Re: simple question on kerning activation

From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: "Pablo Rodríguez" <oinos@web.de>
Subject: Re: simple question on kerning activation
Date: Mon, 26 Nov 2012 23:46:36 +0100	[thread overview]
Message-ID: <50B3F14C.3070101@wxs.nl> (raw)
In-Reply-To: <50B3E772.3040606@web.de>

On 11/26/2012 11:04 PM, Pablo Rodríguez wrote:
> On 26/11/12 21:39, Hans Hagen wrote:
>> On 11/26/2012 8:01 PM, Pablo Rodríguez wrote:
>>> Sorry for the stupid question: isn't it font kerning (not kern OT table,
>>> but traditional non-OT kerning) enabled when compiling this source?
>>
>> kerning is *always* driven by the font, given that the font has kerns
>> (not all fonts need them)
>
> Thanks for your reply, Hans.
>
> Sorry, my question was inaccurate.
>
> I know that kerning information is in the font, but it is ConTeXt that
> uses this information (or not).
>
> As far as I know, there are two kinds of kerningns: an OT kern feature
> from the GPOS table and an old TrueType 'kern' table.
>
> In the following sample OpenType features aren't enabled:
>
> \usemodule[simplefonts][size=30pt]
> \setmainfont[FreeSerif]
> \starttext
> dadedidodufafefifofufrflftlalelilolutatetitotu\par
> {\em dadedidodufafefifofufrflftlalelilolutatetitotu\par}
> {\bf dadedidodufafefifofufrflftlalelilolutatetitotu\par}
> {\bf\em dadedidodufafefifofufrflftlalelilolutatetitotu\par}
> \stoptext
>
> I'm using TrueType fonts of FreeSerif. Isn't the TrueType 'kern' enabled
> by default in ConTeXt? (The glyphs in the example above have no kerning
> at all, so I wonder whether at least the TrueType 'kern' table should be
> used by ConTeXt.)

Sure, kern tables are used and are quite valid in open type as well 
(open type includes truetype).

I see lots of kerns in:

\starttext

     \startTEXpage[offset=10pt]

         \definedfont[file:freeserif.ttf*default] \showfontkerns \input ward

     \stopTEXpage

\stoptext

I assume simplefonts uses the default featureset

Hans

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