commit e6eb3b53c3a816fd6cea958072107375b1a2a411
author Debargha Mukherjee <debargha@google.com> Sun Feb 26 08:50:56 2017 -0800
committer Debargha Mukherjee <debargha@google.com> Mon Feb 27 20:49:42 2017 +0000
tree 09dabf78c0243390d7ea84d4add1c86b12dbbcb6
parent 4db04d3678791a4f68057689950bbca6ffb127db

Integerize warped motion computation

Integerizes computation of the least squares for warped motion.
The model is restricted to only Affine. Affine seems easiest
to compute and integerize since it can be split into two 3-dim
least squares problems, as opposed to rotation-zoom which needs
a 4-dim least-squares problem to be solved.
The current implementation requires only one division per block.

BDRATE impact is mminimal. The upgrade to the affine model improves
coding efficiency but integerization also degrades efficiency a
little. Overall there is a net gain of about -0.07% BDRATE on
the lowres set.
BDRATE lowres: -1.113% with ----enable-warped-motion vs. without
(up from -1.044%).

Change-Id: I6b9216ac0737d76f59054293eabee48e17739ec4