-- ltj-lotf_aux.lua
--
--- functions which access to fonts.* will be gathered in this file.
+-- functions which access to caches by luaotfload gathered in this file.
+-- lines with marked by "-- HARFLOAD" are codes for harfload
local aux = {}
luatexja.lotf_aux = aux
-local getfont
-do
- local font_getfont = font.getfont
- getfont = function (id) return (type(id)=="table") and id or font_getfont(id) end
-end
- -- accept font number or table
+local font_metric_table = {}
+aux.font_metric_table = font_metric_table
+
+local getfont = font.getfont
local provides_feature = luaotfload.aux.provides_feature
function aux.exist_feature(id, name)
local t = getfont(id)
local t = getfont(id)
if t and t.shared and t.shared.features then
t.shared.features[name] = true
+ elseif t and t.hb then -- HARF
+ local hb, tf = luaotfload.harfbuzz, t.hb.spec.hb_features
+ tf[#tf+1] = hb.Feature.new(name)
end
end
function aux.specified_feature(id, name)
local t = getfont(id)
- return (t and t.shared and t.shared.features and t.shared.features[name])
+ return t and (t.shared and t.shared.features and t.shared.features[name])
+ or (t.hb and t.hb.spec and t.hb.spec.features.raw and t.hb.spec.features.raw[name]) -- HARF
end
-local function get_ascender(id) -- scaled points
+
+do
+local nulltable = {}
+local function get_cidinfo(id) -- table
local t = getfont(id)
- return (t and t.parameters and t.parameters.ascender) or 0
+ local a = t and (t.cidinfo or (t.resources and t.resources and t.resources.cidinfo)) or nulltable
+ return a
+end
+aux.get_cidinfo = get_cidinfo
end
+
+local function get_asc_des(id)
+ local t, v = getfont(id), font_metric_table[id]
+ local a, d
+ if t and t.shared and t.shared.rawdata then
+ local u = t.units
+ local t2 = t.shared.rawdata.metadata
+ if t2 then
+ a, d = t2.ascender and t2.ascender/u, t2.descender and -t2.descender/u
+ end
+ elseif t.hb then -- HARF
+ local hbfont, u = t.hb.shared.font, t.hb.shared.upem
+ local h = hbfont:get_h_extents()
+ if h and u then
+ a, d = h.ascender and h.ascender/u, h.descender and -h.descender/u
+ end
+ end
+ v.ascender, v.descender = (a or 0.88)*t.size, (d or 0.12)*t.size
+end
+local function get_ascender(id) -- scaled points
+ if not font_metric_table[id].ascender then get_asc_des(id) end
+ return font_metric_table[id].ascender
+end
+
local function get_descender(id) -- scaled points
- local t = getfont(id)
- return (t and t.parameters and t.parameters.descender) or 0
+ if not font_metric_table[id].descender then get_asc_des(id) end
+ return font_metric_table[id].descender
end
aux.get_ascender, aux.get_descender = get_ascender, get_descender
-function aux.get_vheight(id, c) -- scaled points
- local t = getfont(id)
- if t and t.descriptions and t.descriptions[c] and t.descriptions[c].vheight then
- return t.descriptions[c].vheight / t.units * t.size
- elseif t and t.shared and t.shared.rawdata and t.shared.rawdata.metadata then
- return t.shared.rawdata.metadata.defaultvheight / t.units * t.size
- else
- return get_ascender(id) + get_descender(id)
+do
+local dummy_vht, dummy_vorg = {}, {}
+setmetatable(dummy_vht, {__index = function () return 1 end } )
+setmetatable(dummy_vorg, {__index = function () return 0.88 end } )
+local function get_vmet_table(tfmdata, dest)
+ if (not tfmdata) or (not tfmdata.shared) or (not tfmdata.shared.rawdata) then
+ dest = dest or {}
+ dest.vorigin, dest.vheight = dummy_vorg, dummy_vht
+ dest.ind_to_uni = {}
+ return dest
+ end
+ local rawdata = tfmdata.shared.rawdata
+ local ascender = rawdata.metadata.ascender or 0
+ local default_vheight
+ = rawdata.metadata.defaultvheight
+ or (rawdata.metadata.descender and (ascender+rawdata.metadata.descender) or units)
+ local units = tfmdata.units
+ local t_vorigin, t_vheight, t_ind_to_uni = {}, {}, {}
+ for i,v in pairs(rawdata.descriptions) do
+ t_ind_to_uni[v.index] = i
+ if v.tsb then
+ local j = v.boundingbox[4] + v.tsb
+ if j~=ascender then t_vorigin[i]= j / units end
+ end
+ if v.vheight then
+ if v.vheight~=default_vheight then t_vheight[i] = v.vheight / units end
+ end
+ end
+ setmetatable(t_vheight, {__index = function () return default_vheight / units end } )
+ setmetatable(t_vorigin, {__index = function () return ascender / units end } )
+ dest = dest or {}
+ dest.ind_to_uni = t_ind_to_uni
+ dest.vorigin = t_vorigin -- designed size = 1.0
+ dest.vheight = t_vheight -- designed size = 1.0
+ return dest
+end
+aux.get_vmet_table = get_vmet_table
+end
+local function loop_over_duplicates(id, func)
+-- func: return non-nil iff abort this fn
+ local t = (type(id)=="table") and id or getfont(id)
+ if t and t.resources and t.resources.duplicates then -- HARF: not executed
+ for i,v in pairs(t.resources.duplicates) do
+ func(i,v)
+ end
end
end
+aux.loop_over_duplicates = loop_over_duplicates
-local function loop_over_feat(id, feature_name, func)
+local function loop_over_feat(id, feature_name, func, universal)
-- feature_name: like { vert=true, vrt2 = true, ...}
-- func: return non-nil iff abort this fn
- local t = getfont(id)
- if t and t.resources and t.resources.sequences then
+-- universal: true iff look up all (script, lang) pair
+ local t = (type(id)=="table") and id or getfont(id)
+ if t and t.resources and t.resources.sequences then -- HARF: not executed
for _,i in pairs(t.resources.sequences) do
if i.order[1] and feature_name[i.order[1]] then
local f = i.features and i.features[i.order[1]]
if i.type == 'gsub_single' and i.steps
- and f and f[t.properties.script] and f[t.properties.script][t.properties.language] then
+ and f and (universal or (f[t.properties.script] and f[t.properties.script][t.properties.language])) then
for _,j in pairs(i.steps) do
if type(j)=='table' then
if type(j.coverage)=='table' then
end
+--for name, func in pairs(aux) do
+-- if type(func)=="function" then
+-- aux[name] = function(...)
+-- print('LOTF_AUX', name, ...);
+-- local a = func(...); print('RESULT', a); return a
+-- end
+-- end
+--end
local search
search = function (t, key, prefix)
if type(t)=="table" then
+ prefix = prefix or ''
for i,v in pairs(t) do
if i==key then print(prefix..'.'..i, v)
else search(v,key,prefix..'.'..tostring(i)) end
end
aux.t_search = search
+
+
-- EOF
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