[calixteman]

Keep small Flate streams marked async and return their JS-decoded bytes so callers wrap them in plain Streams.

For small image streams, prefer native decoding when the expected output exceeds 16 KiB. Preserve repeated reads when requested lengths change.

[github-actions]

Viewer preview

🗑️ Viewer previews removed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.57%. Comparing base (d7fd526) to head (d7e358b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #22385   +/-   ##
=======================================
  Coverage   90.56%   90.57%           
=======================================
  Files         278      278           
  Lines       68562    68568    +6     
=======================================
+ Hits        62096    62106   +10     
+ Misses       6466     6462    -4     

Flag	Coverage Δ
browsertest	66.29% <100.00%> (+0.02%)	⬆️
fonttest	8.99% <22.22%> (+<0.01%)	⬆️
unittest	61.25% <100.00%> (-0.02%)	⬇️
unittestcli	59.01% <100.00%> (-0.02%)	⬇️

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[codspeed]

Merging this PR will regress 1 benchmark

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 85 untouched benchmarks
⏩ 174 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	PDFImage.createImageData: DeviceN, PostScript tint (colorspace_cos.pdf)	11.3 ms	12.9 ms	-12.09%
⚡	PartialEvaluator.buildPath: lines (bug1743245.pdf)	19.4 ms	15 ms	+29.54%
⚡	XFAFactory.getRichTextAsHtml (issue13447.pdf)	2.1 ms	1.9 ms	+10.67%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing calixteman:perf/bug-2086217-flate-small-streams (d7e358b) with master (d7fd526)}

Footnotes

1. 174 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

Reference tests

Results for d7e358b (run, references from mozilla/pdf.js.refs@4694e71d21).

Platform	Status	Tests	Total runtime	Errors	Different	FBF	No reference	Report
	⚠️	1413	12m 27s	0	1	0	0	view differences
	✅	1413	15m 27s	0	0	0	0

The report is kept for 30 days and replaced by the next run.

[Snuffleupagus]

r=me, with a question; thanks.