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274
luametalatex-pdf-font.lua
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274
luametalatex-pdf-font.lua
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local mapping = require'luametalatex-pdf-font-map'
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mapping.mapfile'/usr/local/texlive/2019/texmf-var/fonts/map/pdftex/updmap/pdftex.map'
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local tounicode = {
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[-3] = require'luametalatex-pdf-font-cmap3',
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require'luametalatex-pdf-font-cmap1',
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require'luametalatex-pdf-font-cmap2',
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}
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local function allcids(fontdir)
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local cids = {}
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local scale = 1000/fontdir.size
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for i,v in pairs(fontdir.characters) do
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v.used = true
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cids[#cids+1] = {v.index or i, math.floor(v.width*scale+.5), v.tounicode}
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end
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return cids
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end
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local function buildW(f, usedcids)
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local used = #usedcids
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if used == 0 then return "" end
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local result = {}
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local index = 1
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while index <= used do
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local width = usedcids[index][2]
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local last = index
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while last ~= used and usedcids[last+1][2] == width do
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last = last + 1
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end
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if index == last then
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local span = {width}
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width = (usedcids[last+1] or {})[2]
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while (last + 2 <= used
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and usedcids[last+2][2] ~= width
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or last + 1 == used)
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and usedcids[last+1][1]-usedcids[last][1] <= 2 do
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for i=usedcids[last][1]+1,usedcids[last+1][1]-1 do
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span[#span+1] = 0
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end
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last = last + 1
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span[#span+1] = width
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width = (usedcids[last + 1] or {})[2]
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end
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result[#result+1] = string.format("%i[%s]", usedcids[index][1], table.concat(span, ' '))
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else
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result[#result+1] = string.format("%i %i %i ", usedcids[index][1], usedcids[last][1], width)
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end
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index = last + 1
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end
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return table.concat(result)
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end
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local function fontdescriptor(pdf, basefont, fontdir, stream, kind)
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local scale = 1000/fontdir.size
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return string.format(
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"<</Type/FontDescriptor/FontName/%s/Flags %i/FontBBox[%i %i %i %i]/ItalicAngle %i/Ascent %i/Descent %i/CapHeight %i/StemV %i/FontFile%s %i 0 R>>",
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basefont,
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4,-- FIXME: Flags ??? (4 means "symbolic")
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fontdir.bbox[1], fontdir.bbox[2], fontdir.bbox[3], fontdir.bbox[4], -- FIXME: How to determine BBox?
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math.floor(math.atan(fontdir.parameters.slant or fontdir.parameters[1] or 0, 0x10000)+.5),
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fontdir.bbox[4], fontdir.bbox[2],
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fontdir.parameters[8] and math.floor(fontdir.parameters[8]*scale+0.5) or fontdir.bbox[4],
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fontdir.StemV or 100, -- FIXME: How to determine StemV?
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kind, stream)
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end
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local function cidmap1byte(pdf)
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if not pdf.cidmap1byte then
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pdf.cidmap1byte = string.format(" %i 0 R", pdf:stream(nil, [[/Type/CMap/CMapName/Identity-8-H/CIDSystemInfo<</Registry(Adobe)/Ordering(Identity)/Supplement 0>>]],
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[[%!PS-Adobe-3.0 Resource-CMap
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%%DocumentNeededResources : ProcSet (CIDInit)
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%%IncludeResource : ProcSet (CIDInit)
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%%BeginResource : CMap (Identity-8-H)
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%%Title: (Custom 8bit Identity CMap)
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%%Version: 1.000
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%%EndComments
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/CIDInit /ProcSet findresource begin
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12 dict begin
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begincmap
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/CIDSystemInfo
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3 dict dup begin
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/Registry (Adobe) def
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/Ordering (Identity) def
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/Supplement 0 def
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end def
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/CMapName /Identity-8-H def
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/CMapVersion 1.000 def
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/CMapType 1 def
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/WMode 0 def
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1 begincodespacerange
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<00> <FF>
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endcodespacerange
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1 begincidrange
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<00> <FF> 0
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endcidrange
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endcmap
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CMapName currentdict /CMap defineresource pop
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end
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end
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%%EndResource
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%%EOF]]))
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end
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return pdf.cidmap1byte
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end
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local function cidmap3byte(pdf)
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if not pdf.cidmap3byte then
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pdf.cidmap3byte = string.format(" %i 0 R", pdf:stream(nil, [[/Type/CMap/CMapName/Identity-Var-H/CIDSystemInfo<</Registry(Adobe)/Ordering(Identity)/Supplement 0>>]],
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[[%!PS-Adobe-3.0 Resource-CMap
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%%DocumentNeededResources : ProcSet (CIDInit)
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%%IncludeResource : ProcSet (CIDInit)
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%%BeginResource : CMap (Identity-Var-H)
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%%Title: (Custom 8-24bit variable size Identity CMap)
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%%Version: 1.000
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%%EndComments
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/CIDInit /ProcSet findresource begin
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12 dict begin
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begincmap
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/CIDSystemInfo
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3 dict dup begin
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/Registry (Adobe) def
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/Ordering (Identity) def
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/Supplement 0 def
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end def
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/CMapName /Identity-Var-H def
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/CMapVersion 1.000 def
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/CMapType 1 def
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/WMode 0 def
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3 begincodespacerange
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<FF0000> <FF807F>
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<00> <7F>
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<8000> <FEFF>
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endcodespacerange
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3 begincidrange
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<00> <7F> 0
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<8000> <FEFF> 128
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<FF0000> <FF807F> 32640
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endcidrange
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endcmap
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CMapName currentdict /CMap defineresource pop
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end
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end
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%%EndResource
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%%EOF]]))
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end
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return pdf.cidmap3byte
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end
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local capitals = {string.byte("ABCDEFGHIJKLMNOPQRSTUVWXYZ", 1, -1)}
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local function gen_subsettagchar(i, left, ...)
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if left == 0 then return ... end
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return gen_subsettagchar(i//#capitals, left-1, capitals[i%#capitals+1], ...)
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end
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local function gen_subsettag(ident)
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local i = string.unpack("j", sha2.digest256(ident))
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return string.char(gen_subsettagchar(i, 7, 43))
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end
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local function buildfont0cff(pdf, fontdir, usedcids)
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local basefont = fontdir.psname or fontdir.fullname or fontdir.name -- FIXME: Subset-tag(?), Name-Escaping(?), fallback
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if fontdir.cff then
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cff = fontdir:cff(usedcids)
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else
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if fontdir.filename then
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if fontdir.format == "type1" then
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cff = require'luametalatex-pdf-font-t1'(fontdir.filename, fontdir.encoding)(fontdir, usedcids)
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elseif fontdir.format == "opentype" then
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cff = require'luametalatex-pdf-font-cff'(fontdir.filename, fontdir.encodingbytes == 1 and (fontdir.encoding or true))(fontdir, usedcids)
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else
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error[[Unsupported format]]
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end
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else
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return string.format("<</Type/Font/Subtype/Type1/BaseFont/%s/FontDescriptor %i 0 R/FirstChar %i/LastChar %i>>", basefont, -42, usedcids[1][1], usedcids[#usedcids][1])
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end
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end
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local widths = buildW(fontdir, usedcids) -- Do this after generating the CFF to allow for extracting the widths from the font file
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basefont = gen_subsettag(widths)..basefont
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local cidfont = pdf:indirect(nil, string.format(
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"<</Type/Font/Subtype/CIDFontType0/BaseFont/%s/CIDSystemInfo<</Registry(Adobe)/Ordering(Identity)/Supplement 0>>/FontDescriptor %i 0 R/W[%s]>>",
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basefont,
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pdf:indirect(nil, fontdescriptor(pdf, basefont, fontdir, pdf:stream(nil, '/Subtype/CIDFontType0C', cff), 3)),
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widths
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))
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return basefont, cidfont
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end
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local function buildfont0ttf(pdf, fontdir, usedcids)
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local basefont = fontdir.psname or fontdir.fullname or fontdir.name -- FIXME: Subset-tag(?), Name-Escaping(?), fallback
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local ttf
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if fontdir.ttf then
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ttf = fontdir:ttf(usedcids) -- WARNING: If you implement this: You always have to add a .notdef glyph at index 0. This one is *not* included in usedcids
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else
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ttf = require'luametalatex-pdf-font-ttf'(fontdir.filename, 1, fontdir.encoding)(fontdir, usedcids)
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end
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local lastcid = -1
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local cidtogid = {}
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for i=1,#usedcids do
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cidtogid[2*i-1] = string.rep("\0\0", usedcids[i][1]-lastcid-1)
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cidtogid[2*i] = string.pack(">I2", i)
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lastcid = usedcids[i][1]
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end
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cidtogid = pdf:stream(nil, "", table.concat(cidtogid))
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local widths = buildW(fontdir, usedcids)
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basefont = gen_subsettag(widths)..basefont
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local cidfont = pdf:indirect(nil, string.format(
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"<</Type/Font/Subtype/CIDFontType2/BaseFont/%s/CIDSystemInfo<</Registry(Adobe)/Ordering(Identity)/Supplement 0>>/FontDescriptor %i 0 R/W[%s]/CIDToGIDMap %i 0 R>>",
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basefont,
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pdf:indirect(nil, fontdescriptor(pdf, basefont, fontdir, pdf:stream(nil, string.format('/Length1 %i', #ttf), ttf), 2)),
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widths,
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cidtogid
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))
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return basefont, cidfont
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end
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local function buildfont0(pdf, fontdir, usedcids)
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usedcids = usedcids or allcids(fontdir)
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table.sort(usedcids, function(a,b) return a[1]<b[1] end)
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local enc
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if fontdir.encodingbytes == 1 then
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enc = cidmap1byte(pdf)
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elseif true then -- FIXME: This should only be used for encodingbyzes == -3 (variable, max 3)
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fontdir.encodingbytes = -3 -- FIXME
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enc = cidmap3byte(pdf)
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else
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enc = "/Identity-H"
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end
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local basefont, cidfont = (fontdir.format == "truetype" and buildfont0ttf or buildfont0cff)(pdf, fontdir, usedcids)
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local touni = pdf:stream(nil, "", tounicode[fontdir.encodingbytes](fontdir, usedcids)) -- Done late to allow for defaults set from the font file
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return string.format(
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"<</Type/Font/Subtype/Type0/BaseFont/%s/Encoding%s/ToUnicode %i 0 R/DescendantFonts[%i 0 R]>>",
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basefont,
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enc,
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touni,
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cidfont)
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end
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local fontextensions = {
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ttf = {"truetype", "truetype fonts",},
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otf = {"opentype", "opentype fonts",},
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pfb = {"type1", "type1 fonts",},
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}
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fontextensions.cff = fontextensions.otf
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local fontformats = {
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fontextensions.pfb, fontextensions.otf, fontextensions.ttf,
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}
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return function(pdf, fontdir, usedcids)
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if fontdir.encodingbytes == 0 then fontdir.encodingbytes = nil end
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if fontdir.format == "unknown" or not fontdir.format or fontdir.encodingbytes == 1 then -- TODO: How to check this?
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fontdir.encodingbytes = fontdir.encodingbytes or 1
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local mapentry = mapping.fontmap[fontdir.name]
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if mapentry then
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local format = mapentry[3] and mapentry[3]:sub(-4, -4) == '.' and fontextensions[mapentry[3]:sub(-3, -1)]
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if format then
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fontdir.format = format[1]
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fontdir.filename = kpse.find_file(mapentry[3], format[2])
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if mapentry[4] then
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fontdir.encoding = kpse.find_file(mapentry[4], 'enc files')
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end
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goto format_set
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else
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for _, format in ipairs(fontformats) do
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local font = kpse.find_file(mapentry[3],format[2])
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if font then
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fontdir.format = "type1"
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fontdir.filename = font
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if mapentry[4] then
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fontdir.encoding = kpse.find_file(mapentry[4], 'enc files')
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end
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goto format_set
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end
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end
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end
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end
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fontdir.format = "type3"
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::format_set::
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else
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fontdir.encodingbytes = fontdir.encodingbytes or 2
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end
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if fontdir.format == "type3" then
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error[[Currently unsupported]] -- TODO
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else
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return buildfont0(pdf, fontdir, usedcids)
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end
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end
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