Creating a helper class for reversing timing functions.

Source/core/animation/CompositorAnimationsTimingFunctionReverserTest.cpp

Index: Source/core/animation/CompositorAnimationsTimingFunctionReverserTest.cpp
diff --git a/Source/core/animation/CompositorAnimationsTimingFunctionReverserTest.cpp b/Source/core/animation/CompositorAnimationsTimingFunctionReverserTest.cpp
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+++ b/Source/core/animation/CompositorAnimationsTimingFunctionReverserTest.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 "core/animation/CompositorAnimations.h"
+
+#include "core/platform/animation/TimingFunctionTestHelper.h"
+
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+// FIXME: Remove once https://codereview.chromium.org/50603011/ lands.
+#define EXPECT_REFV_EQ(a, b) EXPECT_EQ(*(a.get()), *(b.get()))
+#define EXPECT_REFV_NE(a, b) EXPECT_NE(*(a.get()), *(b.get()))
+
+namespace {
+
+using namespace WebCore;
+
+class CoreAnimationCompositorAnimationsTimingFunctionReverserTest : public ::testing::Test {
+protected:
+    bool m_enabled;
+
+    virtual void SetUp()
+    {
+        m_enabled = RuntimeEnabledFeatures::webAnimationsEnabled();
+        // Needed for ChainedTimingFunction support
+        RuntimeEnabledFeatures::setWebAnimationsEnabled(true);
+    }
+
+    virtual void TearDown()
+    {
+        RuntimeEnabledFeatures::setWebAnimationsEnabled(m_enabled);
+    }
+
+public:
+    PassRefPtr<TimingFunction> reverse(const RefPtr<TimingFunction>& timefunc)
+    {
+        return CompositorAnimationsTimingFunctionReverser::reverse(timefunc.get());
+    }
+};
+
+TEST_F(CoreAnimationCompositorAnimationsTimingFunctionReverserTest, LinearReverse)
+{
+    RefPtr<TimingFunction> linearTiming = LinearTimingFunction::create();
+    EXPECT_REFV_EQ(linearTiming, reverse(linearTiming));
+}
+
+TEST_F(CoreAnimationCompositorAnimationsTimingFunctionReverserTest, CubicReverse)
+{
+    RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
+    RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
+
+    EXPECT_REFV_EQ(cubicEaseOutTiming, reverse(cubicEaseInTiming));
+    EXPECT_REFV_EQ(cubicEaseInTiming, reverse(cubicEaseOutTiming));
+    EXPECT_REFV_EQ(cubicEaseInOutTiming, reverse(cubicEaseInOutTiming));
+
+    RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
+    // Due to floating point, 1.0-(-1.73) != 2.73
+    RefPtr<TimingFunction> cubicCustomTimingReversed = CubicBezierTimingFunction::create(0, 1.0 - (-1.73), 1.0 - 0.17, 1.0 - 0.67);
+    EXPECT_REFV_EQ(cubicCustomTimingReversed, reverse(cubicCustomTiming));
+
+    RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
+    RefPtr<TimingFunction> cubicEaseTimingReversed = CubicBezierTimingFunction::create(1.0 - 0.25, 0.0, 1.0 - 0.25, 1.0 - 0.1);
+    EXPECT_REFV_EQ(cubicEaseTimingReversed, reverse(cubicEaseTiming));
+}
+
+TEST_F(CoreAnimationCompositorAnimationsTimingFunctionReverserTest, ChainedReverse)
+{
+    RefPtr<TimingFunction> linearTiming = LinearTimingFunction::create();
+    RefPtr<ChainedTimingFunction> chainedLinearSingle = ChainedTimingFunction::create();
+    chainedLinearSingle->appendSegment(1.0, linearTiming.get());
+    EXPECT_REFV_EQ(chainedLinearSingle, reverse(chainedLinearSingle));
+
+    RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
+    RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
+
+    RefPtr<ChainedTimingFunction> chainedMixed = ChainedTimingFunction::create();
+    chainedMixed->appendSegment(0.75, chainedLinearSingle.get());
+    chainedMixed->appendSegment(1.0, cubicEaseInTiming.get());
+
+    RefPtr<ChainedTimingFunction> chainedMixedReversed = ChainedTimingFunction::create();
+    chainedMixedReversed->appendSegment(0.25, cubicEaseOutTiming.get());
+    chainedMixedReversed->appendSegment(1.0, chainedLinearSingle.get());
+    EXPECT_REFV_EQ(chainedMixedReversed, reverse(chainedMixed));
+}
+
+} // namespace