/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * 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
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef InterpolatedTransformOperation_h
#define InterpolatedTransformOperation_h

#include "platform/transforms/TransformOperation.h"
#include "platform/transforms/TransformOperations.h"

namespace blink {

// This class is an implementation detail for deferred interpolations.
class PLATFORM_EXPORT InterpolatedTransformOperation : public TransformOperation {
public:
    static PassRefPtr<InterpolatedTransformOperation> create(const TransformOperations& from, const TransformOperations& to, double progress)
    {
        return adoptRef(new InterpolatedTransformOperation(from, to, progress));
    }

    virtual bool canBlendWith(const TransformOperation& other) const
    {
        return isSameType(other);
    }

private:
    virtual bool isIdentity() const OVERRIDE { return false; }

    virtual OperationType type() const OVERRIDE { return Interpolated; }

    virtual bool operator==(const TransformOperation&) const OVERRIDE;
    virtual void apply(TransformationMatrix&, const FloatSize& borderBoxSize) const OVERRIDE;

    virtual PassRefPtr<TransformOperation> blend(const TransformOperation* from, double progress, bool blendToIdentity = false) OVERRIDE;

    virtual bool dependsOnBoxSize() const OVERRIDE
    {
        return from.dependsOnBoxSize() || to.dependsOnBoxSize();
    }

    InterpolatedTransformOperation(const TransformOperations& from, const TransformOperations& to, double progress)
        : from(from)
        , to(to)
        , progress(progress)
    { }

    const TransformOperations from;
    const TransformOperations to;
    double progress;
};

} // namespace blink

#endif // InterpolatedTransformOperation_h