tree eae38145c6c4ef46ada3cf6028722ac617ba69d9
parent 50916c6a7da357eeee43c36b4d6ab6a723ddbe1e
author Yaowu Xu <yaowu@google.com> 1306953665 -0700
committer Yaowu Xu <yaowu@google.com> 1306964646 -0700

further clean up of errorperbit and sadperbit

this commit makes the usage errorperbit and sadperbit consistent for
encoding modes and passes. Removed all different magic weight factors
associated with errorperbit. Now 1/2 is used for both sadperbit16 and
sadperbit4, the /2 operation is merged into initializations of the 2
variables.

Tests on cif set show .23%, 0.18% and 0.19% gain by avg psnr, overall
psnr and ssim respectively.

Change-Id: Ifa285c3e065ce0a5a77addfc9f95aabf54ee270d