mkiv and non-universal sans-serif kerning

mkiv and non-universal sans-serif kerning

[Ondřej Hošek]

Greetings,

long-time reader, first-time writer here. I've been using ConTeXt for
about a year and, until now, been able to solve all my problems using
the wiki or the mailing list, so a "keep up the good work!" is
certainly in order. ;-)

My problem concerns kerning in mkiv, which apparently doesn't work for
all sans-serif fonts. It does seem to work for TeX Gyre Heros and
Latin Modern Sans, but not, as an example of a font shipped with
ConTeXt, DejaVu.

Here's a short testcase:

\usetypescript[dejavu]
\setupbodyfont[dejavu,12pt,rm]

\starttext

Token (kerned)

T{\char"200C}oken (unkerned)

{\ss Token (kerned)}

{\ss T{\char"200C}oken (unkerned)}

\stoptext

(U+200C is the "zero width non-joiner", rather useful as an invisible
breaker of kerns and ligatures.)

Expected behavior: first line "To" kerned, second line "To" not
kerned, third line "To" kerned, fourth line "To" not kerned.

Differences to expected behavior on my machine (ConTeXt minimals
2011.07.22 01:29): third line "To" not kerned either.

Thanks for the assistance in advance!

Cheers,
~~ Ondra Hošek
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Re: mkiv and non-universal sans-serif kerning

[Hans Hagen]

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On 22-7-2011 2:56, Ondřej Hošek wrote:
> Greetings,
>
> long-time reader, first-time writer here. I've been using ConTeXt for
> about a year and, until now, been able to solve all my problems using
> the wiki or the mailing list, so a "keep up the good work!" is
> certainly in order. ;-)
>
> My problem concerns kerning in mkiv, which apparently doesn't work for
> all sans-serif fonts. It does seem to work for TeX Gyre Heros and
> Latin Modern Sans, but not, as an example of a font shipped with
> ConTeXt, DejaVu.
>
> Here's a short testcase:
>
> \usetypescript[dejavu]
> \setupbodyfont[dejavu,12pt,rm]
>
> \starttext
>
> Token (kerned)
>
> T{\char"200C}oken (unkerned)
>
> {\ss Token (kerned)}
>
> {\ss T{\char"200C}oken (unkerned)}
>
> \stoptext
>
> (U+200C is the "zero width non-joiner", rather useful as an invisible
> breaker of kerns and ligatures.)

\zwnj

> Expected behavior: first line "To" kerned, second line "To" not
> kerned, third line "To" kerned, fourth line "To" not kerned.

works ok here

> Differences to expected behavior on my machine (ConTeXt minimals
> 2011.07.22 01:29): third line "To" not kerned either.

the current version has some heuristics for mode (some fonts need node 
mode) and script/language (some fonts don't have dflt defined)

Hans

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___________________________________________________________________________________
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
___________________________________________________________________________________

Re: mkiv and non-universal sans-serif kerning

[Ondřej Hošek]

On Fri, Jul 22, 2011 at 21:28, Hans Hagen <pragma@wxs.nl> wrote:
> the current version has some heuristics for mode (some fonts need node mode)
> and script/language (some fonts don't have dflt defined)

Ah, thanks for the hint. Explicitly setting "script=latn" in the
default font feature solves the problem.

Cheers,
~~ Ondra
___________________________________________________________________________________
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
___________________________________________________________________________________