Re: Re: Arabic support

We have made similar observations with what might be double reordering 
(or no reordering) on a Windows system. I expect we will report more 
details tomorrow.

Regards,    Martin.

On 2010/09/01 11:17, Kenichi Handa wrote:
> In article<[email protected]>, Eli Zaretskii<[email protected]>  writes:
>
>>> In Emacs, bidi reordering is done by Emacs itself, so the `shape'
>>> method of font backend should not reorder glyphs.  But, perhaps
>>> Uniscribe backend reorders Arabic text, right?
>
>> No, not AFAIK.  We call the ScriptItemize API of Uniscribe with NULL
>> as the 4th and 5th arguments, which AFAIU should disable reordering.
>> Perhaps Jason could chime in and tell if I'm right here.
>
> 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?


-- 
#-# Martin J. Dürst, Professor, Aoyama Gakuin University
#-# http://www.sw.it.aoyama.ac.jp   mailto:[email protected]