Re: Making necessary OpenType features on by default

[Hans Hagen <pragma@wxs.nl>]

Idris Samawi Hamid ادريس سماوي حامد wrote:
> On Fri, 20 Feb 2009 11:39:23 -0700, Khaled Hosny <khaledhosny@eglug.org> 
> wrote:
> 
>> Microsoft's OpenType features list page
>> (http://www.microsoft.com/typography/otspec/features_ae.htm) gives a "UI
>> suggestion" for each feature noting if it should be on by default,
> 
> Hmm, I think this page is more relevant for what you have in mine:
> 
> http://www.microsoft.com/typography/otfntdev/arabicot/features.htm
> 
> :-)

watch the "The standard order for applying Arabic features encoded in 
OpenType fonts" ... an earlier mkiv otf handler did this but then we 
found out that it violates the otf 'any order possible' rule so now we 
do just the order as we encounter it (and even then it took us a while 
to figure out where/how to avoid interferences); so ... it's up to the 
font designer (or technician)

now, having init, medi, fina, isol, rlig enabled might be the default, 
but for instance arabtype output looks much better when instead of rlig 
we use calt/clig etc so, in that case the defaults would bot be the best 
choice; again an argument for a database approach

there are even fonts out there that have the right gsub/gpos info but 
lack the feature being listed in the script/lang dictionary which is 
complicating live even more; maybe we should assume that the renderers 
of ms and adobe have some additional built in heuristics of using 
specific fonts

Hans



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