5 -- functions which access to caches by luaotfload gathered in this file.
6 -- lines with marked by "-- HARFLOAD" are codes for harfload
8 luatexja.lotf_aux = aux
10 local font_metric_table = {}
11 aux.font_metric_table = font_metric_table
13 local getfont = font.getfont
14 local provides_feature = luaotfload.aux.provides_feature
15 function aux.exist_feature(id, name)
17 if t and t.properties then
18 return provides_feature(id, t.properties.script, t.properties.language, name)
23 function aux.enable_feature(id, name)
25 if t and t.shared and t.shared.features then
26 t.shared.features[name] = true
27 elseif t and t.hb then -- HARF
28 local hb, tf = luaotfload.harfbuzz, t.hb.spec.hb_features
29 tf[#tf+1] = hb.Feature.new(name)
32 function aux.specified_feature(id, name)
34 return t and (t.shared and t.shared.features and t.shared.features[name])
35 or (t.hb and t.hb.spec and t.hb.spec.features.raw and t.hb.spec.features.raw[name]) -- HARF
41 local function get_cidinfo(id) -- table
43 local a = t and (t.cidinfo or (t.resources and t.resources and t.resources.cidinfo)) or nulltable
46 aux.get_cidinfo = get_cidinfo
49 local function get_asc_des(id)
50 local t, v = getfont(id), font_metric_table[id]
52 if t and t.shared and t.shared.rawdata then
54 local t2 = t.shared.rawdata.metadata
56 a, d = t2.ascender and t2.ascender/u, t2.descender and -t2.descender/u
58 elseif t.hb then -- HARF
59 local hbfont, u = t.hb.shared.font, t.hb.shared.upem
60 local h = hbfont:get_h_extents()
62 a, d = h.ascender and h.ascender/u, h.descender and -h.descender/u
65 v.ascender, v.descender = (a or 0.88)*t.size, (d or 0.12)*t.size
67 local function get_ascender(id) -- scaled points
68 if not font_metric_table[id].ascender then get_asc_des(id) end
69 return font_metric_table[id].ascender
72 local function get_descender(id) -- scaled points
73 if not font_metric_table[id].descender then get_asc_des(id) end
74 return font_metric_table[id].descender
76 aux.get_ascender, aux.get_descender = get_ascender, get_descender
79 local dummy_vht, dummy_vorg = {}, {}
80 setmetatable(dummy_vht, {__index = function () return 1 end } )
81 setmetatable(dummy_vorg, {__index = function () return 0.88 end } )
82 local function get_vmet_table(tfmdata, dest)
83 if (not tfmdata) or (not tfmdata.shared) or (not tfmdata.shared.rawdata) then
85 dest.vorigin, dest.vheight = dummy_vorg, dummy_vht
89 local rawdata = tfmdata.shared.rawdata
90 local ascender = rawdata.metadata.ascender or 0
92 = rawdata.metadata.defaultvheight
93 or (rawdata.metadata.descender and (ascender+rawdata.metadata.descender) or units)
94 local units = tfmdata.units
95 local t_vorigin, t_vheight, t_ind_to_uni = {}, {}, {}
96 for i,v in pairs(rawdata.descriptions) do
97 t_ind_to_uni[v.index] = i
99 local j = v.boundingbox[4] + v.tsb
100 if j~=ascender then t_vorigin[i]= j / units end
103 if v.vheight~=default_vheight then t_vheight[i] = v.vheight / units end
106 setmetatable(t_vheight, {__index = function () return default_vheight / units end } )
107 setmetatable(t_vorigin, {__index = function () return ascender / units end } )
109 dest.ind_to_uni = t_ind_to_uni
110 dest.vorigin = t_vorigin -- designed size = 1.0
111 dest.vheight = t_vheight -- designed size = 1.0
114 aux.get_vmet_table = get_vmet_table
116 local function loop_over_duplicates(id, func)
117 -- func: return non-nil iff abort this fn
118 local t = (type(id)=="table") and id or getfont(id)
119 if t and t.resources and t.resources.duplicates then -- HARF: not executed
120 for i,v in pairs(t.resources.duplicates) do
125 aux.loop_over_duplicates = loop_over_duplicates
127 local function loop_over_feat(id, feature_name, func, universal)
128 -- feature_name: like { vert=true, vrt2 = true, ...}
129 -- func: return non-nil iff abort this fn
130 -- universal: true iff look up all (script, lang) pair
131 local t = (type(id)=="table") and id or getfont(id)
132 if t and t.resources and t.resources.sequences then -- HARF: not executed
133 for _,i in pairs(t.resources.sequences) do
134 if i.order[1] and feature_name[i.order[1]] then
135 local f = i.features and i.features[i.order[1]]
136 if i.type == 'gsub_single' and i.steps
137 and f and (universal or (f[t.properties.script] and f[t.properties.script][t.properties.language])) then
138 for _,j in pairs(i.steps) do
139 if type(j)=='table' then
140 if type(j.coverage)=='table' then
141 for i,k in pairs(j.coverage) do
142 local s = func(i,k); if s then return s end
152 aux.loop_over_feat = loop_over_feat
154 local vert_vrt2 = { vert=true, vrt2=true }
155 function aux.replace_vert_variant(id, c)
156 return loop_over_feat(id, vert_vrt2,
157 function (i,k) if i==c then return k end end)
162 --for name, func in pairs(aux) do
163 -- if type(func)=="function" then
164 -- aux[name] = function(...)
165 -- print('LOTF_AUX', name, ...);
166 -- local a = func(...); print('RESULT', a); return a
172 search = function (t, key, prefix)
173 if type(t)=="table" then
174 prefix = prefix or ''
175 for i,v in pairs(t) do
176 if i==key then print(prefix..'.'..i, v)
177 else search(v,key,prefix..'.'..tostring(i)) end
181 aux.t_search = search