itkBSplineInterpolationWeightFunction.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
 *
 *         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 itkBSplineInterpolationWeightFunction_h
#define itkBSplineInterpolationWeightFunction_h
 
#include "itkFunctionBase.h"
#include "itkContinuousIndex.h"
#include "itkBSplineKernelFunction.h"
#include "itkArray.h"
#include "itkArray2D.h"
 
namespace itk
{
template <typename TCoordRep = float, unsigned int VSpaceDimension = 2, unsigned int VSplineOrder = 3>
class ITK_TEMPLATE_EXPORT BSplineInterpolationWeightFunction
  : public FunctionBase<ContinuousIndex<TCoordRep, VSpaceDimension>, Array<double>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(BSplineInterpolationWeightFunction);
 
  using Self = BSplineInterpolationWeightFunction;
  using Superclass = FunctionBase<ContinuousIndex<TCoordRep, VSpaceDimension>, Array<double>>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkNewMacro(Self);
 
  itkTypeMacro(BSplineInterpolationWeightFunction, FunctionBase);
 
  static constexpr unsigned int SpaceDimension = VSpaceDimension;
 
  static constexpr unsigned int SplineOrder = VSplineOrder;
 
  using WeightsType = Array<double>;
 
  using IndexType = Index<VSpaceDimension>;
  using SizeType = Size<VSpaceDimension>;
 
  using ContinuousIndexType = ContinuousIndex<TCoordRep, VSpaceDimension>;
 
  WeightsType
  Evaluate(const ContinuousIndexType & index) const override;
 
  virtual void
  Evaluate(const ContinuousIndexType & index, WeightsType & weights, IndexType & startIndex) const;
 
  itkGetConstMacro(SupportSize, SizeType);
 
  itkGetConstMacro(NumberOfWeights, unsigned int);
 
protected:
  BSplineInterpolationWeightFunction();
  ~BSplineInterpolationWeightFunction() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
private:
  unsigned int m_NumberOfWeights;
 
  SizeType m_SupportSize;
 
  using TableType = Array2D<unsigned int>;
 
  TableType m_OffsetToIndexTable;
 
  using KernelType = BSplineKernelFunction<Self::SplineOrder>;
 
  typename KernelType::Pointer m_Kernel;
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkBSplineInterpolationWeightFunction.hxx"
#endif
 
#endif