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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
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