/*
 *  Copyright (c) 2015 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.
 */

#include <stdlib.h>

#include "./vpx_config.h"
#include "./vpx_dsp_rtcd.h"

#include "vpx/vpx_integer.h"
#include "vpx_ports/mem.h"

/* Sum the difference between every corresponding element of the buffers. */
static INLINE unsigned int sad(const uint8_t *a, int a_stride,
                               const uint8_t *b, int b_stride,
                               int width, int height) {
  int y, x;
  unsigned int sad = 0;

  for (y = 0; y < height; y++) {
    for (x = 0; x < width; x++)
      sad += abs(a[x] - b[x]);

    a += a_stride;
    b += b_stride;
  }
  return sad;
}

// TODO(johannkoenig): this moved to vpx_dsp, should be able to clean this up.
/* Remove dependency on vp9 variance function by duplicating vp9_comp_avg_pred.
 * The function averages every corresponding element of the buffers and stores
 * the value in a third buffer, comp_pred.
 * pred and comp_pred are assumed to have stride = width
 * In the usage below comp_pred is a local array.
 */
static INLINE void avg_pred(uint8_t *comp_pred, const uint8_t *pred, int width,
                            int height, const uint8_t *ref, int ref_stride) {
  int i, j;

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      const int tmp = pred[j] + ref[j];
      comp_pred[j] = ROUND_POWER_OF_TWO(tmp, 1);
    }
    comp_pred += width;
    pred += width;
    ref += ref_stride;
  }
}

#if CONFIG_VP9_HIGHBITDEPTH
static INLINE void highbd_avg_pred(uint16_t *comp_pred, const uint8_t *pred8,
                                   int width, int height, const uint8_t *ref8,
                                   int ref_stride) {
  int i, j;
  uint16_t *pred = CONVERT_TO_SHORTPTR(pred8);
  uint16_t *ref = CONVERT_TO_SHORTPTR(ref8);
  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      const int tmp = pred[j] + ref[j];
      comp_pred[j] = ROUND_POWER_OF_TWO(tmp, 1);
    }
    comp_pred += width;
    pred += width;
    ref += ref_stride;
  }
}
#endif  // CONFIG_VP9_HIGHBITDEPTH

#define sadMxN(m, n) \
unsigned int vpx_sad##m##x##n##_c(const uint8_t *src, int src_stride, \
                                  const uint8_t *ref, int ref_stride) { \
  return sad(src, src_stride, ref, ref_stride, m, n); \
} \
unsigned int vpx_sad##m##x##n##_avg_c(const uint8_t *src, int src_stride, \
                                      const uint8_t *ref, int ref_stride, \
                                      const uint8_t *second_pred) { \
  uint8_t comp_pred[m * n]; \
  avg_pred(comp_pred, second_pred, m, n, ref, ref_stride); \
  return sad(src, src_stride, comp_pred, m, m, n); \
}

// depending on call sites, pass **ref_array to avoid & in subsequent call and
// de-dup with 4D below.
#define sadMxNxK(m, n, k) \
void vpx_sad##m##x##n##x##k##_c(const uint8_t *src, int src_stride, \
                                const uint8_t *ref_array, int ref_stride, \
                                uint32_t *sad_array) { \
  int i; \
  for (i = 0; i < k; ++i) \
    sad_array[i] = vpx_sad##m##x##n##_c(src, src_stride, &ref_array[i], ref_stride); \
}

// This appears to be equivalent to the above when k == 4 and refs is const
#define sadMxNx4D(m, n) \
void vpx_sad##m##x##n##x4d_c(const uint8_t *src, int src_stride, \
                             const uint8_t *const ref_array[], int ref_stride, \
                             uint32_t *sad_array) { \
  int i; \
  for (i = 0; i < 4; ++i) \
    sad_array[i] = vpx_sad##m##x##n##_c(src, src_stride, ref_array[i], ref_stride); \
}

// 64x64
sadMxN(64, 64)
sadMxNxK(64, 64, 3)
sadMxNxK(64, 64, 8)
sadMxNx4D(64, 64)

// 64x32
sadMxN(64, 32)
sadMxNx4D(64, 32)

// 32x64
sadMxN(32, 64)
sadMxNx4D(32, 64)

// 32x32
sadMxN(32, 32)
sadMxNxK(32, 32, 3)
sadMxNxK(32, 32, 8)
sadMxNx4D(32, 32)

// 32x16
sadMxN(32, 16)
sadMxNx4D(32, 16)

// 16x32
sadMxN(16, 32)
sadMxNx4D(16, 32)

// 16x16
sadMxN(16, 16)
sadMxNxK(16, 16, 3)
sadMxNxK(16, 16, 8)
sadMxNx4D(16, 16)

// 16x8
sadMxN(16, 8)
sadMxNxK(16, 8, 3)
sadMxNxK(16, 8, 8)
sadMxNx4D(16, 8)

// 8x16
sadMxN(8, 16)
sadMxNxK(8, 16, 3)
sadMxNxK(8, 16, 8)
sadMxNx4D(8, 16)

// 8x8
sadMxN(8, 8)
sadMxNxK(8, 8, 3)
sadMxNxK(8, 8, 8)
sadMxNx4D(8, 8)

// 8x4
sadMxN(8, 4)
sadMxNxK(8, 4, 8)
sadMxNx4D(8, 4)

// 4x8
sadMxN(4, 8)
sadMxNxK(4, 8, 8)
sadMxNx4D(4, 8)

// 4x4
sadMxN(4, 4)
sadMxNxK(4, 4, 3)
sadMxNxK(4, 4, 8)
sadMxNx4D(4, 4)

#if CONFIG_VP9_HIGHBITDEPTH
static INLINE unsigned int highbd_sad(const uint8_t *a8, int a_stride,
                                      const uint8_t *b8, int b_stride,
                                      int width, int height) {
  int y, x;
  unsigned int sad = 0;
  const uint16_t *a = CONVERT_TO_SHORTPTR(a8);
  const uint16_t *b = CONVERT_TO_SHORTPTR(b8);
  for (y = 0; y < height; y++) {
    for (x = 0; x < width; x++)
      sad += abs(a[x] - b[x]);

    a += a_stride;
    b += b_stride;
  }
  return sad;
}

static INLINE unsigned int highbd_sadb(const uint8_t *a8, int a_stride,
                                       const uint16_t *b, int b_stride,
                                       int width, int height) {
  int y, x;
  unsigned int sad = 0;
  const uint16_t *a = CONVERT_TO_SHORTPTR(a8);
  for (y = 0; y < height; y++) {
    for (x = 0; x < width; x++)
      sad += abs(a[x] - b[x]);

    a += a_stride;
    b += b_stride;
  }
  return sad;
}

#define highbd_sadMxN(m, n) \
unsigned int vpx_highbd_sad##m##x##n##_c(const uint8_t *src, int src_stride, \
                                         const uint8_t *ref, int ref_stride) { \
  return highbd_sad(src, src_stride, ref, ref_stride, m, n); \
} \
unsigned int vpx_highbd_sad##m##x##n##_avg_c(const uint8_t *src, \
                                             int src_stride, \
                                             const uint8_t *ref, \
                                             int ref_stride, \
                                             const uint8_t *second_pred) { \
  uint16_t comp_pred[m * n]; \
  highbd_avg_pred(comp_pred, second_pred, m, n, ref, ref_stride); \
  return highbd_sadb(src, src_stride, comp_pred, m, m, n); \
}

#define highbd_sadMxNxK(m, n, k) \
void vpx_highbd_sad##m##x##n##x##k##_c(const uint8_t *src, int src_stride, \
                                       const uint8_t *ref_array, int ref_stride, \
                                       uint32_t *sad_array) { \
  int i; \
  for (i = 0; i < k; ++i) { \
    sad_array[i] = vpx_highbd_sad##m##x##n##_c(src, src_stride, &ref_array[i], \
                                               ref_stride); \
  } \
}

#define highbd_sadMxNx4D(m, n) \
void vpx_highbd_sad##m##x##n##x4d_c(const uint8_t *src, int src_stride, \
                                    const uint8_t *const ref_array[], \
                                    int ref_stride, uint32_t *sad_array) { \
  int i; \
  for (i = 0; i < 4; ++i) { \
    sad_array[i] = vpx_highbd_sad##m##x##n##_c(src, src_stride, ref_array[i], \
                                               ref_stride); \
  } \
}

// 64x64
highbd_sadMxN(64, 64)
highbd_sadMxNxK(64, 64, 3)
highbd_sadMxNxK(64, 64, 8)
highbd_sadMxNx4D(64, 64)

// 64x32
highbd_sadMxN(64, 32)
highbd_sadMxNx4D(64, 32)

// 32x64
highbd_sadMxN(32, 64)
highbd_sadMxNx4D(32, 64)

// 32x32
highbd_sadMxN(32, 32)
highbd_sadMxNxK(32, 32, 3)
highbd_sadMxNxK(32, 32, 8)
highbd_sadMxNx4D(32, 32)

// 32x16
highbd_sadMxN(32, 16)
highbd_sadMxNx4D(32, 16)

// 16x32
highbd_sadMxN(16, 32)
highbd_sadMxNx4D(16, 32)

// 16x16
highbd_sadMxN(16, 16)
highbd_sadMxNxK(16, 16, 3)
highbd_sadMxNxK(16, 16, 8)
highbd_sadMxNx4D(16, 16)

// 16x8
highbd_sadMxN(16, 8)
highbd_sadMxNxK(16, 8, 3)
highbd_sadMxNxK(16, 8, 8)
highbd_sadMxNx4D(16, 8)

// 8x16
highbd_sadMxN(8, 16)
highbd_sadMxNxK(8, 16, 3)
highbd_sadMxNxK(8, 16, 8)
highbd_sadMxNx4D(8, 16)

// 8x8
highbd_sadMxN(8, 8)
highbd_sadMxNxK(8, 8, 3)
highbd_sadMxNxK(8, 8, 8)
highbd_sadMxNx4D(8, 8)

// 8x4
highbd_sadMxN(8, 4)
highbd_sadMxNxK(8, 4, 8)
highbd_sadMxNx4D(8, 4)

// 4x8
highbd_sadMxN(4, 8)
highbd_sadMxNxK(4, 8, 8)
highbd_sadMxNx4D(4, 8)

// 4x4
highbd_sadMxN(4, 4)
highbd_sadMxNxK(4, 4, 3)
highbd_sadMxNxK(4, 4, 8)
highbd_sadMxNx4D(4, 4)

#endif  // CONFIG_VP9_HIGHBITDEPTH