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Enable using fast HEX search in non-rd pick mode

Added fast HEX search while doing non-rd partition picking to
speed up the encoder.

Borg test(speed 7) on rtc set showed 1.8% overall PSNR loss.
Encoder speedup was 5% - 15% for different rtc clips.

Change-Id: I9c83026eabc70b69fcc747c90369ec60bfa3ca24

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -98,8 +98,15 @@

   mvp_full.col >>= 3;

   mvp_full.row >>= 3;

-  vp9_full_pixel_diamond(cpi, x, &mvp_full, step_param, sadpb, further_steps, 1,

-                         &cpi->fn_ptr[bsize], &ref_mv.as_mv, &tmp_mv->as_mv);

+  if (cpi->sf.search_method == FAST_HEX) {

+    vp9_fast_hex_search(x, &mvp_full, step_param, sadpb, &cpi->fn_ptr[bsize],

+                        1, &ref_mv.as_mv, &tmp_mv->as_mv);

+  } else {

+    vp9_full_pixel_diamond(cpi, x, &mvp_full, step_param, sadpb, further_steps,

+                           1, &cpi->fn_ptr[bsize], &ref_mv.as_mv,

+                           &tmp_mv->as_mv);

+  }

+

   x->mv_col_min = tmp_col_min;

   x->mv_col_max = tmp_col_max;

   x->mv_row_min = tmp_row_min;

-- 

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