protected void UpdateLayered()
{
IntPtr dC = Win32Interop.GetDC(IntPtr.Zero);
IntPtr hDC = Win32Interop.CreateCompatibleDC(dC);
IntPtr zero = IntPtr.Zero;
IntPtr hObject = IntPtr.Zero;
Render(Graphics.FromImage(feedbackImage));
try
{
zero = feedbackImage.GetHbitmap(Color.FromArgb(0));
hObject = Win32Interop.SelectObject(hDC, zero);
Win32Interop.SIZE psize = new Win32Interop.SIZE(Width, Height);
Win32Interop.POINT pprSrc = new Win32Interop.POINT(0, 0);
Win32Interop.POINT pptDst = new Win32Interop.POINT(Left, Top);
Win32Interop.BLENDFUNCTION pblend = new Win32Interop.BLENDFUNCTION();
pblend.BlendOp = 0;
pblend.BlendFlags = 0;
pblend.SourceConstantAlpha = 255;
pblend.AlphaFormat = 1;
Win32Interop.UpdateLayeredWindow(Handle, dC, ref pptDst, ref psize, hDC, ref pprSrc, 0, ref pblend, 2);
}
finally
{
Win32Interop.ReleaseDC(IntPtr.Zero, dC);
if (zero != IntPtr.Zero)
{
Win32Interop.SelectObject(hDC, hObject);
Win32Interop.DeleteObject(zero);
}
Win32Interop.DeleteDC(hDC);
}
}