itkFiniteDifferenceSparseImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkFiniteDifferenceSparseImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-16 23:25:41 $
  Version:   $Revision: 1.7 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.

     =========================================================================*/
#ifndef __itkFiniteDifferenceSparseImageFilter_h
#define __itkFiniteDifferenceSparseImageFilter_h 

#include "itkFiniteDifferenceSparseImageFunction.h"
#include "itkFiniteDifferenceImageFilter.h"
#include "itkMultiThreader.h"
#include "itkSparseImage.h"

namespace itk {

template <class TInputImageType, class TSparseOutputImageType>
class FiniteDifferenceSparseImageFilter
  : public FiniteDifferenceImageFilter <TInputImageType,
                                        TSparseOutputImageType>
{
public:
  typedef FiniteDifferenceSparseImageFilter       Self;
  typedef FiniteDifferenceImageFilter<
    TInputImageType, TSparseOutputImageType>      Superclass;
  typedef SmartPointer<Self>                      Pointer;
  typedef SmartPointer<const Self>                ConstPointer;

  itkTypeMacro(FiniteDifferenceSparseImageFilter, FiniteDifferenceImageFilter);

  typedef typename Superclass::InputImageType                  InputImageType;
  typedef typename Superclass::OutputImageType                 SparseOutputImageType;
  typedef typename Superclass::PixelType                       PixelType; 
  typedef typename Superclass::TimeStepType                    TimeStepType;
  typedef typename Superclass::FiniteDifferenceFunctionType    FiniteDifferenceFunctionType;
  // the PixelType is from output image; therefore, it is a pointer

  itkStaticConstMacro(ImageDimension, unsigned int,Superclass::ImageDimension);

  typedef typename SparseOutputImageType::IndexType    IndexType;
  typedef typename SparseOutputImageType::SizeType     SizeType;
  typedef typename SparseOutputImageType::NodeType     OutputNodeType;
  typedef typename SparseOutputImageType::NodeListType NodeListType;

  typedef typename OutputNodeType::NodeDataType NodeDataType;

  typedef typename OutputNodeType::NodeValueType NodeValueType;

  typedef FiniteDifferenceSparseImageFunction <SparseOutputImageType>
  SparseFunctionType;

  void SetSparseFunction( SparseFunctionType *sf );

  itkSetMacro(PrecomputeFlag, bool);
  itkGetMacro(PrecomputeFlag, bool);

protected:
  FiniteDifferenceSparseImageFilter();
  ~FiniteDifferenceSparseImageFilter() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void Initialize();

  virtual void AllocateUpdateBuffer() {};

  virtual NodeDataType DataConstraint( const NodeDataType &data ) const 
  { return data; }

private:
  struct ThreadRegionType 
    {
    // this is the first element
    typename NodeListType::Iterator first;
    // this is one past the last element
    typename NodeListType::Iterator last;  
    };

protected:
  int GetSplitRegion( int i, int num, ThreadRegionType &splitRegion );

  virtual void ApplyUpdate( TimeStepType dt );

  static ITK_THREAD_RETURN_TYPE ApplyUpdateThreaderCallback( void *arg );
  virtual void ThreadedApplyUpdate(TimeStepType dt,
                                   const ThreadRegionType &regionToProcess,
                                   int threadId);

  virtual TimeStepType CalculateChange();

  static ITK_THREAD_RETURN_TYPE CalculateChangeThreaderCallback( void *arg );
  virtual TimeStepType ThreadedCalculateChange
  (const ThreadRegionType &regionToProcess, int threadId);

  virtual void PrecalculateChange();

  static ITK_THREAD_RETURN_TYPE PrecalculateChangeThreaderCallback( void *arg );
  virtual void ThreadedPrecalculateChange
  (const ThreadRegionType &regionToProcess, int threadId);

  struct FDThreadStruct
    {
    FiniteDifferenceSparseImageFilter *Filter;
    TimeStepType TimeStep;
    TimeStepType *TimeStepList;
    bool *ValidTimeStepList;
    };

private:
  bool m_PrecomputeFlag;

  SparseFunctionType *m_SparseFunction;

  typename NodeListType::RegionListType m_RegionList;

  FiniteDifferenceSparseImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkFiniteDifferenceSparseImageFilter.txx"
#endif

#endif

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