[webkit-dev] Adding CSS3 font feature propreties

Kenichi Ishibashi (石橋 賢一) bashi at google.com
Wed Jun 29 03:28:51 PDT 2011


On Wed, Jun 29, 2011 at 7:18 PM, TAMURA, Kent <tkent at chromium.org> wrote:

> Do you have a master bug for them?

Not yet, but I'll make a master bug for them when I don't see a strong

> On Fri, Jun 24, 2011 at 12:16, Kenichi Ishibashi <bashi at chromium.org>wrote:
>> Hi webkit-dev,
>> I'm thinking about adding CSS3 font feature properties[1] support to
>> WebKit.  It allows page authors to control over advanced typographic
>> features.  Firefox has an experimental implementation and an article[2]
>> shows how these properties work.  I really would like to add this feature so
>> I'd like to ask comments and suggestions in advance.
>> My current plan is starting with adding the font-feature-settings property
>> (6.12 Low-level font setting control) as -webkit-font-feature-settings,
>> following a similar approach that Firefox did.  For OpenType fonts, other
>> properties can be treated as specific cases of the font-feature-settings
>> property and I think adding this property is good starting point.
>> One shortcomings of this approach is that it requires OpenType support for
>> each port.  A port which uses AAT might not be able to support this
>> property, or we need to add an extra text rendering subsystem which can
>> handle OpenType features to the port.
>> If I get started with this plan, I will start implementing css parsing
>> part, then implement font rendering part on a specific port (Chromium Linux
>> port is in mind for now) on trial.
>> I'd also like to put some notes of supporting CSS3 font feature properties
>> with AAT and CoreText here:
>> - AAT features are listed at [3].
>> - While the spec lists the equivalent OpenType feature tag for each
>> property, it is unclear that what AAT feature setting corresponds with each
>> property.  An email written by the spec editor[4] lists them partially but
>> not complehensive.
>> - [5] describes OpenType support of CoreText (I'm not sure this is
>> correct, though).
>> Comments and suggestions are highly appreciated.
>> [1] http://dev.w3.org/csswg/css3-fonts/#font-rend-props
>> [2] http://hacks.mozilla.org/2010/11/firefox-4-font-feature-support/
>> [3] http://developer.apple.com/fonts/registry/
>> [4] http://lists.w3.org/Archives/Public/www-style/2009Jun/0506.html
>> [5] http://en.wikipedia.org/wiki/OpenType_feature_tag_list
>> Regards,
>> _______________________________________________
>> webkit-dev mailing list
>> webkit-dev at lists.webkit.org
>> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
> --
> Software Engineer, Google

Kenichi Ishibashi
bashi at google.com
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