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[subset] Fix pruning of empty rulesets in (Chain)ContextFormat1

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Similar to 98b60757ab9bb0aaa3c1f136e5a837a1b73d22ed and the
recent commits for Format2.
This commit is contained in:
Behdad Esfahbod 2014-06-05 20:19:38 -04:00
parent a7cd151e14
commit d15afe9231
1 changed files with 7 additions and 4 deletions
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11
Lib/fontTools/subset.py
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@ -643,7 +643,8 @@ def subset_glyphs(self, s):
if self.Format == 1:
indices = self.Coverage.subset(s.glyphs)
rss = getattr(self, c.RuleSet)
rss = [rss[i] for i in indices]
rssCount = getattr(self, c.RuleSetCount)
rss = [rss[i] for i in indices if i < rssCount]
for rs in rss:
if not rs: continue
ss = getattr(rs, c.Rule)
@ -652,8 +653,10 @@ def subset_glyphs(self, s):
for glist in c.RuleData(r))]
setattr(rs, c.Rule, ss)
setattr(rs, c.RuleCount, len(ss))
# Prune empty subrulesets
rss = [rs for rs in rss if rs and getattr(rs, c.Rule)]
# Prune empty rulesets
indices = [i for i,rs in enumerate(rss) if rs and getattr(rs, c.Rule)]
self.Coverage.remap(indices)
rss = [rss[i] for i in indices]
setattr(self, c.RuleSet, rss)
setattr(self, c.RuleSetCount, len(rss))
return bool(rss)
@ -687,7 +690,7 @@ def subset_glyphs(self, s):
c.SetRuleData(r, [[klass_map.index(k) for k in klist]
for klass_map,klist in zip(klass_maps, c.RuleData(r))])
# Prune empty subrulesets
# Prune empty rulesets
rss = [rs if rs and getattr(rs, c.Rule) else None for rs in rss]
while rss and rss[-1] is None:
del rss[-1]