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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 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 accelera- tion, you should set the colorkey and alpha value before calling this func- tion. 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 SDL Tue 11 Sep 2001, 23:01 SDL_DisplayFormatAlpha(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
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