SDL_Surface *TCOD_sys_read_png(const char *filename) {
unsigned error;
unsigned char* image;
unsigned width, height, y, bpp;
unsigned char* png;
size_t pngsize;
LodePNGState state;
SDL_Surface *bitmap;
unsigned char *source;
unsigned int rowsize;
lodepng_state_init(&state);
/*optionally customize the state*/
if (!TCOD_sys_read_file(filename,&png,&pngsize)) return NULL;
lodepng_inspect(&width,&height,&state, png, pngsize);
bpp=lodepng_get_bpp(&state.info_png.color);
if ( bpp == 24 ) {
/* don't convert to 32 bits because libtcod's 24bits renderer is faster */
state.info_raw.colortype=LCT_RGB;
} else if ( bpp != 24 && bpp != 32 ) {
/* paletted png. convert to 24 bits */
state.info_raw.colortype=LCT_RGB;
state.info_raw.bitdepth=8;
bpp=24;
}
error = lodepng_decode(&image, &width, &height, &state, png, pngsize);
free(png);
if(error) {
printf("error %u: %s\n", error, lodepng_error_text(error));
lodepng_state_cleanup(&state);
return NULL;
}
/* create the SDL surface */
bitmap=TCOD_sys_get_surface(width,height,bpp==32);
source=image;
rowsize=width*bpp/8;
for (y=0; y< height; y++ ) {
Uint8 *row_pointer=(Uint8 *)(bitmap->pixels) + y * bitmap->pitch;
memcpy(row_pointer,source,rowsize);
source+=rowsize;
}
lodepng_state_cleanup(&state);
free(image);
return bitmap;
}
bool TCODSystem::readFile(const char *filename, unsigned char **buf, uint32 *size) {
return TCOD_sys_read_file(filename,buf,size) != 0;
}
