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if not modules then modules = { } end modules ['font-ext'] = {
version = 1.001,
comment = "companion to font-ini.tex and hand-ini.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local byte = string.byte
-- -- -- -- -- --
-- expansion (hz)
-- -- -- -- -- --
fonts.expansions = fonts.expansions or { }
fonts.expansions.classes = fonts.expansions.classes or { }
fonts.expansions.vectors = fonts.expansions.vectors or { }
-- beware, pdftex itself uses percentages * 10
fonts.expansions.classes.preset = { stretch = 2, shrink = 2, step = .5, factor = 1 }
function commands.setupfontexpansion(class,settings)
aux.getparameters(fonts.expansions.classes,class,'preset',settings)
end
fonts.expansions.classes['quality'] = {
stretch = 2, shrink = 2, step = .5, vector = 'default', factor = 1
}
fonts.expansions.vectors['default'] = {
[byte('A')] = 0.5, [byte('B')] = 0.7, [byte('C')] = 0.7, [byte('D')] = 0.5, [byte('E')] = 0.7,
[byte('F')] = 0.7, [byte('G')] = 0.5, [byte('H')] = 0.7, [byte('K')] = 0.7, [byte('M')] = 0.7,
[byte('N')] = 0.7, [byte('O')] = 0.5, [byte('P')] = 0.7, [byte('Q')] = 0.5, [byte('R')] = 0.7,
[byte('S')] = 0.7, [byte('U')] = 0.7, [byte('W')] = 0.7, [byte('Z')] = 0.7,
[byte('a')] = 0.7, [byte('b')] = 0.7, [byte('c')] = 0.7, [byte('d')] = 0.7, [byte('e')] = 0.7,
[byte('g')] = 0.7, [byte('h')] = 0.7, [byte('k')] = 0.7, [byte('m')] = 0.7, [byte('n')] = 0.7,
[byte('o')] = 0.7, [byte('p')] = 0.7, [byte('q')] = 0.7, [byte('s')] = 0.7, [byte('u')] = 0.7,
[byte('w')] = 0.7, [byte('z')] = 0.7,
[byte('2')] = 0.7, [byte('3')] = 0.7, [byte('6')] = 0.7, [byte('8')] = 0.7, [byte('9')] = 0.7,
}
function fonts.initializers.common.expansion(tfmdata,value)
if value then
local class = fonts.expansions.classes[value]
if class then
local vector = fonts.expansions.vectors[class.vector]
if vector then
tfmdata.stretch = (class.stretch or 0) * 10
tfmdata.shrink = (class.shrink or 0) * 10
tfmdata.step = (class.step or 0) * 10
tfmdata.auto_expand = true
local factor = class.factor or 1
local data = characters.data
for i, chr in pairs(tfmdata.characters) do
local v = vector[i]
if not v then
local d = data[i]
if d then
local s = d.shcode
if not s then
-- sorry
elseif type(s) == "table" then
v = ((vector[s[1]] or 0) + (vector[s[#s]] or 0)) / 2
else
v = vector[s] or 0
end
end
end
if v and v ~= 0 then
chr.expansion_factor = v*factor
else -- can be option
chr.expansion_factor = factor
end
end
end
end
end
end
table.insert(fonts.manipulators,"expansion")
fonts.initializers.base.otf.expansion = fonts.initializers.common.expansion
fonts.initializers.node.otf.expansion = fonts.initializers.common.expansion
fonts.initializers.base.afm.expansion = fonts.initializers.common.expansion
fonts.initializers.node.afm.expansion = fonts.initializers.common.expansion
-- -- -- -- -- --
-- protrusion
-- -- -- -- -- --
fonts.protrusions = fonts.protrusions or { }
fonts.protrusions.classes = fonts.protrusions.classes or { }
fonts.protrusions.vectors = fonts.protrusions.vectors or { }
-- the values need to be revisioned
fonts.protrusions.classes.preset = { factor = 1 }
function commands.setupfontprotrusion(class,settings)
aux.getparameters(fonts.protrusions.classes,class,'preset',settings)
end
fonts.protrusions.classes['pure'] = {
vector = 'pure', factor = 1
}
fonts.protrusions.classes['punctuation'] = {
vector = 'punctuation', factor = 1
}
fonts.protrusions.classes['alpha'] = {
vector = 'alpha', factor = 1
}
fonts.protrusions.classes['quality'] = {
vector = 'quality', factor = 1
}
fonts.protrusions.vectors['pure'] = {
[0x002C] = { 0, 1 }, -- comma
[0x002E] = { 0, 1 }, -- period
[0x003A] = { 0, 1 }, -- colon
[0x003B] = { 0, 1 }, -- semicolon
[0x002D] = { 0, 1 }, -- hyphen
[0x2013] = { 0, 0.50 }, -- endash
[0x2014] = { 0, 0.33 }, -- emdash
}
fonts.protrusions.vectors['punctuation'] = {
[0x003F] = { 0, 0.20 }, -- ?
[0x00BF] = { 0, 0.20 }, -- ¿
[0x0021] = { 0, 0.20 }, -- !
[0x00A1] = { 0, 0.20 }, -- ¡
[0x0028] = { 0.05, 0 }, -- (
[0x0029] = { 0, 0.05 }, -- )
[0x005B] = { 0.05, 0 }, -- [
[0x005D] = { 0, 0.05 }, -- ]
[0x002C] = { 0, 0.70 }, -- comma
[0x002E] = { 0, 0.70 }, -- period
[0x003A] = { 0, 0.50 }, -- colon
[0x003B] = { 0, 0.50 }, -- semicolon
[0x002D] = { 0, 0.70 }, -- hyphen
[0x2013] = { 0, 0.30 }, -- endash
[0x2014] = { 0, 0.20 }, -- emdash
-- todo: left and right quotes: .5 double, .7 single
}
fonts.protrusions.vectors['alpha'] = {
[byte("A")] = { .05, .05 },
[byte("F")] = { 0, .05 },
[byte("J")] = { .05, 0 },
[byte("K")] = { 0, .05 },
[byte("L")] = { 0, .05 },
[byte("T")] = { .05, .05 },
[byte("V")] = { .05, .05 },
[byte("W")] = { .05, .05 },
[byte("X")] = { .05, .05 },
[byte("Y")] = { .05, .05 },
[byte("k")] = { 0, .05 },
[byte("r")] = { 0, .05 },
[byte("t")] = { 0, .05 },
[byte("v")] = { .05, .05 },
[byte("w")] = { .05, .05 },
[byte("x")] = { .05, .05 },
[byte("y")] = { .05, .05 },
}
fonts.protrusions.vectors['quality'] = table.merge( {},
fonts.protrusions.vectors['punctuation'],
fonts.protrusions.vectors['alpha']
)
function fonts.initializers.common.protrusion(tfmdata,value)
if value then
local class = fonts.protrusions.classes[value]
if class then
local vector = fonts.protrusions.vectors[class.vector]
if vector then
local factor = class.factor or 1
local data = characters.data
local emwidth = tfmdata.parameters.quad
for i, chr in pairs(tfmdata.characters) do
local v, pl, pr = vector[i], nil, nil
if v then
pl, pr = v[1], v[2]
else
local d = data[i]
if d then
local s = d.shcode
if not s then
-- sorry
elseif type(s) == "table" then
local vl, vr = vector[s[1]], vector[s[#s]]
if vl then pl = vl[1] end
if vr then pr = vr[2] end
else
v = vector[s]
if v then
pl, pr = v[1], v[2]
end
end
end
end
if pl and pl ~= 0 then chr.left_protruding = pl*factor end
if pr and pr ~= 0 then chr.right_protruding = pr*factor end
end
end
end
end
end
table.insert(fonts.manipulators,"protrusion")
fonts.initializers.base.otf.protrusion = fonts.initializers.common.protrusion
fonts.initializers.node.otf.protrusion = fonts.initializers.common.protrusion
fonts.initializers.base.afm.protrusion = fonts.initializers.common.protrusion
fonts.initializers.node.afm.protrusion = fonts.initializers.common.protrusion
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