private void UpdateLayeredWindowBitmap()
{
if (surfaceBuffer.IsDisposed || this.terminated) { return; }
using (var gScreen = Graphics.FromHwnd(IntPtr.Zero))
{
var hScreenDC = gScreen.GetHdc();
var hOldBitmap = NativeMethods.SelectObject(surfaceBuffer.DeviceContext, surfaceBuffer.Handle);
var blend = new NativeMethods.BlendFunction
{
BlendOp = NativeMethods.AC_SRC_OVER,
BlendFlags = 0,
SourceConstantAlpha = 255,
AlphaFormat = NativeMethods.AC_SRC_ALPHA
};
var windowPosition = new NativeMethods.Point
{
X = this.Left,
Y = this.Top
};
var surfaceSize = new NativeMethods.Size
{
Width = surfaceBuffer.Width,
Height = surfaceBuffer.Height
};
var surfacePosition = new NativeMethods.Point
{
X = 0,
Y = 0
};
IntPtr handle = IntPtr.Zero;
try
{
if (!this.terminated)
{
if (this.InvokeRequired)
{
this.Invoke(new Action(() =>
{
handle = this.Handle;
}));
}
else
{
handle = this.Handle;
}
NativeMethods.UpdateLayeredWindow(
handle,
hScreenDC,
ref windowPosition,
ref surfaceSize,
surfaceBuffer.DeviceContext, //hBitmap,
ref surfacePosition,
0,
ref blend,
NativeMethods.ULW_ALPHA);
}
}
catch (ObjectDisposedException)
{
return;
}
NativeMethods.SelectObject(surfaceBuffer.DeviceContext, hOldBitmap);
gScreen.ReleaseHdc(hScreenDC);
}
}