Fix Device::get_size() calculation
diff --git a/src/hb-ot-layout-common-private.hh b/src/hb-ot-layout-common-private.hh
index 37d6782..c7c6e2b 100644
--- a/src/hb-ot-layout-common-private.hh
+++ b/src/hb-ot-layout-common-private.hh
@@ -587,7 +587,7 @@
{
unsigned int f = deltaFormat;
if (HB_UNLIKELY (f < 1 || f > 3 || startSize > endSize)) return 3 * USHORT::get_size ();
- return 3 * USHORT::get_size () + ((endSize - startSize + (1 << (4 - f)) - 1) >> (4 - f));
+ return USHORT::get_size () * (4 + ((endSize - startSize) >> (4 - f)));
}
inline bool sanitize (SANITIZE_ARG_DEF) {
@@ -598,7 +598,11 @@
private:
USHORT startSize; /* Smallest size to correct--in ppem */
USHORT endSize; /* Largest size to correct--in ppem */
- USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
+ USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3
+ * 1 Signed 2-bit value, 8 values per uint16
+ * 2 Signed 4-bit value, 4 values per uint16
+ * 3 Signed 8-bit value, 2 values per uint16
+ */
USHORT deltaValue[VAR]; /* Array of compressed data */
};
ASSERT_SIZE_VAR (Device, 6, USHORT);
