1 // Copyright 2011 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 "cc/animation/timing_function.h" 6 7 #include "testing/gtest/include/gtest/gtest.h" 8 9 namespace cc { 10 namespace { 11 12 TEST(TimingFunctionTest, CubicBezierTimingFunction) { 13 scoped_ptr<CubicBezierTimingFunction> function = 14 CubicBezierTimingFunction::Create(0.25, 0.0, 0.75, 1.0); 15 16 double epsilon = 0.00015; 17 18 EXPECT_NEAR(function->GetValue(0), 0, epsilon); 19 EXPECT_NEAR(function->GetValue(0.05), 0.01136, epsilon); 20 EXPECT_NEAR(function->GetValue(0.1), 0.03978, epsilon); 21 EXPECT_NEAR(function->GetValue(0.15), 0.079780, epsilon); 22 EXPECT_NEAR(function->GetValue(0.2), 0.12803, epsilon); 23 EXPECT_NEAR(function->GetValue(0.25), 0.18235, epsilon); 24 EXPECT_NEAR(function->GetValue(0.3), 0.24115, epsilon); 25 EXPECT_NEAR(function->GetValue(0.35), 0.30323, epsilon); 26 EXPECT_NEAR(function->GetValue(0.4), 0.36761, epsilon); 27 EXPECT_NEAR(function->GetValue(0.45), 0.43345, epsilon); 28 EXPECT_NEAR(function->GetValue(0.5), 0.5, epsilon); 29 EXPECT_NEAR(function->GetValue(0.6), 0.63238, epsilon); 30 EXPECT_NEAR(function->GetValue(0.65), 0.69676, epsilon); 31 EXPECT_NEAR(function->GetValue(0.7), 0.75884, epsilon); 32 EXPECT_NEAR(function->GetValue(0.75), 0.81764, epsilon); 33 EXPECT_NEAR(function->GetValue(0.8), 0.87196, epsilon); 34 EXPECT_NEAR(function->GetValue(0.85), 0.92021, epsilon); 35 EXPECT_NEAR(function->GetValue(0.9), 0.96021, epsilon); 36 EXPECT_NEAR(function->GetValue(0.95), 0.98863, epsilon); 37 EXPECT_NEAR(function->GetValue(1), 1, epsilon); 38 } 39 40 // Tests that the bezier timing function works with knots with y not in (0, 1). 41 TEST(TimingFunctionTest, CubicBezierTimingFunctionUnclampedYValues) { 42 scoped_ptr<CubicBezierTimingFunction> function = 43 CubicBezierTimingFunction::Create(0.5, -1.0, 0.5, 2.0); 44 45 double epsilon = 0.00015; 46 47 EXPECT_NEAR(function->GetValue(0.0), 0.0, epsilon); 48 EXPECT_NEAR(function->GetValue(0.05), -0.08954, epsilon); 49 EXPECT_NEAR(function->GetValue(0.1), -0.15613, epsilon); 50 EXPECT_NEAR(function->GetValue(0.15), -0.19641, epsilon); 51 EXPECT_NEAR(function->GetValue(0.2), -0.20651, epsilon); 52 EXPECT_NEAR(function->GetValue(0.25), -0.18232, epsilon); 53 EXPECT_NEAR(function->GetValue(0.3), -0.11992, epsilon); 54 EXPECT_NEAR(function->GetValue(0.35), -0.01672, epsilon); 55 EXPECT_NEAR(function->GetValue(0.4), 0.12660, epsilon); 56 EXPECT_NEAR(function->GetValue(0.45), 0.30349, epsilon); 57 EXPECT_NEAR(function->GetValue(0.5), 0.50000, epsilon); 58 EXPECT_NEAR(function->GetValue(0.55), 0.69651, epsilon); 59 EXPECT_NEAR(function->GetValue(0.6), 0.87340, epsilon); 60 EXPECT_NEAR(function->GetValue(0.65), 1.01672, epsilon); 61 EXPECT_NEAR(function->GetValue(0.7), 1.11992, epsilon); 62 EXPECT_NEAR(function->GetValue(0.75), 1.18232, epsilon); 63 EXPECT_NEAR(function->GetValue(0.8), 1.20651, epsilon); 64 EXPECT_NEAR(function->GetValue(0.85), 1.19641, epsilon); 65 EXPECT_NEAR(function->GetValue(0.9), 1.15613, epsilon); 66 EXPECT_NEAR(function->GetValue(0.95), 1.08954, epsilon); 67 EXPECT_NEAR(function->GetValue(1.0), 1.0, epsilon); 68 } 69 70 TEST(TimingFunctionTest, CubicBezierTimingFunctionRange) { 71 double epsilon = 0.00015; 72 float min, max; 73 74 // Derivative is a constant. 75 scoped_ptr<CubicBezierTimingFunction> function = 76 CubicBezierTimingFunction::Create(0.25, (1.0 / 3.0), 0.75, (2.0 / 3.0)); 77 function->Range(&min, &max); 78 EXPECT_EQ(0.f, min); 79 EXPECT_EQ(1.f, max); 80 81 // Derivative is linear. 82 function = CubicBezierTimingFunction::Create(0.25, -0.5, 0.75, (-1.0 / 6.0)); 83 function->Range(&min, &max); 84 EXPECT_NEAR(min, -0.225, epsilon); 85 EXPECT_EQ(1.f, max); 86 87 // Derivative has no real roots. 88 function = CubicBezierTimingFunction::Create(0.25, 0.25, 0.75, 0.5); 89 function->Range(&min, &max); 90 EXPECT_EQ(0.f, min); 91 EXPECT_EQ(1.f, max); 92 93 // Derivative has exactly one real root. 94 function = CubicBezierTimingFunction::Create(0.0, 1.0, 1.0, 0.0); 95 function->Range(&min, &max); 96 EXPECT_EQ(0.f, min); 97 EXPECT_EQ(1.f, max); 98 99 // Derivative has one root < 0 and one root > 1. 100 function = CubicBezierTimingFunction::Create(0.25, 0.1, 0.75, 0.9); 101 function->Range(&min, &max); 102 EXPECT_EQ(0.f, min); 103 EXPECT_EQ(1.f, max); 104 105 // Derivative has two roots in [0,1]. 106 function = CubicBezierTimingFunction::Create(0.25, 2.5, 0.75, 0.5); 107 function->Range(&min, &max); 108 EXPECT_EQ(0.f, min); 109 EXPECT_NEAR(max, 1.28818, epsilon); 110 function = CubicBezierTimingFunction::Create(0.25, 0.5, 0.75, -1.5); 111 function->Range(&min, &max); 112 EXPECT_NEAR(min, -0.28818, epsilon); 113 EXPECT_EQ(1.f, max); 114 115 // Derivative has one root < 0 and one root in [0,1]. 116 function = CubicBezierTimingFunction::Create(0.25, 0.1, 0.75, 1.5); 117 function->Range(&min, &max); 118 EXPECT_EQ(0.f, min); 119 EXPECT_NEAR(max, 1.10755, epsilon); 120 121 // Derivative has one root in [0,1] and one root > 1. 122 function = CubicBezierTimingFunction::Create(0.25, -0.5, 0.75, 0.9); 123 function->Range(&min, &max); 124 EXPECT_NEAR(min, -0.10755, epsilon); 125 EXPECT_EQ(1.f, max); 126 127 // Derivative has two roots < 0. 128 function = CubicBezierTimingFunction::Create(0.25, 0.3, 0.75, 0.633); 129 function->Range(&min, &max); 130 EXPECT_EQ(0.f, min); 131 EXPECT_EQ(1.f, max); 132 133 // Derivative has two roots > 1. 134 function = CubicBezierTimingFunction::Create(0.25, 0.367, 0.75, 0.7); 135 function->Range(&min, &max); 136 EXPECT_EQ(0.f, min); 137 EXPECT_EQ(1.f, max); 138 } 139 140 } // namespace 141 } // namespace cc 142
