4093   unsigned char* prevline = 0;  in unfilter()  local
4105 …CERROR_TRY_RETURN(unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterTy…  in unfilter()
4107     prevline = &out[outindex];  in unfilter()
5158 …id filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline,  in filterScanline()  argument
5168       if(prevline)  in filterScanline()
5180       if(prevline)  in filterScanline()
5182         for(i = 0; i < length; i++) out[i] = scanline[i] - prevline[i];  in filterScanline()
5190       if(prevline)  in filterScanline()
5192         for(i = 0; i < bytewidth; i++) out[i] = scanline[i] - prevline[i] / 2;  in filterScanline()
5193 …= bytewidth; i < length; i++) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) / 2);  in filterScanline()
5202       if(prevline)  in filterScanline()
5205         for(i = 0; i < bytewidth; i++) out[i] = (scanline[i] - prevline[i]);  in filterScanline()
5208 …out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidt…  in filterScanline()
5245   const unsigned char* prevline = 0;  in filter()  local
5275       filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, 0);  in filter()
5276       prevline = &in[inindex];  in filter()
5300 …      filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);  in filter()
5328         prevline = &in[y * linebytes];  in filter()
5357 …      filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);  in filter()
5375       prevline = &in[y * linebytes];  in filter()
5392       filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type);  in filter()
5393       prevline = &in[inindex];  in filter()
5428 …      filterScanline(attempt[type].data, &in[y * linebytes], prevline, linebytes, bytewidth, type);  in filter()
5440       prevline = &in[y * linebytes];  in filter()