code: func (v *OffscreenWindow) GetPixbuf() (*gdk.Pixbuf, error) {
  	c := C.gtk_offscreen_window_get_pixbuf(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	// Pixbuf is returned with ref count of 1, so don't increment.
  	// Is it a floating reference?
  	pb := &gdk.Pixbuf{glib.Take(unsafe.Pointer(c))}
  	return pb, nil
  }
docs: // GetPixbuf is a wrapper around gtk_offscreen_window_get_pixbuf().