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https://issues.apache.org/jira/browse/PDFBOX-4909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17164291#comment-17164291
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Alfred commented on PDFBOX-4909:
--------------------------------
[~mkl], you said "_I would propose to re-open this issue because one fact is
ignored: The *current text font* is a part of the *text state* which in turn is
part of the *graphics state*._"
I am looking at PDGraphicsState and I don't see fonts there.
Also, when PDFStreamEngine saves the graphic state it does
graphicsStack.push(new PDGraphicsState(rect));
so it does not pass the current font.
I think the reason we did not see any text extraction bugs after this change is
because there are no bugs :)
> 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, Untitled.png
>
>
> 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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