the built-in image pixbuf, or %NULL. No extra reference is added to the returned pixbuf, so if you want to keep it around, you must use g_object_ref(). The returned image must not be modified.
Deprecated: This function is deprecated, use gtk_icon_theme_add_resource_path() instead of builtin icons.
2.4
Gets the built-in image for this icon, if any. To allow GTK+ to use built in icon images, you must pass the %GTK_ICON_LOOKUP_USE_BUILTIN to gtk_icon_theme_lookup_icon().