Re: [NTG-context] Fallback fails for Linux Libertine O to Junicode over private area, debugging?

Thanks for asking! It's just my example. I maintain JunicodeRX (...with Restoration Typographical Extensions) which includes yet more non-standard code points and which I continue to add to. In my actual work, I also add in Symbola for additional fallbacks. Some fonts have better language coverage (Libertine) and others have some custom glyphs I want (JunicodeRX and Symbola). If I had a bit more time, I suspect maintaining a stand-alone Libertine+JunicodeRX+Symbola.otf would be the best approach, but that's a bit beyond me these days. On Fri, Jan 07 2022, 13:52:05 -03 Youssef Cherem wrote:

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 :

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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