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#ifndef DataFormats_SiPixelDetId_interface_PixelChannelIdentifier_h
#define DataFormats_SiPixelDetId_interface_PixelChannelIdentifier_h
#include <utility>
#include <cstdint>
namespace pixelchannelidentifierimpl {
/**
* Pack the pixel information to use less memory
*/
class Packing {
public:
using PackedDigiType = uint32_t;
// Constructor: pre-computes masks and shifts from field widths
constexpr Packing(unsigned int row_w, unsigned int column_w, unsigned int flag_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),
flag_shift(column_shift + column_w),
adc_shift(flag_shift + flag_w),
row_mask(~(~0U << row_w)),
column_mask(~(~0U << column_w)),
flag_mask(~(~0U << flag_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 uint32_t row_width;
const uint32_t column_width;
const uint32_t adc_width;
const uint32_t row_shift;
const uint32_t column_shift;
const uint32_t flag_shift;
const uint32_t adc_shift;
const PackedDigiType row_mask;
const PackedDigiType column_mask;
const PackedDigiType flag_mask;
const PackedDigiType adc_mask;
const PackedDigiType rowcol_mask;
const int max_row;
const int max_column;
const int max_adc;
};
} // namespace pixelchannelidentifierimpl
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 = pixelchannelidentifierimpl::Packing;
public:
constexpr static Packing packing() { return Packing(8, 9, 4, 11); }
constexpr static Packing thePacking = {11, 10, 1, 10};
};
#endif // DataFormats_SiPixelDetId_interface_PixelChannelIdentifier_h
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