itkExtractImageFilterRegionCopier.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkExtractImageFilterRegionCopier.h,v $
  Language:  C++
  Date:      $Date: 2003/02/26 23:20:31 $
  Version:   $Revision: 1.3 $

  Copyright (c) 2002 Insight 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 D1, unsigned int D2>
  void ExtractImageFilterCopyRegion(const typename
                  BinaryUnsignedIntDispatch<D1, D2>::FirstEqualsSecondType &firstEqualsSecond,
                  ImageRegion<D1> &destRegion,
                  const ImageRegion<D2> &srcRegion,
                  const ImageRegion<D1> &)
  {
    ImageToImageFilterDefaultCopyRegion<D1, D2>(firstEqualsSecond, destRegion, srcRegion);
  }

  

  template <unsigned int D1, unsigned int D2>
  void ExtractImageFilterCopyRegion(const typename
                  BinaryUnsignedIntDispatch<D1, D2>::FirstLessThanSecondType &firstLessThanSecond,
                  ImageRegion<D1> &destRegion,
                  const ImageRegion<D2> &srcRegion,
                  const ImageRegion<D1> &totalInputExtractionRegion)
  {
    ImageToImageFilterDefaultCopyRegion<D1, D2>(firstLessThanSecond, destRegion, srcRegion);

  }


  template <unsigned int D1, unsigned int D2>
  void ExtractImageFilterCopyRegion(const typename
               BinaryUnsignedIntDispatch<D1, D2>::FirstGreaterThanSecondType &,
               ImageRegion<D1> &destRegion,
               const ImageRegion<D2> &srcRegion,
               const ImageRegion<D1> &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<D1> destIndex;
    Size<D1>  destSize;
    const Index<D2> &srcIndex = srcRegion.GetIndex();
    const Size<D2> &srcSize = srcRegion.GetSize();
    int count = 0;
    for (dim=0; dim < D1; ++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 D1, unsigned int D2>
  class ITK_EXPORT ExtractImageFilterRegionCopier
    : public ImageRegionCopier<D1, D2>
  {
  public:
    virtual void operator()(ImageRegion<D1> &destRegion,
                            const ImageRegion<D2> &srcRegion,
                            const ImageRegion<D1> &totalInputExtractionRegion) const
    {
      ExtractImageFilterCopyRegion<D1, D2>(BinaryUnsignedIntDispatch<D1, D2>::ComparisonType(),
                                          destRegion, srcRegion, totalInputExtractionRegion);
    }

    virtual void operator() (ImageRegion<D1> &destRegion,
                            const ImageRegion<D2> &srcRegion) const
    {
      ImageRegionCopier<D1,D2>::operator()(destRegion, srcRegion);
    }
  };



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

#endif

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