Re: [NTG-context] 'kern': TrueType table and GPOS lookup feature

2 Dec 2012

      And how many of them do it right? None, not even Pango, not even
Firefox, all are broken in some subtle ways. I'm not saying it is hard,
though, I'm saying it is complex.

Regards,
 Khaled

On Sun, Dec 02, 2012 at 03:32:49PM +0100, Steve White wrote:
...
Determinig the script from the text is not hard.
It has been done in many projects.
On Sun, Dec 2, 2012 at 2:12 PM, Khaled Hosny  wrote:
...
...
Hi all,
I finally got something like Pablo's test working on my system.  It
doesn't
show much new.  As had already been established, with the right ConTeXt
switches, OpenType features of kerning and ligatures work correctly with
FreeSerif.
Find attached.  If there's a better way to do this, please comment: I may
put some of this in the FreeFront usage notes.  (Hm... I may tighten the
italic y a bit.)
A question remains: Why does ConTeXt (like some other TeX derivatives
On Sun, Dec 02, 2012 at 10:58:56AM +0100, Steve White wrote:
that
...
use OpenType) not determine the OpenType script of runs of text from the
Unicode (or other encoding) character range?  All other font layout
systems
I know of do this.  (Remember- a run of text in the OpenType sense is not
the same as the scope of a TeX environment, it is typically a word,
separated by white space or punctuation.)
Determining the script of a run of text is not that simple, take
"english (ARABIC.)"; to which script should the parenthesis and the
period be classified? (they have a "common" script property in Unicode
and not assigned to any given script). Unicode annex #24 provides an
algorithm for to handle this that an engine should implement:
http://www.unicode.org/reports/tr24/
Regards,
 Khaled
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...
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