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-rwxr-xr-xscripts/touchup_for_web.py185
1 files changed, 185 insertions, 0 deletions
diff --git a/scripts/touchup_for_web.py b/scripts/touchup_for_web.py
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+#!/usr/bin/python
+"""Post-build web fonts changes for Roboto."""
+
+import collections
+import os
+from os import path
+import sys
+
+from fontTools import ttLib
+from nototools import font_data
+from nototools import unicode_data
+
+
+def drop_lookup(table, lookup_number):
+ """Drop a lookup from an OpenType table by number.
+
+ Actually remove pointers from features to the lookup, which should be less
+ intrusive.
+ """
+ for feature in table.table.FeatureList.FeatureRecord:
+ if lookup_number in feature.Feature.LookupListIndex:
+ feature.Feature.LookupListIndex.remove(lookup_number)
+ feature.Feature.LookupCount -= 1
+
+
+def get_font_name(font):
+ """Gets the name of the font from the name table."""
+ return font_data.get_name_records(font)[4]
+
+
+DIGITS = ['zero', 'one', 'two', 'three', 'four',
+ 'five', 'six', 'seven', 'eight', 'nine']
+
+def fix_digit_widths(font):
+ """Change all digit widths in the font to be the same."""
+ hmtx_table = font['hmtx']
+ widths = [hmtx_table[digit][0] for digit in DIGITS]
+ if len(set(widths)) > 1:
+ width_counter = collections.Counter(widths)
+ most_common_width = width_counter.most_common(1)[0][0]
+ print 'Digit widths were %s.' % repr(widths)
+ print 'Setting all glyph widths to %d.' % most_common_width
+ for digit in DIGITS:
+ assert abs(hmtx_table[digit][0] - most_common_width) <= 1
+ hmtx_table[digit][0] = most_common_width
+
+
+_MAP_SPACING_TO_COMBINING = {
+ 'acute': 'acutecomb',
+ 'breve': 'brevenosp',
+ 'caron': 'uni030C',
+ 'cedilla': 'cedillanosp',
+ 'circumflex': 'circumflexnosp',
+ 'dieresis': 'dieresisnosp',
+ 'dotaccent': 'dotnosp',
+ 'grave': 'gravecomb',
+ 'hungarumlaut': 'acutedblnosp',
+ 'macron': 'macroncomb',
+ 'ogonek': 'ogoneknosp',
+ 'tilde': 'tildecomb',
+ 'ring': 'ringnosp',
+ 'tonos': 'acutecomb',
+ 'uni02F3': 'ringsubnosp',
+}
+
+def fix_ccmp_lookup(font):
+ """Fixes the broken ccmp lookup."""
+ cmap = font_data.get_cmap(font)
+ reverse_cmap = {name: code for (code, name) in cmap.items()}
+
+ # Where we know the bad 'ccmp' is
+ ccmp_lookup = font['GSUB'].table.LookupList.Lookup[2]
+ assert ccmp_lookup.LookupType == 4
+ assert ccmp_lookup.SubTableCount == 1
+ ligatures = ccmp_lookup.SubTable[0].ligatures
+ for first_char, ligtable in ligatures.iteritems():
+ ligatures_to_delete = []
+ for index, ligature in enumerate(ligtable):
+ assert len(ligature.Component) == 1
+ component = ligature.Component[0]
+ if (component.endswith('comb')
+ or component in ['commaaccent',
+ 'commaaccentrotate',
+ 'ringacute']):
+ continue
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=54
+ if first_char == 'a' and component == 'uni02BE':
+ ligatures_to_delete.append(index)
+ continue
+ char = reverse_cmap[component]
+ general_category = unicode_data.category(char)
+ if general_category != 'Mn': # not a combining mark
+ ligature.Component[0] = _MAP_SPACING_TO_COMBINING[component]
+ ligatures[first_char] = [
+ ligature for (index, ligature) in enumerate(ligtable)
+ if index not in ligatures_to_delete]
+
+
+def apply_temporary_fixes(font):
+ """Apply some temporary fixes.
+ """
+ # Make sure macStyle is correct
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=8
+ font_name = get_font_name(font)
+ bold = ('Bold' in font_name) or ('Black' in font_name)
+ italic = 'Italic' in font_name
+ font['head'].macStyle = (italic << 1) | bold
+
+ # Mark the font free for installation, embedding, etc.
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=29
+ os2 = font['OS/2']
+ os2.fsType = 0
+
+ # Set the font vendor to Google
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=46
+ os2.achVendID = 'GOOG'
+
+ # Drop the lookup forming the ff ligature
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=47
+ drop_lookup(font['GSUB'], 5)
+
+ # Correct the ccmp lookup to use combining marks instead of spacing ones
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=48
+ fix_ccmp_lookup(font)
+
+ # Fix the digit widths
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=49
+ fix_digit_widths(font)
+
+ # Add cmap for U+2117 SOUND RECORDING COPYRIGHT
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=44
+ font_data.add_to_cmap(font, {0x2117: 'published'})
+
+ # Fix version number from buildnumber.txt
+ # https://code.google.com/a/google.com/p/roboto/issues/detail?id=50
+ from datetime import date
+
+ build_number_txt = path.join(
+ path.dirname(__file__), os.pardir, 'res', 'buildnumber.txt')
+ build_number = open(build_number_txt).read().strip()
+
+ version_record = 'Version 2.0%s; %d' % (build_number, date.today().year)
+
+ for record in font['name'].names:
+ if record.nameID == 5:
+ if record.platformID == 1 and record.platEncID == 0: # MacRoman
+ record.string = version_record
+ elif record.platformID == 3 and record.platEncID == 1:
+ # Windows UCS-2
+ record.string = version_record.encode('UTF-16BE')
+ else:
+ assert False
+
+
+def apply_web_specific_fixes(font):
+ """Apply fixes needed for web fonts."""
+ # Set ascent, descent, and lineGap values to Android K values
+ hhea = font['hhea']
+ hhea.ascent = 1900
+ hhea.descent = -500
+ hhea.lineGap = 0
+
+ os2 = font['OS/2']
+ os2.sTypoAscender = 1536
+ os2.sTypoDescender = -512
+ os2.sTypoLineGap = 102
+ os2.usWinAscent = 1946
+ os2.usWinDescent = 512
+
+
+def correct_font(source_font_name, target_font_name):
+ """Corrects metrics and other meta information."""
+ font = ttLib.TTFont(source_font_name)
+# apply_temporary_fixes(font)
+ apply_web_specific_fixes(font)
+ font.save(target_font_name)
+
+
+def main(argv):
+ """Correct the font specified in the command line."""
+ correct_font(argv[1], argv[2])
+
+
+if __name__ == "__main__":
+ main(sys.argv)