Web Animations API: Implement step-middle and steps(x, middle) timing functions.

Source/platform/animation/TimingFunctionTest.cpp

Index: Source/platform/animation/TimingFunctionTest.cpp
diff --git a/Source/platform/animation/TimingFunctionTest.cpp b/Source/platform/animation/TimingFunctionTest.cpp
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index 0000000000000000000000000000000000000000..50558fb0505363a67fce859dbab9935148a7e474
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+++ b/Source/platform/animation/TimingFunctionTest.cpp
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+/*
+ * Copyright (c) 2013, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "platform/animation/TimingFunction.h"
+
+#include "wtf/text/WTFString.h"
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <sstream>
+#include <string>
+
+// Macro is only used to allow the use of streams.
+// Can be removed if a pretty failure message isn't needed.
+#define EXPECT_NE_WITH_MESSAGE(a, b) \
+    EXPECT_NE(*a.second, *b.second) \
+        << a.first \
+        << " (" << a.second->toString().latin1().data() << ")" \
+        << " ==  " \
+        << b.first \
+        << " (" << b.second->toString().latin1().data() << ")" \
+        << "\n";
+
+namespace WebCore {
+
+namespace {
+
+using namespace WebCore;
+
+class TimingFunctionTest : public ::testing::Test {
+public:
+    void notEqualHelperLoop(Vector<std::pair<std::string, RefPtr<TimingFunction> > >& v)
+    {
+        for (size_t i = 0; i < v.size(); ++i) {
+            for (size_t j = 0; j < v.size(); ++j) {
+                if (i == j)
+                    continue;
+                EXPECT_NE_WITH_MESSAGE(v[i], v[j]);
+            }
+        }
+    }
+};
+
+TEST_F(TimingFunctionTest, LinearToString)
+{
+    RefPtr<TimingFunction> linearTiming = LinearTimingFunction::create();
+    EXPECT_EQ(linearTiming->toString(), "linear");
+}
+
+TEST_F(TimingFunctionTest, CubicToString)
+{
+    RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
+    EXPECT_EQ("ease", cubicEaseTiming->toString());
+    RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    EXPECT_EQ("ease-in", cubicEaseInTiming->toString());
+    RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
+    EXPECT_EQ("ease-out", cubicEaseOutTiming->toString());
+    RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
+    EXPECT_EQ("ease-in-out", cubicEaseInOutTiming->toString());
+
+    RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
+    EXPECT_EQ("cubic-bezier(0.17, 0.67, 1, -1.73)", cubicCustomTiming->toString());
+}
+
+TEST_F(TimingFunctionTest, StepToString)
+{
+    RefPtr<TimingFunction> stepTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
+    EXPECT_EQ("step-start", stepTimingStart->toString());
+
+    RefPtr<TimingFunction> stepTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
+    EXPECT_EQ("step-middle", stepTimingMiddle->toString());
+
+    RefPtr<TimingFunction> stepTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
+    EXPECT_EQ("step-end", stepTimingEnd->toString());
+
+    RefPtr<TimingFunction> stepTimingCustomStart = StepsTimingFunction::create(3, StepsTimingFunction::StepAtStart);
+    EXPECT_EQ("steps(3, start)", stepTimingCustomStart->toString());
+
+    RefPtr<TimingFunction> stepTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::StepAtMiddle);
+    EXPECT_EQ("steps(4, middle)", stepTimingCustomMiddle->toString());
+
+    RefPtr<TimingFunction> stepTimingCustomEnd = StepsTimingFunction::create(5, StepsTimingFunction::StepAtEnd);
+    EXPECT_EQ("steps(5, end)", stepTimingCustomEnd->toString());
+}
+
+TEST_F(TimingFunctionTest, BaseOperatorEq)
+{
+    RefPtr<TimingFunction> linearTiming = LinearTimingFunction::create();
+    RefPtr<TimingFunction> cubicTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    RefPtr<TimingFunction> cubicTiming2 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
+    RefPtr<TimingFunction> stepsTiming1 = StepsTimingFunction::preset(StepsTimingFunction::End);
+    RefPtr<TimingFunction> stepsTiming2 = StepsTimingFunction::create(5, StepsTimingFunction::StepAtStart);
+
+    Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
+    v.append(std::make_pair("linearTiming", linearTiming));
+    v.append(std::make_pair("cubicTiming1", cubicTiming1));
+    v.append(std::make_pair("cubicTiming2", cubicTiming2));
+    v.append(std::make_pair("stepsTiming1", stepsTiming1));
+    v.append(std::make_pair("stepsTiming2", stepsTiming2));
+    notEqualHelperLoop(v);
+}
+
+TEST_F(TimingFunctionTest, LinearOperatorEq)
+{
+    RefPtr<TimingFunction> linearTiming1 = LinearTimingFunction::create();
+    RefPtr<TimingFunction> linearTiming2 = LinearTimingFunction::create();
+    EXPECT_EQ(*linearTiming1, *linearTiming1);
+    EXPECT_EQ(*linearTiming1, *linearTiming2);
+}
+
+TEST_F(TimingFunctionTest, CubicOperatorEq)
+{
+    RefPtr<TimingFunction> cubicEaseInTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    RefPtr<TimingFunction> cubicEaseInTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    EXPECT_EQ(*cubicEaseInTiming1, *cubicEaseInTiming1);
+    EXPECT_EQ(*cubicEaseInTiming1, *cubicEaseInTiming2);
+
+    RefPtr<TimingFunction> cubicEaseOutTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
+    RefPtr<TimingFunction> cubicEaseOutTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
+    EXPECT_EQ(*cubicEaseOutTiming1, *cubicEaseOutTiming1);
+    EXPECT_EQ(*cubicEaseOutTiming1, *cubicEaseOutTiming2);
+
+    RefPtr<TimingFunction> cubicEaseInOutTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
+    RefPtr<TimingFunction> cubicEaseInOutTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
+    EXPECT_EQ(*cubicEaseInOutTiming1, *cubicEaseInOutTiming1);
+    EXPECT_EQ(*cubicEaseInOutTiming1, *cubicEaseInOutTiming2);
+
+    RefPtr<TimingFunction> cubicCustomTiming1 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
+    RefPtr<TimingFunction> cubicCustomTiming2 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
+    EXPECT_EQ(*cubicCustomTiming1, *cubicCustomTiming1);
+    EXPECT_EQ(*cubicCustomTiming1, *cubicCustomTiming2);
+
+    Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
+    v.append(std::make_pair("cubicEaseInTiming1", cubicEaseInTiming1));
+    v.append(std::make_pair("cubicEaseOutTiming1", cubicEaseOutTiming1));
+    v.append(std::make_pair("cubicEaseInOutTiming1", cubicEaseInOutTiming1));
+    v.append(std::make_pair("cubicCustomTiming1", cubicCustomTiming1));
+    notEqualHelperLoop(v);
+}
+
+TEST_F(TimingFunctionTest, CubicOperatorEqReflectivity)
+{
+    RefPtr<TimingFunction> cubicA = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    RefPtr<TimingFunction> cubicB = CubicBezierTimingFunction::create(0.42, 0.0, 1.0, 1.0);
+    EXPECT_NE(*cubicA, *cubicB);
+    EXPECT_NE(*cubicB, *cubicA);
+}
+
+TEST_F(TimingFunctionTest, StepsOperatorEq)
+{
+    RefPtr<TimingFunction> stepsTimingStart1 = StepsTimingFunction::preset(StepsTimingFunction::Start);
+    RefPtr<TimingFunction> stepsTimingStart2 = StepsTimingFunction::preset(StepsTimingFunction::Start);
+    EXPECT_EQ(*stepsTimingStart1, *stepsTimingStart1);
+    EXPECT_EQ(*stepsTimingStart1, *stepsTimingStart2);
+
+    RefPtr<TimingFunction> stepsTimingEnd1 = StepsTimingFunction::preset(StepsTimingFunction::End);
+    RefPtr<TimingFunction> stepsTimingEnd2 = StepsTimingFunction::preset(StepsTimingFunction::End);
+    EXPECT_EQ(*stepsTimingEnd1, *stepsTimingEnd1);
+    EXPECT_EQ(*stepsTimingEnd1, *stepsTimingEnd2);
+
+    RefPtr<TimingFunction> stepsTimingCustom1 = StepsTimingFunction::create(5, StepsTimingFunction::StepAtStart);
+    RefPtr<TimingFunction> stepsTimingCustom2 = StepsTimingFunction::create(5, StepsTimingFunction::StepAtEnd);
+    RefPtr<TimingFunction> stepsTimingCustom3 = StepsTimingFunction::create(7, StepsTimingFunction::StepAtStart);
+    RefPtr<TimingFunction> stepsTimingCustom4 = StepsTimingFunction::create(7, StepsTimingFunction::StepAtEnd);
+
+    EXPECT_EQ(*StepsTimingFunction::create(5, StepsTimingFunction::StepAtStart), *stepsTimingCustom1);
+    EXPECT_EQ(*StepsTimingFunction::create(5, StepsTimingFunction::StepAtEnd), *stepsTimingCustom2);
+    EXPECT_EQ(*StepsTimingFunction::create(7, StepsTimingFunction::StepAtStart), *stepsTimingCustom3);
+    EXPECT_EQ(*StepsTimingFunction::create(7, StepsTimingFunction::StepAtEnd), *stepsTimingCustom4);
+
+    Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
+    v.append(std::make_pair("stepsTimingStart1", stepsTimingStart1));
+    v.append(std::make_pair("stepsTimingEnd1", stepsTimingEnd1));
+    v.append(std::make_pair("stepsTimingCustom1", stepsTimingCustom1));
+    v.append(std::make_pair("stepsTimingCustom2", stepsTimingCustom2));
+    v.append(std::make_pair("stepsTimingCustom3", stepsTimingCustom3));
+    v.append(std::make_pair("stepsTimingCustom4", stepsTimingCustom4));
+    notEqualHelperLoop(v);
+}
+
+TEST_F(TimingFunctionTest, StepsOperatorEqReflectivity)
+{
+    RefPtr<TimingFunction> stepsA = StepsTimingFunction::preset(StepsTimingFunction::Start);
+    RefPtr<TimingFunction> stepsB = StepsTimingFunction::create(1, StepsTimingFunction::StepAtStart);
+    EXPECT_NE(*stepsA, *stepsB);
+    EXPECT_NE(*stepsB, *stepsA);
+}
+
+TEST_F(TimingFunctionTest, LinearEvaluate)
+{
+    RefPtr<TimingFunction> linearTiming = LinearTimingFunction::create();
+    EXPECT_EQ(0.2, linearTiming->evaluate(0.2, 0));
+    EXPECT_EQ(0.6, linearTiming->evaluate(0.6, 0));
+}
+
+TEST_F(TimingFunctionTest, CubicEvaluate)
+{
+    double tolerance = 0.01;
+    RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
+    EXPECT_NEAR(0.418, cubicEaseTiming->evaluate(0.25, tolerance), tolerance);
+    EXPECT_NEAR(0.805, cubicEaseTiming->evaluate(0.50, tolerance), tolerance);
+    EXPECT_NEAR(0.960, cubicEaseTiming->evaluate(0.75, tolerance), tolerance);
+
+    RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    EXPECT_NEAR(0.093, cubicEaseInTiming->evaluate(0.25, tolerance), tolerance);
+    EXPECT_NEAR(0.305, cubicEaseInTiming->evaluate(0.50, tolerance), tolerance);
+    EXPECT_NEAR(0.620, cubicEaseInTiming->evaluate(0.75, tolerance), tolerance);
+
+    RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
+    EXPECT_NEAR(0.379, cubicEaseOutTiming->evaluate(0.25, tolerance), tolerance);
+    EXPECT_NEAR(0.694, cubicEaseOutTiming->evaluate(0.50, tolerance), tolerance);
+    EXPECT_NEAR(0.906, cubicEaseOutTiming->evaluate(0.75, tolerance), tolerance);
+
+    RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
+    EXPECT_NEAR(0.128, cubicEaseInOutTiming->evaluate(0.25, tolerance), tolerance);
+    EXPECT_NEAR(0.500, cubicEaseInOutTiming->evaluate(0.50, tolerance), tolerance);
+    EXPECT_NEAR(0.871, cubicEaseInOutTiming->evaluate(0.75, tolerance), tolerance);
+
+    RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
+    EXPECT_NEAR(0.034, cubicCustomTiming->evaluate(0.25, tolerance), tolerance);
+    EXPECT_NEAR(-0.217, cubicCustomTiming->evaluate(0.50, tolerance), tolerance);
+    EXPECT_NEAR(-0.335, cubicCustomTiming->evaluate(0.75, tolerance), tolerance);
+}
+
+TEST_F(TimingFunctionTest, StepsEvaluate)
+{
+    RefPtr<TimingFunction> stepsTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
+    EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.00, 0));
+    EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.20, 0));
+    EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.60, 0));
+    EXPECT_EQ(1.00, stepsTimingStart->evaluate(1.00, 0));
+
+    RefPtr<TimingFunction> stepsTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
+    EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.00, 0));
+    EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.49, 0));
+    EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(0.50, 0));
+    EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(1.00, 0));
+
+    RefPtr<TimingFunction> stepsTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
+    EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.00, 0));
+    EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.20, 0));
+    EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.60, 0));
+    EXPECT_EQ(1.00, stepsTimingEnd->evaluate(1.00, 0));
+
+    RefPtr<TimingFunction> stepsTimingCustomStart = StepsTimingFunction::create(4, StepsTimingFunction::StepAtStart);
+    EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.00, 0));
+    EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.24, 0));
+    EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.25, 0));
+    EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.49, 0));
+    EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.50, 0));
+    EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.74, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(0.75, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.00, 0));
+
+    RefPtr<TimingFunction> stepsTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::StepAtMiddle);
+    EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.00, 0));
+    EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.12, 0));
+    EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.13, 0));
+    EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.37, 0));
+    EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.38, 0));
+    EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.62, 0));
+    EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.63, 0));
+    EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.87, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(0.88, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(1.00, 0));
+
+    RefPtr<TimingFunction> stepsTimingCustomEnd = StepsTimingFunction::create(4, StepsTimingFunction::StepAtEnd);
+    EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.00, 0));
+    EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.24, 0));
+    EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.25, 0));
+    EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.49, 0));
+    EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.50, 0));
+    EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.74, 0));
+    EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.75, 0));
+    EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.99, 0));
+    EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(1.00, 0));
+}
+
+} // namespace
+
+} // namespace WebCore