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 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 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 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 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 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) ++min_log2; 42 return min_log2; 43 } 44 45 static int get_max_log2_tile_cols(const int sb64_cols) { 46 int max_log2 = 1; 47 while ((sb64_cols >> max_log2) >= MIN_TILE_WIDTH_B64) ++max_log2; 48 return max_log2 - 1; 49 } 50 51 void vp9_get_tile_n_bits(int mi_cols, int *min_log2_tile_cols, 52 int *max_log2_tile_cols) { 53 const int sb64_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2; 54 *min_log2_tile_cols = get_min_log2_tile_cols(sb64_cols); 55 *max_log2_tile_cols = get_max_log2_tile_cols(sb64_cols); 56 assert(*min_log2_tile_cols <= *max_log2_tile_cols); 57 } 58
