Bug 228120 - Layer tree unfreezing and rendering update scheduling need to work together
Summary: Layer tree unfreezing and rendering update scheduling need to work together
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: Safari Technology Preview
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2021-07-20 12:31 PDT by Simon Fraser (smfr)
Modified: 2021-07-27 12:32 PDT (History)
5 users (show)

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Description Simon Fraser (smfr) 2021-07-20 12:31:27 PDT 
We currently rely on timers to trigger style updates/render tree updates, and this is necessary to trigger unfreezing the layer tree (via visually empty threshold). Ideally the style system would not have any of its own timers; it would just schedule rendering updates. However, TiledCoreAnimationDrawingArea::triggerRenderingUpdate() just bails if the layer tree is frozen.

We need to somehow harmonize layer tree freezing with rendering updates.
Comment 1 Simon Fraser (smfr) 2021-07-20 12:32:00 PDT 
See rdar://75362363 and http://trac.webkit.org/changeset/272300/webkit
Comment 2 Sam Weinig 2021-07-21 16:57:12 PDT 
(In reply to Simon Fraser (smfr) from comment #1)
> See rdar://75362363 and http://trac.webkit.org/changeset/272300/webkit

... and https://trac.webkit.org/changeset/280112/webkit
Comment 3 Radar WebKit Bug Importer 2021-07-27 12:32:20 PDT 
<rdar://problem/81176458>