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Add dist scale in get_mv_dist

Add MACRO VP9_DIST_SCALE_LOG2 represents distortion's log scale

Change-Id: Ic496a31e6d3f04626510f8c4661af464a002e361

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -6146,7 +6146,7 @@

     // TODO(angiebird): Consider subpixel when computing the sse.

     cpi->fn_ptr[bsize].vf(src.buf, src.stride, get_buf_from_mv(&pre, &full_mv),

                           pre.stride, &sse);

-    return (double)sse;

+    return (double)(sse << VP9_DIST_SCALE_LOG2);

   } else {

     assert(0);

     return 0;

--- a/vp9/encoder/vp9_rd.h

+++ b/vp9/encoder/vp9_rd.h

@@ -42,6 +42,9 @@

 #define RD_THRESH_MAX_FACT 64

 #define RD_THRESH_INC 1

+#define VP9_DIST_SCALE_LOG2 4

+#define VP9_DIST_SCALE (1 << VP9_DIST_SCALE_LOG2)

+

 // This enumerator type needs to be kept aligned with the mode order in

 // const MODE_DEFINITION vp9_mode_order[MAX_MODES] used in the rd code.

 typedef enum {

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

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

@@ -273,9 +273,9 @@

   }

   *skip_txfm_sb = skip_flag;

-  *skip_sse_sb = total_sse << 4;

+  *skip_sse_sb = total_sse << VP9_DIST_SCALE_LOG2;

   *out_rate_sum = (int)rate_sum;

-  *out_dist_sum = dist_sum << 4;

+  *out_dist_sum = dist_sum << VP9_DIST_SCALE_LOG2;

 }

 #if CONFIG_VP9_HIGHBITDEPTH