itkConstrainedValueMultiplicationImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConstrainedValueMultiplicationImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2007-09-27 11:36:40 $
  Version:   $Revision: 1.7 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef itkConstrainedValueMultiplicationImageFilter_h
#define itkConstrainedValueMultiplicationImageFilter_h

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

namespace itk
{

namespace Functor {

template< class TInput1, class TInput2, class TOutput>
class ConstrainedValueMultiplication
{
public:
  ConstrainedValueMultiplication() {};
  ~ConstrainedValueMultiplication() {};
  bool operator!=( const ConstrainedValueMultiplication & ) const
    {
    return false;
    }
  bool operator==( const ConstrainedValueMultiplication & other ) const
    {
    return !(*this != other);
    }
  inline TOutput operator()( const TInput1 & A,
                             const TInput2 & B)
    {
    const double dA = static_cast<double>( A );
    const double dB = static_cast<double>( B );
    const double add = dA * dB;
    const double cadd1 = ( add < NumericTraits<TOutput>::max() ) ?
      add : NumericTraits<TOutput>::max();
    const double cadd2 = ( cadd1 > NumericTraits<TOutput>::NonpositiveMin() ) ?
      cadd1 : NumericTraits<TOutput>::NonpositiveMin();
    return static_cast<TOutput>( cadd2 );
    }
};
}

template <class TInputImage1, class TInputImage2, class TOutputImage>
class ConstrainedValueMultiplicationImageFilter :
    public
BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage,
                         Functor::ConstrainedValueMultiplication<
  typename TInputImage1::PixelType,
  typename TInputImage2::PixelType,
  typename TOutputImage::PixelType>   >
{
public:
  typedef ConstrainedValueMultiplicationImageFilter  Self;
  typedef BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage,
                                   Functor::ConstrainedValueMultiplication<
    typename TInputImage1::PixelType,
    typename TInputImage2::PixelType,
    typename TOutputImage::PixelType> >
                                    Superclass;
  typedef SmartPointer<Self>        Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(ConstrainedValueMultiplicationImageFilter,
               BinaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(Input1ConvertibleToDoubleCheck,
    (Concept::Convertible<typename TInputImage1::PixelType, double>));
  itkConceptMacro(Input2ConvertibleToDoubleCheck,
    (Concept::Convertible<typename TInputImage2::PixelType, double>));
  itkConceptMacro(DoubleConvertibleToOutputCastCheck,
    (Concept::Convertible<double, typename TOutputImage::PixelType>));
  itkConceptMacro(DoubleLessThanOutputCheck,
    (Concept::LessThanComparable<double, typename TOutputImage::PixelType>));
#endif

protected:
  ConstrainedValueMultiplicationImageFilter() {}
  virtual ~ConstrainedValueMultiplicationImageFilter() {}

private:
  ConstrainedValueMultiplicationImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};

} 


#endif