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      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
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     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,
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     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 AnimatableValue_h
     32 #define AnimatableValue_h
     33 
     34 #include "core/css/CSSValue.h"
     35 #include "platform/heap/Handle.h"
     36 #include "wtf/RefCounted.h"
     37 
     38 namespace blink {
     39 
     40 class AnimatableValue : public RefCountedWillBeGarbageCollectedFinalized<AnimatableValue> {
     41 public:
     42     virtual ~AnimatableValue() { }
     43 
     44     static const AnimatableValue* neutralValue();
     45 
     46     static PassRefPtrWillBeRawPtr<AnimatableValue> interpolate(const AnimatableValue*, const AnimatableValue*, double fraction);
     47     static double distance(const AnimatableValue* from, const AnimatableValue* to);
     48     static bool usesDefaultInterpolation(const AnimatableValue* from, const AnimatableValue* to)
     49     {
     50         return !from->isSameType(to) || from->usesDefaultInterpolationWith(to);
     51     }
     52 
     53     bool equals(const AnimatableValue* value) const
     54     {
     55         return isSameType(value) && equalTo(value);
     56     }
     57     bool equals(const AnimatableValue& value) const
     58     {
     59         return equals(&value);
     60     }
     61 
     62     bool isClipPathOperation() const { return type() == TypeClipPathOperation; }
     63     bool isColor() const { return type() == TypeColor; }
     64     bool isDouble() const { return type() == TypeDouble; }
     65     bool isFilterOperations() const { return type() == TypeFilterOperations; }
     66     bool isImage() const { return type() == TypeImage; }
     67     bool isLength() const { return type() == TypeLength; }
     68     bool isLengthBox() const { return type() == TypeLengthBox; }
     69     bool isLengthBoxAndBool() const { return type() == TypeLengthBoxAndBool; }
     70     bool isLengthPoint() const { return type() == TypeLengthPoint; }
     71     bool isLengthPoint3D() const { return type() == TypeLengthPoint3D; }
     72     bool isLengthSize() const { return type() == TypeLengthSize; }
     73     bool isNeutral() const { return type() == TypeNeutral; }
     74     bool isRepeatable() const { return type() == TypeRepeatable; }
     75     bool isSVGLength() const { return type() == TypeSVGLength; }
     76     bool isSVGPaint() const { return type() == TypeSVGPaint; }
     77     bool isShadow() const { return type() == TypeShadow; }
     78     bool isShapeValue() const { return type() == TypeShapeValue; }
     79     bool isStrokeDasharrayList() const { return type() == TypeStrokeDasharrayList; }
     80     bool isTransform() const { return type() == TypeTransform; }
     81     bool isUnknown() const { return type() == TypeUnknown; }
     82     bool isVisibility() const { return type() == TypeVisibility; }
     83 
     84     bool isSameType(const AnimatableValue* value) const
     85     {
     86         ASSERT(value);
     87         return value->type() == type();
     88     }
     89 
     90     virtual void trace(Visitor*) { }
     91 
     92 protected:
     93     enum AnimatableType {
     94         TypeClipPathOperation,
     95         TypeColor,
     96         TypeDouble,
     97         TypeFilterOperations,
     98         TypeImage,
     99         TypeLength,
    100         TypeLengthBox,
    101         TypeLengthBoxAndBool,
    102         TypeLengthPoint,
    103         TypeLengthPoint3D,
    104         TypeLengthSize,
    105         TypeNeutral,
    106         TypeRepeatable,
    107         TypeSVGLength,
    108         TypeSVGPaint,
    109         TypeShadow,
    110         TypeShapeValue,
    111         TypeStrokeDasharrayList,
    112         TypeTransform,
    113         TypeUnknown,
    114         TypeVisibility,
    115     };
    116 
    117     virtual bool usesDefaultInterpolationWith(const AnimatableValue* value) const { return false; }
    118     virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const = 0;
    119     static PassRefPtrWillBeRawPtr<AnimatableValue> defaultInterpolateTo(const AnimatableValue* left, const AnimatableValue* right, double fraction) { return takeConstRef((fraction < 0.5) ? left : right); }
    120 
    121     template <class T>
    122     static PassRefPtrWillBeRawPtr<T> takeConstRef(const T* value) { return PassRefPtrWillBeRawPtr<T>(const_cast<T*>(value)); }
    123 
    124 private:
    125     virtual AnimatableType type() const = 0;
    126     // Implementations can assume that the object being compared has the same type as the object this is called on
    127     virtual bool equalTo(const AnimatableValue*) const = 0;
    128 
    129     virtual double distanceTo(const AnimatableValue*) const;
    130 
    131     template <class Keyframe> friend class KeyframeEffectModel;
    132 };
    133 
    134 #define DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(thisType, predicate) \
    135     DEFINE_TYPE_CASTS(thisType, AnimatableValue, value, value->predicate, value.predicate)
    136 
    137 } // namespace blink
    138 
    139 #endif // AnimatableValue_h
    140