[NTG-context] tlig feature sometimes does not work

Mohammad Hossein Bateni bateni at gmail.com
Sat Mar 13 01:11:40 CET 2021


That's bad.  It seems, I forgot to add the fallbacks properly.  I will
reach out to the designer to add those chars.

On Fri, Mar 12, 2021 at 12:32 PM Hans Hagen <j.hagen at xs4all.nl> wrote:

> On 3/11/2021 2:05 AM, Mohammad Hossein Bateni wrote:
> > Hi,
> >
> > Since most fonts do not have the standard tex ligatures built in, I tend
> > to add them when I load the fonts.  Once in a while, I run into fonts
> > where this does not work.
> >
> > See the attached tex/pdf files.  I basically load the font as follows:
> >
> > \definefontfeature[tf][arabic][tlig=yes]
> > \definedfont[dejavusansmono*tf]
> >
> > This works fine for DejaVuSansMono and for one Farsi font I use
> > (
> https://github.com/rastikerdar/vazir-font/blob/master/dist/Vazir-Regular.ttf
> > <
> https://github.com/rastikerdar/vazir-font/blob/master/dist/Vazir-Regular.ttf>)
>
> > but not for this other Farsi font
> > (
> https://github.com/aminabedi68/Mikhak/blob/master/Font/ttf/Mikhak-Medium.ttf
> > <
> https://github.com/aminabedi68/Mikhak/blob/master/Font/ttf/Mikhak-Medium.ttf>).
>
> > Perhaps this is because the last font is not standard, but
> > TrueType/OpenType standard is sometimes up for interpretation.
> >
> > I see two strange symptoms here:
> >
> > \showotfcomposition displays the tlig feature differently for the last
> > font.  It appears in the "extra" list, not in "basic".  Why is that?
> > What does this mean anyway?
>
> The font doesn't have endash and emdash so there is nothing to construct
> from the double -
>
> \starttext
>      \definedfont[file:Mikhak-Medium.ttf*default] foo--bar
>      [\char"2013]
>      [\char"2014]
> \stoptext
>
> Just ask the author to add these characters and you're fine.
>
> Hans
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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