Turn off palette when enabling intrabc

Change-Id: I109e382097a8fcbf85a339f97f6297252f01b021

av1/encoder/bitstream.c

@@ -2318,6 +2318,9 @@ static void write_tokens_b(AV1_COMP *cpi, const TileInfo *const tile,
     const uint8_t palette_size_plane =
         mbmi->palette_mode_info.palette_size[plane];
     if (palette_size_plane > 0) {
+#if CONFIG_INTRABC
+      assert(mbmi->use_intrabc == 0);
+#endif
       int rows, cols;
       assert(mbmi->sb_type >= BLOCK_8X8);
       av1_get_block_dimensions(mbmi->sb_type, plane, xd, NULL, NULL, &rows,

av1/encoder/rdopt.c

@@ -9138,6 +9138,9 @@ static int64_t rd_pick_intrabc_mode_sb(const AV1_COMP *cpi, MACROBLOCK *x,
   if (bsize >= BLOCK_8X8 && cpi->common.allow_screen_content_tools) {
     if (xd->mb_to_top_edge == -MAX_SB_SIZE * 8) {
       MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
+#if CONFIG_PALETTE
+      memset(&mbmi->palette_mode_info, 0, sizeof(mbmi->palette_mode_info));
+#endif
       mbmi->use_intrabc = 1;
       mbmi->mode = DC_PRED;
       mbmi->uv_mode = DC_PRED;