1/*
2 *  Copyright (c) 2013 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#ifndef VP9_COMMON_VP9_SCAN_H_
12#define VP9_COMMON_VP9_SCAN_H_
13
14#include "vpx/vpx_integer.h"
15#include "vpx_ports/mem.h"
16
17#include "vp9/common/vp9_enums.h"
18#include "vp9/common/vp9_blockd.h"
19
20#ifdef __cplusplus
21extern "C" {
22#endif
23
24#define MAX_NEIGHBORS 2
25
26typedef struct {
27  const int16_t *scan;
28  const int16_t *iscan;
29  const int16_t *neighbors;
30} scan_order;
31
32extern const scan_order vp9_default_scan_orders[TX_SIZES];
33extern const scan_order vp9_scan_orders[TX_SIZES][TX_TYPES];
34
35static INLINE int get_coef_context(const int16_t *neighbors,
36                                   const uint8_t *token_cache, int c) {
37  return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
38          token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >>
39         1;
40}
41
42static INLINE const scan_order *get_scan(const MACROBLOCKD *xd, TX_SIZE tx_size,
43                                         PLANE_TYPE type, int block_idx) {
44  const MODE_INFO *const mi = xd->mi[0];
45
46  if (is_inter_block(mi) || type != PLANE_TYPE_Y || xd->lossless) {
47    return &vp9_default_scan_orders[tx_size];
48  } else {
49    const PREDICTION_MODE mode = get_y_mode(mi, block_idx);
50    return &vp9_scan_orders[tx_size][intra_mode_to_tx_type_lookup[mode]];
51  }
52}
53
54#ifdef __cplusplus
55}  // extern "C"
56#endif
57
58#endif  // VP9_COMMON_VP9_SCAN_H_
59