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/data/refman/pasoursint/CMSSW_5_3_1/src/DataFormats/SiPixelDetId/interface/PixelChannelIdentifier.h

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00001 #ifndef DATAFORMATS_PIXELCHANMNELIDENTIFIER_H
00002 #define DATAFORMATS_PIXELCHANMNELIDENTIFIER_H
00003 
00004 #include <utility>
00005 
00006 class PixelChannelIdentifier{
00007  public:
00008   
00009   typedef unsigned int PackedDigiType;
00010   typedef unsigned int ChannelType;
00011   
00012   static std::pair<int,int> channelToPixel( int ch) {
00013     int row = ( ch >> thePacking.column_width) & thePacking.row_mask;
00014     int col = ch & thePacking.column_mask;
00015     return std::pair<int,int>(row,col);
00016   }
00017   
00018   static int pixelToChannel( int row, int col) {
00019     return (row << thePacking.column_width) | col;
00020   }
00021   
00022  private:
00027   class Packing {
00028   public:
00029     
00030     // Constructor: pre-computes masks and shifts from field widths
00031     Packing(const int row_w, const int column_w, 
00032             const int time_w, const int adc_w);
00033     
00034     // public data:
00035     int adc_shift;
00036     int time_shift;
00037     int row_shift;
00038     int column_shift;
00039     
00040     PackedDigiType adc_mask;
00041     PackedDigiType time_mask;
00042     PackedDigiType row_mask;
00043     PackedDigiType column_mask;
00044     
00045     int row_width;
00046     int column_width;
00047     int adc_width;
00048     
00049     int max_row;
00050     int max_column;
00051     int max_adc;
00052   };
00053   
00054  public:
00055   static Packing   thePacking;
00056 };  
00057 
00058 
00059 #endif