public static extern bool UpdateLayeredWindow(
IntPtr hWnd,
IntPtr hdcDst,
[In] ref NativeMethods.Point pptDst,
[In] ref NativeMethods.Size pSize,
IntPtr hdcSrc,
[In] ref NativeMethods.Point pptSrc,
int crKey,
[In] ref NativeMethods.BlendFunction pBlend,
uint dwFlags);
private void UpdateLayeredWindowBitmap()
{
if (this.surfaceBuffer.IsDisposed || this.terminated)
{
return;
}
using (Graphics graphics = Graphics.FromHwnd(IntPtr.Zero))
{
IntPtr hdc = graphics.GetHdc();
IntPtr hgdiobj = NativeMethods.SelectObject(this.surfaceBuffer.DeviceContext, this.surfaceBuffer.Handle);
NativeMethods.BlendFunction pBlend = new NativeMethods.BlendFunction()
{
BlendOp = 0,
BlendFlags = 0,
SourceConstantAlpha = byte.MaxValue,
AlphaFormat = 1
};
NativeMethods.Point point = new NativeMethods.Point();
point.X = this.Left;
point.Y = this.Top;
NativeMethods.Point pptDst = point;
NativeMethods.Size pSize = new NativeMethods.Size()
{
Width = this.surfaceBuffer.Width,
Height = this.surfaceBuffer.Height
};
point = new NativeMethods.Point();
point.X = 0;
point.Y = 0;
NativeMethods.Point pptSrc = point;
IntPtr handle = IntPtr.Zero;
try
{
if (!this.terminated)
{
if (this.InvokeRequired)
{
this.Invoke((Action)(() => handle = this.Handle));
}
else
{
handle = this.Handle;
}
NativeMethods.UpdateLayeredWindow(handle, hdc, ref pptDst, ref pSize, this.surfaceBuffer.DeviceContext, ref pptSrc, 0, ref pBlend, 2U);
}
}
catch (ObjectDisposedException ex)
{
return;
}
NativeMethods.SelectObject(this.surfaceBuffer.DeviceContext, hgdiobj);
graphics.ReleaseHdc(hdc);
}
}
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);
}
}
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);
}
}
