itkRecursiveBSplineInterpolationWeightFunction.h

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 *  Copyright UMC Utrecht and contributors
 *
 *  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
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 *        http://www.apache.org/licenses/LICENSE-2.0.txt
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 *  See the License for the specific language governing permissions and
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#ifndef itkRecursiveBSplineInterpolationWeightFunction_h
#define itkRecursiveBSplineInterpolationWeightFunction_h
 
#include "itkBSplineInterpolationWeightFunction.h"
 
#include "itkBSplineKernelFunction2.h"
#include "itkBSplineDerivativeKernelFunction2.h"
#include "itkBSplineSecondOrderDerivativeKernelFunction2.h"
#include "itkMath.h"
 
namespace itk
{
template <typename TCoordRep = float, unsigned int VSpaceDimension = 2, unsigned int VSplineOrder = 3>
class ITK_TEMPLATE_EXPORT RecursiveBSplineInterpolationWeightFunction
  : public BSplineInterpolationWeightFunction<TCoordRep, VSpaceDimension, VSplineOrder>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(RecursiveBSplineInterpolationWeightFunction);

  using Self = RecursiveBSplineInterpolationWeightFunction;
  using Superclass = BSplineInterpolationWeightFunction<TCoordRep, VSpaceDimension, VSplineOrder>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkTypeMacro(RecursiveBSplineInterpolationWeightFunction, FunctionBase);

  itkStaticConstMacro(SpaceDimension, unsigned int, VSpaceDimension);

  itkStaticConstMacro(SplineOrder, unsigned int, VSplineOrder);

  using typename Superclass::WeightsType;
  using typename Superclass::IndexType;
  using typename Superclass::SizeType;
  using typename Superclass::ContinuousIndexType;

  static constexpr unsigned NumberOfIndices = Math::UnsignedPower(VSplineOrder + 1, VSpaceDimension);

  itkGetConstMacro(NumberOfIndices, unsigned int);
 
  WeightsType
  Evaluate(const ContinuousIndexType & index, IndexType & startIndex) const;
 
  WeightsType
  EvaluateDerivative(const ContinuousIndexType & index, const IndexType & startIndex) const;
 
  WeightsType
  EvaluateSecondOrderDerivative(const ContinuousIndexType & index, const IndexType & startIndex) const;
 
protected:
  RecursiveBSplineInterpolationWeightFunction() = default;
  ~RecursiveBSplineInterpolationWeightFunction() override = default;
  using Superclass::PrintSelf;
 
private:
  WeightsType
  Evaluate(const ContinuousIndexType & index) const override;

  void
  Evaluate(const ContinuousIndexType & index, WeightsType & weights, IndexType & startIndex) const override;

  unsigned int m_NumberOfIndices{};

  using KernelType = BSplineKernelFunction2<VSplineOrder>;
  using DerivativeKernelType = BSplineDerivativeKernelFunction2<VSplineOrder>;
  using SecondOrderDerivativeKernelType = BSplineSecondOrderDerivativeKernelFunction2<VSplineOrder>;
};
 
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkRecursiveBSplineInterpolationWeightFunction.hxx"
#endif
 
#endif