itkLogImageAdaptor.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 itkLogImageAdaptor_h
#define itkLogImageAdaptor_h

#include "itkImageAdaptor.h"
#include "itkMath.h"

namespace itk
{
namespace Accessor
{
template< typename TInternalType, typename TExternalType >
class LogPixelAccessor
{
public:
  using ExternalType = TExternalType;

  using InternalType = TInternalType;

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

  static inline TExternalType Get(const TInternalType & input)
  { return (TExternalType)std::log( (double)input ); }
};
} // end namespace Accessor

template< typename TImage, typename TOutputPixelType >
class LogImageAdaptor:public
  ImageAdaptor< TImage,
                Accessor::LogPixelAccessor<
                  typename TImage::PixelType,
                  TOutputPixelType >   >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(LogImageAdaptor);

  using Self = LogImageAdaptor;
  using Superclass = ImageAdaptor< TImage,
                        Accessor::LogPixelAccessor<
                          typename TImage::PixelType,
                          TOutputPixelType > >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(LogImageAdaptor, ImageAdaptor);

  itkNewMacro(Self);

protected:
  LogImageAdaptor() = default;
  ~LogImageAdaptor() override = default;
};
} // end namespace itk

#endif