[fontloader] positioning of diacritics

[fontloader] positioning of diacritics

[Philipp Gesang]

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Good morning!

This report by Github user SverreStausland has been lingering on
the Luaotfload tracker for a while: There appears to be a
difference between how certain faces of the Libertine family
handle the placement of diacritics.

With Version 5.1.2 of the family [0], the "RZI" version
(fullname: “Linux Libertine O Semibold Italic”) shows a different
behavior than its “RZ” companion (“Linux Libertine O Semibold”).
Short demonstration in Context:

    \definefontfeature [ourfeats] [default] [mode=node]

    \starttext
      \start \definedfont [file:LinLibertine_RI.otf*ourfeats]  V\char"0306 \stop
      \start \definedfont [file:LinLibertine_RZI.otf*ourfeats] V\char"0306 \stop
    \stoptext

Note the misaligned combining breve above the latter. An
equivalent test for Plain [1] shows that the correct position
information is there somewhere in the font, since the Xetex
engine typesets it correctly.

Best regards,
Philipp

[0] MD5 hashes of the files:

    4bfd3481c1486f5d1ea13304981df7a6  LinLibertine_RZI.otf
    153765bd2b29d6026fb2fa0b198a4995  LinLibertine_RZ.otf

[1] https://bitbucket.org/phg/lua-la-tex-tests/src/tip/pln-diacritics-1.tex


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Re: [fontloader] positioning of diacritics

[Hans Hagen]

On 12/15/2014 8:08 AM, Philipp Gesang wrote:
> Good morning!
>
> This report by Github user SverreStausland has been lingering on
> the Luaotfload tracker for a while: There appears to be a
> difference between how certain faces of the Libertine family
> handle the placement of diacritics.
>
> With Version 5.1.2 of the family [0], the "RZI" version
> (fullname: “Linux Libertine O Semibold Italic”) shows a different
> behavior than its “RZ” companion (“Linux Libertine O Semibold”).
> Short demonstration in Context:
>
>      \definefontfeature [ourfeats] [default] [mode=node]
>
>      \starttext
>        \start \definedfont [file:LinLibertine_RI.otf*ourfeats]  V\char"0306 \stop
>        \start \definedfont [file:LinLibertine_RZI.otf*ourfeats] V\char"0306 \stop
>      \stoptext
>
> Note the misaligned combining breve above the latter. An
> equivalent test for Plain [1] shows that the correct position
> information is there somewhere in the font, since the Xetex
> engine typesets it correctly.

it's a bug in the font:

uni0306 in the second one has class "base" while in the first one it has 
class "mark" and context checks on that

\enabletrackers[otf.bugs]

> Best regards,
> Philipp
>
> [0] MD5 hashes of the files:
>
>      4bfd3481c1486f5d1ea13304981df7a6  LinLibertine_RZI.otf
>      153765bd2b29d6026fb2fa0b198a4995  LinLibertine_RZ.otf
>
> [1] https://bitbucket.org/phg/lua-la-tex-tests/src/tip/pln-diacritics-1.tex
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


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___________________________________________________________________________________
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___________________________________________________________________________________

Re: [fontloader] positioning of diacritics

[Philipp Gesang]

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···<date: 2014-12-15, Monday>···<from: Hans Hagen>···

> On 12/15/2014 8:08 AM, Philipp Gesang wrote:
> > Good morning!
> >
> > This report by Github user SverreStausland has been lingering on
> > the Luaotfload tracker for a while: There appears to be a
> > difference between how certain faces of the Libertine family
> > handle the placement of diacritics.
> >
> > With Version 5.1.2 of the family [0], the "RZI" version
> > (fullname: “Linux Libertine O Semibold Italic”) shows a different
> > behavior than its “RZ” companion (“Linux Libertine O Semibold”).
> > Short demonstration in Context:
> >
> >      \definefontfeature [ourfeats] [default] [mode=node]
> >
> >      \starttext
> >        \start \definedfont [file:LinLibertine_RI.otf*ourfeats]  V\char"0306 \stop
> >        \start \definedfont [file:LinLibertine_RZI.otf*ourfeats] V\char"0306 \stop
> >      \stoptext
> >
> > Note the misaligned combining breve above the latter. An
> > equivalent test for Plain [1] shows that the correct position
> > information is there somewhere in the font, since the Xetex
> > engine typesets it correctly.
> 
> it's a bug in the font:
> 
> uni0306 in the second one has class "base" while in the first one it has 
> class "mark" and context checks on that
> 
> \enabletrackers[otf.bugs]

Thanks for the reply and for the pointer. That tracker is indeed
pretty handy!

I attempted to open a bug report on the Libertine tracker but
Sourceforge refuses to cooperate :/ Maybe next time.

Best regards,
Philipp


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___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: [fontloader] positioning of diacritics

[Herbert Voss]

Am 15.12.2014 um 21:43 schrieb Philipp Gesang:

>> \enabletrackers[otf.bugs]
>
> Thanks for the reply and for the pointer. That tracker is indeed
> pretty handy!
>
> I attempted to open a bug report on the Libertine tracker but
> Sourceforge refuses to cooperate :/ Maybe next time.

As far as I know there is no more a development of Libertine

Herbert

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___________________________________________________________________________________

Re: [fontloader] positioning of diacritics

[Philipp Gesang]

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···<date: 2014-12-15, Monday>···<from: Herbert Voss>···

> Am 15.12.2014 um 21:43 schrieb Philipp Gesang:
> 
> >> \enabletrackers[otf.bugs]
> >
> > Thanks for the reply and for the pointer. That tracker is indeed
> > pretty handy!
> >
> > I attempted to open a bug report on the Libertine tracker but
> > Sourceforge refuses to cooperate :/ Maybe next time.
> 
> As far as I know there is no more a development of Libertine

The font is open source to some extent, isn’t it? Any feedback
will be valuable should someone decide to take up maintainance /
development.

Philipp


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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________