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

[Hans Hagen <pragma@wxs.nl>]

On 11/30/2012 10:25 PM, Steve White wrote:
> Luigi,
>
> OK, I get it. (I have wasted a couple of hours, it seems.)
>
> I'll do as you first recommeded.

When you have a working context, you can also try the update process: 
just run the first-setup script again and it will sync. Normally the 
minimals are synced every 30 minutes (or nowadays maybe 15). Keep in 
mind that these days Mojca is moving the whole setup to a new server.

I've uploaded a beta that supports this:

\starttext

\enabletrackers[visualizers.fontkern]
\setupscripts[features=auto]
\definedfont[freeserif*default]

\language[en]Whereas recognition of the inherent dignity and of the 
equal and inalienable
rights of all members of the human family is the foundation of freedom, 
justice
and peace in the world.

\language[gr]Επειδή η αναγνώριση της αξιοπρέπειας, που είναι σύμφυτη σε 
όλα τα μέλη της ανθρώπινης
οικογένειας, καθώς και των ίσων και αναπαλλοτρίωτων δικαιωμάτων τους 
αποτελεί
το θεμέλιο της ελευθερίας, της δικαιοσύνης και της ειρήνης στον κόσμο.

\language[en]Whereas disregard and contempt for human rights have 
resulted in barbarous acts
which have outraged the conscience of mankind, and the advent of a world 
in which
human beings shall enjoy freedom of speech and belief and freedom from 
fear and
want has been proclaimed as the highest aspiration of the common people.

\language[gr]Επειδή η παραγνώριση και η περιφρόνηση των δικαιωμάτων του 
ανθρώπου οδήγησαν σε
πράξεις βαρβαρότητας, που εξεγείρουν την ανθρώπινη συνείδηση, και η 
προοπτική ενός
κόσμου όπου οι άνθρωποι θα είναι ελεύθεροι να μιλούν και να πιστεύουν, 
λυτρωμένοι από
τον τρόμο και την αθλιότητα, έχει διακηρυχθεί ως η πιο υψηλή επιδίωξη 
του ανθρώπου.

\stoptext

Here

   \enabletrackers[visualizers.fontkern]

is actually the official way to trigger the kern tracker (we keep some 
\commands around for old times sake) as it's part of more visual 
debugging features.

   \setupscripts[features=auto]

This one is new and will do an analysis pass and set triggers for the so 
called dynamic feature handler (already present, so it was not that much 
work). One has to explicitly enable this trick and one can never depend 
on such things. Contrary to other tricks it does not obey grouping 
(could be done but adds overhead.)

   \definedfont[freeserif*default]

This triggers the font. One can comment the \setupscripts line to see 
kerns go away.

I only defined latn and grek:

\definefontfeature[latn][script=latn]
\definefontfeature[grek][script=grek]

so it uses the regular feature definition mechanism. If this is 
considered useful we can add more and also think about a namespace (i.e. 
several predefined setups). In that case I will add the code that obeys 
grouping. But in order to do that we need tests and that's up to users.

Hans

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                                           Hans Hagen | PRAGMA ADE
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