/*

     Copyright (C) 2005 Oliver Hunt <ojh16@student.canterbury.ac.nz>

     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) && ENABLE(FILTERS)

#include "SVGFEDiffuseLightingElement.h"

#include "Attr.h"

#include "RenderObject.h"

#include "SVGColor.h"

#include "SVGFEDiffuseLighting.h"

#include "SVGFELightElement.h"

#include "SVGNames.h"

#include "SVGParserUtilities.h"

#include "SVGRenderStyle.h"

namespace WebCore {

char SVGKernelUnitLengthXIdentifier[] = "SVGKernelUnitLengthX";

char SVGKernelUnitLengthYIdentifier[] = "SVGKernelUnitLengthY";

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

    : SVGFilterPrimitiveStandardAttributes(tagName, doc)

    , m_diffuseConstant(1.0f)

    , m_surfaceScale(1.0f)

{

}

SVGFEDiffuseLightingElement::~SVGFEDiffuseLightingElement()

{

}

void SVGFEDiffuseLightingElement::parseMappedAttribute(Attribute* attr)

{

    const String& value = attr->value();

    if (attr->name() == SVGNames::inAttr)

        setIn1BaseValue(value);

    else if (attr->name() == SVGNames::surfaceScaleAttr)

        setSurfaceScaleBaseValue(value.toFloat());

    else if (attr->name() == SVGNames::diffuseConstantAttr)

        setDiffuseConstantBaseValue(value.toFloat());

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

        float x, y;

        if (parseNumberOptionalNumber(value, x, y)) {

            setKernelUnitLengthXBaseValue(x);

            setKernelUnitLengthYBaseValue(y);

        }

    } else

        SVGFilterPrimitiveStandardAttributes::parseMappedAttribute(attr);

}

void SVGFEDiffuseLightingElement::synchronizeProperty(const QualifiedName& attrName)

{

    SVGFilterPrimitiveStandardAttributes::synchronizeProperty(attrName);

    if (attrName == anyQName()) {

        synchronizeIn1();

        synchronizeSurfaceScale();

        synchronizeDiffuseConstant();

        synchronizeKernelUnitLengthX();

        synchronizeKernelUnitLengthY();

        return;

    }

    if (attrName == SVGNames::inAttr)

        synchronizeIn1();

    else if (attrName == SVGNames::surfaceScaleAttr)

        synchronizeSurfaceScale();

    else if (attrName == SVGNames::diffuseConstantAttr)

        synchronizeDiffuseConstant();

    else if (attrName == SVGNames::kernelUnitLengthAttr) {

        synchronizeKernelUnitLengthX();

        synchronizeKernelUnitLengthY();

    }

}

PassRefPtr<FilterEffect> SVGFEDiffuseLightingElement::build(SVGFilterBuilder* filterBuilder)

{

    FilterEffect* input1 = filterBuilder->getEffectById(in1());

    if (!input1)

        return 0;

    RefPtr<RenderStyle> filterStyle = styleForRenderer();

    Color color = filterStyle->svgStyle()->lightingColor();

    return FEDiffuseLighting::create(input1, color, surfaceScale(), diffuseConstant(), 

                                            kernelUnitLengthX(), kernelUnitLengthY(), findLights());

}

PassRefPtr<LightSource> SVGFEDiffuseLightingElement::findLights() const

{

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

        if (n->hasTagName(SVGNames::feDistantLightTag) ||

            n->hasTagName(SVGNames::fePointLightTag) ||

            n->hasTagName(SVGNames::feSpotLightTag)) {

            SVGFELightElement* lightNode = static_cast<SVGFELightElement*>(n); 

            return lightNode->lightSource();

        }

    }

    return 0;

}

}

#endif // ENABLE(SVG)