SiPixelDbItem::Packing Class Reference

Pack the pixel information to use less memory. More...

Public Member Functions
	Packing (int noise_w, int pedestal_w, int gain_w, int status_w)

Public Attributes
PackedPixDbType	gain_mask
int	gain_shift
PackedPixDbType	noise_mask
int	noise_shift
int	noise_width
PackedPixDbType	pedestal_mask
int	pedestal_shift
int	pedestal_width
PackedPixDbType	status_mask
int	status_shift
int	status_width

Detailed Description

Pack the pixel information to use less memory.

Definition at line 47 of file SiPixelDbItem.h.

Constructor & Destructor Documentation

Packing()

SiPixelDbItem::Packing::Packing	(	int	noise_w,
		int	pedestal_w,
		int	gain_w,
		int	status_w
	)

Definition at line 64 of file SiPixelDbItem.cc.

    : noise_width(noise_w), pedestal_width(pedestal_w), status_width(status_w) {
  // Constructor: pre-computes masks and shifts from field widths
  // Order of fields (from right to left) is
  // noise, pedestal, gain, status count.
 
  if (noise_w + pedestal_w + gain_w + status_w != 32) {
    std::cout << std::endl
              << "Error in SiPixelDbItem::Packing constructor:"
              << "sum of field widths != 32" << std::endl;
    // TO DO: throw an exception?
  }
 
  // Fields are counted from right to left!
 
  noise_shift = 0;
  pedestal_shift = noise_shift + noise_w;
  gain_shift = pedestal_shift + pedestal_w;
  status_shift = gain_shift + gain_w;
 
  // Ensure the complement of the correct
  // number of bits:
  PackedPixDbType zero32 = 0;  // 32-bit wide
 
  noise_mask = ~(~zero32 << noise_w);
  pedestal_mask = ~(~zero32 << pedestal_w);
  gain_mask = ~(~zero32 << gain_w);
  status_mask = ~(~zero32 << status_w);
}

References gather_cfg::cout, gain_mask, gain_shift, noise_mask, noise_shift, pedestal_mask, pedestal_shift, status_mask, and status_shift.

Member Data Documentation

gain_mask

PackedPixDbType SiPixelDbItem::Packing::gain_mask

Definition at line 58 of file SiPixelDbItem.h.

Referenced by SiPixelDbItem::gain(), Packing(), and SiPixelDbItem::setGain().

gain_shift

int SiPixelDbItem::Packing::gain_shift

Definition at line 54 of file SiPixelDbItem.h.

Referenced by SiPixelDbItem::gain(), Packing(), SiPixelDbItem::set(), and SiPixelDbItem::setGain().

noise_mask

PackedPixDbType SiPixelDbItem::Packing::noise_mask

Definition at line 59 of file SiPixelDbItem.h.

Referenced by SiPixelDbItem::noise(), Packing(), and SiPixelDbItem::setNoise().

noise_shift

int SiPixelDbItem::Packing::noise_shift

Definition at line 55 of file SiPixelDbItem.h.

Referenced by SiPixelDbItem::noise(), Packing(), SiPixelDbItem::set(), and SiPixelDbItem::setNoise().

noise_width

int SiPixelDbItem::Packing::noise_width

Definition at line 61 of file SiPixelDbItem.h.

pedestal_mask

PackedPixDbType SiPixelDbItem::Packing::pedestal_mask

Definition at line 60 of file SiPixelDbItem.h.

Referenced by Packing(), SiPixelDbItem::pedestal(), and SiPixelDbItem::setPedestal().

pedestal_shift

int SiPixelDbItem::Packing::pedestal_shift

Definition at line 56 of file SiPixelDbItem.h.

Referenced by Packing(), SiPixelDbItem::pedestal(), SiPixelDbItem::set(), and SiPixelDbItem::setPedestal().

pedestal_width

int SiPixelDbItem::Packing::pedestal_width

Definition at line 62 of file SiPixelDbItem.h.

status_mask

PackedPixDbType SiPixelDbItem::Packing::status_mask

Definition at line 57 of file SiPixelDbItem.h.

Referenced by Packing(), SiPixelDbItem::setStatus(), and SiPixelDbItem::status().

status_shift

int SiPixelDbItem::Packing::status_shift

Definition at line 53 of file SiPixelDbItem.h.

Referenced by Packing(), SiPixelDbItem::set(), SiPixelDbItem::setStatus(), and SiPixelDbItem::status().

status_width

int SiPixelDbItem::Packing::status_width

Definition at line 63 of file SiPixelDbItem.h.