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Diffstat (limited to 'tex/context/base/font-enh.lua')
| -rw-r--r-- | tex/context/base/font-enh.lua | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/tex/context/base/font-enh.lua b/tex/context/base/font-enh.lua new file mode 100644 index 000000000..fc70c04c5 --- /dev/null +++ b/tex/context/base/font-enh.lua @@ -0,0 +1,201 @@ +if not modules then modules = { } end modules ['font-enh'] = { + 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" +} + +local next, match = next, string.match + +local trace_defining = false trackers.register("fonts.defining", function(v) trace_defining = v end) + +-- tfmdata has also fast access to indices and unicodes +-- to be checked: otf -> tfm -> tfmscaled +-- +-- watch out: no negative depths and negative eights permitted in regular fonts + +--[[ldx-- +<p>Here we only implement a few helper functions.</p> +--ldx]]-- + +local tfm = fonts.tfm + +--[[ldx-- +<p>The next function encapsulates the standard <l n='tfm'/> loader as +supplied by <l n='luatex'/>.</p> +--ldx]]-- + +-- auto complete font with missing composed characters + +table.insert(fonts.manipulators,"compose") + +function fonts.initializers.common.compose(tfmdata,value) + if value then + fonts.vf.aux.compose_characters(tfmdata) + end +end + +-- tfm features, experimental + +tfm.features = tfm.features or { } +tfm.features.list = tfm.features.list or { } +tfm.features.default = tfm.features.default or { } + +function tfm.enhance(tfmdata,specification) + -- we don't really share tfm data because we always reload + -- but this is more in sycn with afm and such + local features = (specification.features and specification.features.normal ) or { } + tfmdata.shared = tfmdata.shared or { } + tfmdata.shared.features = features + -- tfmdata.shared.tfmdata = tfmdata -- circular + tfmdata.filename = specification.name + if not features.encoding then + local name, size = specification.name, specification.size + local encoding, filename = match(name,"^(.-)%-(.*)$") -- context: encoding-name.* + if filename and encoding and fonts.enc.known[encoding] then + features.encoding = encoding + end + end + tfm.set_features(tfmdata) +end + +function tfm.set_features(tfmdata) + -- todo: no local functions + local shared = tfmdata.shared +-- local tfmdata = shared.tfmdata + local features = shared.features + if features and next(features) then + local mode = tfmdata.mode or fonts.mode + local fi = fonts.initializers[mode] + if fi and fi.tfm then + local function initialize(list) -- using tex lig and kerning + if list then + for i=1,#list do + local f = list[i] + local value = features[f] + if value and fi.tfm[f] then -- brr + if tfm.trace_features then + logs.report("define font","initializing feature %s to %s for mode %s for font %s",f,tostring(value),mode or 'unknown',tfmdata.name or 'unknown') + end + fi.tfm[f](tfmdata,value) + mode = tfmdata.mode or fonts.mode + fi = fonts.initializers[mode] + end + end + end + end + initialize(fonts.triggers) + initialize(tfm.features.list) + initialize(fonts.manipulators) + end + local fm = fonts.methods[mode] + if fm and fm.tfm then + local function register(list) -- node manipulations + if list then + for i=1,#list do + local f = list[i] + if features[f] and fm.tfm[f] then -- brr + if not shared.processors then -- maybe also predefine + shared.processors = { fm.tfm[f] } + else + shared.processors[#shared.processors+1] = fm.tfm[f] + end + end + end + end + end + register(tfm.features.list) + end + end +end + +function tfm.features.register(name,default) + tfm.features.list[#tfm.features.list+1] = name + tfm.features.default[name] = default +end + +function tfm.reencode(tfmdata,encoding) + if encoding and fonts.enc.known[encoding] then + local data = fonts.enc.load(encoding) + if data then + local characters, original, vector = tfmdata.characters, { }, data.vector + tfmdata.encoding = encoding -- not needed + for k, v in next, characters do + v.name, v.index, original[k] = vector[k], k, v + end + for k,v in next, data.unicodes do + if k ~= v then + if trace_defining then + logs.report("define font","reencoding U+%04X to U+%04X",k,v) + end + characters[k] = original[v] + end + end + end + end +end + +tfm.features.register('reencode') + +fonts.initializers.base.tfm.reencode = tfm.reencode +fonts.initializers.node.tfm.reencode = tfm.reencode + +fonts.enc = fonts.enc or { } +fonts.enc.remappings = fonts.enc.remappings or { } + +function tfm.remap(tfmdata,remapping) + local vector = remapping and fonts.enc.remappings[remapping] + if vector then + local characters, original = tfmdata.characters, { } + for k, v in next, characters do + original[k], characters[k] = v, nil + end + for k,v in next, vector do + if k ~= v then + if trace_defining then + logs.report("define font","remapping U+%04X to U+%04X",k,v) + end + local c = original[k] + characters[v] = c + c.index = k + end + end + tfmdata.encodingbytes = 2 + tfmdata.format = 'type1' + end +end + +tfm.features.register('remap') + +fonts.initializers.base.tfm.remap = tfm.remap +fonts.initializers.node.tfm.remap = tfm.remap + +--~ obsolete +--~ +--~ function tfm.enhance(tfmdata,specification) +--~ local name, size = specification.name, specification.size +--~ local encoding, filename = match(name,"^(.-)%-(.*)$") -- context: encoding-name.* +--~ if filename and encoding and fonts.enc.known[encoding] then +--~ local data = fonts.enc.load(encoding) +--~ if data then +--~ local characters = tfmdata.characters +--~ tfmdata.encoding = encoding +--~ local vector = data.vector +--~ local original = { } +--~ for k, v in next, characters do +--~ v.name = vector[k] +--~ v.index = k +--~ original[k] = v +--~ end +--~ for k,v in next, data.unicodes do +--~ if k ~= v then +--~ if trace_defining then +--~ logs.report("define font","mapping %s onto %s",k,v) +--~ end +--~ characters[k] = original[v] +--~ end +--~ end +--~ end +--~ end +--~ end |