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SDL_SetColorKey(3) SDL API Reference SDL_SetColorKey(3)
SDL_SetColorKey- Sets the color key (transparent pixel) in a blittable surface and RLE
int SDL_SetColorKey(SDL_Surface *surface, Uint32 flag, Uint32 key);
Sets the color key (transparent pixel) in a blittable surface and enables or disables RLE
RLE acceleration can substantially speed up blitting of images with large horizontal runs
of transparent pixels (i.e., pixels that match the key value). The key must be of the same
pixel format as the surface, SDL_MapRGB is often useful for obtaining an acceptable value.
If flag is SDL_SRCCOLORKEY then key is the transparent pixel value in the source image of
If flag is OR'd with SDL_RLEACCEL then the surface will be draw using RLE acceleration
when drawn with SDL_BlitSurface. The surface will actually be encoded for RLE acceleration
the first time SDL_BlitSurface or SDL_DisplayFormat is called on the surface.
If flag is 0, this function clears any current color key.
This function returns 0, or -1 if there was an error.
SDL_BlitSurface, SDL_DisplayFormat, SDL_MapRGB, SDL_SetAlpha
SDL Tue 11 Sep 2001, 23:01 SDL_SetColorKey(3)
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