FairyGUI.GObject.RootToLocal C# (CSharp) Method

        public Vector2 RootToLocal(Vector2 pt, GRoot r)
        {
            if (r == null || r == GRoot.inst)
            {
                //fast
                pt.x *= GRoot.contentScaleFactor;
                pt.y *= GRoot.contentScaleFactor;
            }
            else
                pt = r.LocalToGlobal(pt);
            return GlobalToLocal(pt);
        }