/*

 * 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 COMPUTER, 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 TransformState_h

#define TransformState_h

#include "AffineTransform.h"

#include "FloatPoint.h"

#include "FloatQuad.h"

#include "IntSize.h"

#include "TransformationMatrix.h"

#include <wtf/Noncopyable.h>

#include <wtf/PassRefPtr.h>

#include <wtf/OwnPtr.h>

#include <wtf/RefCounted.h>

namespace WebCore {

class TransformState : public Noncopyable {

public:

    enum TransformDirection { ApplyTransformDirection, UnapplyInverseTransformDirection };

    enum TransformAccumulation { FlattenTransform, AccumulateTransform };

    // If quad is non-null, it will be mapped

    TransformState(TransformDirection mappingDirection, const FloatPoint& p, const FloatQuad* quad = 0)

        : m_lastPlanarPoint(p)

        , m_accumulatingTransform(false)

        , m_mapQuad(quad != 0)

        , m_direction(mappingDirection)

    {

        if (quad)

            m_lastPlanarQuad = *quad;

    }

    void move(const IntSize& s, TransformAccumulation accumulate = FlattenTransform)

    {

        move(s.width(), s.height(), accumulate);

    }

    void move(int x, int y, TransformAccumulation = FlattenTransform);

    void applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation = FlattenTransform);

    void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation = FlattenTransform);

    void flatten();

    // Return the coords of the point or quad in the last flattened layer

    FloatPoint lastPlanarPoint() const { return m_lastPlanarPoint; }

    FloatQuad lastPlanarQuad() const { return m_lastPlanarQuad; }

    // Return the point or quad mapped through the current transform

    FloatPoint mappedPoint() const;

    FloatQuad mappedQuad() const;

private:

    void flattenWithTransform(const TransformationMatrix&);

    FloatPoint m_lastPlanarPoint;

    FloatQuad m_lastPlanarQuad;

    // We only allocate the transform if we need to

    OwnPtr<TransformationMatrix> m_accumulatedTransform;

    bool m_accumulatingTransform;

    bool m_mapQuad;

    TransformDirection m_direction;

};

class HitTestingTransformState : public RefCounted<HitTestingTransformState> {

public:

    static PassRefPtr<HitTestingTransformState> create(const FloatPoint& p, const FloatQuad& quad)

    {

        return adoptRef(new HitTestingTransformState(p, quad));

    }

    static PassRefPtr<HitTestingTransformState> create(const HitTestingTransformState& other)

    {

        return adoptRef(new HitTestingTransformState(other));

    }

    enum TransformAccumulation { FlattenTransform, AccumulateTransform };

    void translate(int x, int y, TransformAccumulation);

    void applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation);

    FloatPoint mappedPoint() const;

    FloatQuad mappedQuad() const;

    void flatten();

    FloatPoint m_lastPlanarPoint;

    FloatQuad m_lastPlanarQuad;

    TransformationMatrix m_accumulatedTransform;

    bool m_accumulatingTransform;

private:

    HitTestingTransformState(const FloatPoint& p, const FloatQuad& quad)

        : m_lastPlanarPoint(p)

        , m_lastPlanarQuad(quad)

        , m_accumulatingTransform(false)

    {

    }

    HitTestingTransformState(const HitTestingTransformState& other)

        : RefCounted<HitTestingTransformState>()

        , m_lastPlanarPoint(other.m_lastPlanarPoint)

        , m_lastPlanarQuad(other.m_lastPlanarQuad)

        , m_accumulatedTransform(other.m_accumulatedTransform)

        , m_accumulatingTransform(other.m_accumulatingTransform)

    {

    }

    void flattenWithTransform(const TransformationMatrix&);

};

} // namespace WebCore

#endif // TransformState_h