On Mon, Sep 10, 2012 at 07:36:19PM +0100, Jonathan Kew wrote: > On 2/9/12 05:07, Khaled Hosny wrote: > >On Sat, Sep 01, 2012 at 06:40:40PM -0400, Behdad Esfahbod wrote: > >>On 08/26/2012 07:15 PM, Khaled Hosny wrote: > >>>Hi Behdad, > >>> > >>>I just noticed that hamza above and below marks (U+0654, U+0655), are > >>>reordered after Arabic vowel marks because they have much higher > >>>combining classes, 230 and 222 (the "generic" combining class above and > >>>below, respectively), which breaks mkmk positioning. > >>> > >>>I tried to make a patch to handle them like the shadda, but I'm not sure > >>>how safe it is with such generic combining classes. > >> > >>Khaled, > >> > >>Given that there's a few handfuls of Arabic marks with 220/230 ccc, can you > >>help me figure out what the expected behavior is, in respect to the main > >>marks > >>and shadda? I can try to implement that after. > > > >Ideally, I think hamza and madda should come first, then shadda, then > >the vowel marks then everything else: > > > >* hamzat and maddat: U+0653-U+0655, U+065F, U+0674, U+06E4 > >* shadda: U+0651 > >* vowel marks: U+064B-U+0650, U+0652, U+0656-U+065E, U+08F0-U+08F2 > > > > The ordering of madda and vowel marks was raised on the Unicode list > in July 2011, and at that point the responses indicated that madda > should *follow* vowel marks; see > http://www.unicode.org/mail-arch/unicode-ml/y2011-m07/0143.html and > its replies.
Even without reading the replies, this makes perfect sense (fr Quranic usage at least, ordinary Arabic use of madda wouldn't combine it with vowel marks anyway). Regards, Khaled _______________________________________________ HarfBuzz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
