--- extract jfm_file_name and jfm_var
-local function extract_metric(name)
- local basename=name
- local tmp = utf.sub(basename, 1, 5)
- jfm_file_name = ''; jfm_var = ''
- if tmp == 'file:' or tmp == 'name:' or tmp == 'psft:' then
- basename = utf.sub(basename, 6)
- end
- local p = utf.find(basename, ":")
- if p then
- basename = utf.sub(basename, p+1)
- else return
- end
- -- now basename contains 'features' only.
- p=1
- while p do
- local q = utf.find(basename, ";", p+1) or utf.len(basename)+1
- if utf.sub(basename, p, p+3)=='jfm=' and q>p+4 then
- jfm_file_name = utf.sub(basename, p+4, q-1)
- elseif utf.sub(basename, p, p+6)=='jfmvar=' and q>p+6 then
- jfm_var = utf.sub(basename, p+7, q-1)
- end
- if utf.len(basename)+1==q then p = nil else p = q + 1 end
- end
- return
+ local sort = table.sort
+ local function add_fl_table(dest, tg, unitable, glyphmax, asc_des, units)
+ for i = 0, glyphmax-1 do
+ local gv = tg[i]
+ if gv then
+ 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
+ dest = dest or {}; dest[bu] = dest[bu] or {}
+ local uniq_flag = true
+ for i,_ in pairs(dest[bu]) do
+ if i==vs then uniq_flag = false; break end
+ end
+ if uniq_flag then
+ dest[bu][vsel] = unitable[gv.name]
+ end
+ end
+ end
+ end
+ -- vertical metric
+ local vw, tsb, vk = glyph_vmetric(gv)
+ local gi = unitable[gv.name]
+ if gi and vw and vw~=asc_des then
+ -- We do not use tsidebearing, since (1) fontloader does not read VORG table
+ -- and (2) 'tsidebearing' doea not appear in the returned table by fontloader.fields.
+ -- Hence, we assume that vertical origin == ascender
+ -- (see capsule_glyph_tate in ltj-setwidth.lua)
+ dest = dest or {}; dest[gi] = dest[gi] or {}
+ dest[gi].vwidth = vw/units
+ end
+ -- vertical kern
+ if gi and vk then
+ dest = dest or {};
+ local dest_vk = dest.vkerns or {}; dest.vkerns = dest_vk
+ for _,v in pairs(vk) do
+ local vl = v.lookup
+ if type(vl)=='table' then
+ for _,vlt in pairs(vl) do
+ dest_vk[vlt] = dest_vk[vlt] or {}
+ dest_vk[vlt][gi] = dest_vk[vlt][gi] or {}
+ dest_vk[vlt][gi][unitable[v.char]] = v.off
+ end
+ else
+ dest_vk[vl] = dest_vk[vl] or {}
+ dest_vk[vl][gi] = dest_vk[vl][gi] or {}
+ dest_vk[vl][gi][unitable[v.char]] = v.off
+ end
+ end
+ end
+ end
+ end
+ return dest
+ end
+ prepare_fl_data = function (dest, id)
+ local fl = fontloader.open(id.filename)
+ local unicodes = id.resources.unicodes
+ if fl.glyphs then
+ dest = add_fl_table(dest, fl.glyphs, id.resources.unicodes, fl.glyphmax,
+ fl.ascent + fl.descent, fl.units_per_em)
+ end
+ if fl.subfonts then
+ for _,v in pairs(fl.subfonts) do
+ dest = add_fl_table(dest, v.glyphs, id.resources.unicodes, v.glyphmax,
+ fl.ascent + fl.descent, fl.units_per_em)
+ end
+ end
+ fontloader.close(fl); collectgarbage("collect")
+ return dest
+ end
+ -- supply vkern table
+ supply_vkern_table = function(id, bname)
+ local bx = font_extra_basename[bname].vkerns
+ local lookuphash = id.resources.lookuphash
+ local desc = id.shared.rawdata.descriptions
+ if bx then
+ for i,v in pairs(bx) do
+ lookuphash[i] = lookuphash[i] or v
+ for j,w in pairs(v) do
+ desc[j].kerns = desc[j].kerns or {}
+ desc[j].kerns[i] = w
+ end
+ end
+ end
+ end