pyx/type1font.py

   1 #!/usr/bin/env python
   2 # -*- coding: ISO-8859-1 -*-
   3 #
   4 #
   5 # Copyright (C) 2005 Jörg Lehmann <joergl@users.sourceforge.net>
   6 # Copyright (C) 2005 André Wobst <wobsta@users.sourceforge.net>
   7 #
   8 # This file is part of PyX (http://pyx.sourceforge.net/).
   9 #
  10 # PyX is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # PyX is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with PyX; if not, write to the Free Software
  22 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  23
  24 import re, tempfile, os, binascii
  25 try:
  26     import zlib
  27 except:
  28     pass
  29 import bbox, canvas, pswriter, pdfwriter, t1strip
  30
  31 try:
  32     enumerate([])
  33 except NameError:
  34     # fallback implementation for Python 2.2 and below
  35     def enumerate(list):
  36         return zip(xrange(len(list)), list)
  37
  38
  39 # _PFB_ASCII = "\200\1"
  40 # _PFB_BIN = "\200\2"
  41 # _PFB_DONE = "\200\3"
  42 # _PFA = "%!"
  43
  44 _StandardEncodingMatch = re.compile(r"\b/Encoding\s+StandardEncoding\s+def\b")
  45 #_FontBBoxMatch = re.compile(r"\bFontBBox\s*\{\s*(-?\d+)\s+(-?\d+)\s+(-?\d+)\s+(-?\d+)\s*\}\s*readonly\s+def\b")
  46 #_ItalicAngle = re.compile(r"\bItalicAngle\s+(-?\d+)\b")
  47
  48
  49 def _pfblength(s):
  50     if len(s) != 4:
  51         raise ValueError("invalid string length")
  52     return (ord(s[0]) +
  53             ord(s[1])*256 +
  54             ord(s[2])*256*256 +
  55             ord(s[3])*256*256*256)
  56
  57 class _tokenfile:
  58     """ ascii file containing tokens separated by spaces.
  59
  60     Comments beginning with % are ignored. Strings containing spaces
  61     are not handled correctly
  62     """
  63
  64     def __init__(self, filename):
  65         self.file = open(filename, "r")
  66         self.line = None
  67
  68     def gettoken(self):
  69         """ return next token or None if EOF """
  70         while not self.line:
  71             line = self.file.readline()
  72             if line == "":
  73                 return None
  74             self.line = line.split("%")[0].split()
  75         token = self.line[0]
  76         self.line = self.line[1:]
  77         return token
  78
  79     def close(self):
  80         self.file.close()
  81
  82
  83 class encoding:
  84
  85     def __init__(self, name, filename):
  86         """ font encoding contained in filename """
  87         self.name = name
  88         self.filename = filename
  89
  90
  91 class encodingfile:
  92
  93     def __init__(self, name, filename):
  94         self.name = name
  95         encfile = _tokenfile(filename)
  96
  97         # name of encoding
  98         self.encname = encfile.gettoken()
  99         token = encfile.gettoken()
 100         if token != "[":
 101             raise RuntimeError("cannot parse encoding file '%s', expecting '[' got '%s'" % (filename, token))
 102         self.encvector = []
 103         for i in range(256):
 104             token = encfile.gettoken()
 105             if token is None or token=="]":
 106                 raise RuntimeError("not enough charcodes in encoding file '%s'" % filename)
 107             self.encvector.append(token)
 108         if encfile.gettoken() != "]":
 109             raise RuntimeError("too many charcodes in encoding file '%s'" % filename)
 110         token = encfile.gettoken()
 111         if token != "def":
 112             raise RuntimeError("cannot parse encoding file '%s', expecting 'def' got '%s'" % (filename, token))
 113         token = encfile.gettoken()
 114         if token != None:
 115             raise RuntimeError("encoding file '%s' too long" % filename)
 116         encfile.close()
 117
 118 #    def decode(self, charcode):
 119 #        return self.encvector[charcode]
 120
 121     def outputPS(self, file, writer, registry):
 122         file.write("%%%%BeginProcSet: %s\n" % self.name)
 123         file.write("/%s\n"
 124                    "[" % self.name)
 125         for i, glyphname in enumerate(self.encvector):
 126             if i and not (i % 8):
 127                 file.write("\n")
 128             else:
 129                 file.write(" ")
 130             file.write(glyphname)
 131         file.write(" ] def\n"
 132                    "%%EndProcSet\n")
 133
 134     def outputPDF(self, file, writer, registry):
 135         file.write("<<\n"
 136                    "/Type /Encoding\n"
 137                    "/Differences\n"
 138                    "[ 0")
 139         for i, glyphname in enumerate(self.encvector):
 140             if i and not (i % 8):
 141                 file.write("\n")
 142             else:
 143                 file.write(" ")
 144             file.write(glyphname)
 145         file.write(" ]\n"
 146                    ">>\n")
 147
 148
 149 class font:
 150
 151     def __init__(self, basefontname, filename, encoding, metric):
 152         self.basefontname = basefontname
 153         self.filename = filename
 154         self.encoding = encoding
 155         self.metric = metric
 156
 157         if encoding is None:
 158             self.name = basefontname
 159         else:
 160             self.name = "%s-%s" % (basefontname, encoding.name)
 161
 162
 163 class fontfile:
 164
 165     # TODO: own stripping using glyph names instead of char codes; completely remove encoding
 166
 167     def __init__(self, fontname, fontfilename, usedchars, encodingfilename):
 168         self.fontname = fontname
 169         self.fontfilename = fontfilename
 170         self.usedchars = [0]*256
 171         for charcode in usedchars.keys():
 172             self.usedchars[charcode] = 1
 173         self.encodingfilename = encodingfilename
 174
 175     def getflags(self):
 176         # As a simple heuristics we assume non-symbolic fonts if and only
 177         # if the Adobe standard encoding is used. All other font flags are
 178         # not specified here.
 179         fontfile = open(self.fontfilename, "rb")
 180         fontdata = fontfile.read()
 181         fontfile.close()
 182         if _StandardEncodingMatch.search(fontdata):
 183             return 32
 184         return 4
 185
 186     def outputPS(self, file, writer, registry):
 187         file.write("%%%%BeginFont: %s\n" % self.fontname)
 188         file.write("%Included char codes:")
 189         for i in range(len(self.usedchars)):
 190             if self.usedchars[i]:
 191                 file.write(" %d" % i)
 192         file.write("\n")
 193         if self.encodingfilename is not None:
 194             t1strip.t1strip(file, self.fontfilename, self.usedchars, self.encodingfilename)
 195         else:
 196             t1strip.t1strip(file, self.fontfilename, self.usedchars)
 197         file.write("%%EndFont\n")
 198
 199     def outputPDF(self, file, writer, registry):
 200         strippedfontfilename = tempfile.mktemp()
 201         strippedfontfile = open(strippedfontfilename, "w")
 202         if self.usedchars:
 203             if self.encodingfilename is not None:
 204                 t1strip.t1strip(strippedfontfile, self.fontfilename, self.usedchars, self.encodingfilename)
 205             else:
 206                 t1strip.t1strip(strippedfontfile, self.fontfilename, self.usedchars)
 207         strippedfontfile.close()
 208         strippedfontfile = open(strippedfontfilename, "r")
 209         fontdata = strippedfontfile.read()
 210         strippedfontfile.close()
 211         os.unlink(strippedfontfilename)
 212
 213         # split the font into its three parts
 214         length1 = fontdata.index("currentfile eexec") + 18
 215         length2 = fontdata.index("0"*20)
 216         fontdata1 = fontdata[:length1]
 217         fontdata2 = fontdata[length1:length2]
 218         fontdata3 = fontdata[length2:]
 219         length3 = len(fontdata3)
 220
 221         # convert to pfa
 222         fontdata2 = binascii.a2b_hex(fontdata2.replace(" ", "").replace("\r", "").replace("\n", "").replace("\t", ""))
 223         length2 = len(fontdata2)
 224
 225         # we might be allowed to skip the third part ...
 226         if (fontdata3.replace("\n", "")
 227                      .replace("\r", "")
 228                      .replace("\t", "")
 229                      .replace(" ", "")) == "0"*512 + "cleartomark":
 230             length3 = 0
 231             fontdata3 = ""
 232
 233         data = fontdata1 + fontdata2 + fontdata3
 234         if writer.compress:
 235             data = zlib.compress(fontdata1 + fontdata2 + fontdata3)
 236
 237         file.write("<<\n"
 238                    "/Length %d\n"
 239                    "/Length1 %d\n"
 240                    "/Length2 %d\n"
 241                    "/Length3 %d\n" % (len(data), length1, length2, length3))
 242         if writer.compress:
 243             file.write("/Filter /FlateDecode\n")
 244         file.write(">>\n"
 245                    "stream\n")
 246         file.write(data)
 247         file.write("\n"
 248                    "endstream\n")
 249
 250
 251 class text_pt(canvas.canvasitem):
 252
 253     def __init__(self, x_pt, y_pt, font):
 254         self.font = font
 255         self.x_pt = x_pt
 256         self.y_pt = y_pt
 257         self.width_pt = 0
 258         self.height_pt = 0
 259         self.depth_pt = 0
 260         self.chars = []
 261
 262     def addchar(self, char):
 263         metric = self.font.metric
 264         self.width_pt += metric.getwidth_pt(char)
 265         cheight_pt = metric.getwidth_pt(char)
 266         if cheight_pt > self.height_pt:
 267             self.height_pt = cheight_pt
 268         cdepth_pt = metric.getdepth_pt(char)
 269         if cdepth_pt > self.depth_pt:
 270             self.depth_pt = cdepth_pt
 271         self.chars.append(char)
 272
 273     def bbox(self):
 274         return bbox.bbox_pt(self.x_pt, self.y_pt-self.depth_pt, self.x_pt+self.width_pt, self.y_pt+self.height_pt)
 275
 276     def registerPS(self, registry):
 277         # note that we don't register PSfont as it is just a helper resource
 278         # which registers the needed components
 279         pswriter.PSfont(self.font, self.chars, registry)
 280
 281     def registerPDF(self, registry):
 282         registry.add(pdfwriter.PDFfont(self.font, self.chars, registry))
 283
 284     def outputPS(self, file, writer, context):
 285         if ( context.font is None or
 286              context.font.name != self.font.name or
 287              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 288             file.write("/%s %f selectfont\n" % (self.font.name, self.font.metric.getsize_pt()))
 289             context.font = self.font
 290         outstring = ""
 291         for char in self.chars:
 292             if char > 32 and char < 127 and chr(char) not in "()[]<>\\":
 293                 ascii = "%s" % chr(char)
 294             else:
 295                 ascii = "\\%03o" % char
 296             outstring += ascii
 297         file.write("%g %g moveto (%s) show\n" % (self.x_pt, self.y_pt, outstring))
 298
 299
 300     def outputPDF(self, file, writer, context):
 301         if ( context.font is None or
 302              context.font.name != self.font.name or
 303              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 304             file.write("/%s %f Tf\n" % (self.font.name, self.font.metric.getsize_pt()))
 305             context.font = self.font
 306         outstring = ""
 307         for char in self.chars:
 308             if 32 <= char <= 127 and chr(char) not in "()[]<>\\":
 309                 ascii = "%s" % chr(char)
 310             else:
 311                 ascii = "\\%03o" % char
 312             outstring += ascii
 313         file.write("1 0 0 1 %f %f Tm (%s) Tj\n" % (self.x_pt, self.y_pt, outstring))
 314