+ local fields = fontloader.fields
+ local function glyph_vmetric(glyph)
+ local flds = fields(glyph)
+ local vw, tsb, vk = nil, nil, nil
+ for _,i in ipairs(flds) do
+ if i=='vwidth' then vw = glyph.vwidth end
+ if i=='tsidebearing' then tsb = glyph.tsidebearing end
+ if i=='vkerns' then vk = glyph.vkerns end
+ end
+ return vw, tsb, vk
+ end
+
+ local sort = table.sort
+ local function add_fl_table(dest, glyphs, unitable, asc_des, units, id)
+ local glyphmin, glyphmax = glyphs.glyphmin, glyphs.glyphmax
+ if glyphmax < 0 then return dest end
+ local tg = glyphs.glyphs
+ for i = glyphmin, glyphmax 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
+ local uniq_flag = true
+ if dest and dest[bu] then
+ for i,_ in pairs(dest[bu]) do
+ if i==vsel then uniq_flag = false; break end
+ end
+ end
+ if uniq_flag then
+ dest = dest or {}; dest[bu] = dest[bu] or {}
+ dest[bu][vsel] = unitable[gv.name]
+ end
+ end
+ end
+ end
+ -- vertical form
+ local gi = unitable[gv.name]
+ if gi then
+ if unitable[gv.name .. '.vert'] then
+ dest = dest or {}; dest[gi] = dest[gi] or {};
+ dest[gi].vform = unitable[gv.name .. '.vert']
+ elseif id.characters[gi] and vert_form_table[gi] then
+ dest = dest or {}; dest[gi] = dest[gi] or {};
+ dest[gi].vform = vert_form_table[gi]
+ 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
+ if unitable[v.char] then
+ 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