text: /*
   *  Copyright (c) 2014 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 <math.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "third_party/googletest/src/include/gtest/gtest.h"
  #include "test/acm_random.h"
  #include "test/clear_system_state.h"
  #include "test/register_state_check.h"
  #include "test/util.h"
  
  #include "vp8/encoder/denoising.h"
  #include "vp8/common/reconinter.h"
  #include "vpx/vpx_integer.h"
  #include "vpx_mem/vpx_mem.h"
  
  using libvpx_test::ACMRandom;
  
  namespace {
  
  const int kNumPixels = 16 * 16;
  class VP8DenoiserTest : public ::testing::TestWithParam<int> {
   public:
    virtual ~VP8DenoiserTest() {}
  
    virtual void SetUp() {
      increase_denoising_ = GetParam();
    }
  
    virtual void TearDown() { libvpx_test::ClearSystemState(); }
  
   protected:
    int increase_denoising_;
  };
  
  TEST_P(VP8DenoiserTest, BitexactCheck) {
    ACMRandom rnd(ACMRandom::DeterministicSeed());
    const int count_test_block = 4000;
    const int stride = 16;
  
    // Allocate the space for input and output,
    // where sig_block_c/_sse2 is the block to be denoised,
    // mc_avg_block is the denoised reference block,
    // avg_block_c is the denoised result from C code,
    // avg_block_sse2 is the denoised result from SSE2 code.
    DECLARE_ALIGNED_ARRAY(16, uint8_t, sig_block_c, kNumPixels);
    // Since in VP8 denoiser, the source signal will be changed,
    // we need another copy of the source signal as the input of sse2 code.
    DECLARE_ALIGNED_ARRAY(16, uint8_t, sig_block_sse2, kNumPixels);
    DECLARE_ALIGNED_ARRAY(16, uint8_t, mc_avg_block, kNumPixels);
    DECLARE_ALIGNED_ARRAY(16, uint8_t, avg_block_c, kNumPixels);
    DECLARE_ALIGNED_ARRAY(16, uint8_t, avg_block_sse2, kNumPixels);
  
    for (int i = 0; i < count_test_block; ++i) {
      // Generate random motion magnitude, 20% of which exceed the threshold.
      const int motion_magnitude_ran =
          rnd.Rand8() % static_cast<int>(MOTION_MAGNITUDE_THRESHOLD * 1.2);
  
      // Initialize a test block with random number in range [0, 255].
      for (int j = 0; j < kNumPixels; ++j) {
        int temp = 0;
        sig_block_sse2[j] = sig_block_c[j] = rnd.Rand8();
        // The pixels in mc_avg_block are generated by adding a random
        // number in range [-19, 19] to corresponding pixels in sig_block.
        temp = sig_block_c[j] + (rnd.Rand8() % 2 == 0 ? -1 : 1) *
               (rnd.Rand8() % 20);
        // Clip.
        mc_avg_block[j] = (temp < 0) ? 0 : ((temp > 255) ? 255 : temp);
      }
  
      // Test denosiser on Y component.
      ASM_REGISTER_STATE_CHECK(vp8_denoiser_filter_c(
          mc_avg_block, stride, avg_block_c, stride, sig_block_c, stride,
          motion_magnitude_ran, increase_denoising_));
  
      ASM_REGISTER_STATE_CHECK(vp8_denoiser_filter_sse2(
          mc_avg_block, stride, avg_block_sse2, stride, sig_block_sse2, stride,
          motion_magnitude_ran, increase_denoising_));
  
      // Check bitexactness.
      for (int h = 0; h < 16; ++h) {
        for (int w = 0; w < 16; ++w) {
          EXPECT_EQ(avg_block_c[h * stride + w], avg_block_sse2[h * stride + w]);
        }
      }
  
      // Test denoiser on UV component.
      ASM_REGISTER_STATE_CHECK(vp8_denoiser_filter_uv_c(
          mc_avg_block, stride, avg_block_c, stride, sig_block_c, stride,
          motion_magnitude_ran, increase_denoising_));
  
      ASM_REGISTER_STATE_CHECK(vp8_denoiser_filter_uv_sse2(
          mc_avg_block, stride, avg_block_sse2, stride, sig_block_sse2, stride,
          motion_magnitude_ran, increase_denoising_));
  
      // Check bitexactness.
      for (int h = 0; h < 16; ++h) {
        for (int w = 0; w < 16; ++w) {
          EXPECT_EQ(avg_block_c[h * stride + w], avg_block_sse2[h * stride + w]);
        }
      }
    }
  }
  
  // Test for all block size.
  INSTANTIATE_TEST_CASE_P(SSE2, VP8DenoiserTest, ::testing::Values(0, 1));
  }  // namespace
  