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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"
#include "vp9/common/vp9_onyxc_int.h"
#define MIN_TILE_WIDTH_B64 4
#define MAX_TILE_WIDTH_B64 64
static int to_sbs(n_mis) {
return mi_cols_aligned_to_sb(n_mis) >> MI_BLOCK_SIZE_LOG2;
}
static void get_tile_offsets(int *min_tile_off, int *max_tile_off,
int tile_idx, int log2_n_tiles, int n_mis) {
const int n_sbs = to_sbs(n_mis);
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 = MIN(sb_off1 << 3, n_mis);
*max_tile_off = MIN(sb_off2 << 3, n_mis);
}
void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm,
int row_idx, int col_idx) {
get_tile_offsets(&tile->mi_row_start, &tile->mi_row_end,
row_idx, cm->log2_tile_rows, cm->mi_rows);
get_tile_offsets(&tile->mi_col_start, &tile->mi_col_end,
col_idx, cm->log2_tile_cols, cm->mi_cols);
}
void vp9_get_tile_n_bits(int mi_cols,
int *min_log2_tile_cols, int *max_log2_tile_cols) {
const int sb_cols = to_sbs(mi_cols);
int min_log2_n_tiles, max_log2_n_tiles;
for (max_log2_n_tiles = 0;
(sb_cols >> max_log2_n_tiles) >= MIN_TILE_WIDTH_B64;
max_log2_n_tiles++) {}
max_log2_n_tiles--;
if (max_log2_n_tiles < 0)
max_log2_n_tiles = 0;
for (min_log2_n_tiles = 0;
(MAX_TILE_WIDTH_B64 << min_log2_n_tiles) < sb_cols;
min_log2_n_tiles++) {}
assert(min_log2_n_tiles <= max_log2_n_tiles);
*min_log2_tile_cols = min_log2_n_tiles;
*max_log2_tile_cols = max_log2_n_tiles;
}
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