commit | 9e7e1bd19fecd541ce4192e24039b746a88ce3df | [log] [tgz] |
---|---|---|
author | Xianzhu Wang <wangxianzhu@chromium.org> | Tue Apr 23 21:28:51 2024 |
committer | Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> | Tue Apr 23 21:44:59 2024 |
tree | a124393586b2edb4ac42b0b05ecff691d8c0a22f | |
parent | 43ae6cd615fad8cd6df2cade33ad48bfb9f285cb [diff] |
Fall back to main thread if scroll hit test is affected by rounded corners We had two issues: 1. Before we had fast rounded corners, we always created mask layers for rounded corner clips, and the mask layer made the scroll begin unreliable and fall back to the main thread. With fast rounded corners, the scrolls were treated as reliable without checking if the point is in or out of the rounded corners. 2. If the scroller has a rounded corner by itself (instead of from an ancestor), as we only create InnerBorderRadiusClip for the contents, the compositor doesn't actually know which part of the layer bounds is transparent to hit test (e.g. if the scroller has a border which is outside of the InnerBorderRadiusClip). Now with HitTestOpaqueness, such layers have HitTestOpaqueness::kMixed. This CL changes the behavior of LayerTreeImpl::FindLayersUpToFirstOpaqueToHitTest (renamed from FindLayerUpToFirstScrollableOrOpaqueToHitTest): - For issue #1: LayerImpl::OpaqueToHitTest() also checks whether the layer is affected by any fast rounded corners; - For issue #2: FindLayerUpToFirstOpaqueToHitTest checks only OpaqueToHitTest() (without checking IsScrollerOrScrollbar()) because a hit test on a scrollable layer is reliable only if it's opaque to hit test. Bug: 40277896 Change-Id: I1acb16f2c6790760661e8239ea1599035f83ea51 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5466909 Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org> Reviewed-by: Steve Kobes <skobes@chromium.org> Cr-Commit-Position: refs/heads/main@{#1291538}
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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