[Webkit-unassigned] [Bug 79021] New: Web font is not used in rendering for the first load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79021

           Summary: Web font is not used in rendering for the first load
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yuzo at google.com


The example in https://developers.google.com/webfonts/docs/webfont_loader#Example doesn't work as expected for
- WebKit r108205 + Safari 5.1.2 on OS X 10.6.8
- Chrome 19.0.1041.0 dev on OS X 10.6.8
That is, the text is rendered in the web fonts only if the page is reloaded.

Safari Version 5.1.2 (6534.52.7), Firefox 10.0.2, and Opera 11.61 work as expected.

Reproduction steps:

1. Clear the browse cache (Option+Command+E for Safari).
2. Open the attached webfontloader.html.
3. Observe that the text is rendered in local font.
4. Reload webfontloader.html.
5. Observe that the text is rendered in Web fonts.


I observed the following:

For the fist load, CSSFontSelector::getFontData is called *before* CSSFontSelector::addFontFaceRule.
For the second load, getFontData is called *after* addFontFaceRule.

HTMLLinkElement::setCSSStyleSheet is called from
CachedCSSStyleSheet::checkNotify for the first load, while from
CachedCSSStyleSheet::didAddClient for the second load.

I guess layout should be done after the stylesheet is loaded?

(This is likely related to http://code.google.com/p/chromium/issues/detail?id=114928 )

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