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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_ANIMATION_TIMING_FUNCTION_H_
#define CC_ANIMATION_TIMING_FUNCTION_H_
#include "cc/base/cc_export.h"
#include "ui/gfx/geometry/cubic_bezier.h"
namespace cc {
// See http://www.w3.org/TR/css3-transitions/.
class CC_EXPORT TimingFunction {
public:
virtual ~TimingFunction();
virtual float GetValue(double t) const = 0;
virtual float Velocity(double time) const = 0;
// The smallest and largest values returned by GetValue for inputs in [0, 1].
virtual void Range(float* min, float* max) const = 0;
virtual scoped_ptr<TimingFunction> Clone() const = 0;
protected:
TimingFunction();
private:
DISALLOW_ASSIGN(TimingFunction);
};
class CC_EXPORT CubicBezierTimingFunction : public TimingFunction {
public:
static scoped_ptr<CubicBezierTimingFunction> Create(double x1, double y1,
double x2, double y2);
~CubicBezierTimingFunction() override;
// TimingFunction implementation.
float GetValue(double time) const override;
float Velocity(double time) const override;
void Range(float* min, float* max) const override;
scoped_ptr<TimingFunction> Clone() const override;
protected:
CubicBezierTimingFunction(double x1, double y1, double x2, double y2);
gfx::CubicBezier bezier_;
private:
DISALLOW_ASSIGN(CubicBezierTimingFunction);
};
class CC_EXPORT EaseTimingFunction {
public:
static scoped_ptr<TimingFunction> Create();
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(EaseTimingFunction);
};
class CC_EXPORT EaseInTimingFunction {
public:
static scoped_ptr<TimingFunction> Create();
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInTimingFunction);
};
class CC_EXPORT EaseOutTimingFunction {
public:
static scoped_ptr<TimingFunction> Create();
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(EaseOutTimingFunction);
};
class CC_EXPORT EaseInOutTimingFunction {
public:
static scoped_ptr<TimingFunction> Create();
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInOutTimingFunction);
};
class CC_EXPORT StepsTimingFunction : public TimingFunction {
public:
static scoped_ptr<StepsTimingFunction> Create(int steps,
float steps_start_offset);
~StepsTimingFunction() override;
float GetValue(double t) const override;
scoped_ptr<TimingFunction> Clone() const override;
void Range(float* min, float* max) const override;
float Velocity(double time) const override;
protected:
StepsTimingFunction(int steps, float steps_start_offset);
private:
int steps_;
float steps_start_offset_;
DISALLOW_ASSIGN(StepsTimingFunction);
};
} // namespace cc
#endif // CC_ANIMATION_TIMING_FUNCTION_H_
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