[Webkit-unassigned] [Bug 203062] New: Does isLoadingCustomFonts() trigger many more layouts than is necessary?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203062

            Bug ID: 203062
           Summary: Does isLoadingCustomFonts() trigger many more layouts
                    than is necessary?
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: mmaxfield at apple.com

RendertStyles evaluate as non-equal if either has a FontCascade for which isLoadingCustomFonts() is true. That triggers extra work in determineChange(const RenderStyle& s1, const RenderStyle& s2), and causes RenderStyle::diff() to return StyleDifference::Layout which triggers layouts.

This happens on lot on real pages (greensock.com, nytimes.com). We should figure out if fixing this would give us a performance win.

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