[Webkit-unassigned] [Bug 258758] New: Restore Path cheap copying (refcount/COR PathStream)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258758

            Bug ID: 258758
           Summary: Restore Path cheap copying (refcount/COR PathStream)
           Product: WebKit
           Version: WebKit Local 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

After 265569 at main, copying a Path with a PathStream impl results in cloning the PathStream, which might be large. This breaks the assumption of most of the existing code, that copying a Path is cheap because it's just refCounting a CGPathRef.

So we should restore cheap copy, and make the PathStream copy-on-write.

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