Bug 64747 – Specify a cascade list consisting of the last resort font for Core Text

• Component: Text
• Status: RESOLVED FIXED

Specify a cascade list consisting of the last resort font for Core Text

This would prevent Core Text from uselessly going through its longer default cascade list. WebKit never uses the results of Core Text’s fallback logic anyway.

Created attachment 101199 [details]
Patch

Committed r91209. <http://trac.webkit.org/r91209>

[Darin Adler]

Comment on attachment 101199 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=101199&action=review

> Source/WebCore/platform/graphics/cocoa/FontPlatformDataCocoa.mm:183
> +static CTFontDescriptorRef cascadeToLastResortFontDescriptor()
> +{
> +    static CTFontDescriptorRef descriptor;
> +    if (descriptor)
> +        return descriptor;

I like writing the two-function form of this sort of thing rather than the early return version.

> Source/WebCore/platform/graphics/cocoa/FontPlatformDataCocoa.mm:198
> +    if (m_CTFont)
>          return m_CTFont.get();

Same comment here.

[Ryosuke Niwa]

The following tests started failing on Chromium Mac 10.5 after this patch was landed:
fast/blockflow/broken-ideograph-small-caps.html
fast/blockflow/broken-ideographic-font.html
fast/css/custom-font-xheight.html

In particular, fast/css/custom-font-xheight.html is also failing on Mac Leopard as well:
http://build.webkit.org/results/Leopard%20Intel%20Release%20(Tests)/r91215%20(34147)/results.html

[Ryosuke Niwa]

Created attachment 101230 [details]
actual result for broken-ideograph-small-caps on Chromium Mac 10.5

Looking at the actual result for broken-ideograph-small-caps, something is going wrong here.

[Ryosuke Niwa]

The blame list is http://trac.webkit.org/log/trunk/?rev=91211&stop_rev=91204&limit=100&verbose=on

but http://trac.webkit.org/changeset/91205 is only applicable to plugin according to jamesr.

I will build on Leopard and see if I can reproduce any of the failures.