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 #ifndef RecoLocalTracker_SiPixelClusterizer_PixelThresholdClusterizer_H
 #define RecoLocalTracker_SiPixelClusterizer_PixelThresholdClusterizer_H
 
 //-----------------------------------------------------------------------
 //! \class PixelThresholdClusterizer
 //! \brief An explicit threshold-based clustering algorithm.
 //!
 //! A threshold-based clustering algorithm which clusters SiPixelDigis
 //! into SiPixelClusters for each DetUnit.  The algorithm is straightforward
 //! and purely topological: the clustering process starts with seed pixels
 //! and continues by adding adjacent pixels above the pixel threshold.
 //! Once the cluster is made, it has to be above the cluster threshold as
 //! well.
 //!
 //! The clusterization is performed on a matrix with size
 //! equal to the size of the pixel detector, each cell containing
 //! the ADC count of the corresponding pixel.
 //! The matrix is reset after each clusterization.
 //!
 //! The search starts from seed pixels, i.e. pixels with sufficiently
 //! large amplitudes, found at the time of filling of the matrix
 //! and stored in a
 //!
 //! At this point the noise and dead channels are ignored, but soon they
 //! won't be.
 //!
 //! SiPixelCluster contains a barrycenter, but it should be noted that that
 //! information is largely useless.  One must use a PositionEstimator
 //! class to compute the RecHit position and its error for every given
 //! cluster.
 //!
 //! \author Largely copied from NewPixelClusterizer in ORCA written by
 //!     Danek Kotlinski (PSI).   Ported to CMSSW by Petar Maksimovic (JHU).
 //!     DetSetVector data container implemented by V.Chiochia (Uni Zurich)
 //!
 //! Sets the PixelArrayBuffer dimensions and pixel thresholds.
 //! Makes clusters and stores them in theCache if the option
 //! useCache has been set.
 //-----------------------------------------------------------------------
 
 // Base class, defines SiPixelDigi and SiPixelCluster.  The latter includes
 // Pixel, PixelPos and Shift as inner classes.
 //
 #include "DataFormats/Common/interface/DetSetVector.h"
 #include "PixelClusterizerBase.h"
 
 // The private pixel buffer
 #include "SiPixelArrayBuffer.h"
 
 // Parameter Set:
 #include "FWCore/ParameterSet/interface/ParameterSet.h"
 
 #include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
 
 #include <vector>
 
 class dso_hidden PixelThresholdClusterizer : public PixelClusterizerBase {
 public:
   PixelThresholdClusterizer(edm::ParameterSet const& conf);
   ~PixelThresholdClusterizer() override;
 
   // Full I/O in DetSet
   void clusterizeDetUnit(const edm::DetSet<PixelDigi>& input,
                          const PixelGeomDetUnit* pixDet,
                          const TrackerTopology* tTopo,
                          const std::vector<short>& badChannels,
                          edmNew::DetSetVector<SiPixelCluster>::FastFiller& output) override {
     clusterizeDetUnitT(input, pixDet, tTopo, badChannels, output);
   }
   void clusterizeDetUnit(const edmNew::DetSet<SiPixelCluster>& input,
                          const PixelGeomDetUnit* pixDet,
                          const TrackerTopology* tTopo,
                          const std::vector<short>& badChannels,
                          edmNew::DetSetVector<SiPixelCluster>::FastFiller& output) override {
     clusterizeDetUnitT(input, pixDet, tTopo, badChannels, output);
   }
 
   static void fillPSetDescription(edm::ParameterSetDescription& desc);
 
 protected:
   template <typename T>
   void clusterizeDetUnitT(const T& input,
                           const PixelGeomDetUnit* pixDet,
                           const TrackerTopology* tTopo,
                           const std::vector<short>& badChannels,
                           edmNew::DetSetVector<SiPixelCluster>::FastFiller& output);
 
   //! Data storage
   SiPixelArrayBuffer theBuffer;                    // internal nrow * ncol matrix
   std::vector<SiPixelCluster::PixelPos> theSeeds;  // cached seed pixels
   std::vector<SiPixelCluster> theClusters;         // resulting clusters
 
   std::vector<bool> theFakePixels;  // fake pixels introduced to guide clustering
 
   std::vector<uint8_t> thePixelOccurrence;  // the number of times each pixel occurs (for tracking duplicate pixels)
 
   //! Clustering-related quantities:
   float thePixelThresholdInNoiseUnits;    // Pixel threshold in units of noise
   float theSeedThresholdInNoiseUnits;     // Pixel cluster seed in units of noise
   float theClusterThresholdInNoiseUnits;  // Cluster threshold in units of noise
 
   const int thePixelThreshold;       // Pixel threshold in electrons
   const int theSeedThreshold;        // Seed threshold in electrons
   const int theClusterThreshold;     // Cluster threshold in electrons
   const int theClusterThreshold_L1;  // Cluster threshold in electrons for Layer 1
   const int theConversionFactor;     // adc to electron conversion factor
   const int theConversionFactor_L1;  // adc to electron conversion factor for Layer 1
   const int theOffset;               // adc to electron conversion offset
   const int theOffset_L1;            // adc to electron conversion offset for Layer 1
 
   const double theElectronPerADCGain;  //  ADC to electrons conversion
 
   const bool doPhase2Calibration;  // The ADC --> electrons calibration is for phase-2 tracker
 
   const bool dropDuplicates;  // Enabling dropping duplicate pixels
 
   const int thePhase2ReadoutMode;      // Readout mode of the phase-2 IT digitizer
   const double thePhase2DigiBaseline;  // Threshold above which digis are measured in the phase-2 IT
   const int thePhase2KinkADC;          // ADC count at which the kink in the dual slop kicks in
 
   //! Geometry-related information
   int theNumOfRows;
   int theNumOfCols;
   uint32_t theDetid;
   int theLayer;
   const bool doMissCalibrate;  // Use calibration or not
   const bool doSplitClusters;
   //! Private helper methods:
   bool setup(const PixelGeomDetUnit* pixDet);
   void copy_to_buffer(DigiIterator begin, DigiIterator end);
   void copy_to_buffer(ClusterIterator begin, ClusterIterator end);
   void clear_buffer(DigiIterator begin, DigiIterator end);
   void clear_buffer(ClusterIterator begin, ClusterIterator end);
   SiPixelCluster make_cluster(const SiPixelCluster::PixelPos& pix,
                               edmNew::DetSetVector<SiPixelCluster>::FastFiller& output);
   // Calibrate the ADC charge to electrons
   int calibrate(int adc, int col, int row);
 };
 
 #endif

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