[Webkit-unassigned] [Bug 100446] New: local(Helvetica) in src descriptor prevent fallback

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100446

           Summary: local(Helvetica) in src descriptor prevent fallback
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bashi at chromium.org


Created an attachment (id=170791)
 --> (https://bugs.webkit.org/attachment.cgi?id=170791&action=review)
test case

Test case attached.

WebKit doesn't fallback src descriptor of @font-face when the src descriptor contain "local(Helvetica)" even if a machine doesn't have Helvetica font. Instead, WebKit uses Arial font to render text.

The following code causes the issue (in FontCache.cpp):

static const AtomicString& alternateFamilyName(const AtomicString& familyName)
{
    ...
    // Alias Arial and Helvetica
    DEFINE_STATIC_LOCAL(AtomicString, arial, ("Arial"));
    DEFINE_STATIC_LOCAL(AtomicString, helvetica, ("Helvetica"));
    if (equalIgnoringCase(familyName, arial))
        return helvetica;
    if (equalIgnoringCase(familyName, helvetica))
        return arial;
    ...
}

Helvetica is replaced with Arial when Helvetica isn't on the machine. Since most machines have Arial, the text will be rendered with Arial. This behavior prevents page authors to use their Helvetica fonts as webfonts.

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