RE: [ttml2] embedded content, background image styling, other edits

Understood…

So by subsetted font you implicitly mean a font that is well formed in terms of its internal tables, not just a font that has been stripped of (unused) data to make it lightweight?

Best,
J

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From: Glenn Adams [mailto:glenn@skynav.com]
Sent: 26 November 2014 14:52
To: John Birch
Cc: public-tt@w3.org; tai@irt.de; nigel.megitt@bbc.co.uk
Subject: Re: [ttml2] embedded content, background image styling, other edits


On Wed, Nov 26, 2014 at 7:41 AM, John Birch <John.Birch@screensystems.tv<mailto:John.Birch@screensystems.tv>> wrote:
That note may also need to be referred to from the font-face section too?
It would seem that (except for ASCII / LATIN 1) as mentioned, the use of the Unicode ‘range’ element becomes almost mandatory when a resource is referenced internally?

Not really. The only use of family, style, weight, and range attributes on <font/> are to allow font selection processing to reject use of a font without actually having to access/load the font. Further, the range element, if specified would only indicate the character range supported by a subsetted font (if it were indeed subsetted).

In the absence of a range attribute (not element) the font selection algorithm *may* need to load the font resource and use the internal CMAP tables (or equivalent) to determine the effective range(s) of coverage. But if that font were later in the prioritized list of font candidates (for selection processing) then it may not even be accessed (or loaded) if a font earlier in that list satisfies the selection criteria.

So, the answer about whether range is useful or not: it depends.


Best,
John

John Birch | Strategic Partnerships Manager | Screen
Main Line : +44 1473 831700<tel:%2B44%201473%20831700> | Ext : 2208 | Direct Dial : +44 1473 834532<tel:%2B44%201473%20834532>
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Visit us at
BVE, Excel London 24-26 February 2015 Stand No. N19

P Before printing, think about the environment

From: Glenn Adams [mailto:glenn@skynav.com<mailto:glenn@skynav.com>]
Sent: 26 November 2014 14:37
To: John Birch
Cc: public-tt@w3.org<mailto:public-tt@w3.org>; tai@irt.de<mailto:tai@irt.de>; nigel.megitt@bbc.co.uk<mailto:nigel.megitt@bbc.co.uk>
Subject: Re: [ttml2] embedded content, background image styling, other edits


On Wed, Nov 26, 2014 at 7:30 AM, John Birch <John.Birch@screensystems.tv<mailto:John.Birch@screensystems.tv>> wrote:
Thanks! I'll follow up Nigel's proposal. As indicated, I don't view it as a strong requirement (for STL files)... Not sure about this concept for other large resources (like fonts)...

btw, for fonts, you should be using subsetted fonts, i.e., containing only glyphs for characters used in a document; with an ASCII or LATIN-1 only font, this won't make much difference, but for modern Unicode fonts covering multiple scripts or for CJK fonts, this makes a huge difference;

i will add a note in the section defining the font element reminding readers of this fact


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