[Webkit-unassigned] [Bug 224426] New: Make FontFace parsing worker-safe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224426

            Bug ID: 224426
           Summary: Make FontFace parsing worker-safe
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clord at igalia.com
            Blocks: 224178

WorkerGlobalScope is a FontProvider and thus needs to provide a FontFace. Using FontFace in OffscreenCanvas in a Worker is tracked in bug 224178. Currently, FontFace uses parseString, but this ends up using CSSValuePool::singleton and possibly other things that aren't safe for use in a Worker.

Much like canvas/OffscreenCanvas now use CSSParser::parseFontWorkerSafe, we need safe parsers for the other font properties (which are all subsets of parseFont I believe, so this ought to be a relatively simple patch at least on the CSSParser-side) and for FontFace and CSSFontFace to use them. As a bonus, this also ought to be a (very) minor performance improvement.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=224178
[Bug 224178] Implement FontFace in Workers for OffscreenCanvas
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