167 lines
3.5 KiB
C
167 lines
3.5 KiB
C
/*
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SDL_image: An example image loading library for use with SDL
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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/* This is a XV thumbnail image file loading framework */
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#include <stdio.h>
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#include <string.h>
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#include "SDL_image.h"
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#ifdef LOAD_XV
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static int get_line(SDL_RWops *src, char *line, int size)
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{
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while ( size > 0 ) {
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if ( SDL_RWread(src, line, 1, 1) <= 0 ) {
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return -1;
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}
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if ( *line == '\r' ) {
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continue;
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}
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if ( *line == '\n' ) {
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*line = '\0';
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return 0;
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}
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++line;
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--size;
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}
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/* Out of space for the line */
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return -1;
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}
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static int get_header(SDL_RWops *src, int *w, int *h)
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{
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char line[1024];
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*w = 0;
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*h = 0;
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/* Check the header magic */
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if ( (get_line(src, line, sizeof(line)) < 0) ||
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(memcmp(line, "P7 332", 6) != 0) ) {
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return -1;
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}
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/* Read the header */
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while ( get_line(src, line, sizeof(line)) == 0 ) {
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if ( memcmp(line, "#BUILTIN:", 9) == 0 ) {
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/* Builtin image, no data */
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break;
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}
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if ( memcmp(line, "#END_OF_COMMENTS", 16) == 0 ) {
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if ( get_line(src, line, sizeof(line)) == 0 ) {
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sscanf(line, "%d %d", w, h);
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if ( *w >= 0 && *h >= 0 ) {
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return 0;
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}
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}
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break;
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}
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}
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/* No image data */
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return -1;
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}
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/* See if an image is contained in a data source */
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int IMG_isXV(SDL_RWops *src)
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{
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int start;
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int is_XV;
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int w, h;
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if ( !src )
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return 0;
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start = SDL_RWtell(src);
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is_XV = 0;
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if ( get_header(src, &w, &h) == 0 ) {
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is_XV = 1;
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}
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SDL_RWseek(src, start, RW_SEEK_SET);
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return(is_XV);
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}
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/* Load a XV thumbnail image from an SDL datasource */
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SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src)
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{
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int start;
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const char *error = NULL;
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SDL_Surface *surface = NULL;
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int w, h;
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Uint8 *pixels;
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if ( !src ) {
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/* The error message has been set in SDL_RWFromFile */
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return NULL;
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}
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start = SDL_RWtell(src);
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/* Read the header */
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if ( get_header(src, &w, &h) < 0 ) {
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error = "Unsupported image format";
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goto done;
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}
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/* Create the 3-3-2 indexed palette surface */
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surface = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 8, 0xe0, 0x1c, 0x03, 0);
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if ( surface == NULL ) {
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error = "Out of memory";
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goto done;
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}
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/* Load the image data */
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for ( pixels = (Uint8 *)surface->pixels; h > 0; --h ) {
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if ( SDL_RWread(src, pixels, w, 1) <= 0 ) {
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error = "Couldn't read image data";
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goto done;
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}
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pixels += surface->pitch;
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}
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done:
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if ( error ) {
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SDL_RWseek(src, start, RW_SEEK_SET);
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if ( surface ) {
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SDL_FreeSurface(surface);
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surface = NULL;
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}
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IMG_SetError(error);
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}
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return surface;
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}
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#else
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/* See if an image is contained in a data source */
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int IMG_isXV(SDL_RWops *src)
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{
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return(0);
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}
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/* Load a XXX type image from an SDL datasource */
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SDL_Surface *IMG_LoadXV_RW(SDL_RWops *src)
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{
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return(NULL);
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}
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#endif /* LOAD_XV */
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