SDL_SetColorKey
Use this function to set the color key (transparent pixel) in a surface.
Contents
Syntax
int SDL_SetColorKey(SDL_Surface* surface,
int flag,
Uint32 key)
Function Parameters
surface |
the SDL_Surface structure to update |
flag |
SDL_TRUE to enable color key, SDL_FALSE to disable color key |
key |
the transparent pixel |
Return Value
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
Code Examples
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Remarks
The color key defines a pixel value that will be treated as transparent in a blit. It is a pixel of the format used by the surface, as generated by SDL_MapRGB().
RLE acceleration can substantially speed up blitting of images with large horizontal runs of transparent pixels. See SDL_SetSurfaceRLE() for details.
