/*=========================================================================
 *
 *  Copyright UMC Utrecht and contributors
 *
 *  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.
 *
 *=========================================================================*/
/*=========================================================================
 *
 *  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 itkGPUImageDataManager_h
#define itkGPUImageDataManager_h

#include <itkObject.h>
#include <itkTimeStamp.h>
#include <itkLightObject.h>
#include <itkObjectFactory.h>
#include "itkGPUImage.h"
#include "itkGPUDataManager.h"

namespace itk
{
/**
 * \class GPUImage Data Management
 *
 * DataManager for GPUImage. This class will take care of data synchronization
 * between CPU Image and GPU Image.
 *
 * \note This file was taken from ITK 4.1.0.
 * It was modified by Denis P. Shamonin and Marius Staring.
 * Division of Image Processing,
 * Department of Radiology, Leiden, The Netherlands.
 * Added functionality is described in the Insight Journal paper:
 * http://hdl.handle.net/10380/3393
 *
 * \ingroup ITKGPUCommon
 */
template <typename TPixel, unsigned int NDimension>
class ITK_TEMPLATE_EXPORT GPUImage;

template <typename ImageType>
class ITK_TEMPLATE_EXPORT ITKOpenCL_EXPORT GPUImageDataManager : public GPUDataManager
{
  // allow GPUKernelManager to access GPU buffer pointer
  friend class OpenCLKernelManager;
  friend class GPUImage<typename ImageType::PixelType, ImageType::ImageDimension>;

public:
  ITK_DISALLOW_COPY_AND_MOVE(GPUImageDataManager);

  using Self = GPUImageDataManager;
  using Superclass = GPUDataManager;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);
  itkOverrideGetNameOfClassMacro(GPUImageDataManager);

  void
  SetImagePointer(ImageType * img);

  /** actual GPU->CPU memory copy takes place here */
  void
  UpdateCPUBuffer() override;

  /** actual CPU->GPU memory copy takes place here */
  void
  UpdateGPUBuffer() override;

  /** Grafting GPU Image Data */
  virtual void
  Graft(const GPUImageDataManager * data);

protected:
  GPUImageDataManager() { m_Image = nullptr; }
  ~GPUImageDataManager() override = default;

private:
  WeakPointer<ImageType> m_Image; // WeakPointer has to be used here
                                  // to avoid SmartPointer loop
};

} // namespace itk

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

#endif
