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diff --git a/Master/texmf-dist/tex/context/base/font-fbk.lua b/Master/texmf-dist/tex/context/base/font-fbk.lua
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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" },
+})