third_party/WebKit/Source/platform/geometry/GeometryTestHelpers.cpp

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6 #include "platform/geometry/GeometryTestHelpers.h"
   7
   8 #include <limits>
   9 #include <math.h>
  10
  11 namespace blink {
  12 namespace GeometryTest {
  13
  14 bool ApproximatelyEqual(float a, float b, float testEpsilon)
  15 {
  16     float absA = ::fabs(a);
  17     float absB = ::fabs(b);
  18     float absErr = ::fabs(a - b);
  19     if (a == b)
  20         return true;
  21
  22     if (a == 0 || b == 0 || absErr < std::numeric_limits<float>::min())
  23         return absErr < (testEpsilon * std::numeric_limits<float>::min());
  24
  25     return ((absErr / (absA + absB)) < testEpsilon);
  26 }
  27
  28 ::testing::AssertionResult AssertAlmostEqual(const char* actual_expr, const char* expected_expr, float actual, float expected, float testEpsilon)
  29 {
  30     if (!ApproximatelyEqual(actual, expected, testEpsilon)) {
  31         return ::testing::AssertionFailure() << "       Value of:" << actual_expr << std::endl
  32             << "         Actual:" << ::testing::PrintToString(actual) << std::endl
  33             << "Expected Approx:" << expected_expr << std::endl
  34             << "       Which is:" << ::testing::PrintToString(expected);
  35     }
  36
  37     return ::testing::AssertionSuccess();
  38 }
  39
  40 } // namespace GeometryTest
  41 } // namespace blink