128     int                 mnPreviewMask;  // == ((1 << mnPreviewShift) - 1)  member in vcl::PNGReaderImpl
245     mnPreviewMask = (1 << mnPreviewShift) - 1;  in PNGReaderImpl()
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()
1043         if( mnPreviewMask & (pParam->mnXStart | pParam->mnYStart) )  in ImplPreparePass()
1186     if( mnYpos & mnPreviewMask )  in ImplDrawScanline()
1188     if( nXStart & mnPreviewMask )  in ImplDrawScanline()
1639     if( nX & mnPreviewMask )  in ImplSetPixel()
1651     if( nX & mnPreviewMask )  in ImplSetPixel()
1665     if( nX & mnPreviewMask )  in ImplSetTranspPixel()
1683     if( nX & mnPreviewMask )  in ImplSetAlphaPixel()
1699     if( nX & mnPreviewMask )  in ImplSetAlphaPixel()