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Added support for XV thumbnail images
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| /* | ||
| SDL_image: An example image loading library for use with SDL | ||
| Copyright (C) 1999-2004 Sam Lantinga | ||
| 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 | ||
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| Sam Lantinga | ||
| slouken@libsdl.org | ||
| */ | ||
|
|
||
| /* $Id$ */ | ||
|
|
||
| /* This is a generic "format not supported" image framework */ | ||
|
|
||
| #include <stdio.h> | ||
| #include <string.h> | ||
|
|
||
| #include "SDL_image.h" | ||
|
|
||
| #ifdef LOAD_XV | ||
|
|
||
| static int get_line(SDL_RWops *src, char *line, int size) | ||
| { | ||
| while ( size > 0 ) { | ||
| if ( SDL_RWread(src, line, 1, 1) <= 0 ) { | ||
| return -1; | ||
| } | ||
| if ( *line == '\r' ) { | ||
| continue; | ||
| } | ||
| if ( *line == '\n' ) { | ||
| *line = '\0'; | ||
| return 0; | ||
| } | ||
| ++line; | ||
| --size; | ||
| } | ||
| /* Out of space for the line */ | ||
| return -1; | ||
| } | ||
|
|
||
| static int get_header(SDL_RWops *src, int *w, int *h) | ||
| { | ||
| char line[1024]; | ||
|
|
||
| *w = 0; | ||
| *h = 0; | ||
|
|
||
| /* Check the header magic */ | ||
| if ( (get_line(src, line, sizeof(line)) < 0) || | ||
| (memcmp(line, "P7 332", 6) != 0) ) { | ||
| return -1; | ||
| } | ||
|
|
||
| /* Read the header */ | ||
| while ( get_line(src, line, sizeof(line)) == 0 ) { | ||
| if ( memcmp(line, "#BUILTIN:", 9) == 0 ) { | ||
| /* Builtin image, no data */ | ||
| break; | ||
| } | ||
| if ( memcmp(line, "#END_OF_COMMENTS", 16) == 0 ) { | ||
| if ( get_line(src, line, sizeof(line)) == 0 ) { | ||
| sscanf(line, "%d %d", w, h); | ||
| if ( *w >= 0 && *h >= 0 ) { | ||
| return 0; | ||
| } | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| /* No image data */ | ||
| return -1; | ||
| } | ||
|
|
||
| /* See if an image is contained in a data source */ | ||
| int IMG_isXV(SDL_RWops *src) | ||
| { | ||
| int start; | ||
| int is_XV; | ||
| int w, h; | ||
|
|
||
| start = SDL_RWtell(src); | ||
| is_XV = 0; | ||
| if ( get_header(src, &w, &h) == 0 ) { | ||
| is_XV = 1; | ||
| } | ||
| SDL_RWseek(src, start, SEEK_SET); | ||
| return(is_XV); | ||
| } | ||
|
|
||
| /* Load a XV thumbnail image from an SDL datasource */ | ||
| SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src) | ||
| { | ||
| int start; | ||
| const char *error = NULL; | ||
| SDL_Surface *surface = NULL; | ||
| int w, h; | ||
| Uint8 *pixels; | ||
|
|
||
| if ( !src ) { | ||
| /* The error message has been set in SDL_RWFromFile */ | ||
| return NULL; | ||
| } | ||
| start = SDL_RWtell(src); | ||
|
|
||
| /* Read the header */ | ||
| if ( get_header(src, &w, &h) < 0 ) { | ||
| error = "Unsupported image format"; | ||
| goto done; | ||
| } | ||
|
|
||
| /* Create the 3-3-2 indexed palette surface */ | ||
| surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 8, 0xe0, 0x1c, 0x03, 0); | ||
| if ( surface == NULL ) { | ||
| error = "Out of memory"; | ||
| goto done; | ||
| } | ||
|
|
||
| /* Load the image data */ | ||
| for ( pixels = (Uint8 *)surface->pixels; h > 0; --h ) { | ||
| if ( SDL_RWread(src, pixels, w, 1) <= 0 ) { | ||
| error = "Couldn't read image data"; | ||
| goto done; | ||
| } | ||
| pixels += surface->pitch; | ||
| } | ||
|
|
||
| done: | ||
| if ( error ) { | ||
| SDL_RWseek(src, start, SEEK_SET); | ||
| if ( surface ) { | ||
| SDL_FreeSurface(surface); | ||
| surface = NULL; | ||
| } | ||
| IMG_SetError(error); | ||
| } | ||
| return surface; | ||
| } | ||
|
|
||
| #else | ||
|
|
||
| /* See if an image is contained in a data source */ | ||
| int IMG_isXV(SDL_RWops *src) | ||
| { | ||
| return(0); | ||
| } | ||
|
|
||
| /* Load a XXX type image from an SDL datasource */ | ||
| SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src) | ||
| { | ||
| return(NULL); | ||
| } | ||
|
|
||
| #endif /* LOAD_XV */ |
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