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Fix alternate off-by-one

This commit is contained in:
Behdad Esfahbod 2010-05-20 17:46:20 +01:00
parent b634beb39e
commit fdca3d5160
1 changed files with 1 additions and 1 deletions
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2
src/hb-ot-layout-gsub-private.hh
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@ -287,7 +287,7 @@ struct AlternateSubstFormat1
return false; return false;
unsigned int shift = _hb_ctz (lookup_mask); unsigned int shift = _hb_ctz (lookup_mask);
unsigned int alt_index = (lookup_mask & glyph_mask) >> shift; unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift) - 1;
if (unlikely (alt_index >= alt_set.len)) if (unlikely (alt_index >= alt_set.len))
return false; return false;