otbShiftScaleImageAdaptor.h

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/*
 * Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * 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
 *
 * 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 otbShiftScaleImageAdaptor_h
#define otbShiftScaleImageAdaptor_h
 
#include "vnl/vnl_math.h"
#include "itkImageAdaptor.h"
 
namespace otb
{
 
namespace Accessor
{
template <class TPixelType, class TExternalType>
class ITK_EXPORT ShiftScalePixelAccessor
{
public:
  typedef TExternalType ExternalType;
 
  typedef typename itk::NumericTraits<TPixelType>::RealType InternalType;
 
  InternalType GetShift() const
  {
    return m_Shift;
  }
  void SetShift(InternalType value)
  {
    m_Shift = value;
  }
 
  InternalType GetScale() const
  {
    return m_Scale;
  }
  void SetScale(InternalType value)
  {
    m_Scale = value;
  }
 
  inline void Set(InternalType& output, const ExternalType& input)
  {
    output = static_cast<InternalType>(m_Scale * (static_cast<InternalType>(input) + m_Shift));
  }
 
  inline const ExternalType Get(const InternalType& input) const
  {
    return static_cast<ExternalType>(m_Scale * (static_cast<InternalType>(input) + m_Shift));
  }
 
private:
  InternalType m_Shift;
  InternalType m_Scale;
};
 
} // end namespace Accessor
 
template <class TImage, class TOutputPixelType>
class ITK_EXPORT ShiftScaleImageAdaptor : public itk::ImageAdaptor<TImage, Accessor::ShiftScalePixelAccessor<typename TImage::PixelType, TOutputPixelType>>
{
public:
  typedef ShiftScaleImageAdaptor Self;
  typedef itk::ImageAdaptor<TImage, Accessor::ShiftScalePixelAccessor<typename TImage::PixelType, TOutputPixelType>> Superclass;
  typedef itk::SmartPointer<Self>        Pointer;
  typedef itk::SmartPointer<const Self>  ConstPointer;
  typedef typename TImage::PixelType     InternalType;
  typedef typename Superclass::IndexType IndexType;
  typedef typename Accessor::ShiftScalePixelAccessor<typename TImage::PixelType, TOutputPixelType> AccessorType;
  typedef typename AccessorType::ExternalType PixelType;
 
  itkNewMacro(Self);
 
  itkTypeMacro(ShiftScaleImageAdaptor, ImageAdaptor);
 
  typename TImage::PixelType GetShift() const
  {
    itkDebugMacro("returning "
                  << " m_Shift of " << this->GetPixelAccessor().GetShift());
    return this->GetPixelAccessor().GetShift();
  }
 
  virtual void SetShift(typename TImage::PixelType value)
  {
    itkDebugMacro("setting m_Shift to " << value);
    if (this->GetPixelAccessor().GetShift() != value)
    {
      this->GetPixelAccessor().SetShift(value);
      this->Modified();
    }
  }
 
  typename TImage::PixelType GetScale() const
  {
    itkDebugMacro("returning "
                  << " m_Scale of " << this->GetPixelAccessor().GetScale());
    return this->GetPixelAccessor().GetScale();
  }
 
  virtual void SetScale(typename TImage::PixelType value)
  {
    itkDebugMacro("setting m_Scale to " << value);
    if (this->GetPixelAccessor().GetScale() != value)
    {
      this->GetPixelAccessor().SetScale(value);
      this->Modified();
    }
  }
 
protected:
  ShiftScaleImageAdaptor()
  {
  }
  ~ShiftScaleImageAdaptor() override
  {
  }
 
private:
  ShiftScaleImageAdaptor(const Self&) = delete;
  void operator=(const Self&) = delete;
};
 
} // end namespace otb
 
#endif