/*

 * 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 <assert.h>

#include <stdint.h>

#include <string.h>

#include "av1/common/blockd.h"

#include "av1/encoder/palette.h"

#include "av1/encoder/random.h"

#ifndef AV1_K_MEANS_DIM

#error "This template requires AV1_K_MEANS_DIM to be defined"

#endif

#define RENAME_(x, y) AV1_K_MEANS_RENAME(x, y)

#define RENAME(x) RENAME_(x, AV1_K_MEANS_DIM)

static int RENAME(calc_dist)(const int *p1, const int *p2) {

  int dist = 0;

  for (int i = 0; i < AV1_K_MEANS_DIM; ++i) {

    const int diff = p1[i] - p2[i];

    dist += diff * diff;

  }

  return dist;

}

Unexecuted instantiation: palette.c:calc_dist_dim1_c

Unexecuted instantiation: palette.c:calc_dist_dim2_c

void RENAME(av1_calc_indices)(const int *data, const int *centroids,

                              uint8_t *indices, int n, int k) {

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

    int min_dist = RENAME(calc_dist)(data + i * AV1_K_MEANS_DIM, centroids);

    indices[i] = 0;

    for (int j = 1; j < k; ++j) {

      const int this_dist = RENAME(calc_dist)(data + i * AV1_K_MEANS_DIM,

                                              centroids + j * AV1_K_MEANS_DIM);

      if (this_dist < min_dist) {

        min_dist = this_dist;

        indices[i] = j;

      }

    }

  }

}

Unexecuted instantiation: av1_calc_indices_dim1_c

Unexecuted instantiation: av1_calc_indices_dim2_c

static void RENAME(calc_centroids)(const int *data, int *centroids,

                                   const uint8_t *indices, int n, int k) {

  int i, j;

  int count[PALETTE_MAX_SIZE] = { 0 };

  unsigned int rand_state = (unsigned int)data[0];

  assert(n <= 32768);

  memset(centroids, 0, sizeof(centroids[0]) * k * AV1_K_MEANS_DIM);

  for (i = 0; i < n; ++i) {

    const int index = indices[i];

    assert(index < k);

    ++count[index];

    for (j = 0; j < AV1_K_MEANS_DIM; ++j) {

      centroids[index * AV1_K_MEANS_DIM + j] += data[i * AV1_K_MEANS_DIM + j];

    }

  }

  for (i = 0; i < k; ++i) {

    if (count[i] == 0) {

      memcpy(centroids + i * AV1_K_MEANS_DIM,

             data + (lcg_rand16(&rand_state) % n) * AV1_K_MEANS_DIM,

             sizeof(centroids[0]) * AV1_K_MEANS_DIM);

    } else {

      for (j = 0; j < AV1_K_MEANS_DIM; ++j) {

        centroids[i * AV1_K_MEANS_DIM + j] =

            DIVIDE_AND_ROUND(centroids[i * AV1_K_MEANS_DIM + j], count[i]);

      }

    }

  }

}

Unexecuted instantiation: palette.c:calc_centroids_dim1_c

Unexecuted instantiation: palette.c:calc_centroids_dim2_c

static int64_t RENAME(calc_total_dist)(const int *data, const int *centroids,

                                       const uint8_t *indices, int n, int k) {

  int64_t dist = 0;

  (void)k;

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

    dist += RENAME(calc_dist)(data + i * AV1_K_MEANS_DIM,

                              centroids + indices[i] * AV1_K_MEANS_DIM);

  }

  return dist;

}

Unexecuted instantiation: palette.c:calc_total_dist_dim1_c

Unexecuted instantiation: palette.c:calc_total_dist_dim2_c

void RENAME(av1_k_means)(const int *data, int *centroids, uint8_t *indices,

                         int n, int k, int max_itr) {

  int pre_centroids[2 * PALETTE_MAX_SIZE];

  uint8_t pre_indices[MAX_PALETTE_BLOCK_WIDTH * MAX_PALETTE_BLOCK_HEIGHT];

  assert(n <= MAX_PALETTE_BLOCK_WIDTH * MAX_PALETTE_BLOCK_HEIGHT);

#if AV1_K_MEANS_DIM - 2

  av1_calc_indices_dim1(data, centroids, indices, n, k);

#else

  av1_calc_indices_dim2(data, centroids, indices, n, k);

#endif

  int64_t this_dist = RENAME(calc_total_dist)(data, centroids, indices, n, k);

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

    const int64_t pre_dist = this_dist;

    memcpy(pre_centroids, centroids,

           sizeof(pre_centroids[0]) * k * AV1_K_MEANS_DIM);

    memcpy(pre_indices, indices, sizeof(pre_indices[0]) * n);

    RENAME(calc_centroids)(data, centroids, indices, n, k);

#if AV1_K_MEANS_DIM - 2

    av1_calc_indices_dim1(data, centroids, indices, n, k);

#else

    av1_calc_indices_dim2(data, centroids, indices, n, k);

#endif

    this_dist = RENAME(calc_total_dist)(data, centroids, indices, n, k);

    if (this_dist > pre_dist) {

      memcpy(centroids, pre_centroids,

             sizeof(pre_centroids[0]) * k * AV1_K_MEANS_DIM);

      memcpy(indices, pre_indices, sizeof(pre_indices[0]) * n);

      break;

    }

    if (!memcmp(centroids, pre_centroids,

                sizeof(pre_centroids[0]) * k * AV1_K_MEANS_DIM))

      break;

  }

}

Unexecuted instantiation: av1_k_means_dim1_c

Unexecuted instantiation: av1_k_means_dim2_c

#undef RENAME_

#undef RENAME