itkComplexToImaginaryImageFilter.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 itkComplexToImaginaryImageFilter_h
#define itkComplexToImaginaryImageFilter_h

#include "itkUnaryGeneratorImageFilter.h"
#include "itkMath.h"

namespace itk
{
namespace Functor
{
template< typename TInput, typename TOutput >
class ComplexToImaginary
{
public:
  ComplexToImaginary() = default;
  ~ComplexToImaginary() = default;
  bool operator!=(const ComplexToImaginary &) const
  {
    return false;
  }

  bool operator==(const ComplexToImaginary & other) const
  {
    return !( *this != other );
  }

  inline TOutput operator()(const TInput & A) const
  {
    return static_cast<TOutput>( A.imag() );
  }
};
}

template< typename TInputImage, typename TOutputImage >
class ComplexToImaginaryImageFilter:
  public
  UnaryGeneratorImageFilter< TInputImage, TOutputImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(ComplexToImaginaryImageFilter);

  using Self = ComplexToImaginaryImageFilter;
  using Superclass = UnaryGeneratorImageFilter< TInputImage, TOutputImage >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;
  using FunctorType = Functor::ComplexToImaginary< typename TInputImage::PixelType,
                                                   typename TOutputImage::PixelType >;

  itkNewMacro(Self);

  itkTypeMacro(ComplexToImaginaryImageFilter,
               UnaryGeneratorImageFilter);

  using InputPixelType = typename TInputImage::PixelType;
  using OutputPixelType = typename TOutputImage::PixelType;
  using InputPixelValueType = typename NumericTraits< InputPixelType >::ValueType;

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< InputPixelValueType, OutputPixelType > ) );
  // End concept checking
#endif

protected:
  ComplexToImaginaryImageFilter()
    {
#if !defined( ITK_WRAPPING_PARSER )
      Superclass::SetFunctor(FunctorType());
#endif
    }
  ~ComplexToImaginaryImageFilter() override = default;
};
} // end namespace itk

#endif