the name of the icon to lookup
the desired icon size. The resulting icon may not be exactly this size; see gtk_icon_info_load_icon().
desired scale
#GdkWindow to optimize drawing for, or %NULL
flags modifying the behavior of the icon lookup
the rendered icon; this may be a newly created icon or a new reference to an internal icon, so you must not modify the icon. Use cairo_surface_destroy() to release your reference to the icon. %NULL if the icon isn’t found.
GException on failure.
3.10
Looks up an icon in an icon theme for a particular window scale, scales it to the given size and renders it into a cairo surface. This is a convenience function; if more details about the icon are needed, use gtk_icon_theme_lookup_icon() followed by gtk_icon_info_load_surface().
Note that you probably want to listen for icon theme changes and update the icon. This is usually done by connecting to the GtkWidget::style-set signal.