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Fix SingleSubstFormat1 modulo math

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This commit is contained in:
Behdad Esfahbod 2013-12-04 22:46:11 -05:00
parent ebefbbaa58
commit e06166b83a
1 changed files with 5 additions and 2 deletions
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7
Lib/fontTools/ttLib/tables/otTables.py
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@ -140,7 +140,6 @@ class SingleSubst(FormatSwitchingBaseTable):
if self.Format == 1:
delta = rawTable["DeltaGlyphID"]
inputGIDS = [ font.getGlyphID(name) for name in input ]
inputGIDS = map(doModulo, inputGIDS)
outGIDS = [ glyphID + delta for glyphID in inputGIDS ]
outGIDS = map(doModulo, outGIDS)
outNames = [ font.getGlyphName(glyphID) for glyphID in outGIDS ]
@ -160,7 +159,7 @@ class SingleSubst(FormatSwitchingBaseTable):
mapping = self.mapping = {}
items = list(mapping.items())
getGlyphID = font.getGlyphID
gidItems = ((getGlyphID(a), getGlyphID(b)) for a,b in items)
gidItems = [(getGlyphID(a), getGlyphID(b)) for a,b in items]
sortableItems = sorted(zip(gidItems, items))
# figure out format
@ -169,6 +168,10 @@ class SingleSubst(FormatSwitchingBaseTable):
for inID, outID in gidItems:
if delta is None:
delta = outID - inID
if delta < -32768:
delta += 65536
elif delta > 32767:
delta -= 65536
else:
if delta != outID - inID:
break