Move TimingFunction.h to platform/

Source/core/platform/animation/TimingFunction.h

-/*
- * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
- *           (C) 2000 Antti Koivisto (koivisto@kde.org)
- *           (C) 2000 Dirk Mueller (mueller@kde.org)
- * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef TimingFunction_h
-#define TimingFunction_h
-
-#include "RuntimeEnabledFeatures.h"
-#include "platform/animation/AnimationUtilities.h" // For blend()
-#include "platform/animation/UnitBezier.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/Vector.h"
-#include <algorithm>
-
-
-namespace WebCore {
-
-class TimingFunction : public RefCounted<TimingFunction> {
-public:
-
-    enum Type {
-        LinearFunction, CubicBezierFunction, StepsFunction, ChainedFunction
-    };
-
-    virtual ~TimingFunction() { }
-
-    Type type() const { return m_type; }
-
-    // Evaluates the timing function at the given fraction. The accuracy parameter provides a hint as to the required
-    // accuracy and is not guaranteed.
-    virtual double evaluate(double fraction, double accuracy) const = 0;
-
-protected:
-    TimingFunction(Type type)
-        : m_type(type)
-    {
-    }
-
-private:
-    Type m_type;
-};
-
-class LinearTimingFunction : public TimingFunction {
-public:
-    static PassRefPtr<LinearTimingFunction> create()
-    {
-        return adoptRef(new LinearTimingFunction);
-    }
-
-    ~LinearTimingFunction() { }
-
-    virtual double evaluate(double fraction, double) const
-    {
-        ASSERT(RuntimeEnabledFeatures::webAnimationsEnabled() || (fraction >= 0 && fraction <= 1));
-        ASSERT_WITH_MESSAGE(!RuntimeEnabledFeatures::webAnimationsEnabled() || (fraction >= 0 && fraction <= 1), "Web Animations not yet implemented: Timing function behavior outside the range [0, 1] is not yet specified");
-        return fraction;
-    }
-
-private:
-    LinearTimingFunction()
-        : TimingFunction(LinearFunction)
-    {
-    }
-};
-
-
-// Forward declare so we can friend it below. Don't use in production code!
-class ChainedTimingFunctionTestHelper;
-
-class CubicBezierTimingFunction : public TimingFunction {
-public:
-    enum SubType {
-        Ease,
-        EaseIn,
-        EaseOut,
-        EaseInOut,
-        Custom
-    };
-
-    static PassRefPtr<CubicBezierTimingFunction> create(double x1, double y1, double x2, double y2)
-    {
-        return adoptRef(new CubicBezierTimingFunction(Custom, x1, y1, x2, y2));
-    }
-
-    static CubicBezierTimingFunction* preset(SubType subType)
-    {
-        switch (subType) {
-        case Ease:
-            {
-                static CubicBezierTimingFunction* ease = adoptRef(new CubicBezierTimingFunction(Ease, 0.25, 0.1, 0.25, 1.0)).leakRef();
-                return ease;
-            }
-        case EaseIn:
-            {
-                static CubicBezierTimingFunction* easeIn = adoptRef(new CubicBezierTimingFunction(EaseIn, 0.42, 0.0, 1.0, 1.0)).leakRef();
-                return easeIn;
-            }
-        case EaseOut:
-            {
-                static CubicBezierTimingFunction* easeOut = adoptRef(new CubicBezierTimingFunction(EaseOut, 0.0, 0.0, 0.58, 1.0)).leakRef();
-                return easeOut;
-            }
-        case EaseInOut:
-            {
-                static CubicBezierTimingFunction* easeInOut = adoptRef(new CubicBezierTimingFunction(EaseInOut, 0.42, 0.0, 0.58, 1.0)).leakRef();
-                return easeInOut;
-            }
-        default:
-            ASSERT_NOT_REACHED();
-            return 0;
-        }
-    }
-
-    ~CubicBezierTimingFunction() { }
-
-    virtual double evaluate(double fraction, double accuracy) const
-    {
-        ASSERT(RuntimeEnabledFeatures::webAnimationsEnabled() || (fraction >= 0 && fraction <= 1));
-        ASSERT_WITH_MESSAGE(!RuntimeEnabledFeatures::webAnimationsEnabled() || (fraction >= 0 && fraction <= 1), "Web Animations not yet implemented: Timing function behavior outside the range [0, 1] is not yet specified");
-        if (!m_bezier)
-            m_bezier = adoptPtr(new UnitBezier(m_x1, m_y1, m_x2, m_y2));
-        return m_bezier->solve(fraction, accuracy);
-    }
-
-    double x1() const { return m_x1; }
-    double y1() const { return m_y1; }
-    double x2() const { return m_x2; }
-    double y2() const { return m_y2; }
-
-    SubType subType() const { return m_subType; }
-
-private:
-    explicit CubicBezierTimingFunction(SubType subType, double x1, double y1, double x2, double y2)
-        : TimingFunction(CubicBezierFunction)
-        , m_x1(x1)
-        , m_y1(y1)
-        , m_x2(x2)
-        , m_y2(y2)
-        , m_subType(subType)
-    {
-    }
-
-    double m_x1;
-    double m_y1;
-    double m_x2;
-    double m_y2;
-    SubType m_subType;
-    mutable OwnPtr<UnitBezier> m_bezier;
-};
-
-class StepsTimingFunction : public TimingFunction {
-public:
-    enum SubType {
-        Start,
-        End,
-        Custom
-    };
-
-    static PassRefPtr<StepsTimingFunction> create(int steps, bool stepAtStart)
-    {
-        return adoptRef(new StepsTimingFunction(Custom, steps, stepAtStart));
-    }
-
-    static StepsTimingFunction* preset(SubType subType)
-    {
-        switch (subType) {
-        case Start:
-            {
-                static StepsTimingFunction* start = adoptRef(new StepsTimingFunction(Start, 1, true)).leakRef();
-                return start;
-            }
-        case End:
-            {
-                static StepsTimingFunction* end = adoptRef(new StepsTimingFunction(End, 1, false)).leakRef();
-                return end;
-            }
-        default:
-            ASSERT_NOT_REACHED();
-            return 0;
-        }
-    }
-
-
-    ~StepsTimingFunction() { }
-
-    virtual double evaluate(double fraction, double) const
-    {
-        ASSERT(RuntimeEnabledFeatures::webAnimationsEnabled() || (fraction >= 0 && fraction <= 1));
-        ASSERT_WITH_MESSAGE(!RuntimeEnabledFeatures::webAnimationsEnabled() || (fraction >= 0 && fraction <= 1), "Web Animations not yet implemented: Timing function behavior outside the range [0, 1] is not yet specified");
-        return std::min(1.0, (floor(m_steps * fraction) + m_stepAtStart) / m_steps);
-    }
-
-    int numberOfSteps() const { return m_steps; }
-    bool stepAtStart() const { return m_stepAtStart; }
-
-    SubType subType() const { return m_subType; }
-
-private:
-    StepsTimingFunction(SubType subType, int steps, bool stepAtStart)
-        : TimingFunction(StepsFunction)
-        , m_steps(steps)
-        , m_stepAtStart(stepAtStart)
-        , m_subType(subType)
-    {
-    }
-
-    int m_steps;
-    bool m_stepAtStart;
-    SubType m_subType;
-};
-
-class ChainedTimingFunction : public TimingFunction {
-public:
-    static PassRefPtr<ChainedTimingFunction> create()
-    {
-        return adoptRef(new ChainedTimingFunction);
-    }
-
-    void appendSegment(double upperBound, TimingFunction* timingFunction)
-    {
-        double max = m_segments.isEmpty() ? 0 : m_segments.last().max();
-        ASSERT(upperBound > max);
-        m_segments.append(Segment(max, upperBound, timingFunction));
-    }
-    virtual double evaluate(double fraction, double accuracy) const
-    {
-        ASSERT_WITH_MESSAGE(fraction >= 0 && fraction <= 1, "Web Animations not yet implemented: Timing function behavior outside the range [0, 1] is not yet specified");
-        ASSERT(!m_segments.isEmpty());
-        ASSERT(m_segments.last().max() == 1);
-        size_t i = 0;
-        const Segment* segment = &m_segments[i++];
-        while (fraction >= segment->max() && i < m_segments.size()) {
-            segment = &m_segments[i++];
-        }
-        return segment->evaluate(fraction, accuracy);
-    }
-
-private:
-    class Segment {
-    public:
-        Segment(double min, double max, TimingFunction* timingFunction)
-            : m_min(min)
-            , m_max(max)
-            , m_timingFunction(timingFunction)
-        { ASSERT(timingFunction); }
-
-        double max() const { return m_max; }
-        double evaluate(double fraction, double accuracy) const
-        {
-            return scaleFromLocal(m_timingFunction->evaluate(scaleToLocal(fraction), accuracy));
-        }
-
-    private:
-        double scaleToLocal(double x) const { return (x - m_min) / (m_max - m_min); }
-        double scaleFromLocal(double x) const { return blend(m_min, m_max, x); }
-
-        double m_min;
-        double m_max;
-        RefPtr<TimingFunction> m_timingFunction;
-
-        // FIXME: Come up with a public API for the segments and remove this.
-        friend class CompositorAnimationsImpl;
-
-        // Allow the compositor to reverse the timing function.
-        friend class CompositorAnimationsTimingFunctionReverser;
-
-        // Allow PrintTo/operator== of the segments. Can be removed once
-        // ChainedTimingFunction has a public API for segments.
-        friend class ChainedTimingFunctionTestHelper;
-    };
-
-    ChainedTimingFunction()
-        : TimingFunction(ChainedFunction)
-    {
-        ASSERT(RuntimeEnabledFeatures::webAnimationsEnabled());
-    }
-
-    Vector<Segment> m_segments;
-
-    // FIXME: Come up with a public API for the segments and remove this.
-    friend class CompositorAnimationsImpl;
-
-    // Allow the compositor to reverse the timing function.
-    friend class CompositorAnimationsTimingFunctionReverser;
-
-    // Allow PrintTo/operator== of the segments. Can be removed once
-    // ChainedTimingFunction has a public API for segments.
-    friend class ChainedTimingFunctionTestHelper;
-};
-
-} // namespace WebCore
-
-#endif // TimingFunction_h