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Re: [css3-fonts] low-level font features

From: John Hudson <tiro@tiro.com>
Date: Tue, 22 Jun 2010 20:46:28 -0700
Message-ID: <4C218394.5030403@tiro.com>
To: John Daggett <jdaggett@mozilla.com>
CC: Jonathan Kew <jonathan@jfkew.plus.com>, www-font <www-font@w3.org>, Bram Pitoyo <brampitoyo@gmail.com>, "Levantovsky, Vladimir" <Vladimir.Levantovsky@MonotypeImaging.com>
John Daggett wrote:

> I think what you mean here is that the in OpenType Layout the
> knowledge of how to do standard text shaping is embedded in the layout
> engine, not in the font data itself, as is the case with AAT or
> Graphite.  My guess is AAT and Graphite layout engines are quite
> intelligent. ;)

Yes, that is what I meant.

I suppose state engines are intelligent in a sense, but they don't carry 
knowledge.

>> I'm guessing that layout engines encountering unregistered features,
>> if they do anything with them at all, will process them after
>> registered features, but to my knowledge there is no standard
>> protocol regarding this.

> Is this something that we should ask the OpenType folks to clarify in
> a future spec revision?  Including this in a CSS spec doesn't feel
> right although it would be expedient.

Yes, I think the OT/OFF specs or related documentation would would be 
the place for this.

[Adding Vlad, in his role as OFF chair.]

JH
Received on Wednesday, 23 June 2010 03:47:12 UTC

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