tools/compile-unifont.py

   1 #  -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
   2 #
   3 #  This file is part of systemd.
   4 #
   5 #  Copyright 2013-2014 David Herrmann <dh.herrmann@gmail.com>
   6 #
   7 #  systemd is free software; you can redistribute it and/or modify it
   8 #  under the terms of the GNU Lesser General Public License as published by
   9 #  the Free Software Foundation; either version 2.1 of the License, or
  10 #  (at your option) any later version.
  11 #
  12 #  systemd is distributed in the hope that it will be useful, but
  13 #  WITHOUT ANY WARRANTY; without even the implied warranty of
  14 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15 #  Lesser General Public License for more details.
  16 #
  17 #  You should have received a copy of the GNU Lesser General Public License
  18 #  along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19
  20 #
  21 # Parse a unifont.hex file and produce a compressed binary-format.
  22 #
  23
  24 from __future__ import print_function
  25 import re
  26 import sys
  27 import fileinput
  28 import struct
  29
  30 #
  31 # Write "bits" array as binary output.
  32 #
  33
  34 def write_bin_entry(entry):
  35     l = len(entry)
  36     if l != 32 and l != 64:
  37         entry = "0" * 64
  38         l = 0
  39     elif l < 64:
  40         entry += "0" * (64 - l)
  41
  42     sys.stdout.buffer.write(struct.pack('B', int(l / 32)))  # width
  43     sys.stdout.buffer.write(struct.pack('B', 0))            # padding
  44     sys.stdout.buffer.write(struct.pack('H', 0))            # padding
  45     sys.stdout.buffer.write(struct.pack('I', 0))            # padding
  46
  47     i = 0
  48     for j in range(0, 16):
  49         for k in range(0, 2):
  50             if l <= k * 16 * 2:
  51                 c = 0
  52             else:
  53                 c = int(entry[i:i+2], 16)
  54                 i += 2
  55
  56             sys.stdout.buffer.write(struct.pack('B', c))
  57
  58 def write_bin(bits):
  59     sys.stdout.buffer.write(struct.pack('B', 0x44))         # ASCII: 'D'
  60     sys.stdout.buffer.write(struct.pack('B', 0x56))         # ASCII: 'V'
  61     sys.stdout.buffer.write(struct.pack('B', 0x44))         # ASCII: 'D'
  62     sys.stdout.buffer.write(struct.pack('B', 0x48))         # ASCII: 'H'
  63     sys.stdout.buffer.write(struct.pack('B', 0x52))         # ASCII: 'R'
  64     sys.stdout.buffer.write(struct.pack('B', 0x4d))         # ASCII: 'M'
  65     sys.stdout.buffer.write(struct.pack('B', 0x55))         # ASCII: 'U'
  66     sys.stdout.buffer.write(struct.pack('B', 0x46))         # ASCII: 'F'
  67     sys.stdout.buffer.write(struct.pack('<I', 0))           # compatible-flags
  68     sys.stdout.buffer.write(struct.pack('<I', 0))           # incompatible-flags
  69     sys.stdout.buffer.write(struct.pack('<I', 32))          # header-size
  70     sys.stdout.buffer.write(struct.pack('<H', 8))           # glyph-header-size
  71     sys.stdout.buffer.write(struct.pack('<H', 2))           # glyph-stride
  72     sys.stdout.buffer.write(struct.pack('<Q', 32))          # glyph-body-size
  73
  74     # write glyphs
  75     for idx in range(len(bits)):
  76         write_bin_entry(bits[idx])
  77
  78 #
  79 # Parse hex file into "bits" array
  80 #
  81
  82 def parse_hex_line(bits, line):
  83     m = re.match(r"^([0-9A-Fa-f]+):([0-9A-Fa-f]+)$", line)
  84     if m == None:
  85         return
  86
  87     idx = int(m.group(1), 16)
  88     val = m.group(2)
  89
  90     # insert skipped lines
  91     for i in range(len(bits), idx):
  92         bits.append("")
  93
  94     bits.insert(idx, val)
  95
  96 def parse_hex():
  97     bits = []
  98
  99     for line in sys.stdin:
 100         if not line:
 101             continue
 102         if line.startswith("#"):
 103             continue
 104
 105         parse_hex_line(bits, line)
 106
 107     return bits
 108
 109 #
 110 # In normal mode we simply read line by line from standard-input and write the
 111 # binary-file to standard-output.
 112 #
 113
 114 if __name__ == "__main__":
 115     bits = parse_hex()
 116     write_bin(bits)