RectangularPixelTopology.h

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#ifndef Geometry_TrackerGeometryBuilder_RectangularPixelTopology_H
#define Geometry_TrackerGeometryBuilder_RectangularPixelTopology_H

// Modified for the large pixels. Should work for barrel and forward.
// Danek Kotlinski & Michele Pioppi, 3/06.
// The bigger pixels are on the ROC boundries.
// For columns (Y direction, longer direction):
//  the normal pixel are 150um long, big pixels are 300um long, 
//  the pixel index goes from 0 to 416 (or less for smaller modules)
//  the big pixel are in 0, 52,104,156,208,260,312,363
//                      51,103,155,207,259,311,363,415 .
// For rows (X direction, shorter direction):
//  the normal pixel are 100um wide, big pixels are 200um wide, 
//  the pixel index goes from 0 to 159 (or less for smaller modules)
//  the big pixel are in 79,80.
// The ROC has rows=80, cols=52.
// There are a lot of hardwired constants, sorry but this is a very 
// specific class. For any other sensor design it has to be rewritten.

// G. Giurgiu 11/27/06 ---------------------------------------------
// Check whether the pixel is at the edge of the module by adding the 
// following functions (ixbin and iybin are the pixel row and column 
// inside the module):
// bool isItEdgePixelInX (int ixbin) 
// bool isItEdgePixelInY (int iybin) 
// bool isItEdgePixel (int ixbin, int iybin) 
// ------------------------------------------------------------------
// Add the individual measurement to local trasformations classes 01/07 d.k.
// ------------------------------------------------------------------
// Add big pixel flags for cluster range 15/3/07 V.Chiochia

# include "Geometry/CommonTopologies/interface/PixelTopology.h"
# include "DataFormats/SiPixelDetId/interface/PixelChannelIdentifier.h"
# include "FWCore/MessageLogger/interface/MessageLogger.h"


class RectangularPixelTopology final : public PixelTopology
{
public:

  // Constructor, initilize 
  RectangularPixelTopology( int nrows, int ncols, float pitchx, float pitchy,
                bool upgradeGeometry,
                int ROWS_PER_ROC, // Num of Rows per ROC
                int COLS_PER_ROC, // Num of Cols per ROC
                int BIG_PIX_PER_ROC_X, // in x direction, rows. BIG_PIX_PER_ROC_X = 0 for SLHC
                int BIG_PIX_PER_ROC_Y, // in y direction, cols. BIG_PIX_PER_ROC_Y = 0 for SLHC
                int ROCS_X, int ROCS_Y )
    : m_pitchx( pitchx ),
      m_pitchy( pitchy ),
      m_nrows( nrows ),
      m_ncols( ncols ),
      m_ROWS_PER_ROC( ROWS_PER_ROC ),     // Num of Rows per ROC 
      m_COLS_PER_ROC( COLS_PER_ROC ),     // Num of Cols per ROC
      m_ROCS_X( ROCS_X ), // 2 for SLHC
      m_ROCS_Y( ROCS_Y ),  // 8 for SLHC
      m_upgradeGeometry( upgradeGeometry )
    {
      // Calculate the edge of the active sensor with respect to the center,
      // that is simply the half-size.       
      // Take into account large pixels
      m_xoffset = -(m_nrows + BIG_PIX_PER_ROC_X*m_nrows/ROWS_PER_ROC)/2. * 
          m_pitchx;
      m_yoffset = -(m_ncols + BIG_PIX_PER_ROC_Y*m_ncols/COLS_PER_ROC)/2. * 
          m_pitchy;

      LogDebug("RectangularPixelTopology") << "nrows " << m_nrows << ", ncols " << m_ncols << ", pitchx "
                       << m_pitchx << ", pitchy " << m_pitchy << ", xoffset "
                       << m_xoffset << ", yoffset " << m_yoffset << ", BIG_PIX_PER_ROC_X "
                       << BIG_PIX_PER_ROC_X << ", BIG_PIX_PER_ROC_Y " << BIG_PIX_PER_ROC_Y << ", ROWS_PER_ROC "
                       << ROWS_PER_ROC << ", COLS_PER_ROC " << COLS_PER_ROC << ", ROCS_X " << ROCS_X << ", ROCS_Y " << ROCS_Y
                       << "\nNROWS " << m_ROWS_PER_ROC * m_ROCS_X << ", NCOL " << m_COLS_PER_ROC * m_ROCS_Y;
    }

  // Topology interface, go from Masurement to Local corrdinates
  // pixel coordinates (mp) -> cm (LocalPoint)
  LocalPoint localPosition( const MeasurementPoint& mp ) const override;

  // Transform LocalPoint to Measurement. Call pixel().
  MeasurementPoint measurementPosition( const LocalPoint& lp ) 
      const override {
    std::pair<float,float> p = pixel( lp );
    return MeasurementPoint( p.first, p.second );
  }

  // PixelTopology interface. 
  // Transform LocalPoint in cm to measurement in pitch units.
  std::pair<float,float> pixel( const LocalPoint& p ) const override;

  // Errors
  // Error in local (cm) from the masurement errors
  LocalError localError( const MeasurementPoint&,
                 const MeasurementError& ) const override;
  // Errors in pitch units from localpoint error (in cm)
  MeasurementError measurementError( const LocalPoint&, 
                         const LocalError& ) const override;
  
  //-------------------------------------------------------------
  // Transform LocalPoint to channel. Call pixel()
  //
  int channel( const LocalPoint& lp ) const override {
    std::pair<float,float> p = pixel( lp );
    return PixelChannelIdentifier::pixelToChannel( int( p.first ), 
                           int( p.second ));
  }

  //-------------------------------------------------------------
  // Transform measurement to local coordinates individually in each dimension
  //
  float localX( const float mpX ) const override;
  float localY( const float mpY ) const override;

  //-------------------------------------------------------------
  // Return the BIG pixel information for a given pixel
  //
  bool isItBigPixelInX( const int ixbin ) const override {
    return (( m_upgradeGeometry )?(false):(( ixbin == 79 ) | ( ixbin == 80 )));
  } 

  bool isItBigPixelInY( const int iybin ) const override {
      if unlikely( m_upgradeGeometry ) return false;
      else {
    int iybin0 = iybin%52;
    return(( iybin0 == 0 ) | ( iybin0 == 51 ));
    // constexpr int bigYIndeces[]{0,51,52,103,104,155,156,207,208,259,260,311,312,363,364,415,416,511};
    // return *std::lower_bound(std::begin(bigYIndeces),std::end(bigYIndeces),iybin) == iybin;
     }
  }
  
  //-------------------------------------------------------------
  // Return BIG pixel flag in a given pixel range
  //
  bool containsBigPixelInX(int ixmin, int ixmax ) const override {
    return m_upgradeGeometry ? false :( (ixmin<=80) & (ixmax>=79) );
  }
  bool containsBigPixelInY(int iymin, int iymax ) const override {
    return  m_upgradeGeometry ? false :
      ( isItBigPixelInY( iymin ) || isItBigPixelInY( iymax ) ||  (iymin/52) != (iymax/52) )
      ;  
  }


  //-------------------------------------------------------------
  // Check whether the pixel is at the edge of the module
  //
  bool isItEdgePixelInX (int ixbin) const override {
    return ( (ixbin == 0) | (ixbin == (m_nrows-1)) );
  } 
  bool isItEdgePixelInY (int iybin) const override {
    return ( (iybin == 0) | (iybin == (m_ncols-1)) );
  } 
  bool isItEdgePixel (int ixbin, int iybin) const override {
    return ( isItEdgePixelInX( ixbin ) | isItEdgePixelInY( iybin ) );
  } 

  //------------------------------------------------------------------
  // Return pitch
  std::pair<float,float> pitch() const override {
    return std::pair<float,float>( float(m_pitchx), float(m_pitchy));
  }
  // Return number of rows
  int nrows() const override {
    return ( m_nrows );
  }
  // Return number of cols
  int ncolumns() const override {
    return ( m_ncols );
  }
  // mlw Return number of ROCS Y     
  int rocsY() const override {   
    return m_ROCS_Y;     
  }      
  // mlw Return number of ROCS X     
  int rocsX() const override {   
    return m_ROCS_X;     
  }      
  // mlw Return number of rows per roc   
  int rowsperroc() const override {      
    return m_ROWS_PER_ROC;   
  }      
  // mlw Return number of cols per roc   
  int colsperroc() const override {      
    return m_COLS_PER_ROC;   
  }
  float xoffset() const {
    return m_xoffset;
  }
  float yoffset() const {
    return m_yoffset;
  }


private:

  float m_pitchx;
  float m_pitchy;
  float m_xoffset;
  float m_yoffset;
  int m_nrows;
  int m_ncols;
  int m_ROWS_PER_ROC;
  int m_COLS_PER_ROC;
  int m_ROCS_X;
  int m_ROCS_Y;
  bool m_upgradeGeometry;
};

#endif