Avoiding extra runs through skip flags

Change-Id: Ia773950145dcee58dd99cb996c4827afd554a3a9

av1/common/cdef.c

@@ -224,8 +224,12 @@ void av1_cdef_frame(YV12_BUFFER_CONFIG *frame, AV1_COMMON *cm,
       int uv_level, uv_clpf_strength;
       int nhb, nvb;
       int cstart = 0;
+      curr_row_dering[sbc] = 0;
       if (cm->mi_grid_visible[MAX_MIB_SIZE * sbr * cm->mi_stride +
-                              MAX_MIB_SIZE * sbc] == NULL) {
+                              MAX_MIB_SIZE * sbc] == NULL ||
+          cm->mi_grid_visible[MAX_MIB_SIZE * sbr * cm->mi_stride +
+                              MAX_MIB_SIZE * sbc]
+                  ->mbmi.cdef_strength == -1) {
         dering_left = 0;
         continue;
       }
@@ -266,7 +270,6 @@ void av1_cdef_frame(YV12_BUFFER_CONFIG *frame, AV1_COMMON *cm,
       uv_clpf_strength =
           cm->cdef_uv_strengths[mbmi_cdef_strength] % CLPF_STRENGTHS;
       uv_clpf_strength += uv_clpf_strength == 3;
-      curr_row_dering[sbc] = 0;
       if ((level == 0 && clpf_strength == 0 && uv_level == 0 &&
            uv_clpf_strength == 0) ||
           (dering_count = sb_compute_dering_list(

av1/decoder/decodeframe.c

@@ -2360,7 +2360,7 @@ static void decode_partition(AV1Decoder *const pbi, MACROBLOCKD *const xd,
           aom_read_literal(r, cm->cdef_bits, ACCT_STR);
     } else {
       cm->mi_grid_visible[mi_row * cm->mi_stride + mi_col]->mbmi.cdef_strength =
-          0;
+          -1;
     }
   }
 #endif  // CONFIG_CDEF

av1/encoder/pickcdef.c

@@ -378,6 +378,9 @@ void av1_cdef_search(YV12_BUFFER_CONFIG *frame, const YV12_BUFFER_CONFIG *ref,
       nvb = AOMMIN(MAX_MIB_SIZE, cm->mi_rows - MAX_MIB_SIZE * sbr);
       dering_count = sb_compute_dering_list(cm, sbr * MAX_MIB_SIZE,
                                             sbc * MAX_MIB_SIZE, dlist);
+      cm->mi_grid_visible[MAX_MIB_SIZE * sbr * cm->mi_stride +
+                          MAX_MIB_SIZE * sbc]
+          ->mbmi.cdef_strength = -1;
       if (dering_count == 0) continue;
       for (pli = 0; pli < nplanes; pli++) {
         for (i = 0; i < OD_DERING_INBUF_SIZE; i++)