[DllImport("gdi32")] public static extern int SetWorldTransform(HDC hdc, ref XFORM lpXform);
[DllImport("gdi32")] public static extern int ExtCreateRegion(ref XFORM lpXform, int nCount, ref RGNDATA lpRgnData);
[DllImport("gdi32")] public static extern int ModifyWorldTransform(HDC hdc, ref XFORM lpXform, int iMode);
[DllImport("gdi32")] public static extern int CombineTransform(ref XFORM lpxformResult, ref XFORM lpxform1, ref XFORM lpxform2);