Re: Fallback fails for Linux Libertine O to Junicode over private area, debugging?

[Youssef Cherem via ntg-context <ntg-context@ntg.nl>]

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Is it just your example, or do you really just want those ligatures?

fre. 7. jan. 2022 kl. 12:33 skrev J. P. Ascher via ntg-context <
ntg-context@ntg.nl>:

> Hi, all,
>
> I'm a long time lurker (on gmane), first time poster. First, thank you
> all, very much, for your excellent work and superb community.
> ConTeXt has become a critical part of my academic writing and integral
> to my research.  I'm not exaggerating when I say it changed how
> I thought about texts and became a major source for my dissertation
> work.  Thank you!
>
> I'm trying to get a typescript for setting a text in Libertine with
> Junicode fallbacks for characters in MUFI, in the private use area.
> For some reason Libertine roman will not fallback no matter what
> I do. However Libertine italic will.  I can also work around it by using
> Junicode as a base and forcing fallback to Libertine.
>
> My question is: why?  What's wrong with Libertine roman?  Or my approach?
>
> My hypothesis is that there's something about `LinLibertine_R.otf`
> that's not quite right.  I looked in FontForge, but couldn't
> spot anything.
>
> Does anyone have a suggestion as to another place to look?  Or something
> I'm overlooking?
>
> Minimal example (attached too, if it comes through):
>
> ```
> \definefontfeature[default][default][script=latn]
>
>
> % Libertine with a Junicode fallback, lib-fb-jun
>
>
> \definefontfallback[junicodefallback][name:Junicode][privateusearea][check=yes,force=no]
>
> \starttypescript [serif] [lib-fb-jun]
>   \definefontsynonym [Libertine-Roman]     [file:linlibertiner]
>   \definefontsynonym [Libertine-Slanted]  [file:linlibertineri]  % works
> fine
> \stoptypescript
>
> \starttypescript [serif] [lib-fb-jun] [name]
>   \definefontsynonym [Serif]            [Libertine-Roman]
>  [features=default,fallbacks=junicodefallback]
>   \definefontsynonym [SerifSlanted]     [Libertine-Slanted]
> [features=default,fallbacks=junicodefallback]
> \stoptypescript
>
> \starttypescript [lib-fb-jun]
>   \definetypeface [lib-fb-jun] [rm] [serif] [lib-fb-jun] [default]
> \stoptypescript
>
>
> % Junicode with Libertine as a fallback, preferring Libertine, jun-pr-lib
> % this hack does what I want the above to do
>
>
> \definefontfallback[preferlibertine][name:linlibertineo][0-FFFFF][check=yes,force=yes]
>
> \starttypescript[serif] [jun-pr-lib]
>    \definefontsynonym [JunicodeRoman] [name:Junicode]
> \stoptypescript
>
> \starttypescript[serif] [jun-pr-lib] [name]
>    \definefontsynonym [Serif] [JunicodeRoman] [fallbacks=preferlibertine]
> \stoptypescript
>
> \starttypescript [jun-pr-lib]
>   \definetypeface [jun-pr-lib] [rm] [serif] [jun-pr-lib] [default]
> \stoptypescript
>
>
> % some tracking stuff
>
> \enabletrackers[fonts.missing=replace]
> \enabledirectives[logs.errors]
>
>
> % text, we use lib-fb-jun first, then jun-pr-lib
>
> \starttext
> \setupbodyfont[lib-fb-jun]
>
> {\em emph. lib-fb-jun: \Uchar61125 \char64259 \utfchar{"eec5} (three
> glyphs)}
>
> lib-fb-jun: \Uchar61125 \char64259 \utfchar{"eec5} (three glyphs)  % <-
> fallback fails here
>
> \switchtobodyfont[jun-pr-lib]
>
> jun-pr-lib: \Uchar61125 \char64259 \utfchar{"eec5} (three glyphs) % <-
> works
>
> \stoptext
> ```
>
> Any ideas?
>
> Most warmly,
> -jp
>
> --
> J. P. Ascher
> Preceding: https://doi.org/10.18130/jqpe-zc65
> Current: http://www.bibsoc.org.uk/content/2020-2021-0
>
>
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