diff options
Diffstat (limited to 'tex/context/base/mkxl/lpdf-fnt.lmt')
| -rw-r--r-- | tex/context/base/mkxl/lpdf-fnt.lmt | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/tex/context/base/mkxl/lpdf-fnt.lmt b/tex/context/base/mkxl/lpdf-fnt.lmt new file mode 100644 index 000000000..ee16303b0 --- /dev/null +++ b/tex/context/base/mkxl/lpdf-fnt.lmt @@ -0,0 +1,194 @@ +if not modules then modules = { } end modules ['lpdf-fnt'] = { + version = 1.001, + comment = "companion to lpdf-ini.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +-- This is experimental code. + +local match, gmatch = string.match, string.gmatch +local tonumber, rawget = tonumber, rawget + +local pdfe = lpdf.epdf +local pdfreference = lpdf.reference + +local pdfreserveobject + +updaters.register("backend.update.lpdf",function() + pdfreserveobject = lpdf.reserveobject +end) + +local tobemerged = { } +local trace_merge = false trackers.register("graphics.fonts",function(v) trace_merge = v end) +local report_merge = logs.reporter("graphics","fonts") + +local function register(usedname,cleanname) + local cleanname = cleanname or fonts.names.cleanname(usedname) + local fontid = fonts.definers.internal { name = cleanname } + if fontid then + local objref = pdfreserveobject() + if trace_merge then + report_merge("registering %a with name %a, id %a and object %a",usedname,cleanname,fontid,objref) + end + return { + id = fontid, + reference = objref, + indices = { }, + cleanname = cleanname, + } + end + return false +end + +function lpdf.registerfont(usedname,cleanname) + local v = register(usedname,cleanname) + tobemerged[usedname] = v + return v +end + +table.setmetatableindex(tobemerged,function(t,k) + return lpdf.registerfont(k) +end) + +local function finalizefont(v) + local indextoslot = fonts.helpers.indextoslot + if v then + local id = v.id + local n = 0 + for i in next, v.indices do + local u = indextoslot(id,i) + n = n + 1 + end + v.n = n + end +end + +statistics.register("merged fonts", function() + if next(tobemerged) then + local t = { } + for k, v in table.sortedhash(tobemerged) do + t[#t+1] = string.formatters["%s (+%i)"](k,v.n) + end + return table.concat(t," ") + end +end) + +function lpdf.finalizefonts() + for k, v in next, tobemerged do + finalizefont(v) + end +end + +callback.register("font_descriptor_objnum_provider",function(name) + local m = rawget(tobemerged,name) + if m then + -- finalizefont(m) + local r = m.reference or 0 + if trace_merge then + report_merge("using object %a for font descriptor of %a",r,name) + end + return r + end + return 0 +end) + +local function getunicodes1(str,indices) + for s in gmatch(str,"beginbfrange%s*(.-)%s*endbfrange") do + for first, last, offset in gmatch(s,"<([^>]+)>%s+<([^>]+)>%s+<([^>]+)>") do + for i=tonumber(first,16),tonumber(last,16) do + indices[i] = true + end + end + end + for s in gmatch(str,"beginbfchar%s*(.-)%s*endbfchar") do + for old, new in gmatch(s,"<([^>]+)>%s+<([^>]+)>") do + indices[tonumber(old,16)] = true + end + end +end + +local function getunicodes2(widths,indices) + for i=1,#widths,2 do + local start = widths[i] + local count = #widths[i+1] + if start and count then + for i=start,start+count-1 do + indices[i] = true + end + end + end +end + +local function checkedfonts(pdfdoc,xref,copied,page) + local list = page.Resources.Font + local done = { } + for k, somefont in pdfe.expanded(list) do + if somefont.Subtype == "Type0" and somefont.Encoding == "Identity-H" then + local descendants = somefont.DescendantFonts + if descendants then + for i=1,#descendants do + local d = descendants[i] + if d then + local subtype = d.Subtype + if subtype == "CIDFontType0" or subtype == "CIDFontType2" then + local basefont = somefont.BaseFont + if basefont then + local fontname = match(basefont,"^[A-Z]+%+(.+)$") + local fontdata = tobemerged[fontname] + if fontdata then + local descriptor = d.FontDescriptor + if descriptor then + local okay = false + local widths = d.W + if widths then + getunicodes2(widths,fontdata.indices) + okay = true + else + local tounicode = somefont.ToUnicode + if tounicode then + getunicodes1(tounicode(),fontdata.indices) + okay = true + end + end + if okay then + local r = xref[descriptor] + done[r] = fontdata.reference + end + end + end + end + end + end + end + end + end + end + return next(done) and done +end + +function lpdf.epdf.plugin(pdfdoc,xref,copied,page) -- needs checking + local done = checkedfonts(pdfdoc,xref,copied,page) + if done then + return { + FontDescriptor = function(xref,copied,object,key,value,copyobject) + local r = value[3] + local d = done[r] + if d then + return pdfreference(d) + else + return copyobject(xref,copied,object,key,value) + end + end + } + end +end + +lpdf.registerdocumentfinalizer(lpdf.finalizefonts) + +-- already defined in font-ocl but the context variatn will go here +-- +-- function lpdf.vfimage(wd,ht,dp,data,name) +-- return { "image", { filename = name, width = wd, height = ht, depth = dp } } +-- end |