Fwd: Re: Math kerning broken in latest beta

Fwd: Re: Math kerning broken in latest beta

[Hans Hagen]

-------- Forwarded Message --------
Subject: Re: [NTG-context] Math kerning broken in latest beta
Date: Wed, 11 Apr 2018 17:23:18 +0200
From: Hans Hagen <j.hagen@xs4all.nl>
To: Ulrike Fischer <news3@nililand.de>

On 4/11/2018 4:27 PM, Ulrike Fischer wrote:
> Am Wed, 11 Apr 2018 15:26:34 +0200 schrieb Hans Hagen:
> 
>> The usual 'math italic mess' where fonts assume italic correction
>> instead of proper math kerns.
> 
> Do you know a (free) math font with proper math kerns? I made a fast
> search through the lua files of my font cache but couldn't find
> anything saying "mathkern".
afaik only cambria has them but there has been a discussion about adding 
them to gyre fonts but even italics and other thinsg are somewhat 
inconsistent ... for instance some fonts have a traditional tex kind of 
boundingbox approach, some don't .. it's a mess

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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Re: Fwd: Re: Math kerning broken in latest beta

[Ulrike Fischer]

Am Wed, 11 Apr 2018 17:23:35 +0200 schrieb Hans Hagen:

> afaik only cambria has them

But with cambria the subscript isn't correct either when it is a
single char:

\setupbodyfont[cambria]
\starttext
 $\gamma_{ee} \gamma_{e}$

 $T_{\tf fluff}$

 $T_{\tf f}$
\stoptext


(tested with ConTeXt  ver: 2018.04.04 00:51 MKIV beta  fmt:
2018.4.11)


-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/

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Re: Fwd: Re: Math kerning broken in latest beta

[Hans Hagen]

On 4/12/2018 12:10 AM, Ulrike Fischer wrote:
> Am Wed, 11 Apr 2018 17:23:35 +0200 schrieb Hans Hagen:
> 
>> afaik only cambria has them
> 
> But with cambria the subscript isn't correct either when it is a
> single char:
> 
> \setupbodyfont[cambria]
> \starttext
>   $\gamma_{ee} \gamma_{e}$
> 
>   $T_{\tf fluff}$
> 
>   $T_{\tf f}$
> \stoptext
> 
> 
> (tested with ConTeXt  ver: 2018.04.04 00:51 MKIV beta  fmt:
> 2018.4.11)
i'll look into it ... (but even cambria doesn't have all these kerns .. 
as said: a mess)

i'll probably also tag the kerns to reflect when is used (more handy for 
tracing)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: Fwd: Re: Math kerning broken in latest beta

[Ulrike Fischer]

Am Thu, 12 Apr 2018 10:06:17 +0200 schrieb Hans Hagen:

>> But with cambria the subscript isn't correct either when it is a
>> single char:
>> 
>> \setupbodyfont[cambria]
>> \starttext
>>   $\gamma_{ee} \gamma_{e}$
>> 
>>   $T_{\tf fluff}$
>> 
>>   $T_{\tf f}$
>> \stoptext

> i'll look into it ... (but even cambria doesn't have all these kerns .. 
> as said: a mess)

With the newest context the problem is gone. In latex too if I use
luatex 1.08 instead of luatex 1.07. So I guess it was an engine bug
;-). 



-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/

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Re: Fwd: Re: Math kerning broken in latest beta

[Hans Hagen]

On 4/20/2018 4:22 PM, Ulrike Fischer wrote:
> Am Thu, 12 Apr 2018 10:06:17 +0200 schrieb Hans Hagen:
> 
>>> But with cambria the subscript isn't correct either when it is a
>>> single char:
>>>
>>> \setupbodyfont[cambria]
>>> \starttext
>>>    $\gamma_{ee} \gamma_{e}$
>>>
>>>    $T_{\tf fluff}$
>>>
>>>    $T_{\tf f}$
>>> \stoptext
> 
>> i'll look into it ... (but even cambria doesn't have all these kerns ..
>> as said: a mess)
> 
> With the newest context the problem is gone. In latex too if I use
> luatex 1.08 instead of luatex 1.07. So I guess it was an engine bug
> ;-).
depends on ones view: it's controlled by a (yet another) variable now 
that default to 'just inject them' but interference with proper math 
kerns can happen in that case (it's just that not many fonts have both 
of them) ... so, at some point in context (when we have better math 
fonts) i'll add some checks and disable it selectively (because i don't 
want that interference)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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