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 21 extern "C" { 22 #endif 23 24 #define MAX_NEIGHBORS 2 25 26 typedef struct { 27 const int16_t *scan; 28 const int16_t *iscan; 29 const int16_t *neighbors; 30 } scan_order; 31 32 extern const scan_order vp9_default_scan_orders[TX_SIZES]; 33 extern const scan_order vp9_scan_orders[TX_SIZES][TX_TYPES]; 34 35 static 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 42 static 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
