1SDL_DisplayFormatAlpha(3)      SDL API Reference     SDL_DisplayFormatAlpha(3)
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NAME

6       SDL_DisplayFormatAlpha - Convert a surface to the display format
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SYNOPSIS

9       #include "SDL.h"
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11       SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface);
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DESCRIPTION

14       This  function  takes  a  surface and copies it to a new surface of the
15       pixel format and colors of the video framebuffer plus an alpha channel,
16       suitable  for fast blitting onto the display surface. It calls SDL_Con‐
17       vertSurface
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19       If you want to take advantage of hardware colorkey or alpha blit accel‐
20       eration,  you  should  set  the colorkey and alpha value before calling
21       this function.
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23       This function can be used to convert a colourkey to an  alpha  channel,
24       if  the  SDL_SRCCOLORKEY flag is set on the surface. The generated sur‐
25       face will then be transparent (alpha=0)  where  the  pixels  match  the
26       colourkey, and opaque (alpha=255) elsewhere.
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RETURN VALUE

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

32       SDL_ConvertSurface,  SDL_SetAlpha,  SDL_SetColorKey, SDL_DisplayFormat,
33       SDL_Surface
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37SDL                         Tue 11 Sep 2001, 23:01   SDL_DisplayFormatAlpha(3)
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