ProjectorByBinPair.h

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//
//
/*
    Copyright (C) 2000- 2007, Hammersmith Imanet Ltd
    This file is part of STIR.

    SPDX-License-Identifier: Apache-2.0

    See STIR/LICENSE.txt for details
*/
#ifndef __stir_recon_buildblock_ProjectorByBinPair_h_
#define __stir_recon_buildblock_ProjectorByBinPair_h_

#include "stir/RegisteredObject.h"
#include "stir/recon_buildblock/ForwardProjectorByBin.h"
#include "stir/recon_buildblock/BackProjectorByBin.h"
#include "stir/ParsingObject.h"
#include "stir/shared_ptr.h"

START_NAMESPACE_STIR

template <int num_dimensions, class elemT>
class DiscretisedDensity;
class ProjDataInfo;

class ProjectorByBinPair : public RegisteredObject<ProjectorByBinPair>
{
public:
  ProjectorByBinPair();

  ~ProjectorByBinPair() override {}


  virtual Succeeded set_up(const shared_ptr<const ProjDataInfo>&,
                           const shared_ptr<const DiscretisedDensity<3, float>>& // TODO should be Info only
  );

  // ForwardProjectorByBin const *
  const shared_ptr<ForwardProjectorByBin> get_forward_projector_sptr() const;

  // BackProjectorByBin const *
  const shared_ptr<BackProjectorByBin> get_back_projector_sptr() const;


  const DataSymmetriesForViewSegmentNumbers* get_symmetries_used() const
  {
    return get_back_projector_sptr()->get_symmetries_used();
  }

protected:
  shared_ptr<ForwardProjectorByBin> forward_projector_sptr;
  shared_ptr<BackProjectorByBin> back_projector_sptr;


  virtual void check(const ProjDataInfo& proj_data_info, const DiscretisedDensity<3, float>& density_info) const;
  bool _already_set_up;

private:
  shared_ptr<const ProjDataInfo> _proj_data_info_sptr;

  shared_ptr<const DiscretisedDensity<3, float>> _density_info_sptr;
};

END_NAMESPACE_STIR

#endif // __stir_recon_buildblock_ProjectorByBinPair_h_