[Webkit-unassigned] [Bug 241935] New: Don't allocate backing stores for non-animated compositing layers with zero opacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241935

            Bug ID: 241935
           Summary: Don't allocate backing stores for non-animated
                    compositing layers with zero opacity
           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,
                    zalan at apple.com

We currently allocate (and paint) a backing store for opacity:0 layers, so that we can initiate animations faster.

Unfortunately this uses a lot of memory, so we're going to try skipping this, and allocating/painting on demand when an animation is started.

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