pub unsafe extern "C" fn cairo_device_get_user_data(
device: *mut cairo_device_t,
key: *const cairo_user_data_key_t,
) -> *mut c_void
pub unsafe extern "C" fn cairo_device_get_user_data(
device: *mut cairo_device_t,
key: *const cairo_user_data_key_t,
) -> *mut c_void