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:
  typedef GPUGradientNDAnisotropicDiffusionFunction       Self;
  typedef GPUScalarAnisotropicDiffusionFunction< TImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(GPUGradientNDAnisotropicDiffusionFunction,
               GPUScalarAnisotropicDiffusionFunction);

  typedef typename Superclass::ImageType        ImageType;
  typedef typename Superclass::PixelType        PixelType;
  typedef typename Superclass::PixelRealType    PixelRealType;
  typedef typename Superclass::TimeStepType     TimeStepType;
  typedef typename Superclass::RadiusType       RadiusType;
  typedef typename Superclass::NeighborhoodType NeighborhoodType;
  typedef typename Superclass::FloatOffsetType  FloatOffsetType;

  typedef SizeValueType NeighborhoodSizeValueType;

  itkStaticConstMacro(ImageDimension, unsigned int, Superclass::ImageDimension);

  itkGetOpenCLSourceFromKernelMacro(GPUGradientNDAnisotropicDiffusionFunctionKernel);

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

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

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

  NeighborhoodInnerProduct< ImageType > m_InnerProduct;

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

  DerivativeOperator< PixelType, itkGetStaticConstMacro(ImageDimension) > dx_op;

  PixelType m_K;

  NeighborhoodSizeValueType m_Center;
  NeighborhoodSizeValueType m_Stride[ImageDimension];

  static double m_MIN_NORM;

private:
  ITK_DISALLOW_COPY_AND_ASSIGN(GPUGradientNDAnisotropicDiffusionFunction);
};
} // end namespace itk

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

#endif