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|
if not modules then modules = { } end modules ['font-tfm'] = {
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>Here we only implement a few helper functions.</p>
--ldx]]--
fonts = fonts or { }
fonts.loaded = fonts.loaded or { }
fonts.dontembed = fonts.dontembed or { }
fonts.logger = fonts.logger or { }
fonts.loadtime = 0
fonts.tfm = fonts.tfm or { }
fonts.triggers = fonts.triggers or { } -- brrr
--[[ldx--
<p>The next function encapsulates the standard <l n='tfm'/> loader as
supplied by <l n='luatex'/>.</p>
--ldx]]--
fonts.tfm.resolve_vf = true -- false
function fonts.tfm.enhance(tfmdata,specification)
local name, size = specification.name, specification.size
local encoding, filename = name:match("^(.-)%-(.*)$") -- 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
for k, v in pairs(characters) do
v.name = vector[k]
v.index = k
end
for k,v in pairs(data.unicodes) do
if k ~= v then
-- if not characters[k] then
if fonts.trace then
logs.report("define font",string.format("mapping %s onto %s",k,v))
end
characters[k] = characters[v]
-- end
end
end
end
end
end
function fonts.tfm.read_from_tfm(specification)
local fname, tfmdata = specification.filename, nil
if fname then
-- safeguard, we use tfm as fallback
local suffix = file.extname(fname)
if suffix ~= "" and suffix ~= "tfm" then
fname = ""
end
end
if not fname or fname == "" then
fname = input.findbinfile(texmf.instance, specification.name, 'ofm')
else
fname = input.findbinfile(texmf.instance, fname, 'ofm')
end
if fname and fname ~= "" then
if fonts.trace then
logs.report("define font",string.format("loading tfm file %s at size %s",fname,specification.size))
end
tfmdata = font.read_tfm(fname,specification.size) -- not cached, fast enough
if tfmdata then
if fonts.tfm.resolve_vf then
fonts.logger.save(tfmdata,file.extname(fname),specification) -- strange, why here
fname = input.findbinfile(texmf.instance, specification.name, 'ovf')
if fname and fname ~= "" then
local vfdata = font.read_vf(fname,specification.size) -- not cached, fast enough
if vfdata then
local chars = tfmdata.characters
for k,v in pairs(vfdata.characters) do -- no ipairs, can have holes
chars[k].commands = v.commands
end
tfmdata.type = 'virtual'
tfmdata.fonts = vfdata.fonts
end
end
--~ print(table.serialize(tfmdata))
end
fonts.tfm.enhance(tfmdata,specification)
end
else
if fonts.trace then
logs.report("define font",string.format("loading tfm with name %s fails",specification.name))
end
end
return tfmdata
end
--[[ldx--
<p>We need to normalize the scale factor (in scaled points). This has to
do with the fact that <l n='tex'/> uses a negative multiple of 1000 as
a signal for a font scaled based on the design size.</p>
--ldx]]--
do
local factors = {
pt = 65536.0,
bp = 65781.8,
}
function fonts.tfm.setfactor(f)
fonts.tfm.factor = factors[f or 'pt'] or factors.pt
end
fonts.tfm.setfactor()
end
function fonts.tfm.scaled(scaledpoints, designsize) -- handles designsize in sp as well
if scaledpoints < 0 then
if designsize then
if designsize > fonts.tfm.factor then -- or just 1000 / when? mp?
return (- scaledpoints/1000) * designsize -- sp's
else
return (- scaledpoints/1000) * designsize * fonts.tfm.factor
end
else
return (- scaledpoints/1000) * 10 * fonts.tfm.factor
end
else
return scaledpoints
end
end
--~ function fonts.tfm.scaled(scaledpoints, designsize)
--~ if scaledpoints < 0 then
--~ return (- scaledpoints/1000) * (designsize or 10) * fonts.tfm.factor
--~ else
--~ return scaledpoints
--~ end
--~ end
--[[ldx--
<p>Before a font is passed to <l n='tex'/> we scale it. Here we also need
to scale virtual characters.</p>
--ldx]]--
function fonts.tfm.get_virtual_id(tfmdata)
-- since we don't know the id yet, we use 0 as signal
if not tfmdata.fonts then
tfmdata.type = "virtual"
tfmdata.fonts = { { id = 0 } }
return 1
else
tfmdata.fonts[#tfmdata.fonts+1] = { id = 0 }
return #tfmdata.fonts
end
end
function fonts.tfm.check_virtual_id(tfmdata, id)
if tfmdata and tfmdata.type == "virtual" then
if not tfmdata.fonts or #tfmdata.fonts == 0 then
tfmdata.type, tfmdata.fonts = "real", nil
else
for k,v in ipairs(tfmdata.fonts) do
if v.id and v.id == 0 then
v.id = id
end
end
end
end
end
--[[ldx--
<p>Beware, the boundingbox is passed as reference so we may not overwrite it
in the process; numbers are of course copies. Here 65536 equals 1pt. (Due to
excessive memory usage in CJK fonts, we no longer pass the boundingbox.)</p>
--ldx]]--
fonts.trace_scaling = false
function fonts.tfm.do_scale(tfmtable, scaledpoints)
local trace = fonts.trace_scaling
if scaledpoints < 0 then
scaledpoints = (- scaledpoints/1000) * tfmtable.designsize -- already in sp
end
local delta = scaledpoints/(tfmtable.units or 1000) -- brr, some open type fonts have 2048
local t = { }
t.factor = delta
for k,v in pairs(tfmtable) do
t[k] = (type(v) == "table" and { }) or v
end
-- new
if tfmtable.fonts then
t.fonts = table.fastcopy(tfmtable.fonts)
end
-- local zerobox = { 0, 0, 0, 0 }
local tp = t.parameters
local tfmp = tfmtable.parameters -- let's check for indexes
tp.slant = (tfmp.slant or tfmp[1] or 0)
tp.space = (tfmp.space or tfmp[2] or 0)*delta
tp.space_stretch = (tfmp.space_stretch or tfmp[3] or 0)*delta
tp.space_shrink = (tfmp.space_shrink or tfmp[4] or 0)*delta
tp.x_height = (tfmp.x_height or tfmp[5] or 0)*delta
tp.quad = (tfmp.quad or tfmp[6] or 0)*delta
tp.extra_space = (tfmp.extra_space or tfmp[7] or 0)*delta
local protrusionfactor = (tp.quad ~= 0 and 1000/tp.quad) or 0
local tc = t.characters
for k,v in pairs(tfmtable.characters) do
local description = v.description or v -- shared data
local chr = {
description = description,
unicode = description.unicode,
name = description.name,
index = description.index or k,
width = delta*(description.width or 0),
height = delta*(description.height or 0),
depth = delta*(description.depth or 0),
class = description.class
}
if trace then
logs.report("define font", string.format("n=%s, u=%s, i=%s, n=%s c=%s",k,description.unicode,description.index,description.name or '-',description.class or '-'))
end
-- local vb = v.boundingbox
-- if vb then
-- chr.boundingbox = { vb[1]*delta, vb[2]*delta, vb[3]*delta, vb[4]*delta }
-- else
-- -- chr.boundingbox = zerobox -- most afm en otf files have bboxes so ..
-- end
local ve = v.expansion_factor
if ve then
chr.expansion_factor = ve*1000 -- expansionfactor
end
local vl = v.left_protruding
if vl then
chr.left_protruding = protrusionfactor*chr.width*vl
end
local vr = v.right_protruding
if vr then
chr.right_protruding = protrusionfactor*chr.width*vr
end
local vi = description.italic
if vi then
chr.italic = vi*delta
end
local vk = v.kerns
if vk then
local tt = {}
for k,v in pairs(vk) do tt[k] = v*delta end
chr.kerns = tt
end
local vl = v.ligatures
if vl then
if true then
chr.ligatures = vl -- shared
else
local tt = { }
for i,l in pairs(vl) do
tt[i] = l
end
chr.ligatures = tt
end
end
local vc = v.commands
if vc then
-- we assume non scaled commands here
local tt = { }
for i=1,#vc do
local ivc = vc[i]
local key = ivc[1]
if key == "right" or key == "left" or key == "down" or key == "up" then
tt[#tt+1] = { key, ivc[2]*delta }
else -- not comment
tt[#tt+1] = ivc -- shared since in cache and untouched
end
end
chr.commands = tt
end
tc[k] = chr
end
-- t.encodingbytes, t.filename, t.fullname, t.name: elsewhere
t.size = scaledpoints
if t.fonts then
t.fonts = table.fastcopy(t.fonts) -- maybe we virtualize more afterwards
end
return t, delta
end
--[[ldx--
<p>The reason why the scaler is split, is that for a while we experimented
with a helper function. However, in practice the <l n='api'/> calls are too slow to
make this profitable and the <l n='lua'/> based variant was just faster. A days
wasted day but an experience richer.</p>
--ldx]]--
function fonts.tfm.scale(tfmtable, scaledpoints)
local t, factor = fonts.tfm.do_scale(tfmtable, scaledpoints)
t.factor = factor
t.ascender = factor*(tfmtable.ascender or 0)
t.descender = factor*(tfmtable.descender or 0)
t.shared = tfmtable.shared or { }
t.unique = table.fastcopy(tfmtable.unique or {})
--~ print("scaling", t.name, t.factor) -- , fonts.tfm.hash_features(tfmtable.specification))
return t
end
--[[ldx--
<p>The following functions are used for reporting about the fonts
used. The message itself is not that useful in regular runs but since
we now have several readers it may be handy to know what reader is
used for which font.</p>
--ldx]]--
function fonts.logger.save(tfmtable,source,specification) -- save file name in spec here ! ! ! ! ! !
if tfmtable and specification and specification.specification then
if fonts.trace then
logs.report("define font",string.format("registering %s as %s",specification.name,source))
end
specification.source = source
fonts.loaded[specification.specification] = specification
fonts.used[specification.name] = source
end
end
function fonts.logger.report(separator)
local s = table.sortedkeys(fonts.loaded)
if #s > 0 then
local t = { }
for _,v in ipairs(s) do
t[#t+1] = v .. ":" .. fonts.loaded[v].source
end
return table.concat(t,separator or " ")
else
return "none"
end
end
function fonts.logger.format(name)
return fonts.used[name] or "unknown"
end
--[[ldx--
<p>When we implement functions that deal with features, most of them
will depend of the font format. Here we define the few that are kind
of neutral.</p>
--ldx]]--
fonts.initializers = fonts.initializers or { }
fonts.initializers.common = fonts.initializers.common or { }
--[[ldx--
<p>This feature will remove inter-digit kerns.</p>
--ldx]]--
table.insert(fonts.triggers,"equaldigits")
function fonts.initializers.common.equaldigits(tfmdata,value)
if value then
local chr = tfmdata.characters
for i = utf.byte('0'), utf.byte('9') do
local c = chr[i]
if c then
c.kerns = nil
end
end
end
end
--[[ldx--
<p>This feature will give all glyphs an equal height and/or depth. Valid
values are <type>none</type>, <type>height</type>, <type>depth</type> and
<type>both</type>.</p>
--ldx]]--
table.insert(fonts.triggers,"lineheight")
function fonts.initializers.common.lineheight(tfmdata,value)
if value and type(value) == "string" then
if value == "none" then
for _,v in pairs(tfmdata.characters) do
v.height, v.depth = 0, 0
end
else
local ascender, descender = tfmdata.ascender, tfmdata.descender
if ascender and descender then
local ht, dp = ascender or 0, descender or 0
if value == "height" then
dp = 0
elseif value == "depth" then
ht = 0
end
if ht > 0 then
if dp > 0 then
for _,v in pairs(tfmdata.characters) do
v.height, v.depth = ht, dp
end
else
for _,v in pairs(tfmdata.characters) do
v.height = ht
end
end
elseif dp > 0 then
for _,v in pairs(tfmdata.characters) do
v.depth = dp
end
end
end
end
end
end
--[[ldx--
<p>It does not make sense any more to support messed up encoding vectors
so we stick to those that implement oldstyle and small caps. After all,
we move on. We can extend the next function on demand. This features is
only used with <l n='afm'/> files.</p>
--ldx]]--
do
local smallcaps = lpeg.P(".sc") + lpeg.P(".smallcaps") + lpeg.P(".caps") + lpeg.P("small")
local oldstyle = lpeg.P(".os") + lpeg.P(".oldstyle") + lpeg.P(".onum")
smallcaps = lpeg.Cs((1-smallcaps)^1) * smallcaps^1
oldstyle = lpeg.Cs((1-oldstyle )^1) * oldstyle ^1
function fonts.initializers.common.encoding(tfmdata,value)
if value then
local encodingfile = value .. '.enc'
local encoding = fonts.enc.load(encodingfile)
if encoding then
-- tfmdata.encoding = value
local vector = encoding.vector
local afmdata = tfmdata.shared.afmdata
local characters = tfmdata.characters
local unicodes = afmdata.luatex.unicodes
local function remap(pattern,name)
local p = pattern:match(name)
if p then
local oldchr, newchr = unicodes[p], unicodes[name]
if oldchr and newchr then
-- texio.write_nl(string.format("%s (%s) -> %s (%s)",p,oldchr or -1,name,newchr or -1))
characters[oldchr] = characters[newchr]
end
end
return p
end
for _, name in pairs(vector) do
local ok = remap(smallcaps,name) or remap(oldstyle,name)
end
if fonts.map.data[tfmdata.name] then
fonts.map.data[tfmdata.name].encoding = encodingfile
end
end
end
end
-- when needed we can provide this as features in e.g. afm files
function fonts.initializers.common.remap(tfmdata,value,pattern)
if value then
local afmdata = tfmdata.shared.afmdata
local characters = tfmdata.characters
local unicodes = afmdata.luatex.unicodes
local done = false
for i, blob in pairs(characters) do
local name = blob.description.name
if name then
local p = pattern:match(name)
if p then
local oldchr, newchr = unicodes[p], unicodes[name]
if oldchr and newchr then
characters[oldchr] = characters[newchr]
end
end
end
end
end
end
function fonts.initializers.common.oldstyle(tfmdata,value)
fonts.initializers.common.remap(tfmdata,value,oldstyle)
end
function fonts.initializers.common.smallcaps(tfmdata,value)
fonts.initializers.common.remap(tfmdata,value,smallcaps)
end
function fonts.initializers.common.fakecaps(tfmdata,value)
if value then
-- todo: scale down
local afmdata = tfmdata.shared.afmdata
local characters = tfmdata.characters
local unicodes = afmdata.luatex.unicodes
for i, blob in pairs(characters) do
local name = blob.description.name
if name then
local p = name:lower()
if p then
local oldchr, newchr = unicodes[p], unicodes[name]
if oldchr and newchr then
characters[oldchr] = characters[newchr]
end
end
end
end
end
end
end
--~ function fonts.initializers.common.install(format,feature) -- 'afm','lineheight'
--~ fonts.initializers.base[format][feature] = fonts.initializers.common[feature]
--~ fonts.initializers.node[format][feature] = fonts.initializers.common[feature]
--~ end
--[[ldx--
<p>Analyzers run per script and/or language and are needed in order to
process features right.</p>
--ldx]]--
fonts.analyzers = fonts.analyzers or { }
fonts.analyzers.aux = fonts.analyzers.aux or { }
fonts.analyzers.methods = fonts.analyzers.methods or { }
fonts.analyzers.initializers = fonts.analyzers.initializers or { }
do
local glyph = node.id('glyph')
local fontdata = fonts.tfm.id
local set_attribute = node.set_attribute
-- local unset_attribute = node.unset_attribute
-- local has_attribute = node.has_attribute
local state = attributes.numbers['state'] or 100
-- todo: analyzers per script/lang, cross font, so we need an font id hash -> script
-- e.g. latin -> hyphenate, arab -> 1/2/3 analyze
-- an example analyzer
function fonts.analyzers.aux.setstate(head,font)
local characters = fontdata[font].characters
local first, last, current, n, done = nil, nil, head, 0, false -- maybe make n boolean
while current do
if current.id == glyph and current.font == font then
local c = characters[current.char]
if c then
if c.description.class == "mark" then
done = true
set_attribute(current,state,5) -- mark
elseif n == 0 then
first, last, n = current, current, 1
set_attribute(current,state,1) -- init
else
last, n = current, n+1
set_attribute(current,state,2) -- medi
end
else -- finish
if first and first == last then
set_attribute(last,state,4) -- isol
elseif last then
set_attribute(last,state,3) -- fina
end
first, last, n = nil, nil, 0
end
else -- finish
if first and first == last then
set_attribute(last,state,4) -- isol
elseif last then
set_attribute(last,state,3) -- fina
end
first, last, n = nil, nil, 0
end
current = current.next
end
if first and first == last then
set_attribute(last,state,4) -- isol
elseif last then
set_attribute(last,state,3) -- fina
end
return head, done
end
end
--[[ldx--
<p>We move marks into the components list. This saves much nasty testing later on.</p>
--ldx]]--
do
local glyph = node.id('glyph')
local fontdata = fonts.tfm.id
local marknumber = attributes.numbers['mark'] or 200
local set_attribute = node.set_attribute
function fonts.pushmarks(head,font)
local tfmdata = fontdata[font]
local characters = tfmdata.characters
local current, last, done, n = head, nil, false, 0
while current do
if current.id == glyph and current.font == font then
local c = characters[current.char]
if c and c.description.class == "mark" then
-- check if head
if last and not last.components then
last.components = current
current.prev = nil -- last.components.prev = nil
done = true
n = 1
else
n = n + 1
end
set_attribute(current,marknumber,n)
current = current.next
elseif last and last.components then
-- finish 'm
current.prev.next = nil
current.prev = last
last.next = current
last = current
last = nil
else
last = current
current = current.next
end
elseif last and last.components then
current.prev.next = nil
current.prev = last
last.next = current
last = nil
else
last = nil
current = current.next
end
end
if last and last.components then
last.next = nil
end
tfmdata.shared.markspushed = done
return head, done
end
function fonts.removemarks(head,font)
local current, done, characters = head, false, tfmdata.characters
while current do
if current.id == glyph and current.font == font and characters[current.char].description.class == "mark" then
local next, prev = current.next, current.prev
if next then
next.prev = prev
end
if prev then
prev.next = next
else
head = next
end
node.free(current)
current = next
done = true
else
current = current.next
end
end
return head, done
end
function fonts.popmarks(head,font)
local tfmdata = fontdata[font]
if tfmdata.shared.markspushed then
local current, done, characters = head, false, tfmdata.characters
while current do
if current.id == glyph and current.font == font then
local components = current.components
if components then
local last, next = components, current.next
while last.next do last = last.next end
if next then
next.prev = last
end
last.next= next
current.next = components
components.prev = current
current.components = nil
current = last.next
done = true
else
current = current.next
end
else
current = current.next
end
end
return head, done
else
return head, false
end
end
end
function fonts.tfm.replacements(tfm,value)
--~ tfm.characters[0x0022] = table.fastcopy(tfm.characters[0x201D])
--~ tfm.characters[0x0027] = table.fastcopy(tfm.characters[0x2019])
--~ tfm.characters[0x0060] = table.fastcopy(tfm.characters[0x2018])
--~ tfm.characters[0x0022] = tfm.characters[0x201D]
tfm.characters[0x0027] = tfm.characters[0x2019]
--~ tfm.characters[0x0060] = tfm.characters[0x2018]
end
-- 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
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