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 #include "vp9/common/vp9_onyxc_int.h"
13 #include "vpx_dsp/vpx_dsp_common.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 VPXMIN(offset, mis);
22 }
23 
vp9_tile_set_row(TileInfo * tile,const VP9_COMMON * cm,int row)24 void vp9_tile_set_row(TileInfo *tile, const VP9_COMMON *cm, int row) {
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 }
28 
vp9_tile_set_col(TileInfo * tile,const VP9_COMMON * cm,int col)29 void vp9_tile_set_col(TileInfo *tile, const VP9_COMMON *cm, int col) {
30   tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
31   tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
32 }
33 
vp9_tile_init(TileInfo * tile,const VP9_COMMON * cm,int row,int col)34 void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
35   vp9_tile_set_row(tile, cm, row);
36   vp9_tile_set_col(tile, cm, col);
37 }
38 
get_min_log2_tile_cols(const int sb64_cols)39 static int get_min_log2_tile_cols(const int sb64_cols) {
40   int min_log2 = 0;
41   while ((MAX_TILE_WIDTH_B64 << min_log2) < sb64_cols)
42     ++min_log2;
43   return min_log2;
44 }
45 
get_max_log2_tile_cols(const int sb64_cols)46 static int get_max_log2_tile_cols(const int sb64_cols) {
47   int max_log2 = 1;
48   while ((sb64_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
49     ++max_log2;
50   return max_log2 - 1;
51 }
52 
vp9_get_tile_n_bits(int mi_cols,int * min_log2_tile_cols,int * max_log2_tile_cols)53 void vp9_get_tile_n_bits(int mi_cols,
54                          int *min_log2_tile_cols, int *max_log2_tile_cols) {
55   const int sb64_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
56   *min_log2_tile_cols = get_min_log2_tile_cols(sb64_cols);
57   *max_log2_tile_cols = get_max_log2_tile_cols(sb64_cols);
58   assert(*min_log2_tile_cols <= *max_log2_tile_cols);
59 }
60