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/*
* 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"
#define MIN_TILE_WIDTH 256
#define MAX_TILE_WIDTH 4096
#define MIN_TILE_WIDTH_SBS (MIN_TILE_WIDTH >> 6)
#define MAX_TILE_WIDTH_SBS (MAX_TILE_WIDTH >> 6)
static void vp9_get_tile_offsets(VP9_COMMON *cm, int *min_tile_off,
int *max_tile_off, int tile_idx,
int log2_n_tiles, int n_mbs) {
const int n_sbs = (n_mbs + 3) >> 2;
const int sb_off1 = (tile_idx * n_sbs) >> log2_n_tiles;
const int sb_off2 = ((tile_idx + 1) * n_sbs) >> log2_n_tiles;
*min_tile_off = (sb_off1 << 2) > n_mbs ? n_mbs : (sb_off1 << 2);
*max_tile_off = (sb_off2 << 2) > n_mbs ? n_mbs : (sb_off2 << 2);
}
void vp9_get_tile_col_offsets(VP9_COMMON *cm, int tile_col_idx) {
cm->cur_tile_col_idx = tile_col_idx;
vp9_get_tile_offsets(cm, &cm->cur_tile_mb_col_start,
&cm->cur_tile_mb_col_end, tile_col_idx,
cm->log2_tile_columns, cm->mb_cols);
}
void vp9_get_tile_row_offsets(VP9_COMMON *cm, int tile_row_idx) {
cm->cur_tile_row_idx = tile_row_idx;
vp9_get_tile_offsets(cm, &cm->cur_tile_mb_row_start,
&cm->cur_tile_mb_row_end, tile_row_idx,
cm->log2_tile_rows, cm->mb_rows);
}
void vp9_get_tile_n_bits(VP9_COMMON *cm, int *min_log2_n_tiles_ptr,
int *delta_log2_n_tiles) {
const int sb_cols = (cm->mb_cols + 3) >> 2;
int min_log2_n_tiles, max_log2_n_tiles;
for (max_log2_n_tiles = 0;
(sb_cols >> max_log2_n_tiles) >= MIN_TILE_WIDTH_SBS;
max_log2_n_tiles++) {}
for (min_log2_n_tiles = 0;
(MAX_TILE_WIDTH_SBS << min_log2_n_tiles) < sb_cols;
min_log2_n_tiles++) {}
*min_log2_n_tiles_ptr = min_log2_n_tiles;
*delta_log2_n_tiles = max_log2_n_tiles - min_log2_n_tiles;
}
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