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itkImageToImageFilterDetail.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkImageToImageFilterDetail.h,v $
00005   Language:  C++
00006   Date:      $Date: 2005/05/13 19:44:21 $
00007   Version:   $Revision: 1.8 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012   Portions of this code are covered under the VTK copyright.
00013   See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details.
00014 
00015      This software is distributed WITHOUT ANY WARRANTY; without even 
00016      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00017      PURPOSE.  See the above copyright notices for more information.
00018 
00019 =========================================================================*/
00020 #ifndef __itkImageToImageFilterDetail_h
00021 #define __itkImageToImageFilterDetail_h
00022 
00023 #include "itkImageRegion.h"
00024 #include "itkSmartPointer.h"
00025 
00026 namespace itk
00027 {
00028 
00037 namespace ImageToImageFilterDetail
00038 {
00039 
00048   struct DispatchBase {};
00049 
00057   template <bool>
00058   struct BooleanDispatch {};
00059 
00068   template <int>
00069   struct IntDispatch : public DispatchBase {};
00070 
00085   template <unsigned int>
00086   struct UnsignedIntDispatch : public DispatchBase {};
00088 
00096   template <bool B1, bool B2>
00097   struct BinaryBooleanDispatch
00098   {
00099 
00102     typedef BooleanDispatch<B1> FirstType;
00103     typedef BooleanDispatch<B2> SecondType;
00104   };
00105 
00112   template <int D1, int D2>
00113   struct BinaryIntDispatch
00114   {
00115 
00118     typedef IntDispatch<D1> FirstType;
00119     typedef IntDispatch<D2> SecondType;
00120   };
00121 
00133   template <unsigned int D1, unsigned int D2>
00134   struct BinaryUnsignedIntDispatch : public DispatchBase
00135   {
00136 
00139     typedef UnsignedIntDispatch<D1> FirstType;
00140     typedef UnsignedIntDispatch<D2> SecondType;
00141 
00157     typedef IntDispatch<(D1 > D2) - (D1 < D2)> ComparisonType;
00158     typedef IntDispatch<0>  FirstEqualsSecondType;  
00159     typedef IntDispatch<1>  FirstGreaterThanSecondType;  
00160     typedef IntDispatch<-1> FirstLessThanSecondType;  
00161   };
00162 
00179   template <unsigned int D1, unsigned int D2>
00180   void ImageToImageFilterDefaultCopyRegion(const typename
00181                   BinaryUnsignedIntDispatch<D1, D2>::FirstEqualsSecondType &,
00182                   ImageRegion<D1> &destRegion,
00183                   const ImageRegion<D2> &srcRegion)
00184   {
00185     destRegion = srcRegion;
00186   }
00187 
00204   template <unsigned int D1, unsigned int D2>
00205   void ImageToImageFilterDefaultCopyRegion(const typename
00206                   BinaryUnsignedIntDispatch<D1, D2>::FirstLessThanSecondType &,
00207                   ImageRegion<D1> &destRegion,
00208                   const ImageRegion<D2> &srcRegion)
00209   {
00210     // Source dimension is greater than the destination dimension, copy the
00211     // first part of the source into the destination
00212     unsigned int dim;
00213     Index<D1> destIndex;
00214     Size<D1>  destSize;
00215     const Index<D2> &srcIndex = srcRegion.GetIndex();
00216     const Size<D2> &srcSize = srcRegion.GetSize();
00218 
00219     // copy what we can
00220     for (dim=0; dim < D1; ++dim)
00221       {
00222       destIndex[dim] = srcIndex[dim];
00223       destSize[dim] = srcSize[dim];
00224       }
00225     
00226     destRegion.SetIndex(destIndex);
00227     destRegion.SetSize(destSize);
00228   }
00229   
00246   template <unsigned int D1, unsigned int D2>
00247   void ImageToImageFilterDefaultCopyRegion(const typename
00248                BinaryUnsignedIntDispatch<D1, D2>::FirstGreaterThanSecondType &,
00249                ImageRegion<D1> &destRegion,
00250                const ImageRegion<D2> &srcRegion)
00251   {
00252     // Source dimension is less than the destination dimension, copy source
00253     // into the first part of the destination and set zeros elsewhere.
00254     unsigned int dim;
00255     Index<D1> destIndex;
00256     Size<D1>  destSize;
00257     const Index<D2> &srcIndex = srcRegion.GetIndex();
00258     const Size<D2> &srcSize = srcRegion.GetSize();
00260 
00261     // copy what we can
00262     for (dim=0; dim < D2; ++dim)
00263       {
00264       destIndex[dim] = srcIndex[dim];
00265       destSize[dim] = srcSize[dim];
00266       }
00267     // fill in the rest of the dimensions with zero/one
00268     for (; dim < D1; ++dim)
00269       {
00270       destIndex[dim] = 0;
00271       destSize[dim] = 1;
00272       }
00273     
00274     destRegion.SetIndex(destIndex);
00275     destRegion.SetSize(destSize);
00276   }
00277 
00278 
00315   template <unsigned int D1, unsigned int D2>
00316     class ITK_EXPORT ImageRegionCopier 
00317   {
00318   public:
00319     virtual void operator() (ImageRegion<D1> &destRegion,
00320                             const ImageRegion<D2> &srcRegion) const
00321     {
00322       typedef typename BinaryUnsignedIntDispatch<D1, D2>::ComparisonType ComparisonType;
00323       ImageToImageFilterDefaultCopyRegion<D1, D2>(
00324                       ComparisonType(),
00325                       destRegion, srcRegion);
00326     }
00327     virtual ~ImageRegionCopier() {}
00328   };
00329 
00330 
00333   template<unsigned int D1, unsigned int D2>
00334   std::ostream & operator<<(std::ostream &os, const ImageRegionCopier<D1, D2> &
00335                             copier)
00336   {
00337     os << "ImageRegionCopier: "
00338        << typeid(ImageRegionCopier<D1, D2>).name() << std::endl;
00339     return os;
00340   }
00342 
00344   template<unsigned int D1, unsigned int D2>
00345   bool operator!=(const ImageRegionCopier<D1, D2> &c1,
00346                   const ImageRegionCopier<D1, D2> &c2)
00347   {
00348     return &c1 != &c2;
00349   }
00350 
00351 } // end of namespace ImageToImageFilterDetail
00352     
00353 } // end namespace itk
00354 
00355 //#ifndef ITK_MANUAL_INSTANTIATION
00356 //#include "itkImageToImageFilterDetail.txx"
00357 //#endif
00358 
00359 #endif
00360 

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