extern internal static bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Win32Point pptDst, ref Win32Size psize, IntPtr hdcSrc, ref Win32Point pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, int dwFlags);
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);
