public void PushClipRect(Rect rcClip)
{
ClipRectangle = new Rectangle(Math.Min(rcClip.left, ClipRectangle.Left), Math.Min(rcClip.top, ClipRectangle.Top), Math.Min(rcClip.right, ClipRectangle.Right), Math.Min(rcClip.bottom, ClipRectangle.Bottom));
}