[Webkit-unassigned] [Bug 198454] New: Optimize for negative z children on the root

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat Jun 1 10:55:22 PDT 2019


            Bug ID: 198454
           Summary: Optimize for negative z children on the root
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Created attachment 371114

  --> https://bugs.webkit.org/attachment.cgi?id=371114&action=review


It's pretty common to have negative z-index children in the root stacking context. Currently, we'll pop in to adding a foreground layer, which will become tiled and double our tiled backing store memory use.

We could, in some cases, use the page tiles for the foreground, and just have a solid color background behind the negative z-index child.

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