0030939: Draw Harness, ViewerTest - AIS_ViewCube animation does not work on Linux...

[occt.git] / src / ViewerTest / ViewerTest_ContinuousRedrawer.cxx

diff --git a/src/ViewerTest/ViewerTest_ContinuousRedrawer.cxx b/src/ViewerTest/ViewerTest_ContinuousRedrawer.cxx
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+++ b/src/ViewerTest/ViewerTest_ContinuousRedrawer.cxx
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+// Copyright (c) 2019-2020 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#include <ViewerTest_ContinuousRedrawer.hxx>
+
+#include <Aspect_DisplayConnection.hxx>
+#include <Aspect_Window.hxx>
+#include <OSD.hxx>
+#include <OSD_Timer.hxx>
+
+// =======================================================================
+// function : Instance
+// purpose  :
+// =======================================================================
+ViewerTest_ContinuousRedrawer& ViewerTest_ContinuousRedrawer::Instance()
+{
+  static ViewerTest_ContinuousRedrawer aRedrawer;
+  return aRedrawer;
+}
+
+// =======================================================================
+// function : ViewerTest_ContinuousRedrawer
+// purpose  :
+// =======================================================================
+ViewerTest_ContinuousRedrawer::ViewerTest_ContinuousRedrawer()
+: myThread (doThreadWrapper),
+  myWakeEvent (false),
+  myTargetFps (0.0),
+  myToStop (false),
+  myToPause (false)
+{
+  //
+}
+
+// =======================================================================
+// function : ~ViewerTest_ContinuousRedrawer
+// purpose  :
+// =======================================================================
+ViewerTest_ContinuousRedrawer::~ViewerTest_ContinuousRedrawer()
+{
+  Stop();
+}
+
+// =======================================================================
+// function : Start
+// purpose  :
+// =======================================================================
+void ViewerTest_ContinuousRedrawer::Start (const Handle(Aspect_Window)& theWindow,
+                                           Standard_Real theTargetFps)
+{
+  if (myWindow != theWindow
+   || myTargetFps != theTargetFps)
+  {
+    Stop();
+    myWindow = theWindow;
+    myTargetFps = theTargetFps;
+  }
+
+  if (myThread.GetId() == 0)
+  {
+    myToStop = false;
+    myToPause = false;
+    myThread.Run (this);
+  }
+  else
+  {
+    {
+      Standard_Mutex::Sentry aLock (myMutex);
+      myToStop = false;
+      myToPause = false;
+    }
+    myWakeEvent.Set();
+  }
+}
+
+// =======================================================================
+// function : Start
+// purpose  :
+// =======================================================================
+void ViewerTest_ContinuousRedrawer::Stop (const Handle(Aspect_Window)& theWindow)
+{
+  if (!theWindow.IsNull()
+    && myWindow != theWindow)
+  {
+    return;
+  }
+
+  {
+    Standard_Mutex::Sentry aLock (myMutex);
+    myToStop = true;
+    myToPause = false;
+  }
+  myWakeEvent.Set();
+  myThread.Wait();
+  myToStop = false;
+  myWindow.Nullify();
+}
+
+// =======================================================================
+// function : doThreadLoop
+// purpose  :
+// =======================================================================
+void ViewerTest_ContinuousRedrawer::Pause()
+{
+  if (!myToPause)
+  {
+    Standard_Mutex::Sentry aLock (myMutex);
+    myToPause = true;
+  }
+}
+
+// =======================================================================
+// function : doThreadLoop
+// purpose  :
+// =======================================================================
+void ViewerTest_ContinuousRedrawer::doThreadLoop()
+{
+  Handle(Aspect_DisplayConnection) aDisp = new Aspect_DisplayConnection();
+  OSD_Timer aTimer;
+  aTimer.Start();
+  Standard_Real aTimeOld = 0.0;
+  const Standard_Real aTargetDur = myTargetFps > 0.0 ? 1.0 / myTargetFps : -1.0;
+  for (;;)
+  {
+    bool toPause = false;
+    {
+      Standard_Mutex::Sentry aLock (myMutex);
+      if (myToStop)
+      {
+        return;
+      }
+      toPause = myToPause;
+    }
+    if (toPause)
+    {
+      myWakeEvent.Wait();
+      myWakeEvent.Reset();
+    }
+
+    if (myTargetFps > 0.0)
+    {
+      const Standard_Real aTimeNew  = aTimer.ElapsedTime();
+      const Standard_Real aDuration = aTimeNew - aTimeOld;
+      if (aDuration >= aTargetDur)
+      {
+        myWindow->InvalidateContent (aDisp);
+        aTimeOld = aTimeNew;
+      }
+    }
+    else
+    {
+      myWindow->InvalidateContent (aDisp);
+    }
+
+    OSD::MilliSecSleep (1);
+  }
+}