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      1 // Copyright 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_ANIMATION_TIMING_FUNCTION_H_
      6 #define CC_ANIMATION_TIMING_FUNCTION_H_
      7 
      8 #include "cc/base/cc_export.h"
      9 #include "ui/gfx/geometry/cubic_bezier.h"
     10 
     11 namespace cc {
     12 
     13 // See http://www.w3.org/TR/css3-transitions/.
     14 class CC_EXPORT TimingFunction {
     15  public:
     16   virtual ~TimingFunction();
     17 
     18   virtual float GetValue(double t) const = 0;
     19   virtual float Velocity(double time) const = 0;
     20   // The smallest and largest values returned by GetValue for inputs in [0, 1].
     21   virtual void Range(float* min, float* max) const = 0;
     22   virtual scoped_ptr<TimingFunction> Clone() const = 0;
     23 
     24  protected:
     25   TimingFunction();
     26 
     27  private:
     28   DISALLOW_ASSIGN(TimingFunction);
     29 };
     30 
     31 class CC_EXPORT CubicBezierTimingFunction : public TimingFunction {
     32  public:
     33   static scoped_ptr<CubicBezierTimingFunction> Create(double x1, double y1,
     34                                                       double x2, double y2);
     35   virtual ~CubicBezierTimingFunction();
     36 
     37   // TimingFunction implementation.
     38   virtual float GetValue(double time) const OVERRIDE;
     39   virtual float Velocity(double time) const OVERRIDE;
     40   virtual void Range(float* min, float* max) const OVERRIDE;
     41   virtual scoped_ptr<TimingFunction> Clone() const OVERRIDE;
     42 
     43  protected:
     44   CubicBezierTimingFunction(double x1, double y1, double x2, double y2);
     45 
     46   gfx::CubicBezier bezier_;
     47 
     48  private:
     49   DISALLOW_ASSIGN(CubicBezierTimingFunction);
     50 };
     51 
     52 class CC_EXPORT EaseTimingFunction {
     53  public:
     54   static scoped_ptr<TimingFunction> Create();
     55 
     56  private:
     57   DISALLOW_IMPLICIT_CONSTRUCTORS(EaseTimingFunction);
     58 };
     59 
     60 class CC_EXPORT EaseInTimingFunction {
     61  public:
     62   static scoped_ptr<TimingFunction> Create();
     63 
     64  private:
     65   DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInTimingFunction);
     66 };
     67 
     68 class CC_EXPORT EaseOutTimingFunction {
     69  public:
     70   static scoped_ptr<TimingFunction> Create();
     71 
     72  private:
     73   DISALLOW_IMPLICIT_CONSTRUCTORS(EaseOutTimingFunction);
     74 };
     75 
     76 class CC_EXPORT EaseInOutTimingFunction {
     77  public:
     78   static scoped_ptr<TimingFunction> Create();
     79 
     80  private:
     81   DISALLOW_IMPLICIT_CONSTRUCTORS(EaseInOutTimingFunction);
     82 };
     83 
     84 }  // namespace cc
     85 
     86 #endif  // CC_ANIMATION_TIMING_FUNCTION_H_
     87