x * img_y + 1);
- if (!output) { cleanup_jpeg(); return epuc("outofmem", "Out of memory"); }
-
- // now go ahead and resample
- for (j=0; j < img_y; ++j) {
- uint8 *out = output + n * 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(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 < img_comp[k].y)
- r->line1 += img_comp[k].w2;
- }
- }
- if (n >= 3) {
- uint8 *y = coutput[0];
- if (img_n == 3) {
- #if STBI_SIMD
- stbi_YCbCr_installed(out, y, coutput[1], coutput[2], img_x, n);
- #else
- YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], img_x, n);
- #endif
- } else
- for (i=0; i < 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 < img_x; ++i) out[i] = y[i];
- else
- for (i=0; i < img_x; ++i) *out++ = y[i], *out++ = 255;
- }
- }
- cleanup_jpeg();
- *out_x = img_x;
- *out_y = img_y;
- if (comp) *comp = img_n; // report original components, not output
- return output;
- }
-}
-
-#ifndef STBI_NO_STDIO
-unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- start_file(f);
- return load_jpeg_image(x,y,comp,req_comp);
-}
-
-unsigned char *stbi_jpeg_load(char const *filename, int *x, int *y, int *comp, int req_comp)
-{
- unsigned char *data;
- FILE *f = fopen(filename, "rb");
- if (!f) return NULL;
- data = stbi_jpeg_load_from_file(f,x,y,comp,req_comp);
- fclose(f);
- return data;
-}
-#endif
-
-unsigned char *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- start_mem(buffer,len);
- return load_jpeg_image(x,y,comp,req_comp);
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_jpeg_test_file(FILE *f)
-{
- int n,r;
- n = ftell(f);
- start_file(f);
- r = decode_jpeg_header(SCAN_type);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_jpeg_test_memory(stbi_uc const *buffer, int len)
-{
- start_mem(buffer,len);
- return decode_jpeg_header(SCAN_type);
-}
-
-// @TODO:
-#ifndef STBI_NO_STDIO
-extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp);
-extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp);
-#endif
-extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *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;
-
-__forceinline 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;
-}
-
-__forceinline 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
-
-static uint8 *zbuffer, *zbuffer_end;
-
-__forceinline static int zget8(void)
-{
- if (zbuffer >= zbuffer_end) return 0;
- return *zbuffer++;
-}
-
-//static uint32 code_buffer;
-static int num_bits;
-
-static void fill_bits(void)
-{
- do {
- assert(code_buffer < (1U << num_bits));
- code_buffer |= zget8() << num_bits;
- num_bits += 8;
- } while (num_bits <= 24);
-}
-
-__forceinline static unsigned int zreceive(int n)
-{
- unsigned int k;
- if (num_bits < n) fill_bits();
- k = code_buffer & ((1 << n) - 1);
- code_buffer >>= n;
- num_bits -= n;
- return k;
-}
-
-__forceinline static int zhuffman_decode(zhuffman *z)
-{
- int b,s,k;
- if (num_bits < 16) fill_bits();
- b = z->fast[code_buffer & ZFAST_MASK];
- if (b < 0xffff) {
- s = z->size[b];
- code_buffer >>= s;
- 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(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);
- code_buffer >>= s;
- num_bits -= s;
- return z->value[b];
-}
-
-static char *zout;
-static char *zout_start;
-static char *zout_end;
-static int z_expandable;
-
-static int expand(int n) // need to make room for n bytes
-{
- char *q;
- int cur, limit;
- if (!z_expandable) return e("output buffer limit","Corrupt PNG");
- cur = (int) (zout - zout_start);
- limit = (int) (zout_end - zout_start);
- while (cur + n > limit)
- limit *= 2;
- q = (char *) realloc(zout_start, limit);
- if (q == NULL) return e("outofmem", "Out of memory");
- zout_start = q;
- zout = q + cur;
- zout_end = q + limit;
- return 1;
-}
-
-static zhuffman z_length, z_distance;
-
-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(void)
-{
- for(;;) {
- int z = zhuffman_decode(&z_length);
- if (z < 256) {
- if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes
- if (zout >= zout_end) if (!expand(1)) return 0;
- *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(length_extra[z]);
- z = zhuffman_decode(&z_distance);
- if (z < 0) return e("bad huffman code","Corrupt PNG");
- dist = dist_base[z];
- if (dist_extra[z]) dist += zreceive(dist_extra[z]);
- if (zout - zout_start < dist) return e("bad dist","Corrupt PNG");
- if (zout + len > zout_end) if (!expand(len)) return 0;
- p = (uint8 *) (zout - dist);
- while (len--)
- *zout++ = *p++;
- }
- }
-}
-
-static int compute_huffman_codes(void)
-{
- static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
- static zhuffman z_codelength; // static just to save stack space
- uint8 lencodes[286+32+137];//padding for maximum single op
- uint8 codelength_sizes[19];
- int i,n;
-
- int hlit = zreceive(5) + 257;
- int hdist = zreceive(5) + 1;
- int hclen = zreceive(4) + 4;
-
- memset(codelength_sizes, 0, sizeof(codelength_sizes));
- for (i=0; i < hclen; ++i) {
- int s = zreceive(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(&z_codelength);
- assert(c >= 0 && c < 19);
- if (c < 16)
- lencodes[n++] = (uint8) c;
- else if (c == 16) {
- c = zreceive(2)+3;
- memset(lencodes+n, lencodes[n-1], c);
- n += c;
- } else if (c == 17) {
- c = zreceive(3)+3;
- memset(lencodes+n, 0, c);
- n += c;
- } else {
- assert(c == 18);
- c = zreceive(7)+11;
- memset(lencodes+n, 0, c);
- n += c;
- }
- }
- if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG");
- if (!zbuild_huffman(&z_length, lencodes, hlit)) return 0;
- if (!zbuild_huffman(&z_distance, lencodes+hlit, hdist)) return 0;
- return 1;
-}
-
-static int parse_uncompressed_block(void)
-{
- uint8 header[4];
- int len,nlen,k;
- if (num_bits & 7)
- zreceive(num_bits & 7); // discard
- // drain the bit-packed data into header
- k = 0;
- while (num_bits > 0) {
- header[k++] = (uint8) (code_buffer & 255); // wtf this warns?
- code_buffer >>= 8;
- num_bits -= 8;
- }
- assert(num_bits == 0);
- // now fill header the normal way
- while (k < 4)
- header[k++] = (uint8) zget8();
- len = header[1] * 256 + header[0];
- nlen = header[3] * 256 + header[2];
- if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG");
- if (zbuffer + len > zbuffer_end) return e("read past buffer","Corrupt PNG");
- if (zout + len > zout_end)
- if (!expand(len)) return 0;
- memcpy(zout, zbuffer, len);
- zbuffer += len;
- zout += len;
- return 1;
-}
-
-static int parse_zlib_header(void)
-{
- int cmf = zget8();
- int cm = cmf & 15;
- /* int cinfo = cmf >> 4; */
- int flg = zget8();
- 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;
-}
-
-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;
-}
-
-static int parse_zlib(int parse_header)
-{
- int final, type;
- if (parse_header)
- if (!parse_zlib_header()) return 0;
- num_bits = 0;
- code_buffer = 0;
- do {
- final = zreceive(1);
- type = zreceive(2);
- if (type == 0) {
- if (!parse_uncompressed_block()) return 0;
- } else if (type == 3) {
- return 0;
- } else {
- if (type == 1) {
- // use fixed code lengths
- if (!default_length[0]) init_defaults();
- if (!zbuild_huffman(&z_length , default_length , 288)) return 0;
- if (!zbuild_huffman(&z_distance, default_distance, 32)) return 0;
- } else {
- if (!compute_huffman_codes()) return 0;
- }
- if (!parse_huffman_block()) return 0;
- }
- } while (!final);
- return 1;
-}
-
-static int do_zlib(char *obuf, int olen, int exp, int parse_header)
-{
- zout_start = obuf;
- zout = obuf;
- zout_end = obuf + olen;
- z_expandable = exp;
-
- return parse_zlib(parse_header);
-}
-
-char *stbi_zlib_decode_malloc_guesssize(int initial_size, int *outlen)
-{
- char *p = (char *) malloc(initial_size);
- if (p == NULL) return NULL;
- if (do_zlib(p, initial_size, 1, 1)) {
- *outlen = (int) (zout - zout_start);
- return zout_start;
- } else {
- free(zout_start);
- return NULL;
- }
-}
-
-char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
-{
- zbuffer = (uint8 *) buffer;
- zbuffer_end = (uint8 *) buffer+len;
- return stbi_zlib_decode_malloc_guesssize(16384, outlen);
-}
-
-int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
-{
- zbuffer = (uint8 *) ibuffer;
- zbuffer_end = (uint8 *) ibuffer + ilen;
- if (do_zlib(obuffer, olen, 0, 1))
- return (int) (zout - zout_start);
- else
- return -1;
-}
-
-char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
-{
- char *p = (char *) malloc(16384);
- if (p == NULL) return NULL;
- zbuffer = (uint8 *) buffer;
- zbuffer_end = (uint8 *) buffer+len;
- if (do_zlib(p, 16384, 1, 0)) {
- *outlen = (int) (zout - zout_start);
- return zout_start;
- } else {
- free(zout_start);
- return NULL;
- }
-}
-
-int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
-{
- zbuffer = (uint8 *) ibuffer;
- zbuffer_end = (uint8 *) ibuffer + ilen;
- if (do_zlib(obuffer, olen, 0, 0))
- return (int) (zout - 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(void)
-{
- chunk c;
- c.length = get32();
- c.type = get32();
- return c;
-}
-
-static int check_png_header(void)
-{
- static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 };
- int i;
- for (i=0; i < 8; ++i)
- if (get8() != png_sig[i]) return e("bad png sig","Not a PNG");
- return 1;
-}
-
-static uint8 *idata, *expanded, *out;
-
-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(uint8 *raw, uint32 raw_len, int out_n)
-{
- uint32 i,j,stride = img_x*out_n;
- int k;
- assert(out_n == img_n || out_n == img_n+1);
- out = (uint8 *) malloc(img_x * img_y * out_n);
- if (!out) return e("outofmem", "Out of memory");
- if (raw_len != (img_n * img_x + 1) * img_y) return e("not enough pixels","Corrupt PNG");
- for (j=0; j < img_y; ++j) {
- uint8 *cur = 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=1; i < img_x; ++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=1; i < img_x; ++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 compute_transparency(uint8 tc[3], int out_n)
-{
- uint32 i, pixel_count = img_x * img_y;
- uint8 *p = 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);
-
- p = out;
- 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(uint8 *palette, int len, int pal_img_n)
-{
- uint32 i, pixel_count = img_x * img_y;
- uint8 *p, *temp_out, *orig = 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(out);
- out = temp_out;
- return 1;
-}
-
-static int parse_png_file(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;
-
- if (!check_png_header()) return 0;
-
- if (scan == SCAN_type) return 1;
-
- for(;;first=0) {
- chunk c = get_chunk_header();
- if (first && c.type != PNG_TYPE('I','H','D','R'))
- return e("first not IHDR","Corrupt PNG");
- switch (c.type) {
- case PNG_TYPE('I','H','D','R'): {
- int depth,color,interlace,comp,filter;
- if (!first) return e("multiple IHDR","Corrupt PNG");
- if (c.length != 13) return e("bad IHDR len","Corrupt PNG");
- img_x = get32(); if (img_x > (1 << 24)) return e("too large","Very large image (corrupt?)");
- img_y = get32(); if (img_y > (1 << 24)) return e("too large","Very large image (corrupt?)");
- depth = get8(); if (depth != 8) return e("8bit only","PNG not supported: 8-bit only");
- color = get8(); 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(); if (comp) return e("bad comp method","Corrupt PNG");
- filter= get8(); if (filter) return e("bad filter method","Corrupt PNG");
- interlace = get8(); if (interlace) return e("interlaced","PNG not supported: interlaced mode");
- if (!img_x || !img_y) return e("0-pixel image","Corrupt PNG");
- if (!pal_img_n) {
- img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
- if ((1 << 30) / img_x / img_n < 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.
- img_n = 1;
- if ((1 << 30) / img_x / 4 < 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 (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();
- palette[i*4+1] = get8u();
- palette[i*4+2] = get8u();
- palette[i*4+3] = 255;
- }
- break;
- }
-
- case PNG_TYPE('t','R','N','S'): {
- if (idata) return e("tRNS after IDAT","Corrupt PNG");
- if (pal_img_n) {
- if (scan == SCAN_header) { 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();
- } else {
- if (!(img_n & 1)) return e("tRNS with alpha","Corrupt PNG");
- if (c.length != (uint32) img_n*2) return e("bad tRNS len","Corrupt PNG");
- has_trans = 1;
- for (k=0; k < img_n; ++k)
- tc[k] = (uint8) get16(); // non 8-bit images will be larger
- }
- break;
- }
-
- case PNG_TYPE('I','D','A','T'): {
- if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG");
- if (scan == SCAN_header) { 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(idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory");
- idata = p;
- }
- #ifndef STBI_NO_STDIO
- if (img_file)
- {
- if (fread(idata+ioff,1,c.length,img_file) != c.length) return e("outofdata","Corrupt PNG");
- }
- else
- #endif
- {
- memcpy(idata+ioff, img_buffer, c.length);
- img_buffer += c.length;
- }
- ioff += c.length;
- break;
- }
-
- case PNG_TYPE('I','E','N','D'): {
- uint32 raw_len;
- if (scan != SCAN_load) return 1;
- if (idata == NULL) return e("no IDAT","Corrupt PNG");
- expanded = (uint8 *) stbi_zlib_decode_malloc((char *) idata, ioff, (int *) &raw_len);
- if (expanded == NULL) return 0; // zlib should set error
- free(idata); idata = NULL;
- if ((req_comp == img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
- img_out_n = img_n+1;
- else
- img_out_n = img_n;
- if (!create_png_image(expanded, raw_len, img_out_n)) return 0;
- if (has_trans)
- if (!compute_transparency(tc, img_out_n)) return 0;
- if (pal_img_n) {
- // pal_img_n == 3 or 4
- img_n = pal_img_n; // record the actual colors we had
- img_out_n = pal_img_n;
- if (req_comp >= 3) img_out_n = req_comp;
- if (!expand_palette(palette, pal_len, img_out_n))
- return 0;
- }
- free(expanded); expanded = NULL;
- return 1;
- }
-
- default:
- // if critical, fail
- if ((c.type & (1 << 29)) == 0) {
- #ifndef STBI_NO_FAILURE_STRINGS
- 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(c.length);
- break;
- }
- // end of chunk, read and skip CRC
- get8(); get8(); get8(); get8();
- }
-}
-
-static unsigned char *do_png(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(SCAN_load, req_comp)) {
- result = out;
- out = NULL;
- if (req_comp && req_comp != img_out_n) {
- result = convert_format(result, img_out_n, req_comp);
- if (result == NULL) return result;
- }
- *x = img_x;
- *y = img_y;
- if (n) *n = img_n;
- }
- free(out); out = NULL;
- free(expanded); expanded = NULL;
- free(idata); idata = NULL;
-
- return result;
-}
-
-#ifndef STBI_NO_STDIO
-unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- start_file(f);
- return do_png(x,y,comp,req_comp);
-}
-
-unsigned char *stbi_png_load(char const *filename, int *x, int *y, int *comp, int req_comp)
-{
- unsigned char *data;
- FILE *f = fopen(filename, "rb");
- if (!f) return NULL;
- data = stbi_png_load_from_file(f,x,y,comp,req_comp);
- fclose(f);
- return data;
-}
-#endif
-
-unsigned char *stbi_png_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- start_mem(buffer,len);
- return do_png(x,y,comp,req_comp);
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_png_test_file(FILE *f)
-{
- int n,r;
- n = ftell(f);
- start_file(f);
- r = parse_png_file(SCAN_type,STBI_default);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_png_test_memory(stbi_uc const *buffer, int len)
-{
- start_mem(buffer, len);
- return parse_png_file(SCAN_type,STBI_default);
-}
-
-// TODO: load header from png
-#ifndef STBI_NO_STDIO
-extern int stbi_png_info (char const *filename, int *x, int *y, int *comp);
-extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp);
-#endif
-extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp);
-
-// Microsoft/Windows BMP image
-
-static int bmp_test(void)
-{
- int sz;
- if (get8() != 'B') return 0;
- if (get8() != 'M') return 0;
- get32le(); // discard filesize
- get16le(); // discard reserved
- get16le(); // discard reserved
- get32le(); // discard data offset
- sz = get32le();
- if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1;
- return 0;
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_bmp_test_file (FILE *f)
-{
- int r,n = ftell(f);
- start_file(f);
- r = bmp_test();
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_bmp_test_memory (stbi_uc const *buffer, int len)
-{
- start_mem(buffer, len);
- return bmp_test();
-}
-
-// 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(int *x, int *y, int *comp, int req_comp)
-{
- 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() != 'B' || get8() != 'M') return epuc("not BMP", "Corrupt BMP");
- get32le(); // discard filesize
- get16le(); // discard reserved
- get16le(); // discard reserved
- offset = get32le();
- hsz = get32le();
- if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown");
- failure_reason = "bad BMP";
- if (hsz == 12) {
- img_x = get16le();
- img_y = get16le();
- } else {
- img_x = get32le();
- img_y = get32le();
- }
- if (get16le() != 1) return 0;
- bpp = get16le();
- if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit");
- flip_vertically = ((int) img_y) > 0;
- img_y = abs((int) img_y);
- if (hsz == 12) {
- if (bpp < 24)
- psize = (offset - 14 - 24) / 3;
- } else {
- compress = get32le();
- if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE");
- get32le(); // discard sizeof
- get32le(); // discard hres
- get32le(); // discard vres
- get32le(); // discard colorsused
- get32le(); // discard max important
- if (hsz == 40 || hsz == 56) {
- if (hsz == 56) {
- get32le();
- get32le();
- get32le();
- get32le();
- }
- if (bpp == 16 || bpp == 32) {
- mr = mg = mb = 0;
- if (compress == 0) {
- if (bpp == 32) {
- mr = 0xff << 16;
- mg = 0xff << 8;
- mb = 0xff << 0;
- } else {
- mr = 31 << 10;
- mg = 31 << 5;
- mb = 31 << 0;
- }
- } else if (compress == 3) {
- mr = get32le();
- mg = get32le();
- mb = get32le();
- // not documented, but generated by photoshop and handled by mspaint
- if (mr == mg && mg == mb) {
- // ?!?!?
- return NULL;
- }
- } else
- return NULL;
- }
- } else {
- assert(hsz == 108);
- mr = get32le();
- mg = get32le();
- mb = get32le();
- ma = get32le();
- get32le(); // discard color space
- for (i=0; i < 12; ++i)
- get32le(); // discard color space parameters
- }
- if (bpp < 16)
- psize = (offset - 14 - hsz) >> 2;
- }
- img_n = ma ? 4 : 3;
- if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
- target = req_comp;
- else
- target = img_n; // if they want monochrome, we'll post-convert
- out = (stbi_uc *) malloc(target * img_x * img_y);
- if (!out) return epuc("outofmem", "Out of memory");
- if (bpp < 16) {
- int z=0;
- if (psize == 0 || psize > 256) return epuc("invalid", "Corrupt BMP");
- for (i=0; i < psize; ++i) {
- pal[i][2] = get8();
- pal[i][1] = get8();
- pal[i][0] = get8();
- if (hsz != 12) get8();
- pal[i][3] = 255;
- }
- skip(offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4));
- if (bpp == 4) width = (img_x + 1) >> 1;
- else if (bpp == 8) width = img_x;
- else return epuc("bad bpp", "Corrupt BMP");
- pad = (-width)&3;
- for (j=0; j < (int) img_y; ++j) {
- for (i=0; i < (int) img_x; i += 2) {
- int v=get8(),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) img_x) break;
- v = (bpp == 8) ? get8() : v2;
- out[z++] = pal[v][0];
- out[z++] = pal[v][1];
- out[z++] = pal[v][2];
- if (target == 4) out[z++] = 255;
- }
- skip(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(offset - 14 - hsz);
- if (bpp == 24) width = 3 * img_x;
- else if (bpp == 16) width = 2*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 == 0xff000000 && ma == 0xff000000)
- easy = 2;
- }
- if (!easy) {
- if (!mr || !mg || !mb) 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) img_y; ++j) {
- if (easy) {
- for (i=0; i < (int) img_x; ++i) {
- int a;
- out[z+2] = get8();
- out[z+1] = get8();
- out[z+0] = get8();
- z += 3;
- a = (easy == 2 ? get8() : 255);
- if (target == 4) out[z++] = a;
- }
- } else {
- for (i=0; i < (int) img_x; ++i) {
- uint32 v = (bpp == 16 ? get16le() : get32le());
- int a;
- out[z++] = shiftsigned(v & mr, rshift, rcount);
- out[z++] = shiftsigned(v & mg, gshift, gcount);
- out[z++] = shiftsigned(v & mb, bshift, bcount);
- a = (ma ? shiftsigned(v & ma, ashift, acount) : 255);
- if (target == 4) out[z++] = a;
- }
- }
- skip(pad);
- }
- }
- if (flip_vertically) {
- stbi_uc t;
- for (j=0; j < (int) img_y>>1; ++j) {
- stbi_uc *p1 = out + j *img_x*target;
- stbi_uc *p2 = out + (img_y-1-j)*img_x*target;
- for (i=0; i < (int) 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);
- if (out == NULL) return out; // convert_format frees input on failure
- }
-
- *x = img_x;
- *y = img_y;
- if (comp) *comp = target;
- return out;
-}
-
-#ifndef STBI_NO_STDIO
-stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp)
-{
- stbi_uc *data;
- FILE *f = fopen(filename, "rb");
- if (!f) return NULL;
- data = stbi_bmp_load_from_file(f, x,y,comp,req_comp);
- fclose(f);
- return data;
-}
-
-stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- start_file(f);
- return bmp_load(x,y,comp,req_comp);
-}
-#endif
-
-stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- start_mem(buffer, len);
- return bmp_load(x,y,comp,req_comp);
-}
-
-// Targa Truevision - TGA
-// by Jonathan Dummer
-
-static int tga_test(void)
-{
- int sz;
- get8u(); // discard Offset
- sz = get8u(); // color type
- if( sz > 1 ) return 0; // only RGB or indexed allowed
- sz = get8u(); // image type
- if( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE
- get16(); // discard palette start
- get16(); // discard palette length
- get8(); // discard bits per palette color entry
- get16(); // discard x origin
- get16(); // discard y origin
- if( get16() < 1 ) return 0; // test width
- if( get16() < 1 ) return 0; // test height
- sz = get8(); // 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
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_tga_test_file (FILE *f)
-{
- int r,n = ftell(f);
- start_file(f);
- r = tga_test();
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_tga_test_memory (stbi_uc const *buffer, int len)
-{
- start_mem(buffer, len);
- return tga_test();
-}
-
-static stbi_uc *tga_load(int *x, int *y, int *comp, int req_comp)
-{
- // read in the TGA header stuff
- int tga_offset = get8u();
- int tga_indexed = get8u();
- int tga_image_type = get8u();
- int tga_is_RLE = 0;
- int tga_palette_start = get16le();
- int tga_palette_len = get16le();
- int tga_palette_bits = get8u();
- int tga_x_origin = get16le();
- int tga_y_origin = get16le();
- int tga_width = get16le();
- int tga_height = get16le();
- int tga_bits_per_pixel = get8u();
- int tga_inverted = get8u();
- // 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;
- }
-
- // 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 );
-
- // skip to the data's starting position (offset usually = 0)
- skip( tga_offset );
- // do I need to load a palette?
- if( tga_indexed )
- {
- // any data to skip? (offset usually = 0)
- skip( tga_palette_start );
- // load the palette
- tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 );
- getn( tga_palette, tga_palette_len * tga_palette_bits / 8 );
- }
- // 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 chunk?
- if( tga_is_RLE )
- {
- if( RLE_count == 0 )
- {
- // yep, get the next byte as a RLE command
- int RLE_cmd = get8u();
- 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();
- 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();
- }
- }
- // 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;
-}
-
-#ifndef STBI_NO_STDIO
-stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp)
-{
- stbi_uc *data;
- FILE *f = fopen(filename, "rb");
- if (!f) return NULL;
- data = stbi_tga_load_from_file(f, x,y,comp,req_comp);
- fclose(f);
- return data;
-}
-
-stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- start_file(f);
- return tga_load(x,y,comp,req_comp);
-}
-#endif
-
-stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- start_mem(buffer, len);
- return tga_load(x,y,comp,req_comp);
-}
-
-
-// *************************************************************************************************
-// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicholas Schulz, tweaked by STB
-
-static int psd_test(void)
-{
- if (get32() != 0x38425053) return 0; // "8BPS"
- else return 1;
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_psd_test_file(FILE *f)
-{
- int r,n = ftell(f);
- start_file(f);
- r = psd_test();
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_psd_test_memory(stbi_uc const *buffer, int len)
-{
- start_mem(buffer, len);
- return psd_test();
-}
-
-static stbi_uc *psd_load(int *x, int *y, int *comp, int req_comp)
-{
- int pixelCount;
- int channelCount, compression;
- int channel, i, count, len;
- int w,h;
-
- // Check identifier
- if (get32() != 0x38425053) // "8BPS"
- return epuc("not PSD", "Corrupt PSD image");
-
- // Check file type version.
- if (get16() != 1)
- return epuc("wrong version", "Unsupported version of PSD image");
-
- // Skip 6 reserved bytes.
- skip( 6 );
-
- // Read the number of channels (R, G, B, A, etc).
- channelCount = get16();
- 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();
- w = get32();
-
- // Make sure the depth is 8 bits.
- if (get16() != 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() != 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(get32() );
-
- // Skip the image resources. (resolution, pen tool paths, etc)
- skip( get32() );
-
- // Skip the reserved data.
- skip( get32() );
-
- // Find out if the data is compressed.
- // Known values:
- // 0: no compression
- // 1: RLE compressed
- compression = get16();
- if (compression > 1)
- return epuc("unknown compression type", "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( 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();
- if (len == 128) {
- // No-op.
- } else if (len < 128) {
- // Copy next len+1 bytes literally.
- len++;
- count += len;
- while (len) {
- *p = get8();
- p += 4;
- len--;
- }
- } else if (len > 128) {
- uint32 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 = get8();
- 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.
- count = 0;
- for (i = 0; i < pixelCount; i++)
- *p = get8(), p += 4;
- }
- }
- }
-
- if (req_comp && req_comp != 4) {
- img_x = w;
- img_y = h;
- out = convert_format(out, 4, req_comp);
- if (out == NULL) return out; // convert_format frees input on failure
- }
-
- if (comp) *comp = channelCount;
- *y = h;
- *x = w;
-
- return out;
-}
-
-#ifndef STBI_NO_STDIO
-stbi_uc *stbi_psd_load(char const *filename, int *x, int *y, int *comp, int req_comp)
-{
- stbi_uc *data;
- FILE *f = fopen(filename, "rb");
- if (!f) return NULL;
- data = stbi_psd_load_from_file(f, x,y,comp,req_comp);
- fclose(f);
- return data;
-}
-
-stbi_uc *stbi_psd_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- start_file(f);
- return psd_load(x,y,comp,req_comp);
-}
-#endif
-
-stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- start_mem(buffer, len);
- return psd_load(x,y,comp,req_comp);
-}
-
-
-// *************************************************************************************************
-// Radiance RGBE HDR loader
-// originally by Nicolas Schulz
-#ifndef STBI_NO_HDR
-static int hdr_test(void)
-{
- char *signature = "#?RADIANCE\n";
- int i;
- for (i=0; signature[i]; ++i)
- if (get8() != signature[i])
- return 0;
- return 1;
-}
-
-int stbi_hdr_test_memory(stbi_uc const *buffer, int len)
-{
- start_mem(buffer, len);
- return hdr_test();
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_hdr_test_file(FILE *f)
-{
- int r,n = ftell(f);
- start_file(f);
- r = hdr_test();
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-#define HDR_BUFLEN 1024
-static char *hdr_gettoken(char *buffer)
-{
- int len=0;
- char *s = buffer, c = '\0';
-
- c = get8();
-
- while (!at_eof() && c != '\n') {
- buffer[len++] = c;
- if (len == HDR_BUFLEN-1) {
- // flush to end of line
- while (!at_eof() && get8() != '\n')
- ;
- break;
- }
- c = get8();
- }
-
- 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(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(buffer), "#?RADIANCE") != 0)
- return epf("not HDR", "Corrupt HDR image");
-
- // Parse header
- while(1) {
- token = hdr_gettoken(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(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(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();
- c2 = get8();
- len = get8();
- 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] = { c1,c2,len, get8() };
- hdr_convert(hdr_data, rgbe, req_comp);
- i = 1;
- j = 0;
- free(scanline);
- goto main_decode_loop; // yes, this is fucking insane; blame the fucking insane format
- }
- len <<= 8;
- len |= get8();
- 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 = get8();
- if (count > 128) {
- // Run
- value = get8();
- 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] = get8();
- }
- }
- }
- 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;
-}
-
-#ifndef STBI_NO_STDIO
-float *stbi_hdr_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- start_file(f);
- return hdr_load(x,y,comp,req_comp);
-}
-#endif
-
-float *stbi_hdr_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
-{
- start_mem(buffer, len);
- return hdr_load(x,y,comp,req_comp);
-}
-
-#endif // STBI_NO_HDR
-
-/////////////////////// write image ///////////////////////
-
-#ifndef STBI_NO_WRITE
-
-static void write8(FILE *f, int x) { uint8 z = (uint8) x; fwrite(&z,1,1,f); }
-
-static void writefv(FILE *f, char *fmt, va_list v)
-{
- while (*fmt) {
- switch (*fmt++) {
- case ' ': break;
- case '1': { uint8 x = va_arg(v, int); write8(f,x); break; }
- case '2': { int16 x = va_arg(v, int); write8(f,x); write8(f,x>>8); break; }
- case '4': { int32 x = va_arg(v, int); write8(f,x); write8(f,x>>8); write8(f,x>>16); write8(f,x>>24); break; }
- default:
- assert(0);
- va_end(v);
- return;
- }
- }
-}
-
-static void writef(FILE *f, char *fmt, ...)
-{
- va_list v;
- va_start(v, fmt);
- writefv(f,fmt,v);
- va_end(v);
-}
-
-static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad)
-{
- uint8 bg[3] = { 255, 0, 255}, px[3];
- uint32 zero = 0;
- int i,j,k, j_end;
-
- if (vdir < 0)
- j_end = -1, j = y-1;
- else
- j_end = y, j = 0;
-
- for (; j != j_end; j += vdir) {
- for (i=0; i < x; ++i) {
- uint8 *d = (uint8 *) data + (j*x+i)*comp;
- if (write_alpha < 0)
- fwrite(&d[comp-1], 1, 1, f);
- switch (comp) {
- case 1:
- case 2: writef(f, "111", d[0],d[0],d[0]);
- break;
- case 4:
- if (!write_alpha) {
- for (k=0; k < 3; ++k)
- px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255;
- writef(f, "111", px[1-rgb_dir],px[1],px[1+rgb_dir]);
- break;
- }
- /* FALLTHROUGH */
- case 3:
- writef(f, "111", d[1-rgb_dir],d[1],d[1+rgb_dir]);
- break;
- }
- if (write_alpha > 0)
- fwrite(&d[comp-1], 1, 1, f);
- }
- fwrite(&zero,scanline_pad,1,f);
- }
-}
-
-static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, char *fmt, ...)
-{
- FILE *f = fopen(filename, "wb");
- if (f) {
- va_list v;
- va_start(v, fmt);
- writefv(f, fmt, v);
- va_end(v);
- write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad);
- fclose(f);
- }
- return f != NULL;
-}
-
-int stbi_write_bmp(char const *filename, int x, int y, int comp, void *data)
-{
- int pad = (-x*3) & 3;
- return outfile(filename,-1,-1,x,y,comp,data,0,pad,
- "11 4 22 4" "4 44 22 444444",
- 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header
- 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header
-}
-
-int stbi_write_tga(char const *filename, int x, int y, int comp, void *data)
-{
- int has_alpha = !(comp & 1);
- return outfile(filename, -1,-1, x, y, comp, data, has_alpha, 0,
- "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha);
-}
-
-// any other image formats that do interleaved rgb data?
-// PNG: requires adler32,crc32 -- significant amount of code
-// PSD: no, channels output separately
-// TIFF: no, stripwise-interleaved... i think
-
-#endif // STBI_NO_WRITE
+/* stbi-1.12 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c + when you control the images you're loading + + 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, no oddball channel decimations) + PNG non-interlaced + BMP non-1bpp, non-RLE + TGA (not sure what subset, if a subset) + PSD (composited view only, no extra channels) + HDR (radiance rgbE format) + writes BMP,TGA (define STBI_NO_WRITE to remove code) + decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) + supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) + + TODO: + stbi_info_* + + history: + 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 +*/ + + +//// begin header file //////////////////////////////////////////////////// +// +// Limitations: +// - no progressive/interlaced support (jpeg, png) +// - 8-bit samples only (jpeg, png) +// - not threadsafe +// - channel subsampling of at most 2 in each dimension (jpeg) +// - no delayed line count (jpeg) -- IJG doesn't support either +// +// 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 +// 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 and BMP images are automatically depalettized. +// +// +// =========================================================================== +// +// 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); + + +#ifndef STBI_NO_STDIO +#include <stdio.h> +#endif + +#ifndef STBI_NO_HDR +#include <math.h> // ldexp +#include <string.h> // strcmp +#endif + +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 + +// WRITING API + +#if !defined(STBI_NO_WRITE) && !defined(STBI_NO_STDIO) +// write a BMP/TGA file given tightly packed 'comp' channels (no padding, nor bmp-stride-padding) +// (you must include the appropriate extension in the filename). +// returns TRUE on success, FALSE if couldn't open file, error writing file +extern int stbi_write_bmp (char const *filename, int x, int y, int comp, void *data); +extern int stbi_write_tga (char const *filename, int x, int y, int comp, void *data); +#endif + +// PRIMARY API - works on images of any type + +// load image by filename, open file, or memory buffer +#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); +extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); +#endif +extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +// for stbi_load_from_file, file pointer is left pointing immediately after image + +#ifndef STBI_NO_HDR +#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_memory(stbi_uc const *buffer, int len, 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 + +// get a VERY brief reason for failure +extern 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_is_hdr_from_memory(stbi_uc const *buffer, int len); +#ifndef STBI_NO_STDIO +extern int stbi_info (char const *filename, int *x, int *y, int *comp); +extern int stbi_is_hdr (char const *filename); +extern int stbi_is_hdr_from_file(FILE *f); +#endif + +// ZLIB client - used by PNG, available for other purposes + +extern char *stbi_zlib_decode_malloc_guesssize(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); + +// TYPE-SPECIFIC ACCESS + +// is it a jpeg? +extern int stbi_jpeg_test_memory (stbi_uc const *buffer, int len); +extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); + +#ifndef STBI_NO_STDIO +extern stbi_uc *stbi_jpeg_load (char const *filename, int *x, int *y, int *comp, int req_comp); +extern int stbi_jpeg_test_file (FILE *f); +extern stbi_uc *stbi_jpeg_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); + +extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); +extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); +#endif + +extern int stbi_jpeg_dc_only; // only decode DC component + +// is it a png? +extern int stbi_png_test_memory (stbi_uc const *buffer, int len); +extern stbi_uc *stbi_png_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); + +#ifndef STBI_NO_STDIO +extern stbi_uc *stbi_png_load (char const *filename, int *x, int *y, int *comp, int req_comp); +extern int stbi_png_info (char const *filename, int *x, int *y, int *comp); +extern int stbi_png_test_file (FILE *f); +extern stbi_uc *stbi_png_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); +#endif + +// is it a bmp? +extern int stbi_bmp_test_memory (stbi_uc const *buffer, int len); + +extern stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp); +extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +#ifndef STBI_NO_STDIO +extern int stbi_bmp_test_file (FILE *f); +extern stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +#endif + +// is it a tga? +extern int stbi_tga_test_memory (stbi_uc const *buffer, int len); + +extern stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp); +extern stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +#ifndef STBI_NO_STDIO +extern int stbi_tga_test_file (FILE *f); +extern stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +#endif + +// is it a psd? +extern int stbi_psd_test_memory (stbi_uc const *buffer, int len); + +extern stbi_uc *stbi_psd_load (char const *filename, int *x, int *y, int *comp, int req_comp); +extern stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +#ifndef STBI_NO_STDIO +extern int stbi_psd_test_file (FILE *f); +extern stbi_uc *stbi_psd_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +#endif + +// is it an hdr? +extern int stbi_hdr_test_memory (stbi_uc const *buffer, int len); + +extern float * stbi_hdr_load (char const *filename, int *x, int *y, int *comp, int req_comp); +extern float * stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); +#ifndef STBI_NO_STDIO +extern int stbi_hdr_test_file (FILE *f); +extern float * stbi_hdr_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); +#endif + +// define new loaders +typedef struct +{ + int (*test_memory)(stbi_uc const *buffer, int len); + stbi_uc * (*load_from_memory)(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); + #ifndef STBI_NO_STDIO + int (*test_file)(FILE *f); + stbi_uc * (*load_from_file)(FILE *f, int *x, int *y, int *comp, int req_comp); + #endif +} stbi_loader; + +// register a loader by filling out the above structure (you must defined ALL functions) +// returns 1 if added or already added, 0 if not added (too many loaders) +extern int stbi_register_loader(stbi_loader *loader); + +// define faster low-level operations (typically SIMD support) +#if STBI_SIMD +typedef void (*stbi_idct_8x8)(uint8 *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)(uint8 *output, uint8 const *y, uint8 const *cb, uint8 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 ///////////////////////////////////////////////////// + +#ifndef STBI_NO_STDIO +#include <stdio.h> +#endif +#include <stdlib.h> +#include <memory.h> +#include <assert.h> +#include <stdarg.h> + +#if STBI_SIMD +#include <emmintrin.h> +#endif + +#ifndef _MSC_VER +#define __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]; + +#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE) +#define STBI_NO_WRITE +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// Generic API that works on all image types +// + +static char *failure_reason; + +char *stbi_failure_reason(void) +{ + return failure_reason; +} + +static int e(char *str) +{ + failure_reason = str; + return 0; +} + +#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); +} + +#define MAX_LOADERS 32 +stbi_loader *loaders[MAX_LOADERS]; +static int max_loaders = 0; + +int stbi_register_loader(stbi_loader *loader) +{ + int i; + for (i=0; i < MAX_LOADERS; ++i) { + // already present? + if (loaders[i] == loader) + return 1; + // end of the list? + if (loaders[i] == NULL) { + loaders[i] = loader; + max_loaders = i+1; + return 1; + } + } + // no room for it + return 0; +} + +#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 + +#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) +{ + int i; + if (stbi_jpeg_test_file(f)) + return stbi_jpeg_load_from_file(f,x,y,comp,req_comp); + if (stbi_png_test_file(f)) + return stbi_png_load_from_file(f,x,y,comp,req_comp); + if (stbi_bmp_test_file(f)) + return stbi_bmp_load_from_file(f,x,y,comp,req_comp); + if (stbi_psd_test_file(f)) + return stbi_psd_load_from_file(f,x,y,comp,req_comp); + #ifndef STBI_NO_HDR + if (stbi_hdr_test_file(f)) { + float *hdr = stbi_hdr_load_from_file(f, x,y,comp,req_comp); + return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); + } + #endif + for (i=0; i < max_loaders; ++i) + if (loaders[i]->test_file(f)) + return loaders[i]->load_from_file(f,x,y,comp,req_comp); + // test tga last because it's a crappy test! + if (stbi_tga_test_file(f)) + return stbi_tga_load_from_file(f,x,y,comp,req_comp); + return epuc("unknown image type", "Image not of any known type, or corrupt"); +} +#endif + +unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + int i; + if (stbi_jpeg_test_memory(buffer,len)) + return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp); + if (stbi_png_test_memory(buffer,len)) + return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp); + if (stbi_bmp_test_memory(buffer,len)) + return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp); + if (stbi_psd_test_memory(buffer,len)) + return stbi_psd_load_from_memory(buffer,len,x,y,comp,req_comp); + #ifndef STBI_NO_HDR + if (stbi_hdr_test_memory(buffer, len)) { + float *hdr = stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp); + return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); + } + #endif + for (i=0; i < max_loaders; ++i) + if (loaders[i]->test_memory(buffer,len)) + return loaders[i]->load_from_memory(buffer,len,x,y,comp,req_comp); + // test tga last because it's a crappy test! + if (stbi_tga_test_memory(buffer,len)) + return stbi_tga_load_from_memory(buffer,len,x,y,comp,req_comp); + return epuc("unknown image type", "Image not of any known type, or corrupt"); +} + +#ifndef STBI_NO_HDR + +#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) +{ + unsigned char *data; + #ifndef STBI_NO_HDR + if (stbi_hdr_test_file(f)) + return stbi_hdr_load_from_file(f,x,y,comp,req_comp); + #endif + data = stbi_load_from_file(f, 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"); +} +#endif + +float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + stbi_uc *data; + #ifndef STBI_NO_HDR + if (stbi_hdr_test_memory(buffer, len)) + return stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp); + #endif + data = stbi_load_from_memory(buffer, len, 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"); +} +#endif + +// 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! + +extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) +{ + #ifndef STBI_NO_HDR + return stbi_hdr_test_memory(buffer, len); + #else + 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 + return stbi_hdr_test_file(f); + #else + return 0; + #endif +} + +#endif + +// @TODO: get image dimensions & components without fully decoding +#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 +extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); + +#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 +// + +// image width, height, # components +static uint32 img_x, img_y; +static int img_n, img_out_n; + +enum +{ + SCAN_load=0, + SCAN_type, + SCAN_header, +}; + +// An API for reading either from memory or file. +#ifndef STBI_NO_STDIO +static FILE *img_file; +#endif +static uint8 const *img_buffer, *img_buffer_end; + +#ifndef STBI_NO_STDIO +static void start_file(FILE *f) +{ + img_file = f; +} +#endif + +static void start_mem(uint8 const *buffer, int len) +{ +#ifndef STBI_NO_STDIO + img_file = NULL; +#endif + img_buffer = buffer; + img_buffer_end = buffer+len; +} + +static int get8(void) +{ +#ifndef STBI_NO_STDIO + if (img_file) { + int c = fgetc(img_file); + return c == EOF ? 0 : c; + } +#endif + if (img_buffer < img_buffer_end) + return *img_buffer++; + return 0; +} + +static int at_eof(void) +{ +#ifndef STBI_NO_STDIO + if (img_file) + return feof(img_file); +#endif + return img_buffer >= img_buffer_end; +} + +static uint8 get8u(void) +{ + return (uint8) get8(); +} + +static void skip(int n) +{ +#ifndef STBI_NO_STDIO + if (img_file) + fseek(img_file, n, SEEK_CUR); + else +#endif + img_buffer += n; +} + +static int get16(void) +{ + int z = get8(); + return (z << 8) + get8(); +} + +static uint32 get32(void) +{ + uint32 z = get16(); + return (z << 16) + get16(); +} + +static int get16le(void) +{ + int z = get8(); + return z + (get8() << 8); +} + +static uint32 get32le(void) +{ + uint32 z = get16le(); + return z + (get16le() << 16); +} + +static void getn(stbi_uc *buffer, int n) +{ +#ifndef STBI_NO_STDIO + if (img_file) { + fread(buffer, 1, n, img_file); + return; + } +#endif + memcpy(buffer, img_buffer, n); + img_buffer += n; +} + +////////////////////////////////////////////////////////////////////////////// +// +// 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 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 * img_x * img_y); + if (good == NULL) { + free(data); + return epuc("outofmem", "Out of memory"); + } + + for (j=0; j < img_y; ++j) { + unsigned char *src = data + j * img_x * img_n ; + unsigned char *dest = good + j * img_x * req_comp; + + #define COMBO(a,b) ((a)*8+(b)) + #define CASE(a,b) case COMBO(a,b): for(i=0; i < img_x; ++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); + img_out_n = req_comp; + 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] = 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] = 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) + +int stbi_jpeg_dc_only; + +// 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; + +static huffman huff_dc[4]; // baseline is 2 tables, extended is 4 +static huffman huff_ac[4]; +static uint8 dequant[4][64]; +#if STBI_SIMD +static __declspec(align(16)) unsigned short dequant2[4][64]; +#endif + +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; +} + +// sizes for components, interleaved MCUs +static int img_h_max, img_v_max; +static int img_mcu_x, img_mcu_y; +static int img_mcu_w, img_mcu_h; + +// definition of jpeg image component +static 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]; + +static uint32 code_buffer; // jpeg entropy-coded buffer +static int code_bits; // number of valid bits +static unsigned char marker; // marker seen while filling entropy buffer +static int nomore; // flag if we saw a marker so must stop + +static void grow_buffer_unsafe(void) +{ + do { + int b = nomore ? 0 : get8(); + if (b == 0xff) { + int c = get8(); + if (c != 0) { + marker = (unsigned char) c; + nomore = 1; + return; + } + } + code_buffer = (code_buffer << 8) | b; + code_bits += 8; + } while (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 +__forceinline static int decode(huffman *h) +{ + unsigned int temp; + int c,k; + + if (code_bits < 16) grow_buffer_unsafe(); + + // look at the top FAST_BITS and determine what symbol ID it is, + // if the code is <= FAST_BITS + c = (code_buffer >> (code_bits - FAST_BITS)) & ((1 << FAST_BITS)-1); + k = h->fast[c]; + if (k < 255) { + if (h->size[k] > code_bits) + return -1; + code_bits -= h->size[k]; + 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. + if (code_bits < 16) + temp = (code_buffer << (16 - code_bits)) & 0xffff; + else + temp = (code_buffer >> (code_bits - 16)) & 0xffff; + for (k=FAST_BITS+1 ; ; ++k) + if (temp < h->maxcode[k]) + break; + if (k == 17) { + // error! code not found + code_bits -= 16; + return -1; + } + + if (k > code_bits) + return -1; + + // convert the huffman code to the symbol id + c = ((code_buffer >> (code_bits - k)) & bmask[k]) + h->delta[k]; + assert((((code_buffer) >> (code_bits - h->size[c])) & bmask[h->size[c]]) == h->code[c]); + + // convert the id to a symbol + code_bits -= k; + return h->values[c]; +} + +// combined JPEG 'receive' and JPEG 'extend', since baseline +// always extends everything it receives. +__forceinline static int extend_receive(int n) +{ + unsigned int m = 1 << (n-1); + unsigned int k; + if (code_bits < n) grow_buffer_unsafe(); + k = (code_buffer >> (code_bits - n)) & bmask[n]; + code_bits -= n; + // 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(short data[64], huffman *hdc, huffman *hac, int b) +{ + int diff,dc,k; + int t = decode(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(t) : 0; + dc = img_comp[b].dc_pred + diff; + 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(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(s); + } + } while (k < 64); + return 1; +} + +// take a -128..127 value and clamp it and convert to 0..255 +__forceinline static uint8 clamp(int x) +{ + x += 128; + // 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; + +#if !STBI_SIMD +// .344 seconds on 3*anemones.jpg +static void idct_block(uint8 *out, int out_stride, short data[64], uint8 *dequantize) +{ + int i,val[64],*v=val; + uint8 *o,*dq = dequantize; + short *d = data; + + if (stbi_jpeg_dc_only) { + // ok, I don't really know why this is right, but it seems to be: + int z = 128 + ((d[0] * dq[0]) >> 3); + for (i=0; i < 8; ++i) { + out[0] = out[1] = out[2] = out[3] = out[4] = out[5] = out[6] = out[7] = z; + out += out_stride; + } + return; + } + + // 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. + x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536; + 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); + } +} +#else +static void idct_block(uint8 *out, int out_stride, short data[64], unsigned short *dequantize) +{ + int i,val[64],*v=val; + uint8 *o; + unsigned short *dq = dequantize; + short *d = data; + + if (stbi_jpeg_dc_only) { + // ok, I don't really know why this is right, but it seems to be: + int z = 128 + ((d[0] * dq[0]) >> 3); + for (i=0; i < 8; ++i) { + out[0] = out[1] = out[2] = out[3] = out[4] = out[5] = out[6] = out[7] = z; + out += out_stride; + } + return; + } + + // 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. + x0 += 65536; x1 += 65536; x2 += 65536; x3 += 65536; + 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); + } +} +static stbi_idct_8x8 stbi_idct_installed = idct_block; + +extern 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(void) +{ + uint8 x; + if (marker != MARKER_none) { x = marker; marker = MARKER_none; return x; } + x = get8u(); + if (x != 0xff) return MARKER_none; + while (x == 0xff) + x = get8u(); + return x; +} + +// in each scan, we'll have scan_n components, and the order +// of the components is specified by order[] +static int scan_n, order[4]; +static int restart_interval, todo; +#define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) + +// after a restart interval, reset the entropy decoder and +// the dc prediction +static void reset(void) +{ + code_bits = 0; + code_buffer = 0; + nomore = 0; + img_comp[0].dc_pred = img_comp[1].dc_pred = img_comp[2].dc_pred = 0; + marker = MARKER_none; + todo = restart_interval ? 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(void) +{ + reset(); + if (scan_n == 1) { + int i,j; + #if STBI_SIMD + __declspec(align(16)) + #endif + short data[64]; + int n = 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 = (img_comp[n].x+7) >> 3; + int h = (img_comp[n].y+7) >> 3; + for (j=0; j < h; ++j) { + for (i=0; i < w; ++i) { + if (!decode_block(data, huff_dc+img_comp[n].hd, huff_ac+img_comp[n].ha, n)) return 0; + #if STBI_SIMD + stbi_idct_installed(img_comp[n].data+img_comp[n].w2*j*8+i*8, img_comp[n].w2, data, dequant2[img_comp[n].tq]); + #else + idct_block(img_comp[n].data+img_comp[n].w2*j*8+i*8, img_comp[n].w2, data, dequant[img_comp[n].tq]); + #endif + // every data block is an MCU, so countdown the restart interval + if (--todo <= 0) { + if (code_bits < 24) grow_buffer_unsafe(); + // if it's NOT a restart, then just bail, so we get corrupt data + // rather than no data + if (!RESTART(marker)) return 1; + reset(); + } + } + } + } else { // interleaved! + int i,j,k,x,y; + short data[64]; + for (j=0; j < img_mcu_y; ++j) { + for (i=0; i < img_mcu_x; ++i) { + // scan an interleaved mcu... process scan_n components in order + for (k=0; k < scan_n; ++k) { + int n = 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 < img_comp[n].v; ++y) { + for (x=0; x < img_comp[n].h; ++x) { + int x2 = (i*img_comp[n].h + x)*8; + int y2 = (j*img_comp[n].v + y)*8; + if (!decode_block(data, huff_dc+img_comp[n].hd, huff_ac+img_comp[n].ha, n)) return 0; + #if STBI_SIMD + stbi_idct_installed(img_comp[n].data+img_comp[n].w2*y2+x2, img_comp[n].w2, data, dequant2[img_comp[n].tq]); + #else + idct_block(img_comp[n].data+img_comp[n].w2*y2+x2, img_comp[n].w2, data, dequant[img_comp[n].tq]); + #endif + } + } + } + // after all interleaved components, that's an interleaved MCU, + // so now count down the restart interval + if (--todo <= 0) { + if (code_bits < 24) grow_buffer_unsafe(); + // if it's NOT a restart, then just bail, so we get corrupt data + // rather than no data + if (!RESTART(marker)) return 1; + reset(); + } + } + } + } + return 1; +} + +static int process_marker(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() != 4) return e("bad DRI len","Corrupt JPEG"); + restart_interval = get16(); + return 1; + + case 0xDB: // DQT - define quantization table + L = get16()-2; + while (L > 0) { + int z = get8(); + int p = z >> 4; + int t = z & 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) + dequant[t][dezigzag[i]] = get8u(); + #if STBI_SIMD + for (i=0; i < 64; ++i) + dequant2[t][i] = dequant[t][i]; + #endif + L -= 65; + } + return L==0; + + case 0xC4: // DHT - define huffman table + L = get16()-2; + while (L > 0) { + uint8 *v; + int sizes[16],i,m=0; + int z = get8(); + int tc = z >> 4; + int th = z & 15; + if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG"); + for (i=0; i < 16; ++i) { + sizes[i] = get8(); + m += sizes[i]; + } + L -= 17; + if (tc == 0) { + if (!build_huffman(huff_dc+th, sizes)) return 0; + v = huff_dc[th].values; + } else { + if (!build_huffman(huff_ac+th, sizes)) return 0; + v = huff_ac[th].values; + } + for (i=0; i < m; ++i) + v[i] = get8u(); + L -= m; + } + return L==0; + } + // check for comment block or APP blocks + if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { + skip(get16()-2); + return 1; + } + return 0; +} + +// after we see SOS +static int process_scan_header(void) +{ + int i; + int Ls = get16(); + scan_n = get8(); + if (scan_n < 1 || scan_n > 4 || scan_n > (int) img_n) return e("bad SOS component count","Corrupt JPEG"); + if (Ls != 6+2*scan_n) return e("bad SOS len","Corrupt JPEG"); + for (i=0; i < scan_n; ++i) { + int id = get8(), which; + int z = get8(); + for (which = 0; which < img_n; ++which) + if (img_comp[which].id == id) + break; + if (which == img_n) return 0; + img_comp[which].hd = z >> 4; if (img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG"); + img_comp[which].ha = z & 15; if (img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG"); + order[i] = which; + } + if (get8() != 0) return e("bad SOS","Corrupt JPEG"); + get8(); // should be 63, but might be 0 + if (get8() != 0) return e("bad SOS","Corrupt JPEG"); + + return 1; +} + +static int process_frame_header(int scan) +{ + int Lf,p,i,z, h_max=1,v_max=1; + Lf = get16(); if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG + p = get8(); if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline + img_y = get16(); if (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 + img_x = get16(); if (img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires + img_n = get8(); + if (img_n != 3 && img_n != 1) return e("bad component count","Corrupt JPEG"); // JFIF requires + + if (Lf != 8+3*img_n) return e("bad SOF len","Corrupt JPEG"); + + for (i=0; i < img_n; ++i) { + img_comp[i].id = get8(); + if (img_comp[i].id != i+1) // JFIF requires + if (img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files! + return e("bad component ID","Corrupt JPEG"); + z = get8(); + img_comp[i].h = (z >> 4); if (!img_comp[i].h || img_comp[i].h > 4) return e("bad H","Corrupt JPEG"); + img_comp[i].v = z & 15; if (!img_comp[i].v || img_comp[i].v > 4) return e("bad V","Corrupt JPEG"); + img_comp[i].tq = get8(); if (img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG"); + } + + if (scan != SCAN_load) return 1; + + if ((1 << 30) / img_x / img_n < img_y) return e("too large", "Image too large to decode"); + + for (i=0; i < img_n; ++i) { + if (img_comp[i].h > h_max) h_max = img_comp[i].h; + if (img_comp[i].v > v_max) v_max = img_comp[i].v; + } + + // compute interleaved mcu info + img_h_max = h_max; + img_v_max = v_max; + img_mcu_w = h_max * 8; + img_mcu_h = v_max * 8; + img_mcu_x = (img_x + img_mcu_w-1) / img_mcu_w; + img_mcu_y = (img_y + img_mcu_h-1) / img_mcu_h; + + for (i=0; i < img_n; ++i) { + // number of effective pixels (e.g. for non-interleaved MCU) + img_comp[i].x = (img_x * img_comp[i].h + h_max-1) / h_max; + img_comp[i].y = (img_y * img_comp[i].v + v_max-1) / v_max; + // to simplify generation, we'll allocate enough memory to decode + // the bogus oversized data from using interleaved MCUs and their + // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't + // discard the extra data until colorspace conversion + img_comp[i].w2 = img_mcu_x * img_comp[i].h * 8; + img_comp[i].h2 = img_mcu_y * img_comp[i].v * 8; + img_comp[i].raw_data = malloc(img_comp[i].w2 * img_comp[i].h2+15); + if (img_comp[i].raw_data == NULL) { + for(--i; i >= 0; --i) { + free(img_comp[i].raw_data); + img_comp[i].data = NULL; + } + return e("outofmem", "Out of memory"); + } + img_comp[i].data = (uint8*) (((int) img_comp[i].raw_data + 15) & ~15); + 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(int scan) +{ + int m; + marker = MARKER_none; // initialize cached marker to empty + m = get_marker(); + if (!SOI(m)) return e("no SOI","Corrupt JPEG"); + if (scan == SCAN_type) return 1; + m = get_marker(); + while (!SOF(m)) { + if (!process_marker(m)) return 0; + m = get_marker(); + while (m == MARKER_none) { + // some files have extra padding after their blocks, so ok, we'll scan + if (at_eof()) return e("no SOF", "Corrupt JPEG"); + m = get_marker(); + } + } + if (!process_frame_header(scan)) return 0; + return 1; +} + +static int decode_jpeg_image(void) +{ + int m; + restart_interval = 0; + if (!decode_jpeg_header(SCAN_load)) return 0; + m = get_marker(); + while (!EOI(m)) { + if (SOS(m)) { + if (!process_scan_header()) return 0; + if (!parse_entropy_coded_data()) return 0; + } else { + if (!process_marker(m)) return 0; + } + m = get_marker(); + } + 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) +{ + 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; + 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]; + 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); + 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, uint8 *y, uint8 *pcb, 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; + } +} + +#if 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(void) +{ + int i; + for (i=0; i < img_n; ++i) { + if (img_comp[i].data) { + free(img_comp[i].raw_data); + img_comp[i].data = NULL; + } + if (img_comp[i].linebuf) { + free(img_comp[i].linebuf); + 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(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"); + + // load a jpeg image from whichever source + if (!decode_jpeg_image()) { cleanup_jpeg(); return NULL; } + + // determine actual number of components to generate + n = req_comp ? req_comp : img_n; + + if (img_n == 3 && n < 3) + decode_n = 1; + else + decode_n = 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 + img_comp[k].linebuf = (uint8 *) malloc(img_x + 3); + if (!img_comp[k].linebuf) { cleanup_jpeg(); return epuc("outofmem", "Out of memory"); } + + r->hs = img_h_max / img_comp[k].h; + r->vs = img_v_max / img_comp[k].v; + r->ystep = r->vs >> 1; + r->w_lores = (img_x + r->hs-1) / r->hs; + r->ypos = 0; + r->line0 = r->line1 = 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 * img_x * img_y + 1); + if (!output) { cleanup_jpeg(); return epuc("outofmem", "Out of memory"); } + + // now go ahead and resample + for (j=0; j < img_y; ++j) { + uint8 *out = output + n * 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(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 < img_comp[k].y) + r->line1 += img_comp[k].w2; + } + } + if (n >= 3) { + uint8 *y = coutput[0]; + if (img_n == 3) { + #if STBI_SIMD + stbi_YCbCr_installed(out, y, coutput[1], coutput[2], img_x, n); + #else + YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], img_x, n); + #endif + } else + for (i=0; i < 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 < img_x; ++i) out[i] = y[i]; + else + for (i=0; i < img_x; ++i) *out++ = y[i], *out++ = 255; + } + } + cleanup_jpeg(); + *out_x = img_x; + *out_y = img_y; + if (comp) *comp = img_n; // report original components, not output + return output; + } +} + +#ifndef STBI_NO_STDIO +unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + start_file(f); + return load_jpeg_image(x,y,comp,req_comp); +} + +unsigned char *stbi_jpeg_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *data; + FILE *f = fopen(filename, "rb"); + if (!f) return NULL; + data = stbi_jpeg_load_from_file(f,x,y,comp,req_comp); + fclose(f); + return data; +} +#endif + +unsigned char *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + start_mem(buffer,len); + return load_jpeg_image(x,y,comp,req_comp); +} + +#ifndef STBI_NO_STDIO +int stbi_jpeg_test_file(FILE *f) +{ + int n,r; + n = ftell(f); + start_file(f); + r = decode_jpeg_header(SCAN_type); + fseek(f,n,SEEK_SET); + return r; +} +#endif + +int stbi_jpeg_test_memory(stbi_uc const *buffer, int len) +{ + start_mem(buffer,len); + return decode_jpeg_header(SCAN_type); +} + +// @TODO: +#ifndef STBI_NO_STDIO +extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); +extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); +#endif +extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *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; + +__forceinline 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; +} + +__forceinline 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 + +static uint8 *zbuffer, *zbuffer_end; + +__forceinline static int zget8(void) +{ + if (zbuffer >= zbuffer_end) return 0; + return *zbuffer++; +} + +//static uint32 code_buffer; +static int num_bits; + +static void fill_bits(void) +{ + do { + assert(code_buffer < (1U << num_bits)); + code_buffer |= zget8() << num_bits; + num_bits += 8; + } while (num_bits <= 24); +} + +__forceinline static unsigned int zreceive(int n) +{ + unsigned int k; + if (num_bits < n) fill_bits(); + k = code_buffer & ((1 << n) - 1); + code_buffer >>= n; + num_bits -= n; + return k; +} + +__forceinline static int zhuffman_decode(zhuffman *z) +{ + int b,s,k; + if (num_bits < 16) fill_bits(); + b = z->fast[code_buffer & ZFAST_MASK]; + if (b < 0xffff) { + s = z->size[b]; + code_buffer >>= s; + 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(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); + code_buffer >>= s; + num_bits -= s; + return z->value[b]; +} + +static char *zout; +static char *zout_start; +static char *zout_end; +static int z_expandable; + +static int expand(int n) // need to make room for n bytes +{ + char *q; + int cur, limit; + if (!z_expandable) return e("output buffer limit","Corrupt PNG"); + cur = (int) (zout - zout_start); + limit = (int) (zout_end - zout_start); + while (cur + n > limit) + limit *= 2; + q = (char *) realloc(zout_start, limit); + if (q == NULL) return e("outofmem", "Out of memory"); + zout_start = q; + zout = q + cur; + zout_end = q + limit; + return 1; +} + +static zhuffman z_length, z_distance; + +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(void) +{ + for(;;) { + int z = zhuffman_decode(&z_length); + if (z < 256) { + if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes + if (zout >= zout_end) if (!expand(1)) return 0; + *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(length_extra[z]); + z = zhuffman_decode(&z_distance); + if (z < 0) return e("bad huffman code","Corrupt PNG"); + dist = dist_base[z]; + if (dist_extra[z]) dist += zreceive(dist_extra[z]); + if (zout - zout_start < dist) return e("bad dist","Corrupt PNG"); + if (zout + len > zout_end) if (!expand(len)) return 0; + p = (uint8 *) (zout - dist); + while (len--) + *zout++ = *p++; + } + } +} + +static int compute_huffman_codes(void) +{ + static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; + static zhuffman z_codelength; // static just to save stack space + uint8 lencodes[286+32+137];//padding for maximum single op + uint8 codelength_sizes[19]; + int i,n; + + int hlit = zreceive(5) + 257; + int hdist = zreceive(5) + 1; + int hclen = zreceive(4) + 4; + + memset(codelength_sizes, 0, sizeof(codelength_sizes)); + for (i=0; i < hclen; ++i) { + int s = zreceive(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(&z_codelength); + assert(c >= 0 && c < 19); + if (c < 16) + lencodes[n++] = (uint8) c; + else if (c == 16) { + c = zreceive(2)+3; + memset(lencodes+n, lencodes[n-1], c); + n += c; + } else if (c == 17) { + c = zreceive(3)+3; + memset(lencodes+n, 0, c); + n += c; + } else { + assert(c == 18); + c = zreceive(7)+11; + memset(lencodes+n, 0, c); + n += c; + } + } + if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG"); + if (!zbuild_huffman(&z_length, lencodes, hlit)) return 0; + if (!zbuild_huffman(&z_distance, lencodes+hlit, hdist)) return 0; + return 1; +} + +static int parse_uncompressed_block(void) +{ + uint8 header[4]; + int len,nlen,k; + if (num_bits & 7) + zreceive(num_bits & 7); // discard + // drain the bit-packed data into header + k = 0; + while (num_bits > 0) { + header[k++] = (uint8) (code_buffer & 255); // wtf this warns? + code_buffer >>= 8; + num_bits -= 8; + } + assert(num_bits == 0); + // now fill header the normal way + while (k < 4) + header[k++] = (uint8) zget8(); + len = header[1] * 256 + header[0]; + nlen = header[3] * 256 + header[2]; + if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG"); + if (zbuffer + len > zbuffer_end) return e("read past buffer","Corrupt PNG"); + if (zout + len > zout_end) + if (!expand(len)) return 0; + memcpy(zout, zbuffer, len); + zbuffer += len; + zout += len; + return 1; +} + +static int parse_zlib_header(void) +{ + int cmf = zget8(); + int cm = cmf & 15; + /* int cinfo = cmf >> 4; */ + int flg = zget8(); + 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; +} + +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; +} + +static int parse_zlib(int parse_header) +{ + int final, type; + if (parse_header) + if (!parse_zlib_header()) return 0; + num_bits = 0; + code_buffer = 0; + do { + final = zreceive(1); + type = zreceive(2); + if (type == 0) { + if (!parse_uncompressed_block()) return 0; + } else if (type == 3) { + return 0; + } else { + if (type == 1) { + // use fixed code lengths + if (!default_length[0]) init_defaults(); + if (!zbuild_huffman(&z_length , default_length , 288)) return 0; + if (!zbuild_huffman(&z_distance, default_distance, 32)) return 0; + } else { + if (!compute_huffman_codes()) return 0; + } + if (!parse_huffman_block()) return 0; + } + } while (!final); + return 1; +} + +static int do_zlib(char *obuf, int olen, int exp, int parse_header) +{ + zout_start = obuf; + zout = obuf; + zout_end = obuf + olen; + z_expandable = exp; + + return parse_zlib(parse_header); +} + +char *stbi_zlib_decode_malloc_guesssize(int initial_size, int *outlen) +{ + char *p = (char *) malloc(initial_size); + if (p == NULL) return NULL; + if (do_zlib(p, initial_size, 1, 1)) { + *outlen = (int) (zout - zout_start); + return zout_start; + } else { + free(zout_start); + return NULL; + } +} + +char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) +{ + zbuffer = (uint8 *) buffer; + zbuffer_end = (uint8 *) buffer+len; + return stbi_zlib_decode_malloc_guesssize(16384, outlen); +} + +int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) +{ + zbuffer = (uint8 *) ibuffer; + zbuffer_end = (uint8 *) ibuffer + ilen; + if (do_zlib(obuffer, olen, 0, 1)) + return (int) (zout - zout_start); + else + return -1; +} + +char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen) +{ + char *p = (char *) malloc(16384); + if (p == NULL) return NULL; + zbuffer = (uint8 *) buffer; + zbuffer_end = (uint8 *) buffer+len; + if (do_zlib(p, 16384, 1, 0)) { + *outlen = (int) (zout - zout_start); + return zout_start; + } else { + free(zout_start); + return NULL; + } +} + +int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen) +{ + zbuffer = (uint8 *) ibuffer; + zbuffer_end = (uint8 *) ibuffer + ilen; + if (do_zlib(obuffer, olen, 0, 0)) + return (int) (zout - 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(void) +{ + chunk c; + c.length = get32(); + c.type = get32(); + return c; +} + +static int check_png_header(void) +{ + static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 }; + int i; + for (i=0; i < 8; ++i) + if (get8() != png_sig[i]) return e("bad png sig","Not a PNG"); + return 1; +} + +static uint8 *idata, *expanded, *out; + +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(uint8 *raw, uint32 raw_len, int out_n) +{ + uint32 i,j,stride = img_x*out_n; + int k; + assert(out_n == img_n || out_n == img_n+1); + out = (uint8 *) malloc(img_x * img_y * out_n); + if (!out) return e("outofmem", "Out of memory"); + if (raw_len != (img_n * img_x + 1) * img_y) return e("not enough pixels","Corrupt PNG"); + for (j=0; j < img_y; ++j) { + uint8 *cur = 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=1; i < img_x; ++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=1; i < img_x; ++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 compute_transparency(uint8 tc[3], int out_n) +{ + uint32 i, pixel_count = img_x * img_y; + uint8 *p = 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); + + p = out; + 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(uint8 *palette, int len, int pal_img_n) +{ + uint32 i, pixel_count = img_x * img_y; + uint8 *p, *temp_out, *orig = 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(out); + out = temp_out; + return 1; +} + +static int parse_png_file(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; + + if (!check_png_header()) return 0; + + if (scan == SCAN_type) return 1; + + for(;;first=0) { + chunk c = get_chunk_header(); + if (first && c.type != PNG_TYPE('I','H','D','R')) + return e("first not IHDR","Corrupt PNG"); + switch (c.type) { + case PNG_TYPE('I','H','D','R'): { + int depth,color,interlace,comp,filter; + if (!first) return e("multiple IHDR","Corrupt PNG"); + if (c.length != 13) return e("bad IHDR len","Corrupt PNG"); + img_x = get32(); if (img_x > (1 << 24)) return e("too large","Very large image (corrupt?)"); + img_y = get32(); if (img_y > (1 << 24)) return e("too large","Very large image (corrupt?)"); + depth = get8(); if (depth != 8) return e("8bit only","PNG not supported: 8-bit only"); + color = get8(); 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(); if (comp) return e("bad comp method","Corrupt PNG"); + filter= get8(); if (filter) return e("bad filter method","Corrupt PNG"); + interlace = get8(); if (interlace) return e("interlaced","PNG not supported: interlaced mode"); + if (!img_x || !img_y) return e("0-pixel image","Corrupt PNG"); + if (!pal_img_n) { + img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); + if ((1 << 30) / img_x / img_n < 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. + img_n = 1; + if ((1 << 30) / img_x / 4 < 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 (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(); + palette[i*4+1] = get8u(); + palette[i*4+2] = get8u(); + palette[i*4+3] = 255; + } + break; + } + + case PNG_TYPE('t','R','N','S'): { + if (idata) return e("tRNS after IDAT","Corrupt PNG"); + if (pal_img_n) { + if (scan == SCAN_header) { 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(); + } else { + if (!(img_n & 1)) return e("tRNS with alpha","Corrupt PNG"); + if (c.length != (uint32) img_n*2) return e("bad tRNS len","Corrupt PNG"); + has_trans = 1; + for (k=0; k < img_n; ++k) + tc[k] = (uint8) get16(); // non 8-bit images will be larger + } + break; + } + + case PNG_TYPE('I','D','A','T'): { + if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG"); + if (scan == SCAN_header) { 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(idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory"); + idata = p; + } + #ifndef STBI_NO_STDIO + if (img_file) + { + if (fread(idata+ioff,1,c.length,img_file) != c.length) return e("outofdata","Corrupt PNG"); + } + else + #endif + { + memcpy(idata+ioff, img_buffer, c.length); + img_buffer += c.length; + } + ioff += c.length; + break; + } + + case PNG_TYPE('I','E','N','D'): { + uint32 raw_len; + if (scan != SCAN_load) return 1; + if (idata == NULL) return e("no IDAT","Corrupt PNG"); + expanded = (uint8 *) stbi_zlib_decode_malloc((char *) idata, ioff, (int *) &raw_len); + if (expanded == NULL) return 0; // zlib should set error + free(idata); idata = NULL; + if ((req_comp == img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) + img_out_n = img_n+1; + else + img_out_n = img_n; + if (!create_png_image(expanded, raw_len, img_out_n)) return 0; + if (has_trans) + if (!compute_transparency(tc, img_out_n)) return 0; + if (pal_img_n) { + // pal_img_n == 3 or 4 + img_n = pal_img_n; // record the actual colors we had + img_out_n = pal_img_n; + if (req_comp >= 3) img_out_n = req_comp; + if (!expand_palette(palette, pal_len, img_out_n)) + return 0; + } + free(expanded); expanded = NULL; + return 1; + } + + default: + // if critical, fail + if ((c.type & (1 << 29)) == 0) { + #ifndef STBI_NO_FAILURE_STRINGS + 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(c.length); + break; + } + // end of chunk, read and skip CRC + get8(); get8(); get8(); get8(); + } +} + +static unsigned char *do_png(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(SCAN_load, req_comp)) { + result = out; + out = NULL; + if (req_comp && req_comp != img_out_n) { + result = convert_format(result, img_out_n, req_comp); + if (result == NULL) return result; + } + *x = img_x; + *y = img_y; + if (n) *n = img_n; + } + free(out); out = NULL; + free(expanded); expanded = NULL; + free(idata); idata = NULL; + + return result; +} + +#ifndef STBI_NO_STDIO +unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + start_file(f); + return do_png(x,y,comp,req_comp); +} + +unsigned char *stbi_png_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + unsigned char *data; + FILE *f = fopen(filename, "rb"); + if (!f) return NULL; + data = stbi_png_load_from_file(f,x,y,comp,req_comp); + fclose(f); + return data; +} +#endif + +unsigned char *stbi_png_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + start_mem(buffer,len); + return do_png(x,y,comp,req_comp); +} + +#ifndef STBI_NO_STDIO +int stbi_png_test_file(FILE *f) +{ + int n,r; + n = ftell(f); + start_file(f); + r = parse_png_file(SCAN_type,STBI_default); + fseek(f,n,SEEK_SET); + return r; +} +#endif + +int stbi_png_test_memory(stbi_uc const *buffer, int len) +{ + start_mem(buffer, len); + return parse_png_file(SCAN_type,STBI_default); +} + +// TODO: load header from png +#ifndef STBI_NO_STDIO +extern int stbi_png_info (char const *filename, int *x, int *y, int *comp); +extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); +#endif +extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); + +// Microsoft/Windows BMP image + +static int bmp_test(void) +{ + int sz; + if (get8() != 'B') return 0; + if (get8() != 'M') return 0; + get32le(); // discard filesize + get16le(); // discard reserved + get16le(); // discard reserved + get32le(); // discard data offset + sz = get32le(); + if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1; + return 0; +} + +#ifndef STBI_NO_STDIO +int stbi_bmp_test_file (FILE *f) +{ + int r,n = ftell(f); + start_file(f); + r = bmp_test(); + fseek(f,n,SEEK_SET); + return r; +} +#endif + +int stbi_bmp_test_memory (stbi_uc const *buffer, int len) +{ + start_mem(buffer, len); + return bmp_test(); +} + +// 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(int *x, int *y, int *comp, int req_comp) +{ + 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() != 'B' || get8() != 'M') return epuc("not BMP", "Corrupt BMP"); + get32le(); // discard filesize + get16le(); // discard reserved + get16le(); // discard reserved + offset = get32le(); + hsz = get32le(); + if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown"); + failure_reason = "bad BMP"; + if (hsz == 12) { + img_x = get16le(); + img_y = get16le(); + } else { + img_x = get32le(); + img_y = get32le(); + } + if (get16le() != 1) return 0; + bpp = get16le(); + if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit"); + flip_vertically = ((int) img_y) > 0; + img_y = abs((int) img_y); + if (hsz == 12) { + if (bpp < 24) + psize = (offset - 14 - 24) / 3; + } else { + compress = get32le(); + if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE"); + get32le(); // discard sizeof + get32le(); // discard hres + get32le(); // discard vres + get32le(); // discard colorsused + get32le(); // discard max important + if (hsz == 40 || hsz == 56) { + if (hsz == 56) { + get32le(); + get32le(); + get32le(); + get32le(); + } + if (bpp == 16 || bpp == 32) { + mr = mg = mb = 0; + if (compress == 0) { + if (bpp == 32) { + mr = 0xff << 16; + mg = 0xff << 8; + mb = 0xff << 0; + } else { + mr = 31 << 10; + mg = 31 << 5; + mb = 31 << 0; + } + } else if (compress == 3) { + mr = get32le(); + mg = get32le(); + mb = get32le(); + // not documented, but generated by photoshop and handled by mspaint + if (mr == mg && mg == mb) { + // ?!?!? + return NULL; + } + } else + return NULL; + } + } else { + assert(hsz == 108); + mr = get32le(); + mg = get32le(); + mb = get32le(); + ma = get32le(); + get32le(); // discard color space + for (i=0; i < 12; ++i) + get32le(); // discard color space parameters + } + if (bpp < 16) + psize = (offset - 14 - hsz) >> 2; + } + img_n = ma ? 4 : 3; + if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 + target = req_comp; + else + target = img_n; // if they want monochrome, we'll post-convert + out = (stbi_uc *) malloc(target * img_x * img_y); + if (!out) return epuc("outofmem", "Out of memory"); + if (bpp < 16) { + int z=0; + if (psize == 0 || psize > 256) return epuc("invalid", "Corrupt BMP"); + for (i=0; i < psize; ++i) { + pal[i][2] = get8(); + pal[i][1] = get8(); + pal[i][0] = get8(); + if (hsz != 12) get8(); + pal[i][3] = 255; + } + skip(offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4)); + if (bpp == 4) width = (img_x + 1) >> 1; + else if (bpp == 8) width = img_x; + else return epuc("bad bpp", "Corrupt BMP"); + pad = (-width)&3; + for (j=0; j < (int) img_y; ++j) { + for (i=0; i < (int) img_x; i += 2) { + int v=get8(),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) img_x) break; + v = (bpp == 8) ? get8() : v2; + out[z++] = pal[v][0]; + out[z++] = pal[v][1]; + out[z++] = pal[v][2]; + if (target == 4) out[z++] = 255; + } + skip(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(offset - 14 - hsz); + if (bpp == 24) width = 3 * img_x; + else if (bpp == 16) width = 2*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 == 0xff000000 && ma == 0xff000000) + easy = 2; + } + if (!easy) { + if (!mr || !mg || !mb) 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) img_y; ++j) { + if (easy) { + for (i=0; i < (int) img_x; ++i) { + int a; + out[z+2] = get8(); + out[z+1] = get8(); + out[z+0] = get8(); + z += 3; + a = (easy == 2 ? get8() : 255); + if (target == 4) out[z++] = a; + } + } else { + for (i=0; i < (int) img_x; ++i) { + uint32 v = (bpp == 16 ? get16le() : get32le()); + int a; + out[z++] = shiftsigned(v & mr, rshift, rcount); + out[z++] = shiftsigned(v & mg, gshift, gcount); + out[z++] = shiftsigned(v & mb, bshift, bcount); + a = (ma ? shiftsigned(v & ma, ashift, acount) : 255); + if (target == 4) out[z++] = a; + } + } + skip(pad); + } + } + if (flip_vertically) { + stbi_uc t; + for (j=0; j < (int) img_y>>1; ++j) { + stbi_uc *p1 = out + j *img_x*target; + stbi_uc *p2 = out + (img_y-1-j)*img_x*target; + for (i=0; i < (int) 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); + if (out == NULL) return out; // convert_format frees input on failure + } + + *x = img_x; + *y = img_y; + if (comp) *comp = target; + return out; +} + +#ifndef STBI_NO_STDIO +stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp) +{ + stbi_uc *data; + FILE *f = fopen(filename, "rb"); + if (!f) return NULL; + data = stbi_bmp_load_from_file(f, x,y,comp,req_comp); + fclose(f); + return data; +} + +stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) +{ + start_file(f); + return bmp_load(x,y,comp,req_comp); +} +#endif + +stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + start_mem(buffer, len); + return bmp_load(x,y,comp,req_comp); +} + +// Targa Truevision - TGA +// by Jonathan Dummer + +static int tga_test(void) +{ + int sz; + get8u(); // discard Offset + sz = get8u(); // color type + if( sz > 1 ) return 0; // only RGB or indexed allowed + sz = get8u(); // image type + if( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE + get16(); // discard palette start + get16(); // discard palette length + get8(); // discard bits per palette color entry + get16(); // discard x origin + get16(); // discard y origin + if( get16() < 1 ) return 0; // test width + if( get16() < 1 ) return 0; // test height + sz = get8(); // 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 +} + +#ifndef STBI_NO_STDIO +int stbi_tga_test_file (FILE *f) +{ + int r,n = ftell(f); + start_file(f); + r = tga_test(); + fseek(f,n,SEEK_SET); + return r; +} +#endif + +int stbi_tga_test_memory (stbi_uc const *buffer, int len) +{ + start_mem(buffer, len); + return tga_test(); +} + +static stbi_uc *tga_load(int *x, int *y, int *comp, int req_comp) +{ + // read in the TGA header stuff + int tga_offset = get8u(); + int tga_indexed = get8u(); + int tga_image_type = get8u(); + int tga_is_RLE = 0; + int tga_palette_start = get16le(); + int tga_palette_len = get16le(); + int tga_palette_bits = get8u(); + int tga_x_origin = get16le(); + int tga_y_origin = get16le(); + int tga_width = get16le(); + int tga_height = get16le(); + int tga_bits_per_pixel = get8u(); + int tga_inverted = get8u(); + // 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; + } + + // 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 ); + + // skip to the data's starting position (offset usually = 0) + skip( tga_offset ); + // do I need to load a palette? + if( tga_indexed ) + { + // any data to skip? (offset usually = 0) + skip( tga_palette_start ); + // load the palette + tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 ); + getn( tga_palette, tga_palette_len * tga_palette_bits / 8 ); + } + // 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 chunk? + if( tga_is_RLE ) + { + if( RLE_count == 0 ) + { + // yep, get the next byte as a RLE command + int RLE_cmd = get8u(); + 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(); + 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(); + } + } + // 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; +} + +#ifndef STBI_NO_STDIO +stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp) +{ + stbi_uc *data; + FILE *f = fopen(filename, "rb"); + if (!f) return NULL; + data = stbi_tga_load_from_file(f, x,y,comp,req_comp); + fclose(f); + return data; +} + +stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) +{ + start_file(f); + return tga_load(x,y,comp,req_comp); +} +#endif + +stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + start_mem(buffer, len); + return tga_load(x,y,comp,req_comp); +} + + +// ************************************************************************************************* +// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicholas Schulz, tweaked by STB + +static int psd_test(void) +{ + if (get32() != 0x38425053) return 0; // "8BPS" + else return 1; +} + +#ifndef STBI_NO_STDIO +int stbi_psd_test_file(FILE *f) +{ + int r,n = ftell(f); + start_file(f); + r = psd_test(); + fseek(f,n,SEEK_SET); + return r; +} +#endif + +int stbi_psd_test_memory(stbi_uc const *buffer, int len) +{ + start_mem(buffer, len); + return psd_test(); +} + +static stbi_uc *psd_load(int *x, int *y, int *comp, int req_comp) +{ + int pixelCount; + int channelCount, compression; + int channel, i, count, len; + int w,h; + + // Check identifier + if (get32() != 0x38425053) // "8BPS" + return epuc("not PSD", "Corrupt PSD image"); + + // Check file type version. + if (get16() != 1) + return epuc("wrong version", "Unsupported version of PSD image"); + + // Skip 6 reserved bytes. + skip( 6 ); + + // Read the number of channels (R, G, B, A, etc). + channelCount = get16(); + 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(); + w = get32(); + + // Make sure the depth is 8 bits. + if (get16() != 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() != 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(get32() ); + + // Skip the image resources. (resolution, pen tool paths, etc) + skip( get32() ); + + // Skip the reserved data. + skip( get32() ); + + // Find out if the data is compressed. + // Known values: + // 0: no compression + // 1: RLE compressed + compression = get16(); + if (compression > 1) + return epuc("unknown compression type", "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( 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(); + if (len == 128) { + // No-op. + } else if (len < 128) { + // Copy next len+1 bytes literally. + len++; + count += len; + while (len) { + *p = get8(); + p += 4; + len--; + } + } else if (len > 128) { + uint32 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 = get8(); + 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. + count = 0; + for (i = 0; i < pixelCount; i++) + *p = get8(), p += 4; + } + } + } + + if (req_comp && req_comp != 4) { + img_x = w; + img_y = h; + out = convert_format(out, 4, req_comp); + if (out == NULL) return out; // convert_format frees input on failure + } + + if (comp) *comp = channelCount; + *y = h; + *x = w; + + return out; +} + +#ifndef STBI_NO_STDIO +stbi_uc *stbi_psd_load(char const *filename, int *x, int *y, int *comp, int req_comp) +{ + stbi_uc *data; + FILE *f = fopen(filename, "rb"); + if (!f) return NULL; + data = stbi_psd_load_from_file(f, x,y,comp,req_comp); + fclose(f); + return data; +} + +stbi_uc *stbi_psd_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + start_file(f); + return psd_load(x,y,comp,req_comp); +} +#endif + +stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + start_mem(buffer, len); + return psd_load(x,y,comp,req_comp); +} + + +// ************************************************************************************************* +// Radiance RGBE HDR loader +// originally by Nicolas Schulz +#ifndef STBI_NO_HDR +static int hdr_test(void) +{ + char *signature = "#?RADIANCE\n"; + int i; + for (i=0; signature[i]; ++i) + if (get8() != signature[i]) + return 0; + return 1; +} + +int stbi_hdr_test_memory(stbi_uc const *buffer, int len) +{ + start_mem(buffer, len); + return hdr_test(); +} + +#ifndef STBI_NO_STDIO +int stbi_hdr_test_file(FILE *f) +{ + int r,n = ftell(f); + start_file(f); + r = hdr_test(); + fseek(f,n,SEEK_SET); + return r; +} +#endif + +#define HDR_BUFLEN 1024 +static char *hdr_gettoken(char *buffer) +{ + int len=0; + char *s = buffer, c = '\0'; + + c = get8(); + + while (!at_eof() && c != '\n') { + buffer[len++] = c; + if (len == HDR_BUFLEN-1) { + // flush to end of line + while (!at_eof() && get8() != '\n') + ; + break; + } + c = get8(); + } + + 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(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(buffer), "#?RADIANCE") != 0) + return epf("not HDR", "Corrupt HDR image"); + + // Parse header + while(1) { + token = hdr_gettoken(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(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(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(); + c2 = get8(); + len = get8(); + 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] = { c1,c2,len, get8() }; + hdr_convert(hdr_data, rgbe, req_comp); + i = 1; + j = 0; + free(scanline); + goto main_decode_loop; // yes, this is fucking insane; blame the fucking insane format + } + len <<= 8; + len |= get8(); + 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 = get8(); + if (count > 128) { + // Run + value = get8(); + 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] = get8(); + } + } + } + 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; +} + +#ifndef STBI_NO_STDIO +float *stbi_hdr_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) +{ + start_file(f); + return hdr_load(x,y,comp,req_comp); +} +#endif + +float *stbi_hdr_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) +{ + start_mem(buffer, len); + return hdr_load(x,y,comp,req_comp); +} + +#endif // STBI_NO_HDR + +/////////////////////// write image /////////////////////// + +#ifndef STBI_NO_WRITE + +static void write8(FILE *f, int x) { uint8 z = (uint8) x; fwrite(&z,1,1,f); } + +static void writefv(FILE *f, char *fmt, va_list v) +{ + while (*fmt) { + switch (*fmt++) { + case ' ': break; + case '1': { uint8 x = va_arg(v, int); write8(f,x); break; } + case '2': { int16 x = va_arg(v, int); write8(f,x); write8(f,x>>8); break; } + case '4': { int32 x = va_arg(v, int); write8(f,x); write8(f,x>>8); write8(f,x>>16); write8(f,x>>24); break; } + default: + assert(0); + va_end(v); + return; + } + } +} + +static void writef(FILE *f, char *fmt, ...) +{ + va_list v; + va_start(v, fmt); + writefv(f,fmt,v); + va_end(v); +} + +static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad) +{ + uint8 bg[3] = { 255, 0, 255}, px[3]; + uint32 zero = 0; + int i,j,k, j_end; + + if (vdir < 0) + j_end = -1, j = y-1; + else + j_end = y, j = 0; + + for (; j != j_end; j += vdir) { + for (i=0; i < x; ++i) { + uint8 *d = (uint8 *) data + (j*x+i)*comp; + if (write_alpha < 0) + fwrite(&d[comp-1], 1, 1, f); + switch (comp) { + case 1: + case 2: writef(f, "111", d[0],d[0],d[0]); + break; + case 4: + if (!write_alpha) { + for (k=0; k < 3; ++k) + px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255; + writef(f, "111", px[1-rgb_dir],px[1],px[1+rgb_dir]); + break; + } + /* FALLTHROUGH */ + case 3: + writef(f, "111", d[1-rgb_dir],d[1],d[1+rgb_dir]); + break; + } + if (write_alpha > 0) + fwrite(&d[comp-1], 1, 1, f); + } + fwrite(&zero,scanline_pad,1,f); + } +} + +static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, char *fmt, ...) +{ + FILE *f = fopen(filename, "wb"); + if (f) { + va_list v; + va_start(v, fmt); + writefv(f, fmt, v); + va_end(v); + write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad); + fclose(f); + } + return f != NULL; +} + +int stbi_write_bmp(char const *filename, int x, int y, int comp, void *data) +{ + int pad = (-x*3) & 3; + return outfile(filename,-1,-1,x,y,comp,data,0,pad, + "11 4 22 4" "4 44 22 444444", + 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header + 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header +} + +int stbi_write_tga(char const *filename, int x, int y, int comp, void *data) +{ + int has_alpha = !(comp & 1); + return outfile(filename, -1,-1, x, y, comp, data, has_alpha, 0, + "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha); +} + +// any other image formats that do interleaved rgb data? +// PNG: requires adler32,crc32 -- significant amount of code +// PSD: no, channels output separately +// TIFF: no, stripwise-interleaved... i think + +#endif // STBI_NO_WRITE |