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Re: WebVTT Horizontal writing direction

From: Philip Jägenstedt <philipj@opera.com>
Date: Tue, 10 Feb 2015 15:51:53 +0700
Message-ID: <CAMQvoCkcWa97SzvOO7ZxbjPZ160H1mG7jo_bBKm4HpUd4U+LwQ@mail.gmail.com>
To: Dae Kim <dakim@netflix.com>
Cc: Thierry MICHEL <tmichel@w3.org>, public-tt@w3.org, Silvia Pfeiffer <silviapfeiffer1@gmail.com>
That's a good question, Dae.

This will end up doing the same as when mixing &rlm; with vertical
text in CS. I don't know what that something is, but hope it's well
defined :)

Philip

On Fri, Feb 6, 2015 at 7:05 AM, Dae Kim <dakim@netflix.com> wrote:
> Related questions:
>
> What is the expected behavior when &rlm; is applied to vertical:rl or
> vertical:lr text?
> The BiDi spec defers to "higher-level protocols".
>
> When text is written horizontally, it rests along a horizontal baseline
> (whether it's English alphabet or Japanese characters).
> When applying a vertical writing direction, should the text remain along a
> horizontal baseline or should it rotate 90 degrees to rest on a vertical
> baseline?
> Is the expected behavior consistent whether it's English alphabet or
> Japanese characters?
>
>
> -Dae
>
> Dae Kim | Video Engineer | Encoding Technology
> 9420 94f4 a834 b038 2920 34b3 38ad b632 3738 942c 942f
>
> On Wed, Feb 4, 2015 at 7:11 PM, Philip Jägenstedt <philipj@opera.com> wrote:
>>
>> To get RTL you simply use a cue text which is RTL according to the
>> BiDi algorithm, and you can use &lrm; and &rlm; to where necessary in
>> mixed-directionality text.
>>
>> Note, however, that the equivalent to vertical:rl for horizontal text
>> would be control over which direction additional lines of texts grow,
>> up or down. We don't have explicit control over that, even though the
>> cue placement algorithm does move whole cues up or down.
>>
>> Philip
>>
>> On Wed, Feb 4, 2015 at 11:39 PM, Thierry MICHEL <tmichel@w3.org> wrote:
>> > Hi,
>> >
>> > WebVTT lastest draft [1]
>> > http://www.w3.org/TR/2014/WD-webvtt1-20141113/
>> > specifies the WebVTT vertical text cue setting
>> >
>> > A WebVTT vertical text cue setting configures the cue to use vertical
>> > text
>> > layout rather than horizontal text layout. Vertical text layout is
>> > sometimes
>> > used in Japanese, for example. The default is horizontal layout.
>> >
>> > vertical values:
>> > - vertical:rl   writing direction is right to left
>> > - vertical:lr   writing direction is left to right
>> >
>> >
>> > My issue is how can one set writing direction  "right to left" for
>> > horizontal text ? (example of arabic lang)
>> > I couldn't find explicit mention in the spec.
>> > like:
>> > - horizontal:rl         writing direction is right to left
>> > - horizontal:lr         writing direction is left to right
>> >
>> >
>> > Thierry
>> >
>> >  [1] http://www.w3.org/TR/2014/WD-webvtt1-20141113/
>> >
>>
>
Received on Tuesday, 10 February 2015 08:52:21 UTC

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