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# this file is part of mftrace - a tool to generate scalable fonts from bitmaps
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# Copyright (c) 2001--2006 by
# Han-Wen Nienhuys, Jan Nieuwenhuizen
import sys
def compose_tfm_number (seq):
shift = (len (seq)-1)*8
cs = 0
for b in seq:
cs = cs + (int (b) << shift)
shift = shift - 8
return cs
#
#
# Read params, ligatures, kernings.
#
#
class Tfm_reader:
def get_string (self):
b = self.left[0]
s = (self.left[1:1 + b]).decode('ascii')
self.left = self.left[1+b:]
return s
def get_byte (self):
b = self.left [0]
self.left= self.left[1:]
return b
def extract_fixps (self, count):
fs = [0.0] * count
for c in range (0,count):
fs[c] = self.get_fixp_number ()
return fs
def extract_chars (self):
count = self.end_code - self.start_code + 1
fs = [None] * count
for c in range (0,count):
w = self.get_byte()
b = self.get_byte()
h = (b & 0xf0) >> 4
d = (b & 0x0f)
b = self.get_byte ()
i = (b & 0xfc) >> 2
tag = (b & 0x3)
rem = self.get_byte ()
# rem is used as index for the ligature table.
# TODO.
lig = None
fs[c] = (w, h, d, i, lig)
return fs
def get_ligatures(self):
return None
def get_kern_program (self):
return None
def __init__ (self, f):
self.left = f
self.file_length = self.get_number (2);
self.head_length = self.get_number (2);
self.start_code = self.get_number (2);
self.end_code = self.get_number (2);
self.width_count = self.get_number (2);
self.height_count =self.get_number(2);
self.depth_count = self.get_number (2);
self.italic_corr_count = self.get_number(2);
self.ligature_kern_count = self.get_number (2);
self.kern_count = self.get_number (2)
self.extensible_word_count =self.get_number (2);
self.parameter_count =self.get_number (2);
self.checksum = self.get_number (4)
self.design_size = self.get_fixp_number ()
if self.head_length > 2:
self.coding = self.get_string ()
else:
self.coding = 'UNKNOWN'
self.left =f[(6 + self.head_length) * 4:]
self.chars = self.extract_chars ()
self.widths = self.extract_fixps (self.width_count)
self.heights = self.extract_fixps (self.height_count)
self.depths = self.extract_fixps (self.depth_count)
self.italic_corrections = self.extract_fixps (self.italic_corr_count)
self.ligatures = self.get_ligatures ()
self.kern_program = self.get_kern_program()
del self.left
def get_number (self, len):
n = compose_tfm_number (self.left [0:len])
self.left = self.left[len:]
return n
def get_fixp_number (self):
n = self.get_number (4)
n = n /16.0 / (1<<16);
return n
def get_tfm (self):
keys = ['start_code', 'end_code', 'checksum', 'design_size', 'coding', 'chars', 'widths', 'heights', 'depths', 'italic_corrections', 'ligatures', 'kern_program']
tfm = Tex_font_metric ()
for k in keys:
tfm.__dict__[k] = self.__dict__[k]
return tfm
class Char_metric:
def __init__(self, tfm, tup):
(w, h, d, i, lig) = tup
ds = tfm.design_size
self.width = tfm.widths[w] *ds
self.height = tfm.heights[h] *ds
self.depth = tfm.depths [d] * ds
self.italic_correction = tfm.italic_corrections[i]*ds
class Tex_font_metric:
"""
Bare bones wrapper around the TFM format.
"""
def __init__ (self):
pass
def has_char (self, code):
if code < self.start_code or code > self.end_code:
return 0
tup = self.chars[code - self.start_code]
return tup[0] != 0
def get_char (self,code):
tup = self.chars[code - self.start_code]
return Char_metric (self, tup)
def __str__ (self):
return r"""#<TFM file
char: %d, %d
checksum: %d
design_size: %f
coding: %s>""" % (self.start_code, self.end_code,
self.checksum, self.design_size, self.coding)
def read_tfm_file (fn):
reader =Tfm_reader (open (fn, 'rb').read ())
return reader.get_tfm ()
if __name__=='__main__':
t = read_tfm_file (sys.argv[1])
print(t, t.design_size, t.coding)
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