Re: 'kern': TrueType table and GPOS lookup feature

[Khaled Hosny <khaledhosny@eglug.org>]

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 <khaledhosny@eglug.org> wrote:
> 
> > On Sun, Dec 02, 2012 at 10:58:56AM +0100, Steve White 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
> > 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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