animation_curve.h revision e5d81f57cb97b3b6b7fccc9c5610d21eb81db09d 
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 "cc/output/filter_operations.h"
11#include "ui/gfx/transform.h"
12
13namespace gfx {
14class BoxF;
15}
16
17namespace cc {
18
19class ColorAnimationCurve;
20class FilterAnimationCurve;
21class FloatAnimationCurve;
22class ScrollOffsetAnimationCurve;
23class TransformAnimationCurve;
24class TransformOperations;
25
26// An animation curve is a function that returns a value given a time.
27class CC_EXPORT AnimationCurve {
28 public:
29  enum CurveType { Color, Float, Transform, Filter, ScrollOffset };
30
31  virtual ~AnimationCurve() {}
32
33  virtual double Duration() const = 0;
34  virtual CurveType Type() const = 0;
35  virtual scoped_ptr<AnimationCurve> Clone() const = 0;
36
37  const ColorAnimationCurve* ToColorAnimationCurve() const;
38  const FloatAnimationCurve* ToFloatAnimationCurve() const;
39  const TransformAnimationCurve* ToTransformAnimationCurve() const;
40  const FilterAnimationCurve* ToFilterAnimationCurve() const;
41  const ScrollOffsetAnimationCurve* ToScrollOffsetAnimationCurve() const;
42
43  ScrollOffsetAnimationCurve* ToScrollOffsetAnimationCurve();
44};
45
46class CC_EXPORT ColorAnimationCurve : public AnimationCurve {
47 public:
48  virtual ~ColorAnimationCurve() {}
49
50  virtual SkColor GetValue(double t) const = 0;
51
52  // Partial Animation implementation.
53  virtual CurveType Type() const OVERRIDE;
54};
55
56class CC_EXPORT FloatAnimationCurve : public AnimationCurve {
57 public:
58  virtual ~FloatAnimationCurve() {}
59
60  virtual float GetValue(double t) const = 0;
61
62  // Partial Animation implementation.
63  virtual CurveType Type() const OVERRIDE;
64};
65
66class CC_EXPORT TransformAnimationCurve : public AnimationCurve {
67 public:
68  virtual ~TransformAnimationCurve() {}
69
70  virtual gfx::Transform GetValue(double t) const = 0;
71
72  // Sets |bounds| to be the bounding box for the region within which |box|
73  // will move during this animation. If this region cannot be computed,
74  // returns false.
75  virtual bool AnimatedBoundsForBox(const gfx::BoxF& box,
76                                    gfx::BoxF* bounds) const = 0;
77
78  // Returns true if this animation affects scale.
79  virtual bool AffectsScale() const = 0;
80
81  // Partial Animation implementation.
82  virtual CurveType Type() const OVERRIDE;
83};
84
85class CC_EXPORT FilterAnimationCurve : public AnimationCurve {
86 public:
87  virtual ~FilterAnimationCurve() {}
88
89  virtual FilterOperations GetValue(double t) const = 0;
90  virtual bool HasFilterThatMovesPixels() const = 0;
91
92  // Partial Animation implementation.
93  virtual CurveType Type() const OVERRIDE;
94};
95
96}  // namespace cc
97
98#endif  // CC_ANIMATION_ANIMATION_CURVE_H_
99