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Posted to dev@pdfbox.apache.org by "Alfred (Jira)" <ji...@apache.org> on 2020/07/06 13:26:00 UTC

[jira] [Created] (PDFBOX-4909) Don't calculate font height for every glyph

Alfred created PDFBOX-4909:
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             Summary: 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


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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