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https://issues.apache.org/jira/browse/PDFBOX-4909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157192#comment-17157192
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Alfred commented on PDFBOX-4909:
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Tested with latest changes, everything works fine and the performance is
improved.
I still see it called a lot and it's still bad.
We could try to compute it once per font and cache the calculation in the font
object itself.
Or we could use a map and to store height for each font name.
I tried but some of the tests fail, so this is beyond skills at the moment :)
> Don't calculate font height for every glyph
> -------------------------------------------
>
> Key: PDFBOX-4909
> URL: https://issues.apache.org/jira/browse/PDFBOX-4909
> Project: PDFBox
> Issue Type: Improvement
> Components: Text extraction
> Affects Versions: 2.0.0, 3.0.0 PDFBox
> Reporter: Alfred
> Assignee: Tilman Hausherr
> Priority: Major
> Labels: Optimization
> Fix For: 2.0.21, 3.0.0 PDFBox
>
> Attachments: PDFBOX-4909.patch
>
>
> LegacyPDFStreamEngine computes font height for every glyph and the
> computation is rather heavy, to work around all known problems.
> Instead of computing for every glyph, we can recompute only when the font
> changes. The SetFontAndSize operator will be invoked when the font changes so
> we can use that to compute and store the height to have it ready when needed
> in showGlyph.
>
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