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

  Program:   Visualization Toolkit
  Module:    vtkFixedPointVolumeRayCastCompositeHelper.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 1993-2002 Ken Martin, Will Schroeder, Bill Lorensen 
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notice for more information.

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

// .NAME vtkFixedPointVolumeRayCastCompositeHelper - A helper that generates composite images for the volume ray cast mapper
// .SECTION Description
// This is one of the helper classes for the vtkFixedPointVolumeRayCastMapper. 
// It will generate composite images using an alpha blending operation. 
// This class should not be used directly, it is a helper class for
// the mapper and has no user-level API.
//
// .SECTION see also
// vtkFixedPointVolumeRayCastMapper

#ifndef __vtkFixedPointVolumeRayCastCompositeHelper_h
#define __vtkFixedPointVolumeRayCastCompositeHelper_h

#include "vtkFixedPointVolumeRayCastHelper.h"

class vtkFixedPointVolumeRayCastMapper;
class vtkVolume;

class VTK_VOLUMERENDERING_EXPORT vtkFixedPointVolumeRayCastCompositeHelper : public vtkFixedPointVolumeRayCastHelper
{
public:
  static vtkFixedPointVolumeRayCastCompositeHelper *New();
  vtkTypeMacro(vtkFixedPointVolumeRayCastCompositeHelper,vtkFixedPointVolumeRayCastHelper);
  void PrintSelf( ostream& os, vtkIndent indent );

  virtual void  GenerateImage( int threadID, 
                               int threadCount,
                               vtkVolume *vol,
                               vtkFixedPointVolumeRayCastMapper *mapper);

protected:
  vtkFixedPointVolumeRayCastCompositeHelper();
  ~vtkFixedPointVolumeRayCastCompositeHelper();

private:
  vtkFixedPointVolumeRayCastCompositeHelper(const vtkFixedPointVolumeRayCastCompositeHelper&);  // Not implemented.
  void operator=(const vtkFixedPointVolumeRayCastCompositeHelper&);  // Not implemented.
};

#endif