- local ivs -- temp table
- local sort = table.sort
- local uniq_flag
- local function add_ivs_table(tg, unitable, glyphmax)
- for i = 0, glyphmax-1 do
- if tg[i] then
- local gv = tg[i]
- if gv.altuni then
- for _,at in pairs(gv.altuni) do
- local bu, vsel = at.unicode, at.variant
- if vsel then
- if vsel>=0xE0100 then vsel = vsel - 0xE0100 end
- if not ivs[bu] then ivs[bu] = {} end
- uniq_flag = true
- for i,_ in pairs(ivs[bu]) do
- if i==vs then uniq_flag = false; break end
- end
- if uniq_flag then
- ivs[bu][vsel] = unitable[gv.name]
- end
- end
- end
- end
- end
- end
- end
- local function make_ivs_table(id, fname)
- ivs = {}
- local fl = fontloader.open(fname)
- local unicodes = id.resources.unicodes
- if fl.glyphs then
- add_ivs_table(fl.glyphs, id.resources.unicodes, fl.glyphmax)
- end
- if fl.subfonts then
- for _,v in pairs(fl.subfonts) do
- add_ivs_table(v.glyphs, id.resources.unicodes, v.glyphmax)
- end
- end
- fontloader.close(fl)
- return ivs
- end
-
--- loading and saving
- local font_ivs_basename = {} -- key: basename
- local cache_ver = 4
- local checksum = file.checksum
-
- local function prepare_ivs_data(n, id)
- -- test if already loaded
- if type(id)=='number' then -- sometimes id is an integer
- font_ivs_table[n] = font_ivs_table[id]; return
- elseif not id then return
- end
- local fname = id.filename
- local bname = file.basename(fname)
- if not fname then
- font_ivs_table[n] = {}; return
- elseif font_ivs_basename[bname] then
- font_ivs_table[n] = font_ivs_basename[bname]; return
- end
-
- -- if the cache is present, read it
- local newsum = checksum(fname) -- MD5 checksum of the fontfile
- local v = "ivs_" .. string.lower(file.nameonly(fname))
- local dat = ltjb.load_cache(v,
- function (t) return (t.version~=cache_ver) or (t.chksum~=newsum) end
- )
- -- if the cache is not found or outdated, save the cache
- if dat then
- font_ivs_basename[bname] = dat[1] or {}
- else
- dat = make_ivs_table(id, fname)
- font_ivs_basename[bname] = dat or {}
- ltjb.save_cache( v,
- {
- chksum = checksum(fname),
- version = cache_ver,
- dat,
- })
- end
- font_ivs_table[n] = font_ivs_basename[bname]
- end
-