src/main/java/org/apache/pdfbox/jbig2/segments/GenericRefinementRegion.java [352:362]:
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                w1 = w2 = w3 = 0;
                if (modRefByteIdx < refRowStride - 1)
                {
                    if (currentLine >= 1 && (currentLine - 1) < referenceBitmap.getHeight())
                        w1 = referenceBitmap.getByteAsInteger(refByteIndex - refRowStride);
                    if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
                        w2 = referenceBitmap.getByteAsInteger(refByteIndex);
                    if (currentLine >= -1 && currentLine + 1 < referenceBitmap.getHeight())
                        w3 = referenceBitmap.getByteAsInteger(refByteIndex + refRowStride);
                }
                refByteIndex++;
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src/main/java/org/apache/pdfbox/jbig2/segments/GenericRefinementRegion.java [370:379]:
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            w1 = w2 = w3 = 0;
            if (modRefByteIdx < refRowStride - 1)
            {
                if (currentLine >= 1 && (currentLine - 1) < referenceBitmap.getHeight())
                    w1 = referenceBitmap.getByteAsInteger(refByteIndex - refRowStride);
                if (currentLine >= 0 && currentLine < referenceBitmap.getHeight())
                    w2 = referenceBitmap.getByteAsInteger(refByteIndex);
                if (currentLine >= -1 && currentLine + 1 < referenceBitmap.getHeight())
                    w3 = referenceBitmap.getByteAsInteger(refByteIndex + refRowStride);
                refByteIndex++;
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