\doiffontfeature

\doiffontfeature

[Wolfgang Schuster]

Hi,

is it possible to check if a font has a certain feature like smallcaps?

Wolfgang

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Re: \doiffontfeature

[Hans Hagen]

Wolfgang Schuster wrote:
> Hi,
> 
> is it possible to check if a font has a certain feature like smallcaps?

\startluacode
     function commands.doifelsecurrentfonthasfeature(name)
         local f = fonts.ids[font.current()]
         f = f and f.shared
         f = f and f.otfdata
         f = f and f.luatex
         f = f and f.features
         commands.doifelse(f and (f.gpos[name] or f.gsub[name]))
     end
\stopluacode

\def\doifelsecurrentfonthasfeature#1%
   {\ctxlua{commands.doifelsecurrentfonthasfeature("#1")}}

\doifelsecurrentfonthasfeature{smcp}{YES}{NO}
\doifelsecurrentfonthasfeature{crap}{YES}{NO}
\doifelsecurrentfonthasfeature{kern}{YES}{NO}

for arbitrary fonts by names is doable but tricky in the sense that we 
then need to load the font which is costly

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If your question is of interest to others as well, please add an entry to the Wiki!

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Re: \doiffontfeature

[Wolfgang Schuster]

Am 07.05.2009 um 15:01 schrieb Hans Hagen:

> Wolfgang Schuster wrote:
>> Hi,
>> is it possible to check if a font has a certain feature like  
>> smallcaps?
>
> \startluacode
>    function commands.doifelsecurrentfonthasfeature(name)
>        local f = fonts.ids[font.current()]
>        f = f and f.shared
>        f = f and f.otfdata
>        f = f and f.luatex
>        f = f and f.features
>        commands.doifelse(f and (f.gpos[name] or f.gsub[name]))
>    end
> \stopluacode
>
> \def\doifelsecurrentfonthasfeature#1%
>  {\ctxlua{commands.doifelsecurrentfonthasfeature("#1")}}
>
> \doifelsecurrentfonthasfeature{smcp}{YES}{NO}
> \doifelsecurrentfonthasfeature{crap}{YES}{NO}
> \doifelsecurrentfonthasfeature{kern}{YES}{NO}

Nice, I will keep this in mind.

> for arbitrary fonts by names is doable but tricky in the sense that  
> we then need to load the font which is costly

Can you show me the code, this is what I'm interested in and the check
did only happen once at the begin of the document.

Wolfgang

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If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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