public void StartRender(IntPtr hWnd, int x, int y, int width, int height)
{
_srcWindowHandle = hWnd;
_clientX = x;
_clientY = y;
_clientWidth = width;
_clientHeight = height;
// 1st, change DirectX rendering size and register composition event.
_dxImage.Dispatcher.Invoke(() =>
{
_dxImage.SetPixelSize(_windowWidth, _windowHeight);
CompositionTarget.Rendering += CompositionTargetOnRendering;
});
// 2nd, find WorkerW and send 0x052C (undocumented) message to progman
var workerW = FindWorkerW();
if (workerW == IntPtr.Zero)
{
Debug.WriteLine("WARNING: Unknown desktop structure"); // SHELLDLL_DefView だとか WorkerW なくても動くが、ログだけ残しとく
}
var progman = NativeMethods.FindWindow("Progman", null);
// 3rd, stick myself to progman
NativeMethods.SetParent(_hWnd, workerW != IntPtr.Zero ? workerW : progman);
// 4th, move self to rendering position
NativeMethods.MoveWindow(_hWnd, _windowX, _windowY, _windowWidth, _windowHeight, true);
}
private void Img_SizeChanged(object sender, SizeChangedEventArgs e)
{
double dpiScale = 1.0; // default value for 96 dpi
// determine DPI
// (as of .NET 4.6.1, this returns the DPI of the primary monitor, if you have several different DPIs)
if (PresentationSource.FromVisual(this).CompositionTarget is HwndTarget hwndTarget)
{
dpiScale = hwndTarget.TransformToDevice.M11;
}
int surfWidth = (int)(host.ActualWidth < 0 ? 0 : Math.Ceiling(host.ActualWidth * dpiScale));
int surfHeight = (int)(host.ActualHeight < 0 ? 0 : Math.Ceiling(host.ActualHeight * dpiScale));
// Notify the D3D11Image of the pixel size desired for the DirectX rendering.
// The D3DRendering component will determine the size of the new surface it is given, at that point.
d3dImage.SetPixelSize(surfWidth, surfHeight);
}