[jira] [Resolved] (PDFBOX-6220) Cache gsubworker to avoid GSUB splitter rebuilt on every showText

["Tilman Hausherr (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-6220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr resolved PDFBOX-6220.
-------------------------------------
    Resolution: Fixed

> Cache gsubworker to avoid GSUB splitter rebuilt on every showText
> -----------------------------------------------------------------
>
>                 Key: PDFBOX-6220
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-6220
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: FontBox
>    Affects Versions: 3.0.8 PDFBox
>            Reporter: Tilman Hausherr
>            Assignee: Tilman Hausherr
>            Priority: Major
>              Labels: gsub
>             Fix For: 3.0.9 PDFBox, 4.0.0
>
>
> {quote}Profiling PDF text rendering with openhtmltopdf (PDFBox 3.0.4, but I also
> checked 3.0.8 and trunk), I found that GsubWorkerForLatin.applyGsubFeature
> builds a new GlyphArraySplitterRegexImpl on every call. That regex depends
> only on the font, not on the text, but it gets rebuilt on every showText
> call, because PDAbstractContentStream recreates the GsubWorker in setFont
> on every call instead of keeping the one already cached in gsubWorkers.
> In our specific case, on a 14-page PDF, using a font with a ccmp feature
> (Inter), this rebuilding represents most of the time spent drawing text.
> Caching the splitter regex per font (local test with patched PDFBox) saves
> about 250 ms. The output is unchanged.{quote}



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