fix possible overflow in effect wrappers. am: 9e29523b95 am: baebc739b0 am: 3a9d4f4a83 am: 5b7c20dd1e am: df81fc3f3c am: 68e43cf141 am: b1338d3cfc am: 440c9e9b72 am: 9950df2504
am: de98d9b7c1

* commit 'de98d9b7c19882dd8c3394c7653ed2eeccee713c':
  fix possible overflow in effect wrappers.