add clipping function and the example.

Plugins/uDesktopDuplication/uDesktopDuplication/Cursor.cpp

@@ -38,7 +38,8 @@ void Cursor::UpdateBuffer(const DXGI_OUTDUPL_FRAME_INFO& frameInfo)
     isVisible_ = frameInfo.PointerPosition.Visible != 0;
     timestamp_ = frameInfo.LastMouseUpdateTime;
 
-    if (frameInfo.PointerPosition.Visible != 0) {
+    if (isVisible_) 
+    {
         GetMonitorManager()->SetCursorMonitorId(monitor_->GetId());
     }
 

Plugins/uDesktopDuplication/uDesktopDuplication/Monitor.cpp

@@ -72,8 +72,6 @@ HRESULT Monitor::Render(UINT timeout)
         return S_OK;
     }
 
-    if (unityTexture_ == nullptr) return 0;
-
     IDXGIResource* resource = nullptr;
     DXGI_OUTDUPL_FRAME_INFO frameInfo;
 
@@ -97,18 +95,22 @@ HRESULT Monitor::Render(UINT timeout)
         return hr;
     }
 
-    ID3D11Texture2D* texture;
-    resource->QueryInterface(__uuidof(ID3D11Texture2D), reinterpret_cast<void**>(&texture));
+    if (unityTexture_)
+    {
+        ID3D11Texture2D* texture;
+        resource->QueryInterface(__uuidof(ID3D11Texture2D), reinterpret_cast<void**>(&texture));
 
-    ID3D11DeviceContext* context;
-    GetDevice()->GetImmediateContext(&context);
-    context->CopyResource(unityTexture_, texture);
-    context->Release();
+        ID3D11DeviceContext* context;
+        GetDevice()->GetImmediateContext(&context);
+        context->CopyResource(unityTexture_, texture);
+        context->Release();
+
+        resource->Release();
+    }
 
     cursor_->UpdateBuffer(frameInfo);
     cursor_->UpdateTexture();
 
-    resource->Release();
     deskDupl_->ReleaseFrame();
 
     return S_OK;

Plugins/uDesktopDuplication/uDesktopDuplication/main.cpp

@@ -118,6 +118,12 @@ extern "C"
         return g_manager->GetMonitorCount();
     }
 
+    UNITY_INTERFACE_EXPORT int UNITY_INTERFACE_API GetCursorMonitorId()
+    {
+        if (!g_manager) return -1;
+        return g_manager->GetCursorMonitorId();
+    }
+
     UNITY_INTERFACE_EXPORT int UNITY_INTERFACE_API GetTotalWidth()
     {
         if (!g_manager) return 0;