pub unsafe extern "C" fn cairo_device_observer_print(
device: *mut cairo_device_t,
write_func: cairo_write_func_t,
closure: *mut c_void,
) -> cairo_status_t
pub unsafe extern "C" fn cairo_device_observer_print(
device: *mut cairo_device_t,
write_func: cairo_write_func_t,
closure: *mut c_void,
) -> cairo_status_t