pyx/dvifile.py

   1 #!/usr/bin/env python
   2 # -*- coding: ISO-8859-1 -*-
   3 #
   4 #
   5 # Copyright (C) 2002-2003 Jörg Lehmann <joergl@users.sourceforge.net>
   6 # Copyright (C) 2002-2003 André Wobst <wobsta@users.sourceforge.net>
   7 # Copyright (C) 2003 Michael Schindler <m-schindler@users.sourceforge.net>
   8 #
   9 # This file is part of PyX (http://pyx.sourceforge.net/).
  10 #
  11 # PyX is free software; you can redistribute it and/or modify
  12 # it under the terms of the GNU General Public License as published by
  13 # the Free Software Foundation; either version 2 of the License, or
  14 # (at your option) any later version.
  15 #
  16 # PyX is distributed in the hope that it will be useful,
  17 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 # GNU General Public License for more details.
  20 #
  21 # You should have received a copy of the GNU General Public License
  22 # along with PyX; if not, write to the Free Software
  23 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24
  25 import copy, cStringIO, exceptions, re, struct, string, sys
  26 import unit, epsfile, bbox, base, canvas, color, trafo, path, prolog, pykpathsea
  27
  28 class fix_word:
  29     def __init__(self, word):
  30         if word >= 0:
  31             self.sign = 1
  32         else:
  33             self.sign = -1
  34
  35         self.precomma = abs(word) >> 20
  36         self.postcomma = abs(word) & 0xFFFFF
  37
  38     def __float__(self):
  39         return self.sign * (self.precomma + 1.0*self.postcomma/0xFFFFF)
  40
  41     def __mul__(self, other):
  42         # hey, it's Q&D
  43         result = fix_word(0)
  44
  45         result.sign = self.sign*other.sign
  46         c = self.postcomma*other.precomma + self.precomma*other.postcomma
  47         result.precomma = self.precomma*other.precomma + (c >> 20)
  48         result.postcomma = c & 0xFFFFF + ((self.postcomma*other.postcomma) >> 40)
  49         return result
  50
  51
  52 class binfile:
  53
  54     def __init__(self, filename, mode="r"):
  55         self.file = open(filename, mode)
  56
  57     def close(self):
  58         self.file.close()
  59
  60     def tell(self):
  61         return self.file.tell()
  62
  63     def eof(self):
  64         return self.file.eof()
  65
  66     def read(self, bytes):
  67         return self.file.read(bytes)
  68
  69     def readint(self, bytes=4, signed=0):
  70         first = 1
  71         result = 0
  72         while bytes:
  73             value = ord(self.file.read(1))
  74             if first and signed and value > 127:
  75                 value -= 256
  76             first = 0
  77             result = 256 * result + value
  78             bytes -= 1
  79         return result
  80
  81     def readint32(self):
  82         return struct.unpack(">l", self.file.read(4))[0]
  83
  84     def readuint32(self):
  85         return struct.unpack(">L", self.file.read(4))[0]
  86
  87     def readint24(self):
  88         # XXX: checkme
  89         return struct.unpack(">l", "\0"+self.file.read(3))[0]
  90
  91     def readuint24(self):
  92         # XXX: checkme
  93         return struct.unpack(">L", "\0"+self.file.read(3))[0]
  94
  95     def readint16(self):
  96         return struct.unpack(">h", self.file.read(2))[0]
  97
  98     def readuint16(self):
  99         return struct.unpack(">H", self.file.read(2))[0]
 100
 101     def readchar(self):
 102         return struct.unpack("b", self.file.read(1))[0]
 103
 104     def readuchar(self):
 105         return struct.unpack("B", self.file.read(1))[0]
 106
 107     def readstring(self, bytes):
 108         l = self.readuchar()
 109         assert l <= bytes-1, "inconsistency in file: string too long"
 110         return self.file.read(bytes-1)[:l]
 111
 112 class stringbinfile(binfile):
 113
 114     def __init__(self, s):
 115         self.file = cStringIO.StringIO(s)
 116
 117
 118 # class tokenfile:
 119 #     """ ascii file containing tokens separated by spaces.
 120 #
 121 #     Comments beginning with % are ignored. Strings containing spaces
 122 #     are not handled correctly
 123 #     """
 124 #
 125 #     def __init__(self, filename):
 126 #         self.file = open(filename, "r")
 127 #         self.line = None
 128 #
 129 #     def gettoken(self):
 130 #         """ return next token or None if EOF """
 131 #         while not self.line:
 132 #             line = self.file.readline()
 133 #             if line == "":
 134 #                 return None
 135 #             self.line = line.split("%")[0].split()
 136 #         token = self.line[0]
 137 #         self.line = self.line[1:]
 138 #         return token
 139 #
 140 #     def close(self):
 141 #         self.file.close()
 142
 143
 144 ##############################################################################
 145 # TFM file handling
 146 ##############################################################################
 147
 148 class TFMError(exceptions.Exception): pass
 149
 150
 151 class char_info_word:
 152     def __init__(self, word):
 153         self.width_index  = int((word & 0xFF000000L) >> 24) #make sign-safe
 154         self.height_index = (word & 0x00F00000) >> 20
 155         self.depth_index  = (word & 0x000F0000) >> 16
 156         self.italic_index = (word & 0x0000FC00) >> 10
 157         self.tag          = (word & 0x00000300) >> 8
 158         self.remainder    = (word & 0x000000FF)
 159
 160
 161 class tfmfile:
 162     def __init__(self, name, debug=0):
 163         self.file = binfile(name, "rb")
 164         self.debug = debug
 165
 166         #
 167         # read pre header
 168         #
 169
 170         self.lf = self.file.readint16()
 171         self.lh = self.file.readint16()
 172         self.bc = self.file.readint16()
 173         self.ec = self.file.readint16()
 174         self.nw = self.file.readint16()
 175         self.nh = self.file.readint16()
 176         self.nd = self.file.readint16()
 177         self.ni = self.file.readint16()
 178         self.nl = self.file.readint16()
 179         self.nk = self.file.readint16()
 180         self.ne = self.file.readint16()
 181         self.np = self.file.readint16()
 182
 183         if not (self.bc-1 <= self.ec <= 255 and
 184                 self.ne <= 256 and
 185                 self.lf == 6+self.lh+(self.ec-self.bc+1)+self.nw+self.nh+self.nd
 186                 +self.ni+self.nl+self.nk+self.ne+self.np):
 187             raise TFMError, "error in TFM pre-header"
 188
 189         if debug:
 190             print "lh=%d" % self.lh
 191
 192         #
 193         # read header
 194         #
 195
 196         self.checksum = self.file.readint32()
 197         self.designsizeraw = self.file.readint32()
 198         assert self.designsizeraw > 0, "invald design size"
 199         self.designsize = fix_word(self.designsizeraw)
 200         if self.lh > 2:
 201             assert self.lh > 11, "inconsistency in TFM file: incomplete field"
 202             self.charcoding = self.file.readstring(40)
 203         else:
 204             self.charcoding = None
 205
 206         if self.lh > 12:
 207             assert self.lh > 16, "inconsistency in TFM file: incomplete field"
 208             self.fontfamily = self.file.readstring(20)
 209         else:
 210             self.fontfamily = None
 211
 212         if self.debug:
 213             print "(FAMILY %s)" % self.fontfamily
 214             print "(CODINGSCHEME %s)" % self.charcoding
 215             print "(DESINGSIZE R %f)" % self.designsize
 216
 217         if self.lh > 17:
 218             self.sevenbitsave = self.file.readuchar()
 219             # ignore the following two bytes
 220             self.file.readint16()
 221             facechar = self.file.readuchar()
 222             # decode ugly face specification into the Knuth suggested string
 223             if facechar < 18:
 224                 if facechar >= 12:
 225                     self.face = "E"
 226                     facechar -= 12
 227                 elif facechar >= 6:
 228                     self.face = "C"
 229                     facechar -= 6
 230                 else:
 231                     self.face = "R"
 232
 233                 if facechar >= 4:
 234                     self.face = "L" + self.face
 235                     facechar -= 4
 236                 elif facechar >= 2:
 237                     self.face = "B" + self.face
 238                     facechar -= 2
 239                 else:
 240                     self.face = "M" + self.face
 241
 242                 if facechar == 1:
 243                     self.face = self.face[0] + "I" + self.face[1]
 244                 else:
 245                     self.face = self.face[0] + "R" + self.face[1]
 246
 247             else:
 248                 self.face = None
 249         else:
 250             self.sevenbitsave = self.face = None
 251
 252         if self.lh > 18:
 253             # just ignore the rest
 254             print self.file.read((self.lh-18)*4)
 255
 256         #
 257         # read char_info
 258         #
 259
 260         self.char_info = [None]*(self.ec+1)
 261
 262         for charcode in range(self.bc, self.ec+1):
 263             self.char_info[charcode] = char_info_word(self.file.readint32())
 264             if self.char_info[charcode].width_index == 0:
 265                 # disable character if width_index is zero
 266                 self.char_info[charcode] = None
 267
 268         #
 269         # read widths
 270         #
 271
 272         self.width = [None for width_index in range(self.nw)]
 273         for width_index in range(self.nw):
 274             # self.width[width_index] = fix_word(self.file.readint32())
 275             self.width[width_index] = self.file.readint32()
 276
 277         #
 278         # read heights
 279         #
 280
 281         self.height = [None for height_index in range(self.nh)]
 282         for height_index in range(self.nh):
 283             # self.height[height_index] = fix_word(self.file.readint32())
 284             self.height[height_index] = self.file.readint32()
 285
 286         #
 287         # read depths
 288         #
 289
 290         self.depth = [None for depth_index in range(self.nd)]
 291         for depth_index in range(self.nd):
 292             # self.depth[depth_index] = fix_word(self.file.readint32())
 293             self.depth[depth_index] = self.file.readint32()
 294
 295         #
 296         # read italic
 297         #
 298
 299         self.italic = [None for italic_index in range(self.ni)]
 300         for italic_index in range(self.ni):
 301             # self.italic[italic_index] = fix_word(self.file.readint32())
 302             self.italic[italic_index] = self.file.readint32()
 303
 304         #
 305         # read lig_kern
 306         #
 307
 308         # XXX decode to lig_kern_command
 309
 310         self.lig_kern = [None for lig_kern_index in range(self.nl)]
 311         for lig_kern_index in range(self.nl):
 312             self.lig_kern[lig_kern_index] = self.file.readint32()
 313
 314         #
 315         # read kern
 316         #
 317
 318         self.kern = [None for kern_index in range(self.nk)]
 319         for kern_index in range(self.nk):
 320             # self.kern[kern_index] = fix_word(self.file.readint32())
 321             self.kern[kern_index] = self.file.readint32()
 322
 323         #
 324         # read exten
 325         #
 326
 327         # XXX decode to extensible_recipe
 328
 329         self.exten = [None for exten_index in range(self.ne)]
 330         for exten_index in range(self.ne):
 331             self.exten[exten_index] = self.file.readint32()
 332
 333         #
 334         # read param
 335         #
 336
 337         # XXX decode
 338
 339         self.param = [None for param_index in range(self.np)]
 340         for param_index in range(self.np):
 341             self.param[param_index] = self.file.readint32()
 342
 343         self.file.close()
 344
 345
 346 # class FontEncoding:
 347 #
 348 #     def __init__(self, filename):
 349 #         """ font encoding contained in filename """
 350 #         encpath = pykpathsea.find_file(filename, pykpathsea.kpse_tex_ps_header_format)
 351 #         encfile = tokenfile(encpath)
 352 #
 353 #         # name of encoding
 354 #         self.encname = encfile.gettoken()
 355 #         token = encfile.gettoken()
 356 #         if token != "[":
 357 #             raise RuntimeError("cannot parse encoding file '%s', expecting '[' got '%s'" % (filename, token))
 358 #         self.encvector = []
 359 #         for i in range(256):
 360 #             token = encfile.gettoken()
 361 #             if token is None or token=="]":
 362 #                 raise RuntimeError("not enough charcodes in encoding file '%s'" % filename)
 363 #             self.encvector.append(token)
 364 #         if encfile.gettoken() != "]":
 365 #             raise RuntimeError("too many charcodes in encoding file '%s'" % filename)
 366 #         token = encfile.gettoken()
 367 #         if token != "def":
 368 #             raise RuntimeError("cannot parse encoding file '%s', expecting 'def' got '%s'" % (filename, token))
 369 #         token = encfile.gettoken()
 370 #         if token != None:
 371 #             raise RuntimeError("encoding file '%s' too long" % filename)
 372 #         encfile.close()
 373 #
 374 #     def encode(self, charcode):
 375 #         return self.encvector[charcode]
 376
 377 ##############################################################################
 378 # Font handling
 379 ##############################################################################
 380
 381 _ReEncodeFont = prolog.definition("ReEncodeFont", """{
 382   5 dict
 383   begin
 384     /newencoding exch def
 385     /newfontname exch def
 386     /basefontname exch def
 387     /basefontdict basefontname findfont def
 388     /newfontdict basefontdict maxlength dict def
 389     basefontdict {
 390       exch dup dup /FID ne exch /Encoding ne and
 391       { exch newfontdict 3 1 roll put }
 392       { pop pop }
 393       ifelse
 394     } forall
 395     newfontdict /FontName newfontname put
 396     newfontdict /Encoding newencoding put
 397     newfontname newfontdict definefont pop
 398   end
 399 }""")
 400
 401 #
 402 # PostScript font selection and output primitives
 403 #
 404
 405 class _selectfont(base.PSOp):
 406     def __init__(self, name, size):
 407         self.name = name
 408         self.size = size
 409
 410     def write(self, file):
 411         file.write("/%s %f selectfont\n" % (self.name, self.size))
 412
 413
 414 class selectfont(_selectfont):
 415     def __init__(self, font):
 416         _selectfont.__init__(self, font.getpsname(), font.getsize())
 417         self.font = font
 418
 419     def prolog(self):
 420         result = [prolog.fontdefinition(self.font.getbasepsname(),
 421                                         self.font.getfontfile(),
 422                                         self.font.getencodingfile(),
 423                                         self.font.usedchars)]
 424         if self.font.getencoding():
 425             result.append(_ReEncodeFont)
 426             result.append(prolog.fontencoding(self.font.getencoding(), self.font.getencodingfile()))
 427             result.append(prolog.fontreencoding(self.font.getpsname(), self.font.getbasepsname(), self.font.getencoding()))
 428         return result
 429
 430
 431 class _show(base.PSOp):
 432     def __init__(self, x, y, s):
 433         self.x = x
 434         self.y = y
 435         self.s = s
 436
 437     def write(self, file):
 438         file.write("%f %f moveto (%s) show\n" % (self.x, self.y, self.s))
 439
 440
 441 class fontmapping:
 442
 443     tokenpattern = re.compile(r'"(.*?)("\s+|"$|$)|(.*?)(\s+|$)')
 444
 445     def __init__(self, s):
 446         """ construct font mapping from line s of font mapping file """
 447         self.texname = self.basepsname = self.fontfile = None
 448
 449         # standard encoding
 450         self.encodingfile = None
 451
 452         # supported postscript fragments occuring in psfonts.map
 453         self.reencodefont = self.extendfont = self.slantfont = None
 454
 455         tokens = []
 456         while len(s):
 457             match = self.tokenpattern.match(s)
 458             if match:
 459                 if match.groups()[0]:
 460                     tokens.append('"%s"' % match.groups()[0])
 461                 else:
 462                     tokens.append(match.groups()[2])
 463                 s = s[match.end():]
 464             else:
 465                 raise RuntimeError("wrong syntax")
 466
 467         for token in tokens:
 468             if token.startswith("<"):
 469                 if token.startswith("<<"):
 470                     # XXX: support non-partial download here
 471                     self.fontfile = token[2:]
 472                 elif token.startswith("<["):
 473                     self.encodingfile = token[2:]
 474                 elif token.endswith(".pfa") or token.endswith(".pfb"):
 475                     self.fontfile = token[1:]
 476                 elif token.endswith(".enc"):
 477                     self.encodingfile = token[1:]
 478                 else:
 479                     raise RuntimeError("wrong syntax")
 480             elif token.startswith('"'):
 481                 pscode = token[1:-1].split()
 482                 # parse standard postscript code fragments
 483                 while pscode:
 484                     try:
 485                         arg, cmd = pscode[:2]
 486                     except:
 487                         raise RuntimeError("Unsupported Postscript fragment '%s'" % pscode)
 488                     pscode = pscode[2:]
 489                     if cmd == "ReEncodeFont":
 490                         self.reencodefont = arg
 491                     elif cmd == "ExtendFont":
 492                         self.extendfont = arg
 493                     elif cmd == "SlantFont":
 494                         self.slantfont = arg
 495                     else:
 496                         raise RuntimeError("Unsupported Postscript fragment '%s %s'" % (arg, cmd))
 497             else:
 498                 if self.texname is None:
 499                     self.texname = token
 500                 else:
 501                     self.basepsname = token
 502         if self.basepsname is None:
 503             self.basepsname = self.texname
 504
 505     def __str__(self):
 506         return ("'%s' is '%s' read from '%s' encoded as '%s'" %
 507                 (self.texname, self.basepsname, self.fontfile, repr(self.encodingfile)))
 508
 509 # generate fontmap
 510
 511 def readfontmap(filenames):
 512     """ read font map from filename (without path) """
 513     fontmap = {}
 514     for filename in filenames:
 515         mappath = pykpathsea.find_file(filename, pykpathsea.kpse_dvips_config_format)
 516         if not mappath:
 517             raise RuntimeError("cannot find font mapping file '%s'" % filename)
 518         mapfile = open(mappath, "r")
 519         lineno = 0
 520         for line in mapfile.readlines():
 521             lineno += 1
 522             line = line.rstrip()
 523             if not (line=="" or line[0] in (" ", "%", "*", ";" , "#")):
 524                 try:
 525                     fm = fontmapping(line)
 526                 except RuntimeError, e:
 527                     sys.stderr.write("*** PyX Warning: Ignoring line %i in mapping file '%s': %s\n" % (lineno, filename, e))
 528                 else:
 529                     fontmap[fm.texname] = fm
 530         mapfile.close()
 531     return fontmap
 532
 533
 534 class font:
 535     def __init__(self, name, c, q, d, debug=0):
 536         self.name = name
 537         self.q = q                  # desired size of font (fix_word) in tex points
 538         self.d = d                  # design size of font (fix_word) in tex points
 539         tfmpath = pykpathsea.find_file("%s.tfm" % self.name, pykpathsea.kpse_tfm_format)
 540         if not tfmpath:
 541             raise TFMError("cannot find %s.tfm" % self.name)
 542         self.tfmfile = tfmfile(tfmpath, debug)
 543
 544         # We only check for equality of font checksums if none of them
 545         # is zero. The case c == 0 happend in some VF files and
 546         # according to the VFtoVP documentation, paragraph 40, a check
 547         # is only performed if tfmfile.checksum > 0. Anyhow, begin
 548         # more generous here seems to be reasonable
 549         if self.tfmfile.checksum != c and self.tfmfile.checksum != 0 and c !=0:
 550             raise DVIError("check sums do not agree: %d vs. %d" %
 551                            (self.tfmfile.checksum, c))
 552
 553         # tfmfile.designsizeraw is the design size of the font as a fix_word
 554         if abs(self.tfmfile.designsizeraw - d) > 2:
 555             raise DVIError("design sizes do not agree: %d vs. %d" % (tfmdesignsize, d))
 556         if q < 0 or q > 134217728:
 557             raise DVIError("font '%s' not loaded: bad scale" % self.name)
 558         if d < 0 or d > 134217728:
 559             raise DVIError("font '%s' not loaded: bad design size" % self.name)
 560
 561         self.scale = 1.0*q/d
 562
 563         # for bookkeeping of used characters
 564         self.usedchars = [0] * 256
 565
 566     def __str__(self):
 567         return "font %s designed at %g tex pts used at %g tex pts" % (self.name,
 568                                                                       16.0*self.d/16777216L,
 569                                                                       16.0*self.q/16777216L)
 570
 571
 572     __repr__ = __str__
 573
 574     def getsize(self):
 575         """ return size of font in (PS) points """
 576         # The factor 16L/16777216L=2**(-20) converts a fix_word (here self.q)
 577         # to the corresponding float. Furthermore, we have to convert from TeX
 578         # points to points, hence the factor 72/72.27.
 579         return 16L*self.q/16777216L*72/72.27
 580
 581     def _convert(self, width):
 582         return 16L*width*self.q/16777216L
 583
 584     def getwidth(self, charcode):
 585         return self._convert(self.tfmfile.width[self.tfmfile.char_info[charcode].width_index])
 586
 587     def getheight(self, charcode):
 588         return self._convert(self.tfmfile.height[self.tfmfile.char_info[charcode].height_index])
 589
 590     def getdepth(self, charcode):
 591         return self._convert(self.tfmfile.depth[self.tfmfile.char_info[charcode].depth_index])
 592
 593     def getitalic(self, charcode):
 594         return self._convert(self.tfmfile.italic[self.tfmfile.char_info[charcode].italic_index])
 595
 596     def markcharused(self, charcode):
 597         self.usedchars[charcode] = 1
 598
 599     def mergeusedchars(self, otherfont):
 600         for i in range(len(self.usedchars)):
 601             self.usedchars[i] = self.usedchars[i] or otherfont.usedchars[i]
 602
 603     def clearusedchars(self):
 604         self.usedchars = [0] * 256
 605
 606
 607 class type1font(font):
 608     def __init__(self, name, c, q, d, fontmap, debug=0):
 609         font.__init__(self, name, c, q, d, debug)
 610         self.fontmapping = fontmap.get(name)
 611         if self.fontmapping is None:
 612             raise RuntimeError("no information for font '%s' found in font mapping file, aborting" % name)
 613
 614     def getbasepsname(self):
 615         return self.fontmapping.basepsname
 616
 617     def getpsname(self):
 618         if self.fontmapping.reencodefont:
 619             return "%s-%s" % (self.fontmapping.basepsname, self.fontmapping.reencodefont)
 620         else:
 621             return self.fontmapping.basepsname
 622
 623     def getfontfile(self):
 624         return self.fontmapping.fontfile
 625
 626     def getencoding(self):
 627         return self.fontmapping.reencodefont
 628
 629     def getencodingfile(self):
 630         return self.fontmapping.encodingfile
 631
 632
 633 class virtualfont(font):
 634     def __init__(self, name, c, q, d, fontmap, debug=0):
 635         font.__init__(self, name, c, q, d, debug)
 636         fontpath = pykpathsea.find_file(name, pykpathsea.kpse_vf_format)
 637         if fontpath is None or not len(fontpath):
 638             raise RuntimeError
 639         self.vffile = vffile(fontpath, self.scale, fontmap, debug > 1)
 640
 641     def getfonts(self):
 642         """ return fonts used in virtual font itself """
 643         return self.vffile.getfonts()
 644
 645     def getchar(self, cc):
 646         """ return dvi chunk corresponding to char code cc """
 647         return self.vffile.getchar(cc)
 648
 649
 650 ##############################################################################
 651 # DVI file handling
 652 ##############################################################################
 653
 654 _DVI_CHARMIN     =   0 # typeset a character and move right (range min)
 655 _DVI_CHARMAX     = 127 # typeset a character and move right (range max)
 656 _DVI_SET1234     = 128 # typeset a character and move right
 657 _DVI_SETRULE     = 132 # typeset a rule and move right
 658 _DVI_PUT1234     = 133 # typeset a character
 659 _DVI_PUTRULE     = 137 # typeset a rule
 660 _DVI_NOP         = 138 # no operation
 661 _DVI_BOP         = 139 # beginning of page
 662 _DVI_EOP         = 140 # ending of page
 663 _DVI_PUSH        = 141 # save the current positions (h, v, w, x, y, z)
 664 _DVI_POP         = 142 # restore positions (h, v, w, x, y, z)
 665 _DVI_RIGHT1234   = 143 # move right
 666 _DVI_W0          = 147 # move right by w
 667 _DVI_W1234       = 148 # move right and set w
 668 _DVI_X0          = 152 # move right by x
 669 _DVI_X1234       = 153 # move right and set x
 670 _DVI_DOWN1234    = 157 # move down
 671 _DVI_Y0          = 161 # move down by y
 672 _DVI_Y1234       = 162 # move down and set y
 673 _DVI_Z0          = 166 # move down by z
 674 _DVI_Z1234       = 167 # move down and set z
 675 _DVI_FNTNUMMIN   = 171 # set current font (range min)
 676 _DVI_FNTNUMMAX   = 234 # set current font (range max)
 677 _DVI_FNT1234     = 235 # set current font
 678 _DVI_SPECIAL1234 = 239 # special (dvi extention)
 679 _DVI_FNTDEF1234  = 243 # define the meaning of a font number
 680 _DVI_PRE         = 247 # preamble
 681 _DVI_POST        = 248 # postamble beginning
 682 _DVI_POSTPOST    = 249 # postamble ending
 683
 684 _DVI_VERSION     = 2   # dvi version
 685
 686 # position variable indices
 687 _POS_H           = 0
 688 _POS_V           = 1
 689 _POS_W           = 2
 690 _POS_X           = 3
 691 _POS_Y           = 4
 692 _POS_Z           = 5
 693
 694 # reader states
 695 _READ_PRE       = 1
 696 _READ_NOPAGE    = 2
 697 _READ_PAGE      = 3
 698 _READ_POST      = 4 # XXX not used
 699 _READ_POSTPOST  = 5 # XXX not used
 700 _READ_DONE      = 6
 701
 702
 703 class DVIError(exceptions.Exception): pass
 704
 705 # save and restore colors
 706
 707 class _savecolor(base.PSOp):
 708     def write(self, file):
 709         file.write("currentcolor currentcolorspace\n")
 710
 711
 712 class _restorecolor(base.PSOp):
 713     def write(self, file):
 714         file.write("setcolorspace setcolor\n")
 715
 716 class _savetrafo(base.PSOp):
 717     def write(self, file):
 718         file.write("matrix currentmatrix\n")
 719
 720
 721 class _restoretrafo(base.PSOp):
 722     def write(self, file):
 723         file.write("setmatrix\n")
 724
 725
 726 class dvifile:
 727
 728     def __init__(self, filename, fontmap, debug=0):
 729         """ opens the dvi file and reads the preamble """
 730         self.filename = filename
 731         self.fontmap = fontmap
 732         self.debug = debug
 733
 734         self.fonts = {}
 735         self.activefont = None
 736
 737         # stack of fonts and fontscale currently used (used for VFs)
 738         self.fontstack = []
 739         self.stack = []
 740
 741         # pointer to currently active page
 742         self.actpage = None
 743
 744         # currently active output: position, content and type 1 font
 745         self.actoutstart = None
 746         self.actoutstring = ""
 747         self.actoutfont = None
 748
 749         # stack for self.file, self.fonts and self.stack, needed for VF inclusion
 750         self.statestack = []
 751
 752         self.file = binfile(self.filename, "rb")
 753
 754         # currently read byte in file (for debugging output)
 755         self.filepos = None
 756
 757         self._read_pre()
 758
 759     # helper routines
 760
 761     def flushout(self):
 762         """ flush currently active string """
 763         if self.actoutstart:
 764             x =  self.actoutstart[0] * self.conv
 765             y = -self.actoutstart[1] * self.conv
 766             if self.debug:
 767                 print "[%s]" % self.actoutstring
 768             self.actpage.insert(_show(x, y, self.actoutstring))
 769             self.actoutstart = None
 770
 771     def putrule(self, height, width, inch=1):
 772         self.flushout()
 773         x1 =  self.pos[_POS_H] * self.conv
 774         y1 = -self.pos[_POS_V] * self.conv
 775         w = width * self.conv
 776         h = height * self.conv
 777
 778         if height > 0 and width > 0:
 779             if self.debug:
 780                 pixelw = int(width*self.trueconv*self.mag/1000.0)
 781                 if pixelw < width*self.conv: pixelw += 1
 782                 pixelh = int(height*self.trueconv*self.mag/1000.0)
 783                 if pixelh < height*self.conv: pixelh += 1
 784
 785                 print ("%d: %srule height %d, width %d (%dx%d pixels)" %
 786                        (self.filepos, inch and "set" or "put", height, width, pixelh, pixelw))
 787             self.actpage.fill(path._rect(x1, y1, w, h))
 788         else:
 789             if self.debug:
 790                 print ("%d: %srule height %d, width %d (invisible)" %
 791                        (self.filepos, inch and "set" or "put", height, width))
 792
 793         if inch:
 794             if self.debug:
 795                 print (" h:=%d+%d=%d, hh:=%d" %
 796                    (self.pos[_POS_H], width, self.pos[_POS_H]+width, 0))
 797             self.pos[_POS_H] += width
 798
 799     def putchar(self, char, inch=1):
 800         dx = inch and int(round(self.activefont.getwidth(char)*self.tfmconv)) or 0
 801
 802         if self.debug:
 803             print ("%d: %schar%d h:=%d+%d=%d, hh:=%d" %
 804                    (self.filepos,
 805                     inch and "set" or "put",
 806                     char,
 807                     self.pos[_POS_H], dx, self.pos[_POS_H]+dx,
 808                     0))
 809
 810         if isinstance(self.activefont, type1font):
 811             if self.actoutstart is None:
 812                 self.actoutstart = self.pos[_POS_H], self.pos[_POS_V]
 813                 self.actoutstring = ""
 814             if char > 32 and char < 127 and chr(char) not in "()[]<>":
 815                 ascii = "%s" % chr(char)
 816             else:
 817                 ascii = "\\%03o" % char
 818             self.actoutstring = self.actoutstring + ascii
 819
 820             self.activefont.markcharused(char)
 821             self.pos[_POS_H] += dx
 822         else:
 823             # virtual font handling
 824             afterpos = list(self.pos)
 825             afterpos[_POS_H] += dx
 826             self._push_dvistring(self.activefont.getchar(char), self.activefont.getfonts(), afterpos,
 827                                  self.activefont.getsize())
 828
 829
 830         if not inch:
 831             # XXX: correct !?
 832             self.flushout()
 833
 834     def usefont(self, fontnum):
 835         if self.debug:
 836             print ("%d: fntnum%i current font is %s" %
 837                    (self.filepos,
 838                     fontnum, self.fonts[fontnum].name))
 839
 840         self.activefont = self.fonts[fontnum]
 841
 842         # if the new font is a type 1 font and if it is not already the
 843         # font being currently used for the output, we have to flush the
 844         # output and insert a selectfont statement in the PS code
 845         if isinstance(self.activefont, type1font) and self.actoutfont!=self.activefont:
 846             self.flushout()
 847             self.actpage.insert(selectfont(self.activefont))
 848             self.actoutfont = self.activefont
 849
 850     def definefont(self, cmdnr, num, c, q, d, fontname):
 851         # cmdnr: type of fontdef command (only used for debugging output)
 852         # c:     checksum
 853         # q:     scaling factor (fix_word)
 854         #        Note that q is actually s in large parts of the documentation.
 855         # d:     design size (fix_word)
 856
 857         try:
 858             font = virtualfont(fontname, c, q/self.tfmconv, d/self.tfmconv, self.fontmap, self.debug > 1)
 859         except (TypeError, RuntimeError):
 860             font = type1font(fontname, c, q/self.tfmconv, d/self.tfmconv, self.fontmap, self.debug > 1)
 861
 862         self.fonts[num] = font
 863
 864         if self.debug:
 865             print "%d: fntdef%d %i: %s" % (self.filepos, cmdnr, num, fontname)
 866
 867 #            scale = round((1000.0*self.conv*q)/(self.trueconv*d))
 868 #            m = 1.0*q/d
 869 #            scalestring = scale!=1000 and " scaled %d" % scale or ""
 870 #            print ("Font %i: %s%s---loaded at size %d DVI units" %
 871 #                   (num, fontname, scalestring, q))
 872 #            if scale!=1000:
 873 #                print " (this font is magnified %d%%)" % round(scale/10)
 874
 875     def special(self, s):
 876         self.flushout()
 877
 878         # it is in general not safe to continue using the currently active font because
 879         # the specials may involve some gsave/grestore operations
 880         # XXX: reset actoutfont only where strictly needed
 881         self.actoutfont = None
 882
 883         x =  self.pos[_POS_H] * self.conv
 884         y = -self.pos[_POS_V] * self.conv
 885         if self.debug:
 886             print "%d: xxx '%s'" % (self.filepos, s)
 887         if not s.startswith("PyX:"):
 888             if s.startswith("Warning:"):
 889                 sys.stderr.write("*** PyX Warning: ignoring special '%s'\n" % s)
 890                 return
 891             else:
 892                 raise RuntimeError("the special '%s' cannot be handled by PyX, aborting" % s)
 893         command, args = s[4:].split()[0], s[4:].split()[1:]
 894         if command=="color_begin":
 895             if args[0]=="cmyk":
 896                 c = color.cmyk(float(args[1]), float(args[2]), float(args[3]), float(args[4]))
 897             elif args[0]=="gray":
 898                 c = color.gray(float(args[1]))
 899             elif args[0]=="hsb":
 900                 c = color.hsb(float(args[1]), float(args[2]), float(args[3]))
 901             elif args[0]=="rgb":
 902                 c = color.rgb(float(args[1]), float(args[2]), float(args[3]))
 903             elif args[0]=="RGB":
 904                 c = color.rgb(int(args[1])/255.0, int(args[2])/255.0, int(args[3])/255.0)
 905             elif args[0]=="texnamed":
 906                 try:
 907                     c = getattr(color.cmyk, args[1])
 908                 except AttributeError:
 909                     raise RuntimeError("unknown TeX color '%s', aborting" % args[1])
 910             else:
 911                 raise RuntimeError("color model '%s' cannot be handled by PyX, aborting" % args[0])
 912             self.actpage.insert(_savecolor())
 913             self.actpage.insert(c)
 914         elif command=="color_end":
 915             self.actpage.insert(_restorecolor())
 916         elif command=="rotate_begin":
 917             self.actpage.insert(_savetrafo())
 918             self.actpage.insert(trafo._rotate(float(args[0]), x, y))
 919         elif command=="rotate_end":
 920             self.actpage.insert(_restoretrafo())
 921         elif command=="scale_begin":
 922             self.actpage.insert(_savetrafo())
 923             self.actpage.insert(trafo._scale(float(args[0]), float(args[1]), x, y))
 924         elif command=="scale_end":
 925             self.actpage.insert(_restoretrafo())
 926         elif command=="epsinclude":
 927             # parse arguments
 928             argdict = {}
 929             for arg in args:
 930                 name, value = arg.split("=")
 931                 argdict[name] = value
 932
 933             # construct kwargs for epsfile constructor
 934             epskwargs = {}
 935             epskwargs["filename"] = argdict["file"]
 936             epskwargs["bbox"] = bbox._bbox(float(argdict["llx"]), float(argdict["lly"]),
 937                                            float(argdict["urx"]), float(argdict["ury"]))
 938             if argdict.has_key("width"):
 939                 epskwargs["width"] = unit.t_pt(float(argdict["width"]))
 940             if argdict.has_key("height"):
 941                 epskwargs["height"] = unit.t_pt(float(argdict["height"]))
 942             if argdict.has_key("clip"):
 943                epskwargs["clip"] = int(argdict["clip"])
 944             self.actpage.insert(epsfile.epsfile(unit.t_pt(x), unit.t_pt(y), **epskwargs))
 945         elif command=="marker":
 946             if len(args) != 1:
 947                 raise RuntimeError("marker contains spaces")
 948             for c in args[0]:
 949                 if c not in string.digits + string.letters + "@":
 950                     raise RuntimeError("marker contains invalid characters")
 951             if self.actpage.markers.has_key(args[0]):
 952                 raise RuntimeError("marker name occurred several times")
 953             self.actpage.markers[args[0]] = unit.t_pt(x), unit.t_pt(y)
 954         else:
 955             raise RuntimeError("unknown PyX special '%s', aborting" % command)
 956
 957     # routines for pushing and popping different dvi chunks on the reader
 958
 959     def _push_dvistring(self, dvi, fonts, afterpos, fontsize):
 960         """ push dvi string with defined fonts on top of reader
 961         stack. Every positions gets scaled relatively by the factor
 962         scale. When finished with interpreting the dvi chunk, we
 963         continue with self.pos=afterpos. The designsize of the virtual
 964         font is passed as a fix_word
 965
 966         """
 967
 968         if self.debug:
 969             print "executing new dvi chunk"
 970         self.statestack.append((self.file, self.fonts, self.activefont, afterpos, self.stack, self.conv, self.tfmconv))
 971
 972         # units in vf files are relative to the size of the font and given as fix_words
 973         # which can be converted to floats by diving by 2**20
 974         oldconv = self.conv
 975         self.conv = fontsize/2**20
 976         rescale = self.conv/oldconv
 977
 978         self.file = stringbinfile(dvi)
 979         self.fonts = fonts
 980         self.stack = []
 981         self.filepos = 0
 982
 983         # we have to rescale self.pos in order to be consistent with the new scaling
 984         self.pos = map(lambda x, rescale=rescale:1.0*x/rescale, self.pos)
 985
 986         # since tfmconv converts from tfm units to dvi units, we have to rescale it as well
 987         self.tfmconv /= rescale
 988
 989         self.usefont(0)
 990
 991     def _pop_dvistring(self):
 992         self.flushout()
 993         if self.debug:
 994             print "finished executing dvi chunk"
 995         self.file.close()
 996         self.file, self.fonts, self.activefont, self.pos, self.stack, self.conv, self.tfmconv = self.statestack.pop()
 997
 998     # routines corresponding to the different reader states of the dvi maschine
 999
1000     def _read_pre(self):
1001         file = self.file
1002         while 1:
1003             self.filepos = file.tell()
1004             cmd = file.readuchar()
1005             if cmd == _DVI_NOP:
1006                 pass
1007             elif cmd == _DVI_PRE:
1008                 if self.file.readuchar() != _DVI_VERSION: raise DVIError
1009                 num = file.readuint32()
1010                 den = file.readuint32()
1011                 self.mag = file.readuint32()
1012
1013                 # for the interpretation of all quantities, two conversion factors
1014                 # are relevant:
1015                 # - self.tfmconv (tfm units->dvi units)
1016                 # - self.conv (dvi units-> (PostScript) points)
1017
1018                 self.tfmconv = (25400000.0/num)*(den/473628672.0)/16.0
1019
1020                 # calculate self.conv as described in the DVIType docu
1021
1022                 # resolution in dpi
1023                 self.resolution = 300.0
1024                 # self.trueconv = conv in DVIType docu
1025                 self.trueconv = (num/254000.0)*(self.resolution/den)
1026
1027                 # self.conv is the conversion factor from the dvi units
1028                 # to (PostScript) points. It consists of
1029                 # - self.mag/1000.0:   magstep scaling
1030                 # - self.trueconv:     conversion from dvi units to pixels
1031                 # - 1/self.resolution: conversion from pixels to inch
1032                 # - 72               : conversion from inch to points
1033                 self.conv = self.mag/1000.0*self.trueconv/self.resolution*72
1034
1035                 comment = file.read(file.readuchar())
1036                 return
1037             else:
1038                 raise DVIError
1039
1040     def readpage(self):
1041         """ reads a page from the dvi file
1042
1043         This routine reads a page from the dvi file which is
1044         returned as a canvas. When there is no page left in the
1045         dvifile, None is returned and the file is closed properly."""
1046
1047
1048         while 1:
1049             self.filepos = self.file.tell()
1050             cmd = self.file.readuchar()
1051             if cmd == _DVI_NOP:
1052                 pass
1053             elif cmd == _DVI_BOP:
1054                 self.flushout()
1055                 pagenos = [self.file.readuint32() for i in range(10)]
1056                 if pagenos[:3] != [ord("P"), ord("y"), ord("X")] or pagenos[4:] != [0, 0, 0, 0, 0, 0]:
1057                     raise DVIError("Page in dvi file is not a PyX page.")
1058                 if self.debug:
1059                     print "%d: beginning of page %i" % (self.filepos, pagenos[0])
1060                 self.file.readuint32()
1061                 break
1062             elif cmd == _DVI_POST:
1063                 self.file.close()
1064                 return None # nothing left
1065             else:
1066                 raise DVIError
1067
1068         actpage = canvas.canvas()
1069         self.actpage = actpage # XXX should be removed ...
1070         self.actpage.markers = {}
1071         self.pos = [0, 0, 0, 0, 0, 0]
1072         self.actoutfont = None
1073
1074         # Since we do not know, which dvi pages the actual PS file contains later on,
1075         # we have to keep track of used char informations separately for each dvi page.
1076         # In order to do so, the already defined fonts have to be copied and their
1077         # used char informations have to be reset
1078         for nr in self.fonts.keys():
1079             self.fonts[nr] = copy.copy(self.fonts[nr])
1080             self.fonts[nr].clearusedchars()
1081
1082         while 1:
1083             file = self.file
1084             self.filepos = file.tell()
1085             try:
1086                 cmd = file.readuchar()
1087             except struct.error:
1088                 # we most probably (if the dvi file is not corrupt) hit the end of a dvi chunk,
1089                 # so we have to continue with the rest of the dvi file
1090                 self._pop_dvistring()
1091                 continue
1092             if cmd == _DVI_NOP:
1093                 pass
1094             if cmd >= _DVI_CHARMIN and cmd <= _DVI_CHARMAX:
1095                 self.putchar(cmd)
1096             elif cmd >= _DVI_SET1234 and cmd < _DVI_SET1234 + 4:
1097                 self.putchar(file.readint(cmd - _DVI_SET1234 + 1))
1098             elif cmd == _DVI_SETRULE:
1099                 self.putrule(file.readint32(), file.readint32())
1100             elif cmd >= _DVI_PUT1234 and cmd < _DVI_PUT1234 + 4:
1101                 self.putchar(file.readint(cmd - _DVI_PUT1234 + 1), inch=0)
1102             elif cmd == _DVI_PUTRULE:
1103                 self.putrule(file.readint32(), file.readint32(), 0)
1104             elif cmd == _DVI_EOP:
1105                 self.flushout()
1106                 if self.debug:
1107                     print "%d: eop" % self.filepos
1108                     print
1109                 return actpage
1110             elif cmd == _DVI_PUSH:
1111                 self.stack.append(list(self.pos))
1112                 if self.debug:
1113                     print "%d: push" % self.filepos
1114                     print ("level %d:(h=%d,v=%d,w=%d,x=%d,y=%d,z=%d,hh=,vv=)" %
1115                            (( len(self.stack)-1,)+tuple(self.pos)))
1116             elif cmd == _DVI_POP:
1117                 self.flushout()
1118                 self.pos = self.stack.pop()
1119                 if self.debug:
1120                     print "%d: pop" % self.filepos
1121                     print ("level %d:(h=%d,v=%d,w=%d,x=%d,y=%d,z=%d,hh=,vv=)" %
1122                            (( len(self.stack),)+tuple(self.pos)))
1123             elif cmd >= _DVI_RIGHT1234 and cmd < _DVI_RIGHT1234 + 4:
1124                 self.flushout()
1125                 dh = file.readint(cmd - _DVI_RIGHT1234 + 1, 1)
1126                 if self.debug:
1127                     print ("%d: right%d %d h:=%d%+d=%d, hh:=" %
1128                            (self.filepos,
1129                             cmd - _DVI_RIGHT1234 + 1,
1130                             dh,
1131                             self.pos[_POS_H],
1132                             dh,
1133                             self.pos[_POS_H]+dh))
1134                 self.pos[_POS_H] += dh
1135             elif cmd == _DVI_W0:
1136                 self.flushout()
1137                 if self.debug:
1138                     print ("%d: w0 %d h:=%d%+d=%d, hh:=" %
1139                            (self.filepos,
1140                             self.pos[_POS_W],
1141                             self.pos[_POS_H],
1142                             self.pos[_POS_W],
1143                             self.pos[_POS_H]+self.pos[_POS_W]))
1144                 self.pos[_POS_H] += self.pos[_POS_W]
1145             elif cmd >= _DVI_W1234 and cmd < _DVI_W1234 + 4:
1146                 self.flushout()
1147                 self.pos[_POS_W] = file.readint(cmd - _DVI_W1234 + 1, 1)
1148                 if self.debug:
1149                     print ("%d: w%d %d h:=%d%+d=%d, hh:=" %
1150                            (self.filepos,
1151                             cmd - _DVI_W1234 + 1,
1152                             self.pos[_POS_W],
1153                             self.pos[_POS_H],
1154                             self.pos[_POS_W],
1155                             self.pos[_POS_H]+self.pos[_POS_W]))
1156                 self.pos[_POS_H] += self.pos[_POS_W]
1157             elif cmd == _DVI_X0:
1158                 self.flushout()
1159                 self.pos[_POS_H] += self.pos[_POS_X]
1160             elif cmd >= _DVI_X1234 and cmd < _DVI_X1234 + 4:
1161                 self.flushout()
1162                 self.pos[_POS_X] = file.readint(cmd - _DVI_X1234 + 1, 1)
1163                 self.pos[_POS_H] += self.pos[_POS_X]
1164             elif cmd >= _DVI_DOWN1234 and cmd < _DVI_DOWN1234 + 4:
1165                 self.flushout()
1166                 dv = file.readint(cmd - _DVI_DOWN1234 + 1, 1)
1167                 if self.debug:
1168                     print ("%d: down%d %d v:=%d%+d=%d, vv:=" %
1169                            (self.filepos,
1170                             cmd - _DVI_DOWN1234 + 1,
1171                             dv,
1172                             self.pos[_POS_V],
1173                             dv,
1174                             self.pos[_POS_V]+dv))
1175                 self.pos[_POS_V] += dv
1176             elif cmd == _DVI_Y0:
1177                 self.flushout()
1178                 if self.debug:
1179                     print ("%d: y0 %d v:=%d%+d=%d, vv:=" %
1180                            (self.filepos,
1181                             self.pos[_POS_Y],
1182                             self.pos[_POS_V],
1183                             self.pos[_POS_Y],
1184                             self.pos[_POS_V]+self.pos[_POS_Y]))
1185                 self.pos[_POS_V] += self.pos[_POS_Y]
1186             elif cmd >= _DVI_Y1234 and cmd < _DVI_Y1234 + 4:
1187                 self.flushout()
1188                 self.pos[_POS_Y] = file.readint(cmd - _DVI_Y1234 + 1, 1)
1189                 if self.debug:
1190                     print ("%d: y%d %d v:=%d%+d=%d, vv:=" %
1191                            (self.filepos,
1192                             cmd - _DVI_Y1234 + 1,
1193                             self.pos[_POS_Y],
1194                             self.pos[_POS_V],
1195                             self.pos[_POS_Y],
1196                             self.pos[_POS_V]+self.pos[_POS_Y]))
1197                 self.pos[_POS_V] += self.pos[_POS_Y]
1198             elif cmd == _DVI_Z0:
1199                 self.flushout()
1200                 self.pos[_POS_V] += self.pos[_POS_Z]
1201             elif cmd >= _DVI_Z1234 and cmd < _DVI_Z1234 + 4:
1202                 self.flushout()
1203                 self.pos[_POS_Z] = file.readint(cmd - _DVI_Z1234 + 1, 1)
1204                 self.pos[_POS_V] += self.pos[_POS_Z]
1205             elif cmd >= _DVI_FNTNUMMIN and cmd <= _DVI_FNTNUMMAX:
1206                 self.usefont(cmd - _DVI_FNTNUMMIN)
1207             elif cmd >= _DVI_FNT1234 and cmd < _DVI_FNT1234 + 4:
1208                 self.usefont(file.readint(cmd - _DVI_FNT1234 + 1, 1))
1209             elif cmd >= _DVI_SPECIAL1234 and cmd < _DVI_SPECIAL1234 + 4:
1210                 self.special(file.read(file.readint(cmd - _DVI_SPECIAL1234 + 1)))
1211             elif cmd >= _DVI_FNTDEF1234 and cmd < _DVI_FNTDEF1234 + 4:
1212                 if cmd == _DVI_FNTDEF1234:
1213                     num = file.readuchar()
1214                 elif cmd == _DVI_FNTDEF1234+1:
1215                     num = file.readuint16()
1216                 elif cmd == _DVI_FNTDEF1234+2:
1217                     num = file.readuint24()
1218                 elif cmd == _DVI_FNTDEF1234+3:
1219                     # Cool, here we have according to docu a signed int. Why?
1220                     num = file.readint32()
1221                 self.definefont(cmd-_DVI_FNTDEF1234+1,
1222                                 num,
1223                                 file.readint32(),
1224                                 file.readint32(),
1225                                 file.readint32(),
1226                                 file.read(file.readuchar()+file.readuchar()))
1227             else:
1228                 raise DVIError
1229
1230
1231 ##############################################################################
1232 # VF file handling
1233 ##############################################################################
1234
1235 _VF_LONG_CHAR  = 242              # character packet (long version)
1236 _VF_FNTDEF1234 = _DVI_FNTDEF1234  # font definition
1237 _VF_PRE        = _DVI_PRE         # preamble
1238 _VF_POST       = _DVI_POST        # postamble
1239
1240 _VF_ID         = 202              # VF id byte
1241
1242 class VFError(exceptions.Exception): pass
1243
1244 class vffile:
1245     def __init__(self, filename, scale, fontmap, debug=0):
1246         self.filename = filename
1247         self.scale = scale
1248         self.fontmap = fontmap
1249         self.debug = debug
1250         self.fonts = {}            # used fonts
1251         self.widths = {}           # widths of defined chars
1252         self.chardefs = {}         # dvi chunks for defined chars
1253
1254         file = binfile(self.filename, "rb")
1255
1256         cmd = file.readuchar()
1257         if cmd == _VF_PRE:
1258             if file.readuchar() != _VF_ID: raise VFError
1259             comment = file.read(file.readuchar())
1260             self.cs = file.readuint32()
1261             self.ds = file.readuint32()
1262         else:
1263             raise VFError
1264
1265         while 1:
1266             cmd = file.readuchar()
1267             if cmd >= _VF_FNTDEF1234 and cmd < _VF_FNTDEF1234 + 4:
1268                 # font definition
1269                 if cmd == _VF_FNTDEF1234:
1270                     num = file.readuchar()
1271                 elif cmd == _VF_FNTDEF1234+1:
1272                     num = file.readuint16()
1273                 elif cmd == _VF_FNTDEF1234+2:
1274                     num = file.readuint24()
1275                 elif cmd == _VF_FNTDEF1234+3:
1276                     num = file.readint32()
1277                 c = file.readint32()
1278                 s = file.readint32()     # relative scaling used for font (fix_word)
1279                 d = file.readint32()     # design size of font
1280                 fontname = file.read(file.readuchar()+file.readuchar())
1281
1282                 # rescaled size of font: s is relative to the scaling
1283                 # of the virtual font itself.  Note that realscale has
1284                 # to be a fix_word (like s)
1285                 # Furthermore we have to correct for self.tfmconv
1286
1287                 reals = int(self.scale * float(fix_word(self.ds))*s)
1288                 # print ("defining font %s -- VF scale: %g, VF design size: %g, relative font size: %g => real size: %g" %
1289                 #        (fontname, self.scale, fix_word(self.ds), fix_word(s), fix_word(reals))
1290                 #        )
1291                 # reald = int(d)
1292
1293                 # XXX allow for virtual fonts here too
1294                 self.fonts[num] =  type1font(fontname, c, reals, d, self.fontmap, self.debug > 1)
1295             elif cmd == _VF_LONG_CHAR:
1296                 # character packet (long form)
1297                 pl = file.readuint32()   # packet length
1298                 cc = file.readuint32()   # char code (assumed unsigned, but anyhow only 0 <= cc < 255 is actually used)
1299                 tfm = file.readuint24()  # character width
1300                 dvi = file.read(pl)      # dvi code of character
1301                 self.widths[cc] = tfm
1302                 self.chardefs[cc] = dvi
1303             elif cmd < _VF_LONG_CHAR:
1304                 # character packet (short form)
1305                 cc = file.readuchar()    # char code
1306                 tfm = file.readuint24()  # character width
1307                 dvi = file.read(cmd)
1308                 self.widths[cc] = tfm
1309                 self.chardefs[cc] = dvi
1310             elif cmd == _VF_POST:
1311                 break
1312             else:
1313                 raise VFError
1314
1315         file.close()
1316
1317     def getfonts(self):
1318         return self.fonts
1319
1320     def getchar(self, cc):
1321         return self.chardefs[cc]
1322
1323