internal static extern bool AlphaBlend(IntPtr hdcDest, int xoriginDest, int yoriginDest, int wDest, int hDest,
                                        IntPtr hdcSrc, int xoriginSrc, int yoriginSrc, int wSrc, int hSrc, BlendFunction pfn);
 internal static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDest, ref POINT pptDest,
                                                 ref Win32Size psize,
                                                 IntPtr hdcSrc, ref POINT pptSrc, uint crKey,
                                                 [In] ref BlendFunction pblend, uint dwFlags);