127 …int                 mnPreviewShift; // shift to convert orig image coords into preview image coords  member in vcl::PNGReaderImpl
244     mnPreviewShift = 0;  in PNGReaderImpl()
245     mnPreviewMask = (1 << mnPreviewShift) - 1;  in PNGReaderImpl()
703                     mnPreviewShift = i;  in ImplReadHeader()
705             mnPreviewMask = (1 << mnPreviewShift) - 1;  in ImplReadHeader()
709     maTargetSize.Width()  = (maOrigSize.Width() + mnPreviewMask) >> mnPreviewShift;  in ImplReadHeader()
710     maTargetSize.Height() = (maOrigSize.Height() + mnPreviewMask) >> mnPreviewShift;  in ImplReadHeader()
1193     const sal_uInt32 nY = mnYpos >> mnPreviewShift;  in ImplDrawScanline()
1359                         if( nXAdd == 1 && mnPreviewShift == 0 )  // copy raw line data if possible  in ImplDrawScanline()
1398 …          bCkeckDirectScanline && !nXStart && 1 == nXAdd && !mnPreviewShift && mpAcc && mpMaskAcc);  in ImplDrawScanline()
1545                 bCkeckDirectScanline && !nXStart && 1 == nXAdd && !mnPreviewShift && mpAcc);  in ImplDrawScanline()
1641     nX >>= mnPreviewShift;  in ImplSetPixel()
1653     nX >>= mnPreviewShift;  in ImplSetPixel()
1667     nX >>= mnPreviewShift;  in ImplSetTranspPixel()
1685     nX >>= mnPreviewShift;  in ImplSetAlphaPixel()
1701     nX >>= mnPreviewShift;  in ImplSetAlphaPixel()