SDL_PremultiplySurfaceAlpha - Man Page

#include <SDL3/SDL_surface.h>

bool SDL_PremultiplySurfaceAlpha(SDL_Surface *surface, bool linear);

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

surface

the surface to modify.

linear

true to convert from sRGB to linear space for the alpha multiplication, false to do multiplication in sRGB space.

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

This function can be called on different threads with different surfaces.

This function is available since SDL 3.2.0.