# SDL_SurfaceHasColorKey Returns whether the surface has a color key. ## Header File Defined in [<SDL3/SDL_surface.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_surface.h) ## Syntax ```c bool SDL_SurfaceHasColorKey(SDL_Surface *surface); ``` ## Function Parameters | | | | | ---------------------------- | ----------- | -------------------------------------------------- | | [SDL_Surface](SDL_Surface) * | **surface** | the [SDL_Surface](SDL_Surface) structure to query. | ## Return Value (bool) Returns true if the surface has a color key, false otherwise. ## Remarks It is safe to pass a NULL `surface` here; it will return false. ## Thread Safety It is safe to call this function from any thread. ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_SetSurfaceColorKey](SDL_SetSurfaceColorKey) - [SDL_GetSurfaceColorKey](SDL_GetSurfaceColorKey) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategorySurface](CategorySurface)