itkImageBoundaryCondition.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkImageBoundaryCondition_h
#define itkImageBoundaryCondition_h

#include "itkIndex.h"
#include "itkNeighborhood.h"
#include "itkImageRegion.h"

namespace itk
{
template< typename TInputImage, typename TOutputImage = TInputImage >
class ImageBoundaryCondition
{
public:

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef ImageBoundaryCondition Self;

  typedef typename TInputImage::PixelType                       PixelType;
  typedef typename TInputImage::InternalPixelType *             PixelPointerType;
  typedef typename TOutputImage::PixelType                      OutputPixelType;
  typedef Index< itkGetStaticConstMacro(ImageDimension) >       IndexType;
  typedef Size< itkGetStaticConstMacro(ImageDimension) >        SizeType;
  typedef Offset< itkGetStaticConstMacro(ImageDimension) >      OffsetType;
  typedef ImageRegion< itkGetStaticConstMacro(ImageDimension) > RegionType;

  typedef Neighborhood< PixelPointerType,
                        itkGetStaticConstMacro(ImageDimension) > NeighborhoodType;

  typedef typename TInputImage::NeighborhoodAccessorFunctorType
  NeighborhoodAccessorFunctorType;

  ImageBoundaryCondition() {}

  virtual const char * GetNameOfClass() const
  {
    return "itkImageBoundaryCondition";
  }

  virtual void Print( std::ostream & os, Indent i = 0 ) const
  {
    os << i << this->GetNameOfClass() << " (" << this << ")" << std::endl;
  }

  virtual OutputPixelType operator()(const OffsetType & point_index,
                                     const OffsetType & boundary_offset,
                                     const NeighborhoodType *data) const = 0;

  virtual OutputPixelType operator()(
    const OffsetType & point_index,
    const OffsetType & boundary_offset,
    const NeighborhoodType *data,
    const NeighborhoodAccessorFunctorType & neighborhoodAccessorFunctor) const = 0;

  virtual ~ImageBoundaryCondition() {}

  virtual bool RequiresCompleteNeighborhood() { return true; }

  virtual RegionType GetInputRequestedRegion( const RegionType & inputLargestPossibleRegion,
                                              const RegionType & outputRequestedRegion ) const
  {
    (void) outputRequestedRegion;
    return inputLargestPossibleRegion;
  }

  virtual OutputPixelType GetPixel( const IndexType & index,
                                    const TInputImage * image ) const = 0;

};
} // end namespace itk

#endif