sdlxGetSurfaceColorKey function surface

int? sdlxGetSurfaceColorKey(Pointer<SdlSurface> surface)

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

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 false.

\param surface the SDL_Surface structure to query. \param key a pointer filled in with the transparent pixel. \returns true on success or false on failure; call SDL_GetError() for more information.

\threadsafety It is safe to call this function from any thread.

\since This function is available since SDL 3.2.0.

\sa SDL_SetSurfaceColorKey \sa SDL_SurfaceHasColorKey

extern SDL_DECLSPEC bool SDLCALL SDL_GetSurfaceColorKey(SDL_Surface *surface, Uint32 *key)

See also:

• SDL_GetSurfaceColorKey - SDL3 Wiki

Implementation

int? sdlxGetSurfaceColorKey(Pointer<SdlSurface> surface) => ffi.using((arena) {
  final keyPointer = arena<Uint32>();

  if (!sdlGetSurfaceColorKey(surface, keyPointer)) {
    return null;
  }

  return keyPointer.value;
});