129     int                 mnPreviewMask;  // == ((1 << mnPreviewShift) - 1)  member in vcl::PNGReaderImpl
246     mnPreviewMask = (1 << mnPreviewShift) - 1;  in PNGReaderImpl()
697             mnPreviewMask = (1 << mnPreviewShift) - 1;  in ImplReadHeader()
701     maTargetSize.Width()  = (maOrigSize.Width() + mnPreviewMask) >> mnPreviewShift;  in ImplReadHeader()
702     maTargetSize.Height() = (maOrigSize.Height() + mnPreviewMask) >> mnPreviewShift;  in ImplReadHeader()
1035         if( mnPreviewMask & (pParam->mnXStart | pParam->mnYStart) )  in ImplPreparePass()
1178     if( mnYpos & mnPreviewMask )  in ImplDrawScanline()
1180     if( nXStart & mnPreviewMask )  in ImplDrawScanline()
1631     if( nX & mnPreviewMask )  in ImplSetPixel()
1643     if( nX & mnPreviewMask )  in ImplSetPixel()
1655     if( nX & mnPreviewMask )  in ImplSetTranspPixel()
1673     if( nX & mnPreviewMask )  in ImplSetAlphaPixel()
1687     if( nX & mnPreviewMask )  in ImplSetAlphaPixel()