/*

 * 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. 

 */

#include "config.h"

#include "TransformState.h"

namespace WebCore {

void TransformState::move(int x, int y, TransformAccumulation accumulate)

{

    if (m_accumulatingTransform && m_accumulatedTransform) {

        // If we're accumulating into an existing transform, apply the translation.

        if (m_direction == ApplyTransformDirection)

            m_accumulatedTransform->translateRight(x, y);

        else

            m_accumulatedTransform->translate(-x, -y);  // We're unapplying, so negate

        // Then flatten if necessary.

        if (accumulate == FlattenTransform)

            flatten();

    } else {

        // Just move the point and, optionally, the quad.

        m_lastPlanarPoint.move(x, y);

        if (m_mapQuad)

            m_lastPlanarQuad.move(x, y);

    }

    m_accumulatingTransform = accumulate == AccumulateTransform;

}

// FIXME: We transform AffineTransform to TransformationMatrix. This is rather inefficient.

void TransformState::applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation accumulate)

{

    applyTransform(transformFromContainer.toTransformationMatrix(), accumulate);

}

void TransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate)

{

    // If we have an accumulated transform from last time, multiply in this transform

    if (m_accumulatedTransform) {

        if (m_direction == ApplyTransformDirection)

            m_accumulatedTransform->multiply(transformFromContainer);

        else

            m_accumulatedTransform->multLeft(transformFromContainer);

    } else if (accumulate == AccumulateTransform) {

        // Make one if we started to accumulate

        m_accumulatedTransform.set(new TransformationMatrix(transformFromContainer));

    }

    if (accumulate == FlattenTransform) {

        const TransformationMatrix* finalTransform = m_accumulatedTransform ? m_accumulatedTransform.get() : &transformFromContainer;

        flattenWithTransform(*finalTransform);

    }

    m_accumulatingTransform = accumulate == AccumulateTransform;

}

void TransformState::flatten()

{

    if (!m_accumulatedTransform) {

        m_accumulatingTransform = false;

        return;

    }

    flattenWithTransform(*m_accumulatedTransform);

}

FloatPoint TransformState::mappedPoint() const

{

    if (!m_accumulatedTransform)

        return m_lastPlanarPoint;

    if (m_direction == ApplyTransformDirection)

        return m_accumulatedTransform->mapPoint(m_lastPlanarPoint);

    return m_accumulatedTransform->inverse().projectPoint(m_lastPlanarPoint);

}

FloatQuad TransformState::mappedQuad() const

{

    if (!m_accumulatedTransform)

        return m_lastPlanarQuad;

    if (m_direction == ApplyTransformDirection)

        return m_accumulatedTransform->mapQuad(m_lastPlanarQuad);

    return m_accumulatedTransform->inverse().projectQuad(m_lastPlanarQuad);

}

void TransformState::flattenWithTransform(const TransformationMatrix& t)

{

    if (m_direction == ApplyTransformDirection) {

        m_lastPlanarPoint = t.mapPoint(m_lastPlanarPoint);

        if (m_mapQuad)

            m_lastPlanarQuad = t.mapQuad(m_lastPlanarQuad);

    } else {

        TransformationMatrix inverseTransform = t.inverse();

        m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint);

        if (m_mapQuad)

            m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad);

    }

    // We could throw away m_accumulatedTransform if we wanted to here, but that

    // would cause thrash when traversing hierarchies with alternating

    // preserve-3d and flat elements.

    if (m_accumulatedTransform)

        m_accumulatedTransform->makeIdentity();

    m_accumulatingTransform = false;

}

// HitTestingTransformState methods

void HitTestingTransformState::translate(int x, int y, TransformAccumulation accumulate)

{

    m_accumulatedTransform.translate(x, y);    

    if (accumulate == FlattenTransform)

        flattenWithTransform(m_accumulatedTransform);

    m_accumulatingTransform = accumulate == AccumulateTransform;

}

void HitTestingTransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate)

{

    m_accumulatedTransform.multLeft(transformFromContainer);    

    if (accumulate == FlattenTransform)

        flattenWithTransform(m_accumulatedTransform);

    m_accumulatingTransform = accumulate == AccumulateTransform;

}

void HitTestingTransformState::flatten()

{

    flattenWithTransform(m_accumulatedTransform);

}

void HitTestingTransformState::flattenWithTransform(const TransformationMatrix& t)

{

    TransformationMatrix inverseTransform = t.inverse();

    m_lastPlanarPoint = inverseTransform.projectPoint(m_lastPlanarPoint);

    m_lastPlanarQuad = inverseTransform.projectQuad(m_lastPlanarQuad);

    m_accumulatedTransform.makeIdentity();

    m_accumulatingTransform = false;

}

FloatPoint HitTestingTransformState::mappedPoint() const

{

    return m_accumulatedTransform.inverse().projectPoint(m_lastPlanarPoint);

}

FloatQuad HitTestingTransformState::mappedQuad() const

{

    return m_accumulatedTransform.inverse().projectQuad(m_lastPlanarQuad);

}

} // namespace WebCore