itkGPUGradientNDAnisotropicDiffusionFunction.h

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 *  Copyright Insight Software Consortium
 *
 *  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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 *  distributed under the License is distributed on an "AS IS" BASIS,
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 *  See the License for the specific language governing permissions and
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#ifndef itkGPUGradientNDAnisotropicDiffusionFunction_h
#define itkGPUGradientNDAnisotropicDiffusionFunction_h

#include "itkGPUScalarAnisotropicDiffusionFunction.h"
#include "itkNeighborhoodAlgorithm.h"
#include "itkNeighborhoodInnerProduct.h"
#include "itkDerivativeOperator.h"

namespace itk
{
itkGPUKernelClassMacro(GPUGradientNDAnisotropicDiffusionFunctionKernel);

template< typename TImage >
class ITK_TEMPLATE_EXPORT GPUGradientNDAnisotropicDiffusionFunction :
  public GPUScalarAnisotropicDiffusionFunction< TImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(GPUGradientNDAnisotropicDiffusionFunction);

  using Self = GPUGradientNDAnisotropicDiffusionFunction;
  using Superclass = GPUScalarAnisotropicDiffusionFunction< TImage >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(GPUGradientNDAnisotropicDiffusionFunction,
               GPUScalarAnisotropicDiffusionFunction);

  using ImageType = typename Superclass::ImageType;
  using PixelType = typename Superclass::PixelType;
  using PixelRealType = typename Superclass::PixelRealType;
  using TimeStepType = typename Superclass::TimeStepType;
  using RadiusType = typename Superclass::RadiusType;
  using NeighborhoodType = typename Superclass::NeighborhoodType;
  using FloatOffsetType = typename Superclass::FloatOffsetType;

  using NeighborhoodSizeValueType = SizeValueType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  itkGetOpenCLSourceFromKernelMacro(GPUGradientNDAnisotropicDiffusionFunctionKernel);

  virtual void GPUComputeUpdate( const typename TImage::Pointer output, typename TImage::Pointer buffer,
                                 void *globalData ) override;

  void InitializeIteration() override
  {
    m_K = static_cast< PixelType >( this->GetAverageGradientMagnitudeSquared()
                                    * this->GetConductanceParameter() * this->GetConductanceParameter() * -2.0f );
  }

protected:
  GPUGradientNDAnisotropicDiffusionFunction();
  ~GPUGradientNDAnisotropicDiffusionFunction() override {}

  NeighborhoodInnerProduct< ImageType > m_InnerProduct;

  std::slice x_slice[ImageDimension];
  std::slice xa_slice[ImageDimension][ImageDimension];
  std::slice xd_slice[ImageDimension][ImageDimension];

  DerivativeOperator< PixelType, Self::ImageDimension > m_DerivativeOperator;

  PixelType m_K;

  NeighborhoodSizeValueType m_Center;
  NeighborhoodSizeValueType m_Stride[ImageDimension];

  static double m_MIN_NORM;
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkGPUGradientNDAnisotropicDiffusionFunction.hxx"
#endif

#endif