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--
-- src/ltj-setwidth.lua
--
luatexja.load_module('base'); local ltjb = luatexja.base
luatexja.load_module('stack'); local ltjs = luatexja.stack
luatexja.load_module('jfont'); local ltjf = luatexja.jfont
luatexja.load_module('direction'); local ltjd = luatexja.direction
local setfield = node.direct.setfield
local getfield = node.direct.getfield
local getid = node.direct.getid
local getfont = node.direct.getfont
local getlist = node.direct.getlist
local getchar = node.direct.getchar
local getsubtype = node.direct.getsubtype
local getdepth = node.direct.getdepth or function(n) return getfield(n,'depth') end
local getwhd = node.direct.getwhd or function(n)
return getfield(n,'width'), getfield(n,'height'),getfield(n,'depth') end
local setwhd = node.direct.setwhd or function(n,w,h,d)
setfield(n,'width',w); setfield(n,'height',h); setfield(n,'depth',d) end
local setchar = node.direct.setchar or function(n,c) setfield(n,'char',c) end
local setnext = node.direct.setnext or function(n,c) setfield(n,'next',c) end
local setdir = node.direct.setdir or function(n,c) setfield(n,'dir',c) end
local setoffsets = node.direct.setoffsets or function(n,x,y)
setfield(n,'xoffset',x); setfield(n,'yoffset',y) end
local getoffsets = node.direct.getoffsets or function(n)
return getfield(n,'xoffset'), getfield(n,'yoffset') end
local node_traverse_id = node.direct.traverse_id
local node_traverse = node.direct.traverse
local node_new = node.direct.new
local node_copy = node.direct.copy
local node_remove = node.direct.remove
local node_tail = node.direct.tail
local node_next = node.direct.getnext
local has_attr = node.direct.has_attribute
local set_attr = node.direct.set_attribute
local node_insert_before = node.direct.insert_before
local node_insert_after = node.direct.insert_after
local round = tex.round
local id_glyph = node.id('glyph')
local id_kern = node.id('kern')
local id_hlist = node.id('hlist')
local id_vlist = node.id('vlist')
local id_rule = node.id('rule')
local id_math = node.id('math')
local id_whatsit = node.id('whatsit')
local sid_save = node.subtype('pdf_save')
local sid_restore = node.subtype('pdf_restore')
local sid_matrix = node.subtype('pdf_setmatrix')
local dir_tate = luatexja.dir_table.dir_tate
local attr_ykblshift = luatexbase.attributes['ltj@ykblshift']
local attr_tkblshift = luatexbase.attributes['ltj@tkblshift']
local attr_icflag = luatexbase.attributes['ltj@icflag']
local ltjf_font_metric_table = ltjf.font_metric_table
local ltjf_font_extra_info = ltjf.font_extra_info
local PACKED = luatexja.icflag_table.PACKED
local PROCESSED = luatexja.icflag_table.PROCESSED
local get_pr_begin_flag
do
local PROCESSED_BEGIN_FLAG = luatexja.icflag_table.PROCESSED_BEGIN_FLAG
local floor = math.floor
get_pr_begin_flag = function (p)
local i = has_attr(p, attr_icflag) or 0
return i - i%PROCESSED_BEGIN_FLAG
end
end
local ltjw = {} --export
luatexja.setwidth = ltjw
luatexbase.create_callback("luatexja.set_width", "data",
function (fstable, fmtable, char_data)
return fstable
end)
local call_callback = luatexbase.call_callback
local fshift = { down = 0, left = 0}
local min, max = math.min, math.max
local rule_subtype = (status.luatex_version>=85) and 3 or 0
-- 和文文字の位置補正（横）
local function capsule_glyph_yoko(p, met, char_data, head, dir)
if not char_data then return node_next(p), head, p end
fshift.down = char_data.down; fshift.left = char_data.left
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 pwidth, pheight,pdepth = getwhd(p)
local fwidth = char_data.width or pwidth
local fheight= char_data.height or pheight
local fdepth = char_data.depth 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)
local xo, yo = getoffsets(p)
setoffsets(p, xo - fshift.left, yo - 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,rule_subtype)
local xo, yo = getoffsets(p)
setoffsets(p, xo, yo - kbl - fshift.down)
setwhd(box, 0, fheight - kbl, fdepth + kbl)
setdir(box, dir)
set_attr(box, attr_icflag, PACKED)
set_attr(p, attr_icflag, PROCESSED)
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
end
local q
head, q = node_remove(head, p)
local xo, yo = getoffsets(p)
setoffsets(p, xo + char_data.align*(fwidth-pwidth) - fshift.left,
yo - fshift.down);
setnext(p, nil)
local box = node_new(id_hlist)
setwhd(box, fwidth, fheight, fdepth)
setfield(box, 'head', p)
setfield(box, 'shift', kbl)
setdir(box, 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, box
end
luatexja.setwidth.capsule_glyph_yoko = capsule_glyph_yoko
-- 和文文字の位置補正（縦）
local function capsule_glyph_tate(p, met, char_data, head, dir)
if not char_data then return node_next(p), head end
local ascent, descent = met.ascent, met.descent
local fwidth, pwidth = char_data.width
do
local pf = getfont(p)
local pc = getchar(p)
setchar(p, pc)
pwidth = ltjf_font_extra_info[pf] and ltjf_font_extra_info[pf][pc]
and ltjf_font_extra_info[pf][pc].vwidth
and ltjf_font_extra_info[pf][pc].vwidth * met.size or (ascent+descent)
pwidth = pwidth + (met.v_advance[pc] or 0)
ascent = met.v_origin[pc] and ascent - met.v_origin[pc] or ascent
end
fwidth = fwidth or pwidth
fshift.down = char_data.down; fshift.left = char_data.left
fshift = call_callback("luatexja.set_width", fshift, met, char_data)
local fheight = char_data.height or 0
local fdepth = char_data.depth or 0
local xo, yo = getoffsets(p)
local y_shift = xo + (has_attr(p,attr_tkblshift) or 0)
local q
head, q = node_remove(head, p)
local box = node_new(id_hlist)
setwhd(box, fwidth, fheight, fdepth)
setfield(box, 'shift', y_shift)
setdir(box, dir)
setoffsets(p, -fshift.down,
yo -(ascent + char_data.align*(fwidth-pwidth) - fshift.left) )
local ws = node_new(id_whatsit, sid_save)
local wm = node_new(id_whatsit, sid_matrix)
setfield(wm, 'data', '0 1 -1 0')
local pwnh = -round(0.5*getfield(p, 'width'))
local k2 = node_new(id_kern, 1); setfield(k2, 'kern', pwnh)
local k3 = node_new(id_kern, 1); setfield(k3, 'kern', -getfield(p, 'width')-pwnh)
local wr = node_new(id_whatsit, sid_restore)
setfield(box, 'head', ws)
setnext(ws, wm); setnext(wm, k2);
setnext(k2, p); setnext(p, k3);
setnext(k3, wr);
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, box
end
luatexja.setwidth.capsule_glyph_tate = capsule_glyph_tate
local function capsule_glyph_math(p, met, char_data)
if not char_data then return nil end
local fwidth, pwidth = char_data.width, getfield(p, 'width')
fwidth = fwidth or pwidth
fshift.down = char_data.down; fshift.left = char_data.left
fshift = call_callback("luatexja.set_width", fshift, met, char_data)
local fheight, fdepth = char_data.height, char_data.depth
local y_shift
= - getfield(p, 'yoffset') + (has_attr(p,attr_ykblshift) or 0)
setfield(p, 'yoffset', -fshift.down)
setfield(p, 'xoffset', getfield(p, 'xoffset') + char_data.align*(fwidth-pwidth) - fshift.left)
local box = node_new(id_hlist);
setwhd(box, fwidth, fheight, fdepth)
setfield(box, 'head', p)
setfield(box, 'shift', y_shift)
setdir(box, tex.mathdir)
set_attr(box, attr_icflag, PACKED)
return box
end
luatexja.setwidth.capsule_glyph_math = capsule_glyph_math
-- 数式の位置補正
function luatexja.setwidth.apply_ashift_math(head, last, attr_ablshift)
for p in node_traverse(head) do
local pid = getid(p)
if p==last then
return
elseif (has_attr(p, attr_icflag) or 0) ~= PROCESSED then
if pid==id_hlist or pid==id_vlist then
setfield(p, 'shift', getfield(p, 'shift') + (has_attr(p,attr_ablshift) or 0))
elseif pid==id_rule then
local v = has_attr(p,attr_ablshift) or 0
setfield(p, 'height', getfield(p, 'height')-v)
setfield(p, 'depth', getdepth(p)+v)
set_attr(p, attr_icflag, PROCESSED)
elseif pid==id_glyph then
-- 欧文文字; 和文文字は pid == id_hlist の場合で処理される
-- (see conv_jchar_to_hbox_A in ltj-math.lua)
setfield(p, 'yoffset',
getfield(p, 'yoffset') - (has_attr(p,attr_ablshift) or 0))
end
set_attr(p, attr_icflag, PROCESSED)
end
end
end
-- discretionary の位置補正
do
local attr_yablshift = luatexbase.attributes['ltj@yablshift']
local attr_tablshift = luatexbase.attributes['ltj@tablshift']
local attr_ablshift
local disc, tex_dir
local function ashift_disc_inner(field)
local head = getfield(disc, field)
if not head then return end
local y_adjust, node_depth, adj_depth = 0, 0, 0
for lp in node_traverse_id(id_glyph, head) do
y_adjust = has_attr(lp,attr_ablshift) or 0
local ld = getdepth(lp)
node_depth = max(ld + min(y_adjust, 0), node_depth)
adj_depth = (y_adjust>0) and max(ld + y_adjust, adj_depth) or adj_depth
setfield(lp, 'yoffset', getfield(lp, 'yoffset') - y_adjust)
end
if adj_depth>node_depth then
local r = node_new(id_rule,rule_subtype)
setwhd(r, 0, 0, adj_depth); setdir(r, tex_dir)
set_attr(r, attr_icflag, PROCESSED)
if field=='post' then
node_insert_after(head, head, r)
else
setfield(disc, field, (node_insert_before(head, head, r)))
end
end
end
function luatexja.setwidth.apply_ashift_disc(d, is_dir_tate, dir)
attr_ablshift = is_dir_tate and attr_tablshift or attr_yablshift
disc, tex_dir = d, dir
ashift_disc_inner('pre')
ashift_disc_inner('post')
ashift_disc_inner('replace')
end
end
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