[wip] interpolable value refactor. NOT FOR LANDING.

Source/core/animation/AnimatableValue.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AnimatableValue_h
 #define AnimatableValue_h
 
+#include "core/animation/AnimationEffect.h"
 #include "core/css/CSSValue.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class AnimatableValue : public RefCounted<AnimatableValue> {
+class AnimatableValue : public AnimationEffect::CompositableValue {
 public:
     virtual ~AnimatableValue() { }
 
     static const AnimatableValue* neutralValue();
 
     static PassRefPtr<AnimatableValue> interpolate(const AnimatableValue*, const AnimatableValue*, double fraction);
     // For noncommutative values read add(A, B) to mean the value A with B composed onto it.
     static PassRefPtr<AnimatableValue> add(const AnimatableValue*, const AnimatableValue*);
     static bool usesDefaultInterpolation(const AnimatableValue* from, const AnimatableValue* to)
     {
         return !from->isSameType(to) || from->usesDefaultInterpolationWith(to);
     }
 
     bool equals(const AnimatableValue* value) const
     {
         return isSameType(value) && equalTo(value);
     }
     bool equals(const AnimatableValue& value) const
     {
         return equals(&value);
     }
 
+    virtual bool dependsOnUnderlyingValue() const OVERRIDE FINAL { return false; }
+    virtual PassRefPtr<AnimatableValue> compositeOnto(const AnimatableValue*) const OVERRIDE FINAL { return takeConstRef(this); }
+    virtual bool isAnimatableValue() const { return true; }
+
     bool isClipPathOperation() const { return type() == TypeClipPathOperation; }
     bool isColor() const { return type() == TypeColor; }
     bool isDouble() const { return type() == TypeDouble; }
     bool isFilterOperations() const { return type() == TypeFilterOperations; }
     bool isImage() const { return type() == TypeImage; }
     bool isLength() const { return type() == TypeLength; }
     bool isLengthBox() const { return type() == TypeLengthBox; }
     bool isLengthBoxAndBool() const { return type() == TypeLengthBoxAndBool; }
     bool isLengthPoint() const { return type() == TypeLengthPoint; }
     bool isLengthSize() const { return type() == TypeLengthSize; }
@@ skipping 48 matching lines @@
 
 
 
     template <class T>
     static PassRefPtr<T> takeConstRef(const T* value) { return PassRefPtr<T>(const_cast<T*>(value)); }
 
 private:
     virtual AnimatableType type() const = 0;
     // Implementations can assume that the object being compared has the same type as the object this is called on
     virtual bool equalTo(const AnimatableValue*) const = 0;
+
+    friend class KeyframeEffectModel;
 };
 
 #define DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AnimatableValue, value, value->predicate, value.predicate)
 
+DEFINE_TYPE_CASTS(AnimatableValue, AnimationEffect::CompositableValue, value, value->isAnimatableValue(), value.isAnimatableValue());
+
 } // namespace WebCore
 
 #endif // AnimatableValue_h