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SDL_DisplayFormatAlpha(3)      SDL API Reference     SDL_DisplayFormatAlpha(3)

NAME
       SDL_DisplayFormatAlpha -	Convert	a surface to the display format

SYNOPSIS
       #include	"SDL.h"

       SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface);

DESCRIPTION
       This  function  takes  a	 surface and copies it to a new	surface	of the
       pixel format and	colors of the video framebuffer	plus an	alpha channel,
       suitable	 for fast blitting onto	the display surface. It	calls SDL_Con-
       vertSurface

       If you want to take advantage of	hardware colorkey or alpha blit	accel-
       eration,	 you  should  set  the colorkey	and alpha value	before calling
       this function.

       This function can be used to convert a colourkey	to an  alpha  channel,
       if  the	SDL_SRCCOLORKEY	flag is	set on the surface. The	generated sur-
       face will then be transparent (alpha=0)	where  the  pixels  match  the
       colourkey, and opaque (alpha=255) elsewhere.

RETURN VALUE
       If the conversion fails or runs out of memory, it returns NULL

SEE ALSO
       SDL_ConvertSurface,  SDL_SetAlpha,  SDL_SetColorKey, SDL_DisplayFormat,
       SDL_Surface

SDL			    Tue	11 Sep 2001, 23:01   SDL_DisplayFormatAlpha(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO

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