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#!/usr/bin/python
#
# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# 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.
"""Post-build changes for Roboto for Android."""
import collections
import os
from os import path
import sys
from fontTools import ttLib
from nototools import font_data
from nototools import unicode_data
def drop_lookup(table, lookup_number):
"""Drop a lookup from an OpenType table by number.
Actually remove pointers from features to the lookup, which should be less
intrusive.
"""
for feature in table.table.FeatureList.FeatureRecord:
if lookup_number in feature.Feature.LookupListIndex:
feature.Feature.LookupListIndex.remove(lookup_number)
feature.Feature.LookupCount -= 1
def get_font_name(font):
"""Gets the name of the font from the name table."""
return font_data.get_name_records(font)[4]
DIGITS = ['zero', 'one', 'two', 'three', 'four',
'five', 'six', 'seven', 'eight', 'nine']
def fix_digit_widths(font):
"""Change all digit widths in the font to be the same."""
hmtx_table = font['hmtx']
widths = [hmtx_table[digit][0] for digit in DIGITS]
if len(set(widths)) > 1:
width_counter = collections.Counter(widths)
most_common_width = width_counter.most_common(1)[0][0]
print 'Digit widths were %s.' % repr(widths)
print 'Setting all glyph widths to %d.' % most_common_width
for digit in DIGITS:
assert abs(hmtx_table[digit][0] - most_common_width) <= 1
hmtx_table[digit][0] = most_common_width
_MAP_SPACING_TO_COMBINING = {
'acute': 'acutecomb',
'breve': 'brevenosp',
'caron': 'uni030C',
'cedilla': 'cedillanosp',
'circumflex': 'circumflexnosp',
'dieresis': 'dieresisnosp',
'dotaccent': 'dotnosp',
'grave': 'gravecomb',
'hungarumlaut': 'acutedblnosp',
'macron': 'macroncomb',
'ogonek': 'ogoneknosp',
'tilde': 'tildecomb',
'ring': 'ringnosp',
'tonos': 'acutecomb',
'uni02F3': 'ringsubnosp',
}
def fix_ccmp_lookup(font):
"""Fixes the broken ccmp lookup."""
cmap = font_data.get_cmap(font)
reverse_cmap = {name: code for (code, name) in cmap.items()}
# Where we know the bad 'ccmp' is
ccmp_lookup = font['GSUB'].table.LookupList.Lookup[2]
assert ccmp_lookup.LookupType == 4
assert ccmp_lookup.SubTableCount == 1
ligatures = ccmp_lookup.SubTable[0].ligatures
for first_char, ligtable in ligatures.iteritems():
ligatures_to_delete = []
for index, ligature in enumerate(ligtable):
assert len(ligature.Component) == 1
component = ligature.Component[0]
if (component.endswith('comb')
or component in ['commaaccent',
'commaaccentrotate',
'ringacute']):
continue
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=54
if first_char == 'a' and component == 'uni02BE':
ligatures_to_delete.append(index)
continue
char = reverse_cmap[component]
general_category = unicode_data.category(char)
if general_category != 'Mn': # not a combining mark
ligature.Component[0] = _MAP_SPACING_TO_COMBINING[component]
ligatures[first_char] = [
ligature for (index, ligature) in enumerate(ligtable)
if index not in ligatures_to_delete]
def apply_temporary_fixes(font):
"""Apply some temporary fixes.
"""
# Make sure macStyle is correct
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=8
font_name = get_font_name(font)
bold = ('Bold' in font_name) or ('Black' in font_name)
italic = 'Italic' in font_name
font['head'].macStyle = (italic << 1) | bold
# Mark the font free for installation, embedding, etc.
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=29
os2 = font['OS/2']
os2.fsType = 0
# Set the font vendor to Google
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=46
os2.achVendID = 'GOOG'
# Drop the lookup forming the ff ligature
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=47
drop_lookup(font['GSUB'], 5)
# Correct the ccmp lookup to use combining marks instead of spacing ones
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=48
fix_ccmp_lookup(font)
# Fix the digit widths
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=49
fix_digit_widths(font)
# Add cmap for U+2117 SOUND RECORDING COPYRIGHT
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=44
font_data.add_to_cmap(font, {0x2117: 'published'})
# Fix version number from buildnumber.txt
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=50
from datetime import date
build_number_txt = path.join(
path.dirname(__file__), os.pardir, 'res', 'buildnumber.txt')
build_number = open(build_number_txt).read().strip()
version_record = 'Version 2.0%s; %d' % (build_number, date.today().year)
for record in font['name'].names:
if record.nameID == 5:
if record.platformID == 1 and record.platEncID == 0: # MacRoman
record.string = version_record
elif record.platformID == 3 and record.platEncID == 1:
# Windows UCS-2
record.string = version_record.encode('UTF-16BE')
else:
assert False
def apply_android_specific_fixes(font):
"""Apply fixes needed for Android."""
# Set ascent, descent, and lineGap values to Android K values
hhea = font['hhea']
hhea.ascent = 1900
hhea.descent = -500
hhea.lineGap = 0
# Remove tab, combining keycap, the arrows, and unassigned characters
# from the cmap table
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=51
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=52
# https://code.google.com/a/google.com/p/roboto/issues/detail?id=53
font_data.delete_from_cmap(font, [
0x0009, 0x20E3, 0x2072, 0x2073, 0x208F, 0x2191, 0x2193])
# Drop tables not useful on Android
for table in ['LTSH', 'hdmx', 'VDMX', 'gasp']:
if table in font:
del font[table]
def correct_font(source_font_name, target_font_name):
"""Corrects metrics and other meta information."""
font = ttLib.TTFont(source_font_name)
apply_temporary_fixes(font)
apply_android_specific_fixes(font)
font.save(target_font_name)
def main(argv):
"""Correct the font specified in the command line."""
correct_font(argv[1], argv[2])
if __name__ == "__main__":
main(sys.argv)
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