start implementation of multicam panel

app/widget/manageddisplay/manageddisplay.cpp

@@ -275,6 +275,14 @@ void ManagedDisplayWidget::SetInnerMouseTracking(bool e)
   }
 }
 
+VideoParams ManagedDisplayWidget::GetViewportParams() const
+{
+  int device_width = width() * devicePixelRatioF();
+  int device_height = height() * devicePixelRatioF();
+  VideoParams::Format device_format = static_cast<VideoParams::Format>(OLIVE_CONFIG("OfflinePixelFormat").toInt());
+  return VideoParams(device_width, device_height, device_format, VideoParams::kInternalChannelCount);
+}
+
 void ManagedDisplayWidget::update()
 {
   if (RenderManager::instance()->backend() == RenderManager::kOpenGL) {

app/widget/manageddisplay/manageddisplay.h

@@ -58,7 +58,8 @@ protected:
   virtual void initializeGL() override
   {
     connect(context(), &QOpenGLContext::aboutToBeDestroyed,
-            this, &ManagedDisplayWidgetOpenGL::OnDestroy);
+            this, &ManagedDisplayWidgetOpenGL::DestroyListener,
+            Qt::DirectConnection);
 
     emit OnInit();
   }
@@ -211,6 +212,8 @@ protected:
     return wrapper_ ? wrapper_->rect() : QRect();
   }
 
+  VideoParams GetViewportParams() const;
+
 protected slots:
   /**
    * @brief Called whenever the internal rendering context has been created