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[kern] Fix kern table Format2 offsetToIndex 

Fixes https://github.com/harfbuzz/harfbuzz/issues/1421
This commit is contained in:
Behdad Esfahbod 2018-11-28 15:06:01 -05:00
parent f9a9c0fd1e
commit a3267cf803
1 changed files with 6 additions and 2 deletions
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8
src/hb-aat-layout-kerx-table.hh
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@ -392,9 +392,13 @@ struct KerxSubTableFormat2
unsigned int num_glyphs = c->sanitizer.get_num_glyphs ();
unsigned int l = (this+leftClassTable).get_class (left, num_glyphs, 0);
unsigned int r = (this+rightClassTable).get_class (right, num_glyphs, 0);
unsigned int offset = l + r;
const FWORD *v = &StructAtOffset<FWORD> (&(this+array), offset);
const UnsizedArrayOf<FWORD> &arrayZ = this+array;
unsigned int kern_idx = l + r;
kern_idx = Types::offsetToIndex (kern_idx, this, &arrayZ);
const FWORD *v = &arrayZ[kern_idx];
if (unlikely (!v->sanitize (&c->sanitizer))) return 0;
return kerxTupleKern (*v, header.tuple_count (), this, c);
}