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if not modules then modules = { } end modules ['typo-fkr'] = {
version = 1.001,
comment = "companion to typo-fkr.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local nuts = nodes.nuts
local tonut = nuts.tonut
local getid = nuts.getid
local getnext = nuts.getnext
local getchar = nuts.getchar
local getfont = nuts.getfont
local getattr = nuts.getattr
local nodecodes = nodes.nodecodes
local glyph_code = nodecodes.glyph
local fontdata = fonts.hashes.identifiers
local getkernpair = fonts.handlers.otf.getkern
local insert_before = nuts.insert_before
local new_kern = nuts.pool.fontkern
local a_extrakern = attributes.private("extrafontkern")
-- 0=none 1=min 2=max 3=mixed
typesetters.fontkerns = { }
function typesetters.fontkerns.handler(head)
local kepthead = head
local head = tonut(head)
local current = head
local lastfont = nil
local lastchar = nil
local lastdata = nil
local done = false
while current do
local id = getid(current)
if id == glyph_code then
local a = getattr(current,a_extrakern)
if a then
local char = getchar(current)
local font = getfont(current)
if font ~= lastfont then
if a > 0 and lastchar then
if not lastdata then
lastdata = fontdata[lastfont]
end
local kern = nil
local data = fontdata[font]
local kern1 = getkernpair(lastdata,lastchar,char)
local kern2 = getkernpair(data,lastchar,char)
if a == 1 then
kern = kern1 > kern2 and kern2 or kern1 -- min
elseif a == 2 then
kern = kern1 > kern2 and kern1 or kern2 -- max
else -- 3
kern = (kern1 + kern2)/2 -- mixed
end
if kern ~= 0 then
head, current = insert_before(head,current,new_kern(kern))
done = true
end
lastdata = data
else
lastdata = nil
end
elseif lastchar then
if not lastdata then
lastdata = fontdata[lastfont]
end
local kern = getkernpair(lastdata,lastchar,char)
if kern ~= 0 then
head, current = insert_before(head,current,new_kern(kern))
done = true
end
end
lastchar = char
lastfont = font
elseif lastfont then
lastfont = nil
lastchar = nil
lastdata = nil
end
elseif lastfont then
lastfont = nil
lastchar = nil
lastdata = nil
end
current = getnext(current)
end
return kepthead, done
end
if context then
local variables = interfaces.variables
local unsetvalue = attributes.unsetvalue
local enabled = false
local setattribute = tex.setattribute
local values = {
[variables.none ] = 0,
[variables.min ] = 1,
[variables.max ] = 2,
[variables.mixed] = 3,
[variables.reset] = unsetvalue,
}
local function setextrafontkerns(str)
if not enabled then
nodes.tasks.enableaction("processors","typesetters.fontkerns.handler")
enabled = true
end
setattribute(a_extrakern,values[str] or unsetvalue)
end
interfaces.implement {
name = "setextrafontkerns",
arguments = "string",
actions = setextrafontkerns,
}
end
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