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Diffstat (limited to 'tex/generic/context/luatex/luatex-fonts-tfm.lua')
| -rw-r--r-- | tex/generic/context/luatex/luatex-fonts-tfm.lua | 654 |
1 files changed, 654 insertions, 0 deletions
diff --git a/tex/generic/context/luatex/luatex-fonts-tfm.lua b/tex/generic/context/luatex/luatex-fonts-tfm.lua new file mode 100644 index 000000000..0b6e09a8f --- /dev/null +++ b/tex/generic/context/luatex/luatex-fonts-tfm.lua @@ -0,0 +1,654 @@ +if not modules then modules = { } end modules ['luatex-fonts-tfm'] = { + version = 1.001, + comment = "companion to font-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- This is the generic tfm/vf loader. There are no fundamental differences with +-- the one used in ConTeXt but we save some byte(codes) this way. + +local next, type = next, type +local match, format = string.match, string.format +local concat, sortedhash = table.concat, table.sortedhash +local idiv = number.idiv + +local trace_defining = false trackers.register("fonts.defining", function(v) trace_defining = v end) +local trace_features = false trackers.register("tfm.features", function(v) trace_features = v end) + +local report_defining = logs.reporter("fonts","defining") +local report_tfm = logs.reporter("fonts","tfm loading") + +local findbinfile = resolvers.findbinfile +local setmetatableindex = table.setmetatableindex + +local fonts = fonts +local handlers = fonts.handlers +local helpers = fonts.helpers +local readers = fonts.readers +local constructors = fonts.constructors +local encodings = fonts.encodings + +local tfm = constructors.handlers.tfm +tfm.version = 1.000 +tfm.maxnestingdepth = 5 +tfm.maxnestingsize = 65536*1024 + +local otf = fonts.handlers.otf +local otfenhancers = otf.enhancers + +local tfmfeatures = constructors.features.tfm +local registertfmfeature = tfmfeatures.register + +local tfmenhancers = constructors.enhancers.tfm +local registertfmenhancer = tfmenhancers.register + +local charcommand = helpers.commands.char + +constructors.resolvevirtualtoo = false -- wil be set in font-ctx.lua + +fonts.formats.tfm = "type1" -- we need to have at least a value here +fonts.formats.ofm = "type1" -- we need to have at least a value here + +function tfm.setfeatures(tfmdata,features) + local okay = constructors.initializefeatures("tfm",tfmdata,features,trace_features,report_tfm) + if okay then + return constructors.collectprocessors("tfm",tfmdata,features,trace_features,report_tfm) + else + return { } -- will become false + end +end + +local depth = { } -- table.setmetatableindex("number") + +local loadtfm = font.read_tfm +local loadvf = font.read_vf + +local function read_from_tfm(specification) + local filename = specification.filename + local size = specification.size + depth[filename] = (depth[filename] or 0) + 1 + if trace_defining then + report_defining("loading tfm file %a at size %s",filename,size) + end + local tfmdata = loadtfm(filename,size) + if tfmdata then + + local features = specification.features and specification.features.normal or { } + local features = constructors.checkedfeatures("tfm",features) + specification.features.normal = features + + -- If reencode returns a new table, we assume that we're doing something + -- special. An 'auto' reencode picks up its vector from the pfb file. + + local newtfmdata = (depth[filename] == 1) and tfm.reencode(tfmdata,specification) + if newtfmdata then + tfmdata = newtfmdata + end + + local resources = tfmdata.resources or { } + local properties = tfmdata.properties or { } + local parameters = tfmdata.parameters or { } + local shared = tfmdata.shared or { } + -- + shared.features = features + shared.resources = resources + -- + properties.name = tfmdata.name -- todo: fallback + properties.fontname = tfmdata.fontname -- todo: fallback + properties.psname = tfmdata.psname -- todo: fallback + properties.fullname = tfmdata.fullname -- todo: fallback + properties.filename = specification.filename -- todo: fallback + properties.format = tfmdata.format or fonts.formats.tfm -- better than nothing + properties.usedbitmap = tfmdata.usedbitmap + -- + tfmdata.properties = properties + tfmdata.resources = resources + tfmdata.parameters = parameters + tfmdata.shared = shared + -- + shared.rawdata = { resources = resources } + shared.features = features + -- + -- The next branch is only entered when we have a proper encoded file i.e. + -- unicodes and such. It really nakes no sense to do feature juggling when + -- we have no names and unicodes. + -- + if newtfmdata then + -- + -- Some opentype processing assumes these to be present: + -- + if not resources.marks then + resources.marks = { } + end + if not resources.sequences then + resources.sequences = { } + end + if not resources.features then + resources.features = { + gsub = { }, + gpos = { }, + } + end + if not tfmdata.changed then + tfmdata.changed = { } + end + if not tfmdata.descriptions then + tfmdata.descriptions = tfmdata.characters + end + -- + -- It might be handy to have this: + -- + otf.readers.addunicodetable(tfmdata) + -- + -- We make a pseudo opentype font, e.g. kerns and ligatures etc: + -- + tfmenhancers.apply(tfmdata,filename) + -- + -- Now user stuff can kick in. + -- + constructors.applymanipulators("tfm",tfmdata,features,trace_features,report_tfm) + -- + -- As that can also mess with names and such, we are now ready for finalizing + -- the unicode information. This is a different order that for instance type one + -- (afm) files. First we try to deduce unicodes from already present information. + -- + otf.readers.unifymissing(tfmdata) + -- + -- Next we fill in the gaps, based on names from teh agl. Probably not much will + -- happen here. + -- + fonts.mappings.addtounicode(tfmdata,filename) + -- + -- The tounicode data is passed to the backend that constructs the vectors for us. + -- + tfmdata.tounicode = 1 + local tounicode = fonts.mappings.tounicode + for unicode, v in next, tfmdata.characters do + local u = v.unicode + if u then + v.tounicode = tounicode(u) + end + end + -- + -- However, when we use a bitmap font those vectors can't be constructed because + -- that information is not carried with those fonts (there is no name info, nor + -- proper index info, nor unicodes at that end). So, we provide it ourselves. + -- + if tfmdata.usedbitmap then + tfm.addtounicode(tfmdata) + end + end + -- + shared.processes = next(features) and tfm.setfeatures(tfmdata,features) or nil + -- + if size < 0 then + size = idiv(65536 * -size,100) + end + parameters.factor = 1 -- already scaled + parameters.units = 1000 -- just in case + parameters.size = size + parameters.slant = parameters.slant or parameters[1] or 0 + parameters.space = parameters.space or parameters[2] or 0 + parameters.space_stretch = parameters.space_stretch or parameters[3] or 0 + parameters.space_shrink = parameters.space_shrink or parameters[4] or 0 + parameters.x_height = parameters.x_height or parameters[5] or 0 + parameters.quad = parameters.quad or parameters[6] or 0 + parameters.extra_space = parameters.extra_space or parameters[7] or 0 + -- + constructors.enhanceparameters(parameters) -- official copies for us + -- + properties.private = properties.private or tfmdata.private or privateoffset + -- + if newtfmdata then + -- + -- We do nothing as we assume flat tfm files. It would become real messy + -- otherwise and I don't have something for testing on my system anyway. + -- + elseif constructors.resolvevirtualtoo then + fonts.loggers.register(tfmdata,file.suffix(filename),specification) -- strange, why here + local vfname = findbinfile(specification.name, 'ovf') + if vfname and vfname ~= "" then + local vfdata = loadvf(vfname,size) + if vfdata then + local chars = tfmdata.characters + for k,v in next, vfdata.characters do + chars[k].commands = v.commands + end + properties.virtualized = true + tfmdata.fonts = vfdata.fonts + tfmdata.type = "virtual" -- else nested calls with cummulative scaling + local fontlist = vfdata.fonts + local name = file.nameonly(filename) + for i=1,#fontlist do + local n = fontlist[i].name + local s = fontlist[i].size + local d = depth[filename] + s = constructors.scaled(s,vfdata.designsize) + if d > tfm.maxnestingdepth then + report_defining("too deeply nested virtual font %a with size %a, max nesting depth %s",n,s,tfm.maxnestingdepth) + fontlist[i] = { id = 0 } + elseif (d > 1) and (s > tfm.maxnestingsize) then + report_defining("virtual font %a exceeds size %s",n,s) + fontlist[i] = { id = 0 } + else + local t, id = constructors.readanddefine(n,s) + fontlist[i] = { id = id } + end + end + end + end + end + -- + properties.haskerns = true + properties.hasligatures = true + properties.hasitalics = true + resources.unicodes = { } + resources.lookuptags = { } + -- + depth[filename] = depth[filename] - 1 + -- + return tfmdata + else + depth[filename] = depth[filename] - 1 + end +end + +local function check_tfm(specification,fullname) -- we could split up like afm/otf + local foundname = findbinfile(fullname, 'tfm') or "" + if foundname == "" then + foundname = findbinfile(fullname, 'ofm') or "" -- not needed in context + end + if foundname == "" then + foundname = fonts.names.getfilename(fullname,"tfm") or "" + end + if foundname ~= "" then + specification.filename = foundname + specification.format = "ofm" + return read_from_tfm(specification) + elseif trace_defining then + report_defining("loading tfm with name %a fails",specification.name) + end +end + +readers.check_tfm = check_tfm + +function readers.tfm(specification) + local fullname = specification.filename or "" + if fullname == "" then + local forced = specification.forced or "" + if forced ~= "" then + fullname = specification.name .. "." .. forced + else + fullname = specification.name + end + end + return check_tfm(specification,fullname) +end + +readers.ofm = readers.tfm + +-- The reencoding acts upon the 'reencode' feature which can have values 'auto' or +-- an enc file. You can also specify a 'pfbfile' feature (but it defaults to the +-- tfm filename) and a 'bitmap' feature. When no enc file is givven (auto) we will +-- get the vectors from the pfb file. + +do + + local outfiles = { } + + local tfmcache = table.setmetatableindex(function(t,tfmdata) + local id = font.define(tfmdata) + t[tfmdata] = id + return id + end) + + local encdone = table.setmetatableindex("table") + + function tfm.reencode(tfmdata,specification) + + local features = specification.features + + if not features then + return + end + + local features = features.normal + + if not features then + return + end + + local tfmfile = file.basename(tfmdata.name) + local encfile = features.reencode -- or features.enc + local pfbfile = features.pfbfile -- or features.pfb + local bitmap = features.bitmap -- or features.pk + + if not encfile then + return + end + + local pfbfile = outfiles[tfmfile] + + if pfbfile == nil then + if bitmap then + pfbfile = false + elseif type(pfbfile) ~= "string" then + pfbfile = tfmfile + end + if type(pfbfile) == "string" then + pfbfile = file.addsuffix(pfbfile,"pfb") + -- pdf.mapline(tfmfile .. "<" .. pfbfile) + report_tfm("using type1 shapes from %a for %a",pfbfile,tfmfile) + else + report_tfm("using bitmap shapes for %a",tfmfile) + pfbfile = false -- use bitmap + end + outfiles[tfmfile] = pfbfile + end + + local encoding = false + local vector = false + + if type(pfbfile) == "string" then + local pfb = constructors.handlers.pfb + if pfb and pfb.loadvector then + local v, e = pfb.loadvector(pfbfile) + if v then + vector = v + end + if e then + encoding = e + end + end + end + if type(encfile) == "string" and encfile ~= "auto" then + encoding = fonts.encodings.load(file.addsuffix(encfile,"enc")) + if encoding then + encoding = encoding.vector + end + end + if not encoding then + report_tfm("bad encoding for %a, quitting",tfmfile) + return + end + + local unicoding = fonts.encodings.agl and fonts.encodings.agl.unicodes + local virtualid = tfmcache[tfmdata] + local tfmdata = table.copy(tfmdata) -- good enough for small fonts + local characters = { } + local originals = tfmdata.characters + local indices = { } + local parentfont = { "font", 1 } + local private = tfmdata.privateoffset or constructors.privateoffset + local reported = encdone[tfmfile][encfile] + + -- create characters table + + local backmap = vector and table.swapped(vector) + local done = { } -- prevent duplicate + + for index, name in sortedhash(encoding) do -- predictable order + local unicode = unicoding[name] + local original = originals[index] + if original then + if unicode then + original.unicode = unicode + else + unicode = private + private = private + 1 + if not reported then + report_tfm("glyph %a in font %a with encoding %a gets unicode %U",name,tfmfile,encfile,unicode) + end + end + characters[unicode] = original + indices[index] = unicode + original.name = name -- so one can lookup weird names + if backmap then + original.index = backmap[name] + else -- probably bitmap + original.commands = { parentfont, charcommand[index] } -- or "slot" + original.oindex = index + end + done[name] = true + elseif not done[name] then + report_tfm("bad index %a in font %a with name %a",index,tfmfile,name) + end + end + + encdone[tfmfile][encfile] = true + + -- redo kerns and ligatures + + for k, v in next, characters do + local kerns = v.kerns + if kerns then + local t = { } + for k, v in next, kerns do + local i = indices[k] + if i then + t[i] = v + end + end + v.kerns = next(t) and t or nil + end + local ligatures = v.ligatures + if ligatures then + local t = { } + for k, v in next, ligatures do + local i = indices[k] + if i then + t[i] = v + v.char = indices[v.char] + end + end + v.ligatures = next(t) and t or nil + end + end + + -- wrap up + + tfmdata.fonts = { { id = virtualid } } + tfmdata.characters = characters + tfmdata.fullname = tfmdata.fullname or tfmdata.name + tfmdata.psname = file.nameonly(pfbfile or tfmdata.name) + tfmdata.filename = pfbfile + tfmdata.encodingbytes = 2 + -- tfmdata.format = bitmap and "type3" or "type1" + tfmdata.format = "type1" + tfmdata.tounicode = 1 + tfmdata.embedding = "subset" + tfmdata.usedbitmap = bitmap and virtualid + tfmdata.private = private + + return tfmdata + end + +end + +-- This code adds a ToUnicode vector for bitmap fonts. We don't bother about +-- ranges because we have small fonts. it works ok with acrobat but fails with +-- the other viewers (they get confused by the bitmaps I guess). + +do + + local template = [[ +/CIDInit /ProcSet findresource begin + 12 dict begin + begincmap + /CIDSystemInfo << /Registry (TeX) /Ordering (bitmap-%s) /Supplement 0 >> def + /CMapName /TeX-bitmap-%s def + /CMapType 2 def + 1 begincodespacerange + <00> <FF> + endcodespacerange + %s beginbfchar +%s + endbfchar + endcmap +CMapName currentdict /CMap defineresource pop end +end +end +]] + + local flushstreamobject = lpdf and lpdf.flushstreamobject -- context + local setfontattributes = lpdf and lpdf.setfontattributes -- context + + if not flushstreamobject then + flushstreamobject = function(data) + return pdf.obj { immediate = true, type = "stream", string = data } -- generic + end + end + + if not setfontattributes then + setfontattributes = function(id,data) + return pdf.setfontattributes(id,data) -- generic + end + end + + function tfm.addtounicode(tfmdata) + local id = tfmdata.usedbitmap + local map = { } + local char = { } -- no need for range, hardly used + for k, v in next, tfmdata.characters do + local index = v.oindex + local tounicode = v.tounicode + if index and tounicode then + map[index] = tounicode + end + end + for k, v in sortedhash(map) do + char[#char+1] = format("<%02X> <%s>",k,v) + end + char = concat(char,"\n") + local stream = format(template,id,id,#char,char) + local reference = flushstreamobject(stream,nil,true) + setfontattributes(id,format("/ToUnicode %i 0 R",reference)) + end + +end + +-- Now we implement the regular features handlers. We need to convert the +-- tfm specific structures to opentype structures. In basemode they are +-- converted back so that is a bit of a waste but it's fast enough. + +do + + local everywhere = { ["*"] = { ["*"] = true } } -- or: { ["*"] = { "*" } } + local noflags = { false, false, false, false } + + local function enhance_normalize_features(data) + local ligatures = setmetatableindex("table") + local kerns = setmetatableindex("table") + local characters = data.characters + for u, c in next, characters do + local l = c.ligatures + local k = c.kerns + if l then + ligatures[u] = l + for u, v in next, l do + l[u] = { ligature = v.char } + end + c.ligatures = nil + end + if k then + kerns[u] = k + for u, v in next, k do + k[u] = v -- { v, 0 } + end + c.kerns = nil + end + end + + for u, l in next, ligatures do + for k, v in next, l do + local vl = v.ligature + local dl = ligatures[vl] + if dl then + for kk, vv in next, dl do + v[kk] = vv -- table.copy(vv) + end + end + end + end + + local features = { + gpos = { }, + gsub = { }, + } + local sequences = { + -- only filled ones + } + if next(ligatures) then + features.gsub.liga = everywhere + data.properties.hasligatures = true + sequences[#sequences+1] = { + features = { + liga = everywhere, + }, + flags = noflags, + name = "s_s_0", + nofsteps = 1, + order = { "liga" }, + type = "gsub_ligature", + steps = { + { + coverage = ligatures, + }, + }, + } + end + if next(kerns) then + features.gpos.kern = everywhere + data.properties.haskerns = true + sequences[#sequences+1] = { + features = { + kern = everywhere, + }, + flags = noflags, + name = "p_s_0", + nofsteps = 1, + order = { "kern" }, + type = "gpos_pair", + steps = { + { + format = "kern", + coverage = kerns, + }, + }, + } + end + data.resources.features = features + data.resources.sequences = sequences + data.shared.resources = data.shared.resources or resources + end + + registertfmenhancer("normalize features", enhance_normalize_features) + registertfmenhancer("check extra features", otfenhancers.enhance) + +end + +-- As with type one (afm) loading, we just use the opentype ones: + +registertfmfeature { + name = "mode", + description = "mode", + initializers = { + base = otf.modeinitializer, + node = otf.modeinitializer, + } +} + +registertfmfeature { + name = "features", + description = "features", + default = true, + initializers = { + base = otf.basemodeinitializer, + node = otf.nodemodeinitializer, + }, + processors = { + node = otf.featuresprocessor, + } +} |