Alfred created PDFBOX-4896:
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Summary: Don't save and restore graphic states around showGlyph in
LegacyPDFStreamEngine
Key: PDFBOX-4896
URL: https://issues.apache.org/jira/browse/PDFBOX-4896
Project: PDFBox
Issue Type: Improvement
Affects Versions: 2.0.20, 3.0.0 PDFBox
Reporter: Alfred
One of the major performance bottlenecks in text extraction was the
clone + push and the pop + clone operations on the graphic state before and
after the call to showGlyph.
Not only it was slow to clone, it also consumes large amounts of memory making
the garbage collector work harder.
When extracting text, showGlyph does not modify the graphic state so there's no
need to save / restore the state.
The same could be true in general, not just for text extraction, but I do not
understand the code well enough to decide. I have only modified the behavior
for the LegacyPDFStreamEngine, to be safe.
The showGlyph operation sounds like a read only operation, that should not
modify anything.
I have the code ready and I will submit a patch and a review.
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