libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_scale.c

Index: source/libvpx/vp9/common/vp9_scale.c
diff --git a/source/libvpx/vp9/common/vp9_scale.c b/source/libvpx/vp9/common/vp9_scale.c
index 8f5c72e7c6c067a80411a657764fcbd8adde3db0..b763b925b3ea49ccf682e1948350dcef67fd21cd 100644
--- a/source/libvpx/vp9/common/vp9_scale.c
+++ b/source/libvpx/vp9/common/vp9_scale.c
@@ -79,6 +79,7 @@ void vp9_setup_scale_factors_for_frame(struct scale_factors *sf,
   // applied in one direction only, and not at all for 0,0, seems to give the
   // best quality, but it may be worth trying an additional mode that does
   // do the filtering on full-pel.
+
   if (sf->x_step_q4 == 16) {
     if (sf->y_step_q4 == 16) {
       // No scaling in either direction.
@@ -90,35 +91,43 @@ void vp9_setup_scale_factors_for_frame(struct scale_factors *sf,
       sf->predict[1][0][1] = vpx_convolve8_avg_horiz;
     } else {
       // No scaling in x direction. Must always scale in the y direction.
-      sf->predict[0][0][0] = vpx_convolve8_vert;
-      sf->predict[0][0][1] = vpx_convolve8_avg_vert;
-      sf->predict[0][1][0] = vpx_convolve8_vert;
-      sf->predict[0][1][1] = vpx_convolve8_avg_vert;
-      sf->predict[1][0][0] = vpx_convolve8;
-      sf->predict[1][0][1] = vpx_convolve8_avg;
+      sf->predict[0][0][0] = vpx_scaled_vert;
+      sf->predict[0][0][1] = vpx_scaled_avg_vert;
+      sf->predict[0][1][0] = vpx_scaled_vert;
+      sf->predict[0][1][1] = vpx_scaled_avg_vert;
+      sf->predict[1][0][0] = vpx_scaled_2d;
+      sf->predict[1][0][1] = vpx_scaled_avg_2d;
     }
   } else {
     if (sf->y_step_q4 == 16) {
       // No scaling in the y direction. Must always scale in the x direction.
-      sf->predict[0][0][0] = vpx_convolve8_horiz;
-      sf->predict[0][0][1] = vpx_convolve8_avg_horiz;
-      sf->predict[0][1][0] = vpx_convolve8;
-      sf->predict[0][1][1] = vpx_convolve8_avg;
-      sf->predict[1][0][0] = vpx_convolve8_horiz;
-      sf->predict[1][0][1] = vpx_convolve8_avg_horiz;
+      sf->predict[0][0][0] = vpx_scaled_horiz;
+      sf->predict[0][0][1] = vpx_scaled_avg_horiz;
+      sf->predict[0][1][0] = vpx_scaled_2d;
+      sf->predict[0][1][1] = vpx_scaled_avg_2d;
+      sf->predict[1][0][0] = vpx_scaled_horiz;
+      sf->predict[1][0][1] = vpx_scaled_avg_horiz;
     } else {
       // Must always scale in both directions.
-      sf->predict[0][0][0] = vpx_convolve8;
-      sf->predict[0][0][1] = vpx_convolve8_avg;
-      sf->predict[0][1][0] = vpx_convolve8;
-      sf->predict[0][1][1] = vpx_convolve8_avg;
-      sf->predict[1][0][0] = vpx_convolve8;
-      sf->predict[1][0][1] = vpx_convolve8_avg;
+      sf->predict[0][0][0] = vpx_scaled_2d;
+      sf->predict[0][0][1] = vpx_scaled_avg_2d;
+      sf->predict[0][1][0] = vpx_scaled_2d;
+      sf->predict[0][1][1] = vpx_scaled_avg_2d;
+      sf->predict[1][0][0] = vpx_scaled_2d;
+      sf->predict[1][0][1] = vpx_scaled_avg_2d;
     }
   }
+
   // 2D subpel motion always gets filtered in both directions
-  sf->predict[1][1][0] = vpx_convolve8;
-  sf->predict[1][1][1] = vpx_convolve8_avg;
+
+  if ((sf->x_step_q4 != 16) || (sf->y_step_q4 != 16)) {
+    sf->predict[1][1][0] = vpx_scaled_2d;
+    sf->predict[1][1][1] = vpx_scaled_avg_2d;
+  } else {
+    sf->predict[1][1][0] = vpx_convolve8;
+    sf->predict[1][1][1] = vpx_convolve8_avg;
+  }
+
 #if CONFIG_VP9_HIGHBITDEPTH
   if (use_highbd) {
     if (sf->x_step_q4 == 16) {