static unsafe extern bool gdk_pixbuf_save_to_callbackv(IntPtr raw, GdkSharp.PixbufSaveFuncNative save_func, IntPtr user_data, IntPtr type, IntPtr[] option_keys, IntPtr[] option_values, out IntPtr error);
static extern void gdk_window_invalidate_maybe_recurse(IntPtr raw, IntPtr region, GdkSharp.WindowChildFuncNative child_func, IntPtr user_data);
static extern void gdk_window_remove_filter (IntPtr handle, GdkSharp.FilterFuncNative wrapper, IntPtr data);
static extern void gdk_display_add_client_message_filter(IntPtr raw, IntPtr message_type, GdkSharp.FilterFuncNative func, IntPtr data);