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ARF Boost correction for inactive regions.

Correct the ARF boost calculations to partly discount
inactive or very low energy regions of the image.

Examples (formatting bars and 0 energy areas of animated clips).

Change-Id: I241af058d10aba8c67a4deca36deb913047d4561

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -1450,15 +1450,21 @@

                                const FIRSTPASS_STATS *this_frame,

                                double this_frame_mv_in_out,

                                double max_boost) {

+  VP9_COMMON *const cm = &cpi->common;

   double frame_boost;

   const double lq =

     vp9_convert_qindex_to_q(cpi->rc.avg_frame_qindex[INTER_FRAME],

                             cpi->common.bit_depth);

   const double boost_q_correction = MIN((0.5 + (lq * 0.015)), 1.5);

-  const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)

-                      ? cpi->initial_mbs : cpi->common.MBs;

+  double inactive_pct;

+  int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)

+                ? cpi->initial_mbs : cpi->common.MBs;

-  // TODO(paulwilkins): correct for dead zone

+  // Correct for any inactive zone in the image

+  inactive_pct = (this_frame->intra_skip_pct / 2) +

+                 ((this_frame->inactive_zone_rows * 2) / (double)cm->mb_rows);

+  inactive_pct = fclamp(inactive_pct, 0.0, 0.5);

+  num_mbs = (int)MAX(1, num_mbs - (num_mbs * inactive_pct));

   // Underlying boost factor is based on inter error ratio.

   frame_boost = (BASELINE_ERR_PER_MB * num_mbs) /