summaryrefslogtreecommitdiff
path: root/cogl
diff options
context:
space:
mode:
authorRui Matos <tiagomatos@gmail.com>2016-04-11 17:52:46 +0200
committerRui Matos <tiagomatos@gmail.com>2016-04-22 16:39:46 +0200
commit26c94951fc97242d8494f7594e21c20a984eb064 (patch)
tree451b52e9c9741e5cc4427a766f5d63e5cc6fdf0c /cogl
parent9504eac68cb5231c304cb71e0ae22bfc7ddc5ccf (diff)
downloadmutter-26c94951fc97242d8494f7594e21c20a984eb064.tar.gz
disable standalone builds and drop private glib copy
Diffstat (limited to 'cogl')
-rw-r--r--cogl/Makefile.am12
-rw-r--r--cogl/cogl-bitmap-pixbuf.c152
-rw-r--r--cogl/stb_image.c3892
3 files changed, 0 insertions, 4056 deletions
diff --git a/cogl/Makefile.am b/cogl/Makefile.am
index 703bedd82..be0b47b1f 100644
--- a/cogl/Makefile.am
+++ b/cogl/Makefile.am
@@ -25,10 +25,6 @@ AM_CPPFLAGS = \
-I$(srcdir)/driver/gl/gles \
$(NULL)
-if !USE_GLIB
- AM_CPPFLAGS += -I$(top_builddir)/deps/glib
-endif
-
AM_CPPFLAGS += \
-DG_LOG_DOMAIN=\"Cogl\" \
-DCOGL_COMPILATION \
@@ -418,10 +414,8 @@ cogl_sources_c = \
deprecated/cogl-texture-deprecated.c \
$(NULL)
-if USE_GLIB
cogl_experimental_h += cogl-glib-source.h
cogl_sources_c += cogl-glib-source.c
-endif
if SUPPORT_XLIB
cogl_deprecated_h += deprecated/cogl-clutter-xlib.h
@@ -476,8 +470,6 @@ cogl_sources_c += \
winsys/cogl-winsys-egl-private.h
endif
-EXTRA_DIST += stb_image.c
-
# glib-mkenums rules
glib_enum_h = cogl-enum-types.h
glib_enum_c = cogl-enum-types.c
@@ -487,10 +479,6 @@ include $(top_srcdir)/build/autotools/Makefile.am.enums
lib_LTLIBRARIES += libcogl.la
libcogl_la_LIBADD = $(LIBM) $(COGL_DEP_LIBS) $(COGL_EXTRA_LDFLAGS)
-if !USE_GLIB
-libcogl_la_LIBADD += $(top_builddir)/deps/glib/libglib.la
-libcogl_la_LIBADD += $(top_builddir)/deps/gmodule/libgmodule.la
-endif
if UNIT_TESTS
libcogl_la_LIBADD += $(top_builddir)/test-fixtures/libtest-fixtures.la
endif
diff --git a/cogl/cogl-bitmap-pixbuf.c b/cogl/cogl-bitmap-pixbuf.c
index cccc1cbed..9696de6ec 100644
--- a/cogl/cogl-bitmap-pixbuf.c
+++ b/cogl/cogl-bitmap-pixbuf.c
@@ -40,7 +40,6 @@
#include <string.h>
-#if defined(USE_GDKPIXBUF)
#include <gdk-pixbuf/gdk-pixbuf.h>
CoglBool
@@ -135,154 +134,3 @@ _cogl_bitmap_from_file (CoglContext *ctx,
return bmp;
}
-
-#else
-
-#include "stb_image.c"
-
-CoglBool
-_cogl_bitmap_get_size_from_file (const char *filename,
- int *width,
- int *height)
-{
- if (width)
- *width = 0;
-
- if (height)
- *height = 0;
-
- return TRUE;
-}
-
-/* stb_image.c supports an STBI_grey_alpha format which we don't have
- * a corresponding CoglPixelFormat for so as a special case we
- * convert this to rgba8888.
- *
- * If we have a use case where this is an important format to consider
- * then it could be worth adding a corresponding CoglPixelFormat
- * instead.
- */
-static uint8_t *
-convert_ra_88_to_rgba_8888 (uint8_t *pixels,
- int width,
- int height)
-{
- int x, y;
- uint8_t *buf;
- size_t in_stride = width * 2;
- size_t out_stride = width * 4;
-
- buf = malloc (width * height * 4);
- if (buf)
- return NULL;
-
- for (y = 0; y < height; y++)
- for (x = 0; x < width; x++)
- {
- uint8_t *src = pixels + in_stride * y + 2 * x;
- uint8_t *dst = buf + out_stride * y + 4 * x;
-
- dst[0] = src[0];
- dst[1] = src[0];
- dst[2] = src[0];
- dst[3] = src[1];
- }
-
- return buf;
-}
-
-static CoglBitmap *
-_cogl_bitmap_new_from_stb_pixels (CoglContext *ctx,
- uint8_t *pixels,
- int stb_pixel_format,
- int width,
- int height,
- CoglError **error)
-{
- static CoglUserDataKey bitmap_data_key;
- CoglBitmap *bmp;
- CoglPixelFormat cogl_format;
- size_t stride;
-
- if (pixels == NULL)
- {
- _cogl_set_error_literal (error,
- COGL_BITMAP_ERROR,
- COGL_BITMAP_ERROR_FAILED,
- "Failed to load image with stb image library");
- return NULL;
- }
-
- switch (stb_pixel_format)
- {
- case STBI_grey:
- cogl_format = COGL_PIXEL_FORMAT_A_8;
- break;
- case STBI_grey_alpha:
- {
- uint8_t *tmp = pixels;
-
- pixels = convert_ra_88_to_rgba_8888 (pixels, width, height);
- free (tmp);
-
- if (!pixels)
- {
- _cogl_set_error_literal (error,
- COGL_BITMAP_ERROR,
- COGL_BITMAP_ERROR_FAILED,
- "Failed to alloc memory to convert "
- "gray_alpha to rgba8888");
- return NULL;
- }
-
- cogl_format = COGL_PIXEL_FORMAT_RGBA_8888;
- break;
- }
- case STBI_rgb:
- cogl_format = COGL_PIXEL_FORMAT_RGB_888;
- break;
- case STBI_rgb_alpha:
- cogl_format = COGL_PIXEL_FORMAT_RGBA_8888;
- break;
-
- default:
- g_warn_if_reached ();
- return NULL;
- }
-
- stride = width * _cogl_pixel_format_get_bytes_per_pixel (cogl_format);
-
- /* Store bitmap info */
- bmp = cogl_bitmap_new_for_data (ctx,
- width, height,
- cogl_format,
- stride,
- pixels);
-
- /* Register a destroy function so the pixel data will be freed
- automatically when the bitmap object is destroyed */
- cogl_object_set_user_data (COGL_OBJECT (bmp), &bitmap_data_key, pixels, free);
-
- return bmp;
-}
-
-CoglBitmap *
-_cogl_bitmap_from_file (CoglContext *ctx,
- const char *filename,
- CoglError **error)
-{
- int stb_pixel_format;
- int width;
- int height;
- uint8_t *pixels;
-
- pixels = stbi_load (filename,
- &width, &height, &stb_pixel_format,
- STBI_default);
-
- return _cogl_bitmap_new_from_stb_pixels (ctx, pixels, stb_pixel_format,
- width, height,
- error);
-}
-
-#endif
diff --git a/cogl/stb_image.c b/cogl/stb_image.c
deleted file mode 100644
index 861c7512d..000000000
--- a/cogl/stb_image.c
+++ /dev/null
@@ -1,3892 +0,0 @@
-/* stbi-1.18 - 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 8-bit only
- 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:
- 1.18 fix a threading bug (local mutable static)
- 1.17 support interlaced PNG
- 1.16 major bugfix - convert_format converted one too many pixels
- 1.15 initialize some fields for thread safety
- 1.14 fix threadsafe conversion bug; header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
- 1.13 threadsafe
- 1.12 const qualifiers in the API
- 1.11 Support installable IDCT, colorspace conversion routines
- 1.10 Fixes for 64-bit (don't use "unsigned long")
- optimized upsampling by Fabian "ryg" Giesen
- 1.09 Fix format-conversion for PSD code (bad global variables!)
- 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz
- 1.07 attempt to fix C++ warning/errors again
- 1.06 attempt to fix C++ warning/errors again
- 1.05 fix TGA loading to return correct *comp and use good luminance calc
- 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free
- 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR
- 1.02 support for (subset of) HDR files, float interface for preferred access to them
- 1.01 fix bug: possible bug in handling right-side up bmps... not sure
- fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all
- 1.00 interface to zlib that skips zlib header
- 0.99 correct handling of alpha in palette
- 0.98 TGA loader by lonesock; dynamically add loaders (untested)
- 0.97 jpeg errors on too large a file; also catch another malloc failure
- 0.96 fix detection of invalid v value - particleman@mollyrocket forum
- 0.95 during header scan, seek to markers in case of padding
- 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same
- 0.93 handle jpegtran output; verbose errors
- 0.92 read 4,8,16,24,32-bit BMP files of several formats
- 0.91 output 24-bit Windows 3.0 BMP files
- 0.90 fix a few more warnings; bump version number to approach 1.0
- 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd
- 0.60 fix compiling as c++
- 0.59 fix warnings: merge Dave Moore's -Wall fixes
- 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian
- 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less
- than 16 available
- 0.56 fix bug: zlib uncompressed mode len vs. nlen
- 0.55 fix bug: restart_interval not initialized to 0
- 0.54 allow NULL for 'int *comp'
- 0.53 fix bug in png 3->4; speedup png decoding
- 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments
- 0.51 obey req_comp requests, 1-component jpegs return as 1-component,
- on 'test' only check type, not whether we support this variant
-*/
-
-#include <glib.h>
-
-#ifndef STBI_INCLUDE_STB_IMAGE_H
-#define STBI_INCLUDE_STB_IMAGE_H
-
-//// 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
-
-#define STBI_VERSION 1
-
-enum
-{
- STBI_default = 0, // only used for req_comp
-
- STBI_grey = 1,
- STBI_grey_alpha = 2,
- STBI_rgb = 3,
- STBI_rgb_alpha = 4,
-};
-
-typedef unsigned char stbi_uc;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// 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
-// NOT THREADSAFE
-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(const char *buffer, int len, int initial_size, int *outlen);
-extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
-extern int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
-
-extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
-extern int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
-
-// 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
-
-// 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)
-// NOT THREADSAFE
-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_t *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_t *output, uint8_t const *y, uint8_t const *cb, uint8_t const *cr, int count, int step);
-// compute a conversion from YCbCr to RGB
-// 'count' pixels
-// write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
-// y: Y input channel
-// cb: Cb input channel; scale/biased to be 0..255
-// cr: Cr input channel; scale/biased to be 0..255
-
-extern void stbi_install_idct(stbi_idct_8x8 func);
-extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
-#endif // STBI_SIMD
-
-#ifdef __cplusplus
-}
-#endif
-
-//
-//
-//// end header file /////////////////////////////////////////////////////
-#endif // STBI_INCLUDE_STB_IMAGE_H
-
-#ifndef STBI_HEADER_FILE_ONLY
-
-#ifndef STBI_NO_HDR
-#include <math.h> // ldexp
-#include <string.h> // strcmp
-#endif
-
-#ifndef STBI_NO_STDIO
-#include <stdio.h>
-#endif
-#include <stdlib.h>
-#include <memory.h>
-#include <assert.h>
-#include <stdarg.h>
-
-#ifndef _MSC_VER
- #ifdef __cplusplus
- #define __forceinline inline
- #else
- #define __forceinline
- #endif
-#endif
-
-
-// should produce compiler error if size is wrong
-typedef unsigned char validate_uint32_t[sizeof(uint32_t)==4];
-
-#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE)
-#define STBI_NO_WRITE
-#endif
-
-//////////////////////////////////////////////////////////////////////////////
-//
-// Generic API that works on all image types
-//
-
-// this is not threadsafe
-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!
-
-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
-//
-
-enum
-{
- SCAN_load=0,
- SCAN_type,
- SCAN_header,
-};
-
-typedef struct
-{
- uint32_t img_x, img_y;
- int img_n, img_out_n;
-
- #ifndef STBI_NO_STDIO
- FILE *img_file;
- #endif
- uint8_t *img_buffer, *img_buffer_end;
-} stbi;
-
-#ifndef STBI_NO_STDIO
-static void start_file(stbi *s, FILE *f)
-{
- s->img_file = f;
-}
-#endif
-
-static void start_mem(stbi *s, uint8_t const *buffer, int len)
-{
-#ifndef STBI_NO_STDIO
- s->img_file = NULL;
-#endif
- s->img_buffer = (uint8_t *) buffer;
- s->img_buffer_end = (uint8_t *) buffer+len;
-}
-
-__forceinline static int get8(stbi *s)
-{
-#ifndef STBI_NO_STDIO
- if (s->img_file) {
- int c = fgetc(s->img_file);
- return c == EOF ? 0 : c;
- }
-#endif
- if (s->img_buffer < s->img_buffer_end)
- return *s->img_buffer++;
- return 0;
-}
-
-__forceinline static int at_eof(stbi *s)
-{
-#ifndef STBI_NO_STDIO
- if (s->img_file)
- return feof(s->img_file);
-#endif
- return s->img_buffer >= s->img_buffer_end;
-}
-
-__forceinline static uint8_t get8u(stbi *s)
-{
- return (uint8_t) get8(s);
-}
-
-static void skip(stbi *s, int n)
-{
-#ifndef STBI_NO_STDIO
- if (s->img_file)
- fseek(s->img_file, n, SEEK_CUR);
- else
-#endif
- s->img_buffer += n;
-}
-
-static int get16(stbi *s)
-{
- int z = get8(s);
- return (z << 8) + get8(s);
-}
-
-static uint32_t get32(stbi *s)
-{
- uint32_t z = get16(s);
- return (z << 16) + get16(s);
-}
-
-static int get16le(stbi *s)
-{
- int z = get8(s);
- return z + (get8(s) << 8);
-}
-
-static uint32_t get32le(stbi *s)
-{
- uint32_t z = get16le(s);
- return z + (get16le(s) << 16);
-}
-
-static void getn(stbi *s, stbi_uc *buffer, int n)
-{
-#ifndef STBI_NO_STDIO
- if (s->img_file) {
- fread(buffer, 1, n, s->img_file);
- return;
- }
-#endif
- memcpy(buffer, s->img_buffer, n);
- s->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_t compute_y(int r, int g, int b)
-{
- return (uint8_t) (((r*77) + (g*150) + (29*b)) >> 8);
-}
-
-static unsigned char *convert_format(unsigned char *data,
- int img_n,
- int req_comp,
- unsigned int x,
- unsigned int y)
-{
- int i,j;
- unsigned char *good;
-
- if (req_comp == img_n) return data;
- assert(req_comp >= 1 && req_comp <= 4);
-
- good = (unsigned char *) malloc(req_comp * x * y);
- if (good == NULL) {
- free(data);
- return epuc("outofmem", "Out of memory");
- }
-
- for (j=0; j < (int) y; ++j) {
- unsigned char *src = data + j * x * img_n ;
- unsigned char *dest = good + j * x * req_comp;
-
- #define COMBO(a,b) ((a)*8+(b))
- #define CASE(a,b) case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
- // convert source image with img_n components to one with req_comp components;
- // avoid switch per pixel, so use switch per scanline and massive macros
- switch(COMBO(img_n, req_comp)) {
- CASE(1,2) dest[0]=src[0], dest[1]=255; break;
- CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break;
- CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break;
- CASE(2,1) dest[0]=src[0]; break;
- CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break;
- CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break;
- CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break;
- CASE(3,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
- CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
- CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
- CASE(4,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break;
- CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break;
- default: assert(0);
- }
- #undef CASE
- }
-
- free(data);
- return good;
-}
-
-#ifndef STBI_NO_HDR
-static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
-{
- int i,k,n;
- float *output = (float *) malloc(x * y * comp * sizeof(float));
- if (output == NULL) { free(data); return epf("outofmem", "Out of memory"); }
- // compute number of non-alpha components
- if (comp & 1) n = comp; else n = comp-1;
- for (i=0; i < x*y; ++i) {
- for (k=0; k < n; ++k) {
- output[i*comp + k] = (float) pow(data[i*comp+k]/255.0f, l2h_gamma) * l2h_scale;
- }
- if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
- }
- free(data);
- return output;
-}
-
-#define float2int(x) ((int) (x))
-static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp)
-{
- int i,k,n;
- stbi_uc *output = (stbi_uc *) malloc(x * y * comp);
- if (output == NULL) { free(data); return epuc("outofmem", "Out of memory"); }
- // compute number of non-alpha components
- if (comp & 1) n = comp; else n = comp-1;
- for (i=0; i < x*y; ++i) {
- for (k=0; k < n; ++k) {
- float z = (float) pow(data[i*comp+k]*h2l_scale_i, h2l_gamma_i) * 255 + 0.5f;
- if (z < 0) z = 0;
- if (z > 255) z = 255;
- output[i*comp + k] = 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)
-
-// huffman decoding acceleration
-#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
-
-typedef struct
-{
- uint8_t fast[1 << FAST_BITS];
- // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
- uint16_t code[256];
- uint8_t values[256];
- uint8_t size[257];
- unsigned int maxcode[18];
- int delta[17]; // old 'firstsymbol' - old 'firstcode'
-} huffman;
-
-typedef struct
-{
- #if STBI_SIMD
- unsigned short dequant2[4][64];
- #endif
- stbi s;
- huffman huff_dc[4];
- huffman huff_ac[4];
- uint8_t dequant[4][64];
-
-// sizes for components, interleaved MCUs
- int img_h_max, img_v_max;
- int img_mcu_x, img_mcu_y;
- int img_mcu_w, img_mcu_h;
-
-// definition of jpeg image component
- struct
- {
- int id;
- int h,v;
- int tq;
- int hd,ha;
- int dc_pred;
-
- int x,y,w2,h2;
- uint8_t *data;
- void *raw_data;
- uint8_t *linebuf;
- } img_comp[4];
-
- uint32_t code_buffer; // jpeg entropy-coded buffer
- int code_bits; // number of valid bits
- unsigned char marker; // marker seen while filling entropy buffer
- int nomore; // flag if we saw a marker so must stop
-
- int scan_n, order[4];
- int restart_interval, todo;
-} jpeg;
-
-static int build_huffman(huffman *h, int *count)
-{
- int i,j,k=0,code;
- // build size list for each symbol (from JPEG spec)
- for (i=0; i < 16; ++i)
- for (j=0; j < count[i]; ++j)
- h->size[k++] = (uint8_t) (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_t) (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_t) i;
- }
- }
- }
- return 1;
-}
-
-static void grow_buffer_unsafe(jpeg *j)
-{
- do {
- int b = j->nomore ? 0 : get8(&j->s);
- if (b == 0xff) {
- int c = get8(&j->s);
- if (c != 0) {
- j->marker = (unsigned char) c;
- j->nomore = 1;
- return;
- }
- }
- j->code_buffer = (j->code_buffer << 8) | b;
- j->code_bits += 8;
- } while (j->code_bits <= 24);
-}
-
-// (1 << n) - 1
-static uint32_t 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(jpeg *j, huffman *h)
-{
- unsigned int temp;
- int c,k;
-
- if (j->code_bits < 16) grow_buffer_unsafe(j);
-
- // look at the top FAST_BITS and determine what symbol ID it is,
- // if the code is <= FAST_BITS
- c = (j->code_buffer >> (j->code_bits - FAST_BITS)) & ((1 << FAST_BITS)-1);
- k = h->fast[c];
- if (k < 255) {
- if (h->size[k] > j->code_bits)
- return -1;
- j->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 (j->code_bits < 16)
- temp = (j->code_buffer << (16 - j->code_bits)) & 0xffff;
- else
- temp = (j->code_buffer >> (j->code_bits - 16)) & 0xffff;
- for (k=FAST_BITS+1 ; ; ++k)
- if (temp < h->maxcode[k])
- break;
- if (k == 17) {
- // error! code not found
- j->code_bits -= 16;
- return -1;
- }
-
- if (k > j->code_bits)
- return -1;
-
- // convert the huffman code to the symbol id
- c = ((j->code_buffer >> (j->code_bits - k)) & bmask[k]) + h->delta[k];
- assert((((j->code_buffer) >> (j->code_bits - h->size[c])) & bmask[h->size[c]]) == h->code[c]);
-
- // convert the id to a symbol
- j->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(jpeg *j, int n)
-{
- unsigned int m = 1 << (n-1);
- unsigned int k;
- if (j->code_bits < n) grow_buffer_unsafe(j);
- k = (j->code_buffer >> (j->code_bits - n)) & bmask[n];
- j->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_t dezigzag[64+15] =
-{
- 0, 1, 8, 16, 9, 2, 3, 10,
- 17, 24, 32, 25, 18, 11, 4, 5,
- 12, 19, 26, 33, 40, 48, 41, 34,
- 27, 20, 13, 6, 7, 14, 21, 28,
- 35, 42, 49, 56, 57, 50, 43, 36,
- 29, 22, 15, 23, 30, 37, 44, 51,
- 58, 59, 52, 45, 38, 31, 39, 46,
- 53, 60, 61, 54, 47, 55, 62, 63,
- // let corrupt input sample past end
- 63, 63, 63, 63, 63, 63, 63, 63,
- 63, 63, 63, 63, 63, 63, 63
-};
-
-// decode one 64-entry block--
-static int decode_block(jpeg *j, short data[64], huffman *hdc, huffman *hac, int b)
-{
- int diff,dc,k;
- int t = decode(j, hdc);
- if (t < 0) return e("bad huffman code","Corrupt JPEG");
-
- // 0 all the ac values now so we can do it 32-bits at a time
- memset(data,0,64*sizeof(data[0]));
-
- diff = t ? extend_receive(j, t) : 0;
- dc = j->img_comp[b].dc_pred + diff;
- j->img_comp[b].dc_pred = dc;
- data[0] = (short) dc;
-
- // decode AC components, see JPEG spec
- k = 1;
- do {
- int r,s;
- int rs = decode(j, hac);
- if (rs < 0) return e("bad huffman code","Corrupt JPEG");
- s = rs & 15;
- r = rs >> 4;
- if (s == 0) {
- if (rs != 0xf0) break; // end block
- k += 16;
- } else {
- k += r;
- // decode into unzigzag'd location
- data[dezigzag[k++]] = (short) extend_receive(j,s);
- }
- } while (k < 64);
- return 1;
-}
-
-// take a -128..127 value and clamp it and convert to 0..255
-__forceinline static uint8_t 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_t) 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_t *out, int out_stride, short data[64], uint8_t *dequantize)
-{
- int i,val[64],*v=val;
- uint8_t *o,*dq = dequantize;
- short *d = data;
-
- // columns
- for (i=0; i < 8; ++i,++d,++dq, ++v) {
- // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
- if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
- && d[40]==0 && d[48]==0 && d[56]==0) {
- // no shortcut 0 seconds
- // (1|2|3|4|5|6|7)==0 0 seconds
- // all separate -0.047 seconds
- // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
- int dcterm = d[0] * dq[0] << 2;
- v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
- } else {
- IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
- d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56])
- // constants scaled things up by 1<<12; let's bring them back
- // down, but keep 2 extra bits of precision
- x0 += 512; x1 += 512; x2 += 512; x3 += 512;
- v[ 0] = (x0+t3) >> 10;
- v[56] = (x0-t3) >> 10;
- v[ 8] = (x1+t2) >> 10;
- v[48] = (x1-t2) >> 10;
- v[16] = (x2+t1) >> 10;
- v[40] = (x2-t1) >> 10;
- v[24] = (x3+t0) >> 10;
- v[32] = (x3-t0) >> 10;
- }
- }
-
- for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
- // no fast case since the first 1D IDCT spread components out
- IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
- // constants scaled things up by 1<<12, plus we had 1<<2 from first
- // loop, plus horizontal and vertical each scale by sqrt(8) so together
- // we've got an extra 1<<3, so 1<<17 total we need to remove.
- 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_t *out, int out_stride, short data[64], unsigned short *dequantize)
-{
- int i,val[64],*v=val;
- uint8_t *o;
- unsigned short *dq = dequantize;
- short *d = data;
-
- // columns
- for (i=0; i < 8; ++i,++d,++dq, ++v) {
- // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
- if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
- && d[40]==0 && d[48]==0 && d[56]==0) {
- // no shortcut 0 seconds
- // (1|2|3|4|5|6|7)==0 0 seconds
- // all separate -0.047 seconds
- // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
- int dcterm = d[0] * dq[0] << 2;
- v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
- } else {
- IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
- d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56])
- // constants scaled things up by 1<<12; let's bring them back
- // down, but keep 2 extra bits of precision
- x0 += 512; x1 += 512; x2 += 512; x3 += 512;
- v[ 0] = (x0+t3) >> 10;
- v[56] = (x0-t3) >> 10;
- v[ 8] = (x1+t2) >> 10;
- v[48] = (x1-t2) >> 10;
- v[16] = (x2+t1) >> 10;
- v[40] = (x2-t1) >> 10;
- v[24] = (x3+t0) >> 10;
- v[32] = (x3-t0) >> 10;
- }
- }
-
- for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
- // no fast case since the first 1D IDCT spread components out
- IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
- // constants scaled things up by 1<<12, plus we had 1<<2 from first
- // loop, plus horizontal and vertical each scale by sqrt(8) so together
- // we've got an extra 1<<3, so 1<<17 total we need to remove.
- 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_t get_marker(jpeg *j)
-{
- uint8_t x;
- if (j->marker != MARKER_none) { x = j->marker; j->marker = MARKER_none; return x; }
- x = get8u(&j->s);
- if (x != 0xff) return MARKER_none;
- while (x == 0xff)
- x = get8u(&j->s);
- return x;
-}
-
-// in each scan, we'll have scan_n components, and the order
-// of the components is specified by order[]
-#define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
-
-// after a restart interval, reset the entropy decoder and
-// the dc prediction
-static void reset(jpeg *j)
-{
- j->code_bits = 0;
- j->code_buffer = 0;
- j->nomore = 0;
- j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0;
- j->marker = MARKER_none;
- j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
- // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
- // since we don't even allow 1<<30 pixels
-}
-
-static int parse_entropy_coded_data(jpeg *z)
-{
- reset(z);
- if (z->scan_n == 1) {
- int i,j;
- #if STBI_SIMD
- __declspec(align(16))
- #endif
- short data[64];
- int n = z->order[0];
- // non-interleaved data, we just need to process one block at a time,
- // in trivial scanline order
- // number of blocks to do just depends on how many actual "pixels" this
- // component has, independent of interleaved MCU blocking and such
- int w = (z->img_comp[n].x+7) >> 3;
- int h = (z->img_comp[n].y+7) >> 3;
- for (j=0; j < h; ++j) {
- for (i=0; i < w; ++i) {
- if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
- #if STBI_SIMD
- stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
- #else
- idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
- #endif
- // every data block is an MCU, so countdown the restart interval
- if (--z->todo <= 0) {
- if (z->code_bits < 24) grow_buffer_unsafe(z);
- // if it's NOT a restart, then just bail, so we get corrupt data
- // rather than no data
- if (!RESTART(z->marker)) return 1;
- reset(z);
- }
- }
- }
- } else { // interleaved!
- int i,j,k,x,y;
- short data[64];
- for (j=0; j < z->img_mcu_y; ++j) {
- for (i=0; i < z->img_mcu_x; ++i) {
- // scan an interleaved mcu... process scan_n components in order
- for (k=0; k < z->scan_n; ++k) {
- int n = z->order[k];
- // scan out an mcu's worth of this component; that's just determined
- // by the basic H and V specified for the component
- for (y=0; y < z->img_comp[n].v; ++y) {
- for (x=0; x < z->img_comp[n].h; ++x) {
- int x2 = (i*z->img_comp[n].h + x)*8;
- int y2 = (j*z->img_comp[n].v + y)*8;
- if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
- #if STBI_SIMD
- stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
- #else
- idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
- #endif
- }
- }
- }
- // after all interleaved components, that's an interleaved MCU,
- // so now count down the restart interval
- if (--z->todo <= 0) {
- if (z->code_bits < 24) grow_buffer_unsafe(z);
- // if it's NOT a restart, then just bail, so we get corrupt data
- // rather than no data
- if (!RESTART(z->marker)) return 1;
- reset(z);
- }
- }
- }
- }
- return 1;
-}
-
-static int process_marker(jpeg *z, int m)
-{
- int L;
- switch (m) {
- case MARKER_none: // no marker found
- return e("expected marker","Corrupt JPEG");
-
- case 0xC2: // SOF - progressive
- return e("progressive jpeg","JPEG format not supported (progressive)");
-
- case 0xDD: // DRI - specify restart interval
- if (get16(&z->s) != 4) return e("bad DRI len","Corrupt JPEG");
- z->restart_interval = get16(&z->s);
- return 1;
-
- case 0xDB: // DQT - define quantization table
- L = get16(&z->s)-2;
- while (L > 0) {
- int q = get8(&z->s);
- int p = q >> 4;
- int t = q & 15,i;
- if (p != 0) return e("bad DQT type","Corrupt JPEG");
- if (t > 3) return e("bad DQT table","Corrupt JPEG");
- for (i=0; i < 64; ++i)
- z->dequant[t][dezigzag[i]] = get8u(&z->s);
- #if STBI_SIMD
- for (i=0; i < 64; ++i)
- z->dequant2[t][i] = z->dequant[t][i];
- #endif
- L -= 65;
- }
- return L==0;
-
- case 0xC4: // DHT - define huffman table
- L = get16(&z->s)-2;
- while (L > 0) {
- uint8_t *v;
- int sizes[16],i,m=0;
- int q = get8(&z->s);
- int tc = q >> 4;
- int th = q & 15;
- if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG");
- for (i=0; i < 16; ++i) {
- sizes[i] = get8(&z->s);
- m += sizes[i];
- }
- L -= 17;
- if (tc == 0) {
- if (!build_huffman(z->huff_dc+th, sizes)) return 0;
- v = z->huff_dc[th].values;
- } else {
- if (!build_huffman(z->huff_ac+th, sizes)) return 0;
- v = z->huff_ac[th].values;
- }
- for (i=0; i < m; ++i)
- v[i] = get8u(&z->s);
- L -= m;
- }
- return L==0;
- }
- // check for comment block or APP blocks
- if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
- skip(&z->s, get16(&z->s)-2);
- return 1;
- }
- return 0;
-}
-
-// after we see SOS
-static int process_scan_header(jpeg *z)
-{
- int i;
- int Ls = get16(&z->s);
- z->scan_n = get8(&z->s);
- if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s.img_n) return e("bad SOS component count","Corrupt JPEG");
- if (Ls != 6+2*z->scan_n) return e("bad SOS len","Corrupt JPEG");
- for (i=0; i < z->scan_n; ++i) {
- int id = get8(&z->s), which;
- int q = get8(&z->s);
- for (which = 0; which < z->s.img_n; ++which)
- if (z->img_comp[which].id == id)
- break;
- if (which == z->s.img_n) return 0;
- z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG");
- z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG");
- z->order[i] = which;
- }
- if (get8(&z->s) != 0) return e("bad SOS","Corrupt JPEG");
- get8(&z->s); // should be 63, but might be 0
- if (get8(&z->s) != 0) return e("bad SOS","Corrupt JPEG");
-
- return 1;
-}
-
-static int process_frame_header(jpeg *z, int scan)
-{
- stbi *s = &z->s;
- int Lf,p,i,q, h_max=1,v_max=1,c;
- Lf = get16(s); if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG
- p = get8(s); if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
- s->img_y = get16(s); if (s->img_y == 0) return e("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
- s->img_x = get16(s); if (s->img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires
- c = get8(s);
- if (c != 3 && c != 1) return e("bad component count","Corrupt JPEG"); // JFIF requires
- s->img_n = c;
- for (i=0; i < c; ++i) {
- z->img_comp[i].data = NULL;
- z->img_comp[i].linebuf = NULL;
- }
-
- if (Lf != 8+3*s->img_n) return e("bad SOF len","Corrupt JPEG");
-
- for (i=0; i < s->img_n; ++i) {
- z->img_comp[i].id = get8(s);
- if (z->img_comp[i].id != i+1) // JFIF requires
- if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files!
- return e("bad component ID","Corrupt JPEG");
- q = get8(s);
- z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return e("bad H","Corrupt JPEG");
- z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return e("bad V","Corrupt JPEG");
- z->img_comp[i].tq = get8(s); if (z->img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG");
- }
-
- if (scan != SCAN_load) return 1;
-
- if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode");
-
- for (i=0; i < s->img_n; ++i) {
- if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
- if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
- }
-
- // compute interleaved mcu info
- z->img_h_max = h_max;
- z->img_v_max = v_max;
- z->img_mcu_w = h_max * 8;
- z->img_mcu_h = v_max * 8;
- z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
- z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
-
- for (i=0; i < s->img_n; ++i) {
- // number of effective pixels (e.g. for non-interleaved MCU)
- z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
- z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
- // to simplify generation, we'll allocate enough memory to decode
- // the bogus oversized data from using interleaved MCUs and their
- // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
- // discard the extra data until colorspace conversion
- z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
- z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
- z->img_comp[i].raw_data = malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15);
- if (z->img_comp[i].raw_data == NULL) {
- for(--i; i >= 0; --i) {
- free(z->img_comp[i].raw_data);
- z->img_comp[i].data = NULL;
- }
- return e("outofmem", "Out of memory");
- }
- // align blocks for installable-idct using mmx/sse
- z->img_comp[i].data = (uint8_t*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
- z->img_comp[i].linebuf = NULL;
- }
-
- return 1;
-}
-
-// use comparisons since in some cases we handle more than one case (e.g. SOF)
-#define DNL(x) ((x) == 0xdc)
-#define SOI(x) ((x) == 0xd8)
-#define EOI(x) ((x) == 0xd9)
-#define SOF(x) ((x) == 0xc0 || (x) == 0xc1)
-#define SOS(x) ((x) == 0xda)
-
-static int decode_jpeg_header(jpeg *z, int scan)
-{
- int m;
- z->marker = MARKER_none; // initialize cached marker to empty
- m = get_marker(z);
- if (!SOI(m)) return e("no SOI","Corrupt JPEG");
- if (scan == SCAN_type) return 1;
- m = get_marker(z);
- while (!SOF(m)) {
- if (!process_marker(z,m)) return 0;
- m = get_marker(z);
- while (m == MARKER_none) {
- // some files have extra padding after their blocks, so ok, we'll scan
- if (at_eof(&z->s)) return e("no SOF", "Corrupt JPEG");
- m = get_marker(z);
- }
- }
- if (!process_frame_header(z, scan)) return 0;
- return 1;
-}
-
-static int decode_jpeg_image(jpeg *j)
-{
- int m;
- j->restart_interval = 0;
- if (!decode_jpeg_header(j, SCAN_load)) return 0;
- m = get_marker(j);
- while (!EOI(m)) {
- if (SOS(m)) {
- if (!process_scan_header(j)) return 0;
- if (!parse_entropy_coded_data(j)) return 0;
- } else {
- if (!process_marker(j, m)) return 0;
- }
- m = get_marker(j);
- }
- return 1;
-}
-
-// static jfif-centered resampling (across block boundaries)
-
-typedef uint8_t *(*resample_row_func)(uint8_t *out, uint8_t *in0, uint8_t *in1,
- int w, int hs);
-
-#define div4(x) ((uint8_t) ((x) >> 2))
-
-static uint8_t *resample_row_1(uint8_t *out, uint8_t *in_near, uint8_t *in_far, int w, int hs)
-{
- return in_near;
-}
-
-static uint8_t* resample_row_v_2(uint8_t *out, uint8_t *in_near, uint8_t *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_t* resample_row_h_2(uint8_t *out, uint8_t *in_near, uint8_t *in_far, int w, int hs)
-{
- // need to generate two samples horizontally for every one in input
- int i;
- uint8_t *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_t) ((x) >> 4))
-
-static uint8_t *resample_row_hv_2(uint8_t *out, uint8_t *in_near, uint8_t *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_t *resample_row_generic(uint8_t *out, uint8_t *in_near, uint8_t *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_t *out, const uint8_t *y, const uint8_t *pcb, const uint8_t *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_t)r;
- out[1] = (uint8_t)g;
- out[2] = (uint8_t)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(jpeg *j)
-{
- int i;
- for (i=0; i < j->s.img_n; ++i) {
- if (j->img_comp[i].data) {
- free(j->img_comp[i].raw_data);
- j->img_comp[i].data = NULL;
- }
- if (j->img_comp[i].linebuf) {
- free(j->img_comp[i].linebuf);
- j->img_comp[i].linebuf = NULL;
- }
- }
-}
-
-typedef struct
-{
- resample_row_func resample;
- uint8_t *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_t *load_jpeg_image(jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
-{
- int n, decode_n;
- // validate req_comp
- if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
- z->s.img_n = 0;
-
- // load a jpeg image from whichever source
- if (!decode_jpeg_image(z)) { cleanup_jpeg(z); return NULL; }
-
- // determine actual number of components to generate
- n = req_comp ? req_comp : z->s.img_n;
-
- if (z->s.img_n == 3 && n < 3)
- decode_n = 1;
- else
- decode_n = z->s.img_n;
-
- // resample and color-convert
- {
- int k;
- unsigned int i,j;
- uint8_t *output;
- uint8_t *coutput[4];
-
- stbi_resample res_comp[4];
-
- for (k=0; k < decode_n; ++k) {
- stbi_resample *r = &res_comp[k];
-
- // allocate line buffer big enough for upsampling off the edges
- // with upsample factor of 4
- z->img_comp[k].linebuf = (uint8_t *) malloc(z->s.img_x + 3);
- if (!z->img_comp[k].linebuf) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }
-
- r->hs = z->img_h_max / z->img_comp[k].h;
- r->vs = z->img_v_max / z->img_comp[k].v;
- r->ystep = r->vs >> 1;
- r->w_lores = (z->s.img_x + r->hs-1) / r->hs;
- r->ypos = 0;
- r->line0 = r->line1 = z->img_comp[k].data;
-
- if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
- else if (r->hs == 1 && r->vs == 2) r->resample = resample_row_v_2;
- else if (r->hs == 2 && r->vs == 1) r->resample = resample_row_h_2;
- else if (r->hs == 2 && r->vs == 2) r->resample = resample_row_hv_2;
- else r->resample = resample_row_generic;
- }
-
- // can't error after this so, this is safe
- output = (uint8_t *) malloc(n * z->s.img_x * z->s.img_y + 1);
- if (!output) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }
-
- // now go ahead and resample
- for (j=0; j < z->s.img_y; ++j) {
- uint8_t *out = output + n * z->s.img_x * j;
- for (k=0; k < decode_n; ++k) {
- stbi_resample *r = &res_comp[k];
- int y_bot = r->ystep >= (r->vs >> 1);
- coutput[k] = r->resample(z->img_comp[k].linebuf,
- y_bot ? r->line1 : r->line0,
- y_bot ? r->line0 : r->line1,
- r->w_lores, r->hs);
- if (++r->ystep >= r->vs) {
- r->ystep = 0;
- r->line0 = r->line1;
- if (++r->ypos < z->img_comp[k].y)
- r->line1 += z->img_comp[k].w2;
- }
- }
- if (n >= 3) {
- uint8_t *y = coutput[0];
- if (z->s.img_n == 3) {
- #if STBI_SIMD
- stbi_YCbCr_installed(out, y, coutput[1], coutput[2], z->s.img_x, n);
- #else
- YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s.img_x, n);
- #endif
- } else
- for (i=0; i < z->s.img_x; ++i) {
- out[0] = out[1] = out[2] = y[i];
- out[3] = 255; // not used if n==3
- out += n;
- }
- } else {
- uint8_t *y = coutput[0];
- if (n == 1)
- for (i=0; i < z->s.img_x; ++i) out[i] = y[i];
- else
- for (i=0; i < z->s.img_x; ++i) *out++ = y[i], *out++ = 255;
- }
- }
- cleanup_jpeg(z);
- *out_x = z->s.img_x;
- *out_y = z->s.img_y;
- if (comp) *comp = z->s.img_n; // report original components, not output
- return output;
- }
-}
-
-#ifndef STBI_NO_STDIO
-unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- jpeg j;
- start_file(&j.s, f);
- return load_jpeg_image(&j, 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)
-{
- jpeg j;
- start_mem(&j.s, buffer,len);
- return load_jpeg_image(&j, x,y,comp,req_comp);
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_jpeg_test_file(FILE *f)
-{
- int n,r;
- jpeg j;
- n = ftell(f);
- start_file(&j.s, f);
- r = decode_jpeg_header(&j, SCAN_type);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_jpeg_test_memory(stbi_uc const *buffer, int len)
-{
- jpeg j;
- start_mem(&j.s, buffer,len);
- return decode_jpeg_header(&j, 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_t fast[1 << ZFAST_BITS];
- uint16_t firstcode[16];
- int maxcode[17];
- uint16_t firstsymbol[16];
- uint8_t size[288];
- uint16_t 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_t *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_t) code;
- z->firstsymbol[i] = (uint16_t) 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_t)s;
- z->value[c] = (uint16_t)i;
- if (s <= ZFAST_BITS) {
- int k = bit_reverse(next_code[s],s);
- while (k < (1 << ZFAST_BITS)) {
- z->fast[k] = (uint16_t) c;
- k += (1 << s);
- }
- }
- ++next_code[s];
- }
- }
- return 1;
-}
-
-// zlib-from-memory implementation for PNG reading
-// because PNG allows splitting the zlib stream arbitrarily,
-// and it's annoying structurally to have PNG call ZLIB call PNG,
-// we require PNG read all the IDATs and combine them into a single
-// memory buffer
-
-typedef struct
-{
- uint8_t *zbuffer, *zbuffer_end;
- int num_bits;
- uint32_t code_buffer;
-
- char *zout;
- char *zout_start;
- char *zout_end;
- int z_expandable;
-
- zhuffman z_length, z_distance;
-} zbuf;
-
-__forceinline static int zget8(zbuf *z)
-{
- if (z->zbuffer >= z->zbuffer_end) return 0;
- return *z->zbuffer++;
-}
-
-static void fill_bits(zbuf *z)
-{
- do {
- assert(z->code_buffer < (1U << z->num_bits));
- z->code_buffer |= zget8(z) << z->num_bits;
- z->num_bits += 8;
- } while (z->num_bits <= 24);
-}
-
-__forceinline static unsigned int zreceive(zbuf *z, int n)
-{
- unsigned int k;
- if (z->num_bits < n) fill_bits(z);
- k = z->code_buffer & ((1 << n) - 1);
- z->code_buffer >>= n;
- z->num_bits -= n;
- return k;
-}
-
-__forceinline static int zhuffman_decode(zbuf *a, zhuffman *z)
-{
- int b,s,k;
- if (a->num_bits < 16) fill_bits(a);
- b = z->fast[a->code_buffer & ZFAST_MASK];
- if (b < 0xffff) {
- s = z->size[b];
- a->code_buffer >>= s;
- a->num_bits -= s;
- return z->value[b];
- }
-
- // not resolved by fast table, so compute it the slow way
- // use jpeg approach, which requires MSbits at top
- k = bit_reverse(a->code_buffer, 16);
- for (s=ZFAST_BITS+1; ; ++s)
- if (k < z->maxcode[s])
- break;
- if (s == 16) return -1; // invalid code!
- // code size is s, so:
- b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
- assert(z->size[b] == s);
- a->code_buffer >>= s;
- a->num_bits -= s;
- return z->value[b];
-}
-
-static int expand(zbuf *z, int n) // need to make room for n bytes
-{
- char *q;
- int cur, limit;
- if (!z->z_expandable) return e("output buffer limit","Corrupt PNG");
- cur = (int) (z->zout - z->zout_start);
- limit = (int) (z->zout_end - z->zout_start);
- while (cur + n > limit)
- limit *= 2;
- q = (char *) realloc(z->zout_start, limit);
- if (q == NULL) return e("outofmem", "Out of memory");
- z->zout_start = q;
- z->zout = q + cur;
- z->zout_end = q + limit;
- return 1;
-}
-
-static int length_base[31] = {
- 3,4,5,6,7,8,9,10,11,13,
- 15,17,19,23,27,31,35,43,51,59,
- 67,83,99,115,131,163,195,227,258,0,0 };
-
-static int length_extra[31]=
-{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
-
-static int dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
-257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
-
-static int dist_extra[32] =
-{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
-
-static int parse_huffman_block(zbuf *a)
-{
- for(;;) {
- int z = zhuffman_decode(a, &a->z_length);
- if (z < 256) {
- if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes
- if (a->zout >= a->zout_end) if (!expand(a, 1)) return 0;
- *a->zout++ = (char) z;
- } else {
- uint8_t *p;
- int len,dist;
- if (z == 256) return 1;
- z -= 257;
- len = length_base[z];
- if (length_extra[z]) len += zreceive(a, length_extra[z]);
- z = zhuffman_decode(a, &a->z_distance);
- if (z < 0) return e("bad huffman code","Corrupt PNG");
- dist = dist_base[z];
- if (dist_extra[z]) dist += zreceive(a, dist_extra[z]);
- if (a->zout - a->zout_start < dist) return e("bad dist","Corrupt PNG");
- if (a->zout + len > a->zout_end) if (!expand(a, len)) return 0;
- p = (uint8_t *) (a->zout - dist);
- while (len--)
- *a->zout++ = *p++;
- }
- }
-}
-
-static int compute_huffman_codes(zbuf *a)
-{
- static uint8_t length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
- zhuffman z_codelength;
- uint8_t lencodes[286+32+137];//padding for maximum single op
- uint8_t codelength_sizes[19];
- int i,n;
-
- int hlit = zreceive(a,5) + 257;
- int hdist = zreceive(a,5) + 1;
- int hclen = zreceive(a,4) + 4;
-
- memset(codelength_sizes, 0, sizeof(codelength_sizes));
- for (i=0; i < hclen; ++i) {
- int s = zreceive(a,3);
- codelength_sizes[length_dezigzag[i]] = (uint8_t) s;
- }
- if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
-
- n = 0;
- while (n < hlit + hdist) {
- int c = zhuffman_decode(a, &z_codelength);
- assert(c >= 0 && c < 19);
- if (c < 16)
- lencodes[n++] = (uint8_t) c;
- else if (c == 16) {
- c = zreceive(a,2)+3;
- memset(lencodes+n, lencodes[n-1], c);
- n += c;
- } else if (c == 17) {
- c = zreceive(a,3)+3;
- memset(lencodes+n, 0, c);
- n += c;
- } else {
- assert(c == 18);
- c = zreceive(a,7)+11;
- memset(lencodes+n, 0, c);
- n += c;
- }
- }
- if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG");
- if (!zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
- if (!zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
- return 1;
-}
-
-static int parse_uncompressed_block(zbuf *a)
-{
- uint8_t header[4];
- int len,nlen,k;
- if (a->num_bits & 7)
- zreceive(a, a->num_bits & 7); // discard
- // drain the bit-packed data into header
- k = 0;
- while (a->num_bits > 0) {
- header[k++] = (uint8_t) (a->code_buffer & 255); // wtf this warns?
- a->code_buffer >>= 8;
- a->num_bits -= 8;
- }
- assert(a->num_bits == 0);
- // now fill header the normal way
- while (k < 4)
- header[k++] = (uint8_t) zget8(a);
- len = header[1] * 256 + header[0];
- nlen = header[3] * 256 + header[2];
- if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG");
- if (a->zbuffer + len > a->zbuffer_end) return e("read past buffer","Corrupt PNG");
- if (a->zout + len > a->zout_end)
- if (!expand(a, len)) return 0;
- memcpy(a->zout, a->zbuffer, len);
- a->zbuffer += len;
- a->zout += len;
- return 1;
-}
-
-static int parse_zlib_header(zbuf *a)
-{
- int cmf = zget8(a);
- int cm = cmf & 15;
- /* int cinfo = cmf >> 4; */
- int flg = zget8(a);
- if ((cmf*256+flg) % 31 != 0) return e("bad zlib header","Corrupt PNG"); // zlib spec
- if (flg & 32) return e("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
- if (cm != 8) return e("bad compression","Corrupt PNG"); // DEFLATE required for png
- // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
- return 1;
-}
-
-// @TODO: should statically initialize these for optimal thread safety
-static uint8_t default_length[288], default_distance[32];
-static void init_defaults(void)
-{
- int i; // use <= to match clearly with spec
- for (i=0; i <= 143; ++i) default_length[i] = 8;
- for ( ; i <= 255; ++i) default_length[i] = 9;
- for ( ; i <= 279; ++i) default_length[i] = 7;
- for ( ; i <= 287; ++i) default_length[i] = 8;
-
- for (i=0; i <= 31; ++i) default_distance[i] = 5;
-}
-
-int stbi_png_partial; // a quick hack to only allow decoding some of a PNG... I should implement real streaming support instead
-static int parse_zlib(zbuf *a, int parse_header)
-{
- int final, type;
- if (parse_header)
- if (!parse_zlib_header(a)) return 0;
- a->num_bits = 0;
- a->code_buffer = 0;
- do {
- final = zreceive(a,1);
- type = zreceive(a,2);
- if (type == 0) {
- if (!parse_uncompressed_block(a)) return 0;
- } else if (type == 3) {
- return 0;
- } else {
- if (type == 1) {
- // use fixed code lengths
- if (!default_distance[31]) init_defaults();
- if (!zbuild_huffman(&a->z_length , default_length , 288)) return 0;
- if (!zbuild_huffman(&a->z_distance, default_distance, 32)) return 0;
- } else {
- if (!compute_huffman_codes(a)) return 0;
- }
- if (!parse_huffman_block(a)) return 0;
- }
- if (stbi_png_partial && a->zout - a->zout_start > 65536)
- break;
- } while (!final);
- return 1;
-}
-
-static int do_zlib(zbuf *a, char *obuf, int olen, int exp, int parse_header)
-{
- a->zout_start = obuf;
- a->zout = obuf;
- a->zout_end = obuf + olen;
- a->z_expandable = exp;
-
- return parse_zlib(a, parse_header);
-}
-
-char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
-{
- zbuf a;
- char *p = (char *) malloc(initial_size);
- if (p == NULL) return NULL;
- a.zbuffer = (uint8_t *) buffer;
- a.zbuffer_end = (uint8_t *) buffer + len;
- if (do_zlib(&a, p, initial_size, 1, 1)) {
- if (outlen) *outlen = (int) (a.zout - a.zout_start);
- return a.zout_start;
- } else {
- free(a.zout_start);
- return NULL;
- }
-}
-
-char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
-{
- return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
-}
-
-int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
-{
- zbuf a;
- a.zbuffer = (uint8_t *) ibuffer;
- a.zbuffer_end = (uint8_t *) ibuffer + ilen;
- if (do_zlib(&a, obuffer, olen, 0, 1))
- return (int) (a.zout - a.zout_start);
- else
- return -1;
-}
-
-char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
-{
- zbuf a;
- char *p = (char *) malloc(16384);
- if (p == NULL) return NULL;
- a.zbuffer = (uint8_t *) buffer;
- a.zbuffer_end = (uint8_t *) buffer+len;
- if (do_zlib(&a, p, 16384, 1, 0)) {
- if (outlen) *outlen = (int) (a.zout - a.zout_start);
- return a.zout_start;
- } else {
- free(a.zout_start);
- return NULL;
- }
-}
-
-int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
-{
- zbuf a;
- a.zbuffer = (uint8_t *) ibuffer;
- a.zbuffer_end = (uint8_t *) ibuffer + ilen;
- if (do_zlib(&a, obuffer, olen, 0, 0))
- return (int) (a.zout - a.zout_start);
- else
- return -1;
-}
-
-// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
-// simple implementation
-// - only 8-bit samples
-// - no CRC checking
-// - allocates lots of intermediate memory
-// - avoids problem of streaming data between subsystems
-// - avoids explicit window management
-// performance
-// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
-
-
-typedef struct
-{
- uint32_t length;
- uint32_t type;
-} chunk;
-
-#define PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
-
-static chunk get_chunk_header(stbi *s)
-{
- chunk c;
- c.length = get32(s);
- c.type = get32(s);
- return c;
-}
-
-static int check_png_header(stbi *s)
-{
- static uint8_t png_sig[8] = { 137,80,78,71,13,10,26,10 };
- int i;
- for (i=0; i < 8; ++i)
- if (get8(s) != png_sig[i]) return e("bad png sig","Not a PNG");
- return 1;
-}
-
-typedef struct
-{
- stbi s;
- uint8_t *idata, *expanded, *out;
-} png;
-
-
-enum {
- F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4,
- F_avg_first, F_paeth_first,
-};
-
-static uint8_t first_row_filter[5] =
-{
- F_none, F_sub, F_none, F_avg_first, F_paeth_first
-};
-
-static int paeth(int a, int b, int c)
-{
- int p = a + b - c;
- int pa = abs(p-a);
- int pb = abs(p-b);
- int pc = abs(p-c);
- if (pa <= pb && pa <= pc) return a;
- if (pb <= pc) return b;
- return c;
-}
-
-// create the png data from post-deflated data
-static int create_png_image_raw(png *a, uint8_t *raw, uint32_t raw_len, int out_n, uint32_t x, uint32_t y)
-{
- stbi *s = &a->s;
- uint32_t i,j,stride = x*out_n;
- int k;
- int img_n = s->img_n; // copy it into a local for later
- assert(out_n == s->img_n || out_n == s->img_n+1);
- if (stbi_png_partial) y = 1;
- a->out = (uint8_t *) malloc(x * y * out_n);
- if (!a->out) return e("outofmem", "Out of memory");
- if (!stbi_png_partial) {
- if (s->img_x == x && s->img_y == y) {
- if (raw_len != (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG");
- } else { // interlaced:
- if (raw_len < (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG");
- }
- }
- for (j=0; j < y; ++j) {
- uint8_t *cur = a->out + stride*j;
- uint8_t *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_t) (raw[k] + paeth(0,prior[k],0)); break;
- case F_avg_first : cur[k] = raw[k]; break;
- case F_paeth_first: cur[k] = raw[k]; break;
- }
- }
- if (img_n != out_n) cur[img_n] = 255;
- raw += img_n;
- cur += out_n;
- prior += out_n;
- // this is a little gross, so that we don't switch per-pixel or per-component
- if (img_n == out_n) {
- #define CASE(f) \
- case f: \
- for (i=x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_n) \
- for (k=0; k < img_n; ++k)
- switch(filter) {
- CASE(F_none) cur[k] = raw[k]; break;
- CASE(F_sub) cur[k] = raw[k] + cur[k-img_n]; break;
- CASE(F_up) cur[k] = raw[k] + prior[k]; break;
- CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break;
- CASE(F_paeth) cur[k] = (uint8_t) (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_t) (raw[k] + paeth(cur[k-img_n],0,0)); break;
- }
- #undef CASE
- } else {
- assert(img_n+1 == out_n);
- #define CASE(f) \
- case f: \
- for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \
- for (k=0; k < img_n; ++k)
- switch(filter) {
- CASE(F_none) cur[k] = raw[k]; break;
- CASE(F_sub) cur[k] = raw[k] + cur[k-out_n]; break;
- CASE(F_up) cur[k] = raw[k] + prior[k]; break;
- CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break;
- CASE(F_paeth) cur[k] = (uint8_t) (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_t) (raw[k] + paeth(cur[k-out_n],0,0)); break;
- }
- #undef CASE
- }
- }
- return 1;
-}
-
-static int create_png_image(png *a, uint8_t *raw, uint32_t raw_len, int out_n, int interlaced)
-{
- uint8_t *final;
- int p;
- int save;
- if (!interlaced)
- return create_png_image_raw(a, raw, raw_len, out_n, a->s.img_x, a->s.img_y);
- save = stbi_png_partial;
- stbi_png_partial = 0;
-
- // de-interlacing
- final = (uint8_t *) malloc(a->s.img_x * a->s.img_y * out_n);
- for (p=0; p < 7; ++p) {
- int xorig[] = { 0,4,0,2,0,1,0 };
- int yorig[] = { 0,0,4,0,2,0,1 };
- int xspc[] = { 8,8,4,4,2,2,1 };
- int yspc[] = { 8,8,8,4,4,2,2 };
- int i,j,x,y;
- // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
- x = (a->s.img_x - xorig[p] + xspc[p]-1) / xspc[p];
- y = (a->s.img_y - yorig[p] + yspc[p]-1) / yspc[p];
- if (x && y) {
- if (!create_png_image_raw(a, raw, raw_len, out_n, x, y)) {
- free(final);
- return 0;
- }
- for (j=0; j < y; ++j)
- for (i=0; i < x; ++i)
- memcpy(final + (j*yspc[p]+yorig[p])*a->s.img_x*out_n + (i*xspc[p]+xorig[p])*out_n,
- a->out + (j*x+i)*out_n, out_n);
- free(a->out);
- raw += (x*out_n+1)*y;
- raw_len -= (x*out_n+1)*y;
- }
- }
- a->out = final;
-
- stbi_png_partial = save;
- return 1;
-}
-
-static int compute_transparency(png *z, uint8_t tc[3], int out_n)
-{
- stbi *s = &z->s;
- uint32_t i, pixel_count = s->img_x * s->img_y;
- uint8_t *p = z->out;
-
- // compute color-based transparency, assuming we've
- // already got 255 as the alpha value in the output
- assert(out_n == 2 || out_n == 4);
-
- if (out_n == 2) {
- for (i=0; i < pixel_count; ++i) {
- p[1] = (p[0] == tc[0] ? 0 : 255);
- p += 2;
- }
- } else {
- for (i=0; i < pixel_count; ++i) {
- if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
- p[3] = 0;
- p += 4;
- }
- }
- return 1;
-}
-
-static int expand_palette(png *a, uint8_t *palette, int len, int pal_img_n)
-{
- uint32_t i, pixel_count = a->s.img_x * a->s.img_y;
- uint8_t *p, *temp_out, *orig = a->out;
-
- p = (uint8_t *) malloc(pixel_count * pal_img_n);
- if (p == NULL) return e("outofmem", "Out of memory");
-
- // between here and free(out) below, exitting would leak
- temp_out = p;
-
- if (pal_img_n == 3) {
- for (i=0; i < pixel_count; ++i) {
- int n = orig[i]*4;
- p[0] = palette[n ];
- p[1] = palette[n+1];
- p[2] = palette[n+2];
- p += 3;
- }
- } else {
- for (i=0; i < pixel_count; ++i) {
- int n = orig[i]*4;
- p[0] = palette[n ];
- p[1] = palette[n+1];
- p[2] = palette[n+2];
- p[3] = palette[n+3];
- p += 4;
- }
- }
- free(a->out);
- a->out = temp_out;
- return 1;
-}
-
-static int parse_png_file(png *z, int scan, int req_comp)
-{
- uint8_t palette[1024], pal_img_n=0;
- uint8_t has_trans=0, tc[3];
- uint32_t ioff=0, idata_limit=0, i, pal_len=0;
- int first=1,k,interlace=0;
- stbi *s = &z->s;
-
- if (!check_png_header(s)) return 0;
-
- if (scan == SCAN_type) return 1;
-
- for(;;first=0) {
- chunk c = get_chunk_header(s);
- 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,comp,filter;
- if (!first) return e("multiple IHDR","Corrupt PNG");
- if (c.length != 13) return e("bad IHDR len","Corrupt PNG");
- s->img_x = get32(s); if (s->img_x > (1 << 24)) return e("too large","Very large image (corrupt?)");
- s->img_y = get32(s); if (s->img_y > (1 << 24)) return e("too large","Very large image (corrupt?)");
- depth = get8(s); if (depth != 8) return e("8bit only","PNG not supported: 8-bit only");
- color = get8(s); if (color > 6) return e("bad ctype","Corrupt PNG");
- if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype","Corrupt PNG");
- comp = get8(s); if (comp) return e("bad comp method","Corrupt PNG");
- filter= get8(s); if (filter) return e("bad filter method","Corrupt PNG");
- interlace = get8(s); if (interlace>1) return e("bad interlace method","Corrupt PNG");
- if (!s->img_x || !s->img_y) return e("0-pixel image","Corrupt PNG");
- if (!pal_img_n) {
- s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
- if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode");
- if (scan == SCAN_header) return 1;
- } else {
- // if paletted, then pal_n is our final components, and
- // img_n is # components to decompress/filter.
- s->img_n = 1;
- if ((1 << 30) / s->img_x / 4 < s->img_y) return e("too large","Corrupt PNG");
- // if SCAN_header, have to scan to see if we have a tRNS
- }
- break;
- }
-
- case PNG_TYPE('P','L','T','E'): {
- if (c.length > 256*3) return e("invalid PLTE","Corrupt PNG");
- pal_len = c.length / 3;
- if (pal_len * 3 != c.length) return e("invalid PLTE","Corrupt PNG");
- for (i=0; i < pal_len; ++i) {
- palette[i*4+0] = get8u(s);
- palette[i*4+1] = get8u(s);
- palette[i*4+2] = get8u(s);
- palette[i*4+3] = 255;
- }
- break;
- }
-
- case PNG_TYPE('t','R','N','S'): {
- if (z->idata) return e("tRNS after IDAT","Corrupt PNG");
- if (pal_img_n) {
- if (scan == SCAN_header) { s->img_n = 4; return 1; }
- if (pal_len == 0) return e("tRNS before PLTE","Corrupt PNG");
- if (c.length > pal_len) return e("bad tRNS len","Corrupt PNG");
- pal_img_n = 4;
- for (i=0; i < c.length; ++i)
- palette[i*4+3] = get8u(s);
- } else {
- if (!(s->img_n & 1)) return e("tRNS with alpha","Corrupt PNG");
- if (c.length != (uint32_t) s->img_n*2) return e("bad tRNS len","Corrupt PNG");
- has_trans = 1;
- for (k=0; k < s->img_n; ++k)
- tc[k] = (uint8_t) get16(s); // 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) { s->img_n = pal_img_n; return 1; }
- if (ioff + c.length > idata_limit) {
- uint8_t *p;
- if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
- while (ioff + c.length > idata_limit)
- idata_limit *= 2;
- p = (uint8_t *) realloc(z->idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory");
- z->idata = p;
- }
- #ifndef STBI_NO_STDIO
- if (s->img_file)
- {
- if (fread(z->idata+ioff,1,c.length,s->img_file) != c.length) return e("outofdata","Corrupt PNG");
- }
- else
- #endif
- {
- memcpy(z->idata+ioff, s->img_buffer, c.length);
- s->img_buffer += c.length;
- }
- ioff += c.length;
- break;
- }
-
- case PNG_TYPE('I','E','N','D'): {
- uint32_t raw_len;
- if (scan != SCAN_load) return 1;
- if (z->idata == NULL) return e("no IDAT","Corrupt PNG");
- z->expanded = (uint8_t *) stbi_zlib_decode_malloc((char *) z->idata, ioff, (int *) &raw_len);
- if (z->expanded == NULL) return 0; // zlib should set error
- free(z->idata); z->idata = NULL;
- if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
- s->img_out_n = s->img_n+1;
- else
- s->img_out_n = s->img_n;
- if (!create_png_image(z, z->expanded, raw_len, s->img_out_n, interlace)) return 0;
- if (has_trans)
- if (!compute_transparency(z, tc, s->img_out_n)) return 0;
- if (pal_img_n) {
- // pal_img_n == 3 or 4
- s->img_n = pal_img_n; // record the actual colors we had
- s->img_out_n = pal_img_n;
- if (req_comp >= 3) s->img_out_n = req_comp;
- if (!expand_palette(z, palette, pal_len, s->img_out_n))
- return 0;
- }
- free(z->expanded); z->expanded = NULL;
- return 1;
- }
-
- default:
- // if critical, fail
- if ((c.type & (1 << 29)) == 0) {
- #ifndef STBI_NO_FAILURE_STRINGS
- // not threadsafe
- static char invalid_chunk[] = "XXXX chunk not known";
- invalid_chunk[0] = (uint8_t) (c.type >> 24);
- invalid_chunk[1] = (uint8_t) (c.type >> 16);
- invalid_chunk[2] = (uint8_t) (c.type >> 8);
- invalid_chunk[3] = (uint8_t) (c.type >> 0);
- #endif
- return e(invalid_chunk, "PNG not supported: unknown chunk type");
- }
- skip(s, c.length);
- break;
- }
- // end of chunk, read and skip CRC
- get32(s);
- }
-}
-
-static unsigned char *do_png(png *p, int *x, int *y, int *n, int req_comp)
-{
- unsigned char *result=NULL;
- p->expanded = NULL;
- p->idata = NULL;
- p->out = NULL;
- if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
- if (parse_png_file(p, SCAN_load, req_comp)) {
- result = p->out;
- p->out = NULL;
- if (req_comp && req_comp != p->s.img_out_n) {
- result = convert_format(result, p->s.img_out_n, req_comp, p->s.img_x, p->s.img_y);
- p->s.img_out_n = req_comp;
- if (result == NULL) return result;
- }
- *x = p->s.img_x;
- *y = p->s.img_y;
- if (n) *n = p->s.img_n;
- }
- free(p->out); p->out = NULL;
- free(p->expanded); p->expanded = NULL;
- free(p->idata); p->idata = NULL;
-
- return result;
-}
-
-#ifndef STBI_NO_STDIO
-unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- png p;
- start_file(&p.s, f);
- return do_png(&p, 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)
-{
- png p;
- start_mem(&p.s, buffer,len);
- return do_png(&p, x,y,comp,req_comp);
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_png_test_file(FILE *f)
-{
- png p;
- int n,r;
- n = ftell(f);
- start_file(&p.s, f);
- r = parse_png_file(&p, SCAN_type,STBI_default);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_png_test_memory(stbi_uc const *buffer, int len)
-{
- png p;
- start_mem(&p.s, buffer, len);
- return parse_png_file(&p, SCAN_type,STBI_default);
-}
-
-// TODO: load header from png
-#ifndef STBI_NO_STDIO
-int stbi_png_info (char const *filename, int *x, int *y, int *comp)
-{
- png p;
- FILE *f = fopen(filename, "rb");
- if (!f) return 0;
- start_file(&p.s, f);
- if (parse_png_file(&p, SCAN_header, 0)) {
- if(x) *x = p.s.img_x;
- if(y) *y = p.s.img_y;
- if (comp) *comp = p.s.img_n;
- fclose(f);
- return 1;
- }
- fclose(f);
- return 0;
-}
-
-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(stbi *s)
-{
- int sz;
- if (get8(s) != 'B') return 0;
- if (get8(s) != 'M') return 0;
- get32le(s); // discard filesize
- get16le(s); // discard reserved
- get16le(s); // discard reserved
- get32le(s); // discard data offset
- sz = get32le(s);
- if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1;
- return 0;
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_bmp_test_file (FILE *f)
-{
- stbi s;
- int r,n = ftell(f);
- start_file(&s,f);
- r = bmp_test(&s);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_bmp_test_memory (stbi_uc const *buffer, int len)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return bmp_test(&s);
-}
-
-// returns 0..31 for the highest set bit
-static int high_bit(unsigned int z)
-{
- int n=0;
- if (z == 0) return -1;
- if (z >= 0x10000) n += 16, z >>= 16;
- if (z >= 0x00100) n += 8, z >>= 8;
- if (z >= 0x00010) n += 4, z >>= 4;
- if (z >= 0x00004) n += 2, z >>= 2;
- if (z >= 0x00002) n += 1, z >>= 1;
- return n;
-}
-
-static int bitcount(unsigned int a)
-{
- a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
- a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
- a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
- a = (a + (a >> 8)); // max 16 per 8 bits
- a = (a + (a >> 16)); // max 32 per 8 bits
- return a & 0xff;
-}
-
-static int shiftsigned(int v, int shift, int bits)
-{
- int result;
- int z=0;
-
- if (shift < 0) v <<= -shift;
- else v >>= shift;
- result = v;
-
- z = bits;
- while (z < 8) {
- result += v >> z;
- z += bits;
- }
- return result;
-}
-
-static stbi_uc *bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
- uint8_t *out;
- unsigned int mr=0,mg=0,mb=0,ma=0;
- stbi_uc pal[256][4];
- int psize=0,i,j,compress=0,width;
- int bpp, flip_vertically, pad, target, offset, hsz;
- if (get8(s) != 'B' || get8(s) != 'M') return epuc("not BMP", "Corrupt BMP");
- get32le(s); // discard filesize
- get16le(s); // discard reserved
- get16le(s); // discard reserved
- offset = get32le(s);
- hsz = get32le(s);
- if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown");
- failure_reason = "bad BMP";
- if (hsz == 12) {
- s->img_x = get16le(s);
- s->img_y = get16le(s);
- } else {
- s->img_x = get32le(s);
- s->img_y = get32le(s);
- }
- if (get16le(s) != 1) return 0;
- bpp = get16le(s);
- if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit");
- flip_vertically = ((int) s->img_y) > 0;
- s->img_y = abs((int) s->img_y);
- if (hsz == 12) {
- if (bpp < 24)
- psize = (offset - 14 - 24) / 3;
- } else {
- compress = get32le(s);
- if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE");
- get32le(s); // discard sizeof
- get32le(s); // discard hres
- get32le(s); // discard vres
- get32le(s); // discard colorsused
- get32le(s); // discard max important
- if (hsz == 40 || hsz == 56) {
- if (hsz == 56) {
- get32le(s);
- get32le(s);
- get32le(s);
- get32le(s);
- }
- if (bpp == 16 || bpp == 32) {
- mr = mg = mb = 0;
- if (compress == 0) {
- if (bpp == 32) {
- mr = 0xff << 16;
- mg = 0xff << 8;
- mb = 0xff << 0;
- ma = 0xff << 24;
- } else {
- mr = 31 << 10;
- mg = 31 << 5;
- mb = 31 << 0;
- }
- } else if (compress == 3) {
- mr = get32le(s);
- mg = get32le(s);
- mb = get32le(s);
- // not documented, but generated by photoshop and handled by mspaint
- if (mr == mg && mg == mb) {
- // ?!?!?
- return NULL;
- }
- } else
- return NULL;
- }
- } else {
- assert(hsz == 108);
- mr = get32le(s);
- mg = get32le(s);
- mb = get32le(s);
- ma = get32le(s);
- get32le(s); // discard color space
- for (i=0; i < 12; ++i)
- get32le(s); // discard color space parameters
- }
- if (bpp < 16)
- psize = (offset - 14 - hsz) >> 2;
- }
- s->img_n = ma ? 4 : 3;
- if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
- target = req_comp;
- else
- target = s->img_n; // if they want monochrome, we'll post-convert
- out = (stbi_uc *) malloc(target * s->img_x * s->img_y);
- if (!out) return epuc("outofmem", "Out of memory");
- if (bpp < 16) {
- int z=0;
- if (psize == 0 || psize > 256) { free(out); return epuc("invalid", "Corrupt BMP"); }
- for (i=0; i < psize; ++i) {
- pal[i][2] = get8(s);
- pal[i][1] = get8(s);
- pal[i][0] = get8(s);
- if (hsz != 12) get8(s);
- pal[i][3] = 255;
- }
- skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4));
- if (bpp == 4) width = (s->img_x + 1) >> 1;
- else if (bpp == 8) width = s->img_x;
- else { free(out); return epuc("bad bpp", "Corrupt BMP"); }
- pad = (-width)&3;
- for (j=0; j < (int) s->img_y; ++j) {
- for (i=0; i < (int) s->img_x; i += 2) {
- int v=get8(s),v2=0;
- if (bpp == 4) {
- v2 = v & 15;
- v >>= 4;
- }
- out[z++] = pal[v][0];
- out[z++] = pal[v][1];
- out[z++] = pal[v][2];
- if (target == 4) out[z++] = 255;
- if (i+1 == (int) s->img_x) break;
- v = (bpp == 8) ? get8(s) : v2;
- out[z++] = pal[v][0];
- out[z++] = pal[v][1];
- out[z++] = pal[v][2];
- if (target == 4) out[z++] = 255;
- }
- skip(s, pad);
- }
- } else {
- int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
- int z = 0;
- int easy=0;
- skip(s, offset - 14 - hsz);
- if (bpp == 24) width = 3 * s->img_x;
- else if (bpp == 16) width = 2*s->img_x;
- else /* bpp = 32 and pad = 0 */ width=0;
- pad = (-width) & 3;
- if (bpp == 24) {
- easy = 1;
- } else if (bpp == 32) {
- if (mb == 0xff && mg == 0xff00 && mr == 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) s->img_y; ++j) {
- if (easy) {
- for (i=0; i < (int) s->img_x; ++i) {
- int a;
- out[z+2] = get8(s);
- out[z+1] = get8(s);
- out[z+0] = get8(s);
- z += 3;
- a = (easy == 2 ? get8(s) : 255);
- if (target == 4) out[z++] = a;
- }
- } else {
- for (i=0; i < (int) s->img_x; ++i) {
- uint32_t v = (bpp == 16 ? get16le(s) : get32le(s));
- 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(s, pad);
- }
- }
- if (flip_vertically) {
- stbi_uc t;
- for (j=0; j < (int) s->img_y>>1; ++j) {
- stbi_uc *p1 = out + j *s->img_x*target;
- stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
- for (i=0; i < (int) s->img_x*target; ++i) {
- t = p1[i], p1[i] = p2[i], p2[i] = t;
- }
- }
- }
-
- if (req_comp && req_comp != target) {
- out = convert_format(out, target, req_comp, s->img_x, s->img_y);
- if (out == NULL) return out; // convert_format frees input on failure
- }
-
- *x = s->img_x;
- *y = s->img_y;
- if (comp) *comp = 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)
-{
- stbi s;
- start_file(&s, f);
- return bmp_load(&s, 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)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return bmp_load(&s, x,y,comp,req_comp);
-}
-
-// Targa Truevision - TGA
-// by Jonathan Dummer
-
-static int tga_test(stbi *s)
-{
- int sz;
- get8u(s); // discard Offset
- sz = get8u(s); // color type
- if( sz > 1 ) return 0; // only RGB or indexed allowed
- sz = get8u(s); // image type
- if( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE
- get16(s); // discard palette start
- get16(s); // discard palette length
- get8(s); // discard bits per palette color entry
- get16(s); // discard x origin
- get16(s); // discard y origin
- if( get16(s) < 1 ) return 0; // test width
- if( get16(s) < 1 ) return 0; // test height
- sz = get8(s); // bits per pixel
- if( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0; // only RGB or RGBA or grey allowed
- return 1; // seems to have passed everything
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_tga_test_file (FILE *f)
-{
- stbi s;
- int r,n = ftell(f);
- start_file(&s, f);
- r = tga_test(&s);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_tga_test_memory (stbi_uc const *buffer, int len)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return tga_test(&s);
-}
-
-static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
- // read in the TGA header stuff
- int tga_offset = get8u(s);
- int tga_indexed = get8u(s);
- int tga_image_type = get8u(s);
- int tga_is_RLE = 0;
- int tga_palette_start = get16le(s);
- int tga_palette_len = get16le(s);
- int tga_palette_bits = get8u(s);
- int tga_x_origin = get16le(s);
- int tga_y_origin = get16le(s);
- int tga_width = get16le(s);
- int tga_height = get16le(s);
- int tga_bits_per_pixel = get8u(s);
- int tga_inverted = get8u(s);
- // image data
- unsigned char *tga_data;
- unsigned char *tga_palette = NULL;
- int i, j;
- unsigned char raw_data[4];
- unsigned char trans_data[4];
- int RLE_count = 0;
- int RLE_repeating = 0;
- int read_next_pixel = 1;
- // do a tiny bit of precessing
- if( tga_image_type >= 8 )
- {
- tga_image_type -= 8;
- tga_is_RLE = 1;
- }
- /* int tga_alpha_bits = tga_inverted & 15; */
- tga_inverted = 1 - ((tga_inverted >> 5) & 1);
-
- // error check
- if( //(tga_indexed) ||
- (tga_width < 1) || (tga_height < 1) ||
- (tga_image_type < 1) || (tga_image_type > 3) ||
- ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
- (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32))
- )
- {
- return NULL;
- }
-
- // 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(s, tga_offset );
- // do I need to load a palette?
- if( tga_indexed )
- {
- // any data to skip? (offset usually = 0)
- skip(s, tga_palette_start );
- // load the palette
- tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 );
- getn(s, 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(s);
- RLE_count = 1 + (RLE_cmd & 127);
- RLE_repeating = RLE_cmd >> 7;
- read_next_pixel = 1;
- } else if( !RLE_repeating )
- {
- read_next_pixel = 1;
- }
- } else
- {
- read_next_pixel = 1;
- }
- // OK, if I need to read a pixel, do it now
- if( read_next_pixel )
- {
- // load however much data we did have
- if( tga_indexed )
- {
- // read in 1 byte, then perform the lookup
- int pal_idx = get8u(s);
- if( pal_idx >= tga_palette_len )
- {
- // invalid index
- pal_idx = 0;
- }
- pal_idx *= tga_bits_per_pixel / 8;
- for( j = 0; j*8 < tga_bits_per_pixel; ++j )
- {
- raw_data[j] = tga_palette[pal_idx+j];
- }
- } else
- {
- // read in the data raw
- for( j = 0; j*8 < tga_bits_per_pixel; ++j )
- {
- raw_data[j] = get8u(s);
- }
- }
- // convert raw to the intermediate format
- switch( tga_bits_per_pixel )
- {
- case 8:
- // Luminous => RGBA
- trans_data[0] = raw_data[0];
- trans_data[1] = raw_data[0];
- trans_data[2] = raw_data[0];
- trans_data[3] = 255;
- break;
- case 16:
- // Luminous,Alpha => RGBA
- trans_data[0] = raw_data[0];
- trans_data[1] = raw_data[0];
- trans_data[2] = raw_data[0];
- trans_data[3] = raw_data[1];
- break;
- case 24:
- // BGR => RGBA
- trans_data[0] = raw_data[2];
- trans_data[1] = raw_data[1];
- trans_data[2] = raw_data[0];
- trans_data[3] = 255;
- break;
- case 32:
- // BGRA => RGBA
- trans_data[0] = raw_data[2];
- trans_data[1] = raw_data[1];
- trans_data[2] = raw_data[0];
- trans_data[3] = raw_data[3];
- break;
- default:
- trans_data[0] = trans_data[1] = 0;
- trans_data[2] = trans_data[3] = 0;
- 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)
-{
- stbi s;
- start_file(&s, f);
- return tga_load(&s, 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)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return tga_load(&s, x,y,comp,req_comp);
-}
-
-
-// *************************************************************************************************
-// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicholas Schulz, tweaked by STB
-
-static int psd_test(stbi *s)
-{
- if (get32(s) != 0x38425053) return 0; // "8BPS"
- else return 1;
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_psd_test_file(FILE *f)
-{
- stbi s;
- int r,n = ftell(f);
- start_file(&s, f);
- r = psd_test(&s);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-int stbi_psd_test_memory(stbi_uc const *buffer, int len)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return psd_test(&s);
-}
-
-static stbi_uc *psd_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
- int pixelCount;
- int channelCount, compression;
- int channel, i, count, len;
- int w,h;
- uint8_t *out;
-
- // Check identifier
- if (get32(s) != 0x38425053) // "8BPS"
- return epuc("not PSD", "Corrupt PSD image");
-
- // Check file type version.
- if (get16(s) != 1)
- return epuc("wrong version", "Unsupported version of PSD image");
-
- // Skip 6 reserved bytes.
- skip(s, 6 );
-
- // Read the number of channels (R, G, B, A, etc).
- channelCount = get16(s);
- if (channelCount < 0 || channelCount > 16)
- return epuc("wrong channel count", "Unsupported number of channels in PSD image");
-
- // Read the rows and columns of the image.
- h = get32(s);
- w = get32(s);
-
- // Make sure the depth is 8 bits.
- if (get16(s) != 8)
- return epuc("unsupported bit depth", "PSD bit depth is not 8 bit");
-
- // Make sure the color mode is RGB.
- // Valid options are:
- // 0: Bitmap
- // 1: Grayscale
- // 2: Indexed color
- // 3: RGB color
- // 4: CMYK color
- // 7: Multichannel
- // 8: Duotone
- // 9: Lab color
- if (get16(s) != 3)
- return epuc("wrong color format", "PSD is not in RGB color format");
-
- // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.)
- skip(s,get32(s) );
-
- // Skip the image resources. (resolution, pen tool paths, etc)
- skip(s, get32(s) );
-
- // Skip the reserved data.
- skip(s, get32(s) );
-
- // Find out if the data is compressed.
- // Known values:
- // 0: no compression
- // 1: RLE compressed
- compression = get16(s);
- if (compression > 1)
- return epuc("bad compression", "PSD has an unknown compression format");
-
- // Create the destination image.
- out = (stbi_uc *) malloc(4 * w*h);
- if (!out) return epuc("outofmem", "Out of memory");
- pixelCount = w*h;
-
- // Initialize the data to zero.
- //memset( out, 0, pixelCount * 4 );
-
- // Finally, the image data.
- if (compression) {
- // RLE as used by .PSD and .TIFF
- // Loop until you get the number of unpacked bytes you are expecting:
- // Read the next source byte into n.
- // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
- // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
- // Else if n is 128, noop.
- // Endloop
-
- // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
- // which we're going to just skip.
- skip(s, h * channelCount * 2 );
-
- // Read the RLE data by channel.
- for (channel = 0; channel < 4; channel++) {
- uint8_t *p;
-
- p = out+channel;
- if (channel >= channelCount) {
- // Fill this channel with default data.
- for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4;
- } else {
- // Read the RLE data.
- count = 0;
- while (count < pixelCount) {
- len = get8(s);
- if (len == 128) {
- // No-op.
- } else if (len < 128) {
- // Copy next len+1 bytes literally.
- len++;
- count += len;
- while (len) {
- *p = get8(s);
- p += 4;
- len--;
- }
- } else if (len > 128) {
- uint32_t 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(s);
- count += len;
- while (len) {
- *p = val;
- p += 4;
- len--;
- }
- }
- }
- }
- }
-
- } else {
- // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...)
- // where each channel consists of an 8-bit value for each pixel in the image.
-
- // Read the data by channel.
- for (channel = 0; channel < 4; channel++) {
- uint8_t *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(s), p += 4;
- }
- }
- }
-
- if (req_comp && req_comp != 4) {
- out = convert_format(out, 4, req_comp, w, h);
- if (out == NULL) return out; // convert_format frees input on failure
- }
-
- if (comp) *comp = channelCount;
- *y = h;
- *x = w;
-
- return out;
-}
-
-#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)
-{
- stbi s;
- start_file(&s, f);
- return psd_load(&s, 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)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return psd_load(&s, x,y,comp,req_comp);
-}
-
-
-// *************************************************************************************************
-// Radiance RGBE HDR loader
-// originally by Nicolas Schulz
-#ifndef STBI_NO_HDR
-static int hdr_test(stbi *s)
-{
- char *signature = "#?RADIANCE\n";
- int i;
- for (i=0; signature[i]; ++i)
- if (get8(s) != signature[i])
- return 0;
- return 1;
-}
-
-int stbi_hdr_test_memory(stbi_uc const *buffer, int len)
-{
- stbi s;
- start_mem(&s, buffer, len);
- return hdr_test(&s);
-}
-
-#ifndef STBI_NO_STDIO
-int stbi_hdr_test_file(FILE *f)
-{
- stbi s;
- int r,n = ftell(f);
- start_file(&s, f);
- r = hdr_test(&s);
- fseek(f,n,SEEK_SET);
- return r;
-}
-#endif
-
-#define HDR_BUFLEN 1024
-static char *hdr_gettoken(stbi *z, char *buffer)
-{
- int len=0;
- char c = '\2';
-
- c = get8(z);
-
- while (!at_eof(z) && c != '\n') {
- buffer[len++] = c;
- if (len == HDR_BUFLEN-1) {
- // flush to end of line
- while (!at_eof(z) && get8(z) != '\n')
- ;
- break;
- }
- c = get8(z);
- }
-
- buffer[len] = 0;
- return buffer;
-}
-
-static void hdr_convert(float *output, stbi_uc *input, int req_comp)
-{
- if( input[3] != 0 ) {
- float f1;
- // Exponent
- f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
- if (req_comp <= 2)
- output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
- else {
- output[0] = input[0] * f1;
- output[1] = input[1] * f1;
- output[2] = input[2] * f1;
- }
- if (req_comp == 2) output[1] = 1;
- if (req_comp == 4) output[3] = 1;
- } else {
- switch (req_comp) {
- case 4: output[3] = 1; /* fallthrough */
- case 3: output[0] = output[1] = output[2] = 0;
- break;
- case 2: output[1] = 1; /* fallthrough */
- case 1: output[0] = 0;
- break;
- }
- }
-}
-
-
-static float *hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp)
-{
- char buffer[HDR_BUFLEN];
- char *token;
- int valid = 0;
- int width, height;
- stbi_uc *scanline;
- float *hdr_data;
- int len;
- unsigned char count, value;
- int i, j, k, c1,c2, z;
-
-
- // Check identifier
- if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
- return epf("not HDR", "Corrupt HDR image");
-
- // Parse header
- while(1) {
- token = hdr_gettoken(s,buffer);
- if (token[0] == 0) break;
- if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
- }
-
- if (!valid) return epf("unsupported format", "Unsupported HDR format");
-
- // Parse width and height
- // can't use sscanf() if we're not using stdio!
- token = hdr_gettoken(s,buffer);
- if (strncmp(token, "-Y ", 3)) return epf("unsupported data layout", "Unsupported HDR format");
- token += 3;
- height = strtol(token, &token, 10);
- while (*token == ' ') ++token;
- if (strncmp(token, "+X ", 3)) return epf("unsupported data layout", "Unsupported HDR format");
- token += 3;
- width = strtol(token, NULL, 10);
-
- *x = width;
- *y = height;
-
- *comp = 3;
- if (req_comp == 0) req_comp = 3;
-
- // Read data
- hdr_data = (float *) malloc(height * width * req_comp * sizeof(float));
-
- // Load image data
- // image data is stored as some number of sca
- if( width < 8 || width >= 32768) {
- // Read flat data
- for (j=0; j < height; ++j) {
- for (i=0; i < width; ++i) {
- stbi_uc rgbe[4];
- main_decode_loop:
- getn(s, rgbe, 4);
- hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
- }
- }
- } else {
- // Read RLE-encoded data
- scanline = NULL;
-
- for (j = 0; j < height; ++j) {
- c1 = get8(s);
- c2 = get8(s);
- len = get8(s);
- if (c1 != 2 || c2 != 2 || (len & 0x80)) {
- // not run-length encoded, so we have to actually use THIS data as a decoded
- // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
- stbi_uc rgbe[4] = { c1,c2,len, get8(s) };
- 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(s);
- if (len != width) { free(hdr_data); free(scanline); return epf("invalid decoded scanline length", "corrupt HDR"); }
- if (scanline == NULL) scanline = (stbi_uc *) malloc(width * 4);
-
- for (k = 0; k < 4; ++k) {
- i = 0;
- while (i < width) {
- count = get8(s);
- if (count > 128) {
- // Run
- value = get8(s);
- count -= 128;
- for (z = 0; z < count; ++z)
- scanline[i++ * 4 + k] = value;
- } else {
- // Dump
- for (z = 0; z < count; ++z)
- scanline[i++ * 4 + k] = get8(s);
- }
- }
- }
- for (i=0; i < width; ++i)
- hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
- }
- free(scanline);
- }
-
- return hdr_data;
-}
-
-#ifndef STBI_NO_STDIO
-float *stbi_hdr_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
-{
- stbi s;
- start_file(&s,f);
- return hdr_load(&s,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)
-{
- stbi s;
- start_mem(&s,buffer, len);
- return hdr_load(&s,x,y,comp,req_comp);
-}
-
-#endif // STBI_NO_HDR
-
-/////////////////////// write image ///////////////////////
-
-#ifndef STBI_NO_WRITE
-
-static void write8(FILE *f, int x) { uint8_t z = (uint8_t) 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_t x = va_arg(v, int); write8(f,x); break; }
- case '2': { int16_t x = va_arg(v, int); write8(f,x); write8(f,x>>8); break; }
- case '4': { int32_t 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_t bg[3] = { 255, 0, 255}, px[3];
- uint32_t 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_t *d = (uint8_t *) 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
-
-#endif // STBI_HEADER_FILE_ONLY
-
View Lorry Controller Status