/*

 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.

 *

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

 */

#include <limits.h>

#include "aom_mem/aom_mem.h"

#include "av1/common/pred_common.h"

#include "av1/common/tile_common.h"

#include "av1/encoder/cost.h"

#include "av1/encoder/segmentation.h"

void av1_enable_segmentation(struct segmentation *seg) {

  seg->enabled = 1;

  seg->update_map = 1;

  seg->update_data = 1;

  seg->temporal_update = 0;

}

void av1_disable_segmentation(struct segmentation *seg) {

  seg->enabled = 0;

  seg->update_map = 0;

  seg->update_data = 0;

  seg->temporal_update = 0;

}

void av1_reuse_ref_segment_features(AV1_COMMON *cm) {

  struct segmentation *const seg = &cm->seg;

  const RefCntBuffer *const ref = cm->prev_frame;

  // Frames without a primary reference frame always send the features.

  if (!seg->update_data || cm->features.primary_ref_frame == PRIMARY_REF_NONE ||

      ref == NULL || !ref->seg.enabled) {

    return;

  }

  for (int i = 0; i < MAX_SEGMENTS; i++) {

    if (seg->feature_mask[i] != ref->seg.feature_mask[i]) return;

    for (int j = 0; j < SEG_LVL_MAX; j++) {

      if (segfeature_active(seg, i, j) &&

          get_segdata(seg, i, j) != get_segdata(&ref->seg, i, j)) {

        return;

      }

    }

  }

  seg->update_data = 0;

}

void av1_disable_segfeature(struct segmentation *seg, int segment_id,

                            SEG_LVL_FEATURES feature_id) {

  seg->feature_mask[segment_id] &= ~(1u << feature_id);

}

void av1_clear_segdata(struct segmentation *seg, int segment_id,

                       SEG_LVL_FEATURES feature_id) {

  seg->feature_data[segment_id][feature_id] = 0;

}

void av1_reset_segment_features(AV1_COMMON *cm) {

  struct segmentation *seg = &cm->seg;

  // Set up default state for MB feature flags

  seg->enabled = 0;

  seg->update_map = 0;

  seg->update_data = 0;

  av1_clearall_segfeatures(seg);

}