itkDivideImageFilter.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 itkDivideImageFilter_h
#define itkDivideImageFilter_h

#include "itkBinaryGeneratorImageFilter.h"
#include "itkArithmeticOpsFunctors.h"
#include "itkNumericTraits.h"
#include "itkMath.h"

namespace itk
{

template< typename TInputImage1, typename TInputImage2, typename TOutputImage >
class ITK_TEMPLATE_EXPORT DivideImageFilter:
  public
  BinaryGeneratorImageFilter< TInputImage1, TInputImage2, TOutputImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(DivideImageFilter);

  using Self = DivideImageFilter;

  using Superclass = BinaryGeneratorImageFilter< TInputImage1, TInputImage2, TOutputImage >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;
  using FunctorType = Functor::Div< typename TInputImage1::PixelType,
                                    typename TInputImage2::PixelType,
                                    typename TOutputImage::PixelType >;

  itkNewMacro(Self);

  itkTypeMacro(DivideImageFilter,
               BinaryGeneratorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( IntConvertibleToInput2Check,
                   ( Concept::Convertible< int, typename TInputImage2::PixelType > ) );
  itkConceptMacro( Input1Input2OutputDivisionOperatorsCheck,
                   ( Concept::DivisionOperators< typename TInputImage1::PixelType,
                                                 typename TInputImage2::PixelType,
                                                 typename TOutputImage::PixelType > ) );
  // End concept checking
#endif

protected:
  DivideImageFilter()
    {
#if !defined( ITK_WRAPPING_PARSER )
    Superclass::SetFunctor(FunctorType());
#endif
    }

  ~DivideImageFilter() override = default;

  void VerifyPreconditions() ITKv5_CONST override
  {
    Superclass::VerifyPreconditions();

    const auto *input
       = dynamic_cast< const typename Superclass::DecoratedInput2ImagePixelType * >( this->ProcessObject::GetInput(1) );
    if( input != nullptr && itk::Math::AlmostEquals(input->Get(), itk::NumericTraits< typename TInputImage2::PixelType >::ZeroValue()) )
      {
      itkGenericExceptionMacro(<<"The constant value used as denominator should not be set to zero");
      }
  }
};

} // end namespace itk

#endif