Fwd: ligature exceptions

Fwd: ligature exceptions

[Henning Hraban Ramm]

Am 2017-09-28 um 01:16 schrieb Hans Hagen <pragma@wxs.nl>:

> On 9/27/2017 11:08 PM, Thomas A. Schmitz wrote:
>> On 09/27/2017 10:25 PM, Henning Hraban Ramm wrote:
>>> Thank you for the suggestion.
>>> I tried
>>> 
>>> \replaceword[eka][Auflage][Au{fl}age]
>>> \setreplacements[eka]
>>> 
>>> and even converted the german wordlist from the selnolig package, but it doesn’t help.
>> Works here. You'll have to make a real example.
> I'll add an extra (simple) definition format:
> 
> \replaceword [eka] [Au{fl}age Shiff{f}ahrt]
> 
> I leave it to others to collect (reasonable) lists of words. We can these to the distribution then.

Thank you very much, it works now.
Here’s* the converted German wordlist from the selnolig package, still in the "old" single word syntax.
I just \input it in my environment. I didn’t measure, but I don’t experience a delay - great!

I’ll also add a wiki page about ligatures.**

*) The message didn’t make it to the list on the first try, because the attachment was too big.
It’s now at http://wiki.contextgarden.net/images/b/be/nolig-german-wordlist.tex
**) http://wiki.contextgarden.net/Ligatures

Greetlings, Hraban
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Re: ligature exceptions

[Henning Hraban Ramm]

[-- Attachment #1: Type: text/plain, Size: 1064 bytes --]

I rejoiced too early:
While the ligature exception handling works with some of the default fonts (lm, termes, pagella), it fails with the Alegreya fonts that I’m using.
I’d be glad if someone (you?) could look into my attached typescript file or even try downloading the fonts* to check what’s going on.

*) https://fonts.google.com/?selection.family=Alegreya|Alegreya+SC|Alegreya+Sans|Alegreya+Sans+SC

\mainlanguage[de]

%\usetypescriptfile	[type-alegreya]
%\usetypescript	[alegreya-light]
%\setupbodyfont	[alegreya,rm,16pt]
\setupbodyfont	[termes,rm,16pt]

\definefontfeature[default]
[mode=node,kern=yes,
liga=yes,tlig=yes,
ccmp=yes,language=dflt,
protrusion=quality,
expansion=quality]

\replaceword[eka][Auflage][Au{fl}age]
\replaceword[eka][Kampffront][Kamp{ff}ront]

\starttext
falsch: Auflage Kampffront

richtig: Au\noligature{fl}age Kamp\noligature{ff}ront

\setreplacements[eka]
richtig: Auflage Kampffront
\stoptext



Greetlings, Hraban
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[-- Attachment #2: type-alegreya.tex --]
[-- Type: application/octet-stream, Size: 8005 bytes --]

\definefontfeature
[alefeatures]
[mode=node,kern=yes,
  tlig=yes,liga=yes,
  ccmp=yes,language=dflt,
  protrusion=quality,
  expansion=quality]

\starttypescript [sans] [alegreya,alegreya-light,alegreya-medium]
  %\setups[font:fallback:serif]
  \definefontsynonym[AlegreyaSans-Thin]             [name:AlegreyaSans-Thin]
  \definefontsynonym[AlegreyaSans-ThinItalic]       [name:AlegreyaSans-ThinItalic]
  \definefontsynonym[AlegreyaSans-ThinCaps]         [name:AlegreyaSansSC-Thin]
  \definefontsynonym[AlegreyaSans-ThinItalicCaps]   [name:AlegreyaSansSC-ThinItalic]
  \definefontsynonym[AlegreyaSans-Light]            [name:AlegreyaSans-Light]
  \definefontsynonym[AlegreyaSans-LightItalic]      [name:AlegreyaSans-LightItalic]
  \definefontsynonym[AlegreyaSans-LightCaps]        [name:AlegreyaSansSC-Light]
  \definefontsynonym[AlegreyaSans-LightItalicCaps]  [name:AlegreyaSansSC-LightItalic]
  \definefontsynonym[AlegreyaSans-Regular]          [name:AlegreyaSans-Regular]
  \definefontsynonym[AlegreyaSans-Italic]           [name:AlegreyaSans-Italic]
  \definefontsynonym[AlegreyaSans-Caps]             [name:AlegreyaSansSC-Regular]
  \definefontsynonym[AlegreyaSans-ItalicCaps]       [name:AlegreyaSansSC-Italic]
  \definefontsynonym[AlegreyaSans-Medium]           [name:AlegreyaSans-Medium]
  \definefontsynonym[AlegreyaSans-MediumItalic]     [name:AlegreyaSans-MediumItalic]
  \definefontsynonym[AlegreyaSans-MediumCaps]       [name:AlegreyaSansSC-Medium]
  \definefontsynonym[AlegreyaSans-MediumItalicCaps] [name:AlegreyaSansSC-MediumItalic]
  \definefontsynonym[AlegreyaSans-Bold]             [name:AlegreyaSans-Bold]
  \definefontsynonym[AlegreyaSans-BoldItalic]       [name:AlegreyaSans-BoldItalic]
  \definefontsynonym[AlegreyaSans-BoldCaps]         [name:AlegreyaSansSC-Bold]
  \definefontsynonym[AlegreyaSans-BoldItalicCaps]   [name:AlegreyaSansSC-BoldItalic]
  \definefontsynonym[AlegreyaSans-ExtraBold]        [name:AlegreyaSans-ExtraBold]
  \definefontsynonym[AlegreyaSans-ExtraBoldItalic]  [name:AlegreyaSans-ExtraBoldItalic]
  \definefontsynonym[AlegreyaSans-ExtraBoldCaps]    [name:AlegreyaSansSC-ExtraBold]
  \definefontsynonym[AlegreyaSans-ExtraBoldItalicCaps][name:AlegreyaSansSC-ExtraBoldItalic]
  \definefontsynonym[AlegreyaSans-Black]             [name:AlegreyaSans-Black]
  \definefontsynonym[AlegreyaSans-BlackItalic]       [name:AlegreyaSans-BlackItalic]
  \definefontsynonym[AlegreyaSans-BlackCaps]         [name:AlegreyaSansSC-Black]
  \definefontsynonym[AlegreyaSans-BlackItalicCaps]   [name:AlegreyaSansSC-BlackItalic]
\stoptypescript

\starttypescript [serif] [alegreya]
  \definefontsynonym[AlegreyaSerif-Regular]         [name:Alegreya-Regular]
  \definefontsynonym[AlegreyaSerif-Italic]          [name:Alegreya-Italic]
  \definefontsynonym[AlegreyaSerif-Caps]            [name:AlegreyaSC-Regular]
  \definefontsynonym[AlegreyaSerif-Bold]            [name:Alegreya-Bold]
  \definefontsynonym[AlegreyaSerif-BoldItalic]      [name:Alegreya-BoldItalic]
  \definefontsynonym[AlegreyaSerif-BoldCaps]        [name:AlegreyaSC-Bold]
  \definefontsynonym[AlegreyaSerif-Black]           [name:Alegreya-Black]
  \definefontsynonym[AlegreyaSerif-BlackItalic]     [name:Alegreya-BlackItalic]
  \definefontsynonym[AlegreyaSerif-BlackCaps]       [name:AlegreyaSC-Black]
\stoptypescript

\starttypescript [sans] [alegreya] [name]
  %\setups[font:fallback:sans]
  \definefontsynonym [Sans]           [AlegreyaSans-Regular]     [features=alefeatures]
  \definefontsynonym [SansItalic]     [AlegreyaSans-Italic]      [features=alefeatures]
  \definefontsynonym [SansSlanted]    [AlegreyaSans-Italic]      [features=alefeatures]
  \definefontsynonym [SansBold]       [AlegreyaSans-Bold]        [features=alefeatures]
  \definefontsynonym [SansBoldItalic] [AlegreyaSans-BoldItalic]  [features=alefeatures]
  \definefontsynonym [SansBoldSlanted][AlegreyaSans-BoldItalic]  [features=alefeatures]
  \definefontsynonym [SansCaps]       [AlegreyaSans-Caps]        [features=alefeatures]
  \definefontsynonym [SansThin]         [AlegreyaSans-Thin]      [features=alefeatures]
  \definefontsynonym [SansThinItalic]   [AlegreyaSans-ThinItalic][features=alefeatures]
  \definefontsynonym [SansThinSlanted]  [AlegreyaSans-ThinItalic][features=alefeatures]
  \definefontsynonym [SansThinCaps]     [AlegreyaSans-ThinCaps]  [features=alefeatures]
  \definefontsynonym [SansLight]        [AlegreyaSans-Light]     [features=alefeatures]
  \definefontsynonym [SansLightItalic]  [AlegreyaSans-LightItalic][features=alefeatures]
  \definefontsynonym [SansLightSlanted] [AlegreyaSans-LightItalic][features=alefeatures]
  \definefontsynonym [SansLightCaps]    [AlegreyaSans-LightCaps]  [features=alefeatures]
  \definefontsynonym [SansMedium]       [AlegreyaSans-Medium]     [features=alefeatures]
  \definefontsynonym [SansMediumItalic] [AlegreyaSans-MediumItalic][features=alefeatures]
  \definefontsynonym [SansMediumSlanted][AlegreyaSans-MediumItalic][features=alefeatures]
\stoptypescript

\starttypescript [sans] [alegreya-light] [name]
  \definefontsynonym [Sans]           [AlegreyaSans-Light]         [features=alefeatures]
  \definefontsynonym [SansItalic]     [AlegreyaSans-LightItalic]   [features=alefeatures]
  \definefontsynonym [SansSlanted]    [AlegreyaSans-LightItalic]   [features=alefeatures]
  \definefontsynonym [SansCaps]       [AlegreyaSans-LightCaps]     [features=alefeatures]
  \definefontsynonym [SansBold]       [AlegreyaSans-Medium]        [features=alefeatures]
  \definefontsynonym [SansBoldItalic] [AlegreyaSans-MediumItalic]  [features=alefeatures]
  \definefontsynonym [SansBoldSlanted][AlegreyaSans-MediumItalic]  [features=alefeatures]
\stoptypescript

\starttypescript [sans] [alegreya-medium] [name]
  \definefontsynonym [Sans]           [AlegreyaSans-Medium]         [features=alefeatures]
  \definefontsynonym [SansItalic]     [AlegreyaSans-MediumItalic]   [features=alefeatures]
  \definefontsynonym [SansSlanted]    [AlegreyaSans-MediumItalic]   [features=alefeatures]
  \definefontsynonym [SansCaps]       [AlegreyaSans-MediumCaps]     [features=alefeatures]
  \definefontsynonym [SansBold]       [AlegreyaSans-ExtraBold]        [features=alefeatures]
  \definefontsynonym [SansBoldItalic] [AlegreyaSans-ExtraBoldItalic]  [features=alefeatures]
  \definefontsynonym [SansBoldSlanted][AlegreyaSans-ExtraBoldItalic]  [features=alefeatures]
\stoptypescript

\starttypescript [serif] [alegreya] [name]
  \definefontsynonym [Serif]           [AlegreyaSerif-Regular]     [features=alefeatures]
  \definefontsynonym [SerifItalic]     [AlegreyaSerif-Italic]      [features=alefeatures]
  \definefontsynonym [SerifSlanted]    [AlegreyaSerif-Italic]      [features=alefeatures]
  \definefontsynonym [SerifBold]       [AlegreyaSerif-Bold]        [features=alefeatures]
  \definefontsynonym [SerifBoldItalic] [AlegreyaSerif-BoldItalic]  [features=alefeatures]
  \definefontsynonym [SerifBoldSlanted][AlegreyaSerif-BoldItalic]  [features=alefeatures]
  \definefontsynonym [SerifCaps]       [AlegreyaSerif-Caps]        [features=alefeatures]
\stoptypescript

\starttypescript [alegreya]
  \definetypeface [alegreya] [rm] [serif] [alegreya] [default]
  \definetypeface [alegreya] [ss] [sans]  [alegreya]  [default]
  \definetypeface [alegreya] [tt] [mono]  [modern]   [default]
  \definetypeface [alegreya] [mm] [math]  [default]   [default]
\stoptypescript

\starttypescript [alegreya-light]
  \definetypeface [alegreya] [rm] [serif] [alegreya] [default]
  \definetypeface [alegreya] [ss] [sans]  [alegreya-light]  [default]
  \definetypeface [alegreya] [tt] [mono]  [modern]   [default]
  \definetypeface [alegreya] [mm] [math]  [default]   [default]
\stoptypescript

\starttypescript [alegreya-medium]
  \definetypeface [alegreya] [rm] [serif] [alegreya] [default]
  \definetypeface [alegreya] [ss] [sans]  [alegreya-medium]  [default]
  \definetypeface [alegreya] [tt] [mono]  [modern]   [default]
  \definetypeface [alegreya] [mm] [math]  [default]   [default]
\stoptypescript

[-- Attachment #3: Type: text/plain, Size: 492 bytes --]

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Re: ligature exceptions

[Pablo Rodriguez]

On 10/07/2017 01:25 PM, Henning Hraban Ramm wrote:
> I rejoiced too early:
> While the ligature exception handling works with some of the default
> fonts (lm, termes, pagella), it fails with the Alegreya fonts that I’m
> using.

The Brill fonts don’t work either (http://www.brill.com/about/brill-fonts).

    \definefontfamily[mainfont][rm][Alegreya]
    \definefontfamily[otherfont][rm][Brill]
    \setupbodyfont [mainfont,16pt]

    \starttext
    \startTEXpage[offset=1em]
    \startbuffer
    falsch: Auflage Kampffront

    richtig: Au\noligature{fl}age Kamp\noligature{ff}ront

    \setreplacements[eka]
    richtig: Auflage Kampffront

    f ft fl fk fb ff

    f f\/t f\/l f\/k f\/b f\/f
    \resetreplacements
    \stopbuffer

    \getbuffer

    \setupbodyfont[times]\getbuffer

    \setupbodyfont[otherfont]\getbuffer
    \stopTEXpage
    \stoptext

Both Alegreya and Brill don’t replace the ligature with a single glyph,
but replace the first glyph (only, as far as I know).

I don’t know which is the way to solve it, but this might be the cause.

Just in case it helps,

Pablo
-- 
http://www.ousia.tk
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Re: ligature exceptions

[Henning Hraban Ramm]

Am 2017-10-07 um 21:21 schrieb Pablo Rodriguez <oinos@gmx.es>:

> Both Alegreya and Brill don’t replace the ligature with a single glyph,
> but replace the first glyph (only, as far as I know).
> 
> I don’t know which is the way to solve it, but this might be the cause.

Oh, yes. Thanks for the analysis. I get the startligature-f also on hyphenation, like in auf-fällig, so that the arc of the first f (that is supposed to touch the second) reaches over the hyphen.


Greetlings, Hraban
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Re: ligature exceptions

[Hans Hagen]

On 10/7/2017 9:21 PM, Pablo Rodriguez wrote:
> On 10/07/2017 01:25 PM, Henning Hraban Ramm wrote:
>> I rejoiced too early:
>> While the ligature exception handling works with some of the default
>> fonts (lm, termes, pagella), it fails with the Alegreya fonts that I’m
>> using.

forget about Algreya as it's a useless font ... it has no kerns, no 
ligatures, no features at all so the f an whatever follows will always 
touch or overlap due to the design

Hans

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Re: ligature exceptions

[Pablo Rodriguez]

On 10/08/2017 12:14 AM, Hans Hagen wrote:
> On 10/7/2017 9:21 PM, Pablo Rodriguez wrote:
> [...]
> forget about Algreya as it's a useless font ... it has no kerns, no 
> ligatures, no features at all so the f an whatever follows will always 
> touch or overlap due to the design

In fact, the full version is a commercial typeface:
https://www.myfonts.com/fonts/huertatipografica/alegreya-ht-pro/.

I wonder whether it makes sense to have a free font that only contains
the shapes and just nothing more.

Pablo
-- 
http://www.ousia.tk
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Re: ligature exceptions

[Henning Hraban Ramm]

Am 2017-10-08 um 00:14 schrieb Hans Hagen <pragma@wxs.nl>:

> On 10/7/2017 9:21 PM, Pablo Rodriguez wrote:
>> On 10/07/2017 01:25 PM, Henning Hraban Ramm wrote:
>>> I rejoiced too early:
>>> While the ligature exception handling works with some of the default
>>> fonts (lm, termes, pagella), it fails with the Alegreya fonts that I’m
>>> using.
> 
> forget about Algreya as it's a useless font ... it has no kerns, no ligatures, no features at all so the f an whatever follows will always touch or overlap due to the design

I can’t agree - it’s beautifully designed, and I can’t complain about its kerning. It also responds to tlig or liga features, even if they’re implemented as single (i.e. not ligature) glyphs (there are e.g. different f glyphs). Maybe it’s set up in a strange way, but I don’t think it’s that bad. Of course I don’t have your level of insight.

My problem with Alegreya’s *design* it just that it’s not very well suited for digital printing, it needs a high resolution to look good.

Greetlings, Hraban
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Re: ligature exceptions

[Hans Hagen]

On 10/7/2017 9:21 PM, Pablo Rodriguez wrote:

> The Brill fonts don’t work either (http://www.brill.com/about/brill-fonts).
> 
>      \definefontfamily[mainfont][rm][Alegreya]
>      \definefontfamily[otherfont][rm][Brill]
>      \setupbodyfont [mainfont,16pt]
> 
>      \starttext
>      \startTEXpage[offset=1em]
>      \startbuffer
>      falsch: Auflage Kampffront
> 
>      richtig: Au\noligature{fl}age Kamp\noligature{ff}ront
> 
>      \setreplacements[eka]
>      richtig: Auflage Kampffront
> 
>      f ft fl fk fb ff
> 
>      f f\/t f\/l f\/k f\/b f\/f
>      \resetreplacements
>      \stopbuffer
> 
>      \getbuffer
> 
>      \setupbodyfont[times]\getbuffer
> 
>      \setupbodyfont[otherfont]\getbuffer
>      \stopTEXpage
>      \stoptext
You need to define features before fonts get defined because we share 
font definitions and their features as much as possible

\startluacode
     fonts.handlers.otf.addfeature {
         name = "kernligatures",
         type = "kern",
         data = {
             f = { i = 50, l = 50 },
         }
     }
\stopluacode

\blockligatures[u:fl:a]

Now we can use them

\definefontfamily[mainfont][rm][Brill]
\definefontfamily[mainfont][tt][Dejavu]

\setupbodyfont[mainfont]

\definefontfeature[default:b][default][blockligatures=yes]
\definefontfeature[default:k][default][blockligatures=yes,kernligatures=yes]

\showfontkerns

\starttext

{\definedfont[Serif*default   @ 11pt]auflage}\par
{\definedfont[Serif*default:b @ 11pt]auflage}\par
{\definedfont[Serif*default:k @ 11pt]auflage}\par

\stoptext

so, you need to add a kern too because brill assumes ligatures to be applied

as usual with tex .. there's always a way out but not always a trivial 
one and of course all this gets forgotten and/or lost in the flood of 
solutions

Hans

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                                           Hans Hagen | PRAGMA ADE
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Re: ligature exceptions

[Pablo Rodriguez]

On 10/08/2017 12:22 AM, Hans Hagen wrote:
> You need to define features before fonts get defined because we share 
> font definitions and their features as much as possible
> 
> \startluacode
>      fonts.handlers.otf.addfeature {
>          name = "kernligatures",
>          type = "kern",
>          data = {
>              f = { i = 50, l = 50 },
>          }
>      }
> \stopluacode

Many thanks for your reply, Hans.

I almost get it all ;-), but what is the "i" variable?

Setting different values or even removing doesn’t make any difference
(at least, that I notice).

Many thanks for your help again,

Pablo
-- 
http://www.ousia.tk
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Re: ligature exceptions

[Henning Hraban Ramm]

Am 2017-10-08 um 10:37 schrieb Pablo Rodriguez <oinos@gmx.es>:

> On 10/08/2017 12:22 AM, Hans Hagen wrote:
>> You need to define features before fonts get defined because we share 
>> font definitions and their features as much as possible
>> 
>> \startluacode
>>     fonts.handlers.otf.addfeature {
>>         name = "kernligatures",
>>         type = "kern",
>>         data = {
>>             f = { i = 50, l = 50 },
>>         }
>>     }
>> \stopluacode
> 
> Many thanks for your reply, Hans.
> 
> I almost get it all ;-), but what is the "i" variable?

It defines the kerning between f and i. I also added "f" and "b".

And after playing with the values and setting up exceptions I understand now why Hans hates the Alegreya font(s):
While the kerning works, the font still uses the long-arced f (that is meant for creating ligatures).

I still like the design, but will consider different fonts for upcoming books.


Greetlings, Hraban
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Re: ligature exceptions

[Pablo Rodriguez]

On 10/08/2017 02:54 PM, Henning Hraban Ramm wrote:
> Am 2017-10-08 um 10:37 schrieb Pablo Rodriguez:
>> On 10/08/2017 12:22 AM, Hans Hagen wrote:
>> Many thanks for your reply, Hans.
>>
>> I almost get it all ;-), but what is the "i" variable?
> 
> It defines the kerning between f and i. I also added "f" and "b".

Many thanks for the replies, both Hans and Hraban.

I didn’t notice any change in my sample because I only tested the fl pair.

Many thanks for your help,

Pablo
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Re: ligature exceptions

[Henning Hraban Ramm]

Am 2017-10-08 um 00:22 schrieb Hans Hagen <pragma@wxs.nl>:

> On 10/7/2017 9:21 PM, Pablo Rodriguez wrote:
> You need to define features before fonts get defined because we share font definitions and their features as much as possible
> 
> \startluacode
>    fonts.handlers.otf.addfeature {
>        name = "kernligatures",
>        type = "kern",
>        data = {
>            f = { i = 50, l = 50 },
>        }
>    }
> \stopluacode
> 
> \blockligatures[u:fl:a]
> 
> Now we can use them
> 
> \definefontfamily[mainfont][rm][Brill]
> \definefontfamily[mainfont][tt][Dejavu]
> 
> \setupbodyfont[mainfont]
> 
> \definefontfeature[default:b][default][blockligatures=yes]
> \definefontfeature[default:k][default][blockligatures=yes,kernligatures=yes]

Thank you very much, that helps! I’m working on a set of exceptions...



Greetlings, Hraban
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