OpenTK.Graphics.Rectangle.Union C# (CSharp) Method

        public static Rectangle Union(Rectangle a, Rectangle b)
        {
            return FromLTRB(Math.Min(a.Left, b.Left),
                     Math.Min(a.Top, b.Top),
                     Math.Max(a.Right, b.Right),
                     Math.Max(a.Bottom, b.Bottom));
        }