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https://issues.apache.org/jira/browse/PDFBOX-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16982767#comment-16982767
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Tilman Hausherr commented on PDFBOX-4692:
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1) I can't tell, sometimes it is there and sometimes it isn't. For some font
types is must be there, but it isn't because the PDF isn't a correct one.
2) Not all fonts have a path. Type 3 fonts don't have one. For vector fonts
just call getPath() on the individual codes and you'll get a path. However
there are differences in handling the transformation, see the example.
What I could do is to mention the example in the getHeight() method.
> 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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