a #GtkStyleContext
the #GtkIconSource specifying the icon to render
the size (#GtkIconSize) to render the icon at. A size of (GtkIconSize) -1 means render at the size of the source and don’t scale.
Return: a newly-created #GdkPixbuf containing the rendered icon
Deprecated: Use gtk_icon_theme_load_icon() instead.
3.0
Renders the icon specified by @source at the given @size, returning the result in a pixbuf.