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https://issues.apache.org/jira/browse/PDFBOX-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356330#comment-15356330
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Christopher Clark commented on PDFBOX-3405:
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I guess I could use an IdentityHashmap to map TextPosition objects to the glyph
bounds or display font size, although it feels like a pretty hacky/fragile
solution.
> Display font size
> -----------------
>
> Key: PDFBOX-3405
> URL: https://issues.apache.org/jira/browse/PDFBOX-3405
> Project: PDFBox
> Issue Type: Improvement
> Reporter: Christopher Clark
> Attachments: bad-font-p1.pdf
>
>
> I (along with others) have found using the font size of text to be very
> useful when doing things like trying to recover the structure of PDFs. For
> example, in heuristics like 'text with large font sizes are probably titles'.
> However, I noticed a few cases where getFontSizePt or getFontSize return
> seemingly very inaccurate results. For example, in the attached pdf the
> getFontSizePt for the title text is over 500.
> After digging into this a little, as I understand it neither of these methods
> return the a font size scaled to the display space. getFontSize returns the
> "raw" encoded font size and getFontSizePt returns the font size scaled by the
> text matrix, but not by the current transformation matrix.
> Basically, in order to get reliable font information, it would be helpful if
> either
> 1) getFontSizePt includes the affect of using current transformation matrix
> 2) A new method like "getDisplayFontSize" is added that returns the font
> sizes scaled to the display space
> As a side note, I have seen several users (including myself), assume that
> "getFontSize" returns the font size as would be observed when one opens the
> PDF, and the been confused when these method occasionally do not return the
> results expected. I think "getFontSize" would benefit from a clear note that
> the results might not include scaling factors that were used when the text
> was rendered.
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