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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 get_tile_offset(int idx, int mis, int log2) {
const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2;
const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2;
return MIN(offset, mis);
}
void vp9_tile_set_row(TileInfo *tile, const VP9_COMMON *cm, int row) {
tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows);
tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows);
}
void vp9_tile_set_col(TileInfo *tile, const VP9_COMMON *cm, int col) {
tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
}
void vp9_tile_init(TileInfo *tile, const VP9_COMMON *cm, int row, int col) {
vp9_tile_set_row(tile, cm, row);
vp9_tile_set_col(tile, cm, col);
}
static int get_min_log2_tile_cols(const int sb64_cols) {
int min_log2 = 0;
while ((MAX_TILE_WIDTH_B64 << min_log2) < sb64_cols)
++min_log2;
return min_log2;
}
static int get_max_log2_tile_cols(const int sb64_cols) {
int max_log2 = 1;
while ((sb64_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
++max_log2;
return max_log2 - 1;
}
void vp9_get_tile_n_bits(int mi_cols,
int *min_log2_tile_cols, int *max_log2_tile_cols) {
const int sb64_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
*min_log2_tile_cols = get_min_log2_tile_cols(sb64_cols);
*max_log2_tile_cols = get_max_log2_tile_cols(sb64_cols);
assert(*min_log2_tile_cols <= *max_log2_tile_cols);
}
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