// example
// loads a PNG file an into SDL surface, and then writes it back to a PNG file.
int main(int argc, char **argv)
{
SDL_Surface *input_surf;
char *input, *output, *str_ptr;
int namelen;
/* Parsing shell parameters */
if (argc == 3) {
input = argv[1];
output = argv[2];
}
else if (argc == 2) {
input = argv[1];
str_ptr = strstr(argv[1], ".");
if (str_ptr == NULL)
namelen = strlen(argv[1]);
else
namelen = str_ptr - argv[1];
output = (char *)malloc(namelen + 5);
strncpy(output, argv[1], namelen);
strcat(output, ".png");
}
else {
printf("The correct syntax is: %s input [output]\n", argv[0]);
exit(-1);
}
/* Initializing video subsystem */
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("SDL_Init error: %s\n", SDL_GetError());
exit (-1);
}
/* Calling SDL_Quit at exit */
atexit(SDL_Quit);
printf("input file: %s\n", input);
printf("output file: %s\n", output);
/* Opening input and output files */
input_surf = IMG_Load(input);
if (input_surf == NULL) {
printf("IMG_Load error: %s\n", IMG_GetError());
exit(-1);
}
if(png_save_surface(output, input_surf) < 0);
exit(-1);
/* Quitting */
if (argc == 2)
free(output);
SDL_Quit();
return 0;
}
void SaveScreenshot()
{
char Filename[52];
SDL_Rect viewport;
SDL_Surface* surface;
Screenshot::GenerateName( Filename );
if( Filename[0] == '\0' ){
stat("Can not get screenshot name. Too many screenshots in folder");
return;
}
SDL_RenderGetViewport(renderer, &viewport);
surface = SDL_CreateRGBSurface(0, viewport.w, viewport.h, 24,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
#else
0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
#endif
);
if (!surface)
{
stat("Couldn't create surface: %s\n", SDL_GetError());
return;
}
if ( SDL_RenderReadPixels(renderer, NULL, surface->format->format, surface->pixels, surface->pitch) < 0 )
{
stat("Couldn't read screen: %s\n", SDL_GetError());
return;
}
if( png_save_surface(Filename, surface) < 0 ){
SDL_FreeSurface( surface );
return;
}
SDL_FreeSurface( surface );
return;
}
