Font fallbacks

Font fallbacks

[Wolfgang Schuster]

Hi,

the \definefontfallback commands use only the last setting in a comma
seperated list.

In this example only characters from 0x0071 to 0x0081 are set in bolditalic.

\definefontfallback [whatever] [BoldItalic] [0x0041-0x0051,0x0071-0x0081]

\definefontsynonym[SerifPlus][Serif][fallbacks=whatever]

\definefont[MySerif][SerifPlus]

\starttext

\MySerif

\dostepwiserecurse{65}{255}{1}
    {\char\recurselevel\hskip10pt plus 5pt\relax}

\stoptext

Wolfgang
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Re: Font fallbacks

[Hans Hagen]

Wolfgang Schuster wrote:
> Hi,
> 
> the \definefontfallback commands use only the last setting in a comma
> seperated list.

fixed (it needed a deep copy of tables)


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Re: font fallbacks

[Henning Hraban Ramm via ntg-context]

Am 01.08.22 um 20:43 schrieb denis.maier@unibe.ch:
> Hi,
> I have used more than one fallback, but each fallback is for a different character range

Thank you.

I tried:

\definefontfallback[seguiFB]
   [file:seguisym.ttf]
%  [0x00000-0xFFFFF]
   [0x0007F-0xFFFFF]
   [check=yes,force=no]

\definefontfallback[tildeFB]
   [file:seguisym.ttf]
   [0x0007E-0x0007E]
   [force=yes]

\definetypeface [start] [tt] [mono]  [modern] 
[default][fallbacks={tildeFB}] % ,seguiFB


I can either replace the one character or fall back for all missing 
characters, but not both. Maybe it’s the mixture of force=yes/no.

For the emoji fallback, I’d need to define all the necessary ranges...

Hraban
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Re: font fallbacks

[Denis Maier via ntg-context]

Hi,
I have used more than one fallback, but each fallback is for a different character range
Denis
________________________________________
Von: ntg-context <ntg-context-bounces@ntg.nl> im Auftrag von Henning Hraban Ramm via ntg-context <ntg-context@ntg.nl>
Gesendet: Montag, 1. August 2022 19:42:51
An: Henning Hraban Ramm via ntg-context
Cc: Henning Hraban Ramm
Betreff: Re: [NTG-context] font fallbacks

Nobody?
I couldn’t find an example of more than one fallback, so I guess that’s
not supported?

Hraban

Am 30.07.22 um 15:51 schrieb Henning Hraban Ramm via ntg-context:
> Hi,
> I thought I could use more than one fallback font, but as soon as I list
> fallbacks, they stop working.
>
> In my example, I’d like to take all missing glyphs from Segoe UI
> Symbols, and what’s still missing (emojis) from EmojiOneColor,
> preferably without specifying the exact range.
>
> Additionally, I want to replace the tilde ~ of LM Modern:
>
> """
> \definefontfallback[seguiFB]
>    [file:seguisym.ttf]
>    [0x00000-0xFFFFF]
>    [check=yes,force=no]
>
> \definefontfallback[emoneFB]
>    [name:EmojiOneColor]
>    [0x00000-0xFFFFF]
>    [check=yes,force=no]
>
> % replace tilde in LM
> \definefontfallback[tildeFB]
>    [file:seguisym.ttf]
>    [0x0007E-0x0007E]
>    [force=yes]
>
>
> \starttypescript [start]
>    \definetypeface [start] [rm] [serif] [cambria]
> [default][fallbacks={seguiFB,emoneFB}]
>    \definetypeface [start] [ss] [sans]  [modern]
> [default][fallbacks={seguiFB,emoneFB}]
>    \definetypeface [start] [tt] [mono]  [modern]
> [default][fallbacks={seguiFB,tildeFB,emoneFB}]
>    \definetypeface [start] [mm] [math]  [modern]
> [default][fallbacks={seguiFB,emoneFB}]
> \stoptypescript
>
>
> \setupbodyfont[start,rm,12pt]
>
> \starttext
>
> \Omega\ (Omega) and \aleph\ (Aleph)
>
> \startbuffer[example]
> start missing characters: lmmono10-regular.otf
>     7  U+00327  ̧  COMBINING CEDILLA
>     7  U+00335  ̵  COMBINING SHORT STROKE OVERLAY
>    14  U+003B7  η  GREEK SMALL LETTER ETA
>     7  U+021A9  ↩  LEFTWARDS ARROW WITH HOOK
>   350  U+02500  ─  BOX DRAWINGS LIGHT HORIZONTAL
>    98  U+02502  │  BOX DRAWINGS LIGHT VERTICAL
>    42  U+02514  └  BOX DRAWINGS LIGHT UP AND RIGHT
>   133  U+0251C  ├  BOX DRAWINGS LIGHT VERTICAL AND RIGHT
>   154  U+02772  ❲  LIGHT LEFT TORTOISE SHELL BRACKET ORNAMENT
>   154  U+02773  ❳  LIGHT RIGHT TORTOISE SHELL BRACKET ORNAMENT
>    14  U+0278A  ➊  DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE
> stop missing characters
> start missing characters: cambria.ttc
>     9  U+0278A  ➊  DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE
>     9  U+0FFFD  �  REPLACEMENT CHARACTER
> stop missing characters
> start missing characters: cambriai.ttf
>   266  U+0276C  ❬  MEDIUM LEFT-POINTING ANGLE BRACKET ORNAMENT
>   266  U+0276D  ❭  MEDIUM RIGHT-POINTING ANGLE BRACKET ORNAMENT
> stop missing characters
> \stopbuffer
>
> \typebuffer[example]
>
> \startlines
> \getbuffer[example]
>
> {\ss\getbuffer[example]}
> \stoplines
>
> \tex{abra}\arg{...}
> \type{kadabra} \type{~~~}
>
> \stoptext
> """
>
> What’s wrong?
>
> Hraban
> ___________________________________________________________________________________
> 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
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> wiki     : https://contextgarden.net
> ___________________________________________________________________________________

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Re: font fallbacks

[Henning Hraban Ramm via ntg-context]

Nobody?
I couldn’t find an example of more than one fallback, so I guess that’s 
not supported?

Hraban

Am 30.07.22 um 15:51 schrieb Henning Hraban Ramm via ntg-context:
> Hi,
> I thought I could use more than one fallback font, but as soon as I list 
> fallbacks, they stop working.
> 
> In my example, I’d like to take all missing glyphs from Segoe UI 
> Symbols, and what’s still missing (emojis) from EmojiOneColor, 
> preferably without specifying the exact range.
> 
> Additionally, I want to replace the tilde ~ of LM Modern:
> 
> """
> \definefontfallback[seguiFB]
>    [file:seguisym.ttf]
>    [0x00000-0xFFFFF]
>    [check=yes,force=no]
> 
> \definefontfallback[emoneFB]
>    [name:EmojiOneColor]
>    [0x00000-0xFFFFF]
>    [check=yes,force=no]
> 
> % replace tilde in LM
> \definefontfallback[tildeFB]
>    [file:seguisym.ttf]
>    [0x0007E-0x0007E]
>    [force=yes]
> 
> 
> \starttypescript [start]
>    \definetypeface [start] [rm] [serif] [cambria] 
> [default][fallbacks={seguiFB,emoneFB}]
>    \definetypeface [start] [ss] [sans]  [modern] 
> [default][fallbacks={seguiFB,emoneFB}]
>    \definetypeface [start] [tt] [mono]  [modern] 
> [default][fallbacks={seguiFB,tildeFB,emoneFB}]
>    \definetypeface [start] [mm] [math]  [modern] 
> [default][fallbacks={seguiFB,emoneFB}]
> \stoptypescript
> 
> 
> \setupbodyfont[start,rm,12pt]
> 
> \starttext
> 
> \Omega\ (Omega) and \aleph\ (Aleph)
> 
> \startbuffer[example]
> start missing characters: lmmono10-regular.otf
>     7  U+00327  ̧  COMBINING CEDILLA
>     7  U+00335  ̵  COMBINING SHORT STROKE OVERLAY
>    14  U+003B7  η  GREEK SMALL LETTER ETA
>     7  U+021A9  ↩  LEFTWARDS ARROW WITH HOOK
>   350  U+02500  ─  BOX DRAWINGS LIGHT HORIZONTAL
>    98  U+02502  │  BOX DRAWINGS LIGHT VERTICAL
>    42  U+02514  └  BOX DRAWINGS LIGHT UP AND RIGHT
>   133  U+0251C  ├  BOX DRAWINGS LIGHT VERTICAL AND RIGHT
>   154  U+02772  ❲  LIGHT LEFT TORTOISE SHELL BRACKET ORNAMENT
>   154  U+02773  ❳  LIGHT RIGHT TORTOISE SHELL BRACKET ORNAMENT
>    14  U+0278A  ➊  DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE
> stop missing characters
> start missing characters: cambria.ttc
>     9  U+0278A  ➊  DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE
>     9  U+0FFFD  �  REPLACEMENT CHARACTER
> stop missing characters
> start missing characters: cambriai.ttf
>   266  U+0276C  ❬  MEDIUM LEFT-POINTING ANGLE BRACKET ORNAMENT
>   266  U+0276D  ❭  MEDIUM RIGHT-POINTING ANGLE BRACKET ORNAMENT
> stop missing characters
> \stopbuffer
> 
> \typebuffer[example]
> 
> \startlines
> \getbuffer[example]
> 
> {\ss\getbuffer[example]}
> \stoplines
> 
> \tex{abra}\arg{...}
> \type{kadabra} \type{~~~}
> 
> \stoptext
> """
> 
> What’s wrong?
> 
> Hraban
> ___________________________________________________________________________________
> 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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___________________________________________________________________________________

font fallbacks

[Henning Hraban Ramm via ntg-context]

Hi,
I thought I could use more than one fallback font, but as soon as I list 
fallbacks, they stop working.

In my example, I’d like to take all missing glyphs from Segoe UI 
Symbols, and what’s still missing (emojis) from EmojiOneColor, 
preferably without specifying the exact range.

Additionally, I want to replace the tilde ~ of LM Modern:

"""
\definefontfallback[seguiFB]
   [file:seguisym.ttf]
   [0x00000-0xFFFFF]
   [check=yes,force=no]

\definefontfallback[emoneFB]
   [name:EmojiOneColor]
   [0x00000-0xFFFFF]
   [check=yes,force=no]

% replace tilde in LM
\definefontfallback[tildeFB]
   [file:seguisym.ttf]
   [0x0007E-0x0007E]
   [force=yes]


\starttypescript [start]
   \definetypeface [start] [rm] [serif] [cambria] 
[default][fallbacks={seguiFB,emoneFB}]
   \definetypeface [start] [ss] [sans]  [modern] 
[default][fallbacks={seguiFB,emoneFB}]
   \definetypeface [start] [tt] [mono]  [modern] 
[default][fallbacks={seguiFB,tildeFB,emoneFB}]
   \definetypeface [start] [mm] [math]  [modern] 
[default][fallbacks={seguiFB,emoneFB}]
\stoptypescript


\setupbodyfont[start,rm,12pt]

\starttext

\Omega\ (Omega) and \aleph\ (Aleph)

\startbuffer[example]
start missing characters: lmmono10-regular.otf
    7  U+00327  ̧  COMBINING CEDILLA
    7  U+00335  ̵  COMBINING SHORT STROKE OVERLAY
   14  U+003B7  η  GREEK SMALL LETTER ETA
    7  U+021A9  ↩  LEFTWARDS ARROW WITH HOOK
  350  U+02500  ─  BOX DRAWINGS LIGHT HORIZONTAL
   98  U+02502  │  BOX DRAWINGS LIGHT VERTICAL
   42  U+02514  └  BOX DRAWINGS LIGHT UP AND RIGHT
  133  U+0251C  ├  BOX DRAWINGS LIGHT VERTICAL AND RIGHT
  154  U+02772  ❲  LIGHT LEFT TORTOISE SHELL BRACKET ORNAMENT
  154  U+02773  ❳  LIGHT RIGHT TORTOISE SHELL BRACKET ORNAMENT
   14  U+0278A  ➊  DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE
stop missing characters
start missing characters: cambria.ttc
    9  U+0278A  ➊  DINGBAT NEGATIVE CIRCLED SANS-SERIF DIGIT ONE
    9  U+0FFFD  �  REPLACEMENT CHARACTER
stop missing characters
start missing characters: cambriai.ttf
  266  U+0276C  ❬  MEDIUM LEFT-POINTING ANGLE BRACKET ORNAMENT
  266  U+0276D  ❭  MEDIUM RIGHT-POINTING ANGLE BRACKET ORNAMENT
stop missing characters
\stopbuffer

\typebuffer[example]

\startlines
\getbuffer[example]

{\ss\getbuffer[example]}
\stoplines

\tex{abra}\arg{...}
\type{kadabra} \type{~~~}

\stoptext
"""

What’s wrong?

Hraban
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Font Fallbacks

[Mathias Schickel]

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Dear ConTeXt users,

I have a question concerning font fallbacks in math fonts. I have not been able to find an option to specify optical sizes in fallbacks. I want to use Minion Math for the alphabetical symbols, and this font ships with single font files for each optical size. So I am searching for the right command to get for example the following behaviour:

Use the CambriaMath fonts for mathematical symbols and use Minion Math (Minion-Math-Regular.otf for standard size, Minion-Math-Caption.otf for indices and Minion-Math-Tiny for sub-indices) for alphabetical symbols.

Can anyone tell me which commands I have to use to achieve this?

So the general question is paraphrased as follows: Use some font as a general math font (here CambriaMath) and replace some symbols out of another fonts that ships with single files for each optical size.

One remark about that: Minion Math has supporting mkiv-files. So you can use this font (specifying all optical sizes) by writing \setupbodyfont[minion]. One could make use of that and maybe use a command like

\definefamilyfallback[MathFallback][family:minion][<range of symbols to be replaced>][force=yes].

As far as I know a command like that does not exist at present. Maybe it could be designed to take use of existing font definition files.

And I have some similar problem: I do not like the mathematical symbols of the STIX2 fonts that much (since they are mainly taken from STIX1) and let us suppose now that I want to use again CambriaMath instead for mathematical symbols. I was able to figure out the following commands that nearly achieve what I want to get:

\definefontfallback[MathFallback][file:STIX2Math.otf][lowercasescript,uppercasescript,lowercasefraktur,uppercasefraktur][force=yes]
%
\starttypescriptcollection[stix2own]
	%
	\starttypescript [\s!math][stix2own][\s!all]
        \loadfontgoodies[cambria-math]
        \definefontsynonym[\s!MathRoman] [Cambria-Math]	[\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!fallbacks={MathFallback},\s!goodies=cambria-math]
   	 \stoptypescript
	%
	\starttypescript [stix2own]
        	\definetypeface [\typescriptone] [\s!mm] [\s!math]  [stix2own] [\s!default]
	\stoptypescript
	%
\stoptypescriptcollection

This font can be used by the command \setupbodyfont[stix2own].

The only problem is that STIX2 has design sizes embedded in the file STIX2Math.otf that are used if I am using this file as whole for math, but that are not used any longer using the mechanism defined above. That means: If I use Cambria as Math font and replace the alphabetical symbols out of STIX2Math.otf the optical sizes for indices are not used any longer.

What can be done to solve this second problem?

One last question remains: I dislike the summation symbol of CambriaMath (because it is too large in my eyes) and this is why I want to replace it by the version of STIX2Math again (this symbols is indeed redesigned in STIX2Math and looks very nice in my eyes). So I could add a second font fallback that should be applied besides the one above. The unicode slot of the summation symbol is 0x2211in STIX2Math. So I could define

\definefontfallback[SummationFallback][file:STIX2Math.otf][0x2211][force=yes]

and pass it as a second fallback as follows (changing the following line in the example above):

\definefontsynonym[\s!MathRoman] [Cambria-Math]	[\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!fallbacks={MathFallback,SummationFallback},\s!goodies=cambria-math]

The problem is that only one of those fallbacks is used if I pass two arguments for fallbacks. Of course this problem can be solved easily if I add the summation symbol to the list of replaced symbols in the first fallback definition. But if I want to use a summation symbol out of another font this trick does not work any longer.

Besides there is a second problem in replacing the summation symbol in the way described: Every time I am using $\sum$, ConTeXt uses the bigger symbol designed for displayed formulas and not the one designed for inline formulas. How can I solve this problem?

Thank you very much for your assistance! If running minimal examples are required I can of course provide them. But I hope someone understands the fallback mechanism better than I do and then the minimal examples written by me would be obsolete (besides the require some font definition files which makes them more of less a little complex). Besides because of Minion Math is commercial not everyone owns this font an thus is unable to run the minimal example.

Kind regards
Mathias


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