itkImageToImageFilterDetail.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkImageToImageFilterDetail.h,v $
  Language:  C++
  Date:      $Date: 2009-02-05 19:04:57 $
  Version:   $Revision: 1.9 $

  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 __itkImageToImageFilterDetail_h
#define __itkImageToImageFilterDetail_h

#include "itkImageRegion.h"
#include "itkSmartPointer.h"

namespace itk
{

namespace ImageToImageFilterDetail
{

struct DispatchBase {};

template <bool>
struct BooleanDispatch {};

template <int>
struct IntDispatch : public DispatchBase {};

template <unsigned int>
struct UnsignedIntDispatch : public DispatchBase {};

template <bool B1, bool B2>
struct BinaryBooleanDispatch
{

  typedef BooleanDispatch<B1> FirstType;
  typedef BooleanDispatch<B2> SecondType;
};

template <int D1, int D2>
struct BinaryIntDispatch
{

  typedef IntDispatch<D1> FirstType;
  typedef IntDispatch<D2> SecondType;
};

template <unsigned int D1, unsigned int D2>
struct BinaryUnsignedIntDispatch : public DispatchBase
{

  typedef UnsignedIntDispatch<D1> FirstType;
  typedef UnsignedIntDispatch<D2> SecondType;

  typedef IntDispatch<(D1 > D2) - (D1 < D2)> ComparisonType;
  typedef IntDispatch<0>                     FirstEqualsSecondType;  
  typedef IntDispatch<1>                     FirstGreaterThanSecondType;  
  typedef IntDispatch<-1>                    FirstLessThanSecondType;  
};

template <unsigned int D1, unsigned int D2>
void ImageToImageFilterDefaultCopyRegion(const typename
                                         BinaryUnsignedIntDispatch<D1, D2>::FirstEqualsSecondType &,
                                         ImageRegion<D1> &destRegion,
                                         const ImageRegion<D2> &srcRegion)
{
  destRegion = srcRegion;
}

template <unsigned int D1, unsigned int D2>
void ImageToImageFilterDefaultCopyRegion(const typename
                                         BinaryUnsignedIntDispatch<D1, D2>::FirstLessThanSecondType &,
                                         ImageRegion<D1> &destRegion,
                                         const ImageRegion<D2> &srcRegion)
{
  // Source dimension is greater than the destination dimension, copy the
  // first part of the source into the destination
  unsigned int dim;
  Index<D1> destIndex;
  Size<D1>  destSize;
  const Index<D2> &srcIndex = srcRegion.GetIndex();
  const Size<D2> &srcSize = srcRegion.GetSize();

  // copy what we can
  for (dim=0; dim < D1; ++dim)
    {
    destIndex[dim] = srcIndex[dim];
    destSize[dim] = srcSize[dim];
    }
    
  destRegion.SetIndex(destIndex);
  destRegion.SetSize(destSize);
}
  
template <unsigned int D1, unsigned int D2>
void ImageToImageFilterDefaultCopyRegion(const typename
                                         BinaryUnsignedIntDispatch<D1, D2>::FirstGreaterThanSecondType &,
                                         ImageRegion<D1> &destRegion,
                                         const ImageRegion<D2> &srcRegion)
{
  // Source dimension is less than the destination dimension, copy source
  // into the first part of the destination and set zeros elsewhere.
  unsigned int dim;
  Index<D1> destIndex;
  Size<D1>  destSize;
  const Index<D2> &srcIndex = srcRegion.GetIndex();
  const Size<D2> &srcSize = srcRegion.GetSize();

  // copy what we can
  for (dim=0; dim < D2; ++dim)
    {
    destIndex[dim] = srcIndex[dim];
    destSize[dim] = srcSize[dim];
    }
  // fill in the rest of the dimensions with zero/one
  for (; dim < D1; ++dim)
    {
    destIndex[dim] = 0;
    destSize[dim] = 1;
    }
  
  destRegion.SetIndex(destIndex);
  destRegion.SetSize(destSize);
}


template <unsigned int D1, unsigned int D2>
class ITK_EXPORT ImageRegionCopier 
{
public:
  virtual void operator() (ImageRegion<D1> &destRegion,
                           const ImageRegion<D2> &srcRegion) const
    {
    typedef typename BinaryUnsignedIntDispatch<D1, D2>::ComparisonType ComparisonType;
    ImageToImageFilterDefaultCopyRegion<D1, D2>(
      ComparisonType(),
      destRegion, srcRegion);
    }
    virtual ~ImageRegionCopier() {}
};


template<unsigned int D1, unsigned int D2>
std::ostream & operator<<(std::ostream &os, const ImageRegionCopier<D1, D2> &
                          copier)
{
  os << "ImageRegionCopier: "
     << typeid(ImageRegionCopier<D1, D2>).name() << std::endl;
  return os;
}

template<unsigned int D1, unsigned int D2>
bool operator!=(const ImageRegionCopier<D1, D2> &c1,
                const ImageRegionCopier<D1, D2> &c2)
{
  return &c1 != &c2;
}

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

//#ifndef ITK_MANUAL_INSTANTIATION
//#include "itkImageToImageFilterDetail.txx"
//#endif

#endif