itkGPUAnisotropicDiffusionFunction.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
 *
 *         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 itkGPUAnisotropicDiffusionFunction_h
#define itkGPUAnisotropicDiffusionFunction_h

#include "itkGPUFiniteDifferenceFunction.h"

namespace itk
{
template< typename TImage >
class GPUAnisotropicDiffusionFunction :
  public GPUFiniteDifferenceFunction< TImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(GPUAnisotropicDiffusionFunction);

  using Self = GPUAnisotropicDiffusionFunction;
  using Superclass = GPUFiniteDifferenceFunction< TImage >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(GPUAnisotropicDiffusionFunction, GPUFiniteDifferenceFunction);

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

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  virtual void GPUCalculateAverageGradientMagnitudeSquared(ImageType *) = 0;

  void SetTimeStep(const TimeStepType & t)
  {
    m_TimeStep = t;
  }

  const TimeStepType & GetTimeStep() const
  {
    return m_TimeStep;
  }

  void SetConductanceParameter(const double & c)
  {
    m_ConductanceParameter = c;
  }

  const double & GetConductanceParameter() const
  {
    return m_ConductanceParameter;
  }

  const double & GetAverageGradientMagnitudeSquared() const
  {
    return m_AverageGradientMagnitudeSquared;
  }

  void SetAverageGradientMagnitudeSquared(const double & c)
  {
    m_AverageGradientMagnitudeSquared = c;
  }

  TimeStepType ComputeGlobalTimeStep( void *itkNotUsed(GlobalData) ) const override
  {
    return this->GetTimeStep();
  }

  void * GetGlobalDataPointer() const override
  {
    return nullptr;
  }

  void ReleaseGlobalDataPointer( void *itkNotUsed(GlobalData) ) const override
  {
    /* do nothing */
  }

protected:
  GPUAnisotropicDiffusionFunction()
  {
    m_AverageGradientMagnitudeSquared = 0.0;
    m_ConductanceParameter     = 1.0;     // default value
    m_TimeStep                 = 0.125f;  // default value
  }

  ~GPUAnisotropicDiffusionFunction() override {}

  void PrintSelf(std::ostream & os, Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
    os << indent << "TimeStep: " << m_TimeStep << std::endl;
    os << indent << "ConductanceParameter: " << m_ConductanceParameter
       << std::endl;
  }

  // GPU buffer for Computing Average Squared Gradient Magnitude
  typename GPUDataManager::Pointer   m_AnisotropicDiffusionFunctionGPUBuffer;
  typename GPUKernelManager::Pointer m_AnisotropicDiffusionFunctionGPUKernelManager;

  // GPU Kernel Handles
  int m_AverageGradientMagnitudeSquaredGPUKernelHandle;

private:
  double       m_AverageGradientMagnitudeSquared;
  double       m_ConductanceParameter;
  TimeStepType m_TimeStep;
};
} // end namespace itk

#endif