itkDefaultVectorPixelAccessorFunctor.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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:
  using ImageType = TImageType;
  using InternalPixelType = typename ImageType::InternalPixelType;
  using ExternalPixelType = typename ImageType::PixelType;
  using PixelAccessorType = typename ImageType::AccessorType;
  using VectorLengthType = unsigned int;
 
 
  template <typename UImageType>
  struct Rebind
  {
    using Type = DefaultVectorPixelAccessorFunctor<UImageType>;
  };
 
 
  static void
  SetVectorLength(ImageType * image, VectorLengthType length)
  {
    image->SetVectorLength(length);
  }
 
  static VectorLengthType
  GetVectorLength(const ImageType * image)
  {
    return image->GetVectorLength();
  }
 
 
  DefaultVectorPixelAccessorFunctor() = default;
 
  inline void
  SetPixelAccessor(const 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{ nullptr }; // Begin of the buffer
};
} // namespace itk
 
#endif