[NTG-context] Re: issue mixing font features (LMTX & MkIV)

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

On 3/3/2024 11:54 AM, Pablo Rodriguez via ntg-context wrote:
> Dear list,
> 
> I have the following sample:
> 
>    \definefontfeature[wider][extend=2]
> 
>    \definefontfamily[mainface][rm][TeX Gyre Pagella]
>      [features={default, quality, wider},
>       it={style: regular, features:{default, slanted, quality}},
>       bf={style: regular, features:{default, boldened-30}},
>       bi={style: regular, features:{default, boldened-30, slanted}}]
> 
>    \setupbodyfont
>      [mainface, 30pt]
> 
>    \starttext
>    \startTEXpage[offset=1ex]
>    a
>    {\it a}\\
>    {\bf a}
>    {\bi a}
>    \stopTEXpage
>    \stoptext
> 
> With current latest (2024.02.27 09:21), LuaTeX gets boldened and slanted
> for regular (but the other fonts cannot inherit the wider feature and
> wider will not mix with boldened-30 [even when specified]).
> 
> For some reason, LMTX from current latest cannot get slanted and
> boldened-30 (but it mixes the inherited wider feature in all fonts).
> 
> This began to behave differently in latest from 2024.01.08 11:23 (which
> is my next version after the one from 2023.09.26 18:19).
> 
> Could anyone confirm the issue?
accumulating these effects is dependent on how the features that you use 
are defined

in luametatex we have a bit more advanced mechanism (also relates to 
compact mode) because th eengine is a bit more clever

just make sure that you don't add up features where one calcels the 
other, so use for instance:

\definefontfeature[wide]         [extend=2]
\definefontfeature[wideslant]    [extend=2,slant=.2]
\definefontfeature[widebold]     [extend=2,weight=.1]
\definefontfeature[wideboldslant][extend=2,weight=.1,slant=.2]

\definefontfamily[mainface][rm][TeX Gyre Pagella]
   [tf={style:regular,features:{default,quality,wide}},
    it={style:regular,features:{default,quality,wideslant}},
    bf={style:regular,features:{default,quality,widebold}},
    bi={style:regular,features:{default,quality,wideboldslant}}]

\setupbodyfont
   [mainface,30pt]

\starttext
\startTEXpage[offset=1ex]
a
{\it a}
{\bf a}
{\bi a}
\stopTEXpage
\stoptext



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