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subset: fix issue subsetting Context{Subst,Pos}Format3

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Fixes https://github.com/fonttools/fonttools/issues/1879

In ChainContext{Subst,Pos}Format3, the array of input coverages is called
InputCoverage, whereas in non-Chain Context{Subst,Pos}Format3 subtables it
is called simply Coverage.
This commit is contained in:
Cosimo Lupo 2020-05-11 13:32:18 +01:00
parent b81d13952a
commit 890c5061b5
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GPG Key ID: 179A8F0895A02F4F
1 changed files with 5 additions and 2 deletions
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7
Lib/fontTools/subset/__init__.py
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@ -894,6 +894,8 @@ def __subset_classify_context(self):
self.ClassDef = 'InputClassDef' if Chain else 'ClassDef'
self.ClassDefIndex = 1 if Chain else 0
self.Input = 'Input' if Chain else 'Class'
elif Format == 3:
self.Input = 'InputCoverage' if Chain else 'Coverage'
if self.Format not in [1, 2, 3]:
return None # Don't shoot the messenger; let it go
@ -976,6 +978,7 @@ def closure_glyphs(self, s, cur_glyphs):
if not all(x.intersect(s.glyphs) for x in c.RuleData(self)):
return []
r = self
input_coverages = getattr(r, c.Input)
chaos = set()
for ll in getattr(r, c.LookupRecord):
if not ll: continue
@ -987,11 +990,11 @@ def closure_glyphs(self, s, cur_glyphs):
if seqi == 0:
pos_glyphs = frozenset(cur_glyphs)
else:
pos_glyphs = frozenset(r.InputCoverage[seqi].intersect_glyphs(s.glyphs))
pos_glyphs = frozenset(input_coverages[seqi].intersect_glyphs(s.glyphs))
lookup = s.table.LookupList.Lookup[ll.LookupListIndex]
chaos.add(seqi)
if lookup.may_have_non_1to1():
chaos.update(range(seqi, len(r.InputCoverage)+1))
chaos.update(range(seqi, len(input_coverages)+1))
lookup.closure_glyphs(s, cur_glyphs=pos_glyphs)
else:
assert 0, "unknown format: %s" % self.Format