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Diffstat (limited to 'src/luaotfload-fonts-inj.lua')
| -rw-r--r-- | src/luaotfload-fonts-inj.lua | 526 |
1 files changed, 526 insertions, 0 deletions
diff --git a/src/luaotfload-fonts-inj.lua b/src/luaotfload-fonts-inj.lua new file mode 100644 index 0000000..ae48150 --- /dev/null +++ b/src/luaotfload-fonts-inj.lua @@ -0,0 +1,526 @@ +if not modules then modules = { } end modules ['node-inj'] = { + version = 1.001, + comment = "companion to node-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files", +} + +-- This is very experimental (this will change when we have luatex > .50 and +-- a few pending thingies are available. Also, Idris needs to make a few more +-- test fonts. Btw, future versions of luatex will have extended glyph properties +-- that can be of help. Some optimizations can go away when we have faster machines. + +-- todo: make a special one for context + +local next = next +local utfchar = utf.char + +local trace_injections = false trackers.register("nodes.injections", function(v) trace_injections = v end) + +local report_injections = logs.reporter("nodes","injections") + +local attributes, nodes, node = attributes, nodes, node + +fonts = fonts +local fontdata = fonts.hashes.identifiers + +nodes.injections = nodes.injections or { } +local injections = nodes.injections + +local nodecodes = nodes.nodecodes +local glyph_code = nodecodes.glyph +local kern_code = nodecodes.kern +local nodepool = nodes.pool +local newkern = nodepool.kern + +local traverse_id = node.traverse_id +local insert_node_before = node.insert_before +local insert_node_after = node.insert_after + +local a_kernpair = attributes.private('kernpair') +local a_ligacomp = attributes.private('ligacomp') +local a_markbase = attributes.private('markbase') +local a_markmark = attributes.private('markmark') +local a_markdone = attributes.private('markdone') +local a_cursbase = attributes.private('cursbase') +local a_curscurs = attributes.private('curscurs') +local a_cursdone = attributes.private('cursdone') + +-- This injector has been tested by Idris Samawi Hamid (several arabic fonts as well as +-- the rather demanding Husayni font), Khaled Hosny (latin and arabic) and Kaj Eigner +-- (arabic, hebrew and thai) and myself (whatever font I come across). I'm pretty sure +-- that this code is not 100% okay but examples are needed to figure things out. + +function injections.installnewkern(nk) + newkern = nk or newkern +end + +local cursives = { } +local marks = { } +local kerns = { } + +-- Currently we do gpos/kern in a bit inofficial way but when we have the extra fields in +-- glyphnodes to manipulate ht/dp/wd explicitly I will provide an alternative; also, we +-- can share tables. + +-- For the moment we pass the r2l key ... volt/arabtype tests .. idris: this needs +-- checking with husayni (volt and fontforge). + +function injections.setcursive(start,nxt,factor,rlmode,exit,entry,tfmstart,tfmnext) + local dx, dy = factor*(exit[1]-entry[1]), factor*(exit[2]-entry[2]) + local ws, wn = tfmstart.width, tfmnext.width + local bound = #cursives + 1 + start[a_cursbase] = bound + nxt[a_curscurs] = bound + cursives[bound] = { rlmode, dx, dy, ws, wn } + return dx, dy, bound +end + +function injections.setpair(current,factor,rlmode,r2lflag,spec,tfmchr) + local x, y, w, h = factor*spec[1], factor*spec[2], factor*spec[3], factor*spec[4] + -- dy = y - h + if x ~= 0 or w ~= 0 or y ~= 0 or h ~= 0 then + local bound = current[a_kernpair] + if bound then + local kb = kerns[bound] + -- inefficient but singles have less, but weird anyway, needs checking + kb[2], kb[3], kb[4], kb[5] = (kb[2] or 0) + x, (kb[3] or 0) + y, (kb[4] or 0)+ w, (kb[5] or 0) + h + else + bound = #kerns + 1 + current[a_kernpair] = bound + kerns[bound] = { rlmode, x, y, w, h, r2lflag, tfmchr.width } + end + return x, y, w, h, bound + end + return x, y, w, h -- no bound +end + +function injections.setkern(current,factor,rlmode,x,tfmchr) + local dx = factor*x + if dx ~= 0 then + local bound = #kerns + 1 + current[a_kernpair] = bound + kerns[bound] = { rlmode, dx } + return dx, bound + else + return 0, 0 + end +end + +function injections.setmark(start,base,factor,rlmode,ba,ma,index,baseismark) -- ba=baseanchor, ma=markanchor + local dx, dy = factor*(ba[1]-ma[1]), factor*(ba[2]-ma[2]) -- the index argument is no longer used but when this + local bound = base[a_markbase] -- fails again we should pass it + local index = 1 + if bound then + local mb = marks[bound] + if mb then + -- if not index then index = #mb + 1 end + index = #mb + 1 + mb[index] = { dx, dy, rlmode } + start[a_markmark] = bound + start[a_markdone] = index + return dx, dy, bound + else + report_injections("possible problem, %U is base mark without data (id %a)",base.char,bound) + end + end +-- index = index or 1 + index = index or 1 + bound = #marks + 1 + base[a_markbase] = bound + start[a_markmark] = bound + start[a_markdone] = index + marks[bound] = { [index] = { dx, dy, rlmode, baseismark } } + return dx, dy, bound +end + +local function dir(n) + return (n and n<0 and "r-to-l") or (n and n>0 and "l-to-r") or "unset" +end + +local function trace(head) + report_injections("begin run") + for n in traverse_id(glyph_code,head) do + if n.subtype < 256 then + local kp = n[a_kernpair] + local mb = n[a_markbase] + local mm = n[a_markmark] + local md = n[a_markdone] + local cb = n[a_cursbase] + local cc = n[a_curscurs] + local char = n.char + report_injections("font %s, char %U, glyph %c",n.font,char,char) + if kp then + local k = kerns[kp] + if k[3] then + report_injections(" pairkern: dir %a, x %p, y %p, w %p, h %p",dir(k[1]),k[2],k[3],k[4],k[5]) + else + report_injections(" kern: dir %a, dx %p",dir(k[1]),k[2]) + end + end + if mb then + report_injections(" markbase: bound %a",mb) + end + if mm then + local m = marks[mm] + if mb then + local m = m[mb] + if m then + report_injections(" markmark: bound %a, index %a, dx %p, dy %p",mm,md,m[1],m[2]) + else + report_injections(" markmark: bound %a, missing index",mm) + end + else + m = m[1] + report_injections(" markmark: bound %a, dx %p, dy %p",mm,m and m[1],m and m[2]) + end + end + if cb then + report_injections(" cursbase: bound %a",cb) + end + if cc then + local c = cursives[cc] + report_injections(" curscurs: bound %a, dir %a, dx %p, dy %p",cc,dir(c[1]),c[2],c[3]) + end + end + end + report_injections("end run") +end + +-- todo: reuse tables (i.e. no collection), but will be extra fields anyway +-- todo: check for attribute + +-- We can have a fast test on a font being processed, so we can check faster for marks etc +-- but I'll make a context variant anyway. + +local function show_result(head) + local current = head + local skipping = false + while current do + local id = current.id + if id == glyph_code then + report_injections("char: %C, width %p, xoffset %p, yoffset %p",current.char,current.width,current.xoffset,current.yoffset) + skipping = false + elseif id == kern_code then + report_injections("kern: %p",current.kern) + skipping = false + elseif not skipping then + report_injections() + skipping = true + end + current = current.next + end +end + +function injections.handler(head,where,keep) + local has_marks, has_cursives, has_kerns = next(marks), next(cursives), next(kerns) + if has_marks or has_cursives then + if trace_injections then + trace(head) + end + -- in the future variant we will not copy items but refs to tables + local done, ky, rl, valid, cx, wx, mk, nofvalid = false, { }, { }, { }, { }, { }, { }, 0 + if has_kerns then -- move outside loop + local nf, tm = nil, nil + for n in traverse_id(glyph_code,head) do -- only needed for relevant fonts + if n.subtype < 256 then + nofvalid = nofvalid + 1 + valid[nofvalid] = n + if n.font ~= nf then + nf = n.font + tm = fontdata[nf].resources.marks + end + if tm then + mk[n] = tm[n.char] + end + local k = n[a_kernpair] + if k then + local kk = kerns[k] + if kk then + local x, y, w, h = kk[2] or 0, kk[3] or 0, kk[4] or 0, kk[5] or 0 + local dy = y - h + if dy ~= 0 then + ky[n] = dy + end + if w ~= 0 or x ~= 0 then + wx[n] = kk + end + rl[n] = kk[1] -- could move in test + end + end + end + end + else + local nf, tm = nil, nil + for n in traverse_id(glyph_code,head) do + if n.subtype < 256 then + nofvalid = nofvalid + 1 + valid[nofvalid] = n + if n.font ~= nf then + nf = n.font + tm = fontdata[nf].resources.marks + end + if tm then + mk[n] = tm[n.char] + end + end + end + end + if nofvalid > 0 then + -- we can assume done == true because we have cursives and marks + local cx = { } + if has_kerns and next(ky) then + for n, k in next, ky do + n.yoffset = k + end + end + -- todo: reuse t and use maxt + if has_cursives then + local p_cursbase, p = nil, nil + -- since we need valid[n+1] we can also use a "while true do" + local t, d, maxt = { }, { }, 0 + for i=1,nofvalid do -- valid == glyphs + local n = valid[i] + if not mk[n] then + local n_cursbase = n[a_cursbase] + if p_cursbase then + local n_curscurs = n[a_curscurs] + if p_cursbase == n_curscurs then + local c = cursives[n_curscurs] + if c then + local rlmode, dx, dy, ws, wn = c[1], c[2], c[3], c[4], c[5] + if rlmode >= 0 then + dx = dx - ws + else + dx = dx + wn + end + if dx ~= 0 then + cx[n] = dx + rl[n] = rlmode + end + -- if rlmode and rlmode < 0 then + dy = -dy + -- end + maxt = maxt + 1 + t[maxt] = p + d[maxt] = dy + else + maxt = 0 + end + end + elseif maxt > 0 then + local ny = n.yoffset + for i=maxt,1,-1 do + ny = ny + d[i] + local ti = t[i] + ti.yoffset = ti.yoffset + ny + end + maxt = 0 + end + if not n_cursbase and maxt > 0 then + local ny = n.yoffset + for i=maxt,1,-1 do + ny = ny + d[i] + local ti = t[i] + ti.yoffset = ny + end + maxt = 0 + end + p_cursbase, p = n_cursbase, n + end + end + if maxt > 0 then + local ny = n.yoffset + for i=maxt,1,-1 do + ny = ny + d[i] + local ti = t[i] + ti.yoffset = ny + end + maxt = 0 + end + if not keep then + cursives = { } + end + end + if has_marks then + for i=1,nofvalid do + local p = valid[i] + local p_markbase = p[a_markbase] + if p_markbase then + local mrks = marks[p_markbase] + local nofmarks = #mrks + for n in traverse_id(glyph_code,p.next) do + local n_markmark = n[a_markmark] + if p_markbase == n_markmark then + local index = n[a_markdone] or 1 + local d = mrks[index] + if d then + local rlmode = d[3] + -- + local k = wx[p] + if k then + local x = k[2] + local w = k[4] + if w then + if rlmode and rlmode >= 0 then + -- kern(x) glyph(p) kern(w-x) mark(n) + n.xoffset = p.xoffset - p.width + d[1] - (w-x) + else + -- kern(w-x) glyph(p) kern(x) mark(n) + n.xoffset = p.xoffset - d[1] - x + end + else + if rlmode and rlmode >= 0 then + -- okay for husayni + n.xoffset = p.xoffset - p.width + d[1] + else + -- needs checking: is x ok here? + n.xoffset = p.xoffset - d[1] - x + end + end + else + if rlmode and rlmode >= 0 then + n.xoffset = p.xoffset - p.width + d[1] + else + n.xoffset = p.xoffset - d[1] + end + local w = n.width + if w ~= 0 then + insert_node_before(head,n,newkern(-w/2)) + insert_node_after(head,n,newkern(-w/2)) + end + end + -- -- + if mk[p] then + n.yoffset = p.yoffset + d[2] + else + n.yoffset = n.yoffset + p.yoffset + d[2] + end + -- + if nofmarks == 1 then + break + else + nofmarks = nofmarks - 1 + end + end + else + -- KE: there can be <mark> <mkmk> <mark> sequences in ligatures + end + end + end + end + if not keep then + marks = { } + end + end + -- todo : combine + if next(wx) then + for n, k in next, wx do + -- only w can be nil (kernclasses), can be sped up when w == nil + local x = k[2] + local w = k[4] + if w then + local rl = k[1] -- r2l = k[6] + local wx = w - x + if rl < 0 then -- KE: don't use r2l here + if wx ~= 0 then + insert_node_before(head,n,newkern(wx)) -- type 0/2 + end + if x ~= 0 then + insert_node_after (head,n,newkern(x)) -- type 0/2 + end + else + if x ~= 0 then + insert_node_before(head,n,newkern(x)) -- type 0/2 + end + if wx ~= 0 then + insert_node_after (head,n,newkern(wx)) -- type 0/2 + end + end + elseif x ~= 0 then + -- this needs checking for rl < 0 but it is unlikely that a r2l script + -- uses kernclasses between glyphs so we're probably safe (KE has a + -- problematic font where marks interfere with rl < 0 in the previous + -- case) + insert_node_before(head,n,newkern(x)) -- a real font kern, type 0 + end + end + end + if next(cx) then + for n, k in next, cx do + if k ~= 0 then + local rln = rl[n] + if rln and rln < 0 then + insert_node_before(head,n,newkern(-k)) -- type 0/2 + else + insert_node_before(head,n,newkern(k)) -- type 0/2 + end + end + end + end + if not keep then + kerns = { } + end + -- if trace_injections then + -- show_result(head) + -- end + return head, true + elseif not keep then + kerns, cursives, marks = { }, { }, { } + end + elseif has_kerns then + if trace_injections then + trace(head) + end + for n in traverse_id(glyph_code,head) do + if n.subtype < 256 then + local k = n[a_kernpair] + if k then + local kk = kerns[k] + if kk then + local rl, x, y, w = kk[1], kk[2] or 0, kk[3], kk[4] + if y and y ~= 0 then + n.yoffset = y -- todo: h ? + end + if w then + -- copied from above + -- local r2l = kk[6] + local wx = w - x + if rl < 0 then -- KE: don't use r2l here + if wx ~= 0 then + insert_node_before(head,n,newkern(wx)) + end + if x ~= 0 then + insert_node_after (head,n,newkern(x)) + end + else + if x ~= 0 then + insert_node_before(head,n,newkern(x)) + end + if wx ~= 0 then + insert_node_after(head,n,newkern(wx)) + end + end + else + -- simple (e.g. kernclass kerns) + if x ~= 0 then + insert_node_before(head,n,newkern(x)) + end + end + end + end + end + end + if not keep then + kerns = { } + end + -- if trace_injections then + -- show_result(head) + -- end + return head, true + else + -- no tracing needed + end + return head, false +end |