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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"
}
local cos, tan, rad, format = math.cos, math.tan, math.rad, string.format
local trace_combining = false trackers.register("fonts.combining", function(v) trace_combining = v end)
--[[ldx--
<p>This is very experimental code!</p>
--ldx]]--
fonts.fallbacks = fonts.fallbacks or { }
local vf = fonts.vf
local tfm = fonts.tfm
vf.aux.combine.commands["enable-tracing"] = function(g,v)
trace_combining = true
end
vf.aux.combine.commands["disable-tracing"] = function(g,v)
trace_combining = false
end
vf.aux.combine.commands["set-tracing"] = function(g,v)
if v[2] == nil then
trace_combining = true
else
trace_combining = v[2]
end
end
function vf.aux.combine.initialize_trace()
if trace_combining 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
vf.aux.combine.force_fallback = false
vf.aux.combine.commands["fake-character"] = function(g,v) -- g, nr, fallback_id
local index, fallback = v[2], v[3]
if vf.aux.combine.force_fallback or not g.characters[index] then
if fonts.fallbacks[fallback] then
g.characters[index], g.descriptions[index] = fonts.fallbacks[fallback](g)
end
end
end
fonts.fallbacks['textcent'] = function (g)
local c = ("c"):byte()
local t = table.fastcopy(g.characters[c])
local a = - tan(rad(g.italicangle or 0))
local special, red, green, blue, black = vf.aux.combine.initialize_trace()
local quad = g.parameters.quad
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*quad},
{special, black},
}
else
t.commands = {
{"push"},
{"right", .5*t.width-.025*quad},
{"down", .2*t.height},
{"special",format("pdf: q 1 0 %s 1 0 0 cm",a)},
{special, green},
{"rule", 1.4*t.height, .025*quad},
{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
g.virtualized = true
local d = g.descriptions
return t, d and d[c]
end
fonts.fallbacks['texteuro'] = function (g)
local c = ("C"):byte()
local t = table.fastcopy(g.characters[c])
local d = cos(rad(90+(g.italicangle)))
local special, red, green, blue, black = vf.aux.combine.initialize_trace()
local quad = g.parameters.quad
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*quad, .4*quad},
{special, black},
}
g.virtualized = true
return t, g.descriptions[c]
end
-- maybe store llx etc instead of bbox in tfm blob / more efficient
vf.aux.combine.force_composed = false
local push, pop = { "push" }, { "pop" }
local cache = { } -- we could make these weak
function 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, descs = g.characters, g.descriptions
local X = ("X"):byte()
local xchar = chars[X]
local xdesc = descs[X]
if xchar and xdesc then
local scale = g.factor or 1
local cap_lly = scale*xdesc.boundingbox[4]
local ita_cor = cos(rad(90+(g.italicangle or 0)))
local force = vf.aux.combine.force_composed
local fallbacks = characters.fallbacks
local special, red, green, blue, black
if trace_combining then
special, red, green, blue, black = vf.aux.combine.initialize_trace()
red, green, blue, black = { special, red }, { special, green }, { special, blue }, { special, black }
end
local done = false
for i,c in next, 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 = { }
for k, v in next, charschr do
if k ~= "commands" then
t[k] = v
end
end
local charsacc = chars[acc]
--~ local ca = charsacc.category
--~ if ca == "mn" then
--~ -- mark nonspacing
--~ elseif ca == "ms" then
--~ -- mark spacing combining
--~ elseif ca == "me" then
--~ -- mark enclosing
--~ else
if not charsacc then
acc = fallbacks[acc]
charsacc = acc and chars[acc]
end
if charsacc then
local chr_t = cache[chr]
if not cht_t then
chr_t = {"slot", 1, chr}
cache[chr] = chr_t
end
local acc_t = cache[acc]
if not acc_t then
acc_t = {"slot", 1, acc}
cache[acc] = acc_t
end
local cb = descs[chr].boundingbox
local ab = descs[acc].boundingbox
if cb and ab then
-- can be sped up for scale == 1
local c_llx, c_lly, c_urx, c_ury = scale*cb[1], scale*cb[2], scale*cb[3], scale*cb[4]
local a_llx, a_lly, a_urx, a_ury = scale*ab[1], scale*ab[2], scale*ab[3], scale*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
if trace_combining then
t.commands = {
push,
{"right", dx-dd},
red,
acc_t,
black,
pop,
chr_t,
}
else
t.commands = {
push,
{"right", dx-dd},
acc_t,
pop,
chr_t,
}
end
elseif c_ury > a_lly then
local dy = cap_lly-a_lly
if trace_combining then
t.commands = {
push,
{"right", dx+dd},
{"down", -dy},
green,
acc_t,
black,
pop,
chr_t,
}
else
t.commands = {
push,
{"right", dx+dd},
{"down", -dy},
acc_t,
pop,
chr_t,
}
end
else
if trace_combining then
t.commands = {
{"push"},
{"right", dx+dd},
blue,
acc_t,
black,
{"pop"},
chr_t,
}
else
t.commands = {
{"push"},
{"right", dx+dd},
acc_t,
{"pop"},
chr_t,
}
end
end
done = true
end
end
chars[i] = t
local d = { }
for k, v in next, descs[chr] do
d[k] = v
end
d.name = c.adobename or "unknown"
-- d.unicode = i
descs[i] = d
end
end
end
end
end
if done then
g.virtualized = true
end
end
end
vf.aux.combine.commands["complete-composed-characters"] = function(g,v)
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' }
})
vf.aux.combine.commands["enable-force"] = function(g,v)
vf.aux.combine.force_composed = true
vf.aux.combine.force_fallback = true
end
vf.aux.combine.commands["disable-force"] = function(g,v)
vf.aux.combine.force_composed = false
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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