itkCurvatureFlowFunction.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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 itkCurvatureFlowFunction_h
#define itkCurvatureFlowFunction_h
 
#include "itkFiniteDifferenceFunction.h"
#include "itkMacro.h"
 
namespace itk
{
template <typename TImage>
class ITK_TEMPLATE_EXPORT CurvatureFlowFunction : public FiniteDifferenceFunction<TImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(CurvatureFlowFunction);
 
  using Self = CurvatureFlowFunction;
  using Superclass = FiniteDifferenceFunction<TImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkNewMacro(Self);
 
  itkTypeMacro(CurvatureFlowFunction, FiniteDifferenceFunction);
 
  using typename Superclass::ImageType;
  using typename Superclass::PixelType;
  using typename Superclass::RadiusType;
  using ScalarValueType = PixelType;
  using typename Superclass::PixelRealType;
  using typename Superclass::NeighborhoodType;
  using typename Superclass::NeighborhoodScalesType;
  using typename Superclass::FloatOffsetType;
  using typename Superclass::TimeStepType;
 
  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
 
  TimeStepType
  ComputeGlobalTimeStep(void * GlobalData) const override;
 
  void *
  GetGlobalDataPointer() const override
  {
    auto * ans = new GlobalDataStruct();
 
    ans->m_MaxChange = NumericTraits<ScalarValueType>::ZeroValue();
    return ans;
  }
 
  void
  ReleaseGlobalDataPointer(void * GlobalData) const override
  {
    delete (GlobalDataStruct *)GlobalData;
  }
 
  void
  SetTimeStep(const TimeStepType & t)
  {
    m_TimeStep = t;
  }
 
  const TimeStepType &
  GetTimeStep() const
  {
    return m_TimeStep;
  }
 
  PixelType
  ComputeUpdate(const NeighborhoodType & it,
                void *                   globalData,
                const FloatOffsetType &  offset = FloatOffsetType(0.0)) override;
 
protected:
 
  struct GlobalDataStruct
  {
    GlobalDataStruct() { m_MaxChange = NumericTraits<ScalarValueType>::ZeroValue(); }
 
    ~GlobalDataStruct() = default;
 
    ScalarValueType m_MaxChange;
  };
 
  CurvatureFlowFunction();
  ~CurvatureFlowFunction() override = default;
 
private:
  TimeStepType m_TimeStep{};
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkCurvatureFlowFunction.hxx"
#endif
 
#endif