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<p>I would characterize it as almost entirely a data efficiency
measure; it just reduces file size. Similarly with dmap. dmap
probably slightly increases the amount of processing involved.
Multiple overlapping GSUBs won't change the processing time but
the design assumes one is already starting with a single cmap and
substituting in GSUB, which will take slightly more time than
starting with per-language/region cmaps. <br>
</p>
<p>I think the assumption here is that all such processing is
dwarfed by, e.g., glyph rendering costs, so reducing file size
relative to it is a virtue.</p>
<p>Skef<br>
</p>
<div class="moz-cite-prefix">On 12/27/23 08:55, John Hudson wrote:<br>
</div>
<br>
<blockquote type="cite"
cite="mid:97e5bffd-39b0-48e4-82e5-0e2268c3b326@tiro.ca">
<p>We already make some TTCs with distinct cmap tables, and some
with distinct GSUB tables, so if I understand your proposal
correctly it is, like Peter’s DMAP proposal,<b> a data and
processing efficiency measure, correct</b>? A mechanism that
does this at the initial character-to-glyph mapping would seem
to provide more robust language-specific support.<br>
</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" moz-do-not-send="true">www.tiro.com</a>
Tiro Typeworks is physically located on islands
in the Salish Sea, on the traditional territory
of the Snuneymuxw and Penelakut First Nations.
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