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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#ifndef SKY_ENGINE_PLATFORM_TRANSFORMS_INTERPOLATEDTRANSFORMOPERATION_H_
#define SKY_ENGINE_PLATFORM_TRANSFORMS_INTERPOLATEDTRANSFORMOPERATION_H_

#include "sky/engine/platform/transforms/TransformOperation.h"
#include "sky/engine/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  // SKY_ENGINE_PLATFORM_TRANSFORMS_INTERPOLATEDTRANSFORMOPERATION_H_