code: func PixbufNew(colorspace Colorspace, hasAlpha bool, bitsPerSample, width, height int) (*Pixbuf, error) {
  	c := C.gdk_pixbuf_new(C.GdkColorspace(colorspace), gbool(hasAlpha),
  		C.int(bitsPerSample), C.int(width), C.int(height))
  	if c == nil {
  		return nil, nilPtrErr
  	}
  
  	obj := &glib.Object{glib.ToGObject(unsafe.Pointer(c))}
  	p := &Pixbuf{obj}
  	//obj.Ref()
  	runtime.SetFinalizer(p, func(_ interface{}) { obj.Unref() })
  	return p, nil
  }
docs: // PixbufNew is a wrapper around gdk_pixbuf_new().