itkSqrtImageAdaptor.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSqrtImageAdaptor.h,v $
  Language:  C++
  Date:      $Date: 2009-09-19 19:56:20 $
  Version:   $Revision: 1.14 $

  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 __itkSqrtImageAdaptor_h
#define __itkSqrtImageAdaptor_h

#include <itkImageAdaptor.h>
#include "vnl/vnl_math.h"

namespace itk
{
 
namespace Accessor {
template <class TInternalType, class TExternalType >
class ITK_EXPORT SqrtPixelAccessor  
{
public:
  typedef TExternalType ExternalType;

  typedef TInternalType InternalType;

  static inline void Set(TInternalType & output, const TExternalType & input) 
    {output = (TInternalType)vcl_sqrt((double)input);}

  static inline TExternalType Get( const TInternalType & input ) 
    {return (TExternalType)vcl_sqrt((double)input);}
};

} // end namespace Accessor
 
template <class TImage, class TOutputPixelType>
class ITK_EXPORT SqrtImageAdaptor : public
      ImageAdaptor<TImage, Accessor::SqrtPixelAccessor<
                                      typename TImage::PixelType,
                                      TOutputPixelType>   >
{
public:
  typedef SqrtImageAdaptor                                 Self;
  typedef ImageAdaptor<TImage,Accessor::SqrtPixelAccessor<
                                       typename TImage::PixelType,
                                       TOutputPixelType> > Superclass;
  typedef SmartPointer<Self>                               Pointer;
  typedef SmartPointer<const Self>                         ConstPointer;

  itkNewMacro(Self);  

  itkTypeMacro( SqrtImageAdaptor, ImageAdaptor );

protected:
  SqrtImageAdaptor() {}
  virtual ~SqrtImageAdaptor() {}
  
private:
  SqrtImageAdaptor(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

} // end namespace itk

#endif