[Webkit-unassigned] [Bug 199736] New: Be more robust regarding dot-prefixed fonts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199736

            Bug ID: 199736
           Summary: Be more robust regarding dot-prefixed fonts
           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: mmaxfield at apple.com
                CC: mmaxfield at apple.com

https://bugs.webkit.org/show_bug.cgi?id=199653 happened because we encountered a system font that we didn't expect. The solution for that bug in particular was to start expecting that font. However, in the future we shouldn't completely fall over in that case. We should try to be more robust.

I think what this will actually entail, as far as code, is for all fonts that SystemFontDatabaseCoreText creates (and eventually end up in a FontFamilySpecificationCoreText) to be marked somehow as "This is a variable font where the instance has already been chosen". Then, in preparePlatformFont(), when we apply the weight/width/slope variations, we can skip that section on the marked fonts. Right now we do that check by asking "fontIsSystemFont(originalFont)" but instead we can use that mark. This still wouldn't be perfect, but it would probably as close as we could get without adding explicit support for each dot-prefixed font.

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