SDL intro رو گوگل کن
فکر کنم توی مخازن اوبونتو هم example داشته باشه
initialize:
{ SDL_Surface *screen;
    screen = SDL_SetVideoMode(640, 480, 16, SDL_SWSURFACE);
    if ( screen == NULL ) {
        fprintf(stderr, "Unable to set 640x480 video: %s\n", SDL_GetError());
        exit(1);
    }
}
Blit image:
void ShowBMP(char *file, SDL_Surface *screen, int x, int y)
{
    SDL_Surface *image;
    SDL_Rect dest;
    /* Load the BMP file into a surface */
    image = SDL_LoadBMP(file);
    if ( image == NULL ) {
        fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());
        return;
    }
    /* Blit onto the screen surface.
       The surfaces should not be locked at this point.
     */
    dest.x = x;
    dest.y = y;
    dest.w = image->w;
    dest.h = image->h;
    SDL_BlitSurface(image, NULL, screen, &dest);
    /* Update the changed portion of the screen */
    SDL_UpdateRects(screen, 1, &dest);
}