Provided by: libsdl3-doc_3.2.10+ds-1_all 

NAME
SDL_PremultiplySurfaceAlpha - Premultiply the alpha in a surface.
HEADER FILE
Defined in SDL3/SDL_surface.h
SYNOPSIS
#include "SDL3/SDL.h" bool SDL_PremultiplySurfaceAlpha(SDL_Surface *surface, bool linear);
DESCRIPTION
This is safe to use with src == dst, but not for other overlapping areas.
FUNCTION PARAMETERS
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.
RETURN VALUE
Returns true on success or false on failure; call SDL_GetError () for more information.
THREAD SAFETY
This function is not thread safe.
AVAILABILITY
This function is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.10 SDL_PremultiplySurfaceAlpha(3)