AdvancedLauncher.Tools.Interop.RedirectedWindow.UpdateRedirectedBitmap C# (CSharp) Method

        public BitmapSource UpdateRedirectedBitmap()
        {
            RECT rcClient = new RECT();
            NativeMethods.GetClientRect(Handle, ref rcClient);
            if (_interopBitmap == null || rcClient.width != _bitmapWidth || rcClient.height != _bitmapHeight) {
                if (_interopBitmap != null) {
                    DestroyBitmap();
                }

                CreateBitmap(rcClient.width, rcClient.height);
            }

            // PrintWindow doesn't seem to work any better than BitBlt.
            // TODO: make it an option
            // User32.NativeMethods.PrintWindow(Handle, _hDC, PW.DEFAULT);

            IntPtr hdcSrc = NativeMethods.GetDC(Handle);
            NativeMethods.BitBlt(_hDC, 0, 0, _bitmapWidth, _bitmapHeight, hdcSrc, 0, 0, ROP.SRCCOPY);
            NativeMethods.ReleaseDC(Handle, hdcSrc);

            if (_interopBitmap != null) {
                _interopBitmap.Invalidate();
            }

            return _interopBitmap;
        }