SDL_SetSurfaceAlphaMod - Man Page

Set an additional alpha value used in blit operations.

Synopsis

#include <SDL3/SDL_surface.h>

bool SDL_SetSurfaceAlphaMod(SDL_Surface *surface, Uint8 alpha);

Description

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

for more information.

Thread Safety

This function is not thread safe.

Availability

This function is available since SDL 3.2.0.

See Also

SDL_GetSurfaceAlphaMod(3), SDL_SetSurfaceColorMod(3)

Referenced By

SDL_GetSurfaceAlphaMod(3), SDL_SetSurfaceColorMod(3).

SDL 3.2.16 Simple Directmedia Layer SDL3 FUNCTIONS