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Imaging/vtkImageIterateFilter.h

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

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

Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkImageIterateFilter_h
#define __vtkImageIterateFilter_h


#include "vtkImageToImageFilter.h"

class VTK_IMAGING_EXPORT vtkImageIterateFilter : public vtkImageToImageFilter
{
public:
  vtkTypeMacro(vtkImageIterateFilter,vtkImageToImageFilter);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkGetMacro(Iteration,int);
  vtkGetMacro(NumberOfIterations,int);  

  void ComputeInputUpdateExtents( vtkDataObject *output );
  //BTX
  void ComputeInputUpdateExtent( int [6], int [6] )
    { vtkErrorMacro( << "ComputeInputUpdateExtent should be implemented in subclass" );};
  //ETX

protected:
  vtkImageIterateFilter();
  ~vtkImageIterateFilter();

  // Superclass API. Sets defaults, then calls 
  // ExecuteInformation(vtkImageData *inData, vtkImageData *outData)
  // for each iteration
  void ExecuteInformation();
  // Called for each iteration (differs from superclass in arguments).
  // You should override this method if needed.
  virtual void ExecuteInformation(vtkImageData *inData, vtkImageData *outData);
  
  // Superclass API: Calls Execute(vtkImageData *inData, vtkImageData *outData)
  // for each iteration.
  void ExecuteData(vtkDataObject *output);
  virtual void IterativeExecuteData(vtkImageData *in, vtkImageData *out) = 0;
  
  // Replaces "EnlargeOutputUpdateExtent"
  virtual void AllocateOutputScalars(vtkImageData *outData);
  
  // Allows subclass to specify the number of iterations  
  virtual void SetNumberOfIterations(int num);
  
  // for filters that execute multiple times.
  int NumberOfIterations;
  int Iteration;
  // A list of intermediate caches that is created when 
  // is called SetNumberOfIterations()
  vtkImageData **IterationData;
  
  // returns correct vtkImageDatas based on current iteration.
  vtkImageData *GetIterationInput();
  vtkImageData *GetIterationOutput();
private:
  vtkImageIterateFilter(const vtkImageIterateFilter&);  // Not implemented.
  void operator=(const vtkImageIterateFilter&);  // Not implemented.
};

#endif

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