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|
if not modules then modules = { } end modules ['font-otp'] = {
version = 1.001,
comment = "companion to font-otf.lua (packing)",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- todo: pack math (but not that much to share)
--
-- pitfall 5.2: hashed tables can suddenly become indexed with nil slots
local next, type = next, type
local sort, concat = table.sort, table.concat
local sortedhash = table.sortedhash
local trace_packing = false trackers.register("otf.packing", function(v) trace_packing = v end)
local trace_loading = false trackers.register("otf.loading", function(v) trace_loading = v end)
local report_otf = logs.reporter("fonts","otf loading")
-- also used in other scripts so we need to check some tables:
fonts = fonts or { }
local handlers = fonts.handlers or { }
fonts.handlers = handlers
local otf = handlers.otf or { }
handlers.otf = otf
local enhancers = otf.enhancers or { }
otf.enhancers = enhancers
local glists = otf.glists or { "gsub", "gpos" }
otf.glists = glists
local criterium = 1
local threshold = 0
local function tabstr_normal(t)
local s = { }
local n = 0
for k, v in next, t do
n = n + 1
if type(v) == "table" then
s[n] = k .. ">" .. tabstr_normal(v)
elseif v == true then
s[n] = k .. "+" -- "=true"
elseif v then
s[n] = k .. "=" .. v
else
s[n] = k .. "-" -- "=false"
end
end
if n == 0 then
return ""
elseif n == 1 then
return s[1]
else
sort(s) -- costly but needed (occasional wrong hit otherwise)
return concat(s,",")
end
end
local function tabstr_flat(t)
local s = { }
local n = 0
for k, v in next, t do
n = n + 1
s[n] = k .. "=" .. v
end
if n == 0 then
return ""
elseif n == 1 then
return s[1]
else
sort(s) -- costly but needed (occasional wrong hit otherwise)
return concat(s,",")
end
end
local function tabstr_mixed(t) -- indexed
local s = { }
local n = #t
if n == 0 then
return ""
elseif n == 1 then
local k = t[1]
if k == true then
return "++" -- we need to distinguish from "true"
elseif k == false then
return "--" -- we need to distinguish from "false"
else
return tostring(k) -- number or string
end
else
for i=1,n do
local k = t[i]
if k == true then
s[i] = "++" -- we need to distinguish from "true"
elseif k == false then
s[i] = "--" -- we need to distinguish from "false"
else
s[i] = k -- number or string
end
end
return concat(s,",")
end
end
local function tabstr_boolean(t)
local s = { }
local n = 0
for k, v in next, t do
n = n + 1
if v then
s[n] = k .. "+"
else
s[n] = k .. "-"
end
end
if n == 0 then
return ""
elseif n == 1 then
return s[1]
else
sort(s) -- costly but needed (occasional wrong hit otherwise)
return concat(s,",")
end
end
-- tabstr_boolean_x = tabstr_boolean
-- tabstr_boolean = function(t)
-- local a = tabstr_normal(t)
-- local b = tabstr_boolean_x(t)
-- print(a)
-- print(b)
-- return b
-- end
-- beware: we cannot unpack and repack the same table because then sharing
-- interferes (we could catch this if needed) .. so for now: save, reload
-- and repack in such cases (never needed anyway) .. a tricky aspect is that
-- we then need to sort more thanks to random hashing
local function packdata(data)
if data then
-- stripdata(data)
local h, t, c = { }, { }, { }
local hh, tt, cc = { }, { }, { }
local nt, ntt = 0, 0
local function pack_normal(v)
local tag = tabstr_normal(v)
local ht = h[tag]
if ht then
c[ht] = c[ht] + 1
return ht
else
nt = nt + 1
t[nt] = v
h[tag] = nt
c[nt] = 1
return nt
end
end
local function pack_flat(v)
local tag = tabstr_flat(v)
local ht = h[tag]
if ht then
c[ht] = c[ht] + 1
return ht
else
nt = nt + 1
t[nt] = v
h[tag] = nt
c[nt] = 1
return nt
end
end
local function pack_boolean(v)
local tag = tabstr_boolean(v)
local ht = h[tag]
if ht then
c[ht] = c[ht] + 1
return ht
else
nt = nt + 1
t[nt] = v
h[tag] = nt
c[nt] = 1
return nt
end
end
local function pack_indexed(v)
local tag = concat(v," ")
local ht = h[tag]
if ht then
c[ht] = c[ht] + 1
return ht
else
nt = nt + 1
t[nt] = v
h[tag] = nt
c[nt] = 1
return nt
end
end
local function pack_mixed(v)
local tag = tabstr_mixed(v)
local ht = h[tag]
if ht then
c[ht] = c[ht] + 1
return ht
else
nt = nt + 1
t[nt] = v
h[tag] = nt
c[nt] = 1
return nt
end
end
local function pack_final(v)
-- v == number
if c[v] <= criterium then
return t[v]
else
-- compact hash
local hv = hh[v]
if hv then
return hv
else
ntt = ntt + 1
tt[ntt] = t[v]
hh[v] = ntt
cc[ntt] = c[v]
return ntt
end
end
end
local function success(stage,pass)
if nt == 0 then
if trace_loading or trace_packing then
report_otf("pack quality: nothing to pack")
end
return false
elseif nt >= threshold then
local one, two, rest = 0, 0, 0
if pass == 1 then
for k,v in next, c do
if v == 1 then
one = one + 1
elseif v == 2 then
two = two + 1
else
rest = rest + 1
end
end
else
for k,v in next, cc do
if v > 20 then
rest = rest + 1
elseif v > 10 then
two = two + 1
else
one = one + 1
end
end
data.tables = tt
end
if trace_loading or trace_packing then
report_otf("pack quality: stage %s, pass %s, %s packed, 1-10:%s, 11-20:%s, rest:%s (criterium: %s)", stage, pass, one+two+rest, one, two, rest, criterium)
end
return true
else
if trace_loading or trace_packing then
report_otf("pack quality: stage %s, pass %s, %s packed, aborting pack (threshold: %s)", stage, pass, nt, threshold)
end
return false
end
end
local function packers(pass)
if pass == 1 then
return pack_normal, pack_indexed, pack_flat, pack_boolean, pack_mixed
else
return pack_final, pack_final, pack_final, pack_final, pack_final
end
end
local resources = data.resources
local lookuptypes = resources.lookuptypes
for pass=1,2 do
if trace_packing then
report_otf("start packing: stage 1, pass %s",pass)
end
local pack_normal, pack_indexed, pack_flat, pack_boolean, pack_mixed = packers(pass)
for unicode, description in next, data.descriptions do
local boundingbox = description.boundingbox
if boundingbox then
description.boundingbox = pack_indexed(boundingbox)
end
local slookups = description.slookups
if slookups then
for tag, slookup in next, slookups do
local what = lookuptypes[tag]
if what == "pair" then
local t = slookup[2] if t then slookup[2] = pack_indexed(t) end
local t = slookup[3] if t then slookup[3] = pack_indexed(t) end
elseif what ~= "substitution" then
slookups[tag] = pack_indexed(slookup) -- true is new
end
end
end
local mlookups = description.mlookups
if mlookups then
for tag, mlookup in next, mlookups do
local what = lookuptypes[tag]
if what == "pair" then
for i=1,#mlookup do
local lookup = mlookup[i]
local t = lookup[2] if t then lookup[2] = pack_indexed(t) end
local t = lookup[3] if t then lookup[3] = pack_indexed(t) end
end
elseif what ~= "substitution" then
for i=1,#mlookup do
mlookup[i] = pack_indexed(mlookup[i]) -- true is new
end
end
end
end
local kerns = description.kerns
if kerns then
for tag, kern in next, kerns do
kerns[tag] = pack_flat(kern)
end
end
local math = description.math
if math then
local kerns = math.kerns
if kerns then
for tag, kern in next, kerns do
kerns[tag] = pack_normal(kern)
end
end
end
local anchors = description.anchors
if anchors then
for what, anchor in next, anchors do
if what == "baselig" then
for _, a in next, anchor do
for k=1,#a do
a[k] = pack_indexed(a[k])
end
end
else
for k, v in next, anchor do
anchor[k] = pack_indexed(v)
end
end
end
end
local altuni = description.altuni
if altuni then
for i=1,#altuni do
altuni[i] = pack_flat(altuni[i])
end
end
end
local lookups = data.lookups
if lookups then
for _, lookup in next, lookups do
local rules = lookup.rules
if rules then
for i=1,#rules do
local rule = rules[i]
local r = rule.before if r then for i=1,#r do r[i] = pack_boolean(r[i]) end end
local r = rule.after if r then for i=1,#r do r[i] = pack_boolean(r[i]) end end
local r = rule.current if r then for i=1,#r do r[i] = pack_boolean(r[i]) end end
local r = rule.replacements if r then rule.replacements = pack_flat (r) end -- can have holes
local r = rule.lookups if r then rule.lookups = pack_indexed(r) end -- can have ""
-- local r = rule.lookups if r then rule.lookups = pack_flat(r) end -- can have holes (already taken care of some cases)
end
end
end
end
local anchor_to_lookup = resources.anchor_to_lookup
if anchor_to_lookup then
for anchor, lookup in next, anchor_to_lookup do
anchor_to_lookup[anchor] = pack_normal(lookup)
end
end
local lookup_to_anchor = resources.lookup_to_anchor
if lookup_to_anchor then
for lookup, anchor in next, lookup_to_anchor do
lookup_to_anchor[lookup] = pack_normal(anchor)
end
end
local sequences = resources.sequences
if sequences then
for feature, sequence in next, sequences do
local flags = sequence.flags
if flags then
sequence.flags = pack_normal(flags)
end
local subtables = sequence.subtables
if subtables then
sequence.subtables = pack_normal(subtables)
end
local features = sequence.features
if features then
for script, feature in next, features do
features[script] = pack_normal(feature)
end
end
local order = sequence.order
if order then
sequence.order = pack_indexed(order)
end
local markclass = sequence.markclass
if markclass then
sequence.markclass = pack_boolean(markclass)
end
end
end
local lookups = resources.lookups
if lookups then
for name, lookup in next, lookups do
local flags = lookup.flags
if flags then
lookup.flags = pack_normal(flags)
end
local subtables = lookup.subtables
if subtables then
lookup.subtables = pack_normal(subtables)
end
end
end
local features = resources.features
if features then
for _, what in next, glists do
local list = features[what]
if list then
for feature, spec in next, list do
list[feature] = pack_normal(spec)
end
end
end
end
if not success(1,pass) then
return
end
end
if nt > 0 then
for pass=1,2 do
if trace_packing then
report_otf("start packing: stage 2, pass %s",pass)
end
local pack_normal, pack_indexed, pack_flat, pack_boolean, pack_mixed = packers(pass)
for unicode, description in next, data.descriptions do
local kerns = description.kerns
if kerns then
description.kerns = pack_normal(kerns)
end
local math = description.math
if math then
local kerns = math.kerns
if kerns then
math.kerns = pack_normal(kerns)
end
end
local anchors = description.anchors
if anchors then
description.anchors = pack_normal(anchors)
end
local mlookups = description.mlookups
if mlookups then
for tag, mlookup in next, mlookups do
mlookups[tag] = pack_normal(mlookup)
end
end
local altuni = description.altuni
if altuni then
description.altuni = pack_normal(altuni)
end
end
local lookups = data.lookups
if lookups then
for _, lookup in next, lookups do
local rules = lookup.rules
if rules then
for i=1,#rules do -- was next loop
local rule = rules[i]
local r = rule.before if r then rule.before = pack_normal(r) end
local r = rule.after if r then rule.after = pack_normal(r) end
local r = rule.current if r then rule.current = pack_normal(r) end
end
end
end
end
local sequences = resources.sequences
if sequences then
for feature, sequence in next, sequences do
sequence.features = pack_normal(sequence.features)
end
end
if not success(2,pass) then
-- return
end
end
for pass=1,2 do
local pack_normal, pack_indexed, pack_flat, pack_boolean, pack_mixed = packers(pass)
for unicode, description in next, data.descriptions do
local slookups = description.slookups
if slookups then
description.slookups = pack_normal(slookups)
end
local mlookups = description.mlookups
if mlookups then
description.mlookups = pack_normal(mlookups)
end
end
end
end
end
end
local unpacked_mt = {
__index =
function(t,k)
t[k] = false
return k -- next time true
end
}
local function unpackdata(data)
if data then
local tables = data.tables
if tables then
local resources = data.resources
local lookuptypes = resources.lookuptypes
local unpacked = { }
setmetatable(unpacked,unpacked_mt)
for unicode, description in next, data.descriptions do
local tv = tables[description.boundingbox]
if tv then
description.boundingbox = tv
end
local slookups = description.slookups
if slookups then
local tv = tables[slookups]
if tv then
description.slookups = tv
slookups = unpacked[tv]
end
if slookups then
for tag, lookup in next, slookups do
local what = lookuptypes[tag]
if what == "pair" then
local tv = tables[lookup[2]]
if tv then
lookup[2] = tv
end
local tv = tables[lookup[3]]
if tv then
lookup[3] = tv
end
elseif what ~= "substitution" then
local tv = tables[lookup]
if tv then
slookups[tag] = tv
end
end
end
end
end
local mlookups = description.mlookups
if mlookups then
local tv = tables[mlookups]
if tv then
description.mlookups = tv
mlookups = unpacked[tv]
end
if mlookups then
for tag, list in next, mlookups do
local tv = tables[list]
if tv then
mlookups[tag] = tv
list = unpacked[tv]
end
if list then
local what = lookuptypes[tag]
if what == "pair" then
for i=1,#list do
local lookup = list[i]
local tv = tables[lookup[2]]
if tv then
lookup[2] = tv
end
local tv = tables[lookup[3]]
if tv then
lookup[3] = tv
end
end
elseif what ~= "substitution" then
for i=1,#list do
local tv = tables[list[i]]
if tv then
list[i] = tv
end
end
end
end
end
end
end
local kerns = description.kerns
if kerns then
local tm = tables[kerns]
if tm then
description.kerns = tm
kerns = unpacked[tm]
end
if kerns then
for k, kern in next, kerns do
local tv = tables[kern]
if tv then
kerns[k] = tv
end
end
end
end
local math = description.math
if math then
local kerns = math.kerns
if kerns then
local tm = tables[kerns]
if tm then
math.kerns = tm
kerns = unpacked[tm]
end
if kerns then
for k, kern in next, kerns do
local tv = tables[kern]
if tv then
kerns[k] = tv
end
end
end
end
end
local anchors = description.anchors
if anchors then
local ta = tables[anchors]
if ta then
description.anchors = ta
anchors = unpacked[ta]
end
if anchors then
for tag, anchor in next, anchors do
if tag == "baselig" then
for _, list in next, anchor do
for i=1,#list do
local tv = tables[list[i]]
if tv then
list[i] = tv
end
end
end
else
for a, data in next, anchor do
local tv = tables[data]
if tv then
anchor[a] = tv
end
end
end
end
end
end
local altuni = description.altuni
if altuni then
local altuni = tables[altuni]
if altuni then
description.altuni = altuni
for i=1,#altuni do
local tv = tables[altuni[i]]
if tv then
altuni[i] = tv
end
end
end
end
end
local lookups = data.lookups
if lookups then
for _, lookup in next, lookups do
local rules = lookup.rules
if rules then
for i=1,#rules do -- was next loop
local rule = rules[i]
local before = rule.before
if before then
local tv = tables[before]
if tv then
rule.before = tv
before = unpacked[tv]
end
if before then
for i=1,#before do
local tv = tables[before[i]]
if tv then
before[i] = tv
end
end
end
end
local after = rule.after
if after then
local tv = tables[after]
if tv then
rule.after = tv
after = unpacked[tv]
end
if after then
for i=1,#after do
local tv = tables[after[i]]
if tv then
after[i] = tv
end
end
end
end
local current = rule.current
if current then
local tv = tables[current]
if tv then
rule.current = tv
current = unpacked[tv]
end
if current then
for i=1,#current do
local tv = tables[current[i]]
if tv then
current[i] = tv
end
end
end
end
local replacements = rule.replacements
if replacements then
local tv = tables[replacements]
if tv then
rule.replacements = tv
end
end
-- local fore = rule.fore
-- if fore then
-- local tv = tables[fore]
-- if tv then
-- rule.fore = tv
-- end
-- end
-- local back = rule.back
-- if back then
-- local tv = tables[back]
-- if tv then
-- rule.back = tv
-- end
-- end
-- local names = rule.names
-- if names then
-- local tv = tables[names]
-- if tv then
-- rule.names = tv
-- end
-- end
--
local lookups = rule.lookups
if lookups then
local tv = tables[lookups]
if tv then
rule.lookups = tv
end
end
end
end
end
end
local anchor_to_lookup = resources.anchor_to_lookup
if anchor_to_lookup then
for anchor, lookup in next, anchor_to_lookup do
local tv = tables[lookup]
if tv then
anchor_to_lookup[anchor] = tv
end
end
end
local lookup_to_anchor = resources.lookup_to_anchor
if lookup_to_anchor then
for lookup, anchor in next, lookup_to_anchor do
local tv = tables[anchor]
if tv then
lookup_to_anchor[lookup] = tv
end
end
end
local ls = resources.sequences
if ls then
for _, feature in next, ls do
local flags = feature.flags
if flags then
local tv = tables[flags]
if tv then
feature.flags = tv
end
end
local subtables = feature.subtables
if subtables then
local tv = tables[subtables]
if tv then
feature.subtables = tv
end
end
local features = feature.features
if features then
local tv = tables[features]
if tv then
feature.features = tv
features = unpacked[tv]
end
if features then
for script, data in next, features do
local tv = tables[data]
if tv then
features[script] = tv
end
end
end
end
local order = feature.order
if order then
local tv = tables[order]
if tv then
feature.order = tv
end
end
local markclass = feature.markclass
if markclass then
local tv = tables[markclass]
if tv then
feature.markclass = tv
end
end
end
end
local lookups = resources.lookups
if lookups then
for _, lookup in next, lookups do
local flags = lookup.flags
if flags then
local tv = tables[flags]
if tv then
lookup.flags = tv
end
end
local subtables = lookup.subtables
if subtables then
local tv = tables[subtables]
if tv then
lookup.subtables = tv
end
end
end
end
local features = resources.features
if features then
for _, what in next, glists do
local feature = features[what]
if feature then
for tag, spec in next, feature do
local tv = tables[spec]
if tv then
feature[tag] = tv
end
end
end
end
end
data.tables = nil
end
end
end
if otf.enhancers.register then
otf.enhancers.register( "pack", packdata)
otf.enhancers.register("unpack",unpackdata)
-- todo: directive
end
otf.enhancers.unpack = unpackdata -- used elsewhere
otf.enhancers.pack = packdata -- used elsewhere
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