Function sdl2_sys::SDL_GetSurfaceAlphaMod

source ยท 
pub unsafe extern "C" fn SDL_GetSurfaceAlphaMod(
    surface: *mut SDL_Surface,
    alpha: *mut Uint8,
) -> c_int
Expand description

Get the additional alpha value used in blit operations.

\param surface the SDL_Surface structure to query \param alpha a pointer filled in with the current alpha value \returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.

\since This function is available since SDL 2.0.0.

\sa SDL_GetSurfaceColorMod \sa SDL_SetSurfaceAlphaMod