Function xcb::ffi::xfixes::xcb_xfixes_union_region

pub unsafe extern "C" fn xcb_xfixes_union_region(
    c: *mut xcb_connection_t, 
    source1: xcb_xfixes_region_t, 
    source2: xcb_xfixes_region_t, 
    destination: xcb_xfixes_region_t
) -> xcb_void_cookie_t