Re: Arabic support

[Eli Zaretskii]

> From: Kenichi Handa <address@hidden>
> Cc: address@hidden, address@hidden, address@hidden
> Date: Wed, 01 Sep 2010 11:17:03 +0900
> 
> I read the function uniscribe_shape roughly.  It has this
> code:
> 
>   for (i = 0; i < nitems; i++)
>     {
>       int nglyphs, nchars_in_run, rtl = items[i].a.fRTL ? -1 : 1;
> [...]
>           if (SUCCEEDED (result))
>           {
>             int j, nclusters, from, to;
> 
>             from = rtl > 0 ? 0 : nchars_in_run - 1;
> 
> Doesn't it mean uniscribe_shape reorders glyphs?

This reorders a single LGSTRING, according to my reading.  Isn't an
LGSTRING a single grapheme cluster, rather than several distinct
characters?

Btw, where's the documentation of LGSTRING?  The commentary to
uniscribe_shape says to look in font-make-gstring, but I cannot find
that, neither as function nor as variable.  In general, everything
about compositions and lgstrings needs a lot more of documentation.