[Webkit-unassigned] [Bug 268116] New: Avoid compositing layers for opacity:0 subtrees

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=268116

            Bug ID: 268116
           Summary: Avoid compositing layers for opacity:0 subtrees
           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: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

Creating compositing layers takes time, and also prevents backing store sharing from working when it otherwise could.

We should be able to skip these while opacity is 0.

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