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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 <memory>
#include "base/macros.h"
#include "cc/animation/animation_export.h"
#include "ui/gfx/geometry/cubic_bezier.h"
namespace cc {
// See http://www.w3.org/TR/css3-transitions/.
class CC_ANIMATION_EXPORT TimingFunction {
public:
virtual ~TimingFunction();
// Note that LINEAR is a nullptr TimingFunction (for now).
enum class Type { LINEAR, CUBIC_BEZIER, STEPS };
virtual Type GetType() const = 0;
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 std::unique_ptr<TimingFunction> Clone() const = 0;
protected:
TimingFunction();
DISALLOW_ASSIGN(TimingFunction);
};
class CC_ANIMATION_EXPORT CubicBezierTimingFunction : public TimingFunction {
public:
enum class EaseType { EASE, EASE_IN, EASE_OUT, EASE_IN_OUT, CUSTOM };
static std::unique_ptr<CubicBezierTimingFunction> CreatePreset(
EaseType ease_type);
static std::unique_ptr<CubicBezierTimingFunction> Create(double x1,
double y1,
double x2,
double y2);
~CubicBezierTimingFunction() override;
// TimingFunction implementation.
Type GetType() const override;
float GetValue(double time) const override;
float Velocity(double time) const override;
void Range(float* min, float* max) const override;
std::unique_ptr<TimingFunction> Clone() const override;
EaseType ease_type() const { return ease_type_; }
const gfx::CubicBezier& bezier() const { return bezier_; }
private:
CubicBezierTimingFunction(EaseType ease_type,
double x1,
double y1,
double x2,
double y2);
gfx::CubicBezier bezier_;
EaseType ease_type_;
DISALLOW_ASSIGN(CubicBezierTimingFunction);
};
class CC_ANIMATION_EXPORT StepsTimingFunction : public TimingFunction {
public:
// Web Animations specification, 3.12.4. Timing in discrete steps.
enum class StepPosition { START, MIDDLE, END };
static std::unique_ptr<StepsTimingFunction> Create(
int steps,
StepPosition step_position);
~StepsTimingFunction() override;
// TimingFunction implementation.
Type GetType() const override;
float GetValue(double t) const override;
std::unique_ptr<TimingFunction> Clone() const override;
void Range(float* min, float* max) const override;
float Velocity(double time) const override;
int steps() const { return steps_; }
StepPosition step_position() const { return step_position_; }
double GetPreciseValue(double t) const;
private:
StepsTimingFunction(int steps, StepPosition step_position);
float GetStepsStartOffset() const;
int steps_;
StepPosition step_position_;
DISALLOW_ASSIGN(StepsTimingFunction);
};
} // namespace cc
#endif // CC_ANIMATION_TIMING_FUNCTION_H_
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