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
26void vp9_init_neighbors();
27
28typedef struct {
29  const int16_t *scan;
30  const int16_t *iscan;
31  const int16_t *neighbors;
32} scan_order;
33
34extern const scan_order vp9_default_scan_orders[TX_SIZES];
35extern const scan_order vp9_scan_orders[TX_SIZES][TX_TYPES];
36
37static INLINE int get_coef_context(const int16_t *neighbors,
38                                   const uint8_t *token_cache, int c) {
39  return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
40          token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >> 1;
41}
42
43#ifdef __cplusplus
44}  // extern "C"
45#endif
46
47#endif  // VP9_COMMON_VP9_SCAN_H_
48