pyx/dvi/tfmfile.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2007-2011 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2007-2011 André Wobst <wobsta@users.sourceforge.net>
   6 #
   7 # This file is part of PyX (http://pyx.sourceforge.net/).
   8 #
   9 # PyX is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # PyX is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with PyX; if not, write to the Free Software
  21 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  22
  23
  24 from pyx import reader
  25
  26 class char_info_word:
  27
  28     def __init__(self, word):
  29         self.width_index  = int((word & 0xFF000000L) >> 24) #make sign-safe
  30         self.height_index = (word & 0x00F00000) >> 20
  31         self.depth_index  = (word & 0x000F0000) >> 16
  32         self.italic_index = (word & 0x0000FC00) >> 10
  33         self.tag          = (word & 0x00000300) >> 8
  34         self.remainder    = (word & 0x000000FF)
  35
  36
  37 class TFMfile:
  38
  39     def __init__(self, file, debug=0):
  40         self.file = reader.stringreader(file.read())
  41
  42         #
  43         # read pre header
  44         #
  45
  46         self.lf = self.file.readint16()
  47         self.lh = self.file.readint16()
  48         self.bc = self.file.readint16()
  49         self.ec = self.file.readint16()
  50         self.nw = self.file.readint16()
  51         self.nh = self.file.readint16()
  52         self.nd = self.file.readint16()
  53         self.ni = self.file.readint16()
  54         self.nl = self.file.readint16()
  55         self.nk = self.file.readint16()
  56         self.ne = self.file.readint16()
  57         self.np = self.file.readint16()
  58
  59         if not (self.bc-1 <= self.ec <= 255 and
  60                 self.ne <= 256 and
  61                 self.lf == 6+self.lh+(self.ec-self.bc+1)+self.nw+self.nh+self.nd
  62                 +self.ni+self.nl+self.nk+self.ne+self.np):
  63             raise RuntimeError("error in TFM pre-header")
  64
  65         if debug:
  66             print "lh=%d" % self.lh
  67
  68         #
  69         # read header
  70         #
  71
  72         self.checksum = self.file.readint32()
  73         self.designsize = self.file.readint32()
  74         assert self.designsize > 0, "invald design size"
  75         if self.lh > 2:
  76             assert self.lh > 11, "inconsistency in TFM file: incomplete field"
  77             self.charcoding = self.file.readstring(40)
  78         else:
  79             self.charcoding = None
  80
  81         if self.lh > 12:
  82             assert self.lh > 16, "inconsistency in TFM file: incomplete field"
  83             self.fontfamily = self.file.readstring(20)
  84         else:
  85             self.fontfamily = None
  86
  87         if debug:
  88             print "(FAMILY %s)" % self.fontfamily
  89             print "(CODINGSCHEME %s)" % self.charcoding
  90             print "(DESINGSIZE R %f)" % (16.0*self.designsize/16777216L)
  91
  92         if self.lh > 17:
  93             self.sevenbitsave = self.file.readuchar()
  94             # ignore the following two bytes
  95             self.file.readint16()
  96             facechar = self.file.readuchar()
  97             # decode ugly face specification into the Knuth suggested string
  98             if facechar < 18:
  99                 if facechar >= 12:
 100                     self.face = "E"
 101                     facechar -= 12
 102                 elif facechar >= 6:
 103                     self.face = "C"
 104                     facechar -= 6
 105                 else:
 106                     self.face = "R"
 107
 108                 if facechar >= 4:
 109                     self.face = "L" + self.face
 110                     facechar -= 4
 111                 elif facechar >= 2:
 112                     self.face = "B" + self.face
 113                     facechar -= 2
 114                 else:
 115                     self.face = "M" + self.face
 116
 117                 if facechar == 1:
 118                     self.face = self.face[0] + "I" + self.face[1]
 119                 else:
 120                     self.face = self.face[0] + "R" + self.face[1]
 121
 122             else:
 123                 self.face = None
 124         else:
 125             self.sevenbitsave = self.face = None
 126
 127         if self.lh > 18:
 128             # just ignore the rest
 129             print self.file.read((self.lh-18)*4)
 130
 131         #
 132         # read char_info
 133         #
 134
 135         self.char_info = [None]*(self.ec+1)
 136         for charcode in range(self.bc, self.ec+1):
 137             self.char_info[charcode] = char_info_word(self.file.readint32())
 138             if self.char_info[charcode].width_index == 0:
 139                 # disable character if width_index is zero
 140                 self.char_info[charcode] = None
 141
 142         #
 143         # read widths
 144         #
 145
 146         self.width = [None for width_index in range(self.nw)]
 147         for width_index in range(self.nw):
 148             self.width[width_index] = self.file.readint32()
 149
 150         #
 151         # read heights
 152         #
 153
 154         self.height = [None for height_index in range(self.nh)]
 155         for height_index in range(self.nh):
 156             self.height[height_index] = self.file.readint32()
 157
 158         #
 159         # read depths
 160         #
 161
 162         self.depth = [None for depth_index in range(self.nd)]
 163         for depth_index in range(self.nd):
 164             self.depth[depth_index] = self.file.readint32()
 165
 166         #
 167         # read italic
 168         #
 169
 170         self.italic = [None for italic_index in range(self.ni)]
 171         for italic_index in range(self.ni):
 172             self.italic[italic_index] = self.file.readint32()
 173
 174         #
 175         # read lig_kern
 176         #
 177
 178         # XXX decode to lig_kern_command
 179
 180         self.lig_kern = [None for lig_kern_index in range(self.nl)]
 181         for lig_kern_index in range(self.nl):
 182             self.lig_kern[lig_kern_index] = self.file.readint32()
 183
 184         #
 185         # read kern
 186         #
 187
 188         self.kern = [None for kern_index in range(self.nk)]
 189         for kern_index in range(self.nk):
 190             self.kern[kern_index] = self.file.readint32()
 191
 192         #
 193         # read exten
 194         #
 195
 196         # XXX decode to extensible_recipe
 197
 198         self.exten = [None for exten_index in range(self.ne)]
 199         for exten_index in range(self.ne):
 200             self.exten[exten_index] = self.file.readint32()
 201
 202         #
 203         # read param
 204         #
 205
 206         # XXX decode
 207
 208         self.param = [None for param_index in range(self.np)]
 209         for param_index in range(self.np):
 210             self.param[param_index] = self.file.readint32()
 211
 212         self.file.close()