Re: [NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
Thanks, Hans, for your advice. > a probably more reliable solution is to 'remove bad stuff' from the > loaded font by running over the features and removing bad matches > (which is less sensitive for order) I could edit the font features, indeed, but I run a GNU/Linux OS, and Fontforge cannot edit nor generate variable fonts. There seems to be a solution (https://www.youtube.com/watch? v=xoQuWARCUWI[1] ), but so far beyond my technical capabilities that I cannot consider it. > is that really a google font? afaik it doesn't originate there (unless > it among those things that google grabs - and at some point possible > discards) Yes, it is, but not from the beginning. A great Garamond, the original font was designed by Georg Duffner. A few years ago, Google decided to make it a more complete font family : Octavio Pardo has done an excellent job with the bolder versions of EB Garamond and its conversion to a variable font. However, for whatever reasons, he did quite a rush job with the OpenType features ! Many essential features are lacking (despite the needed glyphs still being there), and most present features are poorly implemented, with a lot of typographic nonsense (concerning long s and long Q or the mentioned italic ligatures, for instance). https://fonts.google.com/specimen/EB+Garamond[2] I will contact Google Fonts shortly to report on the dozens of problems I have encountered that make the unfixed new version of EB Garamond unusable for anything but the most basic uses. Fortunately, my significantly more demanding needs for a client were met with the invaluable help from LuaTeX, but that won't be enough for my own projects, much more complex (facsimile of ancient editions), until Google improves this font. Thomas Savary 1 le Grand-Plessis F-85340 L’Île-d’Olonne Tél. 06 22 82 61 34 https://compo85.fr/ [1] https://www.youtube.com/watch?v=xoQuWARCUWI [2] https://fonts.google.com/specimen/EB+Garamond ___ 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://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
On 12/25/2021 11:52 PM, Thomas Savary via ntg-context wrote:
Hi Bruce and Hans !
Thank you very much for your answers, that helped me a lot.
In fact, though I would love to switch to ConTeXt one day, I am still
using LuaLaTeX — I am a slow learner and I know it will take me months
to be able to achieve what I need for my job with ConTeXt and can do
with LuaLaTeX and the Memoir class for the time being (despite sometimes
being irritated by LaTeX limitations or oddities).
keep in mind that context font handling and latex font handling can
differ (and not all that is possible in context is in the generic font
loader code); also, in (esp in lmtx) some solutions are not bound to fonts
I need the EB Garamond variable font for future jobs, but this font,
provided by Google Fonts, is such a mess : kerning problems, unusable
OpenType features that have to be rewritten from scratch, shifts in
glyphs table… For sure, the original font by Georg Duffner was much
better, but I need the variable version. Lots of fixing necessary, but
thanks to fonts.handlers.otf.addfeature I have almost succeeded to make
it a usable Garamond.
a probably more reliable solution is to 'remove bad stuff' from the
loaded font by running over the features and removing bad matches (which
is less sensitive for order)
Of course, it would be best to help Google improving this font, but I
don’t have time yet.
is that really a google font? afaik it doesn't originate there (unless
it among those things that google grabs - and at some point possible
discards)
The actual problem was with the italic ligatures "a_s", "e_s", "é_s",
"i_s" and "u_s", that should occur only at the end of words and not
everywhere. Instead of removing the unwanted ligatures, I chose another
way as soon as I understood how to fully use “current” to describe not
only a single glyph, but a string if necessary — for instance, current={
{ "a", "e", "eacute", "i", "u"}, {"s"} }
ok, good that you got it working
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
Hi Bruce and Hans !
Thank you very much for your answers, that helped me a lot.
In fact, though I would love to switch to ConTeXt one day, I am still using
LuaLaTeX — I am a slow
learner and I know it will take me months to be able to achieve what I need for
my job with
ConTeXt and can do with LuaLaTeX and the Memoir class for the time being
(despite sometimes
being irritated by LaTeX limitations or oddities).
I need the EB Garamond variable font for future jobs, but this font, provided
by Google Fonts, is
such a mess : kerning problems, unusable OpenType features that have to be
rewritten from
scratch, shifts in glyphs table… For sure, the original font by Georg Duffner
was much better, but I
need the variable version. Lots of fixing necessary, but thanks to
fonts.handlers.otf.addfeature I
have almost succeeded to make it a usable Garamond.
Of course, it would be best to help Google improving this font, but I don’t
have time yet.
The actual problem was with the italic ligatures "a_s", "e_s", "é_s", "i_s" and
"u_s", that should occur
only at the end of words and not everywhere. Instead of removing the unwanted
ligatures, I chose
another way as soon as I understood how to fully use “current” to describe not
only a single glyph,
but a string if necessary — for instance, current={ { "a", "e", "eacute", "i",
"u"}, {"s"} }
Thanks for this wonderful tool !
Thomas Savary
1 le Grand-Plessis
F-85340 L’Île-d’Olonne
Tél. 06 22 82 61 34
https://compo85.fr/
Le samedi 25 décembre 2021, 00:04:51 CET Bruce Horrocks a écrit :
> > On 24 Dec 2021, at 18:34, Thomas Savary via ntg-context
> > wrote:
> >
> > Hello, dear list !
> >
> > In order to fix a few bugs in some OpenType features included in EB
> > Garamond font provided by Google Fonts, I am trying to remove some
> > ligatures (erroneous in some contexts) with
> > fonts.handlers.otf.addfeature.
> >
> > I must be missing something, because I can't get it to work.
> >
> > Here is a minimal —non working—example :-)
> > (The attempted removal (“f_i” → “fi” only before “o”) is of course
> > irrelevant. I chose it just for the sole purpose of this test, to
> > provide a simple example. What I am trying to achieve is more
> > complex, with other ligatures.)
> >
> > fonts.handlers.otf.addfeature{
> >
> > name = "unfio",
> > type = "chainsubstitution",
> > lookups = {
> >
> > { type = "multiple",
> > data = { [ "f_i" ] = { "f", "i" } }
> > }
> >
> > }
> > rules = {
> >
> > { after = { { "o" } },
> > current = { { "f_i" } },
> > lookups = { 1 } }
> >
> > }
> >
> > }
> >
> > }
> >
> > Could someone please explain to me what I did wrong ?
>
> Firstly, you have an extra } in the example above.
>
> Secondly, rules need to come inside a data section. Thus (untested):
>
> fonts.handlers.otf.addfeature{
> name = "unfio",
> type = "chainsubstitution",
> lookups = {
> {
> type = "substitution",
> data = {
> [ "f_i" ] = { "f", "i" }
> }
> }
> },
> data = {
> rules = {
> {
> after = { { "o" } },___
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Re: [NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
On 12/25/2021 12:04 AM, Bruce Horrocks via ntg-context wrote:
On 24 Dec 2021, at 18:34, Thomas Savary via ntg-context
wrote:
Hello, dear list !
In order to fix a few bugs in some OpenType features included in EB Garamond
font provided by Google Fonts, I am trying to remove some ligatures (erroneous
in some contexts) with fonts.handlers.otf.addfeature.
I must be missing something, because I can't get it to work.
Here is a minimal —non working—example :-)
(The attempted removal (“f_i” → “fi” only before “o”) is of course irrelevant.
I chose it just for the sole purpose of this test, to provide a simple example.
What I am trying to achieve is more complex, with other ligatures.)
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{ type = "multiple",
data = { [ "f_i" ] = { "f", "i" } }
}
}
rules = {
{ after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 } }
}
}
}
Could someone please explain to me what I did wrong ?
Firstly, you have an extra } in the example above.
Secondly, rules need to come inside a data section. Thus (untested):
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{
type = "substitution",
data = {
[ "f_i" ] = { "f", "i" }
}
}
},
data = {
rules = {
{
after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 }
}
}
}
}
A better an dmore reliable approach is this:
\startluacode
local demo = {
name= "demo",
options = {
{
patterns = {
fio = "f|io",
},
words = [[ fioot fiots ]],
},
},
}
table.save("oeps-fixes.llg",demo)
\stopluacode
\setuplanguage[en][goodies={oeps-fixes.llg}]
\setupbodyfont[ebgaramond]
\starttext
fiets fiots fiats fioot
\stoptext
because you want to block certain ligatures but keep kerning etc (see
older posts for more extensive examples)
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
On 12/25/2021 12:04 AM, Bruce Horrocks via ntg-context wrote:
On 24 Dec 2021, at 18:34, Thomas Savary via ntg-context
wrote:
Hello, dear list !
In order to fix a few bugs in some OpenType features included in EB Garamond
font provided by Google Fonts, I am trying to remove some ligatures (erroneous
in some contexts) with fonts.handlers.otf.addfeature.
I must be missing something, because I can't get it to work.
Here is a minimal —non working—example :-)
(The attempted removal (“f_i” → “fi” only before “o”) is of course irrelevant.
I chose it just for the sole purpose of this test, to provide a simple example.
What I am trying to achieve is more complex, with other ligatures.)
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{ type = "multiple",
data = { [ "f_i" ] = { "f", "i" } }
}
}
rules = {
{ after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 } }
}
}
}
Could someone please explain to me what I did wrong ?
Firstly, you have an extra } in the example above.
Secondly, rules need to come inside a data section. Thus (untested):
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{
type = "substitution",
data = {
[ "f_i" ] = { "f", "i" }
}
}
},
data = {
rules = {
{
after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 }
}
}
}
}
the problem with this approach is that in a feature rich font like eb
you never know where to kick this into the sequence and you even don't
know how many variants of fi ligatures are there
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
> On 24 Dec 2021, at 18:34, Thomas Savary via ntg-context
> wrote:
>
> Hello, dear list !
>
> In order to fix a few bugs in some OpenType features included in EB Garamond
> font provided by Google Fonts, I am trying to remove some ligatures
> (erroneous in some contexts) with fonts.handlers.otf.addfeature.
>
> I must be missing something, because I can't get it to work.
>
> Here is a minimal —non working—example :-)
> (The attempted removal (“f_i” → “fi” only before “o”) is of course
> irrelevant. I chose it just for the sole purpose of this test, to provide a
> simple example. What I am trying to achieve is more complex, with other
> ligatures.)
>
> fonts.handlers.otf.addfeature{
> name = "unfio",
> type = "chainsubstitution",
> lookups = {
> { type = "multiple",
> data = { [ "f_i" ] = { "f", "i" } }
> }
> }
> rules = {
> { after = { { "o" } },
> current = { { "f_i" } },
> lookups = { 1 } }
> }
> }
> }
>
> Could someone please explain to me what I did wrong ?
Firstly, you have an extra } in the example above.
Secondly, rules need to come inside a data section. Thus (untested):
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{
type = "substitution",
data = {
[ "f_i" ] = { "f", "i" }
}
}
},
data = {
rules = {
{
after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 }
}
}
}
}
Regards,
—
Bruce Horrocks
Hampshire, UK
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[NTG-context] Contextual removal of some ligatures using fonts.handlers.otf.addfeature (LuaTeX 1.13.2)
Hello, dear list !
In order to fix a few bugs in some OpenType features included in EB Garamond
font provided by
Google Fonts, I am trying to remove some ligatures (erroneous in some contexts)
with
fonts.handlers.otf.addfeature.
I must be missing something, because I can't get it to work.
Here is a minimal —non working—example :-)
(The attempted removal (“f_i” → “fi” only before “o”) is of course irrelevant.
I chose it just for the
sole purpose of this test, to provide a simple example. What I am trying to
achieve is more complex,
with other ligatures.)
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{ type = "multiple",
data = { [ "f_i" ] = { "f", "i" } }
}
}
rules = {
{ after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 } }
}
}
}
Could someone please explain to me what I did wrong ?
Thomas Savary
1 le Grand-Plessis
F-85340 L’Île-d’Olonne
Tél. 06 22 82 61 34
https://compo85.fr/
___
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