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/*
* 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 "cc/animation/timing_function.h"
#include "platform/PlatformExport.h"
#include "wtf/Assertions.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/StdLibExtras.h"
#include "wtf/text/WTFString.h"
namespace blink {
class PLATFORM_EXPORT TimingFunction : public RefCounted<TimingFunction> {
public:
using Type = cc::TimingFunction::Type;
virtual ~TimingFunction() {}
Type getType() 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;
// Create CC instance.
virtual std::unique_ptr<cc::TimingFunction> cloneToCC() 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;
}
~LinearTimingFunction() override {}
// TimingFunction implementation.
String toString() const override;
double evaluate(double fraction, double) const override;
void range(double* minValue, double* maxValue) const override;
std::unique_ptr<cc::TimingFunction> cloneToCC() const override;
private:
LinearTimingFunction() : TimingFunction(Type::LINEAR) {}
};
class PLATFORM_EXPORT CubicBezierTimingFunction final : public TimingFunction {
public:
using EaseType = cc::CubicBezierTimingFunction::EaseType;
static PassRefPtr<CubicBezierTimingFunction> create(double x1,
double y1,
double x2,
double y2) {
return adoptRef(new CubicBezierTimingFunction(x1, y1, x2, y2));
}
static CubicBezierTimingFunction* preset(EaseType easeType) {
DEFINE_STATIC_REF(
CubicBezierTimingFunction, ease,
(adoptRef(new CubicBezierTimingFunction(EaseType::EASE))));
DEFINE_STATIC_REF(
CubicBezierTimingFunction, easeIn,
(adoptRef(new CubicBezierTimingFunction(EaseType::EASE_IN))));
DEFINE_STATIC_REF(
CubicBezierTimingFunction, easeOut,
(adoptRef(new CubicBezierTimingFunction(EaseType::EASE_OUT))));
DEFINE_STATIC_REF(
CubicBezierTimingFunction, easeInOut,
(adoptRef(new CubicBezierTimingFunction(EaseType::EASE_IN_OUT))));
switch (easeType) {
case EaseType::EASE:
return ease;
case EaseType::EASE_IN:
return easeIn;
case EaseType::EASE_OUT:
return easeOut;
case EaseType::EASE_IN_OUT:
return easeInOut;
default:
NOTREACHED();
return nullptr;
}
}
~CubicBezierTimingFunction() override {}
// TimingFunction implementation.
String toString() const override;
double evaluate(double fraction, double accuracy) const override;
void range(double* minValue, double* maxValue) const override;
std::unique_ptr<cc::TimingFunction> cloneToCC() const override;
double x1() const {
DCHECK_EQ(getEaseType(), EaseType::CUSTOM);
return m_x1;
}
double y1() const {
DCHECK_EQ(getEaseType(), EaseType::CUSTOM);
return m_y1;
}
double x2() const {
DCHECK_EQ(getEaseType(), EaseType::CUSTOM);
return m_x2;
}
double y2() const {
DCHECK_EQ(getEaseType(), EaseType::CUSTOM);
return m_y2;
}
EaseType getEaseType() const { return m_bezier->ease_type(); }
private:
explicit CubicBezierTimingFunction(EaseType easeType)
: TimingFunction(Type::CUBIC_BEZIER),
m_bezier(cc::CubicBezierTimingFunction::CreatePreset(easeType)),
m_x1(),
m_y1(),
m_x2(),
m_y2() {}
CubicBezierTimingFunction(double x1, double y1, double x2, double y2)
: TimingFunction(Type::CUBIC_BEZIER),
m_bezier(cc::CubicBezierTimingFunction::Create(x1, y1, x2, y2)),
m_x1(x1),
m_y1(y1),
m_x2(x2),
m_y2(y2) {}
std::unique_ptr<cc::CubicBezierTimingFunction> m_bezier;
// TODO(loyso): Get these values from m_bezier->bezier_ (gfx::CubicBezier)
const double m_x1;
const double m_y1;
const double m_x2;
const double m_y2;
};
class PLATFORM_EXPORT StepsTimingFunction final : public TimingFunction {
public:
using StepPosition = cc::StepsTimingFunction::StepPosition;
static PassRefPtr<StepsTimingFunction> create(int steps,
StepPosition stepPosition) {
return adoptRef(new StepsTimingFunction(steps, stepPosition));
}
static StepsTimingFunction* preset(StepPosition position) {
DEFINE_STATIC_REF(StepsTimingFunction, start,
create(1, StepPosition::START));
DEFINE_STATIC_REF(StepsTimingFunction, middle,
create(1, StepPosition::MIDDLE));
DEFINE_STATIC_REF(StepsTimingFunction, end, create(1, StepPosition::END));
switch (position) {
case StepPosition::START:
return start;
case StepPosition::MIDDLE:
return middle;
case StepPosition::END:
return end;
default:
NOTREACHED();
return end;
}
}
~StepsTimingFunction() override {}
// TimingFunction implementation.
String toString() const override;
double evaluate(double fraction, double) const override;
void range(double* minValue, double* maxValue) const override;
std::unique_ptr<cc::TimingFunction> cloneToCC() const override;
int numberOfSteps() const { return m_steps->steps(); }
StepPosition getStepPosition() const { return m_steps->step_position(); }
private:
StepsTimingFunction(int steps, StepPosition stepPosition)
: TimingFunction(Type::STEPS),
m_steps(cc::StepsTimingFunction::Create(steps, stepPosition)) {}
std::unique_ptr<cc::StepsTimingFunction> m_steps;
};
PLATFORM_EXPORT PassRefPtr<TimingFunction> createCompositorTimingFunctionFromCC(
const cc::TimingFunction*);
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, enumName) \
DEFINE_TYPE_CASTS(typeName##TimingFunction, TimingFunction, value, \
value->getType() == TimingFunction::Type::enumName, \
value.getType() == TimingFunction::Type::enumName)
DEFINE_TIMING_FUNCTION_TYPE_CASTS(Linear, LINEAR);
DEFINE_TIMING_FUNCTION_TYPE_CASTS(CubicBezier, CUBIC_BEZIER);
DEFINE_TIMING_FUNCTION_TYPE_CASTS(Steps, STEPS);
} // namespace blink
#endif // TimingFunction_h
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