frac font feature doesn't work as expected

frac font feature doesn't work as expected

[Ulrike Fischer]

\starttext

\font\test={file:linlibertine_r.otf:+frac}
\test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
\stoptext

gives as output

½ 3¾ 5⅚ 7⅜ 9/10 1⅟12 31415/27182 1000/1000000


(I couldn't build an example without the primitive command. After
\definefontfeature[frac][frac=yes]
\definefontfamily[default][rm][linuslibertineo][features=frac]
context always falls back to latin modern)

A similar plaintex example for xetex

\font\test="[linlibertine_r.otf]:+frac"
\test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
\bye

gives the correct result:

¹⁄₂ ³⁄₄ ⁵⁄₆ ⁷⁄₈ ⁹⁄₁₀ ¹¹⁄₁₂ ³¹⁴¹⁵⁄₂₇₁₈₂ ¹⁰⁰⁰⁄₁₀₀₀₀₀₀

A plain tex example for luatex is broken too but differently to the
context version, one gets at least the correct numbers:

\input luaotfload.sty
\font\test={file:linlibertine_r.otf:+frac}
\test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
\bye


½ ¾ ⅚ ⅞ 9/10 1⅟12 31415/27182 1000/1000000




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

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Re: frac font feature doesn't work as expected

[luigi scarso]

On Wed, Apr 5, 2017 at 10:15 AM, Ulrike Fischer <news3@nililand.de> wrote:
> \starttext
>
> \font\test={file:linlibertine_r.otf:+frac}
> \test 1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000
> \stoptext
>
> gives as output
>
> ½ 3¾ 5⅚ 7⅜ 9/10 1⅟12 31415/27182 1000/1000000


\usetypescriptfile[libertine]
\setupbodyfont[libertine,12pt]
\definefontfeature[frac][frac=yes]

\starttext

{\addff{frac}  1/2 3/4 5/6 7/8 9/10 11/12 31415/27182 1000/1000000}
\stoptext

if you see
fonts           > otf chain > feature 'frac', type
'gsub_contextchain', chain lookup 's_s_7':  is not yet supported (1)
then ... it need to be supported.

( I have a local patch (by Hnas) that gives
¹⁄₂ ³⁄₄ ⁵⁄₆ ⁷⁄₈ ⁹⁄₁₀ ¹¹⁄₁₂ ³¹⁴¹⁵⁄₂₇₁₈₂ ¹⁰⁰⁰⁄₁₀₀₀₀₀₀
with the otf fonts from
http://www.ctan.org/tex-archive/fonts/libertine
)

-- 
luigi
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Re: frac font feature doesn't work as expected

[Ulrike Fischer]

Am Wed, 5 Apr 2017 13:00:29 +0200 schrieb luigi scarso:


> if you see
> fonts           > otf chain > feature 'frac', type
> 'gsub_contextchain', chain lookup 's_s_7':  is not yet supported (1)
> then ... it need to be supported.

Yes, that's what I see ;-(.
-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/

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