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|
if not modules then modules = { } end modules ['font-ext'] = {
version = 1.001,
comment = "companion to font-ini.mkiv and hand-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local next, type, tonumber = next, type, tonumber
local formatters = string.formatters
local byte = string.byte
local utfchar = utf.char
local context = context
local fonts = fonts
local utilities = utilities
local trace_protrusion = false trackers.register("fonts.protrusion", function(v) trace_protrusion = v end)
local trace_expansion = false trackers.register("fonts.expansion", function(v) trace_expansion = v end)
local report_expansions = logs.reporter("fonts","expansions")
local report_protrusions = logs.reporter("fonts","protrusions")
--[[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]]--
local handlers = fonts.handlers
local hashes = fonts.hashes
local otf = handlers.otf
local registerotffeature = handlers.otf.features.register
local registerafmfeature = handlers.afm.features.register
local fontdata = hashes.identifiers
local fontproperties = hashes.properties
local allocate = utilities.storage.allocate
local settings_to_array = utilities.parsers.settings_to_array
local getparameters = utilities.parsers.getparameters
local gettexdimen = tex.getdimen
local family_font = node.family_font
local setmetatableindex = table.setmetatableindex
local implement = interfaces.implement
-- -- -- -- -- --
-- shared
-- -- -- -- -- --
local function get_class_and_vector(tfmdata,value,where) -- "expansions"
local g_where = tfmdata.goodies and tfmdata.goodies[where]
local f_where = fonts[where]
local g_classes = g_where and g_where.classes
local f_classes = f_where and f_where.classes
local class = (g_classes and g_classes[value]) or (f_classes and f_classes[value])
if class then
local class_vector = class.vector
local g_vectors = g_where and g_where.vectors
local f_vectors = f_where and f_where.vectors
local vector = (g_vectors and g_vectors[class_vector]) or (f_vectors and f_vectors[class_vector])
return class, vector
end
end
-- -- -- -- -- --
-- expansion (hz)
-- -- -- -- -- --
local expansions = fonts.expansions or allocate()
fonts.expansions = expansions
local classes = expansions.classes or allocate()
local vectors = expansions.vectors or allocate()
expansions.classes = classes
expansions.vectors = vectors
-- beware, pdftex itself uses percentages * 10
--
-- todo: get rid of byte() here
classes.preset = { stretch = 2, shrink = 2, step = .5, factor = 1 }
classes['quality'] = {
stretch = 2, shrink = 2, step = .5, vector = 'default', factor = 1
}
vectors['default'] = {
[byte('A')] = 0.5, [byte('B')] = 0.7, [byte('C')] = 0.7, [byte('D')] = 0.5, [byte('E')] = 0.7,
[byte('F')] = 0.7, [byte('G')] = 0.5, [byte('H')] = 0.7, [byte('K')] = 0.7, [byte('M')] = 0.7,
[byte('N')] = 0.7, [byte('O')] = 0.5, [byte('P')] = 0.7, [byte('Q')] = 0.5, [byte('R')] = 0.7,
[byte('S')] = 0.7, [byte('U')] = 0.7, [byte('W')] = 0.7, [byte('Z')] = 0.7,
[byte('a')] = 0.7, [byte('b')] = 0.7, [byte('c')] = 0.7, [byte('d')] = 0.7, [byte('e')] = 0.7,
[byte('g')] = 0.7, [byte('h')] = 0.7, [byte('k')] = 0.7, [byte('m')] = 0.7, [byte('n')] = 0.7,
[byte('o')] = 0.7, [byte('p')] = 0.7, [byte('q')] = 0.7, [byte('s')] = 0.7, [byte('u')] = 0.7,
[byte('w')] = 0.7, [byte('z')] = 0.7,
[byte('2')] = 0.7, [byte('3')] = 0.7, [byte('6')] = 0.7, [byte('8')] = 0.7, [byte('9')] = 0.7,
}
vectors['quality'] = vectors['default'] -- metatable ?
local function initializeexpansion(tfmdata,value)
if value then
local class, vector = get_class_and_vector(tfmdata,value,"expansions")
if class then
if vector then
local stretch = class.stretch or 0
local shrink = class.shrink or 0
local step = class.step or 0
local factor = class.factor or 1
if trace_expansion then
report_expansions("setting class %a, vector %a, factor %a, stretch %a, shrink %a, step %a",
value,class.vector,factor,stretch,shrink,step)
end
tfmdata.parameters.expansion = {
stretch = 10 * stretch,
shrink = 10 * shrink,
step = 10 * step,
factor = factor,
auto = true,
}
local data = characters and characters.data
for i, chr in next, tfmdata.characters do
local v = vector[i]
if data and not v then -- we could move the data test outside (needed for plain)
local d = data[i]
if d then
local s = d.shcode
if not s then
-- sorry
elseif type(s) == "table" then
v = ((vector[s[1]] or 0) + (vector[s[#s]] or 0)) / 2
else
v = vector[s] or 0
end
end
end
if v and v ~= 0 then
chr.expansion_factor = v*factor
else -- can be option
chr.expansion_factor = factor
end
end
elseif trace_expansion then
report_expansions("unknown vector %a in class %a",class.vector,value)
end
elseif trace_expansion then
report_expansions("unknown class %a",value)
end
end
end
local expansion_specification = {
name = "expansion",
description = "apply hz optimization",
initializers = {
base = initializeexpansion,
node = initializeexpansion,
}
}
registerotffeature(expansion_specification)
registerafmfeature(expansion_specification)
fonts.goodies.register("expansions", function(...) return fonts.goodies.report("expansions", trace_expansion, ...) end)
implement {
name = "setupfontexpansion",
arguments = { "string", "string" },
actions = function(class,settings) getparameters(classes,class,'preset',settings) end
}
-- -- -- -- -- --
-- protrusion
-- -- -- -- -- --
fonts.protrusions = allocate()
local protrusions = fonts.protrusions
protrusions.classes = allocate()
protrusions.vectors = allocate()
local classes = protrusions.classes
local vectors = protrusions.vectors
-- the values need to be revisioned
classes.preset = { factor = 1, left = 1, right = 1 }
classes['pure'] = {
vector = 'pure', factor = 1
}
classes['punctuation'] = {
vector = 'punctuation', factor = 1
}
classes['alpha'] = {
vector = 'alpha', factor = 1
}
classes['quality'] = {
vector = 'quality', factor = 1
}
vectors['pure'] = {
[0x002C] = { 0, 1 }, -- comma
[0x002E] = { 0, 1 }, -- period
[0x003A] = { 0, 1 }, -- colon
[0x003B] = { 0, 1 }, -- semicolon
[0x002D] = { 0, 1 }, -- hyphen
[0x00AD] = { 0, 1 }, -- also hyphen
[0x2013] = { 0, 0.50 }, -- endash
[0x2014] = { 0, 0.33 }, -- emdash
[0x3001] = { 0, 1 }, -- ideographic comma 、
[0x3002] = { 0, 1 }, -- ideographic full stop 。
[0x060C] = { 0, 1 }, -- arabic comma ،
[0x061B] = { 0, 1 }, -- arabic semicolon ؛
[0x06D4] = { 0, 1 }, -- arabic full stop ۔
}
vectors['punctuation'] = {
[0x003F] = { 0, 0.20 }, -- ?
[0x00BF] = { 0, 0.20 }, -- ¿
[0x0021] = { 0, 0.20 }, -- !
[0x00A1] = { 0, 0.20 }, -- ¡
[0x0028] = { 0.05, 0 }, -- (
[0x0029] = { 0, 0.05 }, -- )
[0x005B] = { 0.05, 0 }, -- [
[0x005D] = { 0, 0.05 }, -- ]
[0x002C] = { 0, 0.70 }, -- comma
[0x002E] = { 0, 0.70 }, -- period
[0x003A] = { 0, 0.50 }, -- colon
[0x003B] = { 0, 0.50 }, -- semicolon
[0x002D] = { 0, 0.70 }, -- hyphen
[0x00AD] = { 0, 0.70 }, -- also hyphen
[0x2013] = { 0, 0.30 }, -- endash
[0x2014] = { 0, 0.20 }, -- emdash
[0x060C] = { 0, 0.70 }, -- arabic comma
[0x061B] = { 0, 0.50 }, -- arabic semicolon
[0x06D4] = { 0, 0.70 }, -- arabic full stop
[0x061F] = { 0, 0.20 }, -- ؟
-- todo: left and right quotes: .5 double, .7 single
[0x2039] = { 0.70, 0.70 }, -- left single guillemet ‹
[0x203A] = { 0.70, 0.70 }, -- right single guillemet ›
[0x00AB] = { 0.50, 0.50 }, -- left guillemet «
[0x00BB] = { 0.50, 0.50 }, -- right guillemet »
[0x2018] = { 0.70, 0.70 }, -- left single quotation mark ‘
[0x2019] = { 0, 0.70 }, -- right single quotation mark ’
[0x201A] = { 0.70, 0 }, -- single low-9 quotation mark ,
[0x201B] = { 0.70, 0 }, -- single high-reversed-9 quotation mark ‛
[0x201C] = { 0.50, 0.50 }, -- left double quotation mark “
[0x201D] = { 0, 0.50 }, -- right double quotation mark ”
[0x201E] = { 0.50, 0 }, -- double low-9 quotation mark „
[0x201F] = { 0.50, 0 }, -- double high-reversed-9 quotation mark ‟
}
vectors['alpha'] = {
[byte("A")] = { .05, .05 },
[byte("F")] = { 0, .05 },
[byte("J")] = { .05, 0 },
[byte("K")] = { 0, .05 },
[byte("L")] = { 0, .05 },
[byte("T")] = { .05, .05 },
[byte("V")] = { .05, .05 },
[byte("W")] = { .05, .05 },
[byte("X")] = { .05, .05 },
[byte("Y")] = { .05, .05 },
[byte("k")] = { 0, .05 },
[byte("r")] = { 0, .05 },
[byte("t")] = { 0, .05 },
[byte("v")] = { .05, .05 },
[byte("w")] = { .05, .05 },
[byte("x")] = { .05, .05 },
[byte("y")] = { .05, .05 },
}
vectors['quality'] = table.merged(
vectors['punctuation'],
vectors['alpha']
)
-- As this is experimental code, users should not depend on it. The implications are still
-- discussed on the ConTeXt Dev List and we're not sure yet what exactly the spec is (the
-- next code is tested with a gyre font patched by / fea file made by Khaled Hosny). The
-- double trick should not be needed it proper hanging punctuation is used in which case
-- values < 1 can be used.
--
-- preferred (in context, usine vectors):
--
-- \definefontfeature[whatever][default][mode=node,protrusion=quality]
--
-- using lfbd and rtbd, with possibibility to enable only one side :
--
-- \definefontfeature[whocares][default][mode=node,protrusion=yes, opbd=yes,script=latn]
-- \definefontfeature[whocares][default][mode=node,protrusion=right,opbd=yes,script=latn]
--
-- idem, using multiplier
--
-- \definefontfeature[whocares][default][mode=node,protrusion=2,opbd=yes,script=latn]
-- \definefontfeature[whocares][default][mode=node,protrusion=double,opbd=yes,script=latn]
--
-- idem, using named feature file (less frozen):
--
-- \definefontfeature[whocares][default][mode=node,protrusion=2,opbd=yes,script=latn,featurefile=texgyrepagella-regularxx.fea]
classes['double'] = { -- for testing opbd
factor = 2, left = 1, right = 1,
}
local function map_opbd_onto_protrusion(tfmdata,value,opbd)
local characters = tfmdata.characters
local descriptions = tfmdata.descriptions
local properties = tfmdata.properties
local resources = tfmdata.resources
local rawdata = tfmdata.shared.rawdata
local lookuphash = rawdata.lookuphash
local lookuptags = resources.lookuptags
local script = properties.script
local language = properties.language
local done, factor, left, right = false, 1, 1, 1
local class = classes[value]
if class then
factor = class.factor or 1
left = class.left or 1
right = class.right or 1
else
factor = tonumber(value) or 1
end
if opbd ~= "right" then
local validlookups, lookuplist = otf.collectlookups(rawdata,"lfbd",script,language)
if validlookups then
for i=1,#lookuplist do
local lookup = lookuplist[i]
local steps = lookup.steps
if steps then
if trace_protrusion then
report_protrusions("setting left using lfbd")
end
for i=1,#steps do
local step = steps[i]
local coverage = step.coverage
if coverage then
for k, v in next, coverage do
-- local p = - v[3] / descriptions[k].width-- or 1 ~= 0 too but the same
local p = - (v[1] / 1000) * factor * left
characters[k].left_protruding = p
if trace_protrusion then
report_protrusions("lfbd -> %C -> %p",k,p)
end
end
end
end
done = true
end
end
end
end
if opbd ~= "left" then
local validlookups, lookuplist = otf.collectlookups(rawdata,"rtbd",script,language)
if validlookups then
for i=1,#lookuplist do
local lookup = lookuplist[i]
local steps = lookup.steps
if steps then
if trace_protrusion then
report_protrusions("setting right using rtbd")
end
for i=1,#steps do
local step = steps[i]
local coverage = step.coverage
if coverage then
for k, v in next, coverage do
-- local p = v[3] / descriptions[k].width -- or 3
local p = (v[1] / 1000) * factor * right
characters[k].right_protruding = p
if trace_protrusion then
report_protrusions("rtbd -> %C -> %p",k,p)
end
end
end
end
end
done = true
end
end
end
local parameters = tfmdata.parameters
local protrusion = tfmdata.protrusion
if not protrusion then
parameters.protrusion = {
auto = true
}
else
protrusion.auto = true
end
end
-- The opbd test is just there because it was discussed on the context development list. However,
-- the mentioned fxlbi.otf font only has some kerns for digits. So, consider this feature not supported
-- till we have a proper test font.
local function initializeprotrusion(tfmdata,value)
if value then
local opbd = tfmdata.shared.features.opbd
if opbd then
-- possible values: left right both yes no (experimental)
map_opbd_onto_protrusion(tfmdata,value,opbd)
else
local class, vector = get_class_and_vector(tfmdata,value,"protrusions")
if class then
if vector then
local factor = class.factor or 1
local left = class.left or 1
local right = class.right or 1
if trace_protrusion then
report_protrusions("setting class %a, vector %a, factor %a, left %a, right %a",
value,class.vector,factor,left,right)
end
local data = characters.data
local emwidth = tfmdata.parameters.quad
tfmdata.parameters.protrusion = {
factor = factor,
left = left,
right = right,
auto = true,
}
for i, chr in next, tfmdata.characters do
local v, pl, pr = vector[i], nil, nil
if v then
pl, pr = v[1], v[2]
else
local d = data[i]
if d then
local s = d.shcode
if not s then
-- sorry
elseif type(s) == "table" then
local vl, vr = vector[s[1]], vector[s[#s]]
if vl then pl = vl[1] end
if vr then pr = vr[2] end
else
v = vector[s]
if v then
pl, pr = v[1], v[2]
end
end
end
end
if pl and pl ~= 0 then
chr.left_protruding = left *pl*factor
end
if pr and pr ~= 0 then
chr.right_protruding = right*pr*factor
end
end
elseif trace_protrusion then
report_protrusions("unknown vector %a in class %a",class.vector,value)
end
elseif trace_protrusion then
report_protrusions("unknown class %a",value)
end
end
end
end
local protrusion_specification = {
name = "protrusion",
description = "l/r margin character protrusion",
initializers = {
base = initializeprotrusion,
node = initializeprotrusion,
}
}
registerotffeature(protrusion_specification)
registerafmfeature(protrusion_specification)
fonts.goodies.register("protrusions", function(...) return fonts.goodies.report("protrusions", trace_protrusion, ...) end)
implement {
name = "setupfontprotrusion",
arguments = { "string", "string" },
actions = function(class,settings) getparameters(classes,class,'preset',settings) end
}
-- -- --
local function initializenostackmath(tfmdata,value)
tfmdata.properties.nostackmath = value and true
end
registerotffeature {
name = "nostackmath",
description = "disable math stacking mechanism",
initializers = {
base = initializenostackmath,
node = initializenostackmath,
}
}
local function initializerealdimensions(tfmdata,value)
tfmdata.properties.realdimensions = value and true
end
registerotffeature {
name = "realdimensions",
description = "accept negative dimenions",
initializers = {
base = initializerealdimensions,
node = initializerealdimensions,
}
}
local function initializeitlc(tfmdata,value) -- hm, always value
if value then
-- the magic 40 and it formula come from Dohyun Kim but we might need another guess
local parameters = tfmdata.parameters
local italicangle = parameters.italicangle
if italicangle and italicangle ~= 0 then
local properties = tfmdata.properties
local factor = tonumber(value) or 1
properties.hasitalics = true
properties.autoitalicamount = factor * (parameters.uwidth or 40)/2
end
end
end
local italic_specification = {
name = "itlc",
description = "italic correction",
initializers = {
base = initializeitlc,
node = initializeitlc,
}
}
registerotffeature(italic_specification)
registerafmfeature(italic_specification)
local function initializetextitalics(tfmdata,value) -- yes no delay
tfmdata.properties.textitalics = toboolean(value)
end
local textitalics_specification = {
name = "textitalics",
description = "use alternative text italic correction",
initializers = {
base = initializetextitalics,
node = initializetextitalics,
}
}
registerotffeature(textitalics_specification)
registerafmfeature(textitalics_specification)
-- local function initializemathitalics(tfmdata,value) -- yes no delay
-- tfmdata.properties.mathitalics = toboolean(value)
-- end
--
-- local mathitalics_specification = {
-- name = "mathitalics",
-- description = "use alternative math italic correction",
-- initializers = {
-- base = initializemathitalics,
-- node = initializemathitalics,
-- }
-- }
-- registerotffeature(mathitalics_specification)
-- registerafmfeature(mathitalics_specification)
-- slanting
local function initializeslant(tfmdata,value)
value = tonumber(value)
if not value then
value = 0
elseif value > 1 then
value = 1
elseif value < -1 then
value = -1
end
tfmdata.parameters.slantfactor = value
end
local slant_specification = {
name = "slant",
description = "slant glyphs",
initializers = {
base = initializeslant,
node = initializeslant,
}
}
registerotffeature(slant_specification)
registerafmfeature(slant_specification)
local function initializeextend(tfmdata,value)
value = tonumber(value)
if not value then
value = 0
elseif value > 10 then
value = 10
elseif value < -10 then
value = -10
end
tfmdata.parameters.extendfactor = value
end
local extend_specification = {
name = "extend",
description = "scale glyphs horizontally",
initializers = {
base = initializeextend,
node = initializeextend,
}
}
registerotffeature(extend_specification)
registerafmfeature(extend_specification)
-- For Wolfgang Schuster:
--
-- \definefontfeature[thisway][default][script=hang,language=zhs,dimensions={2,2,2}]
-- \definedfont[file:kozminpr6nregular*thisway]
--
-- For the moment we don't mess with the descriptions.
local function manipulatedimensions(tfmdata,key,value)
if type(value) == "string" and value ~= "" then
local characters = tfmdata.characters
local parameters = tfmdata.parameters
local emwidth = parameters.quad
local exheight = parameters.xheight
local width = 0
local height = 0
local depth = 0
if value == "strut" then
height = gettexdimen("strutht")
depth = gettexdimen("strutdp")
else
local spec = settings_to_array(value)
width = (spec[1] or 0) * emwidth
height = (spec[2] or 0) * exheight
depth = (spec[3] or 0) * exheight
end
if width > 0 then
local resources = tfmdata.resources
local additions = { }
local private = resources.private
for unicode, old_c in next, characters do
local oldwidth = old_c.width
if oldwidth ~= width then
-- Defining the tables in one step is more efficient
-- than adding fields later.
private = private + 1
local new_c
local commands = {
{ "right", (width - oldwidth) / 2 },
{ "slot", 1, private },
}
if height > 0 then
if depth > 0 then
new_c = {
width = width,
height = height,
depth = depth,
commands = commands,
}
else
new_c = {
width = width,
height = height,
commands = commands,
}
end
else
if depth > 0 then
new_c = {
width = width,
depth = depth,
commands = commands,
}
else
new_c = {
width = width,
commands = commands,
}
end
end
setmetatableindex(new_c,old_c)
characters[unicode] = new_c
additions[private] = old_c
end
end
for k, v in next, additions do
characters[k] = v
end
resources.private = private
elseif height > 0 and depth > 0 then
for unicode, old_c in next, characters do
old_c.height = height
old_c.depth = depth
end
elseif height > 0 then
for unicode, old_c in next, characters do
old_c.height = height
end
elseif depth > 0 then
for unicode, old_c in next, characters do
old_c.depth = depth
end
end
end
end
local dimensions_specification = {
name = "dimensions",
description = "force dimensions",
manipulators = {
base = manipulatedimensions,
node = manipulatedimensions,
}
}
registerotffeature(dimensions_specification)
registerafmfeature(dimensions_specification)
-- for zhichu chen (see mailing list archive): we might add a few more variants
-- in due time
--
-- \definefontfeature[boxed][default][boundingbox=yes] % paleblue
--
-- maybe:
--
-- \definecolor[DummyColor][s=.75,t=.5,a=1] {\DummyColor test} \nopdfcompression
--
-- local gray = { "special", "pdf: /Tr1 gs .75 g" }
-- local black = { "special", "pdf: /Tr0 gs 0 g" }
-- sort of obsolete as we now have \showglyphs
local push = { "push" }
local pop = { "pop" }
local gray = { "special", "pdf: .75 g" }
local black = { "special", "pdf: 0 g" }
local downcache = { } -- handy for huge cjk fonts
local rulecache = { } -- handy for huge cjk fonts
setmetatableindex(downcache,function(t,d)
local v = { "down", d }
t[d] = v
return v
end)
setmetatableindex(rulecache,function(t,h)
local v = { }
t[h] = v
setmetatableindex(v,function(t,w)
local v = { "rule", h, w }
t[w] = v
return v
end)
return v
end)
local function showboundingbox(tfmdata,key,value)
if value then
local vfspecials = backends.pdf.tables.vfspecials
local gray = vfspecials and (vfspecials.rulecolors[value] or vfspecials.rulecolors.palegray) or gray
local characters = tfmdata.characters
local resources = tfmdata.resources
local additions = { }
local private = resources.private
for unicode, old_c in next, characters do
private = private + 1
local width = old_c.width or 0
local height = old_c.height or 0
local depth = old_c.depth or 0
local new_c
if depth == 0 then
new_c = {
width = width,
height = height,
commands = {
push,
gray,
rulecache[height][width],
black,
pop,
{ "slot", 1, private },
}
}
else
new_c = {
width = width,
height = height,
depth = depth,
commands = {
push,
downcache[depth],
gray,
rulecache[height+depth][width],
black,
pop,
{ "slot", 1, private },
}
}
end
setmetatableindex(new_c,old_c)
characters[unicode] = new_c
additions[private] = old_c
end
for k, v in next, additions do
characters[k] = v
end
resources.private = private
end
end
registerotffeature {
name = "boundingbox",
description = "show boundingbox",
manipulators = {
base = showboundingbox,
node = showboundingbox,
}
}
-- -- for notosans but not general
--
-- do
--
-- local v_local = interfaces and interfaces.variables and interfaces.variables["local"] or "local"
--
-- local utfbyte = utf.byte
--
-- local function initialize(tfmdata,key,value)
-- local characters = tfmdata.characters
-- local parameters = tfmdata.parameters
-- local oldchar = 32
-- local newchar = 32
-- if value == "locl" or value == v_local then
-- newchar = fonts.handlers.otf.getsubstitution(tfmdata,oldchar,"locl",true) or oldchar
-- elseif value == true then
-- -- use normal space
-- elseif value then
-- newchar = utfbyte(value)
-- else
-- return
-- end
-- local newchar = newchar and characters[newchar]
-- local newspace = newchar and newchar.width
-- if newspace > 0 then
-- parameters.space = newspace
-- parameters.space_stretch = newspace/2
-- parameters.space_shrink = newspace/3
-- parameters.extra_space = parameters.space_shrink
-- end
-- end
--
-- registerotffeature {
-- name = 'space', -- true|false|locl|character
-- description = 'space settings',
-- manipulators = {
-- base = initialize,
-- node = initialize,
-- }
-- }
--
-- end
-- -- historic stuff, move from font-ota (handled differently, typo-rep)
--
-- local delete_node = nodes.delete
-- local fontdata = fonts.hashes.identifiers
--
-- local nodecodes = nodes.nodecodes
-- local glyph_code = nodecodes.glyph
--
-- local strippables = allocate()
-- fonts.strippables = strippables
--
-- strippables.joiners = table.tohash {
-- 0x200C, -- zwnj
-- 0x200D, -- zwj
-- }
--
-- strippables.all = table.tohash {
-- 0x000AD, 0x017B4, 0x017B5, 0x0200B, 0x0200C, 0x0200D, 0x0200E, 0x0200F, 0x0202A, 0x0202B,
-- 0x0202C, 0x0202D, 0x0202E, 0x02060, 0x02061, 0x02062, 0x02063, 0x0206A, 0x0206B, 0x0206C,
-- 0x0206D, 0x0206E, 0x0206F, 0x0FEFF, 0x1D173, 0x1D174, 0x1D175, 0x1D176, 0x1D177, 0x1D178,
-- 0x1D179, 0x1D17A, 0xE0001, 0xE0020, 0xE0021, 0xE0022, 0xE0023, 0xE0024, 0xE0025, 0xE0026,
-- 0xE0027, 0xE0028, 0xE0029, 0xE002A, 0xE002B, 0xE002C, 0xE002D, 0xE002E, 0xE002F, 0xE0030,
-- 0xE0031, 0xE0032, 0xE0033, 0xE0034, 0xE0035, 0xE0036, 0xE0037, 0xE0038, 0xE0039, 0xE003A,
-- 0xE003B, 0xE003C, 0xE003D, 0xE003E, 0xE003F, 0xE0040, 0xE0041, 0xE0042, 0xE0043, 0xE0044,
-- 0xE0045, 0xE0046, 0xE0047, 0xE0048, 0xE0049, 0xE004A, 0xE004B, 0xE004C, 0xE004D, 0xE004E,
-- 0xE004F, 0xE0050, 0xE0051, 0xE0052, 0xE0053, 0xE0054, 0xE0055, 0xE0056, 0xE0057, 0xE0058,
-- 0xE0059, 0xE005A, 0xE005B, 0xE005C, 0xE005D, 0xE005E, 0xE005F, 0xE0060, 0xE0061, 0xE0062,
-- 0xE0063, 0xE0064, 0xE0065, 0xE0066, 0xE0067, 0xE0068, 0xE0069, 0xE006A, 0xE006B, 0xE006C,
-- 0xE006D, 0xE006E, 0xE006F, 0xE0070, 0xE0071, 0xE0072, 0xE0073, 0xE0074, 0xE0075, 0xE0076,
-- 0xE0077, 0xE0078, 0xE0079, 0xE007A, 0xE007B, 0xE007C, 0xE007D, 0xE007E, 0xE007F,
-- }
--
-- strippables[true] = strippables.joiners
--
-- local function processformatters(head,font)
-- local subset = fontdata[font].shared.features.formatters
-- local vector = subset and strippables[subset]
-- if vector then
-- local current, done = head, false
-- while current do
-- if current.id == glyph_code and current.subtype<256 and current.font == font then
-- local char = current.char
-- if vector[char] then
-- head, current = delete_node(head,current)
-- done = true
-- else
-- current = current.next
-- end
-- else
-- current = current.next
-- end
-- end
-- return head, done
-- else
-- return head, false
-- end
-- end
--
-- registerotffeature {
-- name = "formatters",
-- description = "hide formatting characters",
-- methods = {
-- base = processformatters,
-- node = processformatters,
-- }
-- }
-- not to be used! experimental code, only needed when testing
local is_letter = characters.is_letter
local always = true
local function collapseitalics(tfmdata,key,value)
local threshold = value == true and 100 or tonumber(value)
if threshold and threshold > 0 then
if threshold > 100 then
threshold = 100
end
for unicode, data in next, tfmdata.characters do
if always or is_letter[unicode] or is_letter[data.unicode] then
local italic = data.italic
if italic and italic ~= 0 then
local width = data.width
if width and width ~= 0 then
local delta = threshold * italic / 100
data.width = width + delta
data.italic = italic - delta
end
end
end
end
end
end
local dimensions_specification = {
name = "collapseitalics",
description = "collapse italics",
manipulators = {
base = collapseitalics,
node = collapseitalics,
}
}
registerotffeature(dimensions_specification)
registerafmfeature(dimensions_specification)
-- a handy helper (might change or be moved to another namespace)
local nodepool = nodes.pool
local new_glyph = nodepool.glyph
local helpers = fonts.helpers
local currentfont = font.current
local currentprivate = 0xE000
local maximumprivate = 0xEFFF
-- if we run out of space we can think of another range but by sharing we can
-- use these privates for mechanisms like alignments-on-character and such
local sharedprivates = setmetatableindex(function(t,k)
v = currentprivate
if currentprivate < maximumprivate then
currentprivate = currentprivate + 1
else
-- reuse last slot, todo: warning
end
t[k] = v
return v
end)
function helpers.addprivate(tfmdata,name,characterdata)
local properties = tfmdata.properties
local characters = tfmdata.characters
local privates = properties.privates
if not privates then
privates = { }
properties.privates = privates
end
if not name then
name = formatters["anonymous_private_0x%05X"](currentprivate)
end
local usedprivate = sharedprivates[name]
privates[name] = usedprivate
characters[usedprivate] = characterdata
return usedprivate
end
local function getprivateslot(id,name)
if not name then
name = id
id = currentfont()
end
local properties = fontproperties[id]
local privates = properties and properties.privates
return privates and privates[name]
end
local function getprivatenode(tfmdata,name)
if type(tfmdata) == "number" then
tfmdata = fontdata[tfmdata]
end
local properties = tfmdata.properties
local font = properties.id
local slot = getprivateslot(font,name)
if slot then
-- todo: set current attribibutes
local char = tfmdata.characters[slot]
local tonode = char.tonode
if tonode then
return tonode(font,char)
else
return new_glyph(font,slot)
end
end
end
local function getprivatecharornode(tfmdata,name)
if type(tfmdata) == "number" then
tfmdata = fontdata[tfmdata]
end
local properties = tfmdata.properties
local font = properties.id
local slot = getprivateslot(font,name)
if slot then
-- todo: set current attribibutes
local char = tfmdata.characters[slot]
local tonode = char.tonode
if tonode then
return "node", tonode(tfmdata,char)
else
return "char", slot
end
end
end
helpers.getprivateslot = getprivateslot
helpers.getprivatenode = getprivatenode
helpers.getprivatecharornode = getprivatecharornode
function helpers.getprivates(tfmdata)
if type(tfmdata) == "number" then
tfmdata = fontdata[tfmdata]
end
local properties = tfmdata.properties
return properties and properties.privates
end
function helpers.hasprivate(tfmdata,name)
if type(tfmdata) == "number" then
tfmdata = fontdata[tfmdata]
end
local properties = tfmdata.properties
local privates = properties and properties.privates
return privates and privates[name] or false
end
-- relatively new:
do
local extraprivates = { }
function fonts.helpers.addextraprivate(name,f)
extraprivates[#extraprivates+1] = { name, f }
end
local function addextraprivates(tfmdata)
for i=1,#extraprivates do
local e = extraprivates[i]
local c = e[2](tfmdata)
if c then
fonts.helpers.addprivate(tfmdata, e[1], c)
end
end
end
fonts.constructors.newfeatures.otf.register {
name = "extraprivates",
description = "extra privates",
default = true,
manipulators = {
base = addextraprivates,
node = addextraprivates,
}
}
end
implement {
name = "getprivatechar",
arguments = "string",
actions = function(name)
local p = getprivateslot(name)
if p then
context(utfchar(p))
end
end
}
implement {
name = "getprivatemathchar",
arguments = "string",
actions = function(name)
local p = getprivateslot(family_font(0),name)
if p then
context(utfchar(p))
end
end
}
implement {
name = "getprivateslot",
arguments = "string",
actions = function(name)
local p = getprivateslot(name)
if p then
context(p)
end
end
}
-- requested for latex but not supported unless really needed in context:
--
-- registerotffeature {
-- name = "ignoremathconstants",
-- description = "ignore math constants table",
-- initializers = {
-- base = function(tfmdata,value)
-- if value then
-- tfmdata.mathparameters = nil
-- end
-- end
-- }
-- }
-- tfmdata.properties.mathnolimitsmode = tonumber(value) or 0
do
local splitter = lpeg.splitat(",",tonumber)
local lpegmatch = lpeg.match
local function initialize(tfmdata,value)
local mathparameters = tfmdata.mathparameters
if mathparameters then
local sup, sub
if type(value) == "string" then
sup, sub = lpegmatch(splitter,value)
if not sup then
sub, sup = 0, 0
elseif not sub then
sub, sup = sup, 0
end
elseif type(value) == "number" then
sup, sub = 0, value
end
mathparameters.NoLimitSupFactor = sup
mathparameters.NoLimitSubFactor = sub
end
end
registerotffeature {
name = "mathnolimitsmode",
description = "influence nolimits placement",
initializers = {
base = initialize,
node = initialize,
}
}
end
do
local function initialize(tfmdata,value)
local properties = tfmdata.properties
if properties then
properties.identity = value == "vertical" and "vertical" or "horizontal"
end
end
registerotffeature {
name = "identity",
description = "set font identity",
initializers = {
base = initialize,
node = initialize,
}
}
local function initialize(tfmdata,value)
local properties = tfmdata.properties
if properties then
properties.writingmode = value == "vertical" and "vertical" or "horizontal"
end
end
registerotffeature {
name = "writingmode",
description = "set font direction",
initializers = {
base = initialize,
node = initialize,
}
}
end
do -- another hack for a crappy font
local function additalictowidth(tfmdata,key,value)
local characters = tfmdata.characters
local resources = tfmdata.resources
local additions = { }
local private = resources.private
for unicode, old_c in next, characters do
-- maybe check for math
local oldwidth = old_c.width
local olditalic = old_c.italic
if olditalic and olditalic ~= 0 then
private = private + 1
local new_c = {
width = oldwidth + olditalic,
height = old_c.height,
depth = old_c.depth,
commands = {
{ "slot", 1, private },
{ "right", olditalic },
},
}
setmetatableindex(new_c,old_c)
characters[unicode] = new_c
additions[private] = old_c
end
end
for k, v in next, additions do
characters[k] = v
end
resources.private = private
end
registerotffeature {
name = "italicwidths",
description = "add italic to width",
manipulators = {
base = additalictowidth,
-- node = additalictowidth, -- only makes sense for math
}
}
end
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