69 lines
3.9 KiB
Python
69 lines
3.9 KiB
Python
"""Offline font subset builder. Sources and fonttools are build-only, not shipped.
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Run with fonttools on PYTHONPATH (e.g. .font-tools), from this directory.
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Source downloads: https://github.com/google/fonts/tree/main/ofl/{nunito,notosanssc}
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"""
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from pathlib import Path
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from hashlib import sha256
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import json
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from fontTools.ttLib import TTFont
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from fontTools import subset
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from fontTools.varLib.instancer import instantiateVariableFont
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root = Path(__file__).resolve().parent
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corpus = ''.join(p.read_text(encoding='utf-8') for p in (root / 'src').rglob('*')
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if p.suffix in ('.mjs', '.json'))
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previous_chars = json.loads((root / 'fonts' / 'manifest.json').read_text(encoding='utf-8')).get('characters', '')
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chars = ''.join(sorted(set(corpus + previous_chars + ''.join(chr(i) for i in range(32, 127)) + '✓→…！：·')))
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manifest = {'generator': 'fonttools', 'sources': [], 'outputs': [], 'characters': chars}
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for family, weights in [('notosanssc', [500, 600, 700]), ('nunito', [800])]:
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source = root / '.font-sources' / (family + '.ttf')
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manifest['sources'].append({'family': family, 'sha256': sha256(source.read_bytes()).hexdigest(),
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'url': 'https://github.com/google/fonts/tree/main/ofl/' + family})
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for weight in weights:
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font = TTFont(source)
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options = subset.Options()
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options.name_IDs = ['*']
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sub = subset.Subsetter(options=options)
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text = chars if family == 'notosanssc' else '0123456789'
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sub.populate(text=text)
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sub.subset(font)
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font = instantiateVariableFont(font, {'wght': weight}, inplace=True)
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name = ('NumberSwipeSans' if family == 'notosanssc' else 'NumberSwipeDigits') + str(weight)
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for record in font['name'].names:
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if record.nameID in (1, 2, 3, 4, 6, 16, 17):
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value = 'Regular' if record.nameID in (2, 17) else name
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record.string = value.encode(record.getEncoding(), errors='replace')
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target = root / 'fonts' / (name + '.ttf')
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font.save(target)
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cmap = font.getBestCmap()
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missing = sorted({c for c in text if not c.isspace() and ord(c) not in cmap})
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# Source fonts don't contain code symbols like private-use/non-printing chars;
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# all player-visible Han characters and digits must be present.
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critical = [c for c in missing if '\u4e00' <= c <= '\u9fff' or c.isdigit()]
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if critical:
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raise ValueError('Missing glyphs: ' + ''.join(critical))
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manifest['outputs'].append({'file': target.name, 'weight': weight,
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'sha256': sha256(target.read_bytes()).hexdigest(),
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'bytes': target.stat().st_size, 'glyphs': len(cmap)})
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print(target.name, target.stat().st_size)
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source = root / '.font-sources' / 'zcoolkuaile.ttf'
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font = TTFont(source)
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options = subset.Options()
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options.name_IDs = ['*']
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sub = subset.Subsetter(options=options)
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playful_chars = '重开撤销指路已走步还剩块第关0123456789 ·'
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sub.populate(text=playful_chars)
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sub.subset(font)
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for record in font['name'].names:
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if record.nameID in (1, 2, 3, 4, 6, 16, 17):
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record.string = ('Regular' if record.nameID in (2, 17) else 'NumberSwipePlayful').encode(record.getEncoding(), errors='replace')
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target = root / 'fonts' / 'NumberSwipePlayful.ttf'
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font.save(target)
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manifest['sources'].append({'family': 'zcoolkuaile', 'sha256': sha256(source.read_bytes()).hexdigest(),
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'url': 'https://github.com/google/fonts/tree/main/ofl/zcoolkuaile'})
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manifest['outputs'].append({'file': target.name, 'weight': 400, 'sha256': sha256(target.read_bytes()).hexdigest(),
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'bytes': target.stat().st_size, 'glyphs': len(font.getBestCmap()), 'characters': playful_chars})
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print(target.name, target.stat().st_size)
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(root / 'fonts' / 'manifest.json').write_text(json.dumps(manifest, ensure_ascii=False, indent=2), encoding='utf-8')
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