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
  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 text_pt(canvas.canvasitem):
 164
 165     def __init__(self, x_pt, y_pt, font):
 166         self.font = font
 167         self.x_pt = x_pt
 168         self.y_pt = y_pt
 169         self.width_pt = 0
 170         self.height_pt = 0
 171         self.depth_pt = 0
 172         self.chars = []
 173
 174     def addchar(self, char):
 175         metric = self.font.metric
 176         self.width_pt += metric.getwidth_pt(char)
 177         cheight_pt = metric.getwidth_pt(char)
 178         if cheight_pt > self.height_pt:
 179             self.height_pt = cheight_pt
 180         cdepth_pt = metric.getdepth_pt(char)
 181         if cdepth_pt > self.depth_pt:
 182             self.depth_pt = cdepth_pt
 183         self.chars.append(char)
 184
 185     def bbox(self):
 186         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)
 187
 188     def registerPS(self, registry):
 189         # note that we don't register PSfont as it is just a helper resource
 190         # which registers the needed components
 191         pswriter.PSfont(self.font, self.chars, registry)
 192
 193     def registerPDF(self, registry):
 194         registry.add(pdfwriter.PDFfont(self.font, self.chars, registry))
 195
 196     def outputPS(self, file, writer, context):
 197         if ( context.font is None or
 198              context.font.name != self.font.name or
 199              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 200             file.write("/%s %f selectfont\n" % (self.font.name, self.font.metric.getsize_pt()))
 201             context.font = self.font
 202         outstring = ""
 203         for char in self.chars:
 204             if char > 32 and char < 127 and chr(char) not in "()[]<>\\":
 205                 ascii = "%s" % chr(char)
 206             else:
 207                 ascii = "\\%03o" % char
 208             outstring += ascii
 209         file.write("%g %g moveto (%s) show\n" % (self.x_pt, self.y_pt, outstring))
 210
 211
 212     def outputPDF(self, file, writer, context):
 213         if ( context.font is None or
 214              context.font.name != self.font.name or
 215              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 216             file.write("/%s %f Tf\n" % (self.font.name, self.font.metric.getsize_pt()))
 217             context.font = self.font
 218         outstring = ""
 219         for char in self.chars:
 220             if 32 <= char <= 127 and chr(char) not in "()[]<>\\":
 221                 ascii = "%s" % chr(char)
 222             else:
 223                 ascii = "\\%03o" % char
 224             outstring += ascii
 225         file.write("1 0 0 1 %f %f Tm (%s) Tj\n" % (self.x_pt, self.y_pt, outstring))
 226