pub unsafe extern "C" fn gdk_pixbuf_new_from_stream_at_scale_async(
    stream: *mut GInputStream,
    width: c_int,
    height: c_int,
    preserve_aspect_ratio: gboolean,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer
)