SDL_SetAlpha     744 src/video/SDL_surface.c          SDL_SetAlpha(surface, 0, 0);
SDL_SetAlpha     772 src/video/SDL_surface.c                  SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK),
SDL_SetAlpha     775 src/video/SDL_surface.c          SDL_SetAlpha(surface, aflags, alpha);
SDL_SetAlpha      97 test/testalpha.c         SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0);
SDL_SetAlpha     245 test/testalpha.c         SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel));