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)
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