/*
 * 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 "test/warp_filter_test_util.h"

using std::tr1::tuple;
using std::tr1::make_tuple;
using std::vector;
using libaom_test::ACMRandom;
using libaom_test::AV1WarpFilter::AV1WarpFilterTest;
using libaom_test::AV1WarpFilter::WarpTestParam;
#if CONFIG_HIGHBITDEPTH
using libaom_test::AV1HighbdWarpFilter::AV1HighbdWarpFilterTest;
using libaom_test::AV1HighbdWarpFilter::HighbdWarpTestParam;
#endif

::testing::internal::ParamGenerator<WarpTestParam>
libaom_test::AV1WarpFilter::BuildParams(warp_affine_func filter) {
  const WarpTestParam params[] = {
    make_tuple(4, 4, 50000, filter),  make_tuple(8, 8, 50000, filter),
    make_tuple(64, 64, 1000, filter), make_tuple(4, 16, 20000, filter),
    make_tuple(32, 8, 10000, filter),
  };
  return ::testing::ValuesIn(params);
}

AV1WarpFilterTest::~AV1WarpFilterTest() {}
void AV1WarpFilterTest::SetUp() { rnd_.Reset(ACMRandom::DeterministicSeed()); }

void AV1WarpFilterTest::TearDown() { libaom_test::ClearSystemState(); }

int32_t AV1WarpFilterTest::random_param(int bits) {
  // 1 in 8 chance of generating zero (arbitrarily chosen)
  if (((rnd_.Rand8()) & 7) == 0) return 0;
  // Otherwise, enerate uniform values in the range
  // [-(1 << bits), 1] U [1, 1<<bits]
  int32_t v = 1 + (rnd_.Rand16() & ((1 << bits) - 1));
  if ((rnd_.Rand8()) & 1) return -v;
  return v;
}

void AV1WarpFilterTest::generate_model(int32_t *mat, int16_t *alpha,
                                       int16_t *beta, int16_t *gamma,
                                       int16_t *delta) {
  while (1) {
    mat[0] = random_param(WARPEDMODEL_PREC_BITS + 6);
    mat[1] = random_param(WARPEDMODEL_PREC_BITS + 6);
    mat[2] = (random_param(WARPEDMODEL_PREC_BITS - 3)) +
             (1 << WARPEDMODEL_PREC_BITS);
    mat[3] = random_param(WARPEDMODEL_PREC_BITS - 3);
    // 50/50 chance of generating ROTZOOM vs. AFFINE models
    if (rnd_.Rand8() & 1) {
      // AFFINE
      mat[4] = random_param(WARPEDMODEL_PREC_BITS - 3);
      mat[5] = (random_param(WARPEDMODEL_PREC_BITS - 3)) +
               (1 << WARPEDMODEL_PREC_BITS);
    } else {
      mat[4] = -mat[3];
      mat[5] = mat[2];
    }

    // Calculate the derived parameters and check that they are suitable
    // for the warp filter.
    assert(mat[2] != 0);

    *alpha = clamp(mat[2] - (1 << WARPEDMODEL_PREC_BITS), INT16_MIN, INT16_MAX);
    *beta = clamp(mat[3], INT16_MIN, INT16_MAX);
    *gamma = clamp(((int64_t)mat[4] * (1 << WARPEDMODEL_PREC_BITS)) / mat[2],
                   INT16_MIN, INT16_MAX);
    *delta =
        clamp(mat[5] - (((int64_t)mat[3] * mat[4] + (mat[2] / 2)) / mat[2]) -
                  (1 << WARPEDMODEL_PREC_BITS),
              INT16_MIN, INT16_MAX);

    if ((4 * abs(*alpha) + 7 * abs(*beta) >= (1 << WARPEDMODEL_PREC_BITS)) ||
        (4 * abs(*gamma) + 4 * abs(*delta) >= (1 << WARPEDMODEL_PREC_BITS)))
      continue;

    // We have a valid model, so finish
    return;
  }
}

void AV1WarpFilterTest::RunCheckOutput(warp_affine_func test_impl) {
  const int w = 128, h = 128;
  const int border = 16;
  const int stride = w + 2 * border;
  const int out_w = GET_PARAM(0), out_h = GET_PARAM(1);
  const int num_iters = GET_PARAM(2);
  int i, j, sub_x, sub_y;

  uint8_t *input_ = new uint8_t[h * stride];
  uint8_t *input = input_ + border;

  // The warp functions always write rows with widths that are multiples of 8.
  // So to avoid a buffer overflow, we may need to pad rows to a multiple of 8.
  int output_n = ((out_w + 7) & ~7) * out_h;
  uint8_t *output = new uint8_t[output_n];
  uint8_t *output2 = new uint8_t[output_n];
  int32_t mat[8];
  int16_t alpha, beta, gamma, delta;

  // Generate an input block and extend its borders horizontally
  for (i = 0; i < h; ++i)
    for (j = 0; j < w; ++j) input[i * stride + j] = rnd_.Rand8();
  for (i = 0; i < h; ++i) {
    memset(input + i * stride - border, input[i * stride], border);
    memset(input + i * stride + w, input[i * stride + (w - 1)], border);
  }

  for (i = 0; i < num_iters; ++i) {
    for (sub_x = 0; sub_x < 2; ++sub_x)
      for (sub_y = 0; sub_y < 2; ++sub_y) {
        generate_model(mat, &alpha, &beta, &gamma, &delta);
        av1_warp_affine_c(mat, input, w, h, stride, output, 32, 32, out_w,
                          out_h, out_w, sub_x, sub_y, 0, alpha, beta, gamma,
                          delta);
        test_impl(mat, input, w, h, stride, output2, 32, 32, out_w, out_h,
                  out_w, sub_x, sub_y, 0, alpha, beta, gamma, delta);

        for (j = 0; j < out_w * out_h; ++j)
          ASSERT_EQ(output[j], output2[j])
              << "Pixel mismatch at index " << j << " = (" << (j % out_w)
              << ", " << (j / out_w) << ") on iteration " << i;
      }
  }
  delete[] input_;
  delete[] output;
  delete[] output2;
}

#if CONFIG_HIGHBITDEPTH
::testing::internal::ParamGenerator<HighbdWarpTestParam>
libaom_test::AV1HighbdWarpFilter::GetDefaultParams() {
  const HighbdWarpTestParam defaultParams[] = {
    make_tuple(4, 4, 50000, 8),   make_tuple(8, 8, 50000, 8),
    make_tuple(64, 64, 1000, 8),  make_tuple(4, 16, 20000, 8),
    make_tuple(32, 8, 10000, 8),  make_tuple(4, 4, 50000, 10),
    make_tuple(8, 8, 50000, 10),  make_tuple(64, 64, 1000, 10),
    make_tuple(4, 16, 20000, 10), make_tuple(32, 8, 10000, 10),
    make_tuple(4, 4, 50000, 12),  make_tuple(8, 8, 50000, 12),
    make_tuple(64, 64, 1000, 12), make_tuple(4, 16, 20000, 12),
    make_tuple(32, 8, 10000, 12),
  };
  return ::testing::ValuesIn(defaultParams);
}

AV1HighbdWarpFilterTest::~AV1HighbdWarpFilterTest() {}
void AV1HighbdWarpFilterTest::SetUp() {
  rnd_.Reset(ACMRandom::DeterministicSeed());
}

void AV1HighbdWarpFilterTest::TearDown() { libaom_test::ClearSystemState(); }

int32_t AV1HighbdWarpFilterTest::random_param(int bits) {
  // 1 in 8 chance of generating zero (arbitrarily chosen)
  if (((rnd_.Rand8()) & 7) == 0) return 0;
  // Otherwise, enerate uniform values in the range
  // [-(1 << bits), 1] U [1, 1<<bits]
  int32_t v = 1 + (rnd_.Rand16() & ((1 << bits) - 1));
  if ((rnd_.Rand8()) & 1) return -v;
  return v;
}

void AV1HighbdWarpFilterTest::generate_model(int32_t *mat, int16_t *alpha,
                                             int16_t *beta, int16_t *gamma,
                                             int16_t *delta) {
  while (1) {
    mat[0] = random_param(WARPEDMODEL_PREC_BITS + 6);
    mat[1] = random_param(WARPEDMODEL_PREC_BITS + 6);
    mat[2] = (random_param(WARPEDMODEL_PREC_BITS - 3)) +
             (1 << WARPEDMODEL_PREC_BITS);
    mat[3] = random_param(WARPEDMODEL_PREC_BITS - 3);
    // 50/50 chance of generating ROTZOOM vs. AFFINE models
    if (rnd_.Rand8() & 1) {
      // AFFINE
      mat[4] = random_param(WARPEDMODEL_PREC_BITS - 3);
      mat[5] = (random_param(WARPEDMODEL_PREC_BITS - 3)) +
               (1 << WARPEDMODEL_PREC_BITS);
    } else {
      mat[4] = -mat[3];
      mat[5] = mat[2];
    }

    // Calculate the derived parameters and check that they are suitable
    // for the warp filter.
    assert(mat[2] != 0);

    *alpha = clamp(mat[2] - (1 << WARPEDMODEL_PREC_BITS), INT16_MIN, INT16_MAX);
    *beta = clamp(mat[3], INT16_MIN, INT16_MAX);
    *gamma = clamp(((int64_t)mat[4] * (1 << WARPEDMODEL_PREC_BITS)) / mat[2],
                   INT16_MIN, INT16_MAX);
    *delta =
        clamp(mat[5] - (((int64_t)mat[3] * mat[4] + (mat[2] / 2)) / mat[2]) -
                  (1 << WARPEDMODEL_PREC_BITS),
              INT16_MIN, INT16_MAX);

    if ((4 * abs(*alpha) + 7 * abs(*beta) >= (1 << WARPEDMODEL_PREC_BITS)) ||
        (4 * abs(*gamma) + 4 * abs(*delta) >= (1 << WARPEDMODEL_PREC_BITS)))
      continue;

    // We have a valid model, so finish
    return;
  }
}

void AV1HighbdWarpFilterTest::RunCheckOutput(
    highbd_warp_affine_func test_impl) {
  const int w = 128, h = 128;
  const int border = 16;
  const int stride = w + 2 * border;
  const int out_w = GET_PARAM(0), out_h = GET_PARAM(1);
  const int num_iters = GET_PARAM(2);
  const int bd = GET_PARAM(3);
  const int mask = (1 << bd) - 1;
  int i, j, sub_x, sub_y;

  // The warp functions always write rows with widths that are multiples of 8.
  // So to avoid a buffer overflow, we may need to pad rows to a multiple of 8.
  int output_n = ((out_w + 7) & ~7) * out_h;
  uint16_t *input_ = new uint16_t[h * stride];
  uint16_t *input = input_ + border;
  uint16_t *output = new uint16_t[output_n];
  uint16_t *output2 = new uint16_t[output_n];
  int32_t mat[8];
  int16_t alpha, beta, gamma, delta;

  // Generate an input block and extend its borders horizontally
  for (i = 0; i < h; ++i)
    for (j = 0; j < w; ++j) input[i * stride + j] = rnd_.Rand16() & mask;
  for (i = 0; i < h; ++i) {
    for (j = 0; j < border; ++j) {
      input[i * stride - border + j] = input[i * stride];
      input[i * stride + w + j] = input[i * stride + (w - 1)];
    }
  }

  for (i = 0; i < num_iters; ++i) {
    for (sub_x = 0; sub_x < 2; ++sub_x)
      for (sub_y = 0; sub_y < 2; ++sub_y) {
        generate_model(mat, &alpha, &beta, &gamma, &delta);

        av1_highbd_warp_affine_c(mat, input, w, h, stride, output, 32, 32,
                                 out_w, out_h, out_w, sub_x, sub_y, bd, 0,
                                 alpha, beta, gamma, delta);
        test_impl(mat, input, w, h, stride, output2, 32, 32, out_w, out_h,
                  out_w, sub_x, sub_y, bd, 0, alpha, beta, gamma, delta);

        for (j = 0; j < out_w * out_h; ++j)
          ASSERT_EQ(output[j], output2[j])
              << "Pixel mismatch at index " << j << " = (" << (j % out_w)
              << ", " << (j / out_w) << ") on iteration " << i;
      }
  }

  delete[] input_;
  delete[] output;
  delete[] output2;
}
#endif  // CONFIG_HIGHBITDEPTH