Re: mkiv and non-universal sans-serif kerning

[Hans Hagen <pragma@wxs.nl>]

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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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