itkInvertIntensityImageFilter.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 itkInvertIntensityImageFilter_h
#define itkInvertIntensityImageFilter_h
 
#include "itkUnaryFunctorImageFilter.h"
 
namespace itk
{
namespace Functor
{
template <typename TInput, typename TOutput>
class ITK_TEMPLATE_EXPORT InvertIntensityTransform
{
public:
  using RealType = typename NumericTraits<TInput>::RealType;
  InvertIntensityTransform() { m_Maximum = NumericTraits<TInput>::max(); }
  ~InvertIntensityTransform() = default;
 
  void
  SetMaximum(TOutput max)
  {
    m_Maximum = max;
  }
 
 
  bool
  operator==(const InvertIntensityTransform & other) const
  {
    return m_Maximum == other.m_Maximum;
  }
 
  ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(InvertIntensityTransform);
 
  inline TOutput
  operator()(const TInput & x) const
  {
    auto result = static_cast<TOutput>(m_Maximum - x);
 
    return result;
  }
 
private:
  TInput m_Maximum;
};
} // end namespace Functor

template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT InvertIntensityImageFilter
  : public UnaryFunctorImageFilter<
      TInputImage,
      TOutputImage,
      Functor::InvertIntensityTransform<typename TInputImage::PixelType, typename TOutputImage::PixelType>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(InvertIntensityImageFilter);

  using Self = InvertIntensityImageFilter;
  using Superclass = UnaryFunctorImageFilter<
    TInputImage,
    TOutputImage,
    Functor::InvertIntensityTransform<typename TInputImage::PixelType, typename TOutputImage::PixelType>>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  using OutputPixelType = typename TOutputImage::PixelType;
  using InputPixelType = typename TInputImage::PixelType;
  using RealType = typename NumericTraits<InputPixelType>::RealType;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(InvertIntensityImageFilter);

  itkSetMacro(Maximum, InputPixelType);
  itkGetConstReferenceMacro(Maximum, InputPixelType);
  void
  PrintSelf(std::ostream & os, Indent indent) const override;

  void
  BeforeThreadedGenerateData() override;
 
  itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<InputPixelType>));
 
protected:
  InvertIntensityImageFilter();
  ~InvertIntensityImageFilter() override = default;
 
private:
  InputPixelType m_Maximum{};
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkInvertIntensityImageFilter.hxx"
#endif
 
#endif