src/main/java/org/apache/pdfbox/jbig2/segments/GenericRefinementRegion.java [310:316]:
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        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 [373:379]:
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                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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