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Inconsistent distortion metric in vp8_rd_pick_intra_mbuv_mode

This function was using a variance metric compared to and SSE metric in
other places (eg. vp8_rd_inter_uv)

Change-Id: I9109fcc5a13bca9db1d7ead500fe14999ab233eb

--- a/vp8/encoder/rdopt.c

+++ b/vp8/encoder/rdopt.c

@@ -813,7 +813,7 @@

         rate_to = rd_cost_mbuv(x);

         rate = rate_to + x->intra_uv_mode_cost[x->e_mbd.frame_type][x->e_mbd.mode_info_context->mbmi.uv_mode];

-        distortion = vp8_get_mbuvrecon_error(IF_RTCD(&cpi->rtcd.variance), x);

+        distortion = ENCODEMB_INVOKE(&cpi->rtcd.encodemb, mbuverr)(x) / 4;

         this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);

-- 

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