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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkExtractImageFilterRegionCopier.h,v $
Language: C++
Date: $Date: 2004-12-21 22:47:30 $
Version: $Revision: 1.6 $
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 __itkExtractImageFilterRegionCopier_h
#define __itkExtractImageFilterRegionCopier_h
#include "itkImageToImageFilterDetail.h"
namespace itk
{
namespace ImageToImageFilterDetail
{
/**
* Call the base class version: ImageToImageFilterDefaultCopyRegion
*/
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);
}
/**
* Call the base class version: ImageToImageFilterDefaultCopyRegion
*/
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);
}
/**
* Copy an image region (start index and size) for the case where
* the source region has a lesser dimension than the destination
* region. This version is "smart" in that it looks at what
* dimensions should be collapsed. This information is passed in
* the parameter totalInputExtractionRegion. Any values within
* totalInputExtractionRegion.Size that are zero correspond to the
* dimension to be collapsed.
*
* Note that the use of source and destination reflect where
* where is information is coming from and going to. When used
* in the pipeline mechanism, the region requested by the output
* of a filter is used to define the region required on the input.
* In this case the output of the filter is the source and the
* input of the filter is the destination.
*/
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);
}
/**
* ExtractImageFilterRegionCopier is a special variation on ImageRegionCopier.
* The difference in this version is when the D1 > D2. In this case, the
* output image has fewer dimension than the input image. This only works correctly
* when totalInputExtractionRegion has been set. totalInputExtractionRegion is
* essentially the mapping from the srcRegion space to the DestRegionSpace.
* The important values in totalInputExtractionRegion are when
* totalInputExtractionRegion.Size is = 0 for one or more of the dimensions.
* These values correspond to the dimensions to collapse. When
* totalInputExtractionRegion.Size[dim] = 0, then the index that we have to lock
* destRegion.Index[dim] = totalInputExtractionRegion.Index[dim].
*
* The other two cases (D1 = D2, and D1 < D2) are identical to the implementation
* in ImageToImageFilterDetail.
*
*
**/
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
{
typedef typename BinaryUnsignedIntDispatch<D1, D2>::ComparisonType ComparisonType;
ExtractImageFilterCopyRegion<D1, D2>(ComparisonType(),
destRegion, srcRegion, totalInputExtractionRegion);
}
/** Duplicate the superclass method to avoid warnings. */
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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