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Fix alternate, again

This commit is contained in:
Behdad Esfahbod 2010-05-20 17:47:28 +01:00
parent fdca3d5160
commit 1cdbfd944e
1 changed files with 3 additions and 3 deletions
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6
src/hb-ot-layout-gsub-private.hh
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@ -287,12 +287,12 @@ struct AlternateSubstFormat1
return false;
unsigned int shift = _hb_ctz (lookup_mask);
unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift) - 1;
unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift);
if (unlikely (alt_index >= alt_set.len))
if (unlikely (alt_index > alt_set.len || alt_index == 0))
return false;
glyph_id = alt_set[alt_index];
glyph_id = alt_set[alt_index - 1];
c->buffer->replace_glyph (glyph_id);