/*

    Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>

                  2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>

    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 "SVGGradientElement.h"

#include "Attribute.h"

#include "CSSStyleSelector.h"

#include "RenderPath.h"

#include "RenderSVGHiddenContainer.h"

#include "RenderSVGResourceLinearGradient.h"

#include "RenderSVGResourceRadialGradient.h"

#include "SVGNames.h"

#include "SVGStopElement.h"

#include "SVGTransformList.h"

#include "SVGTransformable.h"

#include "SVGUnitTypes.h"

namespace WebCore {

SVGGradientElement::SVGGradientElement(const QualifiedName& tagName, Document* doc)

    : SVGStyledElement(tagName, doc)

    , SVGURIReference()

    , SVGExternalResourcesRequired()

    , m_gradientUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)

    , m_gradientTransform(SVGTransformList::create(SVGNames::gradientTransformAttr))

{

}

SVGGradientElement::~SVGGradientElement()

{

}

void SVGGradientElement::parseMappedAttribute(Attribute* attr)

{

    if (attr->name() == SVGNames::gradientUnitsAttr) {

        if (attr->value() == "userSpaceOnUse")

            setGradientUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);

        else if (attr->value() == "objectBoundingBox")

            setGradientUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);

    } else if (attr->name() == SVGNames::gradientTransformAttr) {

        SVGTransformList* gradientTransforms = gradientTransformBaseValue();

        if (!SVGTransformable::parseTransformAttribute(gradientTransforms, attr->value())) {

            ExceptionCode ec = 0;

            gradientTransforms->clear(ec);

        }

    } else if (attr->name() == SVGNames::spreadMethodAttr) {

        if (attr->value() == "reflect")

            setSpreadMethodBaseValue(SpreadMethodReflect);

        else if (attr->value() == "repeat")

            setSpreadMethodBaseValue(SpreadMethodRepeat);

        else if (attr->value() == "pad")

            setSpreadMethodBaseValue(SpreadMethodPad);

    } else {

        if (SVGURIReference::parseMappedAttribute(attr))

            return;

        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))

            return;

        SVGStyledElement::parseMappedAttribute(attr);

    }

}

void SVGGradientElement::svgAttributeChanged(const QualifiedName& attrName)

{

    SVGStyledElement::svgAttributeChanged(attrName);

    if (attrName == SVGNames::gradientUnitsAttr

        || attrName == SVGNames::gradientTransformAttr

        || attrName == SVGNames::spreadMethodAttr

        || SVGURIReference::isKnownAttribute(attrName)

        || SVGExternalResourcesRequired::isKnownAttribute(attrName)

        || SVGStyledElement::isKnownAttribute(attrName))

        invalidateResourceClients();

}

void SVGGradientElement::synchronizeProperty(const QualifiedName& attrName)

{

    SVGStyledElement::synchronizeProperty(attrName);

    if (attrName == anyQName()) {

        synchronizeGradientUnits();

        synchronizeGradientTransform();

        synchronizeSpreadMethod();

        synchronizeExternalResourcesRequired();

        synchronizeHref();

        return;

    }

    if (attrName == SVGNames::gradientUnitsAttr)

        synchronizeGradientUnits();

    else if (attrName == SVGNames::gradientTransformAttr)

        synchronizeGradientTransform();

    else if (attrName == SVGNames::spreadMethodAttr)

        synchronizeSpreadMethod();

    else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))

        synchronizeExternalResourcesRequired();

    else if (SVGURIReference::isKnownAttribute(attrName))

        synchronizeHref();

}

void SVGGradientElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)

{

    SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);

    if (!changedByParser)

        invalidateResourceClients();

}

Vector<Gradient::ColorStop> SVGGradientElement::buildStops()

{

    Vector<Gradient::ColorStop> stops;

    float previousOffset = 0.0f;

    for (Node* n = firstChild(); n; n = n->nextSibling()) {

        SVGElement* element = n->isSVGElement() ? static_cast<SVGElement*>(n) : 0;

        if (!element || !element->isGradientStop())

            continue;

        SVGStopElement* stop = static_cast<SVGStopElement*>(element);

        Color color = stop->stopColorIncludingOpacity();

        // Figure out right monotonic offset

        float offset = stop->offset();

        offset = std::min(std::max(previousOffset, offset), 1.0f);

        previousOffset = offset;

        // Extract individual channel values

        // FIXME: Why doesn't ColorStop take a Color and an offset??

        float r, g, b, a;

        color.getRGBA(r, g, b, a);

        stops.append(Gradient::ColorStop(offset, r, g, b, a));

    }

    return stops;

}

}

#endif // ENABLE(SVG)