cc/animation/animation_curve.h

   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_ANIMATION_CURVE_H_
   6 #define CC_ANIMATION_ANIMATION_CURVE_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "cc/base/cc_export.h"
  10 #include "ui/gfx/transform.h"
  11
  12 namespace cc {
  13
  14 class FloatAnimationCurve;
  15 class TransformAnimationCurve;
  16 class TransformOperations;
  17
  18 // An animation curve is a function that returns a value given a time.
  19 // There are currently only two types of curve, float and transform.
  20 class CC_EXPORT AnimationCurve {
  21  public:
  22   enum CurveType { Float, Transform };
  23
  24   virtual ~AnimationCurve() {}
  25
  26   virtual double Duration() const = 0;
  27   virtual CurveType Type() const = 0;
  28   virtual scoped_ptr<AnimationCurve> Clone() const = 0;
  29
  30   const FloatAnimationCurve* ToFloatAnimationCurve() const;
  31   const TransformAnimationCurve* ToTransformAnimationCurve() const;
  32 };
  33
  34 class CC_EXPORT FloatAnimationCurve : public AnimationCurve {
  35  public:
  36   virtual ~FloatAnimationCurve() {}
  37
  38   virtual float GetValue(double t) const = 0;
  39
  40   // Partial Animation implementation.
  41   virtual CurveType Type() const OVERRIDE;
  42 };
  43
  44 class CC_EXPORT TransformAnimationCurve : public AnimationCurve {
  45  public:
  46   virtual ~TransformAnimationCurve() {}
  47
  48   virtual gfx::Transform GetValue(double t) const = 0;
  49
  50   // Partial Animation implementation.
  51   virtual CurveType Type() const OVERRIDE;
  52 };
  53
  54 }  // namespace cc
  55
  56 #endif  // CC_ANIMATION_ANIMATION_CURVE_H_