---

Filtering/vtkImageMultipleInputFilter.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkImageMultipleInputFilter.h,v $
  Language:  C++

  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.

=========================================================================*/
#ifndef __vtkImageMultipleInputFilter_h
#define __vtkImageMultipleInputFilter_h

#include "vtkImageSource.h"

class vtkMultiThreader;

class VTK_FILTERING_EXPORT vtkImageMultipleInputFilter : public vtkImageSource
{
public:
  vtkTypeRevisionMacro(vtkImageMultipleInputFilter,vtkImageSource);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void SetInput(int num, vtkImageData *input);


  virtual void AddInput(vtkImageData *input);
  virtual void RemoveInput(vtkImageData *input);
  

  vtkImageData *GetInput(int num);
  vtkImageData *GetInput();


  vtkSetMacro(Bypass,int);
  vtkGetMacro(Bypass,int);
  vtkBooleanMacro(Bypass,int);


  vtkSetClampMacro( NumberOfThreads, int, 1, VTK_MAX_THREADS );
  vtkGetMacro( NumberOfThreads, int );


  virtual int SplitExtent(int splitExt[6], int startExt[6], 
                          int num, int total);


  virtual void ThreadedExecute(vtkImageData **inDatas, 
                               vtkImageData *outData,
                               int extent[6], int threadId);



protected:
  vtkImageMultipleInputFilter();
  ~vtkImageMultipleInputFilter();

  vtkMultiThreader *Threader;
  int Bypass;
  int NumberOfThreads;

  void ComputeInputUpdateExtents( vtkDataObject *output );
  
  virtual void ComputeInputUpdateExtent( int inExt[6], 
                                         int outExt[6], 
                                         int whichInput );


  void ExecuteData(vtkDataObject *output);

  // This one gets called by the superclass.
  void ExecuteInformation();
  // This is the one you should override.
  virtual void ExecuteInformation(vtkImageData **, vtkImageData *) {};

private:
  // hide the superclass' AddInput() from the user and the compiler
  void AddInput(vtkDataObject *)
    { vtkErrorMacro( << "AddInput() must be called with a vtkImageData not a vtkDataObject."); };
  void RemoveInput(vtkDataObject *)
    { vtkErrorMacro( << "RemoveInput() must be called with a vtkImageData not a vtkDataObject."); };
private:
  vtkImageMultipleInputFilter(const vtkImageMultipleInputFilter&);  // Not implemented.
  void operator=(const vtkImageMultipleInputFilter&);  // Not implemented.
};

#endif

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