- From: Pierre-Anthony Lemieux <pal@sandflow.com>
- Date: Wed, 22 Jan 2014 13:51:59 -0800
- To: Nigel Megitt <nigel.megitt@bbc.co.uk>
- Cc: Timed Text Working Group <public-tt@w3.org>
> There's no proposal to backport them to TTML1so far Thanks for confirming. -- Pierre On Mon, Jan 20, 2014 at 12:38 AM, Nigel Megitt <nigel.megitt@bbc.co.uk> wrote: > Hi Pierre, > > The 125% wording we added to TTML1SE is informative only. I don't believe > that the proposed algorithm is contrary to that wording (and certainly not > to the intent) though it is more explicit about when the percentage rule > should apply and removes much of the ambiguity present previously. > > That said, these changes are planned for TTML2 only. There's no proposal > to backport them to TTML1so far, but if you or another member would like > to make one then that option's available. > > Kind regards, > > Nigel > > > On 17/01/2014 20:46, "Pierre-Anthony Lemieux" <pal@sandflow.com> wrote: > >>Hi Nigel, >> >>Is the plan to backport these changes to TTML 1.0? >> >>Thanks, >> >>-- Pierre >> >>On Fri, Jan 17, 2014 at 6:17 AM, Nigel Megitt <nigel.megitt@bbc.co.uk> >>wrote: >>> CONTEXT >>> >>> As discussed in yesterday's TTWG meeting, as part of the fulfilment of >>> actions 219 [1] and 221 [2] Glenn has edited the TTML2 editor's draft to >>> incorporate an algorithm for computing the value of line height, based >>>on >>> the code used by Mozilla, blink and webkit. This can additionally be >>> considered part of the solution to the line height problem which has >>>also >>> been raised in issues 275 [3] and 284 [4]. >>> >>> WHAT HAS CHANGED >>> >>> The algorithm can be found at [5] in section 8.2.13 tts:lineHeight. >>> >>> I won't attempt to repeat Glenn's explanation of this algorithm, which I >>> scribed as best I could yesterday, except to note what may appear at >>>first >>> to be a substantive change to some, that the "125% of fontSize" rule >>>does >>> not always apply, but applies only when the font is not associated with >>> "font metrics that specify altitude A, descent D, and line gap G". >>> >>> FOLLOW-UP >>> >>> This algorithm is absent from CSS but, if this group's members are happy >>> with it, we should communicate it to the CSS WG, to maximise the time >>>for >>> them to raise any potential issues, or indeed choose to adopt it into >>>their >>> own output documentation, which we could then potentially reference. >>> Formally they will report any problems anyway at Last Call stage but I'd >>> rather seek early agreement when possible. >>> >>> ACTION REQUIRED NOW >>> >>> Please notify the group if there are any queries or objections to this >>> algorithm as it stands. >>> >>> We noted in yesterday's call that it was not possible to verify that IE >>> adopts the same algorithm, so it would be particularly useful if someone >>> from Microsoft could confirm that they are happy with it Jerry, this >>> probably means you! >>> >>> Rather than making this an open-ended action I'll close this off and >>>state >>> that we have approval if there are no outstanding objections by the end >>>of >>> our next call on 30th Jan 2014. >>> >>> >>> >>> This email satisfies Action-260 [6]. >>> >>> >>> References >>> >>> [1] Action-219 https://www.w3.org/AudioVideo/TT/tracker/actions/219 >>> [2] Action-221 https://www.w3.org/AudioVideo/TT/tracker/actions/221 >>> [3] Issue-275 https://www.w3.org/AudioVideo/TT/tracker/issues/275 >>> [4] Issue-284 https://www.w3.org/AudioVideo/TT/tracker/issues/284 >>> [5] TTML2 Editor's draft, section on lineHeight >>> >>>https://dvcs.w3.org/hg/ttml/raw-file/default/ttml2/spec/ttml2.html#style- >>>attribute-lineHeight >>> [6] Action-260 https://www.w3.org/AudioVideo/TT/tracker/actions/260 >>> >>> >>> >>> ---------------------------- >>> >>> http://www.bbc.co.uk >>> This e-mail (and any attachments) is confidential and may contain >>>personal >>> views which are not the views of the BBC unless specifically stated. >>> If you have received it in error, please delete it from your system. >>> Do not use, copy or disclose the information in any way nor act in >>>reliance >>> on it and notify the sender immediately. >>> Please note that the BBC monitors e-mails sent or received. >>> Further communication will signify your consent to this. >>> >>> --------------------- > > > > ----------------------------- > http://www.bbc.co.uk > This e-mail (and any attachments) is confidential and > may contain personal views which are not the views of the BBC unless specifically stated. > If you have received it in > error, please delete it from your system. > Do not use, copy or disclose the > information in any way nor act in reliance on it and notify the sender > immediately. > Please note that the BBC monitors e-mails > sent or received. > Further communication will signify your consent to > this. > -----------------------------
Received on Wednesday, 22 January 2014 21:52:47 UTC