libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_tile_common.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "vp9/common/vp9_tile_common.h"
 
 #include "vp9/common/vp9_onyxc_int.h"
 
 #define MIN_TILE_WIDTH_B64 4
 #define MAX_TILE_WIDTH_B64 64
 
 static int get_tile_offset(int idx, int mis, int log2) {
   const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2;
   const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2;
   return MIN(offset, mis);
 }
 
-void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
+void vp9_tile_set_row(TileInfo *tile, const VP9_COMMON *cm, int row) {
   tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows);
   tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows);
+}
+
+void vp9_tile_set_col(TileInfo *tile, const VP9_COMMON *cm, int col) {
   tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
   tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
 }
 
+void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
+  vp9_tile_set_row(tile, cm, row);
+  vp9_tile_set_col(tile, cm, col);
+}
+
 void vp9_get_tile_n_bits(int mi_cols,
                          int *min_log2_tile_cols, int *max_log2_tile_cols) {
   const int sb_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
   int min_log2 = 0, max_log2 = 0;
 
   // max
   while ((sb_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
     ++max_log2;
   --max_log2;
   if (max_log2 < 0)
     max_log2 = 0;
 
   // min
   while ((MAX_TILE_WIDTH_B64 << min_log2) < sb_cols)
     ++min_log2;
 
   assert(min_log2 <= max_log2);
 
   *min_log2_tile_cols = min_log2;
   *max_log2_tile_cols = max_log2;
 }