commit | 5c771eea33d162b4d4a828b8c408fc12c687b5b3 | [log] [tgz] |
---|---|---|
author | Olga Gerchikov <gerchiko@microsoft.com> | Wed Mar 18 18:36:30 2020 |
committer | Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> | Wed Mar 18 18:48:31 2020 |
tree | c5c37012e1cbcff77b11c2f4fa994928b49d0d20 | |
parent | c903e42d305bea2c615fe11b4281af507706ce32 [diff] |
Implement main thread scroll offset snapshotting Per https://wicg.github.io/scroll-animations/#avoiding-cycles, snapshot scroll timeline state once per frame. Changes made: - Snapshotting is done by saving scroll timeline current time and phase. - Snapshot scroll timeline state as part of the ScrollTimeline constructor. - Every time ScrollTimeline needs to query current time or phase, use the snapshot. - Any scroller layout change calls scroll timeline invalidation. - When scroll timeline is invalidated outside of the document lifecycle update, its state is re-snapshotted and attached animations are marked as outdated. This is required to ensure correctness of user scripts that query animation properties after scroller updates, like the following: scroller.scrollTop = 100; console.log(anim.effect.getComputedTiming().localTime); console.log(timeline.currentTime); - If scroll timeline is invalidated during lifecycle update the same procedure of snapshotting and marking the animations as outdated runs right after the lifecycle update. Bug: 944449 Change-Id: Id4330a15501b3a1312803d06e4ab9e3130ee3ee1 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2005629 Commit-Queue: Olga Gerchikov <gerchiko@microsoft.com> Reviewed-by: Philip Rogers <pdr@chromium.org> Reviewed-by: Mason Freed <masonfreed@chromium.org> Reviewed-by: Majid Valipour <majidvp@chromium.org> Cr-Commit-Position: refs/heads/master@{#751412}
The web-platform-tests Project is a cross-browser test suite for the Web-platform stack. Writing tests in a way that allows them to be run in all browsers gives browser projects confidence that they are shipping software that is compatible with other implementations, and that later implementations will be compatible with their implementations. This in turn gives Web authors/developers confidence that they can actually rely on the Web platform to deliver on the promise of working across browsers and devices without needing extra layers of abstraction to paper over the gaps left by specification editors and implementors.
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