pyx/type1font.py

   1 # -*- coding: ISO-8859-1 -*-
   2 #
   3 #
   4 # Copyright (C) 2005-2006 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2005-2006 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 import bbox, canvas, pswriter, pdfwriter
  24
  25 try:
  26     enumerate([])
  27 except NameError:
  28     # fallback implementation for Python 2.2 and below
  29     def enumerate(list):
  30         return zip(xrange(len(list)), list)
  31
  32
  33 class encoding:
  34
  35     def __init__(self, name, filename):
  36         """ font encoding contained in filename """
  37         self.name = name
  38         self.filename = filename
  39
  40
  41 class encodingfile:
  42
  43     def __init__(self, name, filename):
  44         # XXX move the cursor to a module of its own
  45         from font.t1font import cursor
  46         self.name = name
  47         encfile = open(filename, "r")
  48         c = cursor(encfile.read(), "")
  49         encfile.close()
  50
  51         # name of encoding
  52         self.encname = c.gettoken()
  53         token = c.gettoken()
  54         if token != "[":
  55             raise RuntimeError("cannot parse encoding file '%s', expecting '[' got '%s'" % (filename, token))
  56         self.encvector = []
  57         for i in range(256):
  58             token = c.gettoken()
  59             if token == "]":
  60                 raise RuntimeError("not enough charcodes in encoding file '%s'" % filename)
  61             self.encvector.append(token)
  62         if c.gettoken() != "]":
  63             raise RuntimeError("too many charcodes in encoding file '%s'" % filename)
  64         token = c.gettoken()
  65         if token != "def":
  66             raise RuntimeError("cannot parse encoding file '%s', expecting 'def' got '%s'" % (filename, token))
  67
  68     def decode(self, charcode):
  69         return self.encvector[charcode]
  70
  71     def outputPS(self, file, writer):
  72         file.write("%%%%BeginProcSet: %s\n" % self.name)
  73         file.write("/%s\n"
  74                    "[" % self.name)
  75         for i, glyphname in enumerate(self.encvector):
  76             if i and not (i % 8):
  77                 file.write("\n")
  78             else:
  79                 file.write(" ")
  80             file.write(glyphname)
  81         file.write(" ] def\n"
  82                    "%%EndProcSet\n")
  83
  84     def outputPDF(self, file, writer):
  85         file.write("<<\n"
  86                    "/Type /Encoding\n"
  87                    "/Differences\n"
  88                    "[ 0")
  89         for i, glyphname in enumerate(self.encvector):
  90             if i and not (i % 8):
  91                 file.write("\n")
  92             else:
  93                 file.write(" ")
  94             file.write(glyphname)
  95         file.write(" ]\n"
  96                    ">>\n")
  97
  98
  99 class font:
 100
 101     def __init__(self, basefontname, filename, encoding, metric):
 102         self.basefontname = basefontname
 103         self.filename = filename
 104         self.encoding = encoding
 105         self.metric = metric
 106
 107         if encoding is None:
 108             self.name = basefontname
 109         else:
 110             self.name = "%s-%s" % (basefontname, encoding.name)
 111
 112
 113 class text_pt(canvas.canvasitem):
 114
 115     def __init__(self, x_pt, y_pt, font):
 116         self.font = font
 117         self.x_pt = x_pt
 118         self.y_pt = y_pt
 119         self.width_pt = 0
 120         self.height_pt = 0
 121         self.depth_pt = 0
 122         self.chars = []
 123
 124     def addchar(self, char):
 125         metric = self.font.metric
 126         self.width_pt += metric.getwidth_pt(char)
 127         cheight_pt = metric.getwidth_pt(char)
 128         if cheight_pt > self.height_pt:
 129             self.height_pt = cheight_pt
 130         cdepth_pt = metric.getdepth_pt(char)
 131         if cdepth_pt > self.depth_pt:
 132             self.depth_pt = cdepth_pt
 133         self.chars.append(char)
 134
 135     def bbox(self):
 136         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)
 137
 138     def processPS(self, file, writer, context, registry, bbox):
 139         # note that we don't register PSfont as it is just a helper resource
 140         # which registers the needed components
 141         pswriter.PSfont(self.font, self.chars, registry)
 142         bbox += self.bbox()
 143
 144         if ( context.font is None or
 145              context.font.name != self.font.name or
 146              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 147             file.write("/%s %f selectfont\n" % (self.font.name, self.font.metric.getsize_pt()))
 148             context.font = self.font
 149         outstring = ""
 150         for char in self.chars:
 151             if char > 32 and char < 127 and chr(char) not in "()[]<>\\":
 152                 ascii = "%s" % chr(char)
 153             else:
 154                 ascii = "\\%03o" % char
 155             outstring += ascii
 156         file.write("%g %g moveto (%s) show\n" % (self.x_pt, self.y_pt, outstring))
 157
 158     def processPDF(self, file, writer, context, registry, bbox):
 159         registry.add(pdfwriter.PDFfont(self.font, self.chars, writer, registry))
 160         bbox += self.bbox()
 161
 162         if ( context.font is None or
 163              context.font.name != self.font.name or
 164              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 165             file.write("/%s %f Tf\n" % (self.font.name, self.font.metric.getsize_pt()))
 166             context.font = self.font
 167         outstring = ""
 168         for char in self.chars:
 169             if 32 <= char <= 127 and chr(char) not in "()[]<>\\":
 170                 ascii = "%s" % chr(char)
 171             else:
 172                 ascii = "\\%03o" % char
 173             outstring += ascii
 174         file.write("1 0 0 1 %f %f Tm (%s) Tj\n" % (self.x_pt, self.y_pt, outstring))
 175