Cherry-pick openjpeg changes to speed up jpeg2000 decoding on arm [pdfium : main]
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Nico Weber (Gerrit)
May 5, 2026, 3:14:20 PM (8 days ago) May 5
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Lei Zhang (Gerrit)
May 5, 2026, 3:52:40 PM (8 days ago) May 5
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Nico Weber (Gerrit)
May 5, 2026, 3:54:33 PM (8 days ago) May 5
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Nico Weber (Gerrit)
May 5, 2026, 3:54:43 PM (8 days ago) May 5
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pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com (Gerrit)
May 5, 2026, 3:56:51 PM (8 days ago) May 5
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Change information
Commit message:
Cherry-pick openjpeg changes to speed up jpeg2000 decoding on arm
On my system (Apple M4 Max), takes
pdfium_test --pages=1-50 disquisitionesa00gaus.pdf
from 1.637 s ± 0.008 s to 1.477 s ± 0.007 s (measured using hyperfine).
File available here: https://archive.org/details/disquisitionesa00gaus
No intended behavior change.
While here, update README.pdfium to note that another of our downstream
patches has been upstreamed.
Bug: none
Change-Id: Ie55ffafb8ab9f5cb690de094e6236444b9b772b1
Reviewed-by: Lei Zhang <the...@chromium.org>
Reviewed-by: Nico Weber <tha...@google.com>
Commit-Queue: Nico Weber <tha...@chromium.org>
Files:
- A third_party/libopenjpeg/0048-dwt_neon_9-7_idwt.patch
- A third_party/libopenjpeg/0049-dwt_neon_5-3_idwt.patch
- M third_party/libopenjpeg/README.pdfium
- M third_party/libopenjpeg/dwt.c
Change size: L
Delta: 4 files changed, 327 insertions(+), 15 deletions(-)
Branch: refs/heads/main
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Code-Review: +1 by Nico Weber, +1 by Lei Zhang
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