protected static System.Drawing.Rectangle ToD3DRectangleExtent( PixelBox lockBox )
{
Debug.Assert( lockBox.Depth == 1 );
System.Drawing.Rectangle r = new System.Drawing.Rectangle();
r.X = 0;
r.Width = lockBox.Width;
r.X = 0;
r.Height = lockBox.Height;
return r;
}