[NTG-context] Re: \em issue in MkXL (2024.03.05 11:26)

[Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>]

Hans Hagen via ntg-context schrieb am 10.03.2024 um 10:46:
> On 3/10/2024 9:32 AM, Pablo Rodriguez via ntg-context wrote:
>> On 3/9/24 16:04, Wolfgang Schuster wrote:
>>> Pablo Rodriguez via ntg-context schrieb am 08.03.2024 um 19:39:
>>>> [...]
>>>>     \enableexperiments[fonts.compact]
>>>>
>>>> Which seeems weird to me. Or at least, I thought I read that Hans
>>>> enabled it by default in LMTX.
>>>
>>> AFAIR Hans uses the setting in his own documents.
>>
>> I have been using it for a while.
>>
>> I hope the issue with \glyphslant might be fixed to enable it again.
>>
>>>> Then my question is whether this was caused by simply enabling compact
>>>> fonts or by doing it twice.
>>>
>>> The results happen when you use compact mode and is a result of
>>> \glyphslant which keeps the value of the italic style even when you
>>> switch back to the upright style.
>>
>> Many thanks for your explaination,
> using the low level commands
> 
> \glyphscale
> \glyphxscale
> \glyphyscale
> \glyphslant
> \glyphweight
> 
> directly can have side efects when at an outer level these are also set, 
> so you need to accumulate, like
> 
> \starttext
> 
> test {\glyphscale 2000 test \glyphscale \numericscaled1.2\glyphscale 
> test} test
> 
> test {\glyphslant  500 test \glyphslant \numericscaled2.0\glyphslant 
> test} test
> 
> test {\glyphweight 100 test \glyphweight\numericscaled2.0\glyphweight 
> test} test
> 
> \stoptext

The problem is that compact mode uses them to apply the slanted feature 
without any manual use of the commands from a user.

\enableexperiments[fonts.compact]

\definefontfamily[mainface][rm][TeX Gyre Termes]
   [it={style:regular, features:{default,slanted}},
    sl={style:regular, features:{default,slanted}}]

\setupbodyfont[mainface]

\starttext

\startstyle[style=italic]normal {\em emphasized} normal\stopstyle

\stoptext

The only way to mask the effect is to create a new fontfeature with the 
minimum slant value and apply it to the upright style.

\definefontfeature [unslanted] [slant=0.001]

\definefontfamily[mainface][rm][TeX Gyre Termes]
   [features={default,unslanted},
    it={style:regular, features:{default,slanted}},
    sl={style:regular, features:{default,slanted}}]

Wolfgang
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