[Webkit-unassigned] [Bug 181757] New: [WPE] Content disappearing when using CSS transforms

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 17 11:47:12 PST 2018


https://bugs.webkit.org/show_bug.cgi?id=181757

            Bug ID: 181757
           Summary: [WPE] Content disappearing when using CSS transforms
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebKit WPE
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: steffen at deusch.me
                CC: bugs-noreply at webkitgtk.org

Hello everyone,
I noticed a rather critical bug using the WPE WebKit port. I already opened an issue in the WPEWebKit repo on GitHub, but Wouter van Boessschoten (w.van.boesschoten at metrological.com) told me to file a report here too.
The original issue is located here: https://github.com/WebPlatformForEmbedded/WPEWebKit/issues/434#issue-286382861

Summary: When using CSS transforms to create a scrolling element animation, the animated content simply disappears after a while:
https://s3.eu-central-1.amazonaws.com/steffend/public/wpe-test-rpi3/rss-scroller/vid.mp4
Notice, that as soon as another element changes, the content appears again (keep an eye on the 'random' value), until it abruptly stops again.
Repro: https://s3.eu-central-1.amazonaws.com/steffend/public/wpe-test-rpi3/rss-scroller/rss.html

Another example with the same issue: https://s3.eu-central-1.amazonaws.com/steffend/public/webkitbug/WPEScrollBug.mp4 (this should be an endlessly scrolling table)
Repro: https://s3.eu-central-1.amazonaws.com/steffend/public/webkitbug/scrolling.html

Opening these pages in Safari/Firefox/Chromium works as expected (apart from https://bugs.webkit.org/show_bug.cgi?id=181709).

Hardware: Raspberry Pi 3
Build method: WPE Buildroot (https://github.com/WebPlatformForEmbedded/buildroot), same using Yocto (https://github.com/WebPlatformForEmbedded/meta-wpe) + Westeros.
WPE commit id: 959d9b1d2555da0ce65bd0198bc509dd08e9f910 (doesn't matter, same problem in every version I tested, master and stable)

As I am using these animation techniques in production, I am currently forced to use Chromium-based boxes, but I'd appreciate using a custom-built RPi image much more.

Thanks for any help!
Steffen Deusch

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