Create no-flags CBDT font
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"""Removes regional indicators from a font."""
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from fontTools import subset
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from fontTools import ttLib
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import functools
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from pathlib import Path
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import sys
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from typing import Set
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def codepoints(font: ttLib.TTFont) -> Set[int]:
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unicode_cmaps = (t.cmap.keys() for t in font['cmap'].tables if t.isUnicode())
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return functools.reduce(lambda acc, u: acc | u, unicode_cmaps, set())
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def is_regional_indicator(cp: int) -> bool:
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return 0x1F1E6 <= cp <= 0x1F1FF
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def main(argv):
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for font_file in sorted(argv[1:]):
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font_file = Path(font_file)
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assert font_file.is_file(), font_file
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noflags_file = font_file.with_stem(font_file.stem + "-noflags")
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font = ttLib.TTFont(font_file)
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if noflags_file.is_file():
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print(font_file, f"({font_type}) already has", noflags_file, "; nop")
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continue
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cps = codepoints(font)
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cps_without_flags = {cp for cp in cps if not is_regional_indicator(cp)}
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font_type = []
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if "CBDT" in font:
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font_type.append("CBDT")
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if "COLR" in font:
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font_type.append("COLR")
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font_type = "_".join(font_type)
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if cps == cps_without_flags:
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print(font_file, f"({font_type}) has no regional indicators")
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continue
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subsetter = subset.Subsetter()
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subsetter.populate(unicodes=cps_without_flags)
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subsetter.subset(font)
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font.save(noflags_file)
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print(font_file, f"({font_type}) =>" , noflags_file)
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if __name__ == '__main__':
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main(sys.argv)
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