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,
     ...
)