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https://github.com/google/fonts.git
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108 lines
2.7 KiB
Python
108 lines
2.7 KiB
Python
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import contextlib
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import os
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from fontTools import ttLib
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from google.apputils import app
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from util import google_fonts as fonts
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def _LoadGlyf(font, char, name, problems):
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"""Loads a glyf and expands (populates fields) it.
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Args:
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font: A TTFont.
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char: int id of char, e.g. ord('C').
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name: name to use in problems string describing char. e.g. SPACE.
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problems: set to add problems to.
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Returns:
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2-tuple of (cmap_key, glyph). (None, None) if a problem occurred. Adds
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to problems if a problem occurred.
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"""
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if 'glyf' not in font:
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problems.add('NO_GLYF_TABLE')
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return (None, None)
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cmap = fonts.UnicodeCmapTables(font).next().cmap
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if char not in cmap:
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problems.add('NO_%s' % name)
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return (None, None)
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key = cmap[char]
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glyph = font['glyf'].glyphs[key]
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glyph.expand(font['glyf'])
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return (key, glyph)
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def _HasInk(font, glyph_name):
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"""Checks if specified glyph has any ink.
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That is, that it has at least one defined contour associated. Composites are
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considered to have ink if any of their components have ink.
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Args:
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font: A TTFont that has a 'glyf' table.
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glyph_name: The name of the glyph to check for ink.
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Returns:
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True if the font has at least one contour associated with it.
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"""
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glyph = font['glyf'].glyphs[glyph_name]
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glyph.expand(font['glyf'])
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if not glyph.isComposite():
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if glyph.numberOfContours == 0:
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return False
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(coords, _, _) = glyph.getCoordinates(font['glyf'])
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# you need at least 3 points to draw
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return len(coords) > 2
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# composite is blank if composed of blanks
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# if you setup a font with cycles you are just a bad person
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for glyph_name in glyph.getComponentNames(glyph.components):
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if _HasInk(font, glyph_name):
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return True
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return False
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def _CheckFont(font):
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"""Inspects a font for space/nbsp issues.
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Args:
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font: A TTFont.
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Returns:
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A set of strings describing problems found in the font. Empty set if none.
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"""
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problems = set()
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(space_cmap, _) = _LoadGlyf(font, 0x0020, 'SPACE', problems)
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(nbsp_cmap, _) = _LoadGlyf(font, 0x00A0, 'NBSP', problems)
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if nbsp_cmap and _HasInk(font, nbsp_cmap):
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problems.add('NBSP_HAS_INK')
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if space_cmap and _HasInk(font, space_cmap):
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problems.add('SPACE_HAS_INK')
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if nbsp_cmap and space_cmap:
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if font['hmtx'][nbsp_cmap][0] != font['hmtx'][space_cmap][0]:
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problems.add('SPACE_NBSP_WIDTH_MISMATCH')
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return set(problems)
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def main(argv):
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for filename in argv[1:]:
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with contextlib.closing(ttLib.TTFont(filename)) as font:
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problems = _CheckFont(font)
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if not problems:
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problems.add('OK')
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print '{:48} {}'.format(os.path.basename(filename),
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','.join(sorted(problems)))
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if __name__ == '__main__':
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app.run()
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