opensolaris man page for sdl_setcolorkey

SDL_SetColorKey(3)						 SDL API Reference						SDL_SetColorKey(3)

NAME
       SDL_SetColorKey - Sets the color key (transparent pixel) in a blittable surface and RLE acceleration.

SYNOPSIS
       #include "SDL.h"

       int SDL_SetColorKey(SDL_Surface *surface, Uint32 flag, Uint32 key);

DESCRIPTION
	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.

RETURN VALUE
       This function returns 0, or -1 if there was an error.

SEE ALSO
       SDL_BlitSurface, SDL_DisplayFormat, SDL_MapRGB, SDL_SetAlpha

SDL
							      Tue 11 Sep 2001, 23:01						SDL_SetColorKey(3)