/*

    Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>

                  2004, 2005, 2006 Rob Buis <buis@kde.org>

    Copyright (C) 2009 Google, Inc.  All rights reserved.

    Copyright (C) Research In Motion Limited 2010. All rights reserved.

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

*/

#include "config.h"

#if ENABLE(SVG)

#include "SVGLocatable.h"

#include "RenderObject.h"

#include "SVGStyledLocatableElement.h"

#include "SVGException.h"

namespace WebCore {

SVGLocatable::SVGLocatable()

{

}

SVGLocatable::~SVGLocatable()

{

}

static bool isViewportElement(Node* node)

{

    return (node->hasTagName(SVGNames::svgTag)

        || node->hasTagName(SVGNames::symbolTag)

#if ENABLE(SVG_FOREIGN_OBJECT)

        || node->hasTagName(SVGNames::foreignObjectTag)

#endif

        || node->hasTagName(SVGNames::imageTag));

}

SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)

{

    ASSERT(element);

    for (Node* n = element->parentNode(); n && !n->isDocumentNode(); n = n->parentNode()) {

        if (isViewportElement(n))

            return static_cast<SVGElement*>(n);

    }

    return 0;

}

SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)

{

    ASSERT(element);

    SVGElement* farthest = 0;

    for (Node* n = element->parentNode(); n && !n->isDocumentNode(); n = n->parentNode()) {

        if (isViewportElement(n))

            farthest = static_cast<SVGElement*>(n);

    }

    return farthest;

}

FloatRect SVGLocatable::getBBox(const SVGElement* element)

{

    ASSERT(element);

    element->document()->updateLayoutIgnorePendingStylesheets();

    // FIXME: Eventually we should support getBBox for detached elements.

    if (!element->renderer())

        return FloatRect();

    return element->renderer()->objectBoundingBox();

}

AffineTransform SVGLocatable::computeCTM(const SVGElement* element, CTMScope mode)

{

    ASSERT(element);

    element->document()->updateLayoutIgnorePendingStylesheets();

    AffineTransform ctm;

    SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : 0;

    Node* current = const_cast<SVGElement*>(element);

    while (current && current->isSVGElement()) {

        SVGElement* currentElement = static_cast<SVGElement*>(current);

        if (currentElement->isStyled())

            ctm = static_cast<SVGStyledElement*>(currentElement)->localCoordinateSpaceTransform(mode).multLeft(ctm);

        // For getCTM() computation, stop at the nearest viewport element

        if (currentElement == stopAtElement)

            break;

        current = current->isShadowNode() ? current->shadowParentNode() : current->parentNode();

    }

    return ctm;

}

AffineTransform SVGLocatable::getTransformToElement(SVGElement* target, ExceptionCode& ec) const

{

    AffineTransform ctm = getCTM();

    if (target && target->isStyledLocatable()) {

        AffineTransform targetCTM = static_cast<SVGStyledLocatableElement*>(target)->getCTM();

        if (!targetCTM.isInvertible()) {

            ec = SVGException::SVG_MATRIX_NOT_INVERTABLE;

            return ctm;

        }

        ctm *= targetCTM.inverse();

    }

    return ctm;

}

}

#endif // ENABLE(SVG)