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_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_SRCCOLORKEY 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