diff options
Diffstat (limited to 'Master/texmf-dist/tex/context/base/font-fbk.lua')
-rw-r--r-- | Master/texmf-dist/tex/context/base/font-fbk.lua | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/context/base/font-fbk.lua b/Master/texmf-dist/tex/context/base/font-fbk.lua new file mode 100644 index 00000000000..0d1ae6218eb --- /dev/null +++ b/Master/texmf-dist/tex/context/base/font-fbk.lua @@ -0,0 +1,236 @@ +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" }, +}) |