197694 2019-05-08 10:01:02 -0700 Event region generation needs to know about backing-sharing 2019-05-10 17:53:25 -0700 1 1 1 Unclassified WebKit Compositing WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 197561 1 simon.fraser koivisto andersca commit-queue koivisto simon.fraser webkit-bug-importer oldest_to_newest 1534349 0 simon.fraser 2019-05-08 10:01:02 -0700 When we use backing-store sharing for composting, event region generation also needs to run code to get shared layers to produce event regions. This will fix fast/scrolling/ios/overflow-scroll-overlap-4.html 1534350 1 simon.fraser 2019-05-08 10:02:43 -0700 For now I'll mark this as a test failure in TestExpectations. 1534351 2 webkit-bug-importer 2019-05-08 10:03:10 -0700 <rdar://problem/50584991> 1534352 3 webkit-bug-importer 2019-05-08 10:03:13 -0700 <rdar://problem/50584994> 1534959 4 369547 koivisto 2019-05-10 00:39:52 -0700 Created attachment 369547 patch 1534961 5 369548 koivisto 2019-05-10 01:10:30 -0700 Created attachment 369548 patch 1534987 6 369548 andersca 2019-05-10 07:17:26 -0700 Comment on attachment 369548 patch View in context: https://bugs.webkit.org/attachment.cgi?id=369548&action=review > Source/WebCore/rendering/RenderLayerBacking.cpp:1497 > + for (auto& layerWeakPtr : m_backingSharingLayers) > + layerWeakPtr->paintLayerContents(nullContext, paintingInfo, paintFlags); Do you need to null check layerWeakPtr here? 1534999 7 koivisto 2019-05-10 08:45:18 -0700 > Do you need to null check layerWeakPtr here? Nah, weakptrs in this code are just for safety, the logic should guarantee they won't be null here. 1535000 8 369548 simon.fraser 2019-05-10 08:48:16 -0700 Comment on attachment 369548 patch View in context: https://bugs.webkit.org/attachment.cgi?id=369548&action=review >> Source/WebCore/rendering/RenderLayerBacking.cpp:1497 >> + layerWeakPtr->paintLayerContents(nullContext, paintingInfo, paintFlags); > > Do you need to null check layerWeakPtr here? No, we think that's a correctness bug and are OK with a null-deref crash. However, this code will be wrong when the sharing layers have transforms. Please file a follow-up bug to fix that. You'll need to use something like I'm adding in bug 197692. 1535019 9 369548 commit-queue 2019-05-10 09:20:18 -0700 Comment on attachment 369548 patch Clearing flags on attachment: 369548 Committed r245175: <https://trac.webkit.org/changeset/245175> 1535020 10 commit-queue 2019-05-10 09:20:20 -0700 All reviewed patches have been landed. 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