QmitkVideoBackground.h

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/*============================================================================

The Medical Imaging Interaction Toolkit (MITK)

Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.

Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.

============================================================================*/

#ifndef _Qmitk_Video_Background_h_
#define _Qmitk_Video_Background_h_

// MITK
#include "MitkQtWidgetsExtExports.h"
#include "mitkVideoSource.h"

// Qt
#include <QObject>
class QTimer;

// vtk
class vtkRenderer;
class vtkRenderWindow;
class vtkImageActor;
class vtkImageImport;
class vtkActor2D;
class vtkVideoSizeCallback;
class vtkObject;

class MITKQTWIDGETSEXT_EXPORT QmitkVideoBackground : public QObject
{
  Q_OBJECT

public:
  explicit QmitkVideoBackground(QObject *parent = nullptr);
  explicit QmitkVideoBackground(mitk::VideoSource *v, int TimerDelay = 25);
  ~QmitkVideoBackground() override;

  void AddRenderWindow(vtkRenderWindow *renderWindow);
  void RemoveRenderWindow(vtkRenderWindow *renderWindow);
  bool IsRenderWindowIncluded(vtkRenderWindow *renderWindow);

  void SetTimerDelay(int ms);
  void Enable();
  void Disable();
  bool IsEnabled();

  mitk::VideoSource *GetVideoSource();
  int GetTimerDelay();
  void Pause();
  void Resume();

  void SetVideoSource(mitk::VideoSource *videoSource);

  static void OnRenderWindowDelete(vtkObject *, unsigned long eid, void *clientdata, void * /*calldata*/);

  void OnVideoSourceDelete(const itk::Object *caller, const itk::EventObject &event);
public slots:
  void UpdateVideo();
signals:
  void NewFrameAvailable(mitk::VideoSource *);

  void EndOfVideoSourceReached(mitk::VideoSource *);

protected:
  struct VideoBackgroundVectorInfo
  {
    vtkRenderWindow *renWin;
    vtkRenderer *videoRenderer;
    vtkImageActor *videoActor;
    vtkImageImport *videoImport;
    unsigned long renderWindowObserverTag;
  };

  void RemoveRenderWindow(vtkRenderWindow *renderWindow, bool removeObserver);
  void ResetVideoBackground();

  void Modified();
  typedef std::vector<VideoBackgroundVectorInfo> RenderWindowVectorInfoType;

protected:
  RenderWindowVectorInfoType m_renderWindowVectorInfo;

  QTimer *m_QTimer;

  mitk::VideoSource *m_VideoSource;

  unsigned long m_VideoSourceObserverTag;
};

#endif