SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)


Get the color key (transparent pixel) for a surface.


int SDL_GetColorKey(SDL_Surface * surface,
                    Uint32 * key);

Function Parameters

surface the SDL_Surface structure to query
key a pointer filled in with the transparent pixel

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.


The color key is a pixel of the format used by the surface, as generated by SDL_MapRGB().

If the surface doesn't have color key enabled this function returns -1.


This function is available since SDL 2.0.0.


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