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.

for more information.

This function is not thread safe.

This function is available since SDL 3.2.0.