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ISSUE-374: Generalize tts:fontVariantPosition [TTML2]

From: Timed Text Working Group Issue Tracker <sysbot+tracker@w3.org>
Date: Mon, 23 Feb 2015 06:55:47 +0000
To: public-tt@w3.org
Message-Id: <E1YPmvj-000DnH-Tw@deneb.w3.org>
ISSUE-374: Generalize tts:fontVariantPosition [TTML2]

http://www.w3.org/AudioVideo/TT/tracker/issues/374

Raised by: Glenn Adams
On product: TTML2

In order to support Japanese (and other CJK) usage, it is useful to support selection of other axes of glyph variation besides position (super/sub). In particular, selection of full width and half width variants, as supported by the OpenType 'fwid' and 'hwid' features, as well as ruby variants, is useful. To this end, the tts:fontVariantPosition property should be renamed to tts:fontVariant, and its values enhanced to specify, at a minimum:

* super vs sub (script) forms
* full vs half width forms
* ruby forms

Specifically, propose the value of the generalized property to adhere to the following:

tts:fontVariant
  : normal
  | [ super | sub ] || [ full | half ] || ruby

When super or sub is specified, then the 'sups' or 'subs' OpenType feature is enabled. When full or half is specified, then the 'fwid' or 'hwid' OpenType feature is enabled. When ruby is specified, then the 'ruby' OpenType feature is enabled.
Received on Monday, 23 February 2015 06:55:48 UTC

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