SDL_DisplayFormatAlpha man page on JazzOS

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SDL_DisplayFormatAlpha(3)      SDL API Reference     SDL_DisplayFormatAlpha(3)

       SDL_DisplayFormatAlpha - Convert a surface to the display format

       #include "SDL.h"

       SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface);

       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‐

       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.

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

       SDL_ConvertSurface,  SDL_SetAlpha,  SDL_SetColorKey, SDL_DisplayFormat,

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

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