- fshift = call_callback("luatexja.set_width", fshift, met, class)
- local fheight, fdepth = char_data.height, char_data.depth
- if (pwidth ~= fwidth or getfield(p, 'height') ~= fheight
- or getfield(p, 'depth') ~= fdepth) then
- local y_shift
- = - getfield(p, 'yoffset') + (has_attr(p,attr_ykblshift) or 0)
- local q
- head, q = node_remove(head, p)
- setfield(p, 'yoffset', -fshift.down); setfield(p, 'next', nil)
- setfield(p, 'xoffset', getfield(p, 'xoffset')
- + char_data.align*(fwidth-pwidth) - fshift.left)
- local box = node_new(id_hlist)
- setfield(box, 'width', fwidth)
- setfield(box, 'height', fheight)
- setfield(box, 'depth', fdepth)
- setfield(box, 'head', p)
- setfield(box, 'shift', y_shift)
- setfield(box, 'dir', dir)
- set_attr(box, attr_icflag, PACKED)
- head = q and node_insert_before(head, q, box)
- or node_insert_after(head, node_tail(head), box)
- return q, head
- else
- set_attr(p, attr_icflag, PROCESSED)
- setfield(p, 'xoffset', getfield(p, 'xoffset') - fshift.left)
- setfield(p, 'yoffset', getfield(p, 'yoffset')
- - (has_attr(p, attr_ykblshift) or 0) - fshift.down)
- return node_next(p), head
+ fshift = call_callback("luatexja.set_width", fshift, met, char_data)
+ local kbl = has_attr(p, attr_ykblshift) or 0
+ --
+ -- f*: whd specified in JFM
+ local fwidth, pwidth = char_data.width, getfield(p, 'width')
+ fwidth = fwidth or pwidth
+ local fheight, pheight = char_data.height, getfield(p, 'height')
+ fheight = fheight or pheight
+ local fdepth, pdepth = char_data.depth,getfield(p, 'depth')
+ fdepth = fdepth or pdepth
+ if pwidth==fwidth then
+ -- 補正後glyph node は ht: p.height - kbl - down, dp: p.depth + min(0, kbl+down) を持つ
+ -- 設定されるべき寸法: ht: fheight - kbl, dp: fdepth + kbl
+ local ht_diff = fheight + fshift.down - pheight
+ local dp_diff = fdepth + kbl - pdepth - min(kbl + fshift.down, 0)
+ if ht_diff == 0 and dp_diff ==0 then -- offset only
+ set_attr(p, attr_icflag, PROCESSED)
+ setfield(p, 'xoffset', getfield(p, 'xoffset') - fshift.left)
+ setfield(p, 'yoffset', getfield(p, 'yoffset') - kbl - fshift.down)
+ return node_next(p), head, p
+ elseif ht_diff >= 0 and dp_diff >=0 then -- rule
+ local box = node_new(id_rule)
+ setfield(p, 'yoffset', getfield(p, 'yoffset') - kbl - fshift.down)
+ setfield(box, 'width', 0)
+ setfield(box, 'height', fheight - kbl)
+ setfield(box, 'depth', fdepth + kbl)
+ setfield(box, 'dir', dir)
+ set_attr(box, attr_icflag, PACKED)
+ --set_attr(p, attr_icflag, PACKED)
+ head = p and node_insert_before(head, p, box)
+ or node_insert_after(head, node_tail(head), box)
+ return node_next(p), head, p, box
+ end