shithub: libvpx

ref: 2f52decd22ca02187ccc9f5d88bd4f5bc921b47d
dir: /vp9/common/vp9_scan.h/

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/*
 *  Copyright (c) 2013 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.
 */

#ifndef VP9_COMMON_VP9_SCAN_H_
#define VP9_COMMON_VP9_SCAN_H_

#include "vpx/vpx_integer.h"
#include "vpx_ports/mem.h"

#include "vp9/common/vp9_enums.h"
#include "vp9/common/vp9_blockd.h"

#define MAX_NEIGHBORS 2

void vp9_init_neighbors();

typedef struct {
  const int16_t *scan;
  const int16_t *iscan;
  const int16_t *neighbors;
} scan_order;

extern const scan_order vp9_default_scan_orders[TX_SIZES];
extern const scan_order vp9_scan_orders[TX_SIZES][TX_TYPES];

static INLINE int get_coef_context(const int16_t *neighbors,
                                   const uint8_t *token_cache, int c) {
  return (1 + token_cache[neighbors[MAX_NEIGHBORS * c + 0]] +
          token_cache[neighbors[MAX_NEIGHBORS * c + 1]]) >> 1;
}

#endif  // VP9_COMMON_VP9_SCAN_H_