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https://issues.apache.org/jira/browse/PDFBOX-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16975962#comment-16975962
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Tilman Hausherr commented on PDFBOX-4692:
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This is descried in the PDF specification, but even that won't help you. The
ascent / descent entries are not always reliable. With type 3 fonts you can use
the bounds, but that too may or may not be reliable.
> Document if and when PDFont.getFontDescriptor() may return null
> ---------------------------------------------------------------
>
> Key: PDFBOX-4692
> URL: https://issues.apache.org/jira/browse/PDFBOX-4692
> Project: PDFBox
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 2.0.17
> Environment: Windows 10.0.18362.418
> Reporter: Gili
> Priority: Major
> Attachments: image-2019-11-16-22-03-15-015.png
>
>
> Please document under which conditions {{PDFont.getFontDescriptor()}} may
> return null and what can be done to calculate the text ascent/descent.
> Clearly, this should be possible to calculate as the text ends up getting
> rendered.
> Background information:
> I have a PDF file (credit card statement, so it cannot be shared easily) that
> contains an embedded {{PDType3Font}} called "C0EX06Q0". When I invoke
> {{PDFont.getFontDescriptor()}} I get null.
> I have a screenshot of what it looks like.
> !image-2019-11-16-22-03-15-015.png|thumbnail!
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