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#ifndef CondFormats_SiPixelObjects_SiPixelDbItem_h
#define CondFormats_SiPixelObjects_SiPixelDbItem_h
//----------------------------------------------------------------------------
//! \class SiPixelPedestals
//! \brief Event Setup object which holds DB information for all pixels.
//!
//! \description Event Setup object which holds DB information for all pixels.
//! DB info for a single pixel is held in SiPixelDbItem, which contains
//! pedestal, noise, gain and status bits packed into an 32-bit wide unsigned
//! int. The bit allocation is the following:
//! bits [31:24] - status (0 if good, bits TBD set if not good)
//! bits [23:16] - gain (upper 4 bits integer part, 4 bits fractional part)
//! bits [15:8] - pedestal (upper 6 bits integer part, 2 bits fractional part)
//! bits [7:0] - noise (upper 6 bits integer part, 2 bits fractional part)
//-----------------------------------------------------------------------------
#include "CondFormats/Serialization/interface/Serializable.h"
#include <cstdint>
class SiPixelDbItem {
typedef uint32_t PackedPixDbType;
public:
SiPixelDbItem() : packedVal_(0) { set(2, 0, 1.0, 0); } // TO DO: is noise==2 in shifted rep or not???
~SiPixelDbItem() {}
inline short noise() { return (packedVal_ >> packing_.noise_shift) & packing_.noise_mask; }
inline short pedestal() { return (packedVal_ >> packing_.pedestal_shift) & packing_.pedestal_mask; }
inline float gain() { return (packedVal_ >> packing_.gain_shift) & packing_.gain_mask; }
inline char status() { return (packedVal_ >> packing_.status_shift) & packing_.status_mask; }
inline PackedPixDbType packedValue() { return packedVal_; }
inline void setPackedVal(PackedPixDbType p) { packedVal_ = p; }
// The following setters are not inline since they are more complicated:
void setNoise(short n);
void setPedestal(short p);
void setGain(float g);
void setStatus(char s);
void set(short noise, short pedestal, float gain, char status);
private:
PackedPixDbType packedVal_;
//! Pack the pixel information to use less memory
class Packing {
public:
//--- Constructor: pre-computes masks and shifts from field widths
Packing(int noise_w, int pedestal_w, int gain_w, int status_w);
//--- Public data:
int status_shift;
int gain_shift;
int noise_shift;
int pedestal_shift;
PackedPixDbType status_mask;
PackedPixDbType gain_mask;
PackedPixDbType noise_mask;
PackedPixDbType pedestal_mask;
int noise_width;
int pedestal_width;
int status_width;
};
static Packing packing_;
COND_SERIALIZABLE;
};
#endif
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