(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)

SDL_PremultiplySurfaceAlpha

Premultiply the alpha in a surface.

Header File

Defined in <SDL3/SDL_surface.h>

Syntax

SDL_bool SDL_PremultiplySurfaceAlpha(SDL_Surface *surface, SDL_bool linear);

Function Parameters

SDL_Surface *	surface	the surface to modify.
SDL_bool	linear	SDL_TRUE to convert from sRGB to linear space for the alpha multiplication, SDL_FALSE to do multiplication in sRGB space.

Return Value

(SDL_bool) Returns SDL_TRUE on success or SDL_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 3.0.0.

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CategoryAPI, CategoryAPIFunction, CategorySurface

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