60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vp10/common/tile_common.h"
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#include "vp10/common/onyxc_int.h"
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#define MIN_TILE_WIDTH_B64 4
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#define MAX_TILE_WIDTH_B64 64
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static int get_tile_offset(int idx, int mis, int log2) {
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const int sb_cols = mi_cols_aligned_to_sb(mis) >> MI_BLOCK_SIZE_LOG2;
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const int offset = ((idx * sb_cols) >> log2) << MI_BLOCK_SIZE_LOG2;
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return MIN(offset, mis);
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}
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void vp10_tile_set_row(TileInfo *tile, const VP10_COMMON *cm, int row) {
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tile->mi_row_start = get_tile_offset(row, cm->mi_rows, cm->log2_tile_rows);
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tile->mi_row_end = get_tile_offset(row + 1, cm->mi_rows, cm->log2_tile_rows);
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}
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void vp10_tile_set_col(TileInfo *tile, const VP10_COMMON *cm, int col) {
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tile->mi_col_start = get_tile_offset(col, cm->mi_cols, cm->log2_tile_cols);
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tile->mi_col_end = get_tile_offset(col + 1, cm->mi_cols, cm->log2_tile_cols);
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}
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void vp10_tile_init(TileInfo *tile, const VP10_COMMON *cm, int row, int col) {
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vp10_tile_set_row(tile, cm, row);
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vp10_tile_set_col(tile, cm, col);
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}
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static int get_min_log2_tile_cols(const int sb64_cols) {
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int min_log2 = 0;
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while ((MAX_TILE_WIDTH_B64 << min_log2) < sb64_cols)
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++min_log2;
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return min_log2;
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}
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static int get_max_log2_tile_cols(const int sb64_cols) {
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int max_log2 = 1;
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while ((sb64_cols >> max_log2) >= MIN_TILE_WIDTH_B64)
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++max_log2;
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return max_log2 - 1;
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}
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void vp10_get_tile_n_bits(int mi_cols,
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int *min_log2_tile_cols, int *max_log2_tile_cols) {
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const int sb64_cols = mi_cols_aligned_to_sb(mi_cols) >> MI_BLOCK_SIZE_LOG2;
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*min_log2_tile_cols = get_min_log2_tile_cols(sb64_cols);
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*max_log2_tile_cols = get_max_log2_tile_cols(sb64_cols);
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assert(*min_log2_tile_cols <= *max_log2_tile_cols);
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}
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