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81 lines
3.0 KiB
C++
81 lines
3.0 KiB
C++
// Copyright (c) 2019-2020 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _ViewerTest_ContinuousRedrawer_HeaderFile
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#define _ViewerTest_ContinuousRedrawer_HeaderFile
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#include <OSD_Thread.hxx>
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#include <Standard_Condition.hxx>
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#include <Standard_Mutex.hxx>
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#include <Standard_Type.hxx>
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class V3d_View;
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//! Auxiliary tool performing continuous redraws of specified window.
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//! Tool creates an extra working thread pushing content invalidation messages to specific window using Aspect_Window::InvalidateContent() method.
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//! Normally, GUI application should done continuous rendering in simple fashion - just by drawing next frame without waiting for new events from windowing system;
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//! however, implementation of this approach is problematic in context of ViewerTest due to message loop binding mechanism implied by Tcl/Tk.
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class ViewerTest_ContinuousRedrawer
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{
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public:
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//! Return global instance.
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Standard_EXPORT static ViewerTest_ContinuousRedrawer& Instance();
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public:
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//! Destructor.
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Standard_EXPORT ~ViewerTest_ContinuousRedrawer();
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//! Return TRUE if redrawer thread is started.
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bool IsStarted() const { return myThread.GetId() != 0; }
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//! Start thread.
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Standard_EXPORT void Start (const Handle(V3d_View)& theView,
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Standard_Real theTargetFps);
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//! Stop thread.
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Standard_EXPORT void Stop (const Handle(V3d_View)& theView = NULL);
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//! Return TRUE if redrawer thread is in paused state.
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bool IsPaused() const { return myToPause; }
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//! Pause working thread, but does not terminate it.
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Standard_EXPORT void Pause();
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private:
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//! Thread loop.
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void doThreadLoop();
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//! Thread creation callback.
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static Standard_Address doThreadWrapper (Standard_Address theData)
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{
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ViewerTest_ContinuousRedrawer* aThis = (ViewerTest_ContinuousRedrawer* )theData;
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aThis->doThreadLoop();
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return 0;
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}
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//! Empty constructor.
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ViewerTest_ContinuousRedrawer();
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private:
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Handle(V3d_View) myView; //!< view to invalidate
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OSD_Thread myThread; //!< working thread
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Standard_Mutex myMutex; //!< mutex for accessing common variables
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Standard_Condition myWakeEvent; //!< event to wake up working thread
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Standard_Real myTargetFps; //!< desired update framerate
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volatile bool myToStop; //!< flag to stop working thread
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volatile bool myToPause; //!< flag to put working thread asleep without stopping
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};
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#endif // _ViewerTest_ContinuousRedrawer_HeaderFile
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