Download patch
ref: d58f90947c58a84bc6c6b9ae047bc873584f64ea parent: 82b70b34fe3ca03af1e7f79aa92d85e6917454d1 author: dongzha <dongzha@DONGZHA-WS04.cisco.com> date: Thu Nov 27 10:25:21 EST 2014
avoid using the same picture buff for prev pic and curr pic