[fontloader] sync Context as of 2016-04-07

1 files changed, 1698 insertions, 0 deletions

diff --git a/src/fontloader/misc/fontloader-font-cff.lua b/src/fontloader/misc/fontloader-font-cff.lua
new file mode 100644
index 0000000..8c57b47
--- /dev/null
+++ b/src/fontloader/misc/fontloader-font-cff.lua
@@ -0,0 +1,1698 @@
+if not modules then modules = { } end modules ['font-cff'] = {
+    version   = 1.001,
+    comment   = "companion to font-ini.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+-- todo: option.outlines
+-- todo: option.boundingbox
+-- per charstring (less memory)
+
+-- This is a heavy one as it is a rather packed format. We don't need al the information
+-- now but we might need it later (who know what magic we can do with metapost). So at
+-- some point this might become a module. We just follow Adobe Technical Notes #5176 and
+-- #5177. In case of doubt I looked in the fontforge code that comes with LuaTeX.
+
+-- For now we save the segments in a list of segments with the operator last in an entry
+-- because that reflects the original. But it might make more sense to use a single array
+-- per segment. For pdf a simple concat works ok, but for other purposes a operator first
+-- flush is nicer.
+
+local next, type, tonumber = next, type, tonumber
+local byte = string.byte
+local concat, remove = table.concat, table.remove
+local floor, abs, round, ceil = math.floor, math.abs, math.round, math.ceil
+local P, C, R, S, C, Cs, Ct = lpeg.P, lpeg.C, lpeg.R, lpeg.S, lpeg.C, lpeg.Cs, lpeg.Ct
+local lpegmatch = lpeg.match
+
+local readers           = fonts.handlers.otf.readers
+local streamreader      = readers.streamreader
+
+local readbytes         = streamreader.readbytes
+local readstring        = streamreader.readstring
+local readbyte          = streamreader.readcardinal1  --  8-bit unsigned integer
+local readushort        = streamreader.readcardinal2  -- 16-bit unsigned integer
+local readuint          = streamreader.readcardinal3  -- 24-bit unsigned integer
+local readulong         = streamreader.readcardinal4  -- 24-bit unsigned integer
+local setposition       = streamreader.setposition
+local getposition       = streamreader.getposition
+
+local setmetatableindex = table.setmetatableindex
+
+local trace_charstrings = false trackers.register("fonts.cff.charstrings",function(v) trace_charstrings = v end)
+local report            = logs.reporter("otf reader","cff")
+
+local parsedictionaries
+local parsecharstring
+local parsecharstrings
+local resetcharstrings
+local parseprivates
+
+local defaultstrings = { [0] = -- taken from ff
+    ".notdef", "space", "exclam", "quotedbl", "numbersign", "dollar", "percent",
+    "ampersand", "quoteright", "parenleft", "parenright", "asterisk", "plus",
+    "comma", "hyphen", "period", "slash", "zero", "one", "two", "three", "four",
+    "five", "six", "seven", "eight", "nine", "colon", "semicolon", "less",
+    "equal", "greater", "question", "at", "A", "B", "C", "D", "E", "F", "G", "H",
+    "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W",
+    "X", "Y", "Z", "bracketleft", "backslash", "bracketright", "asciicircum",
+    "underscore", "quoteleft", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
+    "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y",
+    "z", "braceleft", "bar", "braceright", "asciitilde", "exclamdown", "cent",
+    "sterling", "fraction", "yen", "florin", "section", "currency",
+    "quotesingle", "quotedblleft", "guillemotleft", "guilsinglleft",
+    "guilsinglright", "fi", "fl", "endash", "dagger", "daggerdbl",
+    "periodcentered", "paragraph", "bullet", "quotesinglbase", "quotedblbase",
+    "quotedblright", "guillemotright", "ellipsis", "perthousand", "questiondown",
+    "grave", "acute", "circumflex", "tilde", "macron", "breve", "dotaccent",
+    "dieresis", "ring", "cedilla", "hungarumlaut", "ogonek", "caron", "emdash",
+    "AE", "ordfeminine", "Lslash", "Oslash", "OE", "ordmasculine", "ae",
+    "dotlessi", "lslash", "oslash", "oe", "germandbls", "onesuperior",
+    "logicalnot", "mu", "trademark", "Eth", "onehalf", "plusminus", "Thorn",
+    "onequarter", "divide", "brokenbar", "degree", "thorn", "threequarters",
+    "twosuperior", "registered", "minus", "eth", "multiply", "threesuperior",
+    "copyright", "Aacute", "Acircumflex", "Adieresis", "Agrave", "Aring",
+    "Atilde", "Ccedilla", "Eacute", "Ecircumflex", "Edieresis", "Egrave",
+    "Iacute", "Icircumflex", "Idieresis", "Igrave", "Ntilde", "Oacute",
+    "Ocircumflex", "Odieresis", "Ograve", "Otilde", "Scaron", "Uacute",
+    "Ucircumflex", "Udieresis", "Ugrave", "Yacute", "Ydieresis", "Zcaron",
+    "aacute", "acircumflex", "adieresis", "agrave", "aring", "atilde",
+    "ccedilla", "eacute", "ecircumflex", "edieresis", "egrave", "iacute",
+    "icircumflex", "idieresis", "igrave", "ntilde", "oacute", "ocircumflex",
+    "odieresis", "ograve", "otilde", "scaron", "uacute", "ucircumflex",
+    "udieresis", "ugrave", "yacute", "ydieresis", "zcaron", "exclamsmall",
+    "Hungarumlautsmall", "dollaroldstyle", "dollarsuperior", "ampersandsmall",
+    "Acutesmall", "parenleftsuperior", "parenrightsuperior", "twodotenleader",
+    "onedotenleader", "zerooldstyle", "oneoldstyle", "twooldstyle",
+    "threeoldstyle", "fouroldstyle", "fiveoldstyle", "sixoldstyle",
+    "sevenoldstyle", "eightoldstyle", "nineoldstyle", "commasuperior",
+    "threequartersemdash", "periodsuperior", "questionsmall", "asuperior",
+    "bsuperior", "centsuperior", "dsuperior", "esuperior", "isuperior",
+    "lsuperior", "msuperior", "nsuperior", "osuperior", "rsuperior", "ssuperior",
+    "tsuperior", "ff", "ffi", "ffl", "parenleftinferior", "parenrightinferior",
+    "Circumflexsmall", "hyphensuperior", "Gravesmall", "Asmall", "Bsmall",
+    "Csmall", "Dsmall", "Esmall", "Fsmall", "Gsmall", "Hsmall", "Ismall",
+    "Jsmall", "Ksmall", "Lsmall", "Msmall", "Nsmall", "Osmall", "Psmall",
+    "Qsmall", "Rsmall", "Ssmall", "Tsmall", "Usmall", "Vsmall", "Wsmall",
+    "Xsmall", "Ysmall", "Zsmall", "colonmonetary", "onefitted", "rupiah",
+    "Tildesmall", "exclamdownsmall", "centoldstyle", "Lslashsmall",
+    "Scaronsmall", "Zcaronsmall", "Dieresissmall", "Brevesmall", "Caronsmall",
+    "Dotaccentsmall", "Macronsmall", "figuredash", "hypheninferior",
+    "Ogoneksmall", "Ringsmall", "Cedillasmall", "questiondownsmall", "oneeighth",
+    "threeeighths", "fiveeighths", "seveneighths", "onethird", "twothirds",
+    "zerosuperior", "foursuperior", "fivesuperior", "sixsuperior",
+    "sevensuperior", "eightsuperior", "ninesuperior", "zeroinferior",
+    "oneinferior", "twoinferior", "threeinferior", "fourinferior",
+    "fiveinferior", "sixinferior", "seveninferior", "eightinferior",
+    "nineinferior", "centinferior", "dollarinferior", "periodinferior",
+    "commainferior", "Agravesmall", "Aacutesmall", "Acircumflexsmall",
+    "Atildesmall", "Adieresissmall", "Aringsmall", "AEsmall", "Ccedillasmall",
+    "Egravesmall", "Eacutesmall", "Ecircumflexsmall", "Edieresissmall",
+    "Igravesmall", "Iacutesmall", "Icircumflexsmall", "Idieresissmall",
+    "Ethsmall", "Ntildesmall", "Ogravesmall", "Oacutesmall", "Ocircumflexsmall",
+    "Otildesmall", "Odieresissmall", "OEsmall", "Oslashsmall", "Ugravesmall",
+    "Uacutesmall", "Ucircumflexsmall", "Udieresissmall", "Yacutesmall",
+    "Thornsmall", "Ydieresissmall", "001.000", "001.001", "001.002", "001.003",
+    "Black", "Bold", "Book", "Light", "Medium", "Regular", "Roman", "Semibold",
+}
+
+local cffreaders = {
+    readbyte,
+    readushort,
+    readuint,
+    readulong,
+}
+
+-- The header contains information about its own size.
+
+local function readheader(f)
+    local offset = getposition(f)
+    local header = {
+        offset = offset,
+        major  = readbyte(f),
+        minor  = readbyte(f),
+        size   = readbyte(f), -- headersize
+        osize  = readbyte(f), -- for offsets to start
+    }
+    setposition(f,offset+header.size)
+    return header
+end
+
+-- The indexes all look the same, so we share a loader. We could pass a handler
+-- and run over the array but why bother, we only have a few uses.
+
+local function readlengths(f)
+    local count = readushort(f)
+    if count == 0 then
+        return { }
+    end
+    local osize = readbyte(f)
+    local read  = cffreaders[osize]
+    if not read then
+        report("bad offset size: %i",osize)
+        return { }
+    end
+    local lengths  = { }
+    local previous = read(f)
+    for i=1,count do
+        local offset = read(f)
+        lengths[i] = offset - previous
+        previous = offset
+    end
+    return lengths
+end
+
+-- There can be subfonts so names is an array. However, in our case it's always
+-- one font. The same is true for the top dictionaries. Watch how we only load
+-- the dictionary string as for interpretation we need to have the strings loaded
+-- as well.
+
+local function readfontnames(f)
+    local names = readlengths(f)
+    for i=1,#names do
+        names[i] = readstring(f,names[i])
+    end
+    return names
+end
+
+local function readtopdictionaries(f)
+    local dictionaries = readlengths(f)
+    for i=1,#dictionaries do
+        dictionaries[i] = readstring(f,dictionaries[i])
+    end
+    return dictionaries
+end
+
+-- Strings are added to a list of standard strings so we start the font specific
+-- one with an offset. Strings are shared so we have one table.
+
+local function readstrings(f)
+    local lengths = readlengths(f)
+    local strings = setmetatableindex({ }, defaultstrings)
+    local index   = #defaultstrings
+    for i=1,#lengths do
+        index = index + 1
+        strings[index] = readstring(f,lengths[i])
+    end
+    return strings
+end
+
+-- Parsing the dictionaries is delayed till we have the strings loaded. The parser
+-- is stack based so the operands come before the operator (like in postscript).
+
+-- local function delta(t)
+--     local n = #t
+--     if n > 1 then
+--         local p = t[1]
+--         for i=2,n do
+--             local c = t[i]
+--             t[i] = c + p
+--             p = c
+--         end
+--     end
+-- end
+
+do
+
+    -- We use a closure so that we don't need to pass too much around.
+
+    local stack   = { }
+    local top     = 0
+    local result  = { }
+    local strings = { }
+
+    local p_single =
+        P("\00") / function()
+            result.version = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\01") / function()
+            result.notice = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\02") / function()
+            result.fullname = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\03") / function()
+            result.familyname = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\04") / function()
+            result.weight = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\05") / function()
+            result.fontbbox = { unpack(stack,1,4) }
+            top = 0
+        end
+   -- + P("\06") / function() end -- bluevalues
+   -- + P("\07") / function() end -- otherblues
+   -- + P("\08") / function() end -- familyblues
+   -- + P("\09") / function() end -- familyotherblues
+   -- + P("\10") / function() end -- strhw
+   -- + P("\11") / function() end -- stdvw
+      + P("\13") / function()
+            result.uniqueid = stack[top]
+            top = 0
+        end
+      + P("\14") / function()
+            result.xuid = concat(stack,"",1,top)
+            top = 0
+        end
+      + P("\15") / function()
+            result.charset = stack[top]
+            top = 0
+        end
+      + P("\16") / function()
+            result.encoding = stack[top]
+            top = 0
+        end
+      + P("\17") / function()
+            result.charstrings = stack[top]
+            top = 0
+        end
+      + P("\18") / function()
+            result.private = {
+                size   = stack[top-1],
+                offset = stack[top],
+            }
+            top = 0
+        end
+      + P("\19") / function()
+            result.subroutines = stack[top]
+        end
+      + P("\20") / function()
+            result.defaultwidthx = stack[top]
+        end
+      + P("\21") / function()
+            result.nominalwidthx = stack[top]
+        end
+   -- + P("\22") / function() end -- reserved
+   -- + P("\23") / function() end -- reserved
+   -- + P("\24") / function() end -- reserved
+   -- + P("\25") / function() end -- reserved
+   -- + P("\26") / function() end -- reserved
+   -- + P("\27") / function() end -- reserved
+
+    local p_double = P("\12") * (
+        P("\00") / function()
+            result.copyright = stack[top]
+            top = 0
+        end
+      + P("\01") / function()
+            result.monospaced = stack[top] == 1 and true or false -- isfixedpitch
+            top = 0
+        end
+      + P("\02") / function()
+            result.italicangle = stack[top]
+            top = 0
+        end
+      + P("\03") / function()
+            result.underlineposition = stack[top]
+            top = 0
+        end
+      + P("\04") / function()
+            result.underlinethickness = stack[top]
+            top = 0
+        end
+      + P("\05") / function()
+            result.painttype = stack[top]
+            top = 0
+        end
+      + P("\06") / function()
+            result.charstringtype = stack[top]
+            top = 0
+        end
+      + P("\07") / function()
+            result.fontmatrix = { unpack(stack,1,6) }
+            top = 0
+        end
+      + P("\08") / function()
+            result.strokewidth = stack[top]
+            top = 0
+        end
+      + P("\20") / function()
+            result.syntheticbase = stack[top]
+            top = 0
+        end
+      + P("\21") / function()
+            result.postscript = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\22") / function()
+            result.basefontname = strings[stack[top]] or "unset"
+            top = 0
+        end
+      + P("\21") / function()
+            result.basefontblend = stack[top]
+            top = 0
+        end
+      + P("\30") / function()
+            result.cid.registry   = strings[stack[top-2]] or "unset"
+            result.cid.ordering   = strings[stack[top-1]] or "unset"
+            result.cid.supplement = stack[top]
+            top = 0
+        end
+      + P("\31") / function()
+            result.cid.fontversion = stack[top]
+            top = 0
+        end
+      + P("\32") / function()
+            result.cid.fontrevision= stack[top]
+            top = 0
+        end
+      + P("\33") / function()
+            result.cid.fonttype = stack[top]
+            top = 0
+        end
+      + P("\34") / function()
+            result.cid.count = stack[top]
+            top = 0
+        end
+      + P("\35") / function()
+            result.cid.uidbase = stack[top]
+            top = 0
+        end
+      + P("\36") / function()
+            result.cid.fdarray = stack[top]
+            top = 0
+        end
+      + P("\37") / function()
+            result.cid.fdselect = stack[top]
+            top = 0
+        end
+      + P("\38") / function()
+            result.cid.fontname = strings[stack[top]] or "unset"
+            top = 0
+        end
+    )
+
+    -- Some lpeg fun ... a first variant split the byte and made a new string but
+    -- the second variant is much faster. Not that it matters much as we don't see
+    -- such numbers often.
+
+    local p_last = P("\x0F") / "0" + P("\x1F") / "1" + P("\x2F") / "2"  + P("\x3F") / "3"
+        + P("\x4F") / "4" + P("\x5F") / "5" + P("\x6F") / "6"  + P("\x7F") / "7"
+        + P("\x8F") / "8" + P("\x9F") / "9" + P("\xAF") / ""   + P("\xBF") / ""
+        + P("\xCF") / ""  + P("\xDF") / ""  + P("\xEF") / ""   + R("\xF0\xFF") / ""
+
+ -- local remap = { [0] =
+ --     "00",  "01",  "02",  "03",  "04",  "05",  "06",  "07",  "08",  "09",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "10",  "11",  "12",  "13",  "14",  "15",  "16",  "17",  "18",  "19",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "20",  "21",  "22",  "23",  "24",  "25",  "26",  "27",  "28",  "29",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "30",  "31",  "32",  "33",  "34",  "35",  "36",  "37",  "38",  "39",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "40",  "41",  "42",  "43",  "44",  "45",  "46",  "47",  "48",  "49",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "50",  "51",  "52",  "53",  "54",  "55",  "56",  "57",  "58",  "59",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "60",  "61",  "62",  "63",  "64",  "65",  "66",  "67",  "68",  "69",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "70",  "71",  "72",  "73",  "74",  "75",  "76",  "77",  "78",  "79",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "80",  "81",  "82",  "83",  "84",  "85",  "86",  "87",  "88",  "89",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     "90",  "91",  "92",  "93",  "94",  "95",  "96",  "97",  "98",  "99",  "0.",  "0E",  "0E-",  "0",  "0-",  "0",
+ --     ".0",  ".1",  ".2",  ".3",  ".4",  ".5",  ".6",  ".7",  ".8",  ".9",  "..",  ".E",  ".E-",  ".",  ".-",  ".",
+ --     "E0",  "E1",  "E2",  "E3",  "E4",  "E5",  "E6",  "E7",  "E8",  "E9",  "E.",  "EE",  "EE-",  "E",  "E-",  "E",
+ --     "E-0", "E-1", "E-2", "E-3", "E-4", "E-5", "E-6", "E-7", "E-8", "E-9", "E-.", "E-E", "E-E-", "E-", "E--", "E-",
+ --     "-0",  "-1",  "-2",  "-3",  "-4",  "-5",  "-6",  "-7",  "-8",  "-9",  "-.",  "-E",  "-E-",  "-",  "--",  "-",
+ -- }
+
+ -- local p_nibbles = Cs(((1-p_last)/byte/remap)^0+p_last)
+
+ -- local p = P("\30") * p_nibbles / function(t)
+ --     print(tonumber(t))
+ -- end
+
+    local remap = {
+        ["\x00"] = "00",  ["\x01"] = "01",  ["\x02"] = "02",  ["\x03"] = "03",  ["\x04"] = "04",  ["\x05"] = "05",  ["\x06"] = "06",  ["\x07"] = "07",  ["\x08"] = "08",  ["\x09"] = "09",  ["\x0A"] = "0.",  ["\x0B"] = "0E",  ["\x0C"] = "0E-",  ["\x0D"] = "0",  ["\x0E"] = "0-",  ["\x0F"] = "0",
+        ["\x10"] = "10",  ["\x11"] = "11",  ["\x12"] = "12",  ["\x13"] = "13",  ["\x14"] = "14",  ["\x15"] = "15",  ["\x16"] = "16",  ["\x17"] = "17",  ["\x18"] = "18",  ["\x19"] = "19",  ["\x1A"] = "0.",  ["\x1B"] = "0E",  ["\x1C"] = "0E-",  ["\x1D"] = "0",  ["\x1E"] = "0-",  ["\x1F"] = "0",
+        ["\x20"] = "20",  ["\x21"] = "21",  ["\x22"] = "22",  ["\x23"] = "23",  ["\x24"] = "24",  ["\x25"] = "25",  ["\x26"] = "26",  ["\x27"] = "27",  ["\x28"] = "28",  ["\x29"] = "29",  ["\x2A"] = "0.",  ["\x2B"] = "0E",  ["\x2C"] = "0E-",  ["\x2D"] = "0",  ["\x2E"] = "0-",  ["\x2F"] = "0",
+        ["\x30"] = "30",  ["\x31"] = "31",  ["\x32"] = "32",  ["\x33"] = "33",  ["\x34"] = "34",  ["\x35"] = "35",  ["\x36"] = "36",  ["\x37"] = "37",  ["\x38"] = "38",  ["\x39"] = "39",  ["\x3A"] = "0.",  ["\x3B"] = "0E",  ["\x3C"] = "0E-",  ["\x3D"] = "0",  ["\x3E"] = "0-",  ["\x3F"] = "0",
+        ["\x40"] = "40",  ["\x41"] = "41",  ["\x42"] = "42",  ["\x43"] = "43",  ["\x44"] = "44",  ["\x45"] = "45",  ["\x46"] = "46",  ["\x47"] = "47",  ["\x48"] = "48",  ["\x49"] = "49",  ["\x4A"] = "0.",  ["\x4B"] = "0E",  ["\x4C"] = "0E-",  ["\x4D"] = "0",  ["\x4E"] = "0-",  ["\x4F"] = "0",
+        ["\x50"] = "50",  ["\x51"] = "51",  ["\x52"] = "52",  ["\x53"] = "53",  ["\x54"] = "54",  ["\x55"] = "55",  ["\x56"] = "56",  ["\x57"] = "57",  ["\x58"] = "58",  ["\x59"] = "59",  ["\x5A"] = "0.",  ["\x5B"] = "0E",  ["\x5C"] = "0E-",  ["\x5D"] = "0",  ["\x5E"] = "0-",  ["\x5F"] = "0",
+        ["\x60"] = "60",  ["\x61"] = "61",  ["\x62"] = "62",  ["\x63"] = "63",  ["\x64"] = "64",  ["\x65"] = "65",  ["\x66"] = "66",  ["\x67"] = "67",  ["\x68"] = "68",  ["\x69"] = "69",  ["\x6A"] = "0.",  ["\x6B"] = "0E",  ["\x6C"] = "0E-",  ["\x6D"] = "0",  ["\x6E"] = "0-",  ["\x6F"] = "0",
+        ["\x70"] = "70",  ["\x71"] = "71",  ["\x72"] = "72",  ["\x73"] = "73",  ["\x74"] = "74",  ["\x75"] = "75",  ["\x76"] = "76",  ["\x77"] = "77",  ["\x78"] = "78",  ["\x79"] = "79",  ["\x7A"] = "0.",  ["\x7B"] = "0E",  ["\x7C"] = "0E-",  ["\x7D"] = "0",  ["\x7E"] = "0-",  ["\x7F"] = "0",
+        ["\x80"] = "80",  ["\x81"] = "81",  ["\x82"] = "82",  ["\x83"] = "83",  ["\x84"] = "84",  ["\x85"] = "85",  ["\x86"] = "86",  ["\x87"] = "87",  ["\x88"] = "88",  ["\x89"] = "89",  ["\x8A"] = "0.",  ["\x8B"] = "0E",  ["\x8C"] = "0E-",  ["\x8D"] = "0",  ["\x8E"] = "0-",  ["\x8F"] = "0",
+        ["\x90"] = "90",  ["\x91"] = "91",  ["\x92"] = "92",  ["\x93"] = "93",  ["\x94"] = "94",  ["\x95"] = "95",  ["\x96"] = "96",  ["\x97"] = "97",  ["\x98"] = "98",  ["\x99"] = "99",  ["\x9A"] = "0.",  ["\x9B"] = "0E",  ["\x9C"] = "0E-",  ["\x9D"] = "0",  ["\x9E"] = "0-",  ["\x9F"] = "0",
+        ["\xA0"] = ".0",  ["\xA1"] = ".1",  ["\xA2"] = ".2",  ["\xA3"] = ".3",  ["\xA4"] = ".4",  ["\xA5"] = ".5",  ["\xA6"] = ".6",  ["\xA7"] = ".7",  ["\xA8"] = ".8",  ["\xA9"] = ".9",  ["\xAA"] = "..",  ["\xAB"] = ".E",  ["\xAC"] = ".E-",  ["\xAD"] = ".",  ["\xAE"] = ".-",  ["\xAF"] = ".",
+        ["\xB0"] = "E0",  ["\xB1"] = "E1",  ["\xB2"] = "E2",  ["\xB3"] = "E3",  ["\xB4"] = "E4",  ["\xB5"] = "E5",  ["\xB6"] = "E6",  ["\xB7"] = "E7",  ["\xB8"] = "E8",  ["\xB9"] = "E9",  ["\xBA"] = "E.",  ["\xBB"] = "EE",  ["\xBC"] = "EE-",  ["\xBD"] = "E",  ["\xBE"] = "E-",  ["\xBF"] = "E",
+        ["\xC0"] = "E-0", ["\xC1"] = "E-1", ["\xC2"] = "E-2", ["\xC3"] = "E-3", ["\xC4"] = "E-4", ["\xC5"] = "E-5", ["\xC6"] = "E-6", ["\xC7"] = "E-7", ["\xC8"] = "E-8", ["\xC9"] = "E-9", ["\xCA"] = "E-.", ["\xCB"] = "E-E", ["\xCC"] = "E-E-", ["\xCD"] = "E-", ["\xCE"] = "E--", ["\xCF"] = "E-",
+        ["\xD0"] = "-0",  ["\xD1"] = "-1",  ["\xD2"] = "-2",  ["\xD3"] = "-3",  ["\xD4"] = "-4",  ["\xD5"] = "-5",  ["\xD6"] = "-6",  ["\xD7"] = "-7",  ["\xD8"] = "-8",  ["\xD9"] = "-9",  ["\xDA"] = "-.",  ["\xDB"] = "-E",  ["\xDC"] = "-E-",  ["\xDD"] = "-",  ["\xDE"] = "--",  ["\xDF"] = "-",
+    }
+
+    local p_nibbles = P("\30") * Cs(((1-p_last)/remap)^0+p_last) / function(n)
+        -- 0-9=digit a=. b=E c=E- d=reserved e=- f=finish
+        top = top + 1
+        stack[top] = tonumber(n) or 0
+    end
+
+    local p_byte = C(R("\32\246")) / function(b0)
+        -- -107 .. +107
+        top = top + 1
+        stack[top] = byte(b0) - 139
+    end
+
+    local p_positive =  C(R("\247\250")) * C(1) / function(b0,b1)
+        -- +108 .. +1131
+        top = top + 1
+        stack[top] = (byte(b0)-247)*256 + byte(b1) + 108
+    end
+
+    local p_negative = C(R("\251\254")) * C(1) / function(b0,b1)
+        -- -1131 .. -108
+        top = top + 1
+        stack[top] = -(byte(b0)-251)*256 - byte(b1) - 108
+    end
+
+    local p_short = P("\28") * C(1) * C(1) / function(b1,b2)
+        -- -32768 .. +32767 : b1<<8 | b2
+        top = top + 1
+        local n = 0x100 * byte(b1) + byte(b2)
+        if n  >= 0x8000 then
+            stack[top] = n - 0xFFFF - 1
+        else
+            stack[top] =  n
+        end
+    end
+
+    local p_long = P("\29") * C(1) * C(1) * C(1) * C(1) / function(b1,b2,b3,b4)
+        -- -2^31 .. +2^31-1 : b1<<24 | b2<<16 | b3<<8 | b4
+        top = top + 1
+        local n = 0x1000000 * byte(b1) + 0x10000 * byte(b2) + 0x100 * byte(b3) + byte(b4)
+        if n >= 0x8000000 then
+            stack[top] = n - 0xFFFFFFFF - 1
+        else
+            stack[top] = n
+        end
+    end
+
+    local p_unsupported = P(1) / function(detail)
+        top = 0
+    end
+
+    local p_dictionary = (
+        p_byte
+      + p_positive
+      + p_negative
+      + p_short
+      + p_long
+      + p_nibbles
+      + p_single
+      + p_double
+      + p_unsupported
+    )^1
+
+    parsedictionaries = function(data,dictionaries)
+        stack   = { }
+        strings = data.strings
+        for i=1,#dictionaries do
+            top    = 0
+            result = {
+                monospaced         = false,
+                italicangle        = 0,
+                underlineposition  = -100,
+                underlinethickness = 50,
+                painttype          = 0,
+                charstringtype     = 2,
+                fontmatrix         = { 0.001, 0, 0, 0.001, 0, 0 },
+                fontbbox           = { 0, 0, 0, 0 },
+                strokewidth        = 0,
+                charset            = 0,
+                encoding           = 0,
+                cid = {
+                    fontversion     = 0,
+                    fontrevision    = 0,
+                    fonttype        = 0,
+                    count           = 8720,
+                }
+            }
+            lpegmatch(p_dictionary,dictionaries[i])
+            dictionaries[i] = result
+        end
+        --
+        result = { }
+        top    = 0
+        stack  = { }
+    end
+
+    parseprivates = function(data,dictionaries)
+        stack   = { }
+        strings = data.strings
+        for i=1,#dictionaries do
+            local private = dictionaries[i].private
+            if private and private.data then
+                top     = 0
+                result  = {
+                    forcebold         = false,
+                    languagegroup     = 0,
+                    expansionfactor   = 0.06,
+                    initialrandomseed = 0,
+                    subroutines       = 0,
+                    defaultwidthx     = 0,
+                    nominalwidthx     = 0,
+                    cid               = {
+                        -- actually an error
+                    },
+                }
+                lpegmatch(p_dictionary,private.data)
+                private.data = result
+            end
+        end
+        result = { }
+        top    = 0
+        stack  = { }
+    end
+
+    -- All bezier curves have 6 points with successive pairs relative to
+    -- the previous pair. Some can be left out and are then copied or zero
+    -- (optimization).
+    --
+    -- We are not really interested in all the details of a glyph because we
+    -- only need to calculate the boundingbox. So, todo: a quick no result but
+    -- calculate only variant.
+    --
+    -- The conversion is straightforward and the specification os clear once
+    -- you understand that the x and y needs to be updates each step. It's also
+    -- quite easy to test because in mp a shape will look bad when a few variables
+    -- are swapped. But still there might be bugs down here because not all
+    -- variants are seen in a font so far. We are less compact that the ff code
+    -- because there quite some variants are done in one helper with a lot of
+    -- testing for states.
+
+    local x          = 0
+    local y          = 0
+    local width      = false
+    local r          = 0
+    local stems      = 0
+    local globalbias = 0
+    local localbias  = 0
+    local globals    = false
+    local locals     = false
+    local depth      = 1
+    local xmin       = 0
+    local xmax       = 0
+    local ymin       = 0
+    local ymax       = 0
+    local checked    = false
+    local keepcurve  = false
+
+    local function showstate(where)
+        report("%w%-10s : [%s] n=%i",depth*2,where,concat(stack," ",1,top),top)
+    end
+
+    local function showvalue(where,value,showstack)
+        if showstack then
+            report("%w%-10s : %s : [%s] n=%i",depth*2,where,tostring(value),concat(stack," ",1,top),top)
+        else
+            report("%w%-10s : %s",depth*2,where,tostring(value))
+        end
+    end
+
+    -- All these indirect calls make this run slower but it's cleaner this way
+    -- and we cache the result. As we moved the boundingbox code inline we gain
+    -- some back.
+
+    local function moveto(x,y)
+        if keepcurve then
+            r = r + 1
+            result[r] = { x, y, "m" }
+        end
+        if checked then
+            if x < xmin then xmin = x elseif x > xmax then xmax = x end
+            if y < ymin then ymin = y elseif y > ymax then ymax = y end
+        else
+            xmin = x
+            ymin = y
+            xmax = x
+            ymax = y
+            checked = true
+        end
+    end
+
+    local function lineto(x,y)
+        if keepcurve then
+            r = r + 1
+            result[r] = { x, y, "l" }
+        end
+        if checked then
+            if x < xmin then xmin = x elseif x > xmax then xmax = x end
+            if y < ymin then ymin = y elseif y > ymax then ymax = y end
+        else
+            xmin = x
+            ymin = y
+            xmax = x
+            ymax = y
+            checked = true
+        end
+    end
+
+    local function curveto(x1,y1,x2,y2,x3,y3)
+        if keepcurve then
+            r = r + 1
+            result[r] = { x1, y1, x2, y2, x3, y3, "c" }
+        end
+        if checked then
+            if x1 < xmin then xmin = x1 elseif x1 > xmax then xmax = x1 end
+            if y1 < ymin then ymin = y1 elseif y1 > ymax then ymax = y1 end
+        else
+            xmin = x1
+            ymin = y1
+            xmax = x1
+            ymax = y1
+            checked = true
+        end
+        if x2 < xmin then xmin = x2 elseif x2 > xmax then xmax = x2 end
+        if y2 < ymin then ymin = y2 elseif y2 > ymax then ymax = y2 end
+        if x3 < xmin then xmin = x3 elseif x3 > xmax then xmax = x3 end
+        if y3 < ymin then ymin = y3 elseif y3 > ymax then ymax = y3 end
+    end
+
+    local function rmoveto()
+        if top > 2 then
+            if not width then
+                width = stack[1]
+                if trace_charstrings then
+                    showvalue("width",width)
+                end
+            end
+        elseif not width then
+            width = true
+        end
+        if trace_charstrings then
+            showstate("rmoveto")
+        end
+        x = x + stack[top-1] -- dx1
+        y = y + stack[top]   -- dy1
+        top = 0
+        moveto(x,y)
+    end
+
+    local function hmoveto()
+        if top > 1 then
+            if not width then
+                width = stack[1]
+                if trace_charstrings then
+                    showvalue("width",width)
+                end
+            end
+        elseif not width then
+            width = true
+        end
+        if trace_charstrings then
+            showstate("hmoveto")
+        end
+        x = x + stack[top] -- dx1
+        top = 0
+        moveto(x,y)
+    end
+
+    local function vmoveto()
+        if top > 1 then
+            if not width then
+                width = stack[1]
+                if trace_charstrings then
+                    showvalue("width",width)
+                end
+            end
+        elseif not width then
+            width = true
+        end
+        if trace_charstrings then
+            showstate("vmoveto")
+        end
+        y = y + stack[top] -- dy1
+        top = 0
+        moveto(x,y)
+    end
+
+    local function rlineto()
+        if trace_charstrings then
+            showstate("rlineto")
+        end
+        for i=1,top,2 do
+            x = x + stack[i]   -- dxa
+            y = y + stack[i+1] -- dya
+            lineto(x,y)
+        end
+        top = 0
+    end
+
+    local function xlineto(swap) -- x (y,x)+ | (x,y)+
+        for i=1,top do
+            if swap then
+                x = x + stack[i]
+                swap = false
+            else
+                y = y + stack[i]
+                swap = true
+            end
+            lineto(x,y)
+        end
+        top = 0
+    end
+
+    local function hlineto() -- x (y,x)+ | (x,y)+
+        if trace_charstrings then
+            showstate("hlineto")
+        end
+        xlineto(true)
+    end
+
+    local function vlineto() -- y (x,y)+ | (y,x)+
+        if trace_charstrings then
+            showstate("vlineto")
+        end
+        xlineto(false)
+    end
+
+    local function rrcurveto()
+        if trace_charstrings then
+            showstate("rrcurveto")
+        end
+        for i=1,top,6 do
+            local ax = x  + stack[i]   -- dxa
+            local ay = y  + stack[i+1] -- dya
+            local bx = ax + stack[i+2] -- dxb
+            local by = ay + stack[i+3] -- dyb
+            x = bx + stack[i+4] -- dxc
+            y = by + stack[i+5] -- dyc
+            curveto(ax,ay,bx,by,x,y)
+        end
+        top = 0
+    end
+
+    local function hhcurveto()
+        if trace_charstrings then
+            showstate("hhcurveto")
+        end
+        local s = 1
+        if top % 2 ~= 0 then
+            y = y + stack[1] -- dy1
+            s = 2
+        end
+        for i=s,top,4 do
+            local ax = x + stack[i] -- dxa
+            local ay = y
+            local bx = ax + stack[i+1] -- dxb
+            local by = ay + stack[i+2] -- dyb
+            x = bx + stack[i+3] -- dxc
+            y = by
+            curveto(ax,ay,bx,by,x,y)
+        end
+        top = 0
+    end
+
+    local function vvcurveto()
+        if trace_charstrings then
+            showstate("vvcurveto")
+        end
+        local s = 1
+        local d = 0
+        if top % 2 ~= 0 then
+            d = stack[1] -- dx1
+            s = 2
+        end
+        for i=s,top,4 do
+            local ax = x + d
+            local ay = y + stack[i] -- dya
+            local bx = ax + stack[i+1] -- dxb
+            local by = ay + stack[i+2] -- dyb
+            x = bx
+            y = by + stack[i+3] -- dyc
+            curveto(ax,ay,bx,by,x,y)
+            d = 0
+        end
+        top = 0
+    end
+
+    local function xxcurveto(swap)
+        local last = top % 4 ~= 0 and stack[top]
+        if last then
+            top = top - 1
+        end
+        local sw = swap
+        for i=1,top,4 do
+            local ax, ay, bx, by
+            if swap then
+                ax = x  + stack[i]
+                ay = y
+                bx = ax + stack[i+1]
+                by = ay + stack[i+2]
+                y  = by + stack[i+3]
+                if last and i+3 == top then
+                    x = bx + last
+                else
+                    x = bx
+                end
+                swap = false
+            else
+                ax = x
+                ay = y  + stack[i]
+                bx = ax + stack[i+1]
+                by = ay + stack[i+2]
+                x  = bx + stack[i+3]
+                if last and i+3 == top then
+                    y = by + last
+                else
+                    y = by
+                end
+                swap = true
+            end
+            curveto(ax,ay,bx,by,x,y)
+        end
+        top = 0
+    end
+
+    local function hvcurveto()
+        if trace_charstrings then
+            showstate("hvcurveto")
+        end
+        xxcurveto(true)
+    end
+
+    local function vhcurveto()
+        if trace_charstrings then
+            showstate("vhcurveto")
+        end
+        xxcurveto(false)
+    end
+
+    local function rcurveline()
+        if trace_charstrings then
+            showstate("rcurveline")
+        end
+        for i=1,top-2,6 do
+            local ax = x  + stack[i]   -- dxa
+            local ay = y  + stack[i+1] -- dya
+            local bx = ax + stack[i+2] -- dxb
+            local by = ay + stack[i+3] -- dyb
+            x = bx + stack[i+4] -- dxc
+            y = by + stack[i+5] -- dyc
+            curveto(ax,ay,bx,by,x,y)
+        end
+        x = x + stack[top-1] -- dxc
+        y = y + stack[top]   -- dyc
+        lineto(x,y)
+        top = 0
+    end
+
+    local function rlinecurve()
+        if trace_charstrings then
+            showstate("rlinecurve")
+        end
+        if top > 6 then
+            for i=1,top-6,2 do
+                x = x + stack[i]
+                y = y + stack[i+1]
+                lineto(x,y)
+            end
+        end
+        local ax = x  + stack[top-5]
+        local ay = y  + stack[top-4]
+        local bx = ax + stack[top-3]
+        local by = ay + stack[top-2]
+        x = bx + stack[top-1]
+        y = by + stack[top]
+        curveto(ax,ay,bx,by,x,y)
+        top = 0
+    end
+
+    -- flex is not yet tested! no loop
+
+    local function flex() -- fd not used
+        if trace_charstrings then
+            showstate("flex")
+        end
+        local ax = x  + stack[1]  -- dx1
+        local ay = y  + stack[2]  -- dy1
+        local bx = ax + stack[3]  -- dx2
+        local by = ay + stack[4]  -- dy2
+        local cx = bx + stack[5]  -- dx3
+        local cy = by + stack[6]  -- dy3
+        curveto(ax,ay,bx,by,cx,cy)
+        local dx = cx + stack[7]  -- dx4
+        local dy = cy + stack[8]  -- dy4
+        local ex = dx + stack[9]  -- dx5
+        local ey = dy + stack[10] -- dy5
+        x = ex + stack[11]        -- dx6
+        y = ey + stack[12]        -- dy6
+        curveto(dx,dy,ex,ey,x,y)
+        top = 0
+    end
+
+    local function hflex()
+        if trace_charstrings then
+            showstate("hflex")
+        end
+        local ax = x  + stack[1]   -- dx1
+        local ay = y
+        local bx = ax + stack[2] -- dx2
+        local by = ay + stack[3] -- dy2
+        local cx = bx + stack[4] -- dx3
+        local cy = by
+        curveto(ax,ay,bx,by,cx,cy)
+        local dx = cx + stack[5] -- dx4
+        local dy = by
+        local ex = dx + stack[6] -- dx5
+        local ey = y
+        x  = ex + stack[7]       -- dx6
+        curveto(dx,dy,ex,ey,x,y)
+        top = 0
+    end
+
+    local function hflex1()
+        if trace_charstrings then
+            showstate("hflex1")
+        end
+        local ax = x  + stack[1] -- dx1
+        local ay = y  + stack[2] -- dy1
+        local bx = ax + stack[3] -- dx2
+        local by = ay + stack[4] -- dy2
+        local cx = bx + stack[5] -- dx3
+        local cy = by
+        curveto(ax,ay,bx,by,cx,cy)
+        local dx = cx + stack[6] -- dx4
+        local dy = by
+        local ex = dx + stack[7] -- dx5
+        local ey = dy + stack[8] -- dy5
+        x  = ex + stack[9]       -- dx6
+        curveto(dx,dy,ex,ey,x,y)
+        top = 0
+    end
+
+    local function flex1()
+        if trace_charstrings then
+            showstate("flex1")
+        end
+        local ax = x  + stack[1]  --dx1
+        local ay = y  + stack[2]  --dy1
+        local bx = ax + stack[3]  --dx2
+        local by = ay + stack[4]  --dy2
+        local cx = bx + stack[5]  --dx3
+        local cy = by + stack[6]  --dy3
+        curveto(ax,ay,bx,by,cx,cy)
+        local dx = cx + stack[7]  --dx4
+        local dy = cy + stack[8]  --dy4
+        local ex = dx + stack[9]  --dx5
+        local ey = dy + stack[10] --dy5
+        if abs(ex - x) > abs(ey - y) then -- spec: abs(dx) > abs(dy)
+            x = ex + stack[11]
+        else
+            y = ey + stack[11]
+        end
+        curveto(dx,dy,ex,ey,x,y)
+        top = 0
+    end
+
+    local function getstem()
+        if top == 0 then
+            -- bad
+        elseif top % 2 ~= 0 then
+            if width then
+                remove(stack,1)
+            else
+                width = remove(stack,1)
+                if trace_charstrings then
+                    showvalue("width",width)
+                end
+            end
+            top = top - 1
+        end
+        if trace_charstrings then
+            showstate("stem")
+        end
+        stems = stems + top/2
+        top   = 0
+    end
+
+    local function getmask()
+        if top == 0 then
+            -- bad
+        elseif top % 2 ~= 0 then
+            if width then
+                remove(stack,1)
+            else
+                width = remove(stack,1)
+                if trace_charstrings then
+                    showvalue("width",width)
+                end
+            end
+            top = top - 1
+        end
+        if trace_charstrings then
+            showstate(operator == 19 and "hintmark" or "cntrmask")
+        end
+        stems = stems + top/2
+        top   = 0
+        if stems == 0 then
+            -- forget about it
+        elseif stems <= 8 then
+            return 1
+        else
+            return floor((stems+7)/8)
+        end
+    end
+
+    local function unsupported()
+        if trace_charstrings then
+            showstate("unsupported")
+        end
+        top = 0
+    end
+
+    -- Bah, we cannot use a fast lpeg because a hint has an unknown size and a
+    -- runtime capture cannot handle that well.
+
+    local actions = { [0] =
+        unsupported,  --  0
+        getstem,      --  1 -- hstem
+        unsupported,  --  2
+        getstem,      --  3 -- vstem
+        vmoveto,      --  4
+        rlineto,      --  5
+        hlineto,      --  6
+        vlineto,      --  7
+        rrcurveto,    --  8
+        unsupported,  --  9 -- closepath
+        unsupported,  -- 10 -- calllocal,
+        unsupported,  -- 11 -- callreturn,
+        unsupported,  -- 12 -- elsewhere
+        unsupported,  -- 13 -- hsbw
+        unsupported,  -- 14 -- endchar,
+        unsupported,  -- 15
+        unsupported,  -- 16
+        unsupported,  -- 17
+        getstem,      -- 18 -- hstemhm
+        getmask,      -- 19 -- hintmask
+        getmask,      -- 20 -- cntrmask
+        rmoveto,      -- 21
+        hmoveto,      -- 22
+        getstem,      -- 23 -- vstemhm
+        rcurveline,   -- 24
+        rlinecurve,   -- 25
+        vvcurveto,    -- 26
+        hhcurveto,    -- 27
+        unsupported,  -- 28 -- elsewhere
+        unsupported,  -- 29 -- elsewhere
+        vhcurveto,    -- 30
+        hvcurveto,    -- 31
+    }
+
+    local subactions = {
+        [034] = hflex,
+        [035] = flex,
+        [036] = hflex1,
+        [037] = flex1,
+    }
+
+    local p_bytes = Ct((P(1)/byte)^0)
+
+    local function call(scope,list,bias,process)
+        local index = stack[top] + bias
+        top = top - 1
+        if trace_charstrings then
+            showvalue(scope,index,true)
+        end
+        local str = list[index]
+        if str then
+            if type(str) == "string" then
+                str = lpegmatch(p_bytes,str)
+                list[index] = str
+            end
+            depth = depth + 1
+            process(str)
+            depth = depth - 1
+        else
+            report("unknown %s %i",scope,index)
+        end
+    end
+
+    local function process(tab)
+        local i = 1
+        local n = #tab
+        while i <= n do
+            local t = tab[i]
+            if t >= 32 and t<=246 then
+                -- -107 .. +107
+                top = top + 1
+                stack[top] = t - 139
+                i = i + 1
+            elseif t >= 247 and t <= 250 then
+                -- +108 .. +1131
+                top = top + 1
+                stack[top] = (t-247)*256 + tab[i+1] + 108
+                i = i + 2
+            elseif t >= 251 and t <= 254 then
+                -- -1131 .. -108
+                top = top + 1
+                stack[top] = -(t-251)*256 - tab[i+1] - 108
+                i = i + 2
+            elseif t == 28 then
+                -- -32768 .. +32767 : b1<<8 | b2
+                top = top + 1
+                local n = 0x100 * tab[i+1] + tab[i+2]
+                if n  >= 0x8000 then
+                    stack[top] = n - 0xFFFF - 1
+                else
+                    stack[top] = n
+                end
+                i = i + 3
+            elseif t == 255 then
+                local n = 0x100 * tab[i+1] + tab[i+2]
+                top = top + 1
+                if n  >= 0x8000 then
+                    stack[top] = n - 0xFFFF - 1 + (0x100 * tab[i+3] + tab[i+4])/0xFFFF
+                else
+                    stack[top] = n              + (0x100 * tab[i+3] + tab[i+4])/0xFFFF
+                end
+                i = i + 5
+           elseif t == 11 then
+                if trace_charstrings then
+                    showstate("return")
+                end
+                return
+            elseif t == 10 then
+                call("local",locals,localbias,process)
+                i = i + 1
+             elseif t == 14 then -- endchar
+                if width then
+                    -- okay
+                elseif top > 0 then
+                    width = stack[1]
+                    if trace_charstrings then
+                        showvalue("width",width)
+                    end
+                else
+                    width = true
+                end
+                if trace_charstrings then
+                    showstate("endchar")
+                end
+                return
+            elseif t == 29 then
+                call("global",globals,globalbias,process)
+                i = i + 1
+            elseif t == 12 then
+                i = i + 1
+                local t = tab[i]
+                local a = subactions[t]
+                if a then
+                    a()
+                else
+                    if trace_charstrings then
+                        showvalue("<subaction>",t)
+                    end
+                    top = 0
+                end
+                i = i + 1
+            else
+                local a = actions[t]
+                if a then
+                    local s = a()
+                    if s then
+                        i = i + s
+                    end
+                else
+                    if trace_charstrings then
+                        showvalue("<action>",t)
+                    end
+                    top = 0
+                end
+                i = i + 1
+            end
+        end
+    end
+
+ -- local function calculatebounds(segments,x,y)
+ --     local nofsegments = #segments
+ --     if nofsegments == 0 then
+ --         return { x, y, x, y }
+ --     else
+ --         local xmin =  10000
+ --         local xmax = -10000
+ --         local ymin =  10000
+ --         local ymax = -10000
+ --         if x < xmin then xmin = x end
+ --         if x > xmax then xmax = x end
+ --         if y < ymin then ymin = y end
+ --         if y > ymax then ymax = y end
+ --         -- we now have a reasonable start so we could
+ --         -- simplyfy the next checks
+ --         for i=1,nofsegments do
+ --             local s = segments[i]
+ --             local x = s[1]
+ --             local y = s[2]
+ --             if x < xmin then xmin = x end
+ --             if x > xmax then xmax = x end
+ --             if y < ymin then ymin = y end
+ --             if y > ymax then ymax = y end
+ --             if s[#s] == "c" then -- "curveto"
+ --                 local x = s[3]
+ --                 local y = s[4]
+ --                 if x < xmin then xmin = x elseif x > xmax then xmax = x end
+ --                 if y < ymin then ymin = y elseif y > ymax then ymax = y end
+ --                 local x = s[5]
+ --                 local y = s[6]
+ --                 if x < xmin then xmin = x elseif x > xmax then xmax = x end
+ --                 if y < ymin then ymin = y elseif y > ymax then ymax = y end
+ --             end
+ --         end
+ --         return { round(xmin), round(ymin), round(xmax), round(ymax) } -- doesn't make ceil more sense
+ --     end
+ -- end
+
+    parsecharstrings = function(data,glyphs,doshapes)
+        -- for all charstrings
+        local dictionary  = data.dictionaries[1]
+        local charstrings = dictionary.charstrings
+        local charset     = dictionary.charset
+        keepcurve  = doshapes
+        stack      = { }
+        glyphs     = glyphs or { }
+        strings    = data.strings
+        locals     = dictionary.subroutines
+        globals    = data.routines
+        globalbias = #globals
+        localbias  = #locals
+        globalbias = ((globalbias <  1240 and 107) or (globalbias < 33900 and 1131) or 32768) + 1
+        localbias  = ((localbias  <  1240 and 107) or (localbias  < 33900 and 1131) or 32768) + 1
+        local nominalwidth = dictionary.private.data.nominalwidthx or 0
+        local defaultwidth = dictionary.private.data.defaultwidthx or 0
+
+        for i=1,#charstrings do
+            local str   = charstrings[i]
+            local tab   = lpegmatch(p_bytes,str)
+            local index = i - 1
+            x       = 0
+            y       = 0
+            width   = false
+            r       = 0
+            top     = 0
+            stems   = 0
+            result  = { }
+            --
+            xmin    = 0
+            xmax    = 0
+            ymin    = 0
+            ymax    = 0
+            checked = false
+            --
+            if trace_charstrings then
+                report("glyph: %i",index)
+                report("data: % t",tab)
+            end
+            --
+            process(tab)
+            --
+            local boundingbox = { round(xmin), round(ymin), round(xmax), round(ymax) }
+            --
+            if width == true or width == false then
+                width = defaultwidth
+            else
+                width = nominalwidth + width
+            end
+            --
+         -- trace_charstrings = index == 3078 -- todo: make tracker
+            local glyph = glyphs[index] -- can be autodefined in otr
+            if not glyph then
+                glyphs[index] = {
+                    segments    = doshapes ~= false and result or nil, -- optional
+                    boundingbox = boundingbox,
+                    width       = width,
+                    name        = charset[index],
+                 -- sidebearing = 0,
+                }
+            else
+                glyph.segments    = doshapes ~= false and result or nil
+                glyph.boundingbox = boundingbox
+                if not glyph.width then
+                    glyph.width = width
+                end
+                if charset and not glyph.name then
+                    glyph.name = charset[index]
+                end
+             -- glyph.sidebearing = 0 -- todo
+            end
+            if trace_charstrings then
+                report("width: %s",tostring(width))
+                report("boundingbox: % t",boundingbox)
+            end
+            charstrings[i] = nil -- free memory
+        end
+        return glyphs
+    end
+
+    parsecharstring = function(data,dictionary,charstring,glyphs,index,doshapes)
+        local private = dictionary.private
+        keepcurve  = doshapes
+        strings    = data.strings -- or in dict?
+        locals     = dictionary.subroutines or { }
+        globals    = data.routines or { }
+        globalbias = #globals
+        localbias  = #locals
+        globalbias = ((globalbias <  1240 and 107) or (globalbias < 33900 and 1131) or 32768) + 1
+        localbias  = ((localbias  <  1240 and 107) or (localbias  < 33900 and 1131) or 32768) + 1
+        local nominalwidth = private and private.data.nominalwidthx or 0
+        local defaultwidth = private and private.data.defaultwidthx or 0
+        --
+        local tab = lpegmatch(p_bytes,charstring)
+        x         = 0
+        y         = 0
+        width     = false
+        r         = 0
+        top       = 0
+        stems     = 0
+        result    = { }
+        --
+        xmin      = 0
+        xmax      = 0
+        ymin      = 0
+        ymax      = 0
+        checked   = false
+        --
+        if trace_charstrings then
+            report("glyph: %i",index)
+            report("data: % t",tab)
+        end
+        --
+        process(tab)
+        --
+        local boundingbox = { xmin, ymin, xmax, ymax }
+        --
+        if width == true or width == false then
+            width = defaultwidth
+        else
+            width = nominalwidth + width
+        end
+        --
+index = index - 1
+        local glyph = glyphs[index] -- can be autodefined in otr
+        if not glyph then
+            glyphs[index] = {
+                segments    = doshapes ~= false and result or nil, -- optional
+                boundingbox = boundingbox,
+                width       = width,
+                name        = charset[index],
+             -- sidebearing = 0,
+            }
+        else
+            glyph.segments    = doshapes ~= false and result or nil
+            glyph.boundingbox = boundingbox
+            if not glyph.width then
+                glyph.width = width
+            end
+            if charset and not glyph.name then
+                glyph.name = charset[index]
+            end
+         -- glyph.sidebearing = 0 -- todo
+        end
+        --
+        if trace_charstrings then
+            report("width: %s",tostring(width))
+            report("boundingbox: % t",boundingbox)
+        end
+        --
+        return charstring
+    end
+
+    resetcharstrings = function()
+        result = { }
+        top    = 0
+        stack  = { }
+    end
+
+end
+
+local function readglobals(f,data)
+    local routines = readlengths(f)
+    for i=1,#routines do
+        routines[i] = readstring(f,routines[i])
+    end
+    data.routines = routines
+end
+
+local function readencodings(f,data)
+    data.encodings = { }
+end
+
+local function readcharsets(f,data,dictionary)
+    local header        = data.header
+    local strings       = data.strings
+    local nofglyphs     = data.nofglyphs
+    local charsetoffset = dictionary.charset
+
+    if charsetoffset ~= 0 then
+        setposition(f,header.offset+charsetoffset)
+        local format       = readbyte(f)
+        local charset      = { [0] = ".notdef" }
+        dictionary.charset = charset
+        if format == 0 then
+            for i=1,nofglyphs do
+                charset[i] = strings[readushort(f)]
+            end
+        elseif format == 1 or format == 2 then
+            local readcount = format == 1 and readbyte or readushort
+            local i = 1
+            while i <= nofglyphs do
+                local sid = readushort(f)
+                local n   = readcount(f)
+                for s=sid,sid+n do
+                    charset[i] = strings[s]
+                    i = i + 1
+                    if i > nofglyphs then
+                        break
+                    end
+                end
+            end
+        else
+            report("cff parser: unsupported charset format %a",format)
+        end
+    end
+end
+
+local function readprivates(f,data)
+    local header       = data.header
+    local dictionaries = data.dictionaries
+    local private      = dictionaries[1].private
+    if private then
+        setposition(f,header.offset+private.offset)
+        private.data = readstring(f,private.size)
+    end
+end
+
+local function readlocals(f,data,dictionary)
+    local header  = data.header
+    local private = dictionary.private
+    if private then
+        local subroutineoffset = private.data.subroutines
+        if subroutineoffset ~= 0 then
+            setposition(f,header.offset+private.offset+subroutineoffset)
+            local subroutines = readlengths(f)
+            for i=1,#subroutines do
+                subroutines[i] = readstring(f,subroutines[i])
+            end
+            dictionary.subroutines = subroutines
+            private.data.subroutines = nil
+        else
+            dictionary.subroutines = { }
+        end
+    else
+        dictionary.subroutines = { }
+    end
+end
+
+-- These charstrings are little programs and described in: Technical Note #5177. A truetype
+-- font has only one dictionary.
+
+local function readcharstrings(f,data)
+    local header       = data.header
+    local dictionaries = data.dictionaries
+    local dictionary   = dictionaries[1]
+    local type         = dictionary.charstringtype
+    local offset       = dictionary.charstrings
+    if type == 2 then
+        setposition(f,header.offset+offset)
+        -- could be a metatable .. delayed loading
+        local charstrings = readlengths(f)
+        local nofglyphs   = #charstrings
+        for i=1,nofglyphs do
+            charstrings[i] = readstring(f,charstrings[i])
+        end
+        data.nofglyphs         = nofglyphs
+        dictionary.charstrings = charstrings
+    else
+        report("unsupported charstr type %i",type)
+        data.nofglyphs         = 0
+        dictionary.charstrings = { }
+    end
+end
+
+-- cid (maybe do this stepwise so less mem) -- share with above
+
+local function readcidprivates(f,data)
+    local header       = data.header
+    local dictionaries = data.dictionaries[1].cid.dictionaries
+    for i=1,#dictionaries do
+        local dictionary = dictionaries[i]
+        local private    = dictionary.private
+        if private then
+            setposition(f,header.offset+private.offset)
+            private.data = readstring(f,private.size)
+        end
+    end
+    parseprivates(data,dictionaries)
+end
+
+local function readnoselect(f,data,glyphs,doshapes)
+    local dictionaries = data.dictionaries
+    local dictionary   = dictionaries[1]
+    readglobals(f,data)
+    readcharstrings(f,data)
+    readencodings(f,data)
+    readcharsets(f,data,dictionary)
+    readprivates(f,data)
+    parseprivates(data,data.dictionaries)
+    readlocals(f,data,dictionary)
+    parsecharstrings(data,glyphs,doshapes)
+    resetcharstrings()
+end
+
+local function readfdselect(f,data,glyphs,doshapes)
+    local header       = data.header
+    local dictionaries = data.dictionaries
+    local dictionary   = dictionaries[1]
+    local cid          = dictionary.cid
+    local cidselect    = cid and cid.fdselect
+    readglobals(f,data)
+    readcharstrings(f,data)
+    readencodings(f,data)
+    local charstrings  = dictionary.charstrings
+    local fdindex      = { }
+    local nofglyphs    = data.nofglyphs
+    local maxindex     = -1
+    setposition(f,header.offset+cidselect)
+    local format       = readbyte(f)
+    if format == 1 then
+        for i=0,nofglyphs do -- notdef included (needs checking)
+            local index = readbyte(i)
+            fdindex[i] = index
+            if index > maxindex then
+                maxindex = index
+            end
+        end
+    elseif format == 3 then
+        local nofranges = readushort(f)
+        local first     = readushort(f)
+        local index     = readbyte(f)
+        while true do
+            local last = readushort(f)
+            if index > maxindex then
+                maxindex = index
+            end
+            for i=first,last do
+                fdindex[i] = index
+            end
+            if last >= nofglyphs then
+                break
+            else
+                first = last + 1
+                index = readbyte(f)
+            end
+        end
+    else
+        -- unsupported format
+    end
+    if maxindex >= 0 then
+        local cidarray = cid.fdarray
+        setposition(f,header.offset+cidarray)
+        local dictionaries = readlengths(f)
+        for i=1,#dictionaries do
+            dictionaries[i] = readstring(f,dictionaries[i])
+        end
+        parsedictionaries(data,dictionaries)
+        cid.dictionaries = dictionaries
+        readcidprivates(f,data)
+        for i=1,#dictionaries do
+            readlocals(f,data,dictionaries[i])
+        end
+        for i=1,#charstrings do
+            parsecharstring(data,dictionaries[fdindex[i]+1],charstrings[i],glyphs,i,doshapes)
+        end
+        resetcharstrings()
+    end
+end
+
+function readers.cff(f,fontdata,specification)
+--     if specification.glyphs then
+    if specification.details then
+        local datatable = fontdata.tables.cff
+        if datatable then
+            local offset = datatable.offset
+            local glyphs = fontdata.glyphs
+            if not f then
+                report("invalid filehandle")
+                return
+            end
+            if offset then
+                setposition(f,offset)
+            end
+            local header = readheader(f)
+            if header.major > 1 then
+                report("version mismatch")
+                return
+            end
+            local names        = readfontnames(f)
+            local dictionaries = readtopdictionaries(f)
+            local strings      = readstrings(f)
+            local data = {
+                header       = header,
+                names        = names,
+                dictionaries = dictionaries,
+                strings      = strings,
+                nofglyphs    = fontdata.nofglyphs,
+            }
+            --
+            parsedictionaries(data,data.dictionaries)
+            --
+            local d = dictionaries[1]
+            local c = d.cid
+            fontdata.cffinfo = {
+                familynamename     = d.familyname,
+                fullname           = d.fullname,
+                boundingbox        = d.boundingbox,
+                weight             = d.weight,
+                italicangle        = d.italicangle,
+                underlineposition  = d.underlineposition,
+                underlinethickness = d.underlinethickness,
+                monospaced         = d.monospaced,
+            }
+            fontdata.cidinfo = c and {
+                registry   = c.registry,
+                ordering   = c.ordering,
+                supplement = c.supplement,
+            }
+            --
+            if not specification.glyphs then
+                -- we only want some metadata
+            else
+                local cid = d.cid
+                if cid and cid.fdselect then
+                    readfdselect(f,data,glyphs,specification.shapes or false)
+                else
+                    readnoselect(f,data,glyphs,specification.shapes or false)
+                end
+            end
+            --
+            -- cleanup (probably more can go)
+            --
+         -- for i=1,#dictionaries do
+         --     local d = dictionaries[i]
+         --     d.subroutines = nil
+         -- end
+         -- data.strings = nil
+         -- if data then
+         --     data.charstrings  = nil
+         --     data.routines     = nil
+         -- end
+        end
+    end
+end