Get the additional color value multiplied into blit operations.
Defined in SDL_surface.h
int SDL_GetSurfaceColorMod(SDL_Surface * surface,
                           Uint8 * r, Uint8 * g,
                           Uint8 * b);| SDL_Surface * | surface | the SDL_Surface structure to query. | 
| Uint8 * | r | a pointer filled in with the current red color value. | 
| Uint8 * | g | a pointer filled in with the current green color value. | 
| Uint8 * | b | a pointer filled in with the current blue color value. | 
(int) Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
This function is available since SDL 2.0.0.