[NTG-context] fallbacks

[NTG-context] fallbacks

[Thomas A. Schmitz via ntg-context]

Hi all,

today, I was struggling with a fallback font I had defined, and I 
discovered that the key "check" doesn't work as I expected. Here's a 
small example:

\definefallbackfamily [presentation] [serif] [TeXGyreTermes] 
[range=0x2329-0x232A,check=yes]
\definefontfamily [presentation] [serif] [AntykwaTorunska]
\setupbodyfont [presentation,12pt]

\starttext

(〈P〉)

\stoptext

With this input, the two characters 〈 and 〉 are not typeset; in the log, 
I find

fonts           > checking > char 〈 (U+02329) in font 
'AntykwaTorunska-Regular' with id 1: missing
fonts           > checking > char 〉 (U+0232A) in font 
'AntykwaTorunska-Regular' with id 1: missing

If I have "check=no," the characters are taken from termes and replaced. 
I was under the impression that "check" should, well, check if the 
characters are not in the main font and fall back to the fallback font 
if they are not, but this doesn't appear to be the case. So what does 
"check" do? Or is this a bug?

Have a great weekend

Thomas
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Re: [NTG-context] fallbacks

[Pablo Rodriguez via ntg-context]

On 4/22/23 18:05, Thomas A. Schmitz via ntg-context wrote:
> Hi all,
> 
> today, I was struggling with a fallback font I had defined, and I 
> discovered that the key "check" doesn't work as I expected.
> [...] 
> If I have "check=no," the characters are taken from termes and replaced. 
> I was under the impression that "check" should, well, check if the 
> characters are not in the main font and fall back to the fallback font
> if they are not, but this doesn't appear to be the case.

Hi Thomas,

I don’t know what check does (maybe just check?), but the standard
behaviour with \definefallbackfamily is only to fall back when the
character is missing from the main font.

To force all characters from the range in the fallback font, "force=yes"
is required.

Here you have a minimal sample (which doesn‘t use "preset=range:greek"),
adding "force=yes" gets all Greek glyphs from GFS Heraklit:

  \definefallbackfamily [presentation] [serif] [GFSHeraklit]
  [range={greekandcoptic, greekextended}]
  \definefontfamily [presentation] [serif] [TeXGyrePagella]
  \setupbodyfont [presentation,12pt]

  \starttext
  Pπμᾷσδ
  \stoptext

Just in case it might help,

Pablo
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Re: [NTG-context] fallbacks

[Thomas A. Schmitz via ntg-context]

Thank you, Pablo, but that doesn't help. I know how to use fallback 
fonts. I was wondering if the check key is working as it should.

Thomas

On 4/22/23 20:33, Pablo Rodriguez via ntg-context wrote:
> Hi Thomas,
> 
> I don’t know what check does (maybe just check?), but the standard
> behaviour with \definefallbackfamily is only to fall back when the
> character is missing from the main font.
> 
> To force all characters from the range in the fallback font, "force=yes"
> is required.
> 
> Here you have a minimal sample (which doesn‘t use "preset=range:greek"),
> adding "force=yes" gets all Greek glyphs from GFS Heraklit:
> 
>    \definefallbackfamily [presentation] [serif] [GFSHeraklit]
>    [range={greekandcoptic, greekextended}]
>    \definefontfamily [presentation] [serif] [TeXGyrePagella]
>    \setupbodyfont [presentation,12pt]
> 
>    \starttext
>    Pπμᾷσδ
>    \stoptext
> 
> Just in case it might help,

-- 
Prof. Dr. Thomas A. Schmitz
Institut für Klassische und Romanische Philologie
Universität Bonn
Am Hof 1e
53113 Bonn
http://www.philologie.uni-bonn.de/de/personal/schmitz

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Re: [NTG-context] fallbacks

[Sylvain Hubert via ntg-context]

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I believe it's a bug.

https://github.com/contextgarden/context/blob/d025bcdf995be6951f69fed6869048ab22491b9e/tex/context/base/mkxl/font-col.lmt#L278

the newchar[] table, which should contain all chars supported by the
fallback termes font if I'm not mistaken, turns out to have only 392 chars
within 0x20-0x30C, far away from 0x2329-0x232A.

On Sun, 23 Apr 2023 at 03:26, Thomas A. Schmitz via ntg-context <
ntg-context@ntg.nl> wrote:

> Thank you, Pablo, but that doesn't help. I know how to use fallback
> fonts. I was wondering if the check key is working as it should.
>
> Thomas
>
> On 4/22/23 20:33, Pablo Rodriguez via ntg-context wrote:
> > Hi Thomas,
> >
> > I don’t know what check does (maybe just check?), but the standard
> > behaviour with \definefallbackfamily is only to fall back when the
> > character is missing from the main font.
> >
> > To force all characters from the range in the fallback font, "force=yes"
> > is required.
> >
> > Here you have a minimal sample (which doesn‘t use "preset=range:greek"),
> > adding "force=yes" gets all Greek glyphs from GFS Heraklit:
> >
> >    \definefallbackfamily [presentation] [serif] [GFSHeraklit]
> >    [range={greekandcoptic, greekextended}]
> >    \definefontfamily [presentation] [serif] [TeXGyrePagella]
> >    \setupbodyfont [presentation,12pt]
> >
> >    \starttext
> >    Pπμᾷσδ
> >    \stoptext
> >
> > Just in case it might help,
>
> --
> Prof. Dr. Thomas A. Schmitz
> Institut für Klassische und Romanische Philologie
> Universität Bonn
> Am Hof 1e
> 53113 Bonn
> http://www.philologie.uni-bonn.de/de/personal/schmitz
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> https://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : https://contextgarden.net
>
> ___________________________________________________________________________________
>

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