Man page - sdl_setsurfacealphamod(3)

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Manual

SDL_SetSurfaceAlphaMod

NAME
HEADER FILE
SYNOPSIS
DESCRIPTION
FUNCTION PARAMETERS
RETURN VALUE
THREAD SAFETY
AVAILABILITY
SEE ALSO

NAME

SDL_SetSurfaceAlphaMod - Set an additional alpha value used in blit operations.

HEADER FILE

Defined in SDL3/SDL_surface.h

SYNOPSIS

#include "SDL3/SDL.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

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.