--- a/cocoaTouch/otherSrc/IMG_png.c Mon Apr 19 15:30:11 2010 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,502 +0,0 @@
-/*
- SDL_image: An example image loading library for use with SDL
- Copyright (C) 1997-2009 Sam Lantinga
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
- Sam Lantinga
- slouken@libsdl.org
-*/
-
-/* This is a PNG image file loading framework */
-
-#include <stdlib.h>
-#include <stdio.h>
-
-#include "SDL_image.h"
-
-
-/*=============================================================================
- File: SDL_png.c
- Purpose: A PNG loader and saver for the SDL library
- Revision:
- Created by: Philippe Lavoie (2 November 1998)
- lavoie@zeus.genie.uottawa.ca
- Modified by:
-
- Copyright notice:
- Copyright (C) 1998 Philippe Lavoie
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Comments: The load and save routine are basically the ones you can find
- in the example.c file from the libpng distribution.
-
- Changes:
- 5/17/99 - Modified to use the new SDL data sources - Sam Lantinga
-
-=============================================================================*/
-
-#include "SDL_endian.h"
-
-#ifdef macintosh
-#define MACOS
-#endif
-#include "png.h"
-
-
-static struct {
- int loaded;
- void *handle;
- png_infop (*png_create_info_struct) (png_structp png_ptr);
- png_structp (*png_create_read_struct) (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn);
- void (*png_destroy_read_struct) (png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr);
- png_uint_32 (*png_get_IHDR) (png_structp png_ptr, png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_method, int *compression_method, int *filter_method);
- png_voidp (*png_get_io_ptr) (png_structp png_ptr);
- png_uint_32 (*png_get_tRNS) (png_structp png_ptr, png_infop info_ptr, png_bytep *trans, int *num_trans, png_color_16p *trans_values);
- png_uint_32 (*png_get_valid) (png_structp png_ptr, png_infop info_ptr, png_uint_32 flag);
- void (*png_read_image) (png_structp png_ptr, png_bytepp image);
- void (*png_read_info) (png_structp png_ptr, png_infop info_ptr);
- void (*png_read_update_info) (png_structp png_ptr, png_infop info_ptr);
- void (*png_set_expand) (png_structp png_ptr);
- void (*png_set_gray_to_rgb) (png_structp png_ptr);
- void (*png_set_packing) (png_structp png_ptr);
- void (*png_set_read_fn) (png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn);
- void (*png_set_strip_16) (png_structp png_ptr);
- int (*png_sig_cmp) (png_bytep sig, png_size_t start, png_size_t num_to_check);
-} lib;
-
-#ifdef LOAD_PNG_DYNAMIC
-int IMG_InitPNG()
-{
- if ( lib.loaded == 0 ) {
- lib.handle = SDL_LoadObject(LOAD_PNG_DYNAMIC);
- if ( lib.handle == NULL ) {
- return -1;
- }
- lib.png_create_info_struct =
- (png_infop (*) (png_structp))
- SDL_LoadFunction(lib.handle, "png_create_info_struct");
- if ( lib.png_create_info_struct == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_create_read_struct =
- (png_structp (*) (png_const_charp, png_voidp, png_error_ptr, png_error_ptr))
- SDL_LoadFunction(lib.handle, "png_create_read_struct");
- if ( lib.png_create_read_struct == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_destroy_read_struct =
- (void (*) (png_structpp, png_infopp, png_infopp))
- SDL_LoadFunction(lib.handle, "png_destroy_read_struct");
- if ( lib.png_destroy_read_struct == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_get_IHDR =
- (png_uint_32 (*) (png_structp, png_infop, png_uint_32 *, png_uint_32 *, int *, int *, int *, int *, int *))
- SDL_LoadFunction(lib.handle, "png_get_IHDR");
- if ( lib.png_get_IHDR == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_get_io_ptr =
- (png_voidp (*) (png_structp))
- SDL_LoadFunction(lib.handle, "png_get_io_ptr");
- if ( lib.png_get_io_ptr == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_get_tRNS =
- (png_uint_32 (*) (png_structp, png_infop, png_bytep *, int *, png_color_16p *))
- SDL_LoadFunction(lib.handle, "png_get_tRNS");
- if ( lib.png_get_tRNS == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_get_valid =
- (png_uint_32 (*) (png_structp, png_infop, png_uint_32))
- SDL_LoadFunction(lib.handle, "png_get_valid");
- if ( lib.png_get_valid == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_read_image =
- (void (*) (png_structp, png_bytepp))
- SDL_LoadFunction(lib.handle, "png_read_image");
- if ( lib.png_read_image == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_read_info =
- (void (*) (png_structp, png_infop))
- SDL_LoadFunction(lib.handle, "png_read_info");
- if ( lib.png_read_info == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_read_update_info =
- (void (*) (png_structp, png_infop))
- SDL_LoadFunction(lib.handle, "png_read_update_info");
- if ( lib.png_read_update_info == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_set_expand =
- (void (*) (png_structp))
- SDL_LoadFunction(lib.handle, "png_set_expand");
- if ( lib.png_set_expand == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_set_gray_to_rgb =
- (void (*) (png_structp))
- SDL_LoadFunction(lib.handle, "png_set_gray_to_rgb");
- if ( lib.png_set_gray_to_rgb == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_set_packing =
- (void (*) (png_structp))
- SDL_LoadFunction(lib.handle, "png_set_packing");
- if ( lib.png_set_packing == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_set_read_fn =
- (void (*) (png_structp, png_voidp, png_rw_ptr))
- SDL_LoadFunction(lib.handle, "png_set_read_fn");
- if ( lib.png_set_read_fn == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_set_strip_16 =
- (void (*) (png_structp))
- SDL_LoadFunction(lib.handle, "png_set_strip_16");
- if ( lib.png_set_strip_16 == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- lib.png_sig_cmp =
- (int (*) (png_bytep, png_size_t, png_size_t))
- SDL_LoadFunction(lib.handle, "png_sig_cmp");
- if ( lib.png_sig_cmp == NULL ) {
- SDL_UnloadObject(lib.handle);
- return -1;
- }
- }
- ++lib.loaded;
-
- return 0;
-}
-void IMG_QuitPNG()
-{
- if ( lib.loaded == 0 ) {
- return;
- }
- if ( lib.loaded == 1 ) {
- SDL_UnloadObject(lib.handle);
- }
- --lib.loaded;
-}
-#else
-int IMG_InitPNG()
-{
- if ( lib.loaded == 0 ) {
- lib.png_create_info_struct = png_create_info_struct;
- lib.png_create_read_struct = png_create_read_struct;
- lib.png_destroy_read_struct = png_destroy_read_struct;
- lib.png_get_IHDR = png_get_IHDR;
- lib.png_get_io_ptr = png_get_io_ptr;
- lib.png_get_tRNS = png_get_tRNS;
- lib.png_get_valid = png_get_valid;
- lib.png_read_image = png_read_image;
- lib.png_read_info = png_read_info;
- lib.png_read_update_info = png_read_update_info;
- lib.png_set_expand = png_set_expand;
- lib.png_set_gray_to_rgb = png_set_gray_to_rgb;
- lib.png_set_packing = png_set_packing;
- lib.png_set_read_fn = png_set_read_fn;
- lib.png_set_strip_16 = png_set_strip_16;
- lib.png_sig_cmp = png_sig_cmp;
- }
- ++lib.loaded;
-
- return 0;
-}
-void IMG_QuitPNG()
-{
- if ( lib.loaded == 0 ) {
- return;
- }
- if ( lib.loaded == 1 ) {
- }
- --lib.loaded;
-}
-#endif /* LOAD_PNG_DYNAMIC */
-
-/* See if an image is contained in a data source */
-int IMG_isPNG(SDL_RWops *src)
-{
- int start;
- int is_PNG;
- Uint8 magic[4];
-
- if ( !src )
- return 0;
- start = SDL_RWtell(src);
- is_PNG = 0;
- if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) {
- if ( magic[0] == 0x89 &&
- magic[1] == 'P' &&
- magic[2] == 'N' &&
- magic[3] == 'G' ) {
- is_PNG = 1;
- }
- }
- SDL_RWseek(src, start, RW_SEEK_SET);
- return(is_PNG);
-}
-
-/* Load a PNG type image from an SDL datasource */
-static void png_read_data(png_structp ctx, png_bytep area, png_size_t size)
-{
- SDL_RWops *src;
-
- src = (SDL_RWops *)lib.png_get_io_ptr(ctx);
- SDL_RWread(src, area, size, 1);
-}
-SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src)
-{
- int start;
- const char *error;
- SDL_Surface *volatile surface;
- png_structp png_ptr;
- png_infop info_ptr;
- png_uint_32 width, height;
- int bit_depth, color_type, interlace_type;
- Uint32 Rmask;
- Uint32 Gmask;
- Uint32 Bmask;
- Uint32 Amask;
- SDL_Palette *palette;
- png_bytep *volatile row_pointers;
- int row, i;
- volatile int ckey = -1;
- png_color_16 *transv;
-
- if ( !src ) {
- /* The error message has been set in SDL_RWFromFile */
- return NULL;
- }
- start = SDL_RWtell(src);
-
- if ( !IMG_Init(IMG_INIT_PNG) ) {
- return NULL;
- }
-
- /* Initialize the data we will clean up when we're done */
- error = NULL;
- png_ptr = NULL; info_ptr = NULL; row_pointers = NULL; surface = NULL;
-
- /* Create the PNG loading context structure */
- png_ptr = lib.png_create_read_struct(PNG_LIBPNG_VER_STRING,
- NULL,NULL,NULL);
- if (png_ptr == NULL){
- error = "Couldn't allocate memory for PNG file or incompatible PNG dll";
- goto done;
- }
-
- /* Allocate/initialize the memory for image information. REQUIRED. */
- info_ptr = lib.png_create_info_struct(png_ptr);
- if (info_ptr == NULL) {
- error = "Couldn't create image information for PNG file";
- goto done;
- }
-
- /* Set error handling if you are using setjmp/longjmp method (this is
- * the normal method of doing things with libpng). REQUIRED unless you
- * set up your own error handlers in png_create_read_struct() earlier.
- */
- if ( setjmp(png_ptr->jmpbuf) ) {
- error = "Error reading the PNG file.";
- goto done;
- }
-
- /* Set up the input control */
- lib.png_set_read_fn(png_ptr, src, png_read_data);
-
- /* Read PNG header info */
- lib.png_read_info(png_ptr, info_ptr);
- lib.png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
- &color_type, &interlace_type, NULL, NULL);
-
- /* tell libpng to strip 16 bit/color files down to 8 bits/color */
- lib.png_set_strip_16(png_ptr) ;
-
- /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
- * byte into separate bytes (useful for paletted and grayscale images).
- */
- lib.png_set_packing(png_ptr);
-
- /* scale greyscale values to the range 0..255 */
- if(color_type == PNG_COLOR_TYPE_GRAY)
- lib.png_set_expand(png_ptr);
-
- /* For images with a single "transparent colour", set colour key;
- if more than one index has transparency, or if partially transparent
- entries exist, use full alpha channel */
- if (lib.png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
- int num_trans;
- Uint8 *trans;
- lib.png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans,
- &transv);
- if(color_type == PNG_COLOR_TYPE_PALETTE) {
- /* Check if all tRNS entries are opaque except one */
- int t = -1;
- for(i = 0; i < num_trans; i++)
- if(trans[i] == 0) {
- if(t >= 0)
- break;
- t = i;
- } else if(trans[i] != 255)
- break;
- if(i == num_trans) {
- /* exactly one transparent index */
- ckey = t;
- } else {
- /* more than one transparent index, or translucency */
- lib.png_set_expand(png_ptr);
- }
- } else
- ckey = 0; /* actual value will be set later */
- }
-
- if ( color_type == PNG_COLOR_TYPE_GRAY_ALPHA )
- lib.png_set_gray_to_rgb(png_ptr);
-
- lib.png_read_update_info(png_ptr, info_ptr);
-
- lib.png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
- &color_type, &interlace_type, NULL, NULL);
-
- /* Allocate the SDL surface to hold the image */
- Rmask = Gmask = Bmask = Amask = 0 ;
- if ( color_type != PNG_COLOR_TYPE_PALETTE ) {
- if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) {
- Rmask = 0x000000FF;
- Gmask = 0x0000FF00;
- Bmask = 0x00FF0000;
- Amask = (info_ptr->channels == 4) ? 0xFF000000 : 0;
- } else {
- int s = (info_ptr->channels == 4) ? 0 : 8;
- Rmask = 0xFF000000 >> s;
- Gmask = 0x00FF0000 >> s;
- Bmask = 0x0000FF00 >> s;
- Amask = 0x000000FF >> s;
- }
- }
- surface = SDL_AllocSurface(SDL_SWSURFACE, width, height,
- bit_depth*info_ptr->channels, Rmask,Gmask,Bmask,Amask);
- if ( surface == NULL ) {
- error = "Out of memory";
- goto done;
- }
-
- if(ckey != -1) {
- if(color_type != PNG_COLOR_TYPE_PALETTE)
- /* FIXME: Should these be truncated or shifted down? */
- ckey = SDL_MapRGB(surface->format,
- (Uint8)transv->red,
- (Uint8)transv->green,
- (Uint8)transv->blue);
- SDL_SetColorKey(surface, SDL_SRCCOLORKEY, ckey);
- }
-
- /* Create the array of pointers to image data */
- row_pointers = (png_bytep*) malloc(sizeof(png_bytep)*height);
- if ( (row_pointers == NULL) ) {
- error = "Out of memory";
- goto done;
- }
- for (row = 0; row < (int)height; row++) {
- row_pointers[row] = (png_bytep)
- (Uint8 *)surface->pixels + row*surface->pitch;
- }
-
- /* Read the entire image in one go */
- lib.png_read_image(png_ptr, row_pointers);
-
- /* and we're done! (png_read_end() can be omitted if no processing of
- * post-IDAT text/time/etc. is desired)
- * In some cases it can't read PNG's created by some popular programs (ACDSEE),
- * we do not want to process comments, so we omit png_read_end
-
- lib.png_read_end(png_ptr, info_ptr);
- */
-
- /* Load the palette, if any */
- palette = surface->format->palette;
- if ( palette ) {
- if(color_type == PNG_COLOR_TYPE_GRAY) {
- palette->ncolors = 256;
- for(i = 0; i < 256; i++) {
- palette->colors[i].r = i;
- palette->colors[i].g = i;
- palette->colors[i].b = i;
- }
- } else if (info_ptr->num_palette > 0 ) {
- palette->ncolors = info_ptr->num_palette;
- for( i=0; i<info_ptr->num_palette; ++i ) {
- palette->colors[i].b = info_ptr->palette[i].blue;
- palette->colors[i].g = info_ptr->palette[i].green;
- palette->colors[i].r = info_ptr->palette[i].red;
- }
- }
- }
-
-done: /* Clean up and return */
- if ( png_ptr ) {
- lib.png_destroy_read_struct(&png_ptr,
- info_ptr ? &info_ptr : (png_infopp)0,
- (png_infopp)0);
- }
- if ( row_pointers ) {
- free(row_pointers);
- }
- if ( error ) {
- SDL_RWseek(src, start, RW_SEEK_SET);
- if ( surface ) {
- SDL_FreeSurface(surface);
- surface = NULL;
- }
- IMG_SetError(error);
- }
- return(surface);
-}