Tilman Hausherr created PDFBOX-6220:
---------------------------------------
Summary: 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
Affects Versions: 3.0.8 PDFBox
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
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}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
