itkDefaultVectorPixelAccessorFunctor.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 __itkDefaultVectorPixelAccessorFunctor_h
#define __itkDefaultVectorPixelAccessorFunctor_h

#include "itkMacro.h"

namespace itk
{
template< typename TImageType >
class DefaultVectorPixelAccessorFunctor
{
public:

  typedef TImageType                            ImageType;
  typedef typename ImageType::InternalPixelType InternalPixelType;
  typedef typename ImageType::PixelType         ExternalPixelType;
  typedef typename ImageType::AccessorType      PixelAccessorType;
  typedef unsigned int                          VectorLengthType;


  template <typename UImageType>
  struct Rebind
    {
      typedef DefaultVectorPixelAccessorFunctor<UImageType>  Type;
    };


  static void SetVectorLength(ImageType *image, VectorLengthType length)
  {
    image->SetVectorLength(length);
  }

  static VectorLengthType GetVectorLength(const ImageType *image)
  {
    return image->GetVectorLength();
  }


  DefaultVectorPixelAccessorFunctor () : m_Begin(ITK_NULLPTR) {}

  inline void SetPixelAccessor(PixelAccessorType & accessor)
  {
    m_PixelAccessor = accessor;
  }

  inline void SetBegin(const InternalPixelType *begin)
  { this->m_Begin = const_cast< InternalPixelType * >( begin ); }

  inline void Set(InternalPixelType & output, const ExternalPixelType & input) const
  {
    m_PixelAccessor.Set(output, input, ( &output ) - m_Begin);
  }

  inline ExternalPixelType Get(const InternalPixelType & input) const
  {
    return m_PixelAccessor.Get(input, &input  - m_Begin);
  }

private:
  PixelAccessorType  m_PixelAccessor;    // The pixel accessor
  InternalPixelType *m_Begin;            // Begin of the buffer
};
}

#endif