intrabc: add assertions for DV subpel

DV and ref DV should not have subpel values.

Change-Id: I7c47c442936f1d6bda36314812c44498ba6195a6

av1/decoder/decodemv.c

@@ -991,6 +991,11 @@ static INLINE int assign_dv(AV1_COMMON *cm, MACROBLOCKD *xd, int_mv *mv,
   nmv_context_counts *const dv_counts = counts ? &counts->dv : NULL;
   read_mv(r, &mv->as_mv, &ref_mv->as_mv, &ec_ctx->ndvc, dv_counts,
           MV_SUBPEL_NONE);
+  // DV should not have sub-pel.
+  assert((mv->as_mv.col & 7) == 0);
+  assert((mv->as_mv.row & 7) == 0);
+  mv->as_mv.col = (mv->as_mv.col >> 3) << 3;
+  mv->as_mv.row = (mv->as_mv.row >> 3) << 3;
   int valid = is_mv_valid(&mv->as_mv) &&
               is_dv_valid(mv->as_mv, &xd->tile, mi_row, mi_col, bsize);
   return valid;
@@ -1048,6 +1053,11 @@ static void read_intrabc_info(AV1_COMMON *const cm, MACROBLOCKD *const xd,
 #endif
     int_mv dv_ref = nearestmv.as_int == 0 ? nearmv : nearestmv;
     if (dv_ref.as_int == 0) av1_find_ref_dv(&dv_ref, mi_row, mi_col);
+    // Ref DV should not have sub-pel.
+    assert((dv_ref.as_mv.col & 7) == 0);
+    assert((dv_ref.as_mv.row & 7) == 0);
+    dv_ref.as_mv.col = (dv_ref.as_mv.col >> 3) << 3;
+    dv_ref.as_mv.row = (dv_ref.as_mv.row >> 3) << 3;
     xd->corrupted |=
         !assign_dv(cm, xd, &mbmi->mv[0], &dv_ref, mi_row, mi_col, bsize, r);
 #if !CONFIG_TXK_SEL

av1/encoder/encodemv.c

@@ -217,6 +217,11 @@ void av1_encode_mv(AV1_COMP *cpi, aom_writer *w, const MV *mv, const MV *ref,
 #if CONFIG_INTRABC
 void av1_encode_dv(aom_writer *w, const MV *mv, const MV *ref,
                    nmv_context *mvctx) {
+  // DV and ref DV should not have sub-pel.
+  assert((mv->col & 7) == 0);
+  assert((mv->row & 7) == 0);
+  assert((ref->col & 7) == 0);
+  assert((ref->row & 7) == 0);
   const MV diff = { mv->row - ref->row, mv->col - ref->col };
   const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
 

av1/encoder/rdopt.c

@@ -8778,6 +8778,9 @@ static int64_t rd_pick_intrabc_mode_sb(const AV1_COMP *cpi, MACROBLOCK *x,
 
   int_mv dv_ref = nearestmv.as_int == 0 ? nearmv : nearestmv;
   if (dv_ref.as_int == 0) av1_find_ref_dv(&dv_ref, mi_row, mi_col);
+  // Ref DV should not have sub-pel.
+  assert((dv_ref.as_mv.col & 7) == 0);
+  assert((dv_ref.as_mv.row & 7) == 0);
   mbmi_ext->ref_mvs[INTRA_FRAME][0] = dv_ref;
 
   struct buf_2d yv12_mb[MAX_MB_PLANE];
@@ -8855,6 +8858,9 @@ static int64_t rd_pick_intrabc_mode_sb(const AV1_COMP *cpi, MACROBLOCK *x,
     if (mv_check_bounds(&x->mv_limits, &dv)) continue;
     if (!is_dv_valid(dv, tile, mi_row, mi_col, bsize)) continue;
 
+    // DV should not have sub-pel.
+    assert((dv.col & 7) == 0);
+    assert((dv.row & 7) == 0);
     memset(&mbmi->palette_mode_info, 0, sizeof(mbmi->palette_mode_info));
     mbmi->use_intrabc = 1;
     mbmi->mode = DC_PRED;