itkExtractImageFilterRegionCopier.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkExtractImageFilterRegionCopier.h,v $
  Language:  C++
  Date:      $Date: 2008-10-15 12:45:53 $
  Version:   $Revision: 1.8 $

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

  Portions of this code are covered under the VTK copyright.
  See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 __itkExtractImageFilterRegionCopier_h
#define __itkExtractImageFilterRegionCopier_h

#include "itkImageToImageFilterDetail.h"

namespace itk
{

namespace ImageToImageFilterDetail
{
 
template <unsigned int T1, unsigned int T2>
void ExtractImageFilterCopyRegion(const typename
                                  BinaryUnsignedIntDispatch<T1, T2>::FirstEqualsSecondType &firstEqualsSecond,
                                  ImageRegion<T1> &destRegion,
                                  const ImageRegion<T2> &srcRegion,
                                  const ImageRegion<T1> &)
{
  ImageToImageFilterDefaultCopyRegion<T1, T2>(firstEqualsSecond, destRegion, srcRegion);
}

  

template <unsigned int T1, unsigned int T2>
void ExtractImageFilterCopyRegion(const typename
                                  BinaryUnsignedIntDispatch<T1, T2>::FirstLessThanSecondType &firstLessThanSecond,
                                  ImageRegion<T1> &destRegion,
                                  const ImageRegion<T2> &srcRegion,
                                  const ImageRegion<T1> &totalInputExtractionRegion)
{
  ImageToImageFilterDefaultCopyRegion<T1, T2>(firstLessThanSecond, destRegion, srcRegion);

}


template <unsigned int T1, unsigned int T2>
void ExtractImageFilterCopyRegion(const typename
                                  BinaryUnsignedIntDispatch<T1, T2>::FirstGreaterThanSecondType &,
                                  ImageRegion<T1> &destRegion,
                                  const ImageRegion<T2> &srcRegion,
                                  const ImageRegion<T1> &totalInputExtractionRegion)
{
  // Source dimension is less than the destination dimension, so look
  // at the m_TotalExtractionRegion and see what values in size are 0.
  // With these values, lock the destRegion.Index to the corresponding index
  unsigned int dim;
  Index<T1> destIndex;
  Size<T1>  destSize;
  const Index<T2> &srcIndex = srcRegion.GetIndex();
  const Size<T2> &srcSize = srcRegion.GetSize();
  int count = 0;
  for (dim=0; dim < T1; ++dim)
    {
    //for dimensions to be removed
    if (!totalInputExtractionRegion.GetSize()[dim])
      {
      destIndex[dim] = totalInputExtractionRegion.GetIndex()[dim];
      destSize[dim] = 1;
      }
    //for all other dimension
    else
      {
      destIndex[dim] = srcIndex[count];
      destSize[dim] = srcSize[count];
      count++;
      }
    }
  destRegion.SetIndex(destIndex);
  destRegion.SetSize(destSize);
}

template <unsigned int T1, unsigned int T2>
class ITK_EXPORT ExtractImageFilterRegionCopier
  : public ImageRegionCopier<T1, T2>
{
public:
  virtual void operator()(ImageRegion<T1> &destRegion,
                          const ImageRegion<T2> &srcRegion,
                          const ImageRegion<T1> &totalInputExtractionRegion) const
  {
    typedef typename BinaryUnsignedIntDispatch<T1, T2>::ComparisonType ComparisonType;
    ExtractImageFilterCopyRegion<T1, T2>(ComparisonType(),
                                         destRegion, srcRegion, totalInputExtractionRegion);
  }

  virtual void operator() (ImageRegion<T1> &destRegion,
                           const ImageRegion<T2> &srcRegion) const
    {
    ImageRegionCopier<T1,T2>::operator()(destRegion, srcRegion);
    }
};

} //end namespace ImageToImageFilterDetail
} //end namespace itk

#endif

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