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add_emoji_gsub.py
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add_emoji_gsub.py
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#!/usr/bin/env python
#
# Copyright 2014 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.
"""Modify the Noto Color Emoji font to use GSUB rules for flags and keycaps."""
__author__ = "roozbeh@google.com (Roozbeh Pournader)"
import sys
from fontTools import agl
from fontTools import ttLib
from fontTools.ttLib.tables import otTables
from nototools import font_data
def create_script_list(script_tag='DFLT'):
"""Create a ScriptList for the GSUB table."""
def_lang_sys = otTables.DefaultLangSys()
def_lang_sys.ReqFeatureIndex = 0xFFFF
def_lang_sys.FeatureCount = 1
def_lang_sys.FeatureIndex = [0]
def_lang_sys.LookupOrder = None
script_record = otTables.ScriptRecord()
script_record.ScriptTag = script_tag
script_record.Script = otTables.Script()
script_record.Script.DefaultLangSys = def_lang_sys
script_record.Script.LangSysCount = 0
script_record.Script.LangSysRecord = []
script_list = otTables.ScriptList()
script_list.ScriptCount = 1
script_list.ScriptRecord = [script_record]
return script_list
def create_feature_list(feature_tag, lookup_count):
"""Create a FeatureList for the GSUB table."""
feature_record = otTables.FeatureRecord()
feature_record.FeatureTag = feature_tag
feature_record.Feature = otTables.Feature()
feature_record.Feature.LookupCount = lookup_count
feature_record.Feature.LookupListIndex = range(lookup_count)
feature_record.Feature.FeatureParams = None
feature_list = otTables.FeatureList()
feature_list.FeatureCount = 1
feature_list.FeatureRecord = [feature_record]
return feature_list
def create_lookup_list(lookups):
"""Create a LookupList for the GSUB table."""
lookup_list = otTables.LookupList()
lookup_list.LookupCount = len(lookups)
lookup_list.Lookup = lookups
return lookup_list
def get_glyph_name_or_create(char, font):
"""Return the glyph name for a character, creating if it doesn't exist."""
cmap = font_data.get_cmap(font)
if char in cmap:
return cmap[char]
glyph_name = agl.UV2AGL[char]
assert glyph_name not in font.glyphOrder
font['hmtx'].metrics[glyph_name] = [0, 0]
cmap[char] = glyph_name
if 'glyf' in font:
from fontTools.ttLib.tables import _g_l_y_f
empty_glyph = _g_l_y_f.Glyph()
font['glyf'].glyphs[glyph_name] = empty_glyph
font.glyphOrder.append(glyph_name)
return glyph_name
def create_lookup(table, font, flag=0):
"""Create a Lookup based on mapping table."""
cmap = font_data.get_cmap(font)
ligatures = {}
for output, (ch1, ch2) in table.iteritems():
output = cmap[output]
ch1 = get_glyph_name_or_create(ch1, font)
ch2 = get_glyph_name_or_create(ch2, font)
ligature = otTables.Ligature()
ligature.CompCount = 2
ligature.Component = [ch2]
ligature.LigGlyph = output
try:
ligatures[ch1].append(ligature)
except KeyError:
ligatures[ch1] = [ligature]
ligature_subst = otTables.LigatureSubst()
ligature_subst.ligatures = ligatures
lookup = otTables.Lookup()
lookup.LookupType = 4
lookup.LookupFlag = flag
lookup.SubTableCount = 1
lookup.SubTable = [ligature_subst]
return lookup
def create_simple_gsub(lookups, script='DFLT', feature='ccmp'):
"""Create a simple GSUB table."""
gsub_class = ttLib.getTableClass('GSUB')
gsub = gsub_class('GSUB')
gsub.table = otTables.GSUB()
gsub.table.Version = 1.0
gsub.table.ScriptList = create_script_list(script)
gsub.table.FeatureList = create_feature_list(feature, len(lookups))
gsub.table.LookupList = create_lookup_list(lookups)
return gsub
def reg_indicator(letter):
"""Return a regional indicator charater from corresponing capital letter.
"""
return 0x1F1E6 + ord(letter) - ord('A')
EMOJI_FLAGS = {
0xFE4E5: (reg_indicator('J'), reg_indicator('P')), # Japan
0xFE4E6: (reg_indicator('U'), reg_indicator('S')), # United States
0xFE4E7: (reg_indicator('F'), reg_indicator('R')), # France
0xFE4E8: (reg_indicator('D'), reg_indicator('E')), # Germany
0xFE4E9: (reg_indicator('I'), reg_indicator('T')), # Italy
0xFE4EA: (reg_indicator('G'), reg_indicator('B')), # United Kingdom
0xFE4EB: (reg_indicator('E'), reg_indicator('S')), # Spain
0xFE4EC: (reg_indicator('R'), reg_indicator('U')), # Russia
0xFE4ED: (reg_indicator('C'), reg_indicator('N')), # China
0xFE4EE: (reg_indicator('K'), reg_indicator('R')), # Korea
}
KEYCAP = 0x20E3
EMOJI_KEYCAPS = {
0xFE82C: (ord('#'), KEYCAP),
0xFE82E: (ord('1'), KEYCAP),
0xFE82F: (ord('2'), KEYCAP),
0xFE830: (ord('3'), KEYCAP),
0xFE831: (ord('4'), KEYCAP),
0xFE832: (ord('5'), KEYCAP),
0xFE833: (ord('6'), KEYCAP),
0xFE834: (ord('7'), KEYCAP),
0xFE835: (ord('8'), KEYCAP),
0xFE836: (ord('9'), KEYCAP),
0xFE837: (ord('0'), KEYCAP),
}
def main(argv):
"""Modify all the fonts given in the command line."""
for font_name in argv[1:]:
font = ttLib.TTFont(font_name)
assert 'GSUB' not in font
font['GSUB'] = create_simple_gsub([
create_lookup(EMOJI_KEYCAPS, font),
create_lookup(EMOJI_FLAGS, font)])
font_data.delete_from_cmap(
font, EMOJI_FLAGS.keys() + EMOJI_KEYCAPS.keys())
font.save(font_name+'-fixed')
if __name__ == '__main__':
main(sys.argv)