/*****************************************************************************
 * This file is part of Kvazaar HEVC encoder.
 *
 * Copyright (C) 2013-2014 Tampere University of Technology and others (see
 * COPYING file).
 *
 * Kvazaar is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * Kvazaar is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/

#include "encoder_state-geometry.h"

#include "encoderstate.h"



int lcu_at_slice_start(const encoder_control * const encoder, int lcu_addr_in_ts) {
  int i;
  assert(lcu_addr_in_ts >= 0 && lcu_addr_in_ts < encoder->in.height_in_lcu * encoder->in.width_in_lcu);
  if (lcu_addr_in_ts == 0) return 1;
  for (i = 0; i < encoder->slice_count; ++i) {
    if (encoder->slice_addresses_in_ts[i] == lcu_addr_in_ts) return 1;
  }
  return 0;
}

int lcu_at_slice_end(const encoder_control * const encoder, int lcu_addr_in_ts) {
  int i;
  assert(lcu_addr_in_ts >= 0 && lcu_addr_in_ts < encoder->in.height_in_lcu * encoder->in.width_in_lcu);
  if (lcu_addr_in_ts == encoder->in.height_in_lcu * encoder->in.width_in_lcu - 1) return 1;
  for (i = 0; i < encoder->slice_count; ++i) {
    if (encoder->slice_addresses_in_ts[i] == lcu_addr_in_ts + 1) return 1;
  }
  return 0;
}

int lcu_at_tile_start(const encoder_control * const encoder, int lcu_addr_in_ts) {
  assert(lcu_addr_in_ts >= 0 && lcu_addr_in_ts < encoder->in.height_in_lcu * encoder->in.width_in_lcu);
  if (lcu_addr_in_ts == 0) return 1;
  if (encoder->tiles_tile_id[lcu_addr_in_ts - 1] != encoder->tiles_tile_id[lcu_addr_in_ts]) {
    return 1;
  }
  return 0;
}

int lcu_at_tile_end(const encoder_control * const encoder, int lcu_addr_in_ts) {
  assert(lcu_addr_in_ts >= 0 && lcu_addr_in_ts < encoder->in.height_in_lcu * encoder->in.width_in_lcu);
  if (lcu_addr_in_ts == encoder->in.height_in_lcu * encoder->in.width_in_lcu - 1) return 1;
  if (encoder->tiles_tile_id[lcu_addr_in_ts + 1] != encoder->tiles_tile_id[lcu_addr_in_ts]) {
    return 1;
  }
  return 0;
}

//Return 1 if the LCU is at the first row of a structure (tile or slice)
int lcu_in_first_row(const encoder_state * const encoder_state, int lcu_addr_in_ts) {
  const int lcu_addr_in_rs = encoder_state->encoder_control->tiles_ctb_addr_ts_to_rs[lcu_addr_in_ts];

  if (lcu_addr_in_rs / encoder_state->encoder_control->in.width_in_lcu == encoder_state->tile->lcu_offset_y) {
    return 1;
  }

  if (lcu_addr_in_rs / encoder_state->encoder_control->in.width_in_lcu == encoder_state->slice->start_in_rs / encoder_state->encoder_control->in.width_in_lcu) {
    return 1;
  }

  //One row above is before the start of the slice => it's also a boundary
  if (lcu_addr_in_rs - encoder_state->encoder_control->in.width_in_lcu < encoder_state->slice->start_in_rs) {
    return 1;
  }

  return 0;
}

//Return 1 if the LCU is at the first row of a structure (tile or slice)
int lcu_in_last_row(const encoder_state * const encoder_state, int lcu_addr_in_ts) {
  const int lcu_addr_in_rs = encoder_state->encoder_control->tiles_ctb_addr_ts_to_rs[lcu_addr_in_ts];

  if (lcu_addr_in_rs / encoder_state->encoder_control->in.width_in_lcu == encoder_state->tile->lcu_offset_y + encoder_state->tile->cur_pic->height_in_lcu - 1) {
    return 1;
  }

  if (lcu_addr_in_rs / encoder_state->encoder_control->in.width_in_lcu == encoder_state->slice->end_in_rs / encoder_state->encoder_control->in.width_in_lcu) {
    return 1;
  }

  //One row below is before the end of the slice => it's also a boundary
  if (lcu_addr_in_rs + encoder_state->encoder_control->in.width_in_lcu > encoder_state->slice->end_in_rs) {
    return 1;
  }

  return 0;
}


//Return 1 if the LCU is at the first column of a structure (tile or slice)
int lcu_in_first_column(const encoder_state * const encoder_state, int lcu_addr_in_ts) {
  const int lcu_addr_in_rs = encoder_state->encoder_control->tiles_ctb_addr_ts_to_rs[lcu_addr_in_ts];

  //First column of tile?
  if (lcu_addr_in_rs % encoder_state->encoder_control->in.width_in_lcu == encoder_state->tile->lcu_offset_x) {
    return 1;
  }

  //Slice start may not be aligned with the tile, so we need to allow this
  if (lcu_addr_in_rs == encoder_state->slice->start_in_rs) {
    return 1;
  }

  return 0;
}

//Return 1 if the LCU is at the last column of a structure (tile or slice)
int lcu_in_last_column(const encoder_state * const encoder_state, int lcu_addr_in_ts) {
  const int lcu_addr_in_rs = encoder_state->encoder_control->tiles_ctb_addr_ts_to_rs[lcu_addr_in_ts];

  //First column of tile?
  if (lcu_addr_in_rs % encoder_state->encoder_control->in.width_in_lcu == encoder_state->tile->lcu_offset_x + encoder_state->tile->cur_pic->width_in_lcu - 1) {
    return 1;
  }

  //Slice start may not be aligned with the tile, so we need to allow this
  if (lcu_addr_in_rs == encoder_state->slice->end_in_rs) {
    return 1;
  }

  return 0;
}