Function GetOrCreate

DWMBlurGlassExt/Section/VisualManager.cpp:55–89

	}

	com_ptr<DCompPrivate::ICompositedBackdropVisual> GetOrCreate(DWM::CTopLevelWindow* window, bool createIfNecessary,
		bool silent)
	{
		auto it{ g_backdropMap.find(window) };

		if (createIfNecessary)
		{
			auto data{ window->GetData() };

			if (
				data &&
				it == g_backdropMap.end()
				)
			{
				HWND targetWindow{ data->GetHWND() };
				HWND shellWindow{ DWM::GetShellWindowForCurrentDesktop() };

				if (targetWindow != shellWindow)
				{
					auto result{ g_backdropMap.emplace(window, winrt::make<CCompositedBackdropVisual>(window)) };
					if (result.second == true)
					{
						it = result.first;
	
						if (!silent)
						{
							RedrawTopLevelWindow(window);
						}
					}
				}
			}
		}

		return it == g_backdropMap.end() ? nullptr : it->second;
	}

	com_ptr<DCompPrivate::ICompositedBackdropVisual> GetOrCreateForAccentBlurRect(DWM::CTopLevelWindow* window,
		LPCRECT accentBlurRect, bool createIfNecessary, bool silent)