1 /*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "vp9/common/vp9_tile_common.h"
12
13 #include "vp9/common/vp9_onyxc_int.h"
14
15 #define MIN_TILE_WIDTH_B64 4
16 #define MAX_TILE_WIDTH_B64 64
17
get_tile_offset(int idx,int mis,int log2)18 static int get_tile_offset(int idx, int mis, int log2) {
19 const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2;
20 const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2;
21 return MIN(offset, mis);
22 }
23
vp9_tile_init(TileInfo * tile,const VP9_COMMON * cm,int row,int col)24 void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
25 tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows);
26 tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows);
27 tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
28 tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
29 }
30
vp9_get_tile_n_bits(int mi_cols,int * min_log2_tile_cols,int * max_log2_tile_cols)31 void vp9_get_tile_n_bits(int mi_cols,
32 int *min_log2_tile_cols, int *max_log2_tile_cols) {
33 const int sb_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
34 int min_log2 = 0, max_log2 = 0;
35
36 // max
37 while ((sb_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
38 ++max_log2;
39 --max_log2;
40 if (max_log2 < 0)
41 max_log2 = 0;
42
43 // min
44 while ((MAX_TILE_WIDTH_B64 << min_log2) < sb_cols)
45 ++min_log2;
46
47 assert(min_log2 <= max_log2);
48
49 *min_log2_tile_cols = min_log2;
50 *max_log2_tile_cols = max_log2;
51 }
52