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Font subsetting: Fix a bug in the parsing of the GSUB table that could cause some ligatures to not be included in the subset font

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Kovid Goyal 2013-01-17 12:19:19 +05:30
parent fab5158a17
commit ffb202d93a
1 changed files with 3 additions and 2 deletions
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5
src/calibre/utils/fonts/sfnt/gsub.py
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@ -60,14 +60,15 @@ class LigatureSubstitution(UnknownLookupSubTable):
def read_ligature(self, data):
lig_glyph, count = data.unpack('HH')
components = data.unpack('%dH'%count, single_special=False)
components = data.unpack('%dH'%(count-1), single_special=False)
return (lig_glyph, components)
def all_substitutions(self, glyph_ids):
gid_index_map = self.coverage.coverage_indices(glyph_ids)
ans = set()
for index in gid_index_map.itervalues():
for start_glyph_id, index in gid_index_map.iteritems():
for glyph_id, components in self.coverage_to_lig_map[index]:
components = (start_glyph_id,) + (components)
if set(components).issubset(glyph_ids):
ans.add(glyph_id)
return ans