On 12/26/2019 1:41 PM, Rik Kabel wrote:
Okay, I have progressed further but have run into something (else) I
cannot understand. Consider the following example:
\definefontfeature [myserif] [mode=node,kern=yes,xkern=yes]
\definefontfeature [mysans] [mode=node,kern=yes,xkern=no]
\definefontfeature [none] [mode=node]
\definefontfamily [mykerns] [serif] [Baskervaldx] [features=myserif]
\definefontfamily [mykerns] [sans] [Dejavusans] [features=mysans]
\definefontfamily [default] [serif] [Baskervaldx] [features=default]
\definefontfamily [default] [sans] [Dejavusans] [features=default]
\definefontfamily [nokerns] [serif] [Baskervaldx] [features=none]
\definefontfamily [nokerns] [sans] [Dejavusans] [features=none]
\definefontfamily [legends] [mono] [Dejavusansmono] [features=default]
\startluacode
fonts.handlers.otf.addfeature {
name = "kern",
type = "kern",
data = {
["x"] = { ["x"] = -300 },
[" "] = { ["A"] = 1000 }
}
}
fonts.handlers.otf.addfeature {
name = "xkern",
type = "kern",
data = {
["x"] = { ["x"] = 500 },
[" "] = { ["J"] = 500 }
}
}
\stopluacode
\startbuffer[Sample]
g, Jaxxb AJon
\stopbuffer
\define[2]\Test{
{\switchtobodyfont[#1]#2\getbuffer[Sample]}}
\setupbodyfont[legends]
\starttext
\starttabulate[|l|l|l|]
\NC test \NC Serif \NC Sans \NC \NR
\NC nokerns \NC \Test{nokerns}{\tf} \NC \Test{nokerns}{\ss} \NC \NR
\NC default \NC \Test{default}{\tf} \NC \Test{default}{\ss} \NC \NR
\NC mykerns \NC \Test{mykerns}{\tf} \NC \Test{mykerns}{\ss} \NC \NR
\stoptabulate
\stoptext
It shows, as far as I see, that the kern feature type supports " ", but
only when it is named kern. When it is named xkern, as here, it does not
support spaces, but does support other characters.
Indeed it's currently bound to 'kern' (mostly for convenience and a
little for performance) but it's not that hard to make it a bit more
flexible (but not today).
Hans
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