PixelChannelIdentifier.h

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#ifndef DATAFORMATS_PIXELCHANMNELIDENTIFIER_H
#define DATAFORMATS_PIXELCHANMNELIDENTIFIER_H
 
#include <utility>
 
namespace pixelchanelidentifierimpl {
  class Packing {
  public:
    using PackedDigiType = unsigned int;
 
    // Constructor: pre-computes masks and shifts from field widths
    constexpr Packing(unsigned int row_w, unsigned int column_w, unsigned int time_w, unsigned int adc_w)
        : row_width(row_w),
          column_width(column_w),
          adc_width(adc_w),
          row_shift(0),
          column_shift(row_shift + row_w),
          time_shift(column_shift + column_w),
          adc_shift(time_shift + time_w),
          row_mask(~(~0U << row_w)),
          column_mask(~(~0U << column_w)),
          time_mask(~(~0U << time_w)),
          adc_mask(~(~0U << adc_w)),
          rowcol_mask(~(~0U << (column_w + row_w))),
          max_row(row_mask),
          max_column(column_mask),
          max_adc(adc_mask) {}
 
    const int row_width;
    const int column_width;
    const int adc_width;
 
    const int row_shift;
    const int column_shift;
    const int time_shift;
    const int adc_shift;
 
    const PackedDigiType row_mask;
    const PackedDigiType column_mask;
    const PackedDigiType time_mask;
    const PackedDigiType adc_mask;
    const PackedDigiType rowcol_mask;
 
    const int max_row;
    const int max_column;
    const int max_adc;
  };
}  // namespace pixelchanelidentifierimpl
 
class PixelChannelIdentifier {
public:
  typedef unsigned int PackedDigiType;
  typedef unsigned int ChannelType;
 
  static std::pair<int, int> channelToPixel(int ch) {
    int row = (ch >> thePacking.column_width) & thePacking.row_mask;
    int col = ch & thePacking.column_mask;
    return std::pair<int, int>(row, col);
  }
 
  static int pixelToChannel(int row, int col) { return (row << thePacking.column_width) | col; }
 
  using Packing = pixelchanelidentifierimpl::Packing;
 
public:
  constexpr static Packing packing() { return Packing(8, 9, 4, 11); }
 
  constexpr static Packing thePacking = {11, 11, 0, 10};
};
 
#endif