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dwm.exe

Performance issue when resizing Win32 containing WPF

I am in the process of migrating an existing legacy project. For now we want to use C++/CLI as a bridge between business logic (native C++) and interface (WPF). I followed this MSDN article on how to host WPF content in a Win32 window as a starting point. However, I cannot wrap my head around this problem: Whenever I resize the host window...


There are serious delays and the window is repainting slowly.
It causes the Desktop Window Manager (dwm.exe) to increase dramatically in memory usage (2 GB in a few seconds of resizing)


I stripped down the code to its bare minimum. A simple, red WPF page and a normal Win32 project with little changes:

namespace ManagedCode {
using namespace System;
using namespace System::Windows::Interop;

void Create(HWND parent) {
HwndSource^ container = gcnew HwndSource(NULL, WS_CHILD | WS_VISIBLE, NULL,
0, 0, 100, 100, 'WPFCONTENT', IntPtr(parent));
Managed::WpfPage^ page = gcnew Managed::WpfPage();
container->RootVisual = page;
}
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
...
case WM_CREATE:
ManagedCode::Create(hWnd);
...
}


This has to be something really stupid.

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dwm.exe