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 "itkBinaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
#include "itkMath.h"

namespace itk
{
namespace Functor
{
template< typename TInput1, typename TInput2, typename TOutput >
class ITK_TEMPLATE_EXPORT Div
{
public:
  Div() {}
  ~Div() {}
  bool operator!=(const Div &) const
  {
    return false;
  }

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

  inline TOutput operator()(const TInput1 & A, const TInput2 & B) const
  {
    if ( itk::Math::NotAlmostEquals(B, NumericTraits<TInput2>::ZeroValue()) )
      {
      return (TOutput)( A / B );
      }
    else
      {
      return NumericTraits< TOutput >::max( static_cast<TOutput>(A) );
      }
  }
};
}
template< typename TInputImage1, typename TInputImage2, typename TOutputImage >
class ITK_TEMPLATE_EXPORT DivideImageFilter:
  public
  BinaryFunctorImageFilter< TInputImage1, TInputImage2, TOutputImage,
                            Functor::Div<
                              typename TInputImage1::PixelType,
                              typename TInputImage2::PixelType,
                              typename TOutputImage::PixelType >   >
{
public:
  typedef DivideImageFilter Self;

  typedef BinaryFunctorImageFilter< TInputImage1, TInputImage2, TOutputImage,
                                    Functor::Div<
                                      typename TInputImage1::PixelType,
                                      typename TInputImage2::PixelType,
                                      typename TOutputImage::PixelType >
                                    > Superclass;

  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(DivideImageFilter,
               BinaryFunctorImageFilter);

#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() {}
  virtual ~DivideImageFilter() {}

  void GenerateData() ITK_OVERRIDE
    {
    const typename Superclass::DecoratedInput2ImagePixelType *input
       = dynamic_cast< const typename Superclass::DecoratedInput2ImagePixelType * >(
        this->ProcessObject::GetInput(1) );
    if( input != ITK_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");
      }
    else
      {
      Superclass::GenerateData();
      }
    }

private:
  ITK_DISALLOW_COPY_AND_ASSIGN(DivideImageFilter);

};
} // end namespace itk

#endif