Re: no liga with Brill font

[Hans Hagen <pragma@wxs.nl>]

On 7-2-2012 23:10, Khaled Hosny wrote:
> On Tue, Feb 07, 2012 at 10:20:55PM +0100, Pablo Rodríguez wrote:
>> Hi there,
>>
>> there is a zero-cost font (not available for commercial works without
>> previous permission) from Brill (http://www.brill.nl/news/brill-typeface).
>>
>> Standard ligatures such as fi and fl don't work:
>>
>> 	\usemodule[simplefonts]
>> 	\definefontfeature[default][default][script=latn]
>> 	\setmainfont[Brill]
>> 	\starttext
>> 	fi fl ff ffi ffl
>> 	\stoptext
>>
>> The glyphs are defined (ff, fi, fl, ffi, ffl), but when I test ligatures with
>> FontForge (Ctrl+K) these glyphs aren't used and single substitution
>> lookups in different subtables are performed for the different ligatures
>> (actually no ligatures are used).
>
> The font seems to be using contextual substitution instead of regular
> ligatures (so the ligature glyphs are not really used, but alternate f’s
> and i’s etc. are used instead to give the same effect, quite helpful if
> you want to color only part of the ligature), so you may node to set
> mode to node:
>
> \definefontfeature[default][default][script=latn,mode=node]
>
> However, your example works here without any modifications (I added
> color commands just to showcase the usefulness of this approach).
>
> \usemodule[simplefonts]
> \definefontfeature[default][default][script=latn]
> \setmainfont[Brill]
> \def\r#1{\color[red]{#1}}
> \def\b#1{\color[blue]{#1}}
> \starttext
> \r{f}\b{i} \r{f}\b{l} \b{f}\r{f} \b{f}f\r{i} \r{f}\b{f}\r{l}
> \stoptext

Here are two examples from an upcoming manual (about nasty font details 
... quite some work so far from ready)


\setupbodyfont[dejavu]

\starttext
     \showotfcomposition{name:dejavuserif*default at 24pt}{1}{affiliation}
     \page
     \showotfcomposition{name:cambria*default at 24pt}{1}{affiliation}
\stoptext

Dejavu has real ligatures but cambria has alternate glyphs.

Hans


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