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Add block size scaling in rd_variance_adjustment()

Scale the block variance values used in this function
to a common block size.

Change-Id: I73ad7d48b2621f312d771ee0dd7b6fc59cfc1652

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -3013,6 +3013,8 @@

   unsigned int absvar_diff = 0;

   unsigned int var_factor = 0;

   unsigned int adj_max;

+  const int bw = num_8x8_blocks_wide_lookup[bsize];

+  const int bh = num_8x8_blocks_high_lookup[bsize];

   vp9e_tune_content content_type = cpi->oxcf.content;

   if (*this_rd == INT64_MAX) return;

@@ -3031,6 +3033,10 @@

   rec_variance = vp9_get_sby_variance(cpi, &xd->plane[0].dst, bsize);

   src_variance = vp9_get_sby_variance(cpi, &x->plane[0].src, bsize);

 #endif  // CONFIG_VP9_HIGHBITDEPTH

+

+  // Scale based on area in 8x8 blocks

+  rec_variance /= (bw * bh);

+  src_variance /= (bw * bh);

   // Lower of source (raw per pixel value) and recon variance. Note that

   // if the source per pixel is 0 then the recon value here will not be per