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#!/usr/bin/python
"""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
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
def apply_temporary_fixes(font):
"""Apply some temporary fixes."""
# Make sure macStyle is correct
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.
os2 = font['OS/2']
os2.fsType = 0
# Set the font vendor to Google
os2.achVendID = 'GOOG'
# Drop the lookup forming the ff ligature
drop_lookup(font['GSUB'], 5)
# Fix the digit widths
fix_digit_widths(font)
# Add cmap for U+2117 SOUND RECORDING COPYRIGHT
font_data.add_to_cmap(font, {0x2117: 'published'})
# Fix version number from buildnumber.txt
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, and the arrows from the cmap table
font_data.delete_from_cmap(font, [0x0009, 0x20E3, 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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