Bug 295538 – REGRESSION(287399@main): [Skia] Broke rendering of various PDFs

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Michael Catanzaro]

Load https://www.transitchicago.com/assets/1/6/Slow_Zone_Map_-_June_2025.pdf and scroll down to the second page. Notice the rendering is garbled and broken.

I finally bisected it; sorry it took so long. This is a regression from 287399@main "[GTK][WPE][Skia] Allow cross-thread transfer of accelerated ImageBitmap".

[Michael Catanzaro]

We should probably revert 287399@main.

[Michael Catanzaro]

A revert actually does fix this bug, so let's do that for now.

[Pawel Lampe]

Yes, a revert is very good idea especially that the commit in question is just a performance improvement.

Unless already reverted, I'll revert tomorrow.

[Michael Catanzaro]

I prepared a revert in https://github.com/WebKit/WebKit/pull/55184 but I see I failed to link it to this bug report, oops.

[Nikolas Zimmermann]

I got a fix for this, will need to clean it up tomorrow and will submit a PR.

[Nikolas Zimmermann]

Pull request: https://github.com/WebKit/WebKit/pull/55405

[Nikolas Zimmermann]

Michael, I'd be glad if you could confirm that this fully fixes the regression for you as well -- the PR is still lacking a test, I'm thinking about a proper way to capture the problem in a layout test..

[EWS]

Committed 304687@main (48db7480703c): <https://commits.webkit.org/304687@main>

Reviewed commits have been landed. Closing PR #55405 and removing active labels.

[Michael Catanzaro]

Confirmed fixed, thank you!