0032523: Draw Harness, ViewerTest - vrepaint -continuous has no effect

ViewerTest_ContinuousRedrawer now explicitly invalidates V3d_View content
in addition to emitting window content redrawing request.

"vrepaint -continuous" now tries to avoid creation of dedicated thread
on Windows platform and relies on AIS_ViewController::SetContinuousRedraw().

src/AIS/AIS_ViewController.cxx

@@ -37,6 +37,7 @@
 AIS_ViewController::AIS_ViewController()
 : myLastEventsTime    (0.0),
   myToAskNextFrame    (false),
+  myIsContinuousRedraw(false),
   myMinCamDistance    (1.0),
   myRotationMode      (AIS_RotationMode_BndBoxActive),
   myNavigationMode    (AIS_NavigationMode_Orbit),
@@ -2943,6 +2944,10 @@ void AIS_ViewController::handleViewRedraw (const Handle(AIS_InteractiveContext)&
     setAskNextFrame();
   }
 
+  if (myIsContinuousRedraw)
+  {
+    myToAskNextFrame = true;
+  }
   if (theView->View()->IsActiveXR())
   {
     // VR requires continuous rendering

src/AIS/AIS_ViewController.hxx

@@ -77,6 +77,13 @@ public:
   //! Interrupt active view animation.
   Standard_EXPORT void AbortViewAnimation();
 
+  //! Return TRUE if continuous redrawing is enabled; FALSE by default.
+  //! This option would request a next viewer frame to be completely redrawn right after current frame is finished.
+  bool IsContinuousRedraw() const { return myIsContinuousRedraw; }
+
+  //! Enable or disable continuous updates.
+  void SetContinuousRedraw (bool theToEnable) { myIsContinuousRedraw = theToEnable; }
+
 public: //! @name global parameters
 
   //! Return camera rotation mode, AIS_RotationMode_BndBoxActive by default.
@@ -679,6 +686,7 @@ protected:
 
   Standard_Real       myLastEventsTime;           //!< last fetched events timer value for computing delta/progress
   Standard_Boolean    myToAskNextFrame;           //!< flag indicating that another frame should be drawn right after this one
+  Standard_Boolean    myIsContinuousRedraw;       //!< continuous redrawing (without immediate rendering optimization)
 
   Standard_Real       myMinCamDistance;           //!< minimal camera distance for zoom operation
   AIS_RotationMode    myRotationMode;             //!< rotation mode

src/ViewerTest/ViewerTest_ContinuousRedrawer.cxx

@@ -17,6 +17,7 @@
 #include <Aspect_Window.hxx>
 #include <OSD.hxx>
 #include <OSD_Timer.hxx>
+#include <V3d_View.hxx>
 
 // =======================================================================
 // function : Instance
@@ -55,14 +56,14 @@ ViewerTest_ContinuousRedrawer::~ViewerTest_ContinuousRedrawer()
 // function : Start
 // purpose  :
 // =======================================================================
-void ViewerTest_ContinuousRedrawer::Start (const Handle(Aspect_Window)& theWindow,
+void ViewerTest_ContinuousRedrawer::Start (const Handle(V3d_View)& theView,
                                            Standard_Real theTargetFps)
 {
-  if (myWindow != theWindow
+  if (myView != theView
    || myTargetFps != theTargetFps)
   {
     Stop();
-    myWindow = theWindow;
+    myView = theView;
     myTargetFps = theTargetFps;
   }
 
@@ -84,13 +85,13 @@ void ViewerTest_ContinuousRedrawer::Start (const Handle(Aspect_Window)& theWindo
 }
 
 // =======================================================================
-// function : Start
+// function : Stop
 // purpose  :
 // =======================================================================
-void ViewerTest_ContinuousRedrawer::Stop (const Handle(Aspect_Window)& theWindow)
+void ViewerTest_ContinuousRedrawer::Stop (const Handle(V3d_View)& theView)
 {
-  if (!theWindow.IsNull()
-    && myWindow != theWindow)
+  if (!theView.IsNull()
+    && myView != theView)
   {
     return;
   }
@@ -103,11 +104,11 @@ void ViewerTest_ContinuousRedrawer::Stop (const Handle(Aspect_Window)& theWindow
   myWakeEvent.Set();
   myThread.Wait();
   myToStop = false;
-  myWindow.Nullify();
+  myView.Nullify();
 }
 
 // =======================================================================
-// function : doThreadLoop
+// function : Pause
 // purpose  :
 // =======================================================================
 void ViewerTest_ContinuousRedrawer::Pause()
@@ -153,13 +154,15 @@ void ViewerTest_ContinuousRedrawer::doThreadLoop()
       const Standard_Real aDuration = aTimeNew - aTimeOld;
       if (aDuration >= aTargetDur)
       {
-        myWindow->InvalidateContent (aDisp);
+        myView->Invalidate();
+        myView->Window()->InvalidateContent (aDisp);
         aTimeOld = aTimeNew;
       }
     }
     else
     {
-      myWindow->InvalidateContent (aDisp);
+      myView->Invalidate();
+      myView->Window()->InvalidateContent (aDisp);
     }
 
     OSD::MilliSecSleep (1);

src/ViewerTest/ViewerTest_ContinuousRedrawer.hxx

@@ -20,6 +20,7 @@
 #include <Standard_Type.hxx>
 
 class Aspect_Window;
+class V3d_View;
 
 //! Auxiliary tool performing continuous redraws of specified window.
 //! Tool creates an extra working thread pushing content invalidation messages to specific window using Aspect_Window::InvalidateContent() method.
@@ -39,11 +40,11 @@ public:
   bool IsStarted() const { return myThread.GetId() != 0; }
 
   //! Start thread.
-  Standard_EXPORT void Start (const Handle(Aspect_Window)& theWindow,
+  Standard_EXPORT void Start (const Handle(V3d_View)& theView,
                               Standard_Real theTargetFps);
 
   //! Stop thread.
-  Standard_EXPORT void Stop (const Handle(Aspect_Window)& theWindow = NULL);
+  Standard_EXPORT void Stop (const Handle(V3d_View)& theView = NULL);
 
   //! Return TRUE if redrawer thread is in paused state.
   bool IsPaused() const { return myToPause; }
@@ -68,7 +69,7 @@ private:
   ViewerTest_ContinuousRedrawer();
 
 private:
-  Handle(Aspect_Window) myWindow; //!< window to invalidate
+  Handle(V3d_View)   myView;      //!< view to invalidate
   OSD_Thread         myThread;    //!< working thread
   Standard_Mutex     myMutex;     //!< mutex for accessing common variables
   Standard_Condition myWakeEvent; //!< event to wake up working thread

src/ViewerTest/ViewerTest_EventManager.cxx

@@ -197,7 +197,7 @@ void ViewerTest_EventManager::handleViewRedraw (const Handle(AIS_InteractiveCont
     {
       myIsTmpContRedraw = true;
     #if !defined(_WIN32) && !defined(__EMSCRIPTEN__)
-      aRedrawer.Start (theView->Window(), 60.0);
+      aRedrawer.Start (theView, 60.0);
     #endif
     }
 

src/ViewerTest/ViewerTest_ViewerCommands.cxx

@@ -2668,7 +2668,7 @@ void ViewerTest::RemoveView (const TCollection_AsciiString& theViewName, const S
   Handle(V3d_View) aView = ViewerTest_myViews.Find1(theViewName);
   Handle(AIS_InteractiveContext) aCurrentContext = FindContextByView(aView);
   ViewerTest_ContinuousRedrawer& aRedrawer = ViewerTest_ContinuousRedrawer::Instance();
-  aRedrawer.Stop (aView->Window());
+  aRedrawer.Stop (aView);
 
   // Remove view resources
   ViewerTest_myViews.UnBind1(theViewName);
@@ -2683,7 +2683,7 @@ void ViewerTest::RemoveView (const TCollection_AsciiString& theViewName, const S
   // unused empty contexts
   if (!aCurrentContext.IsNull())
   {
-    // Check if there are more difined views in the viewer
+    // Check if there are more defined views in the viewer
     if ((isContextRemoved || ViewerTest_myContexts.Size() != 1)
      && aCurrentContext->CurrentViewer()->DefinedViews().IsEmpty())
     {
@@ -3703,9 +3703,21 @@ static int VRepaint (Draw_Interpretor& , Standard_Integer theArgNb, const char**
       }
 
       ViewerTest_ContinuousRedrawer& aRedrawer = ViewerTest_ContinuousRedrawer::Instance();
-      if (Abs (aFps) >= 1.0)
+      ViewerTest::CurrentEventManager()->SetContinuousRedraw (false);
+      if (aFps >= 1.0)
       {
-        aRedrawer.Start (aView->Window(), aFps);
+        aRedrawer.Start (aView, aFps);
+      }
+      else if (aFps < 0.0)
+      {
+        if (ViewerTest::GetViewerFromContext()->ActiveViews().Extent() == 1)
+        {
+          aRedrawer.Stop();
+          ViewerTest::CurrentEventManager()->SetContinuousRedraw (true);
+          ViewerTest::CurrentEventManager()->FlushViewEvents (ViewerTest::GetAISContext(), ViewerTest::CurrentView(), true);
+          continue;
+        }
+        aRedrawer.Start (aView, aFps);
       }
       else
       {