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if not modules then modules = { } end modules ['font-fbk'] = {
version = 1.001,
comment = "companion to font-ini.tex",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
--[[ldx--
<p>This is very experimental code!</p>
--ldx]]--
fonts = fonts or { }
fonts.fallbacks = fonts.fallbacks or { }
fonts.vf.aux.combine.trace = false
fonts.vf.aux.combine.commands["enable-tracing"] = function(g,v)
fonts.vf.aux.combine.trace = true
end
fonts.vf.aux.combine.commands["disable-tracing"] = function(g,v)
fonts.vf.aux.combine.trace = false
end
fonts.vf.aux.combine.commands["set-tracing"] = function(g,v)
if v[2] == nil then
fonts.vf.aux.combine.trace = true
else
fonts.vf.aux.combine.trace = v[2]
end
end
function fonts.vf.aux.combine.initialize_trace()
if fonts.vf.aux.combine.trace then
return "special", "pdf: .8 0 0 rg .8 0 0 RG", "pdf: 0 .8 0 rg 0 .8 0 RG", "pdf: 0 0 .8 rg 0 0 .8 RG", "pdf: 0 g 0 G"
else
return "comment", "", "", "", ""
end
end
fonts.vf.aux.combine.force_fallback = false
fonts.vf.aux.combine.commands["fake-character"] = function(g,v) -- g, nr, fallback_id
local index, fallback = v[2], v[3]
if fonts.vf.aux.combine.force_fallback or not g.characters[index] then
if fonts.fallbacks[fallback] then
g.characters[index] = fonts.fallbacks[fallback](g)
end
end
end
fonts.fallbacks['textcent'] = function (g)
local c = string.byte("c")
local t = table.fastcopy(g.characters[c])
local s = fonts.tfm.scaled(g.specification.size or g.size)
local a = - math.tan(math.rad(g.italicangle or 0))
local special, red, green, blue, black = fonts.vf.aux.combine.initialize_trace()
if a == 0 then
t.commands = {
{"push"}, {"slot", 1, c}, {"pop"},
{"right", .5*t.width},
{"down", .2*t.height},
{special, green},
{"rule", 1.4*t.height, .02*s},
{special, black},
}
else
t.commands = {
{"push"},
{"right", .5*t.width-.025*s},
{"down", .2*t.height},
{"special",string.format("pdf: q 1 0 %s 1 0 0 cm",a)},
{special, green},
{"rule", 1.4*t.height, .025*s},
{special, black},
{"special","pdf: Q"},
{"pop"},
{"slot", 1, c} -- last else problems with cm
}
end
-- somehow the width is messed up now
-- todo: set height
t.height = 1.2*t.height
t.depth = 0.2*t.height
return t
end
fonts.fallbacks['texteuro'] = function (g)
local c = string.byte("C")
local t = table.fastcopy(g.characters[c])
local s = fonts.tfm.scaled(g.specification.size or g.size)
local d = math.cos(math.rad(90+(g.italicangle)))
local special, red, green, blue, black = fonts.vf.aux.combine.initialize_trace()
t.width = 1.05*t.width
t.commands = {
{"right", .05*t.width},
{"push"}, {"slot", 1, c}, {"pop"},
{"right", .5*t.width*d},
{"down", -.5*t.height},
{special, green},
{"rule", .05*s, .4*s},
{special, black},
}
return t
end
-- maybe store llx etc instead of bbox in tfm blob / more efficient
fonts.vf.aux.combine.force_composed = false
function fonts.vf.aux.compose_characters(g) -- todo: scaling depends on call location
-- this assumes that slot 1 is self, there will be a proper self some day
local chars = g.characters
local fastcopy = table.fastcopy
local xchar = chars[string.byte("X")]
if xchar and xchar.description then
local cap_lly = xchar.description.boundingbox[4]
local ita_cor = math.cos(math.rad(90+(g.italicangle or 0)))
local force = fonts.vf.aux.combine.force_composed
local fallbacks = characters.context.fallbacks
local special, red, green, blue, black = fonts.vf.aux.combine.initialize_trace()
for i,c in pairs(characters.data) do
if force or not chars[i] then
local s = c.specials
if s and s[1] == 'char' then
local chr = s[2]
local charschr = chars[chr]
if charschr then
local cc = c.category
if cc == 'll' or cc == 'lu' or cc == 'lt' then
local acc = s[3]
local t = fastcopy(charschr)
local d = t.description
d.name = c.adobename or "unknown"
d.unicode = i
local charsacc = chars[acc]
if not charsacc then
acc = fallbacks[acc]
charsacc = acc and chars[acc]
end
if charsacc then
local cb = charschr.description.boundingbox
local ab = charsacc.description.boundingbox
if cb and ab then
local c_llx, c_lly, c_urx, c_ury = cb[1], cb[2], cb[3], cb[4]
local a_llx, a_lly, a_urx, a_ury = ab[1], ab[2], ab[3], ab[4]
local dx = (c_urx - a_urx - a_llx + c_llx)/2
local dd = (c_urx-c_llx)*ita_cor
if a_ury < 0 then
local dy = cap_lly-a_lly
t.commands = {
{"push"},
{"right", dx-dd},
{"down", -dy}, -- added
{special, red},
{"slot", 1, acc},
{special, black},
{"pop"},
{"slot", 1, chr},
}
elseif c_ury > a_lly then
local dy = cap_lly-a_lly
t.commands = {
{"push"},
{"right", dx+dd},
{"down", -dy},
{special, green},
{"slot", 1, acc},
{special, black},
{"pop"},
{"slot", 1, chr},
}
else
t.commands = {
{"push"},
{"right", dx+dd},
{special, blue},
{"slot", 1, acc},
{special, black},
{"pop"},
{"slot", 1, chr},
}
end
end
end
chars[i] = t
end
end
end
end
end
end
end
fonts.vf.aux.combine.commands["complete-composed-characters"] = function(g,v)
fonts.vf.aux.compose_characters(g)
end
--~ {'special', 'pdf: q ' .. s .. ' 0 0 '.. s .. ' 0 0 cm'},
--~ {'special', 'pdf: q 1 0 0 1 ' .. -w .. ' ' .. -h .. ' cm'},
--~ -- {'special', 'pdf: /Fm\XX\space Do'},
--~ {'special', 'pdf: Q'},
--~ {'special', 'pdf: Q'},
-- for documentation purposes we provide:
fonts.define.methods.install("fallback", { -- todo: auto-fallback with loop over data.characters
{ "fake-character", 0x00A2, 'textcent' },
{ "fake-character", 0x20AC, 'texteuro' }
})
fonts.vf.aux.combine.commands["enable-force"] = function(g,v)
fonts.vf.aux.combine.force_composed = true
fonts.vf.aux.combine.force_fallback = true
end
fonts.vf.aux.combine.commands["disable-force"] = function(g,v)
fonts.vf.aux.combine.force_composed = false
fonts.vf.aux.combine.force_fallback = false
end
fonts.define.methods.install("demo-2", {
{ "enable-tracing" },
{ "enable-force" },
{ "initialize" },
{ "include-method", "fallback" },
{ "complete-composed-characters" },
{ "disable-tracing" },
{ "disable-force" },
})
fonts.define.methods.install("demo-3", {
{ "enable-tracing" },
{ "initialize" },
{ "complete-composed-characters" },
{ "disable-tracing" },
})
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