Source/platform/transforms/PerspectiveTransformOperation.h

/*
 * Copyright (C) 2009 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 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 PerspectiveTransformOperation_h
#define PerspectiveTransformOperation_h

#include "platform/transforms/TransformOperation.h"

namespace blink {

class PLATFORM_EXPORT PerspectiveTransformOperation : public TransformOperation {
public:
    static PassRefPtr<PerspectiveTransformOperation> create(double p)
    {
        return adoptRef(new PerspectiveTransformOperation(p));
    }

    double perspective() const { return m_p; }

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

private:
    virtual bool isIdentity() const OVERRIDE { return !m_p; }
    virtual OperationType type() const OVERRIDE { return Perspective; }

    virtual bool operator==(const TransformOperation& o) const OVERRIDE
    {
        if (!isSameType(o))
            return false;
        const PerspectiveTransformOperation* p = static_cast<const PerspectiveTransformOperation*>(&o);
        return m_p == p->m_p;
    }

    virtual void apply(TransformationMatrix& transform, const FloatSize&) const OVERRIDE
    {
        transform.applyPerspective(m_p);
    }

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

    PerspectiveTransformOperation(double p)
        : m_p(p)
    {
    }

    double m_p;
};

} // namespace blink

#endif // PerspectiveTransformOperation_h