itkConstantBoundaryCondition.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 itkConstantBoundaryCondition_h
#define itkConstantBoundaryCondition_h

#include "itkNumericTraits.h"
#include "itkImageBoundaryCondition.h"

namespace itk
{
// Forward reference for VariableLengthVector
template <typename TValue> class VariableLengthVector;

template< typename TInputImage, typename TOutputImage = TInputImage >
class ConstantBoundaryCondition:
    public ImageBoundaryCondition< TInputImage, TOutputImage >
{
public:
  typedef ConstantBoundaryCondition                           Self;
  typedef ImageBoundaryCondition< TInputImage, TOutputImage > Superclass;

  typedef typename Superclass::PixelType        PixelType;
  typedef typename Superclass::PixelPointerType PixelPointerType;
  typedef typename Superclass::OutputPixelType  OutputPixelType;
  typedef typename Superclass::RegionType       RegionType;
  typedef typename Superclass::IndexType        IndexType;
  typedef typename Superclass::SizeType         SizeType;
  typedef typename Superclass::OffsetType       OffsetType;
  typedef typename Superclass::NeighborhoodType NeighborhoodType;

  typedef typename Superclass::NeighborhoodAccessorFunctorType
  NeighborhoodAccessorFunctorType;

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

  ConstantBoundaryCondition();

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

  virtual void Print( std::ostream & os, Indent i = 0 ) const;

  template < typename TPixel >
  void Initialize( const VariableLengthVector< TPixel > * );

  virtual OutputPixelType operator()(const OffsetType &,
                                     const OffsetType &,
                                     const NeighborhoodType *) const;

  virtual OutputPixelType operator()(
    const OffsetType &,
    const OffsetType &,
    const NeighborhoodType *,
    const NeighborhoodAccessorFunctorType &) const;

  void SetConstant(const OutputPixelType & c);

  const OutputPixelType & GetConstant() const;

  bool RequiresCompleteNeighborhood() { return false; }

  virtual RegionType GetInputRequestedRegion( const RegionType & inputLargestPossibleRegion,
                                              const RegionType & outputRequestedRegion ) const;

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

private:
  OutputPixelType m_Constant;
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkConstantBoundaryCondition.hxx"
#endif

#endif