79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright 2014 Google Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Modify an emoji font to map legacy PUA characters to standard ligatures."""
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__author__ = 'roozbeh@google.com (Roozbeh Pournader)'
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import sys
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import itertools
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from fontTools import ttLib
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from nototools import font_data
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import add_emoji_gsub
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def get_glyph_name_from_gsub(char_seq, font):
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"""Find the glyph name for ligature of a given character sequence from GSUB.
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"""
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cmap = font_data.get_cmap(font)
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# FIXME: So many assumptions are made here.
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try:
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first_glyph = cmap[char_seq[0]]
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rest_of_glyphs = [cmap[ch] for ch in char_seq[1:]]
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except KeyError:
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return None
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for lookup in font['GSUB'].table.LookupList.Lookup:
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ligatures = lookup.SubTable[0].ligatures
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try:
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for ligature in ligatures[first_glyph]:
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if ligature.Component == rest_of_glyphs:
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return ligature.LigGlyph
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except KeyError:
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continue
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return None
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def add_pua_cmap_to_font(font):
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cmap = font_data.get_cmap(font)
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for pua, (ch1, ch2) in itertools.chain(
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add_emoji_gsub.EMOJI_KEYCAPS.items(), add_emoji_gsub.EMOJI_FLAGS.items()
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):
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if pua not in cmap:
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glyph_name = get_glyph_name_from_gsub([ch1, ch2], font)
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if glyph_name is not None:
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cmap[pua] = glyph_name
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def add_pua_cmap(source_file, target_file):
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"""Add PUA characters to the cmap of the first font and save as second."""
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font = ttLib.TTFont(source_file)
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add_pua_cmap_to_font(font)
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font.save(target_file)
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def main(argv):
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"""Save the first font given to the second font."""
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add_pua_cmap(argv[1], argv[2])
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if __name__ == '__main__':
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main(sys.argv)
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