From: Jony Rosenne (rosennej@qsm.co.il)
Date: Sat Jun 11 2005 - 01:49:04 CDT
> -----Original Message-----
> From: unicode-bounce@unicode.org
> [mailto:unicode-bounce@unicode.org] On Behalf Of John Hudson
> Sent: Saturday, June 11, 2005 3:18 AM
> To: Kent Karlsson
> Cc: unicode@unicode.org
> Subject: Re: Arabic letters separated by markup
>
>
> Kent Karlsson wrote:
>
> > That does not really follow. I think "inline" tags *between*
> > Arabic/Syriac/
> > Mongolian letters (possibly with combining marks) can be
> seen as acting
> > like
> > ZERO-WIDTH JOINER for the purpose of
> Arabic/Syriac/Mongolian shaping.
> > Certain changes that the markup may result in, such as a
> size change,
> > will
> > make the join more or less "misfit" graphically. But
> whoever wrote the
> > markup
> > asked for a size change, not a joining change. Ligature
> formation should
> > (always) be blocked over markup tags.
>
> But if one letter is at 20pt and another is at 12pt, how can
> the form a ligature? or if
> one is bold and the other is italic? This is the sort of
> stylistic change that might be
> affected by inline markup. The kind of glyph processing
> lookups that control e.g. basic
> Arabic shaping, ligation, etc. are all font-specific. As soon
> as you change the font, you
> are dealing with completely separate runs of glyphs that will
> be independently shaped.
>
> It is just about possible to imagine that something like
> basic Arabic shaping *could* be
> maintained, in that the character level analysis performed an
> engine might recognise that
> one Arabic character is being followed by another Arabic
> character, so would not apply
> final form shaping. But it seems much more likely that the
> glyph run boundary will
> interpreted as a text boundary for shaping purposes. With
> ligatures, I don't see how it is
> possible at all to maintain shaping across run boundaries,
> since the ligature is a single
> glyph in a single font.
I think in this case either font should be used for the ligature, unless
there was a explicit ZWNJ.
Jony
>
> John Hudson
>
> --
>
> Tiro Typeworks www.tiro.com
> Vancouver, BC tiro@tiro.com
>
> Currently reading:
> Truth and tolerance, by Benedict XVI, Cardinal Ratzinger as was
> War (revised edition), by Gwynne Dyer
>
>
>
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