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 "cc/output/filter_operations.h"
  11 #include "ui/gfx/transform.h"
  12
  13 namespace gfx {
  14 class BoxF;
  15 }
  16
  17 namespace cc {
  18
  19 class ColorAnimationCurve;
  20 class FilterAnimationCurve;
  21 class FloatAnimationCurve;
  22 class ScrollOffsetAnimationCurve;
  23 class TransformAnimationCurve;
  24 class TransformOperations;
  25
  26 // An animation curve is a function that returns a value given a time.
  27 class 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
  46 class 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
  56 class 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
  66 class 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   // Returns true if this animation is a translation.
  82   virtual bool IsTranslation() const = 0;
  83
  84   // Set |max_scale| to the maximum scale along any dimension during this
  85   // animation. Returns false if the maximum scale cannot be computed.
  86   virtual bool MaximumScale(float* max_scale) const = 0;
  87
  88   // Partial Animation implementation.
  89   virtual CurveType Type() const OVERRIDE;
  90 };
  91
  92 class CC_EXPORT FilterAnimationCurve : public AnimationCurve {
  93  public:
  94   virtual ~FilterAnimationCurve() {}
  95
  96   virtual FilterOperations GetValue(double t) const = 0;
  97   virtual bool HasFilterThatMovesPixels() const = 0;
  98
  99   // Partial Animation implementation.
 100   virtual CurveType Type() const OVERRIDE;
 101 };
 102
 103 }  // namespace cc
 104
 105 #endif  // CC_ANIMATION_ANIMATION_CURVE_H_