itkVectorImageToImageAdaptor.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 itkVectorImageToImageAdaptor_h
#define itkVectorImageToImageAdaptor_h
 
#include "itkImageAdaptor.h"
#include "itkVectorImage.h"
 
namespace itk
{
namespace Accessor
{
template <typename TType>
class VectorImageToImagePixelAccessor : private DefaultVectorPixelAccessor<TType>
{
public:
  using VectorLengthType = unsigned int;
 
  using ExternalType = TType;
 
  using InternalType = TType;
 
  using ActualPixelType = VariableLengthVector<TType>;
 
  inline void
  Set(ActualPixelType output, const ExternalType & input) const
  {
    output[m_ComponentIdx] = input;
  }
 
  inline void
  Set(InternalType & output, const ExternalType & input, const unsigned long offset) const
  {
    return Set(Superclass::Get(output, offset), input);
  }
 
  inline ExternalType
  Get(const ActualPixelType & input) const
  {
    ExternalType output = input[m_ComponentIdx];
    return output;
  }
 
  inline ExternalType
  Get(const InternalType & input, const SizeValueType offset) const
  {
    return Get(Superclass::Get(input, offset));
  }
 
  void
  SetExtractComponentIdx(VectorLengthType idx)
  {
    m_ComponentIdx = idx;
  }
 
  VectorLengthType
  GetExtractComponentIdx() const
  {
    return m_ComponentIdx;
  }
 
  void
  SetVectorLength(VectorLengthType l)
  {
    Superclass::SetVectorLength(l);
  }
 
  VectorLengthType
  GetVectorLength() const
  {
    return Superclass::GetVectorLength();
  }
 
  VectorImageToImagePixelAccessor(unsigned int length = 1) { Superclass::SetVectorLength(length); }
 
protected:
  using Superclass = DefaultVectorPixelAccessor<TType>;
 
private:
  VectorLengthType m_ComponentIdx{ 0 };
};
} // end namespace Accessor
 
template <typename TPixelType, unsigned int Dimension>
class VectorImageToImageAdaptor
  : public ImageAdaptor<VectorImage<TPixelType, Dimension>, Accessor::VectorImageToImagePixelAccessor<TPixelType>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(VectorImageToImageAdaptor);
 
  using Self = VectorImageToImageAdaptor;
  using VectorImageType = VectorImage<TPixelType, Dimension>;
  using Superclass = ImageAdaptor<VectorImageType, Accessor::VectorImageToImagePixelAccessor<TPixelType>>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkNewMacro(Self);
 
  itkOverrideGetNameOfClassMacro(VectorImageToImageAdaptor);
 
  using typename Superclass::PixelContainer;
  using typename Superclass::PixelContainerPointer;
  using typename Superclass::PixelContainerConstPointer;
  using typename Superclass::IOPixelType;
 
  using VectorLengthType = typename VectorImageType::VectorLengthType;
 
  // Set/GetMethods to set the component to be extracted.
  void
  SetExtractComponentIndex(VectorLengthType componentIdx)
  {
    this->GetPixelAccessor().SetExtractComponentIdx(componentIdx);
  }
 
  // Set/GetMethods to set the component to be extracted.
  VectorLengthType
  GetExtractComponentIndex() const
  {
    return this->GetPixelAccessor().GetExtractComponentIdx();
  }
 
protected:
  VectorImageToImageAdaptor() = default;
  ~VectorImageToImageAdaptor() override = default;
};
} // end namespace itk
 
#endif