[Webkit-unassigned] [Bug 169944] New: If an image appears more than once on a page, decoding for painting one instance repaints them all

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169944

            Bug ID: 169944
           Summary: If an image appears more than once on a page, decoding
                    for painting one instance repaints them all
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

When frames are repainting for async decoding, we'll end up repainting every renderer that uses that image. That can cause repaints in tiles that would otherwise stay non-dirty, which is undesirable.

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