Function gtk_sys::gtk_icon_set_render_icon_surface

pub unsafe extern "C" fn gtk_icon_set_render_icon_surface(
    icon_set: *mut GtkIconSet, 
    context: *mut GtkStyleContext, 
    size: c_int, 
    scale: c_int, 
    for_window: *mut GdkWindow
) -> *mut cairo_surface_t