/*
 * Software License Agreement (BSD License)
 *
 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2011 Willow Garage, Inc.
 *  Copyright (c) 2012-, Open Perception, Inc.
 *
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 *     notice, this list of conditions and the following disclaimer.
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 *     with the distribution.
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 *     from this software without specific prior written permission.
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 */

#pragma once
 
#include <pcl/pcl_config.h>
#ifdef HAVE_OPENNI2

#include <vector>
#include <limits>

namespace openni_wrapper
{
  /** \brief This class provides conversion of the openni 11-bit shift data to depth;
    */
  class PCL_EXPORTS ShiftToDepthConverter
  {
    public:
      /** \brief Constructor. */
      ShiftToDepthConverter () : init_(false) {}

      /** \brief This method generates a look-up table to convert openni shift values to depth
        */
      void
      generateLookupTable ()
      {
        // lookup of 11 bit shift values
        constexpr std::size_t table_size = 1<<10;

        lookupTable_.clear();
        lookupTable_.resize(table_size);

        // constants taken from openni driver
        constexpr std::int16_t nConstShift = 800;
        constexpr double nParamCoeff = 4.000000;
        constexpr double dPlanePixelSize = 0.104200;
        constexpr double nShiftScale = 10.000000;
        constexpr double dPlaneDsr = 120.000000;
        constexpr double dPlaneDcl = 7.500000;

        for (std::size_t i=0; i<table_size; ++i)
        {
          // shift to depth calculation from opnni
          double dFixedRefX = (static_cast<double>(i - nConstShift) / nParamCoeff)-0.375;
          double dMetric = dFixedRefX * dPlanePixelSize;
          lookupTable_[i] = static_cast<float>((nShiftScale * ((dMetric * dPlaneDsr / (dPlaneDcl - dMetric)) + dPlaneDsr) ) / 1000.0f);
        }

        init_ = true;
      }

      /** \brief Generate a look-up table for converting openni shift values to depth
         */
      inline float
      shiftToDepth (std::uint16_t shift_val)
      {
        assert (init_);

        static const float bad_point = std::numeric_limits<float>::quiet_NaN ();

        float ret = bad_point;

        // lookup depth value in shift lookup table
        if (shift_val<lookupTable_.size())
          ret = lookupTable_[shift_val];

        return ret;
      }

      inline bool isInitialized() const
      {
        return init_;
      }

    protected:
      std::vector<float> lookupTable_;
      bool init_;
  } ;
}
#endif
