/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * 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
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#ifndef AnimationEffect_h
#define AnimationEffect_h

#include "CSSPropertyNames.h"
#include "wtf/HashMap.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefCounted.h"

namespace WebCore {

class AnimatableValue;

class AnimationEffect : public RefCounted<AnimationEffect> {
public:
    enum CompositeOperation {
        CompositeReplace,
        CompositeAdd,
    };
    // Encapsulates the value which results from applying a set of composition operations onto an
    // underlying value. It is used to represent the output of the effect phase of the Web
    // Animations model.
    class CompositableValue : public RefCounted<CompositableValue> {
    public:
        virtual ~CompositableValue() { }
        virtual PassRefPtr<AnimatableValue> compositeOnto(const AnimatableValue*) const = 0;
    };

    virtual ~AnimationEffect() { }
    typedef HashMap<CSSPropertyID, RefPtr<CompositableValue> > CompositableValueMap;
    virtual PassOwnPtr<CompositableValueMap> sample(int iteration, double fraction) const = 0;
};

} // namespace WebCore

#endif // AnimationEffect_h