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#!/usr/bin/env python
#
# Copyright 2010-2012, Google Inc.
# Author: Mikhail Kashkin (mkashkin@gmail.com)
# Author: Raph Levien (<firstname.lastname>@gmail.com)
# Author: Dave Crossland (dave@understandinglimited.com)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0.txt
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Version 1.01 Released 2012-03-27
#
# A script for subsetting a font, using FontForge. See README for details.
# TODO 2013-04-08 ensure the menu files are as compact as possible by default,
# similar to subset.pl
# TODO 2013-05-22 in Arimo, the latin subset doesn't include ; but the greek
# does. why on earth is this happening?
import getopt
import os
import struct
import subprocess
import sys
import fontforge
def log_namelist(name, unicode):
if name and isinstance(unicode, int):
print(f"0x{unicode:04X}", fontforge.nameeFromUnicode(unicode),
file=name)
def select_with_refs(font, unicode, newfont, pe=None, name=None):
newfont.selection.select(('more', 'unicode'), unicode)
log_namelist(name, unicode)
if pe:
print(f"SelectMore({unicode})", file=pe)
try:
for ref in font[unicode].references:
newfont.selection.select(('more',), ref[0])
log_namelist(name, ref[0])
if pe:
print(f'SelectMore("{ref[0]}")', file=pe)
except Exception:
print(f'Resolving references on u+{unicode:04x} failed')
def subset_font_raw(font_in, font_out, unicodes, opts):
if '--namelist' in opts:
# 2010-12-06 DC To allow setting namelist filenames,
# change getopt.gnu_getopt from namelist to namelist=
# and invert comments on following 2 lines
# name_fn = opts['--namelist']
name_fn = f'{font_out}.name'
name = open(name_fn, 'w')
else:
name = None
if '--script' in opts:
pe_fn = "/tmp/script.pe"
pe = open(pe_fn, 'w')
else:
pe = None
font = fontforge.open(font_in)
if pe:
print(f'Open("{font_in}")', file=pe)
extract_vert_to_script(font_in, pe)
for i in unicodes:
select_with_refs(font, i, font, pe, name)
addl_glyphs = []
if '--nmr' in opts:
addl_glyphs.append('nonmarkingreturn')
if '--null' in opts:
addl_glyphs.append('.null')
if '--nd' in opts:
addl_glyphs.append('.notdef')
for glyph in addl_glyphs:
font.selection.select(('more',), glyph)
if name:
print(f"0x{fontforge.unicodeFromName(glyph):0.4X}", glyph,
file=name)
if pe:
print(f'SelectMore("{glyph}")', file=pe)
flags = ()
if '--opentype-features' in opts:
flags += ('opentype',)
if '--simplify' in opts:
font.simplify()
font.round()
flags += ('omit-instructions',)
if '--strip_names' in opts:
font.sfnt_names = ()
if '--new' in opts:
font.copy()
new = fontforge.font()
new.encoding = font.encoding
new.em = font.em
new.layers['Fore'].is_quadratic = font.layers['Fore'].is_quadratic
for i in unicodes:
select_with_refs(font, i, new, pe, name)
new.paste()
# This is a hack - it should have been taken care of above.
font.selection.select('space')
font.copy()
new.selection.select('space')
new.paste()
new.sfnt_names = font.sfnt_names
font = new
else:
font.selection.invert()
print("SelectInvert()", file=pe)
font.cut()
print("Clear()", file=pe)
if '--move-display' in opts:
print("Moving display glyphs into Unicode ranges...")
font.familyname += " Display"
font.fullname += " Display"
font.fontname += "Display"
font.appendSFNTName('English (US)', 'Family', font.familyname)
font.appendSFNTName('English (US)', 16, font.familyname)
font.appendSFNTName('English (US)', 17, 'Display')
font.appendSFNTName('English (US)', 'Fullname', font.fullname)
for glname in unicodes:
font.selection.none()
if isinstance(glname, str):
if glname.endswith('.display'):
font.selection.select(glname)
font.copy()
font.selection.none()
newgl = glname.replace('.display', '')
font.selection.select(newgl)
font.paste()
font.selection.select(glname)
font.cut()
if name:
print("Writing NameList", end="")
name.close()
if pe:
print(f'Generate("{font_out}")', file=pe)
pe.close()
subprocess.call(["fontforge", "-script", pe_fn])
else:
font.generate(font_out, flags=flags)
font.close()
if '--roundtrip' in opts:
# FontForge apparently contains a bug where it incorrectly calculates
# the advanceWidthMax in the hhea table, and a workaround is to open
# and re-generate
font2 = fontforge.open(font_out)
font2.generate(font_out, flags=flags)
def subset_font(font_in, font_out, unicodes, opts):
font_out_raw = font_out
if not font_out_raw.endswith('.ttf'):
font_out_raw += '.ttf'
subset_font_raw(font_in, font_out_raw, unicodes, opts)
if font_out != font_out_raw:
os.rename(font_out_raw, font_out)
# 2011-02-14 DC this needs to only happen with --namelist is used
# os.rename(font_out_raw + '.name', font_out + '.name')
def getsubset(subset, font_in):
subsets = subset.split('+')
quotes = [
0x2013, # endash
0x2014, # emdash
0x2018, # quoteleft
0x2019, # quoteright
0x201A, # quotesinglbase
0x201C, # quotedblleft
0x201D, # quotedblright
0x201E, # quotedblbase
0x2022, # bullet
0x2039, # guilsinglleft
0x203A, # guilsinglright
]
latin = [
*range(0x20, 0x7f), # Basic Latin (A-Z, a-z, numbers)
*range(0xa0, 0x100), # Western European symbols and diacritics
0x20ac, # Euro
0x0152, # OE
0x0153, # oe
0x003b, # semicolon
0x00b7, # periodcentered
0x0131, # dotlessi
0x02c6, # circumflex
0x02da, # ring
0x02dc, # tilde
0x2074, # foursuperior
0x2215, # division slash
0x2044, # fraction slash
0xe0ff, # PUA: Font logo
0xeffd, # PUA: Font version number
0xf000, # PUA: font ppem size indicator: run
# `ftview -f 1255 10 Ubuntu-Regular.ttf` to see it in action!
]
result = quotes
if 'menu' in subsets:
font = fontforge.open(font_in)
result = [
*map(ord, font.familyname),
0x0020,
]
if 'latin' in subsets:
result += latin
if 'latin-ext' in subsets:
# These ranges include Extended A, B, C, D, and Additional with the
# exception of Vietnamese, which is a separate range
result += [
*range(0x100, 0x370),
*range(0x1d00, 0x1ea0),
*range(0x1ef2, 0x1f00),
*range(0x2070, 0x20d0),
*range(0x2c60, 0x2c80),
*range(0xa700, 0xa800),
]
if 'vietnamese' in subsets:
# 2011-07-16 DC: Charset from
# http://vietunicode.sourceforge.net/charset/ + U+1ef9 from Fontaine
result += [0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00C8, 0x00C9,
0x00CA, 0x00CC, 0x00CD, 0x00D2, 0x00D3, 0x00D4,
0x00D5, 0x00D9, 0x00DA, 0x00DD, 0x00E0, 0x00E1,
0x00E2, 0x00E3, 0x00E8, 0x00E9, 0x00EA, 0x00EC,
0x00ED, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F9,
0x00FA, 0x00FD, 0x0102, 0x0103, 0x0110, 0x0111,
0x0128, 0x0129, 0x0168, 0x0169, 0x01A0, 0x01A1,
0x01AF, 0x01B0, 0x20AB, *range(0x1EA0, 0x1EFA)]
if 'greek' in subsets:
# Could probably be more aggressive here and exclude archaic
# characters, but lack data
result += [*range(0x370, 0x400)]
if 'greek-ext' in subsets:
result += [*range(0x370, 0x400), *range(0x1f00, 0x2000)]
if 'cyrillic' in subsets:
# Based on character frequency analysis
result += [*range(0x400, 0x460), 0x490, 0x491, 0x4b0, 0x4b1, 0x2116]
if 'cyrillic-ext' in subsets:
result += [
*range(0x400, 0x530),
0x20b4,
# 0x2116 is the russian No, a number abbreviation similar to the
# latin #, suggested by Alexei Vanyashin
0x2116,
*range(0x2de0, 0x2e00),
*range(0xa640, 0xa6a0),
]
if 'arabic' in subsets:
# Based on Droid Arabic Kufi 1.0
result += [0x000D, 0x0020, 0x0621, 0x0627, 0x062D,
0x062F, 0x0631, 0x0633, 0x0635, 0x0637, 0x0639,
0x0643, 0x0644, 0x0645, 0x0647, 0x0648, 0x0649,
0x0640, 0x066E, 0x066F, 0x0660, 0x0661, 0x0662,
0x0663, 0x0664, 0x0665, 0x0666, 0x0667, 0x0668,
0x0669, 0x06F4, 0x06F5, 0x06F6, 0x06BE, 0x06D2,
0x06A9, 0x06AF, 0x06BA, 0x066A, 0x061F, 0x060C,
0x061B, 0x066B, 0x066C, 0x066D, 0x064B, 0x064D,
0x064E, 0x064F, 0x064C, 0x0650, 0x0651, 0x0652,
0x0653, 0x0654, 0x0655, 0x0670, 0x0656, 0x0615,
0x0686, 0x0623, 0x0625, 0x0622, 0x0671, 0x0628,
0x067E, 0x062A, 0x062B, 0x0679, 0x0629, 0x062C,
0x062E, 0x0630, 0x0688, 0x0632, 0x0691, 0x0698,
0x0634, 0x0636, 0x0638, 0x063A, 0x0641, 0x0642,
0x0646, 0x06D5, 0x06C0, 0x0624, 0x064A, 0x06CC,
0x06D3, 0x0626, 0x06C2, 0x06C1, 0x06C3, 0x06F0,
0x06F1, 0x06F2, 0x06F3, 0x06F9, 0x06F7, 0x06F8,
0xFC63, 0x0672, 0x0673, 0x0675, 0x0676, 0x0677,
0x0678, 0x067A, 0x067B, 0x067C, 0x067D, 0x067F,
0x0680, 0x0681, 0x0682, 0x0683, 0x0684, 0x0685,
0x0687, 0x0689, 0x068A, 0x068B, 0x068C, 0x068D,
0x068E, 0x068F, 0x0690, 0x0692, 0x0693, 0x0694,
0x0695, 0x0696, 0x0697, 0x0699, 0x069A, 0x069B,
0x069C, 0x069D, 0x069E, 0x069F, 0x06A0, 0x06A1,
0x06A2, 0x06A3, 0x06A5, 0x06A6, 0x06A7, 0x06A8,
0x06AA, 0x06AB, 0x06AC, 0x06AD, 0x06AE, 0x06B0,
0x06B1, 0x06B2, 0x06B3, 0x06B4, 0x06B5, 0x06B6,
0x06B7, 0x06B8, 0x06B9, 0x06BB, 0x06BC, 0x06BD,
0x06BF, 0x06C4, 0x06C5, 0x06CD, 0x06D6, 0x06D7,
0x06D8, 0x06D9, 0x06DA, 0x06DB, 0x06DC, 0x06DF,
0x06E1, 0x06E2, 0x06E3, 0x06E4, 0x06E5, 0x06E6,
0x06E7, 0x06E8, 0x06EA, 0x06EB, 0x06ED, 0x06FB,
0x06FC, 0x06FD, 0x06FE, 0x0600, 0x0601, 0x0602,
0x0603, 0x060E, 0x060F, 0x0610, 0x0611, 0x0612,
0x0613, 0x0614, 0x0657, 0x0658, 0x06EE, 0x06EF,
0x06FF, 0x060B, 0x061E, 0x0659, 0x065A, 0x065B,
0x065C, 0x065D, 0x065E, 0x0750, 0x0751, 0x0752,
0x0753, 0x0754, 0x0755, 0x0756, 0x0757, 0x0758,
0x0759, 0x075A, 0x075B, 0x075C, 0x075D, 0x075E,
0x075F, 0x0760, 0x0761, 0x0762, 0x0763, 0x0764,
0x0765, 0x0766, 0x0767, 0x0768, 0x0769, 0x076A,
0x076B, 0x076C, 0x076D, 0x06A4, 0x06C6, 0x06C7,
0x06C8, 0x06C9, 0x06CA, 0x06CB, 0x06CF, 0x06CE,
0x06D0, 0x06D1, 0x06D4, 0x06FA, 0x06DD, 0x06DE,
0x06E0, 0x06E9, 0x060D, 0xFD3E, 0xFD3F, 0x25CC,
# Added from
# https://groups.google.com/d/topic/googlefontdirectory-discuss/MwlMWMPNCXs/discussion
0x063b, 0x063c, 0x063d, 0x063e, 0x063f, 0x0620,
0x0674, 0x0674, 0x06EC]
if 'dejavu-ext' in subsets:
# add all glyphnames ending in .display
font = fontforge.open(font_in)
for glyph in font.glyphs():
if glyph.glyphname.endswith('.display'):
result.append(glyph.glyphname)
return result
# code for extracting vertical metrics from a TrueType font
class Sfnt:
def __init__(self, data):
_, numTables, _, _, _ = struct.unpack('>IHHHH', data[:12])
self.tables = {}
for i in range(numTables):
tag, _, offset, length = struct.unpack(
'>4sIII', data[12 + 16 * i: 28 + 16 * i])
self.tables[tag] = data[offset: offset + length]
def hhea(self):
r = {}
d = self.tables['hhea']
r['Ascender'], r['Descender'], r['LineGap'] = struct.unpack(
'>hhh', d[4:10])
return r
def os2(self):
r = {}
d = self.tables['OS/2']
r['fsSelection'], = struct.unpack('>H', d[62:64])
r['sTypoAscender'], r['sTypoDescender'], r['sTypoLineGap'] = \
struct.unpack('>hhh', d[68:74])
r['usWinAscender'], r['usWinDescender'] = struct.unpack(
'>HH', d[74:78])
return r
def set_os2(pe, name, val):
print(f'SetOS2Value("{name}", {val:d})', file=pe)
def set_os2_vert(pe, name, val):
set_os2(pe, name + 'IsOffset', 0)
set_os2(pe, name, val)
# Extract vertical metrics data directly out of font file, and emit
# script code to set the values in the generated font. This is a (rather
# ugly) workaround for the issue described in:
# https://sourceforge.net/p/fontforge/mailman/fontforge-users/thread/20100906085718.GB1907@khaled-laptop/
def extract_vert_to_script(font_in, pe):
with open(font_in, 'rb') as in_file:
data = in_file.read()
sfnt = Sfnt(data)
hhea = sfnt.hhea()
os2 = sfnt.os2()
set_os2_vert(pe, "WinAscent", os2['usWinAscender'])
set_os2_vert(pe, "WinDescent", os2['usWinDescender'])
set_os2_vert(pe, "TypoAscent", os2['sTypoAscender'])
set_os2_vert(pe, "TypoDescent", os2['sTypoDescender'])
set_os2_vert(pe, "HHeadAscent", hhea['Ascender'])
set_os2_vert(pe, "HHeadDescent", hhea['Descender'])
def main(argv):
optlist, args = getopt.gnu_getopt(argv, '', [
'string=', 'strip_names', 'opentype-features', 'simplify', 'new',
'script', 'nmr', 'roundtrip', 'subset=', 'namelist', 'null', 'nd',
'move-display'])
font_in, font_out = args
opts = dict(optlist)
if '--string' in opts:
subset = map(ord, opts['--string'])
else:
subset = getsubset(opts.get('--subset', 'latin'), font_in)
subset_font(font_in, font_out, subset, opts)
if __name__ == '__main__':
main(sys.argv[1:])
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