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Re: Change Proposal 21 review

From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Wed, 28 Jan 2015 18:38:12 -0800
Message-ID: <CAF_7JxAbqnv6nxo-fmk617tN34U-wkZEfsDOUcuhPoF2R8e35A@mail.gmail.com>
To: Glenn Adams <glenn@skynav.com>
Cc: "public-tt@w3.org" <public-tt@w3.org>
Hi Glenn et al.,

Thanks for the additional details.

> elaborated handling of potential overflow of line area [1]

As far as I can tell this is substantially different than the HGroup
feature in ST 428-7. Specifically, the horizontal text in ST 428-7 is
not "combin[ed] into an em square of the surrounding vertical text,"
but rather set horizontally with a font size selected by the author.

> [2] http://www.w3.org/AudioVideo/TT/tracker/issues/231
> [...]
> the described liaison cites as a use case the handling of
> horizontal text in a vertical writing mode context

The liaison (Section 6.11 of ST 428-7) does not contain this
limitation, but merely notes that "this is most commonly used to
present special characters in a text string that is being displayed
vertically."

I recommend TTWG ultimately communicates to SMPTE its disposition on
these requests.

Best,

-- Pierre

On Sun, Jan 25, 2015 at 1:01 PM, Glenn Adams <glenn@skynav.com> wrote:
>
>
> On Wed, Jan 21, 2015 at 11:45 PM, Pierre-Anthony Lemieux <pal@sandflow.com>
> wrote:
>>
>> Below is my input on Change Proposal 21 [1] per  AI #365 [2].
>>
>> - ISSUE-229. The SMPTE liaison [3] shows an example where the width of
>> the horizontal character group is larger than the width of the
>> bounding box of the associated vertical characters. Under
>> "tts:textCombine" (as referenced in ISSUE-219), the latest ED [4]
>> states that "the tts:textCombine attribute is used to specify a style
>> property that determines whether and how multiple nominally
>> non-combining characters are combined so that their glyph areas
>> consume the nominal bounding box of a single em square." Is the ED
>> consistent with the SMPTE liaison?
>
>
> elaborated handling of potential overflow of line area [1]
>
> [1] https://dvcs.w3.org/hg/ttml/rev/46a91ba16236
>
>>
>>
>> - ISSUE-231. Did the editor respond to the last question on the issue?
>
>
> just responded [2]
>
> [2] http://www.w3.org/AudioVideo/TT/tracker/issues/231
>
>>
>>
>> Looks good to me otherwise.
>>
>> Best,
>>
>> -- Pierre
>>
>> [1] https://www.w3.org/wiki/TTML/changeProposal021
>> [2] https://www.w3.org/AudioVideo/TT/tracker/actions/365
>> [3] https://lists.w3.org/Archives/Member/w3c-archive/2012Sep/0214.html
>> [4]
>> https://dvcs.w3.org/hg/ttml/raw-file/tip/ttml2/spec/ttml2.html#style-attribute-textCombine
>>
>
Received on Thursday, 29 January 2015 02:39:03 UTC

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