(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_PremultiplySurfaceAlpha

Premultiply the alpha in a surface.

Header File

Defined in <SDL3/SDL_surface.h>

Syntax

bool SDL_PremultiplySurfaceAlpha(SDL_Surface *surface, bool linear);

Function Parameters

SDL_Surface *	surface	the surface to modify.
bool	linear	true to convert from sRGB to linear space for the alpha multiplication, false to do multiplication in sRGB space.

Return Value

(bool) Returns true on success or false on failure; call SDL_GetError() for more information.

Remarks

This is safe to use with src == dst, but not for other overlapping areas.

Version

This function is available since SDL 3.1.3.

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CategoryAPI, CategoryAPIFunction, CategorySurface

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