[mpeg-OTspec] MS Proposal: 'svrt' feature

[Michelle Perham]

Behdad,
At this point we don’t have a full feature proposal put together, but it’s something we’re interested in doing, particularly if others in the community are supportive of the idea.

Michelle

From: mpeg-OTspec at yahoogroups.com [mailto:mpeg-OTspec at yahoogroups.com] On Behalf Of Behdad Esfahbod
Sent: Thursday, January 3, 2013 2:51 PM
To: Michelle Perham
Cc: opentype-migration-list at indx.co.uk; OTspec (mpeg-OTspec at yahoogroups.com); Dwayne Robinson
Subject: Re: [mpeg-OTspec] MS Proposal: 'svrt' feature



On 13-01-03 03:30 PM, Michelle Perham wrote:
>
>
> I have one last proposal to submit on behalf of Microsoft. This one was also
> put together by Dwayne Robinson. If people feel it’s worthwhile, we’ll need to
> draft the text as it would appear in the spec.
>
>
>
> Summary: Create a new feature tag to account for limitations in the ‘vert’ feature
>
>
>
> Details: The OpenType ‘vert’ feature adjusts the positioning and form of
> numerous upright glyphs in vertical text. However, there is no OpenType
> feature to adjust positioning and form of glyphs of other non-ideographic
> scripts in vertical text, such as Latin turned 90 degrees clockwise. This
> results in poor alignment of certain punctuation. Using ‘vert’ for these
> non-upright characters would be unwise because ‘vert’ substitutes glyph forms
> that are expected to be upright rather than turned, so this can result in
> /doubly/ turned glyphs like brackets and arrows (such as U+2192). Had ‘vert’
> only changed positioning and form, it could have been used for both, where
> higher level layout would have controlled character orientation via a standard
> like UTR 50. However, since ‘vert’ has historically conflated orientation into
> the substitution, I propose the distinct ‘svrt’ GSUB/GPOS tag for such usage -
> credit to Elika Etemad for the idea.

While in general I welcome this proposal, I think there needs to be clear
instructions on how this should interact with 'vert', 'vrt2', as well as
engine-level rotation. Do you have full feature proposal?

behdad

> Thanks!
>
>
>
> Michelle
>
> Microsoft Typography Group
>
>

--
behdad
http://behdad.org/

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