itkFastMarchingUpwindGradientImageFilter.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 itkFastMarchingUpwindGradientImageFilter_h
#define itkFastMarchingUpwindGradientImageFilter_h
 
#include "itkFastMarchingImageFilter.h"
#include "itkImage.h"
 
namespace itk
{

class FastMarchingUpwindGradientImageFilterEnums
{
public:
  enum class TargetCondition : int
  {
    NoTargets,
    OneTarget,
    SomeTargets,
    AllTargets
  };
};

extern ITKFastMarching_EXPORT std::ostream &
operator<<(std::ostream & out, const FastMarchingUpwindGradientImageFilterEnums::TargetCondition value);
 

template <typename TLevelSet, typename TSpeedImage = Image<float, TLevelSet::ImageDimension>>
class ITK_TEMPLATE_EXPORT FastMarchingUpwindGradientImageFilter : public FastMarchingImageFilter<TLevelSet, TSpeedImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(FastMarchingUpwindGradientImageFilter);

  using Self = FastMarchingUpwindGradientImageFilter;
  using Superclass = FastMarchingImageFilter<TLevelSet, TSpeedImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(FastMarchingUpwindGradientImageFilter);

  using typename Superclass::LevelSetType;
  using typename Superclass::SpeedImageType;
  using typename Superclass::LevelSetImageType;
  using typename Superclass::LevelSetPointer;
  using typename Superclass::SpeedImageConstPointer;
  using typename Superclass::LabelImageType;
  using typename Superclass::PixelType;
  using typename Superclass::AxisNodeType;
  using typename Superclass::NodeType;
  using typename Superclass::NodeContainer;
  using typename Superclass::NodeContainerPointer;
 
  using typename Superclass::IndexType;
  using typename Superclass::OutputSpacingType;
  using typename Superclass::LevelSetIndexType;
 
  using PointType = typename Superclass::OutputPointType;

  static constexpr unsigned int SetDimension = Superclass::SetDimension;
 
  using TargetConditionEnum = FastMarchingUpwindGradientImageFilterEnums::TargetCondition;
#if !defined(ITK_LEGACY_REMOVE)
  // We need to expose the enum values at the class level
  // for backwards compatibility
  static constexpr TargetConditionEnum NoTargets = TargetConditionEnum::NoTargets;
  static constexpr TargetConditionEnum OneTarget = TargetConditionEnum::OneTarget;
  static constexpr TargetConditionEnum SomeTargets = TargetConditionEnum::SomeTargets;
  static constexpr TargetConditionEnum AllTargets = TargetConditionEnum::AllTargets;
#endif

  void
  SetTargetPoints(NodeContainer * points)
  {
    m_TargetPoints = points;
    this->Modified();
  }

  NodeContainerPointer
  GetTargetPoints()
  {
    return m_TargetPoints;
  }

  NodeContainerPointer
  GetReachedTargetPoints()
  {
    return m_ReachedTargetPoints;
  }

  using GradientPixelType = CovariantVector<PixelType, Self::SetDimension>;

  using GradientImageType = Image<GradientPixelType, Self::SetDimension>;

  using GradientImagePointer = typename GradientImageType::Pointer;

  GradientImagePointer
  GetGradientImage() const
  {
    return m_GradientImage;
  }

  itkSetMacro(GenerateGradientImage, bool);

  itkGetConstReferenceMacro(GenerateGradientImage, bool);
  itkBooleanMacro(GenerateGradientImage);
  itkSetMacro(TargetOffset, double);

  itkGetConstReferenceMacro(TargetOffset, double);

  itkSetMacro(TargetReachedMode, TargetConditionEnum);
  itkGetConstReferenceMacro(TargetReachedMode, TargetConditionEnum);
  void
  SetTargetReachedModeToNoTargets()
  {
    this->SetTargetReachedMode(TargetConditionEnum::NoTargets);
    m_NumberOfTargets = 0;
  }
  void
  SetTargetReachedModeToOneTarget()
  {
    this->SetTargetReachedMode(TargetConditionEnum::OneTarget);
    m_NumberOfTargets = 1;
  }
  void
  SetTargetReachedModeToSomeTargets(SizeValueType numberOfTargets)
  {
    this->SetTargetReachedMode(TargetConditionEnum::SomeTargets);
    m_NumberOfTargets = numberOfTargets;
  }

  void
  SetTargetReachedModeToAllTargets()
  {
    this->SetTargetReachedMode(TargetConditionEnum::AllTargets);
    // m_NumberOfTargets is not used for this case
  }

  itkGetConstReferenceMacro(NumberOfTargets, SizeValueType);

  itkGetConstReferenceMacro(TargetValue, double);
 
  itkConceptMacro(LevelSetDoubleDivisionOperatorsCheck,
                  (Concept::DivisionOperators<typename TLevelSet::PixelType, double>));
  itkConceptMacro(LevelSetDoubleDivisionAndAssignOperatorsCheck,
                  (Concept::DivisionAndAssignOperators<typename TLevelSet::PixelType, double>));
 
protected:
  FastMarchingUpwindGradientImageFilter();
  ~FastMarchingUpwindGradientImageFilter() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  VerifyPreconditions() const override;
 
  void
  Initialize(LevelSetImageType *) override;
 
  void
  GenerateData() override;
 
  void
  UpdateNeighbors(const IndexType & index, const SpeedImageType *, LevelSetImageType *) override;
 
  virtual void
  ComputeGradient(const IndexType &         index,
                  const LevelSetImageType * output,
                  const LabelImageType *    labelImage,
                  GradientImageType *       gradientImage);

  bool
  IsTargetPointsExistenceConditionSatisfied() const
  {
    if (!m_TargetPoints || m_TargetPoints->Size() == 0)
    {
      return false;
    }
 
    return true;
  }

  void
  VerifyTargetReachedModeConditions(unsigned int targetModeMinPoints = 1) const
  {
    const bool targetPointsExist = this->IsTargetPointsExistenceConditionSatisfied();
 
    if (!targetPointsExist)
    {
      itkExceptionMacro("No target point set. Cannot set the target reached mode.");
    }
    else
    {
      const SizeValueType availableNumberOfTargets = m_TargetPoints->Size();
      if (targetModeMinPoints > availableNumberOfTargets)
      {
        itkExceptionMacro("Not enough target points: Available: " << availableNumberOfTargets
                                                                  << "; Requested: " << targetModeMinPoints);
      }
    }
  }
 
 
private:
  NodeContainerPointer m_TargetPoints{};
  NodeContainerPointer m_ReachedTargetPoints{};
 
  GradientImagePointer m_GradientImage{};
 
  bool m_GenerateGradientImage{};
 
  double m_TargetOffset{};
 
  TargetConditionEnum m_TargetReachedMode{};
 
  double m_TargetValue{};
 
  SizeValueType m_NumberOfTargets{};
};
} // namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkFastMarchingUpwindGradientImageFilter.hxx"
#endif
 
#endif