/* * 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 SKY_ENGINE_PLATFORM_ANIMATION_TIMINGFUNCTION_H_ #define SKY_ENGINE_PLATFORM_ANIMATION_TIMINGFUNCTION_H_ #include #include "flutter/sky/engine/platform/animation/AnimationUtilities.h" #include "flutter/sky/engine/platform/animation/UnitBezier.h" #include "flutter/sky/engine/wtf/OwnPtr.h" #include "flutter/sky/engine/wtf/PassOwnPtr.h" #include "flutter/sky/engine/wtf/PassRefPtr.h" #include "flutter/sky/engine/wtf/RefCounted.h" #include "flutter/sky/engine/wtf/StdLibExtras.h" #include "flutter/sky/engine/wtf/text/StringBuilder.h" #include "flutter/sky/engine/wtf/text/WTFString.h" namespace blink { class PLATFORM_EXPORT TimingFunction : public RefCounted { public: enum Type { LinearFunction, CubicBezierFunction, StepsFunction }; virtual ~TimingFunction() {} Type type() const { return m_type; } virtual String toString() const = 0; // 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; // This function returns the minimum and maximum values obtainable when // calling evaluate(); virtual void range(double* minValue, double* maxValue) const = 0; protected: TimingFunction(Type type) : m_type(type) {} private: Type m_type; }; class PLATFORM_EXPORT LinearTimingFunction final : public TimingFunction { public: static LinearTimingFunction* shared() { DEFINE_STATIC_REF(LinearTimingFunction, linear, (adoptRef(new LinearTimingFunction()))); return linear; } virtual ~LinearTimingFunction() {} virtual String toString() const override; virtual double evaluate(double fraction, double) const override; virtual void range(double* minValue, double* maxValue) const override; private: LinearTimingFunction() : TimingFunction(LinearFunction) {} }; class PLATFORM_EXPORT CubicBezierTimingFunction final : public TimingFunction { public: enum SubType { Ease, EaseIn, EaseOut, EaseInOut, Custom }; static PassRefPtr 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: { DEFINE_STATIC_REF(CubicBezierTimingFunction, ease, (adoptRef(new CubicBezierTimingFunction( Ease, 0.25, 0.1, 0.25, 1.0)))); return ease; } case EaseIn: { DEFINE_STATIC_REF(CubicBezierTimingFunction, easeIn, (adoptRef(new CubicBezierTimingFunction( EaseIn, 0.42, 0.0, 1.0, 1.0)))); return easeIn; } case EaseOut: { DEFINE_STATIC_REF(CubicBezierTimingFunction, easeOut, (adoptRef(new CubicBezierTimingFunction( EaseOut, 0.0, 0.0, 0.58, 1.0)))); return easeOut; } case EaseInOut: { DEFINE_STATIC_REF(CubicBezierTimingFunction, easeInOut, (adoptRef(new CubicBezierTimingFunction( EaseInOut, 0.42, 0.0, 0.58, 1.0)))); return easeInOut; } default: ASSERT_NOT_REACHED(); return 0; } } virtual ~CubicBezierTimingFunction() {} virtual String toString() const override; virtual double evaluate(double fraction, double accuracy) const override; virtual void range(double* minValue, double* maxValue) const override; 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 m_bezier; }; class PLATFORM_EXPORT StepsTimingFunction final : public TimingFunction { public: enum SubType { Start, End, Middle, Custom }; enum StepAtPosition { StepAtStart, StepAtMiddle, StepAtEnd }; static PassRefPtr create(int steps, StepAtPosition stepAtPosition) { return adoptRef(new StepsTimingFunction(Custom, steps, stepAtPosition)); } static StepsTimingFunction* preset(SubType subType) { switch (subType) { case Start: { DEFINE_STATIC_REF( StepsTimingFunction, start, (adoptRef(new StepsTimingFunction(Start, 1, StepAtStart)))); return start; } case Middle: { DEFINE_STATIC_REF( StepsTimingFunction, middle, (adoptRef(new StepsTimingFunction(Middle, 1, StepAtMiddle)))); return middle; } case End: { DEFINE_STATIC_REF( StepsTimingFunction, end, (adoptRef(new StepsTimingFunction(End, 1, StepAtEnd)))); return end; } default: ASSERT_NOT_REACHED(); return 0; } } virtual ~StepsTimingFunction() {} virtual String toString() const override; virtual double evaluate(double fraction, double) const override; virtual void range(double* minValue, double* maxValue) const override; int numberOfSteps() const { return m_steps; } StepAtPosition stepAtPosition() const { return m_stepAtPosition; } SubType subType() const { return m_subType; } private: StepsTimingFunction(SubType subType, int steps, StepAtPosition stepAtPosition) : TimingFunction(StepsFunction), m_steps(steps), m_stepAtPosition(stepAtPosition), m_subType(subType) {} int m_steps; StepAtPosition m_stepAtPosition; SubType m_subType; }; PLATFORM_EXPORT bool operator==(const LinearTimingFunction&, const TimingFunction&); PLATFORM_EXPORT bool operator==(const CubicBezierTimingFunction&, const TimingFunction&); PLATFORM_EXPORT bool operator==(const StepsTimingFunction&, const TimingFunction&); PLATFORM_EXPORT bool operator==(const TimingFunction&, const TimingFunction&); PLATFORM_EXPORT bool operator!=(const TimingFunction&, const TimingFunction&); #define DEFINE_TIMING_FUNCTION_TYPE_CASTS(typeName) \ DEFINE_TYPE_CASTS(typeName##TimingFunction, TimingFunction, value, \ value->type() == TimingFunction::typeName##Function, \ value.type() == TimingFunction::typeName##Function) DEFINE_TIMING_FUNCTION_TYPE_CASTS(Linear); DEFINE_TIMING_FUNCTION_TYPE_CASTS(CubicBezier); DEFINE_TIMING_FUNCTION_TYPE_CASTS(Steps); } // namespace blink #endif // SKY_ENGINE_PLATFORM_ANIMATION_TIMINGFUNCTION_H_