On 16/12/13 15:21, Bob Hallissy wrote:
Looking briefly at the GSUB lookups, I don't see the language-specific
lookups I'd expect. In the 1.x font, it looks like we handled this
within the 'calt' feature (which is a little odd - I'd have expected
it in 'locl' - but perhaps we had a good reason for it at the time, I
forget).
The good reason is that, at least at the time, MS shaper for Arabic
didn't process locl. And it still isn't listed as one of the features
supported by their shaper in
http://www.microsoft.com/typography/OpenTypeDev/arabic/intro.htm. Anyone
know differently?
OK, that makes sense. It occurred to me after I sent the message that
perhaps this was why we did it like that.
(Of course, even if they updated this in a new Windows version, you'd
need to handle the forms in another feature if you want it to work for
users on old OSes such as WinXP, where I doubt MS is pushing out many
usp10 updates.)
On this subject: I would have expected language-specific forms to work
with Graphite rendering since the language table therein appears to work
(at least it does with WorldPad -- admittedly using the old Graphite
engine):
The language tags in my testcase were wrong, sorry. Should be "ur" and
"sd" respectively. With those fixed, I get the expected lang-specific
forms in Firefox Nightly using Graphite.
JK
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