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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
from nototools import unicode_data
import temporary_touchups
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 apply_temporary_fixes(font):
"""Apply some temporary fixes.
"""
# 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, and the arrows from the cmap table.
#
# Arrows are removed to maximize consistency of arrows, since the rest
# of the arrows come from Noto Symbols.
#
# And here are the bugs for the other two issues:
# 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
font_data.delete_from_cmap(font, [
0x0009, # tab
0x20E3, # combining keycap
0x2191, 0x2193, # vertical arrows
])
# 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)
temporary_touchups.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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