Add highbitdepth function for vp9_avg_8x8

Cherry-picked from https://gerrit.chromium.org/gerrit/#/c/71914/
(a92f987a) on highbitdepth branch.

Change-Id: I6903e4e4cb57d90590725c8a1c64c23da7ae65e8

vp9/common/vp9_rtcd_defs.pl

@@ -1114,6 +1114,11 @@ specialize qw/vp9_get_mb_ss/, "$sse2_x86inc";
 add_proto qw/unsigned int vp9_avg_8x8/, "const uint8_t *, int p";
 specialize qw/vp9_avg_8x8 sse2/;
 
+if (vpx_config("CONFIG_VP9_HIGHBITDEPTH") eq "yes") {
+  add_proto qw/unsigned int vp9_highbd_avg_8x8/, "const uint8_t *, int p";
+  specialize qw/vp9_highbd_avg_8x8/;
+}
+
 # ENCODEMB INVOKE
 
 add_proto qw/void vp9_subtract_block/, "int rows, int cols, int16_t *diff_ptr, ptrdiff_t diff_stride, const uint8_t *src_ptr, ptrdiff_t src_stride, const uint8_t *pred_ptr, ptrdiff_t pred_stride";

vp9/encoder/vp9_avg.c

@@ -7,6 +7,7 @@
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
+#include "vp9/common/vp9_common.h"
 #include "vpx_ports/mem.h"
 
 unsigned int vp9_avg_8x8_c(const uint8_t *s, int p) {
@@ -17,3 +18,16 @@ unsigned int vp9_avg_8x8_c(const uint8_t *s, int p) {
 
   return (sum + 32) >> 6;
 }
+
+#if CONFIG_VP9_HIGHBITDEPTH
+unsigned int vp9_highbd_avg_8x8_c(const uint8_t *s8, int p) {
+  int i, j;
+  int sum = 0;
+  const uint16_t* s = CONVERT_TO_SHORTPTR(s8);
+  for (i = 0; i < 8; ++i, s+=p)
+    for (j = 0; j < 8; sum += s[j], ++j) {}
+
+  return (sum + 32) >> 6;
+}
+#endif  // CONFIG_VP9_HIGHBITDEPTH
+

vp9/encoder/vp9_encodeframe.c

@@ -533,8 +533,19 @@ static void choose_partitioning(VP9_COMP *cpi,
         int sum = 0;
 
         if (x_idx < pixels_wide && y_idx < pixels_high) {
-          int s_avg = vp9_avg_8x8(s + y_idx * sp + x_idx, sp);
-          int d_avg = vp9_avg_8x8(d + y_idx * dp + x_idx, dp);
+          int s_avg, d_avg;
+#if CONFIG_VP9_HIGHBITDEPTH
+          if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+            s_avg = vp9_highbd_avg_8x8(s + y_idx * sp + x_idx, sp);
+            d_avg = vp9_highbd_avg_8x8(d + y_idx * dp + x_idx, dp);
+          } else {
+            s_avg = vp9_avg_8x8(s + y_idx * sp + x_idx, sp);
+            d_avg = vp9_avg_8x8(d + y_idx * dp + x_idx, dp);
+          }
+#else
+          s_avg = vp9_avg_8x8(s + y_idx * sp + x_idx, sp);
+          d_avg = vp9_avg_8x8(d + y_idx * dp + x_idx, dp);
+#endif
           sum = s_avg - d_avg;
           sse = sum * sum;
         }