CentOS 7.0 - man page for sdl_displayformatalpha (centos section 3)

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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 col-
       ors of the video framebuffer plus an alpha channel, suitable for fast  blitting	onto  the
       display surface. It calls SDL_ConvertSurface

       If  you want to take advantage of hardware colorkey or alpha blit acceleration, 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_SRCCOL-
       ORKEY flag is set on the surface. The generated surface 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)
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