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https://issues.apache.org/jira/browse/PDFBOX-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16983940#comment-16983940
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Maruan Sahyoun commented on PDFBOX-4692:
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I'd like to add some information specific for Type 3 fonts. As Tilman already
pointed out for some fonts having a font descriptor is required. But for type 3
fonts the spec (1.5) has this
{quote}
Font descriptors shall not be used with Type 0 fonts. Beginning with PDF 1.5,
font descriptors may be used with Type 3 fonts.
{quote}
So for that it's perfectly fine that there is no font descriptor and thus the
call returns {{null}}
And event if there is one regarding ascent/descent the spec has this
{quote}
Ascent number (Required, except for Type 3 fonts)
The maximum height above the baseline reached by glyphs in this font. The
height of glyphs for accented characters shall be excluded.
Descent number (Required, except for Type 3 fonts)
The maximum depth below the baseline reached by glyphs in this font. The value
shall be a negative number.
{quote}
Hope that clarifies that you can not depend on having that information even in
a conforming file. And as Tilman pointed out there are many non conforming
files out there.
> 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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