Uint32 getpixel(SDL_Surface *surface, int x, int y);
void putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel);
void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b);
Uint32 getpixel(SDL_Surface *surface, int x, int y);
void putpixel(SDL_Surface *surface, int x, int y, Uint32 pixel);
void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b);