tree 246a1b2b190a1789ab3d3ccd83ad2b67a7b31ac4
parent afdb85196b06ca45da20df3daac142c65a926fce
author sdeng <sdeng@google.com> 1560297410 -0700
committer Sai Deng <sdeng@google.com> 1561054592 +0000

Add functions to build SSIM scaling factors

In tune=ssim mode, we need to scale rdmult based on the variance
of the current block. This CL adds the data structure and functions
to build the SSIM scaling factor array.

Change-Id: I28b3d27115ff9608b444b4045ee4fc481fc09632