/*=========================================================================
 *
 *  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 itkGPUUnaryFunctorImageFilter_h
#define itkGPUUnaryFunctorImageFilter_h

#include "itkGPUFunctorBase.h"
#include "itkGPUInPlaceImageFilter.h"
#include "itkUnaryFunctorImageFilter.h"

namespace itk
{
/** \class GPUUnaryFunctorImageFilter
 * \brief Implements pixel-wise generic operation on one image using the GPU.
 *
 * GPU version of unary functor image filter.
 * GPU Functor handles parameter setup for the GPU kernel.
 *
 * \ingroup   ITKGPUCommon
 */
template< typename TInputImage, typename TOutputImage, typename TFunction, typename TParentImageFilter =
            InPlaceImageFilter< TInputImage, TOutputImage > >
class ITK_TEMPLATE_EXPORT GPUUnaryFunctorImageFilter : public GPUInPlaceImageFilter< TInputImage, TOutputImage,
                                                                            TParentImageFilter >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(GPUUnaryFunctorImageFilter);

  /** Standard class type aliases. */
  using Self = GPUUnaryFunctorImageFilter;
  using CPUSuperclass = TParentImageFilter;
  using GPUSuperclass = GPUInPlaceImageFilter< TInputImage, TOutputImage >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Run-time type information (and related methods). */
  itkTypeMacro(GPUUnaryFunctorImageFilter, GPUInPlaceImageFilter);

  /** Some type alias. */
  using FunctorType = TFunction;

  using InputImageType = TInputImage;
  using InputImagePointer = typename    InputImageType::ConstPointer;
  using InputImageRegionType = typename    InputImageType::RegionType;
  using InputImagePixelType = typename    InputImageType::PixelType;

  using OutputImageType = TOutputImage;
  using OutputImagePointer = typename     OutputImageType::Pointer;
  using OutputImageRegionType = typename     OutputImageType::RegionType;
  using OutputImagePixelType = typename     OutputImageType::PixelType;

  FunctorType & GetFunctor() {
    return m_Functor;
  }
  const FunctorType & GetFunctor() const {
    return m_Functor;
  }

  /** Set the functor object. */
  void SetFunctor(const FunctorType & functor)
  {
    if ( m_Functor != functor )
      {
      m_Functor = functor;
      this->Modified();
      }
  }

protected:
  GPUUnaryFunctorImageFilter() {
  }
  ~GPUUnaryFunctorImageFilter() override {}

  void GenerateOutputInformation() override;

  void GPUGenerateData() override;

  /** GPU kernel handle is defined here instead of in the child class
   * because GPUGenerateData() in this base class is used. */
  int m_UnaryFunctorImageFilterGPUKernelHandle;

private:
  FunctorType m_Functor;

};

} // end of namespace itk

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

#endif
