the gtk.IconSource specifying the icon to render
the size (gtk.IconSize) to render the icon at. A size of (GtkIconSize) -1 means render at the size of the source and don’t scale.
a newly-created gdk.Pixbuf containing the rendered icon
Deprecated: Use IconTheme.loadIcon instead.
3.0
Renders the icon specified by source at the given size, returning the result in a pixbuf.