Home | History | Annotate | Download | only in animation 
      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef KeyframeAnimationEffect_h
     32 #define KeyframeAnimationEffect_h
     33 
     34 #include "core/animation/AnimatableValue.h"
     35 #include "core/animation/AnimationEffect.h"
     36 #include "wtf/HashMap.h"
     37 #include "wtf/HashSet.h"
     38 #include "wtf/PassOwnPtr.h"
     39 #include "wtf/PassRefPtr.h"
     40 #include "wtf/RefCounted.h"
     41 #include "wtf/Vector.h"
     42 
     43 namespace WebCore {
     44 
     45 typedef HashSet<CSSPropertyID> PropertySet;
     46 
     47 // Represents the keyframes set through the API.
     48 class Keyframe : public RefCounted<Keyframe> {
     49 public:
     50     static PassRefPtr<Keyframe> create()
     51     {
     52         return adoptRef(new Keyframe);
     53     }
     54     static bool compareOffsets(const RefPtr<Keyframe>& a, const RefPtr<Keyframe>& b)
     55     {
     56         return a->offset() < b->offset();
     57     }
     58     void setOffset(double offset) { m_offset = offset; }
     59     double offset() const { return m_offset; }
     60     void setComposite(AnimationEffect::CompositeOperation composite) { m_composite = composite; }
     61     AnimationEffect::CompositeOperation composite() const { return m_composite; }
     62     void setPropertyValue(CSSPropertyID, const AnimatableValue*);
     63     const AnimatableValue* propertyValue(CSSPropertyID) const;
     64     PropertySet properties() const;
     65 private:
     66     Keyframe();
     67     double m_offset;
     68     AnimationEffect::CompositeOperation m_composite;
     69     typedef HashMap<CSSPropertyID, RefPtr<AnimatableValue> > PropertyValueMap;
     70     PropertyValueMap m_propertyValues;
     71 };
     72 
     73 class KeyframeAnimationEffect : public AnimationEffect {
     74 public:
     75     typedef Vector<RefPtr<Keyframe> > KeyframeVector;
     76     // FIXME: Implement accumulation.
     77     static PassRefPtr<KeyframeAnimationEffect> create(const KeyframeVector& keyframes)
     78     {
     79         return adoptRef(new KeyframeAnimationEffect(keyframes));
     80     }
     81 
     82     // AnimationEffect implementation.
     83     virtual PassOwnPtr<CompositableValueMap> sample(int iteration, double fraction) const OVERRIDE;
     84 
     85     // FIXME: Implement setFrames()
     86     const KeyframeVector& getFrames() const { return m_keyframes; }
     87 
     88 private:
     89     class PropertySpecificKeyframe {
     90     public:
     91         PropertySpecificKeyframe(double offset, const AnimatableValue*, CompositeOperation);
     92         double offset() const { return m_offset; }
     93         const CompositableValue* value() const { return m_value.get(); }
     94         PassOwnPtr<PropertySpecificKeyframe> cloneWithOffset(double offset) const;
     95     private:
     96         // Used by cloneWithOffset().
     97         PropertySpecificKeyframe(double offset, PassRefPtr<CompositableValue>);
     98         double m_offset;
     99         RefPtr<CompositableValue> m_value;
    100     };
    101 
    102     class PropertySpecificKeyframeGroup {
    103     public:
    104         void appendKeyframe(PassOwnPtr<PropertySpecificKeyframe>);
    105         void removeRedundantKeyframes();
    106         void addSyntheticKeyframeIfRequired();
    107         PassRefPtr<CompositableValue> sample(int iteration, double offset) const;
    108     private:
    109         typedef Vector<OwnPtr<PropertySpecificKeyframe> > PropertySpecificKeyframeVector;
    110         PropertySpecificKeyframeVector m_keyframes;
    111     };
    112 
    113     KeyframeAnimationEffect(const KeyframeVector& keyframes);
    114 
    115     KeyframeVector normalizedKeyframes() const;
    116     // Lazily computes the groups of property-specific keyframes.
    117     void ensureKeyframeGroups();
    118 
    119     KeyframeVector m_keyframes;
    120     // The spec describes filtering the normalized keyframes at sampling time
    121     // to get the 'property-specific keyframes'. For efficiency, we cache the
    122     // property-specific lists.
    123     typedef HashMap<CSSPropertyID, OwnPtr<PropertySpecificKeyframeGroup> > KeyframeGroupMap;
    124     OwnPtr<KeyframeGroupMap> m_keyframeGroups;
    125 };
    126 
    127 } // namespace WebCore
    128 
    129 #endif // KeyframeAnimationEffect_h
    130