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fbarchard@google.com committed 7a24bd85773
allow null dst_y on biplanar and triplanar functions BUG=none TEST=none Review URL: http://webrtc-codereview.appspot.com/335015 git-svn-id: http://libyuv.googlecode.com/svn/trunk@123 16f28f9a-4ce2-e073-06de-1de4eb20be90