Assert no mv clamping for scaled references

Under --enable-better-hw-compabibility, this commit adds the asserts
that no mv clamping is applied for scaled references, so when built
with this configure option, decoder will assert if an input bitstream
triggger mv clamping for scaled reference frames.

Change-Id: I786e86a2bbbfb5bc2d2b706a31b0ffa8fe2eb0cb

vp9/common/vp9_reconinter.c

diff --git a/vp9/common/vp9_reconinter.c b/vp9/common/vp9_reconinter.c
index 3eb19b1..37658dc 100644
--- a/vp9/common/vp9_reconinter.c
+++ b/vp9/common/vp9_reconinter.c
@@ -187,13 +187,15 @@
     const int is_scaled = vp9_is_scaled(sf);
 
     if (is_scaled) {
-#if CONFIG_BETTER_HW_COMPATIBILITY
-      assert(xd->mi[0]->mbmi.sb_type != BLOCK_4X8 &&
-             xd->mi[0]->mbmi.sb_type != BLOCK_8X4);
-#endif
       // Co-ordinate of containing block to pixel precision.
       const int x_start = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x));
       const int y_start = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y));
+#if CONFIG_BETTER_HW_COMPATIBILITY
+      assert(xd->mi[0]->mbmi.sb_type != BLOCK_4X8 &&
+             xd->mi[0]->mbmi.sb_type != BLOCK_8X4);
+      assert(mv_q4.row == mv.row * (1 << (1 - pd->subsampling_y)) &&
+             mv_q4.col == mv.col * (1 << (1 - pd->subsampling_x)));
+#endif
       if (plane == 0)
         pre_buf->buf = xd->block_refs[ref]->buf->y_buffer;
       else if (plane == 1)

vp9/decoder/vp9_decodeframe.c

diff --git a/vp9/decoder/vp9_decodeframe.c b/vp9/decoder/vp9_decodeframe.c
index 39e4dcf..3fd87cc 100644
--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c
@@ -587,7 +587,12 @@
     // Co-ordinate of containing block to pixel precision.
     int x_start = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x));
     int y_start = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y));
-
+#if CONFIG_BETTER_HW_COMPATIBILITY
+    assert(xd->mi[0]->mbmi.sb_type != BLOCK_4X8 &&
+           xd->mi[0]->mbmi.sb_type != BLOCK_8X4);
+    assert(mv_q4.row == mv->row * (1 << (1 - pd->subsampling_y)) &&
+           mv_q4.col == mv->col * (1 << (1 - pd->subsampling_x)));
+#endif
     // Co-ordinate of the block to 1/16th pixel precision.
     x0_16 = (x_start + x) << SUBPEL_BITS;
     y0_16 = (y_start + y) << SUBPEL_BITS;