SDL_SetSurfaceAlphaMod(3)

Usage

#include "SDL3/SDL.h"

bool SDL_SetSurfaceAlphaMod(SDL_Surface *surface, Uint8 alpha);

Header file

Defined in SDL3/SDL_surface.h

Overview

When this surface is blitted, during the blit operation the source alpha value is modulated by this alpha value according to the following formula: srcA=srcA*(alpha/255)

Function parameters

`surface`	the `SDL_Surface` structure to update.
`alpha`	the alpha value multiplied into blit operations.

Return value

Returns true on success or false on failure; call

SDL_GetError () for more information.

Thread safety

This function is not thread safe.

Referred to by

SDL_GetSurfaceAlphaMod(3) Get the additional alpha value used in blit operations. SDL_SetSurfaceColorMod(3) Set an additional color value multiplied into blit operations.