pyx/font/pfmfile.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2007-2011 André Wobst <wobsta@users.sourceforge.net>
   5 #
   6 # This file is part of PyX (http://pyx.sourceforge.net/).
   7 #
   8 # PyX is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # PyX is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with PyX; if not, write to the Free Software
  20 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  21
  22 import struct
  23 import metric
  24
  25
  26 ansiglyphs = {"space": 32,
  27               "exclam": 33,
  28               "quotedbl": 34,
  29               "numbersign": 35,
  30               "dollar": 36,
  31               "percent": 37,
  32               "ampersand": 38,
  33               "quotesingle": 39,
  34               "parenleft": 40,
  35               "parenright": 41,
  36               "asterisk": 42,
  37               "plus": 43,
  38               "comma": 44,
  39               "hyphen": 45,
  40               "period": 46,
  41               "slash": 47,
  42               "zero": 48,
  43               "one": 49,
  44               "two": 50,
  45               "three": 51,
  46               "four": 52,
  47               "five": 53,
  48               "six": 54,
  49               "seven": 55,
  50               "eight": 56,
  51               "nine": 57,
  52               "colon": 58,
  53               "semicolon": 59,
  54               "less": 60,
  55               "equal": 61,
  56               "greater": 62,
  57               "question": 63,
  58               "at": 64,
  59               "A": 65,
  60               "B": 66,
  61               "C": 67,
  62               "D": 68,
  63               "E": 69,
  64               "F": 70,
  65               "G": 71,
  66               "H": 72,
  67               "I": 73,
  68               "J": 74,
  69               "K": 75,
  70               "L": 76,
  71               "M": 77,
  72               "N": 78,
  73               "O": 79,
  74               "P": 80,
  75               "Q": 81,
  76               "R": 82,
  77               "S": 83,
  78               "T": 84,
  79               "U": 85,
  80               "V": 86,
  81               "W": 87,
  82               "X": 88,
  83               "Y": 89,
  84               "Z": 90,
  85               "bracketleft": 91,
  86               "backslash": 92,
  87               "bracketright": 93,
  88               "asciicircum": 94,
  89               "underscore": 95,
  90               "grave": 96,
  91               "a": 97,
  92               "b": 98,
  93               "c": 99,
  94               "d": 100,
  95               "e":101,
  96               "f":102,
  97               "g":103,
  98               "h":104,
  99               "i":105,
 100               "j":106,
 101               "k":107,
 102               "l":108,
 103               "m":109,
 104               "n":110,
 105               "o":111,
 106               "p":112,
 107               "q":113,
 108               "r":114,
 109               "s":115,
 110               "t":116,
 111               "u":117,
 112               "v":118,
 113               "w":119,
 114               "x":120,
 115               "y":121,
 116               "z":122,
 117               "braceleft":123,
 118               "bar":124,
 119               "braceright":125,
 120               "asciitilde":126,
 121               "bullet":127,
 122               "Euro":128,
 123               "bullet":129,
 124               "quotesinglbase":130,
 125               "florin":131,
 126               "quotedblbase":132,
 127               "ellipsis":133,
 128               "dagger":134,
 129               "daggerdbl":135,
 130               "circumflex":136,
 131               "perthousand":137,
 132               "Scaron":138,
 133               "guilsinglleft":139,
 134               "OE":140,
 135               "bullet":141,
 136               "Zcaron":142,
 137               "bullet":143,
 138               "bullet":144,
 139               "quoteleft":145,
 140               "quoteright":146,
 141               "quotedblleft":147,
 142               "quotedblright":148,
 143               "bullet":149,
 144               "endash":150,
 145               "emdash":151,
 146               "tilde":152,
 147               "trademark":153,
 148               "scaron":154,
 149               "guilsinglright":155,
 150               "oe":156,
 151               "bullet":157,
 152               "zcaron":158,
 153               "Ydieresis":159,
 154               "space":160,
 155               "exclamdown":161,
 156               "cent":162,
 157               "sterling":163,
 158               "currency":164,
 159               "yen":165,
 160               "brokenbar":166,
 161               "section":167,
 162               "dieresis":168,
 163               "copyright":169,
 164               "ordfeminine":170,
 165               "guillemotleft":171,
 166               "logicalnot":172,
 167               "hyphen":173,
 168               "registered":174,
 169               "macron":175,
 170               "degree":176,
 171               "plusminus":177,
 172               "twosuperior":178,
 173               "threesuperior":179,
 174               "acute":180,
 175               "mu":181,
 176               "paragraph":182,
 177               "periodcentered":183,
 178               "cedilla":184,
 179               "onesuperior":185,
 180               "ordmasculine":186,
 181               "guillemotright":187,
 182               "onequarter":188,
 183               "onehalf":189,
 184               "threequarters":190,
 185               "questiondown":191,
 186               "Agrave":192,
 187               "Aacute":193,
 188               "Acircumflex":194,
 189               "Atilde":195,
 190               "Adieresis":196,
 191               "Aring":197,
 192               "AE":198,
 193               "Ccedilla":199,
 194               "Egrave":200,
 195               "Eacute":201,
 196               "Ecircumflex":202,
 197               "Edieresis":203,
 198               "Igrave":204,
 199               "Iacute":205,
 200               "Icircumflex":206,
 201               "Idieresis":207,
 202               "Eth":208,
 203               "Ntilde":209,
 204               "Ograve":210,
 205               "Oacute":211,
 206               "Ocircumflex":212,
 207               "Otilde":213,
 208               "Odieresis":214,
 209               "multiply":215,
 210               "Oslash":216,
 211               "Ugrave":217,
 212               "Uacute":218,
 213               "Ucircumflex":219,
 214               "Udieresis":220,
 215               "Yacute":221,
 216               "Thorn":222,
 217               "germandbls":223,
 218               "agrave":224,
 219               "aacute":225,
 220               "acircumflex":226,
 221               "atilde":227,
 222               "adieresis":228,
 223               "aring":229,
 224               "ae":230,
 225               "ccedilla":231,
 226               "egrave":232,
 227               "eacute":233,
 228               "ecircumflex":234,
 229               "edieresis":235,
 230               "igrave":236,
 231               "iacute":237,
 232               "icircumflex":238,
 233               "idieresis":239,
 234               "eth":240,
 235               "ntilde":241,
 236               "ograve":242,
 237               "oacute":243,
 238               "ocircumflex":244,
 239               "otilde":245,
 240               "odieresis":246,
 241               "divide":247,
 242               "oslash":248,
 243               "ugrave":249,
 244               "uacute":250,
 245               "ucircumflex":251,
 246               "udieresis":252,
 247               "yacute":253,
 248               "thorn":254,
 249               "ydieresis":255}
 250
 251 def _readNullString(file):
 252     s = []
 253     c = file.read(1)
 254     while c and c != "\0":
 255         s.append(c)
 256         c = file.read(1)
 257     return "".join(s)
 258
 259
 260 class PFMfile(metric.metric):
 261
 262     def __init__(self, file):
 263         (self.dfVersion, self.dfSize, self.dfCopyright, self.dfType,
 264          self.dfPoint, self.dfVertRes, self.dfHorizRes, self.dfAscent,
 265          self.dfInternalLeading, self.dfExternalLeading, self.dfItalic,
 266          self.dfUnderline, self.dfStrikeOut, self.dfWeight,
 267          self.dfCharSet, self.dfPixWidth, self.dfPixHeight,
 268          self.dfPitchAndFamily, self.dfAvgWidth, self.dfMaxWidth,
 269          self.dfFirstChar, self.dfLastChar, self.dfDefaultChar,
 270          self.dfBreakChar, self.dfWidthBytes, self.dfDevice, self.dfFace,
 271          self.dfBitsPointer, self.dfBitsOffset) = struct.unpack("<HL60s7H3BHB2HB2H4BH4L", file.read(117))
 272         self.dfCopyright = self.dfCopyright.split("\000", 1)[0]
 273         (self.dfSizeFields, self.dfExtMetricsOffset, self.dfExtentTable,
 274          self.dfOriginTable, self.dfPairKernTable, self.dfTrackKernTable,
 275          self.dfDriverInfo, self.dfReserved) = struct.unpack("<H7L", file.read(30))
 276         if self.dfDevice == 0:
 277             raise ValueError("DeviceName is required for Type1 pfm files.")
 278         file.seek(self.dfDevice)
 279         self.deviceName = _readNullString(file)
 280         if self.deviceName.lower() != "postscript":
 281             raise ValueError("Can process pfm files for PostScript fonts only.")
 282         if self.dfVersion != 0x100:
 283             raise ValueError("Invalid pfm file version.")
 284         if self.dfType != 0x81:
 285             raise ValueError("Not a Type1 pfm file.")
 286         if self.dfFace == 0:
 287             raise ValueError("FaceName is required for Type1 pfm files.")
 288         if self.dfExtMetricsOffset == 0:
 289             raise ValueError("ExtTextMetrics is required for Type1 pfm files.")
 290         if self.dfExtentTable == 0:
 291             raise ValueError("ExtentTable is required for Type1 pfm files.")
 292         if self.dfOriginTable != 0:
 293             raise ValueError("OriginTable is forbidden for Type1 pfm files.")
 294         if self.dfDriverInfo == 0:
 295             raise ValueError("DriverInfo is required for Type1 pfm files.")
 296         # assert self.dfReserved == 0 (must be zero according to the spec, but we don't care)
 297         file.seek(self.dfExtMetricsOffset)
 298         (etmSize, self.etmPointSize, self.etmOrientation,
 299          self.etmMasterHeight, self.etmMinScale, self.etmMaxScale,
 300          self.etmMasterUnits, self.etmCapHeight, self.etmXHeight,
 301          self.etmLowerCaseAscent, self.etmLowerCaseDescent, self.etmSlant,
 302          self.etmSuperScript, self.etmSubScript, self.etmSuperScriptSize,
 303          self.etmSubScriptSize, self.etmUnderlineOffset,
 304          self.etmUnderlineWidth, self.etmDoubleUpperUnderlineOffset,
 305          self.etmDoubleLowerUnderlineOffset, self.etmDoubleUpperUnderlineWidth,
 306          self.etmDoubleLowerUnderlineWidth, self.etmStrikeOutOffset,
 307          self.etmStrikeOutWidth, self.etmKernPairs, self.etmKernTracks) = struct.unpack("<24h2H", file.read(52))
 308         print self.etmMasterHeight, self.etmMasterUnits, self.etmPointSize, self.etmOrientation
 309         file.seek(self.dfFace)
 310         self.faceName = _readNullString(file)
 311         file.seek(self.dfDriverInfo)
 312         self.driverInfo = _readNullString(file)
 313         file.seek(self.dfExtentTable)
 314         count = self.dfLastChar - self.dfFirstChar + 1
 315         self.widths = struct.unpack("<%dH" % count, file.read(2*count))
 316         self.kernpairs = []
 317         self.kernpairsdict = {}
 318         if self.dfPairKernTable:
 319             file.seek(self.dfPairKernTable)
 320             pairs, = struct.unpack("<H", file.read(2))
 321             if pairs != self.etmKernPairs:
 322                 raise ValueError("number of kerning pairs mismatch in pfm file.")
 323             for i in range(self.etmKernPairs):
 324                 kpFirst, kpSecond, kpKernAmount = struct.unpack("<BBh", file.read(4))
 325                 self.kernpairs.append((kpFirst, kpSecond, kpKernAmount))
 326                 self.kernpairsdict[(kpFirst, kpSecond)] = kpKernAmount
 327         self.trackkerns = []
 328         if self.dfTrackKernTable:
 329             file.seek(self.dfTrackKernTable)
 330             items, = struct.unpack("<H", file.read(2))
 331             if items != self.etmKernTracks:
 332                 raise ValueError("number of kerning tracks mismatch in pfm file.")
 333             for i in range(self.etmKernTracks):
 334                 # each item consists of the tuple ktDegree, ktMinSize, ktMinAmount, ktMaxSize, ktMaxAmount
 335                 self.trackkerns.append(struct.unpack("<hhhhh", file.read(10)))
 336         if self.dfCharSet:
 337             raise ValueError("PFM font matrices are currently supported for ansi encoded fonts only.")
 338
 339     def width_ds(self, glyphname):
 340         return self.widths[ansiglyphs[glyphname]-self.dfFirstChar]
 341
 342     def width_pt(self, glyphnames, size_pt):
 343         return sum([self.widths[ansiglyphs[glyphname]-self.dfFirstChar] for glyphname in glyphnames])*size_pt/1000.0
 344
 345     def height_pt(self, glyphnames, size_pt):
 346         return self.dfAscent*size_pt/1000.0
 347
 348     def depth_pt(self, glyphnames, size_pt):
 349         return -self.etmLowerCaseDescent*size_pt/1000.0
 350
 351     def resolvekernings(self, glyphnames, size_pt=None):
 352         result = [None]*(2*len(glyphnames)-1)
 353         for i, glyphname in enumerate(glyphnames):
 354             result[2*i] = glyphname
 355         return result
 356
 357     def resolvekernings(self, glyphnames, size_pt=None):
 358         result = [None]*(2*len(glyphnames)-1)
 359         for i, glyphname in enumerate(glyphnames):
 360             result[2*i] = glyphname
 361             if i:
 362                 amount = self.kernpairsdict.get((ansiglyphs[glyphnames[i-1]], ansiglyphs[glyphname]))
 363                 if amount:
 364                     if size_pt is not None:
 365                         result[2*i-1] = amount*size_pt/1000.0
 366                     else:
 367                         result[2*i-1] = amount
 368         return result
 369
 370
 371     def writePDFfontinfo(self, file, seriffont=False, symbolfont=True):
 372         flags = 0
 373         if self.dfMaxWidth == self.dfAvgWidth:
 374             flags += 1<<0
 375         if seriffont:
 376             flags += 1<<1
 377         if symbolfont:
 378             flags += 1<<2
 379         else:
 380             flags += 1<<5
 381         if self.dfItalic:
 382             flags += 1<<6
 383         file.write("/Flags %d\n" % flags)
 384         file.write("/ItalicAngles %d\n" % (self.etmSlant/10))
 385         file.write("/Ascent %d\n" % self.dfAscent)
 386         file.write("/Descent %d\n" % self.etmLowerCaseDescent)
 387         file.write("/FontBBox [0 %d 1000 %d]\n" % (self.etmLowerCaseDescent, self.dfAscent))
 388         file.write("/CapHeight %d\n" % self.dfAscent)
 389         if self.dfWeight >= 600:
 390             stemv = 120
 391         else:
 392             stemv = 70
 393         file.write("/StemV %d\n" % stemv)
 394