Function gdk_sys::gdk_window_get_device_position_double

pub unsafe extern "C" fn gdk_window_get_device_position_double(
    window: *mut GdkWindow, 
    device: *mut GdkDevice, 
    x: *mut c_double, 
    y: *mut c_double, 
    mask: *mut GdkModifierType
) -> *mut GdkWindow