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<div class="moz-cite-prefix">On 16092020 2:50 pm, Peter Constable
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:MWHPR1301MB2112075934DAB5D46F69BBA286210@MWHPR1301MB2112.namprd13.prod.outlook.com">
<p class="MsoNormal">Since Adobe had registered this feature, I
asked them to investigate and come up with a recommendation.
Sairus has just provided Adobe’s recommendation in the issue
discussion:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p>“<span
style="font-size:10.5pt;font-family:"Segoe
UI",sans-serif;color:#24292E;background:white">Adobe
would like ‘opbd’ and its minions ‘lfbd’ & ‘rtbd’ to be
marked as deprecated in the features registry.</span>”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p>I’d like to hear from others if
they would support or, at least, have no objection to these
being marked as deprecated.</p>
</blockquote>
<p>I am 100% okay with opbd being deprecated.</p>
<p>The individual lfbd and rtbd features are, however, potentially
useful without opbd if rewritten and, indeed, could constitute
part of a model that might also involve tpbd (top) and (btbd)
bottom optical bounds features for vertical text. The error of the
original feature registration was the idea that a single feature
was needed to be able to apply the others, as a kind of gateway
between application function and the individual features and their
lookups. The idea of using GPOS to define margin alignment isn't a
terrible one in itself, especially for some scripts and styles
that are not well served by algorithmic margin alignment such as
currently available in InDesign.</p>
<p>That said, implementation of GPOS optical margin alignment, in
both fonts and applications, requires some significant work, which
I'm not holding my breath awaiting. I would rather, however,
consider these features potential or pending, rather than
deprecated. It would be silly to formally deprecate them and then
decide down the road that we'd actually like to use them.</p>
<p>JH<br>
</p>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
John Hudson
Tiro Typeworks Ltd <a class="moz-txt-link-abbreviated" href="http://www.tiro.com">www.tiro.com</a>
Salish Sea, BC <a class="moz-txt-link-abbreviated" href="mailto:tiro@tiro.com">tiro@tiro.com</a>
NOTE: In the interests of productivity, I am currently
dealing with email on only two days per week, usually
Monday and Thursday unless this schedule is disrupted
by travel. If you need to contact me urgently, please
use some other method of communication. Thank you.</pre>
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