[NTG-context] Fwd: Kerning feature not working

30 Aug 2023


      -------- Forwarded Message --------
Subject: Re: [NTG-context] Kerning feature not working
Date: Wed, 30 Aug 2023 22:17:43 +0200
From: Hans Hagen 
To: Marcus Vinicius Mesquita 

On 8/30/2023 9:37 PM, Marcus Vinicius Mesquita wrote:
...
Dear List
In the MWE below, the kerning feature works OK for ebgaramonditalic
but not for ebgaramondregular.
How do I fix it?
I'm using ConTeXt version: 2023.08.27 13:48
\startluacode
     fonts.handlers.otf.addfeature {
         name = "kernit",
         type = "kern",
        nocheck = true,
         data = {
           [0x27E8] = { ["f"] = 300, ["ﬁ"] = 300, ["ﬂ"] = 300 }
         }
     }
\stopluacode
you need to know the code points and eb garamond is not so predictable 
(welcome to fonts ...)

\startluacode
     fonts.handlers.otf.addfeature {
         name = "kernit",
         type = "kern",
      nocheck = true,
         data = {
           [0x27E8] = {
                 ["f"]    = 300,
                 ["f_l"]  = 300,
                 ["f_i"]  = 300,
                 [0xFB01] = 300,
                 [0xFB02] = 300,
             }
         }
     }
\stopluacode
...
\definefontfeature[kernit][mode=node,kernit=yes]
\starttext
\definedfont[name:ebgaramondregular*default,kernit]
⟨f ile
⟨f lame
⟨file
⟨flame
\definedfont[name:ebgaramonditalic*default,kernit]
⟨f ile
⟨f lame
⟨file
⟨flame
\stoptext
but easier is this (an old mechanism, maybe time for an upgrade with 
merged vectors)
\definecharacterspacing [myspacing]

\setupcharacterspacing [myspacing] ["27E8] [right=0.25,alternative=1]
\setupcharacterspacing [myspacing] ["27E9] [left=0.25,alternative=1]

and then

\setcharacterspacing[myspacing]


Hans

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