SDL_SetColorKey — Sets the color key (transparent pixel) in a blittable surface and RLE acceleration.
#include "SDL.h"
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 blit acceleration.
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 a blit.
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.
SDL_BlitSurface(3), SDL_DisplayFormat(3), SDL_MapRGB(3), SDL_SetAlpha(3)
| COPYRIGHT |
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This manual page is taken from the SDL library, licensed under GNU LGPL. |