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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageConstIterator.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:36 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkImageConstIterator_h |
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#define __itkImageConstIterator_h |
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#include "itkImage.h" |
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#include "itkIndex.h" |
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#include "itkSize.h" |
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#include "itkOffset.h" |
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namespace itk |
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{ |
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/** \class ImageConstIterator |
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* \brief A multi-dimensional image iterator templated over image type. |
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* |
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* ImageConstIterator is a templated class to represent a multi-dimensional |
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* iterator. ImageConstIterator is templated over the type of |
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* the image to be iterated over. |
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* |
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* ImageConstIterator is a base class for all the image iterators. It provides |
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* the basic construction and comparison operations. However, it does not |
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* provide mechanisms for moving the iterator. A subclass of ImageConstIterator |
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* must be used to move the iterator. |
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* |
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* ImageConstIterator is a multi-dimensional iterator, requiring more information |
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* be specified before the iterator can be used than conventional iterators. |
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* Whereas the std::vector::iterator from the STL only needs to be passed |
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* a pointer to establish the iterator, the multi-dimensional image iterator |
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* needs a pointer, the size of the buffer, the size of the region, the |
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* start index of the buffer, and the start index of the region. To gain |
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* access to this information, ImageConstIterator holds a reference to the image |
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* over which it is traversing. |
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* |
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* ImageConstIterator assumes a particular layout of the image data. In particular, |
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* the data is arranged in a 1D array as if it were [][][][slice][row][col] |
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* with Index[0] = col, Index[1] = row, Index[2] = slice, etc. |
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* |
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* \ingroup ImageConstIterators |
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* \par MORE INFORMATION |
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* For a complete description of the ITK Image Iterators and their API, please |
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* see the Iterators chapter in the ITK Software Guide. The ITK Software Guide |
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* is available in print and as a free .pdf download from http://www.itk.org. |
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* |
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* \ingroup ImageIterators |
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* |
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* \sa ImageConstIterator \sa ConditionalConstIterator |
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* \sa ConstNeighborhoodIterator \sa ConstShapedNeighborhoodIterator |
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* \sa ConstSliceIterator \sa CorrespondenceDataStructureIterator |
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* \sa FloodFilledFunctionConditionalConstIterator |
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* \sa FloodFilledImageFunctionConditionalConstIterator |
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* \sa FloodFilledImageFunctionConditionalIterator |
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* \sa FloodFilledSpatialFunctionConditionalConstIterator |
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* \sa FloodFilledSpatialFunctionConditionalIterator |
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* \sa ImageConstIterator \sa ImageConstIteratorWithIndex |
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* \sa ImageIterator \sa ImageIteratorWithIndex |
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* \sa ImageLinearConstIteratorWithIndex \sa ImageLinearIteratorWithIndex |
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* \sa ImageRandomConstIteratorWithIndex \sa ImageRandomIteratorWithIndex |
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* \sa ImageRegionConstIterator \sa ImageRegionConstIteratorWithIndex |
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* \sa ImageRegionExclusionConstIteratorWithIndex |
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* \sa ImageRegionExclusionIteratorWithIndex |
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* \sa ImageRegionIterator \sa ImageRegionIteratorWithIndex |
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* \sa ImageRegionReverseConstIterator \sa ImageRegionReverseIterator |
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* \sa ImageReverseConstIterator \sa ImageReverseIterator |
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* \sa ImageSliceConstIteratorWithIndex \sa ImageSliceIteratorWithIndex |
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* \sa NeighborhoodIterator \sa PathConstIterator \sa PathIterator |
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* \sa ShapedNeighborhoodIterator \sa SliceIterator |
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*/ |
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template<typename TImage> |
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class ITK_EXPORT ImageConstIterator |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef ImageConstIterator Self; |
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/** Dimension of the image the iterator walks. This constant is needed so |
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* functions that are templated over image iterator type (as opposed to |
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* being templated over pixel type and dimension) can have compile time |
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* access to the dimension of the image that the iterator walks. */ |
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itkStaticConstMacro(ImageIteratorDimension, unsigned int, |
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TImage::ImageDimension); |
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/** Index typedef support. */ |
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typedef typename TImage::IndexType IndexType; |
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TDA |
typedef typename TImage::IndexValueType IndexValueType; |
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/** Size typedef support. */ |
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typedef typename TImage::SizeType SizeType; |
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TDA |
typedef typename TImage::SizeValueType SizeValueType; |
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/** Offset typedef support. */ |
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typedef typename TImage::OffsetType OffsetType; |
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TDA |
typedef typename TImage::OffsetValueType OffsetValueType; |
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/** Region typedef support. */ |
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typedef typename TImage::RegionType RegionType; |
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/** Image typedef support. */ |
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typedef TImage ImageType; |
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/** PixelContainer typedef support. Used to refer to the container for |
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* the pixel data. While this was already typdef'ed in the superclass |
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* it needs to be redone here for this subclass to compile properly with gcc. */ |
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typedef typename TImage::PixelContainer PixelContainer; |
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typedef typename PixelContainer::Pointer PixelContainerPointer; |
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/** Internal Pixel Type */ |
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typedef typename TImage::InternalPixelType InternalPixelType; |
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/** External Pixel Type */ |
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typedef typename TImage::PixelType PixelType; |
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/** Accessor type that convert data between internal and external |
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* representations. */ |
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typedef typename TImage::AccessorType AccessorType; |
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typedef typename TImage::AccessorFunctorType AccessorFunctorType; |
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/** Default Constructor. Need to provide a default constructor since we |
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* provide a copy constructor. */ |
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ImageConstIterator() |
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****: m_Region(), |
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******m_PixelAccessor(), |
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******m_PixelAccessorFunctor() |
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**{ |
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m_Image = 0; |
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m_Buffer = 0; |
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m_Offset = 0; |
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m_BeginOffset = 0; |
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m_EndOffset = 0; |
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m_PixelAccessorFunctor.SetBegin( m_Buffer ); |
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**} |
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/** Default Destructor. */ |
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virtual ~ImageConstIterator() {}; |
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/** Copy Constructor. The copy constructor is provided to make sure the |
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* handle to the image is properly reference counted. */ |
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ImageConstIterator(const Self& it) |
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**{ |
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m_Image = it.m_Image; // copy the smart pointer |
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m_Region = it.m_Region; |
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m_Buffer = it.m_Buffer; |
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m_Offset = it.m_Offset; |
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m_BeginOffset = it.m_BeginOffset; |
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m_EndOffset = it.m_EndOffset; |
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m_PixelAccessor = it.m_PixelAccessor; |
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m_PixelAccessorFunctor = it.m_PixelAccessorFunctor; |
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m_PixelAccessorFunctor.SetBegin( m_Buffer ); |
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**} |
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/** Constructor establishes an iterator to walk a particular image and a |
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* particular region of that image. */ |
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ImageConstIterator( const ImageType *ptr, |
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const RegionType ®ion ) |
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**{ |
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m_Image = ptr; |
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m_Buffer = m_Image->GetBufferPointer(); |
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m_Region = region; |
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// Compute the start offset |
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m_Offset = m_Image->ComputeOffset( m_Region.GetIndex() ); |
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m_BeginOffset = m_Offset; |
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// Compute the end offset. If any component of m_Region.GetSize() |
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// is zero, the region is not valid and we set the EndOffset |
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// to be same as BeginOffset so that iterator end condition is met |
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// immediately. |
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if (m_Region.GetNumberOfPixels() == 0) |
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{ |
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// region is empty, probably has a size of 0 along one dimension |
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m_EndOffset = m_BeginOffset; |
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} |
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else |
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{ |
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IndexType ind(m_Region.GetIndex()); |
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SizeType size(m_Region.GetSize()); |
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for (unsigned int i=0; i < ImageIteratorDimension; ++i) |
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{ |
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ind[i] += (static_cast<IndexValueType>(size[i]) - 1); |
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} |
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m_EndOffset = m_Image->ComputeOffset( ind ); |
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m_EndOffset++; |
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} |
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m_PixelAccessor = ptr->GetPixelAccessor(); |
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m_PixelAccessorFunctor.SetPixelAccessor( m_PixelAccessor ); |
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m_PixelAccessorFunctor.SetBegin( m_Buffer ); |
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**} |
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/** operator= is provided to make sure the handle to the image is properly |
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* reference counted. */ |
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Self &operator=(const Self& it) |
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**{ |
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m_Image = it.m_Image; // copy the smart pointer |
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m_Region = it.m_Region; |
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m_Buffer = it.m_Buffer; |
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m_Offset = it.m_Offset; |
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m_BeginOffset = it.m_BeginOffset; |
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m_EndOffset = it.m_EndOffset; |
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m_PixelAccessor = it.m_PixelAccessor; |
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m_PixelAccessorFunctor = it.m_PixelAccessorFunctor; |
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m_PixelAccessorFunctor.SetBegin( m_Buffer ); |
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return *this; |
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**} |
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/** Get the dimension (size) of the index. */ |
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static unsigned int GetImageIteratorDimension() |
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{return ImageIteratorDimension;} |
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/** Comparison operator. Two iterators are the same if they "point to" the |
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* same memory location */ |
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bool |
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operator!=(const Self &it) const |
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{ |
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// two iterators are the same if they "point to" the same memory location |
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return (m_Buffer + m_Offset) != (it.m_Buffer + it.m_Offset); |
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}; |
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/** Comparison operator. Two iterators are the same if they "point to" the |
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* same memory location */ |
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bool |
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operator==(const Self &it) const |
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{ |
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// two iterators are the same if they "point to" the same memory location |
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return (m_Buffer + m_Offset) == (it.m_Buffer + it.m_Offset); |
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}; |
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/** Comparison operator. An iterator is "less than" another if it "points to" |
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* a lower memory location. */ |
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bool |
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operator<=(const Self &it) const |
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{ |
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// an iterator is "less than" another if it "points to" a lower |
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// memory location |
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return (m_Buffer + m_Offset) <= (it.m_Buffer + it.m_Offset); |
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}; |
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/** Comparison operator. An iterator is "less than" another if it "points to" |
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* a lower memory location. */ |
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bool |
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operator<(const Self &it) const |
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{ |
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// an iterator is "less than" another if it "points to" a lower |
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// memory location |
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return (m_Buffer + m_Offset) < (it.m_Buffer + it.m_Offset); |
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}; |
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/** Comparison operator. An iterator is "greater than" another if it |
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* "points to" a higher location. */ |
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bool |
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operator>=(const Self &it) const |
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{ |
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// an iterator is "greater than" another if it "points to" a higher |
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// memory location |
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return (m_Buffer + m_Offset) >= (it.m_Buffer + it.m_Offset); |
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}; |
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/** Comparison operator. An iterator is "greater than" another if it |
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* "points to" a higher location. */ |
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bool |
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operator>(const Self &it) const |
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{ |
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// an iterator is "greater than" another if it "points to" a higher |
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// memory location |
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return (m_Buffer + m_Offset) > (it.m_Buffer + it.m_Offset); |
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}; |
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/** Get the index. This provides a read only reference to the index. |
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* This causes the index to be calculated from pointer arithmetic and is |
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* therefore an expensive operation. |
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* \sa SetIndex */ |
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const IndexType GetIndex() const |
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{ return m_Image->ComputeIndex( static_cast<OffsetValueType>(m_Offset) ); } |
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/** Set the index. No bounds checking is performed. |
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* \sa GetIndex */ |
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virtual void SetIndex(const IndexType &ind) |
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{ m_Offset = m_Image->ComputeOffset( ind ); } |
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/** Get the region that this iterator walks. ImageConstIterators know the |
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* beginning and the end of the region of the image to iterate over. */ |
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const RegionType& GetRegion() const |
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{ return m_Region; }; |
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/** Get the image that this iterator walks. */ |
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const ImageType * GetImage() const |
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{ return m_Image.GetPointer(); }; |
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/** Get the pixel value */ |
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PixelType Get(void) const |
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{ return m_PixelAccessorFunctor.Get(*(m_Buffer+m_Offset)); } |
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/** Return a const reference to the pixel |
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* This method will provide the fastest access to pixel |
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* data, but it will NOT support ImageAdaptors. */ |
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const PixelType & Value(void) const |
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{ return *(m_Buffer + m_Offset); } |
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/** Return an iterator for the beginning of the region. "Begin" |
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* is defined as the first pixel in the region. |
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* \deprecated Use GoToBegin() instead. |
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*/ |
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Self Begin(void) const; |
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*/** Move an iterator to the beginning of the region. "Begin" is |
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*** defined as the first pixel in the region. */ |
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void GoToBegin() |
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{ |
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m_Offset = m_BeginOffset; |
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}; |
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/** Return an iterator for the end of the region. "End" is defined |
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* as one pixel past the last pixel of the region. |
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* \deprecated Use GoToEnd() instead. |
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*/ |
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Self End(void) const; |
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|
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*/** Move an iterator to the end of the region. "End" is defined as |
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*** one pixel past the last pixel of the region. */ |
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void GoToEnd() |
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{ |
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m_Offset = m_EndOffset; |
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}; |
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/** Is the iterator at the beginning of the region? "Begin" is defined |
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* as the first pixel in the region. */ |
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bool IsAtBegin(void) const |
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{ |
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return (m_Offset == m_BeginOffset); |
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} |
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/** Is the iterator at the end of the region? "End" is defined as one |
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* pixel past the last pixel of the region. */ |
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bool IsAtEnd(void) const |
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{ |
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return (m_Offset == m_EndOffset); |
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} |
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protected: //made protected so other iterators can access |
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typename TImage::ConstWeakPointer m_Image; |
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RegionType m_Region; // region to iterate over |
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|
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unsigned long m_Offset; |
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unsigned long m_BeginOffset; // offset to first pixel in region |
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unsigned long m_EndOffset; // offset to one pixel past last pixel in region |
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const InternalPixelType * m_Buffer; |
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AccessorType m_PixelAccessor; |
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AccessorFunctorType m_PixelAccessorFunctor; |
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}; |
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} // end namespace itk |
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|
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkImageConstIterator.txx" |
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#endif |
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#endif |
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