[Webkit-unassigned] [Bug 233749] New: move shouldAutoActivateFontIfNeeded knownFamilies cache to FontCache

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233749

            Bug ID: 233749
           Summary: move shouldAutoActivateFontIfNeeded knownFamilies
                    cache to FontCache
           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: heycam at apple.com
                CC: bfulgham at webkit.org, mmaxfield at apple.com,
                    simon.fraser at apple.com, zalan at apple.com
            Blocks: 233488

With OffscreenCanvas, we can call shouldAutoActivateFontIfNeeded on a worker thread, and the knownFamilies HashSet is not thread safe. Also, the AtomStrings it stores are thread-specific. Move it to FontCache, so each thread has its own set.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=233488
[Bug 233488] make font code usable from multiple threads
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