[instancer] fix bug in tuple varstore decompiling
when points count is 0, it means deltas will apply to all points
diff --git a/src/hb-ot-var-common.hh b/src/hb-ot-var-common.hh
index 18df261..1bc3184 100644
--- a/src/hb-ot-var-common.hh
+++ b/src/hb-ot-var-common.hh
@@ -591,7 +591,8 @@
{ fini (); return false; }
const hb_vector_t<unsigned> &indices = has_private_points ? private_indices : shared_indices;
- unsigned num_deltas = indices.length;
+ bool apply_to_all = (indices.length == 0);
+ unsigned num_deltas = apply_to_all ? point_count : indices.length;
hb_vector_t<int> deltas_x;
@@ -618,7 +619,8 @@
for (unsigned i = 0; i < num_deltas; i++)
{
- unsigned idx = indices[i];
+ unsigned idx = apply_to_all ? i : indices[i];
+ if (idx >= point_count) continue;
var.indices[idx] = true;
var.deltas_x[idx] = static_cast<float> (deltas_x[i]);
if (is_gvar)
