Re: Adjust kern for one character

[Rik Kabel <ConTeXt@rik.users.panix.com>]

On 12/26/2019 08:40, Hans Hagen wrote:
> 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
>
Thank you for the confirmation. I look forward to the update.

-- 
Rik

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