void factfits::StageRow ( size_t  row, char *  dest  )

inlineprivatevirtual

Reimplemented from zfits.

Definition at line 44 of file factfits.h.

References fits::Table::bytes_per_row, data, fits::fBufferRow, fNumRoi, fOffsetCalibration, fOffsetData, fOffsetStartCellData, fits::fTable, and zfits::StageRow().

    {
        zfits::StageRow(row, dest);

        // This file does not contain fact data or no calibration to be applied
        if (fOffsetCalibration.empty())
            return;

        //re-get the pointer to the data to access the offsets
        const uint8_t offset = (row*fTable.bytes_per_row)%4;

        int16_t *startCell = reinterpret_cast<int16_t*>(fBufferRow.data() + offset + fOffsetStartCellData);
        int16_t *data      = reinterpret_cast<int16_t*>(fBufferRow.data() + offset + fOffsetData);

         /*
         for (uint32_t i=0; i<1440*1024; i+=1024, startCell++)
         {
             if (*startCell < 0)
             {
                 data += fNumRoi;
                 continue;
             }
             for (uint32_t j=0; j<fNumRoi; j++, data++)
                 *data += fOffsetCalibration[i + (*startCell+j)%1024];
         }
         */

        // This version is faster because the compilers optimization
        // is not biased by the evaluation of %1024
        for (int ch=0; ch<1440; ch++)
        {
            if (startCell[ch]<0)
            {
                data += fNumRoi;
                continue;
            }

            const int16_t modStart = startCell[ch] % 1024;
            const int16_t *off = fOffsetCalibration.data() + ch*1024;

            const int16_t *cal = off+modStart;
            const int16_t *end_stride = data+fNumRoi;

            if (modStart+fNumRoi>1024)
            {
                while (cal<off+1024)
                    *data++ += *cal++;

                cal = off;
            }
            while (data<end_stride)
                *data++ += *cal++;
        }

    }

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