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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 VPX_VP9_COMMON_VP9_SCAN_H_
#define VPX_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"
#ifdef __cplusplus
extern "C" {
#endif
#define MAX_NEIGHBORS 2
typedef struct ScanOrder {
const int16_t *scan;
const int16_t *iscan;
const int16_t *neighbors;
} ScanOrder;
extern const ScanOrder vp9_default_scan_orders[TX_SIZES];
extern const ScanOrder 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;
}
static INLINE const ScanOrder *get_scan(const MACROBLOCKD *xd, TX_SIZE tx_size,
PLANE_TYPE type, int block_idx) {
const MODE_INFO *const mi = xd->mi[0];
if (is_inter_block(mi) || type != PLANE_TYPE_Y || xd->lossless) {
return &vp9_default_scan_orders[tx_size];
} else {
const PREDICTION_MODE mode = get_y_mode(mi, block_idx);
return &vp9_scan_orders[tx_size][intra_mode_to_tx_type_lookup[mode]];
}
}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VPX_VP9_COMMON_VP9_SCAN_H_
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