194184 2019-02-01 19:23:13 -0800 Async overflow scroll is jumpy on macOS if the main thread is busy 2019-02-02 11:18:42 -0800 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 simon.fraser simon.fraser fred.wang koivisto simon.fraser webkit-bug-importer oldest_to_newest 1501415 0 360950 simon.fraser 2019-02-01 19:23:13 -0800 Created attachment 360950 Testcase Main thread and scrolling thread seem to be fighting over scroll positions. 1501421 1 simon.fraser 2019-02-01 20:05:31 -0800 While we're scrolling on the scrolling thread, we post back to the main thread via AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll(), which triggers RendderLayer::scrollTo() and then does a compositing update, and that update slams a stale scroll position onto the graphics layer. 1501423 2 webkit-bug-importer 2019-02-01 20:06:05 -0800 <rdar://problem/47758655> 1501426 3 simon.fraser 2019-02-01 20:07:23 -0800 iOS avoids this with: if (m_owningLayer.isInUserScroll()) { // If scrolling is happening externally, we don't want to touch the layer bounds origin here because that will cause jitter. m_scrollingLayer->syncBoundsOrigin(scrollOffset); m_owningLayer.setRequiresScrollBoundsOriginUpdate(true); } else { 1501452 4 360963 simon.fraser 2019-02-01 22:10:20 -0800 Created attachment 360963 Patch 1501458 5 360963 koivisto 2019-02-01 23:03:33 -0800 Comment on attachment 360963 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=360963&action=review > Source/WebCore/ChangeLog:3 > + Async overflow scroll is jumpy if the main thread is busy "on Mac" > Source/WebCore/rendering/RenderLayerBacking.cpp:1759 > - m_scrollingContentsLayer->setPaintingPhase(paintPhase); > - m_scrollingLayer->addChild(*m_scrollingContentsLayer); > + m_scrolledContentsLayer->setPaintingPhase(paintPhase); > + m_scrollingLayer->addChild(*m_scrolledContentsLayer); Could have also renamed m_scrollingLayer -> m_scrollContainerLayer 1501464 6 simon.fraser 2019-02-01 23:30:38 -0800 I can do that in a followup if rs=you. 1501465 7 koivisto 2019-02-01 23:35:39 -0800 (In reply to Simon Fraser (smfr) from comment #6) > I can do that in a followup if rs=you. rs=me 1501507 8 simon.fraser 2019-02-02 11:18:42 -0800 https://trac.webkit.org/changeset/240897/webkit 360950 2019-02-01 19:23:13 -0800 2019-02-01 19:23:13 -0800 Testcase interleaved-overflow-scroll.html text/html 5855 simon.fraser PCFET0NUWVBFIGh0bWw+Cgo8aHRtbD4KPGhlYWQ+CiAgICA8c3R5bGU+CiAgICAgICAgLnNjcm9s bGVyIHsKICAgICAgICAgICAgbWFyZ2luOiAyMHB4OwogICAgICAgICAgICB3aWR0aDogNDAwcHg7 CiAgICAgICAgICAgIGhlaWdodDogNDAwcHg7CiAgICAgICAgICAgIG92ZXJmbG93OiBhdXRvOwog ICAgICAgICAgICBib3JkZXI6IDIwcHggc29saWQgcmdiYSgwLCAwLCAxMjgsIDAuNSk7CiAgICAg ICAgICAgIHBhZGRpbmc6IDEwcHg7CiAgICAgICAgfQogICAgICAgIC5wb3NpdGlvbmVkIHsKICAg ICAgICAgICAgcG9zaXRpb246IHJlbGF0aXZlOwogICAgICAgICAgICBsZWZ0OiAzMDBweDsKICAg ICAgICAgICAgaGVpZ2h0OiAyMDBweDsKICAgICAgICAgICAgd2lkdGg6IDIwMHB4OwogICAgICAg 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