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Re: ligature formation across text chunks

From: Cameron McCormack <cam@mcc.id.au>
Date: Sat, 14 May 2011 10:34:44 +1200
To: Rik Cabanier <cabanier@adobe.com>
Cc: 'Alex Danilo' <alex@abbra.com>, Vincent Hardy <vhardy@adobe.com>, "public-svg-wg@w3.org" <public-svg-wg@w3.org>
Message-ID: <20110513223444.GB29083@wok.mcc.id.au>
Rik Cabanier:
> Adobe's apps leave it up to the designer if they want ligatures are
> not. It seems that SVG is in a mode to always create them which might
> not be the desired effect.

Ligatures specified in SVG Font do have to be used.  I don’t know that
the specification says anything about whether to use particular
ligatures from OpenType fonts.  I would want implementations to follow
whatever rules are defined for CSS3 font-variant.

> Many ligatures have Unicode representations. Maybe we should rely on
> those instead...

Do you mean: suggest to authors to use precomposed ligature characters
when using glyph positioning?

> If SVG wants to have robust Asian text support or support for
> discretionary ligature, the concept of glyph indices will be needed.

And not even for discretionary ligatures, but even whether ligatures
exist or not because of font selection.

I’m skeptical that glyph positioning can be useful in the fact of font
fallback and even whether discretionary ligatures are being used or not,
though.

-- 
Cameron McCormack ≝ http://mcc.id.au/
Received on Friday, 13 May 2011 22:35:23 GMT

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