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itkImageReverseConstIterator.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkImageReverseConstIterator.h,v $
00005   Language:  C++
00006   Date:      $Date: 2008-10-18 21:13:25 $
00007   Version:   $Revision: 1.10 $
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      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef __itkImageReverseConstIterator_h
00018 #define __itkImageReverseConstIterator_h
00019 
00020 #include "itkIndex.h"
00021 #include "itkSize.h"
00022 #include "itkImage.h"
00023 #include "itkImageConstIterator.h"
00024 #include <memory>
00025 
00026 namespace itk
00027 {
00028 
00086 template<typename TImage>
00087 class ITK_EXPORT ImageReverseConstIterator
00088 {
00089 public:
00091   typedef ImageReverseConstIterator Self;
00092 
00097   itkStaticConstMacro(ImageIteratorDimension, unsigned int,
00098                       TImage::ImageDimension);
00099 
00101   typedef typename TImage::IndexType        IndexType;
00102   typedef typename TImage::IndexValueType   IndexValueType;
00103 
00105   typedef typename TImage::SizeType         SizeType;
00106   typedef typename TImage::SizeValueType    SizeValueType;
00107 
00109   typedef typename TImage::OffsetType       OffsetType;
00110   typedef typename TImage::OffsetValueType  OffsetValueType;
00111 
00113   typedef typename TImage::RegionType       RegionType;
00114 
00116   typedef TImage   ImageType;
00117 
00121   typedef typename TImage::PixelContainer   PixelContainer;
00122   typedef typename PixelContainer::Pointer  PixelContainerPointer;
00123 
00125   typedef typename TImage::InternalPixelType   InternalPixelType;
00126 
00128   typedef typename TImage::PixelType   PixelType;
00129 
00132   typedef typename TImage::AccessorType     AccessorType;
00133 
00135   typedef typename TImage::AccessorFunctorType     AccessorFunctorType;
00136 
00139   ImageReverseConstIterator() :m_PixelAccessor(), m_PixelAccessorFunctor()
00140     {
00141     m_Buffer = 0;
00142     m_Offset = 0;
00143     m_BeginOffset = 0;
00144     m_EndOffset = 0;
00145     m_PixelAccessorFunctor.SetBegin( m_Buffer );
00146     }
00148 
00150   virtual ~ImageReverseConstIterator() {};
00151 
00154   ImageReverseConstIterator(const Self& it)
00155     {
00156     m_Image = it.m_Image;     // copy the smart pointer
00157 
00158     m_Region = it.m_Region;
00159     
00160     m_Buffer = it.m_Buffer;
00161     m_Offset = it.m_Offset;
00162     m_BeginOffset = it.m_BeginOffset;
00163     m_EndOffset = it.m_EndOffset;
00164     m_PixelAccessor = it.m_PixelAccessor;
00165     m_PixelAccessorFunctor = it.m_PixelAccessorFunctor;
00166     m_PixelAccessorFunctor.SetBegin( m_Buffer );
00167     }
00168 
00171   ImageReverseConstIterator(ImageType *ptr, const RegionType &region)
00172     {
00173     unsigned long offset;
00174     m_Image = ptr;
00175     m_Buffer = m_Image->GetBufferPointer();
00176     m_Region = region;
00178 
00179     // Compute the end offset, one pixel before the first pixel
00180     offset = m_Image->ComputeOffset( m_Region.GetIndex() );
00181     m_EndOffset = offset-1;
00182     
00183     // Compute the begin offset, the last pixel in the region
00184     IndexType ind(m_Region.GetIndex());
00185     SizeType size(m_Region.GetSize());
00186     for (unsigned int i=0; i < TImage::ImageDimension; ++i)
00187       {
00188       ind[i] += (size[i] - 1);
00189       }
00190     m_BeginOffset = m_Image->ComputeOffset( ind );
00191     m_Offset = m_BeginOffset;
00192 
00193     m_PixelAccessor = ptr->GetPixelAccessor();
00194     m_PixelAccessorFunctor.SetPixelAccessor( m_PixelAccessor );
00195     m_PixelAccessorFunctor.SetBegin( m_Buffer );
00196     }
00197   
00205   ImageReverseConstIterator( const ImageConstIterator<TImage> &it)
00206     {
00207     m_Image = it.GetImage();
00208     m_Region = it.GetRegion();
00209     m_Buffer = m_Image->GetBufferPointer();
00211 
00212     IndexType ind = it.GetIndex();
00213 
00214     m_Offset = m_Image->ComputeOffset( ind );
00215 
00216     // Compute the end offset, one pixel before the first pixel
00217     m_EndOffset = m_Image->ComputeOffset( m_Region.GetIndex() ) - 1;
00218     
00219     // Compute the begin offset, the last pixel in the region
00220     IndexType regInd(m_Region.GetIndex());
00221     SizeType regSize(m_Region.GetSize());
00222     for (unsigned int i=0; i < TImage::ImageDimension; ++i)
00223       {
00224       regInd[i] += (regSize[i] - 1);
00225       }
00226     m_BeginOffset = m_Image->ComputeOffset( regInd );
00227     
00228     m_PixelAccessor = m_Image->GetPixelAccessor();
00229     m_PixelAccessorFunctor.SetPixelAccessor( m_PixelAccessor );
00230     m_PixelAccessorFunctor.SetBegin( m_Buffer );
00231     }
00232 
00235   Self &operator=(const Self& it)
00236     {
00237     m_Image = it.m_Image;     // copy the smart pointer
00238     m_Region = it.m_Region;
00239 
00240     m_Buffer = it.m_Buffer;
00241     m_Offset = it.m_Offset;
00242     m_BeginOffset = it.m_BeginOffset;
00243     m_EndOffset = it.m_EndOffset;
00244     m_PixelAccessor = it.m_PixelAccessor;
00245     m_PixelAccessorFunctor.SetPixelAccessor( m_PixelAccessor );
00246     m_PixelAccessorFunctor.SetBegin( m_Buffer );
00247     return *this;
00248     }
00249   
00252   Self &operator=(const ImageConstIterator<TImage>& it)
00253     {
00254     m_Image = it.GetImage();
00255     m_Region = it.GetRegion();
00256     m_Buffer = m_Image->GetBufferPointer();
00258 
00259     IndexType ind = it.GetIndex();
00260 
00261     m_Offset = m_Image->ComputeOffset( ind );
00262 
00263     // Compute the end offset, one pixel before the first pixel
00264     m_EndOffset = m_Image->ComputeOffset( m_Region.GetIndex() ) - 1;
00265     
00266     // Compute the begin offset, the last pixel in the region
00267     IndexType regInd(m_Region.GetIndex());
00268     SizeType regSize(m_Region.GetSize());
00269     for (unsigned int i=0; i < TImage::ImageDimension; ++i)
00270       {
00271       regInd[i] += (regSize[i] - 1);
00272       }
00273     m_BeginOffset = m_Image->ComputeOffset( regInd );
00274     
00275     m_PixelAccessor = m_Image->GetPixelAccessor();
00276     m_PixelAccessorFunctor.SetPixelAccessor( m_PixelAccessor );
00277     m_PixelAccessorFunctor.SetBegin( m_Buffer );
00278     
00279     return *this;
00280     }
00281   
00283   static unsigned int GetImageIteratorDimension() 
00284     {return TImage::ImageDimension;}
00285 
00288   bool
00289   operator!=(const Self &it) const
00290     {
00291     // two iterators are the same if they "point to" the same memory location
00292     return (m_Buffer + m_Offset) != (it.m_Buffer + it.m_Offset);
00293     }
00294 
00297   bool
00298   operator==(const Self &it) const
00299     {
00300     // two iterators are the same if they "point to" the same memory location
00301     return (m_Buffer + m_Offset) == (it.m_Buffer + it.m_Offset);
00302     }
00303 
00308   const IndexType GetIndex()
00309     { return m_Image->ComputeIndex( m_Offset );  }
00310 
00313   virtual void SetIndex(const IndexType &ind)
00314     { m_Offset = m_Image->ComputeOffset( ind ); }
00315 
00316 
00319   const RegionType& GetRegion() const
00320     { return m_Region; }
00321 
00323   const PixelType Get(void) const  
00324     { return m_PixelAccessorFunctor.Get(*(m_Buffer+m_Offset)); }
00325 
00327   void Set( const PixelType & value) const  
00328     { 
00329     this->m_PixelAccessorFunctor.Set(*(const_cast<InternalPixelType *>(
00330             this->m_Buffer+this->m_Offset)),value);
00331     }
00332 
00336   const PixelType & Value(void) const  
00337     { return *(m_Buffer+m_Offset); }
00338 
00342   const PixelType & Value(void) 
00343     { return *(m_Buffer+m_Offset); }
00344 
00348   Self Begin() const;
00349 
00352   void GoToBegin()
00353     {
00354     m_Offset = m_BeginOffset;
00355     }
00356 
00360   Self End() const;
00361 
00364   void GoToEnd()
00365     {
00366     m_Offset = m_EndOffset;
00367     }
00368 
00371   bool IsAtBegin()
00372     {
00373     return (m_Offset == m_BeginOffset);
00374     }
00375 
00378   bool IsAtEnd()
00379     {
00380     return (m_Offset == m_EndOffset);
00381     }
00382 
00383 protected: //made protected so other iterators can access 
00384   typename ImageType::ConstWeakPointer    m_Image;
00385   RegionType                              m_Region; // region to iterate over
00386   
00387   unsigned long  m_Offset;
00388   unsigned long  m_BeginOffset; // offset to last pixel in region
00389   unsigned long  m_EndOffset;   // offset to one pixel before first pixel
00390 
00391   const InternalPixelType        *m_Buffer;
00392 
00393   AccessorType                    m_PixelAccessor;
00394   AccessorFunctorType             m_PixelAccessorFunctor;
00395 };
00396 
00397 } // end namespace itk
00398 
00399 // Define instantiation macro for this template.
00400 #define ITK_TEMPLATE_ImageReverseConstIterator(_, EXPORT, x, y) namespace itk { \
00401   _(1(class EXPORT ImageReverseConstIterator< ITK_TEMPLATE_1 x >)) \
00402   namespace Templates { typedef ImageReverseConstIterator< ITK_TEMPLATE_1 x > ImageReverseConstIterator##y; } \
00403   }
00404 
00405 #if ITK_TEMPLATE_EXPLICIT
00406 # include "Templates/itkImageReverseConstIterator+-.h"
00407 #endif
00408 
00409 #if ITK_TEMPLATE_TXX
00410 # include "itkImageReverseConstIterator.txx"
00411 #endif
00412 
00413 #endif 
00414 

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