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 # Copyright (C) 2007 Michael Schindler <m-schindler@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 bbox, canvas, pswriter, pdfwriter
  25
  26 try:
  27     enumerate([])
  28 except NameError:
  29     # fallback implementation for Python 2.2 and below
  30     def enumerate(list):
  31         return zip(xrange(len(list)), list)
  32
  33
  34 class encoding:
  35
  36     def __init__(self, name, filename):
  37         """ font encoding contained in filename """
  38         self.name = name
  39         self.filename = filename
  40
  41
  42 class encodingfile:
  43
  44     def __init__(self, name, filename):
  45         # XXX move the cursor to a module of its own
  46         from font.t1font import cursor
  47         self.name = name
  48         encfile = open(filename, "r")
  49         c = cursor(encfile.read(), "")
  50         encfile.close()
  51
  52         # name of encoding
  53         self.encname = c.gettoken()
  54         token = c.gettoken()
  55         if token != "[":
  56             raise RuntimeError("cannot parse encoding file '%s', expecting '[' got '%s'" % (filename, token))
  57         self.encvector = []
  58         for i in range(256):
  59             token = c.gettoken()
  60             if token == "]":
  61                 raise RuntimeError("not enough charcodes in encoding file '%s'" % filename)
  62             self.encvector.append(token)
  63         if c.gettoken() != "]":
  64             raise RuntimeError("too many charcodes in encoding file '%s'" % filename)
  65         token = c.gettoken()
  66         if token != "def":
  67             raise RuntimeError("cannot parse encoding file '%s', expecting 'def' got '%s'" % (filename, token))
  68
  69     def decode(self, charcode):
  70         return self.encvector[charcode]
  71
  72     def outputPS(self, file, writer):
  73         file.write("%%%%BeginProcSet: %s\n" % self.name)
  74         file.write("/%s\n"
  75                    "[" % self.name)
  76         for i, glyphname in enumerate(self.encvector):
  77             if i and not (i % 8):
  78                 file.write("\n")
  79             else:
  80                 file.write(" ")
  81             file.write(glyphname)
  82         file.write(" ] def\n"
  83                    "%%EndProcSet\n")
  84
  85     def outputPDF(self, file, writer):
  86         file.write("<<\n"
  87                    "/Type /Encoding\n"
  88                    "/Differences\n"
  89                    "[ 0")
  90         for i, glyphname in enumerate(self.encvector):
  91             if i and not (i % 8):
  92                 file.write("\n")
  93             else:
  94                 file.write(" ")
  95             file.write(glyphname)
  96         file.write(" ]\n"
  97                    ">>\n")
  98
  99
 100 class font:
 101
 102     def __init__(self, basefontname, filename, encoding, slant, metric):
 103         self.basefontname = basefontname
 104         self.filename = filename
 105         self.encoding = encoding
 106         self.slant = slant
 107         self.metric = metric
 108
 109         if encoding is None:
 110             self.name = basefontname
 111         else:
 112             self.name = "%s-%s" % (basefontname, encoding.name)
 113
 114         if slant is None:
 115             self.slant = 0.0
 116         else:
 117             self.name = "%s-slanted%f" % (self.name, self.slant)
 118
 119
 120 class text_pt(canvas.canvasitem):
 121
 122     def __init__(self, x_pt, y_pt, font):
 123         self.font = font
 124         self.x_pt = x_pt
 125         self.y_pt = y_pt
 126         self.width_pt = 0
 127         self.height_pt = 0
 128         self.depth_pt = 0
 129         self.chars = []
 130
 131     def addchar(self, char):
 132         metric = self.font.metric
 133         self.width_pt += metric.getwidth_pt(char)
 134         cheight_pt = metric.getwidth_pt(char)
 135         if cheight_pt > self.height_pt:
 136             self.height_pt = cheight_pt
 137         cdepth_pt = metric.getdepth_pt(char)
 138         if cdepth_pt > self.depth_pt:
 139             self.depth_pt = cdepth_pt
 140         self.chars.append(char)
 141
 142     def bbox(self):
 143         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)
 144
 145     def processPS(self, file, writer, context, registry, bbox):
 146         # note that we don't register PSfont as it is just a helper resource
 147         # which registers the needed components
 148         pswriter.PSfont(self.font, self.chars, registry)
 149         bbox += self.bbox()
 150
 151         if ( context.font is None or
 152              context.font.name != self.font.name or
 153              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 154             file.write("/%s %f selectfont\n" % (self.font.name, self.font.metric.getsize_pt()))
 155             context.font = self.font
 156         outstring = ""
 157         for char in self.chars:
 158             if char > 32 and char < 127 and chr(char) not in "()[]<>\\":
 159                 ascii = "%s" % chr(char)
 160             else:
 161                 ascii = "\\%03o" % char
 162             outstring += ascii
 163         file.write("%g %g moveto (%s) show\n" % (self.x_pt, self.y_pt, outstring))
 164
 165     def processPDF(self, file, writer, context, registry, bbox):
 166         registry.add(pdfwriter.PDFfont(self.font, self.chars, writer, registry))
 167         bbox += self.bbox()
 168
 169         if ( context.font is None or
 170              context.font.name != self.font.name or
 171              context.font.metric.getsize_pt() !=  self.font.metric.getsize_pt() ):
 172             file.write("/%s %f Tf\n" % (self.font.name, self.font.metric.getsize_pt()))
 173             context.font = self.font
 174         outstring = ""
 175         for char in self.chars:
 176             if 32 <= char <= 127 and chr(char) not in "()[]<>\\":
 177                 ascii = "%s" % chr(char)
 178             else:
 179                 ascii = "\\%03o" % char
 180             outstring += ascii
 181         file.write("1 0 %f 1 %f %f Tm (%s) Tj\n" % (self.font.slant, self.x_pt, self.y_pt, outstring))
 182