Function gdk_pixbuf_sys::gdk_pixbuf_save_to_stream_async

pub unsafe extern "C" fn gdk_pixbuf_save_to_stream_async(
    pixbuf: *mut GdkPixbuf,
    stream: *mut GOutputStream,
    type_: *const c_char,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer
    ...
)