Add wgc demo

demo/App.cpp

@@ -0,0 +1,85 @@
+//*********************************************************
+//
+// Copyright (c) Microsoft. All rights reserved.
+// This code is licensed under the MIT License (MIT).
+// THE SOFTWARE IS PROVIDED <20>AS IS? WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
+// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+//*********************************************************
+
+#include "pch.h"
+#include "App.h"
+#include "SimpleCapture.h"
+
+using namespace winrt;
+using namespace Windows::System;
+using namespace Windows::Foundation;
+using namespace Windows::UI;
+using namespace Windows::UI::Composition;
+using namespace Windows::Graphics::Capture;
+
+void App::Initialize(ContainerVisual const &root) {
+  auto queue = DispatcherQueue::GetForCurrentThread();
+
+  m_compositor = root.Compositor();
+  m_root = m_compositor.CreateContainerVisual();
+  m_content = m_compositor.CreateSpriteVisual();
+  m_brush = m_compositor.CreateSurfaceBrush();
+
+  m_root.RelativeSizeAdjustment({1, 1});
+  root.Children().InsertAtTop(m_root);
+
+  m_content.AnchorPoint({0.5f, 0.5f});
+  m_content.RelativeOffsetAdjustment({0.5f, 0.5f, 0});
+  m_content.RelativeSizeAdjustment({1, 1});
+  m_content.Size({-80, -80});
+  m_content.Brush(m_brush);
+  m_brush.HorizontalAlignmentRatio(0.5f);
+  m_brush.VerticalAlignmentRatio(0.5f);
+  m_brush.Stretch(CompositionStretch::Uniform);
+  auto shadow = m_compositor.CreateDropShadow();
+  shadow.Mask(m_brush);
+  m_content.Shadow(shadow);
+  m_root.Children().InsertAtTop(m_content);
+
+  auto d3dDevice = CreateD3DDevice();
+  auto dxgiDevice = d3dDevice.as<IDXGIDevice>();
+  m_device = CreateDirect3DDevice(dxgiDevice.get());
+}
+
+void App::StartCapture(HWND hwnd) {
+  if (m_capture) {
+    m_capture->Close();
+    m_capture = nullptr;
+  }
+
+  auto item = CreateCaptureItemForWindow(hwnd);
+
+  m_capture = std::make_unique<SimpleCapture>(m_device, item);
+
+  auto surface = m_capture->CreateSurface(m_compositor);
+  m_brush.Surface(surface);
+
+  m_capture->StartCapture();
+}
+
+void App::StartCapture(HMONITOR hmonitor) {
+  if (m_capture) {
+    m_capture->Close();
+    m_capture = nullptr;
+  }
+
+  auto item = CreateCaptureItemForMonitor(hmonitor);
+
+  m_capture = std::make_unique<SimpleCapture>(m_device, item);
+
+  auto surface = m_capture->CreateSurface(m_compositor);
+  m_brush.Surface(surface);
+
+  m_capture->StartCapture();
+}