/*
 *  Copyright (c) 2010 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_LOOPFILTER_H_
#define VP9_COMMON_VP9_LOOPFILTER_H_

#include "vpx_ports/mem.h"
#include "./vpx_config.h"

#include "vp9/common/vp9_seg_common.h"

#ifdef __cplusplus
extern "C" {
#endif

#define MAX_LOOP_FILTER 63
#define MAX_SHARPNESS 7

#define SIMD_WIDTH 1

#define MAX_REF_LF_DELTAS 4
#define MAX_MODE_LF_DELTAS 2

#define NONE -1
#define INTRA_FRAME 0
#define LAST_FRAME 1
#define GOLDEN_FRAME 2
#define ALTREF_FRAME 3
#define MAX_REF_FRAMES 4

enum lf_path {
  LF_PATH_420,
  LF_PATH_444,
  LF_PATH_SLOW,
};

// Need to align this structure so when it is declared and
// passed it can be loaded into vector registers.
typedef struct {
  DECLARE_ALIGNED(SIMD_WIDTH, uint8_t, mblim[SIMD_WIDTH]);
  DECLARE_ALIGNED(SIMD_WIDTH, uint8_t, lim[SIMD_WIDTH]);
  DECLARE_ALIGNED(SIMD_WIDTH, uint8_t, hev_thr[SIMD_WIDTH]);
} loop_filter_thresh;

typedef struct loop_filter_info_n {
  loop_filter_thresh lfthr[MAX_LOOP_FILTER + 1];
  uint8_t lvl[MAX_SEGMENTS][MAX_REF_FRAMES][MAX_MODE_LF_DELTAS];
} loop_filter_info_n;

// This structure holds bit masks for all 8x8 blocks in a 64x64 region.
// Each 1 bit represents a position in which we want to apply the loop filter.
// Left_ entries refer to whether we apply a filter on the border to the
// left of the block.   Above_ entries refer to whether or not to apply a
// filter on the above border.   Int_ entries refer to whether or not to
// apply borders on the 4x4 edges within the 8x8 block that each bit
// represents.
// Since each transform is accompanied by a potentially different type of
// loop filter there is a different entry in the array for each transform size.
typedef struct {
  uint64_t left_y[TX_SIZES];
  uint64_t above_y[TX_SIZES];
  uint64_t int_4x4_y;
  uint16_t left_uv[TX_SIZES];
  uint16_t above_uv[TX_SIZES];
  uint16_t int_4x4_uv;
  uint8_t lfl_y[64];
} LOOP_FILTER_MASK;

struct loopfilter {
  int filter_level;
  int last_filt_level;

  int sharpness_level;
  int last_sharpness_level;

  uint8_t mode_ref_delta_enabled;
  uint8_t mode_ref_delta_update;

  // 0 = Intra, Last, GF, ARF
  signed char ref_deltas[MAX_REF_LF_DELTAS];
  signed char last_ref_deltas[MAX_REF_LF_DELTAS];

  // 0 = ZERO_MV, MV
  signed char mode_deltas[MAX_MODE_LF_DELTAS];
  signed char last_mode_deltas[MAX_MODE_LF_DELTAS];

  LOOP_FILTER_MASK *lfm;
  int lfm_stride;
};

void vp9_loop_filter_init(loop_filter_info_n *lfi, struct loopfilter *lf);
void vp9_loop_filter_frame_init(struct loopfilter *lf, loop_filter_info_n *lfi,
                                struct segmentation *seg, int default_filt_lvl,
                                bool *sharpness_updated_out);

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VP9_COMMON_VP9_LOOPFILTER_H_