[Webkit-unassigned] [Bug 191546] New: Can we avoid compositing overlap testing after page scroll?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191546

            Bug ID: 191546
           Summary: Can we avoid compositing overlap testing after page
                    scroll?
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

RenderLayerCpmpositor has:

    if (updateType == CompositingUpdateType::OnScroll || updateType == CompositingUpdateType::OnCompositedScroll) {
        // Scrolling can affect overlap. FIXME: avoid for page scrolling.
        updateRoot->setDescendantsNeedCompositingRequirementsTraversal();
    }

We already extend overlap rects for fixed and sticky layers, so we should be able to avoid any new overlap testing on page scroll.

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