libvpx: Pull from upstream

source/libvpx/test/idct8x8_test.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 49 matching lines @@
       temp_in[j] = output[j + i*8];
     reference_dct_1d(temp_in, temp_out);
     for (int j = 0; j < 8; ++j)
       output[j + i*8] = temp_out[j];
   }
   // Scale by some magic number
   for (int i = 0; i < 64; ++i)
     output[i] *= 2;
 }
 
-void reference_idct_1d(double input[8], double output[8]) {
-  const double kPi = 3.141592653589793238462643383279502884;
-  const double kSqrt2 = 1.414213562373095048801688724209698;
-  for (int k = 0; k < 8; k++) {
-    output[k] = 0.0;
-    for (int n = 0; n < 8; n++) {
-      output[k] += input[n]*cos(kPi*(2*k+1)*n/16.0);
-      if (n == 0)
-        output[k] = output[k]/kSqrt2;
-    }
-  }
-}
-
-void reference_idct_2d(double input[64], int16_t output[64]) {
-  double out[64], out2[64];
-  // First transform rows
-  for (int i = 0; i < 8; ++i) {
-    double temp_in[8], temp_out[8];
-    for (int j = 0; j < 8; ++j)
-      temp_in[j] = input[j + i*8];
-    reference_idct_1d(temp_in, temp_out);
-    for (int j = 0; j < 8; ++j)
-      out[j + i*8] = temp_out[j];
-  }
-  // Then transform columns
-  for (int i = 0; i < 8; ++i) {
-    double temp_in[8], temp_out[8];
-    for (int j = 0; j < 8; ++j)
-      temp_in[j] = out[j*8 + i];
-    reference_idct_1d(temp_in, temp_out);
-    for (int j = 0; j < 8; ++j)
-      out2[j*8 + i] = temp_out[j];
-  }
-  for (int i = 0; i < 64; ++i)
-    output[i] = round(out2[i]/32);
-}
-
 TEST(VP9Idct8x8Test, AccuracyCheck) {
   ACMRandom rnd(ACMRandom::DeterministicSeed());
   const int count_test_block = 10000;
   for (int i = 0; i < count_test_block; ++i) {
     int16_t input[64];
     tran_low_t coeff[64];
     double output_r[64];
     uint8_t dst[64], src[64];
 
     for (int j = 0; j < 64; ++j) {
@@ skipping 12 matching lines @@
       const int diff = dst[j] - src[j];
       const int error = diff * diff;
       EXPECT_GE(1, error)
           << "Error: 8x8 FDCT/IDCT has error " << error
           << " at index " << j;
     }
   }
 }
 
 }  // namespace