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 18static 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 24void 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 31void 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