Function fermium::surface::SDL_SetSurfaceAlphaMod

pub unsafe extern "C" fn SDL_SetSurfaceAlphaMod(
    surface: *mut SDL_Surface, 
    alpha: u8
) -> c_int

Get the additional alpha value used in blit operations.

• surface: The surface to query.
• alpha: A pointer filled in with the current alpha value.

Return: 0 on success, or -1 if the surface is not valid.