ZoomIt: Add DemoMirror to mirror a monitor, region, or window to a second display

src/modules/ZoomIt/ZoomIt/CaptureFrameWait.cpp

@@ -33,7 +33,8 @@ namespace util
 CaptureFrameWait::CaptureFrameWait(
     winrt::IDirect3DDevice const& device,
     winrt::GraphicsCaptureItem const& item,
-    winrt::SizeInt32 const& size)
+    winrt::SizeInt32 const& size,
+    bool borderRequired)
 {
     m_device = device;
     m_item = item;
@@ -49,6 +50,11 @@ CaptureFrameWait::CaptureFrameWait(
         size);
     m_session = m_framePool.CreateCaptureSession(m_item);
 
+    if( !borderRequired )
+    {
+        ShowCaptureBorder( false );
+    }
+
     m_framePool.FrameArrived({ this, &CaptureFrameWait::OnFrameArrived });
     m_session.StartCapture();
 }

src/modules/ZoomIt/ZoomIt/CaptureFrameWait.h

@@ -100,10 +100,14 @@ struct CaptureFrame
 class CaptureFrameWait
 {
 public:
+    // borderRequired false suppresses the system capture border before the
+    // session starts; the process must already hold borderless capture
+    // access for it to take effect.
     CaptureFrameWait(
         winrt::Direct3D11::IDirect3DDevice const& device,
         winrt::GraphicsCaptureItem const& item,
-        winrt::SizeInt32 const& size );
+        winrt::SizeInt32 const& size,
+        bool borderRequired = true );
     ~CaptureFrameWait();
 
     std::optional<CaptureFrame> TryGetNextFrame();
@@ -124,6 +128,11 @@ class CaptureFrameWait
             m_session.IsBorderRequired( show );
         }
     }
+    void RecreateFramePool( winrt::SizeInt32 const& size )
+    {
+        auto lock = m_lock.lock_exclusive();
+        m_framePool.Recreate( m_device, winrt::DirectXPixelFormat::B8G8R8A8UIntNormalized, 1, size );
+    }
 
 private:
     void OnFrameArrived(