/*
 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
 *
 * 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 "SVGFEColorMatrixElement.h"

#include "Attribute.h"
#include "FilterEffect.h"
#include "SVGElementInstance.h"
#include "SVGFilterBuilder.h"
#include "SVGNames.h"

namespace WebCore {

// Animated property definitions
DEFINE_ANIMATED_STRING(SVGFEColorMatrixElement, SVGNames::inAttr, In1, in1)
DEFINE_ANIMATED_ENUMERATION(SVGFEColorMatrixElement, SVGNames::typeAttr, Type, type, ColorMatrixType)
DEFINE_ANIMATED_NUMBER_LIST(SVGFEColorMatrixElement, SVGNames::valuesAttr, Values, values)

BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGFEColorMatrixElement)
    REGISTER_LOCAL_ANIMATED_PROPERTY(in1)
    REGISTER_LOCAL_ANIMATED_PROPERTY(type)
    REGISTER_LOCAL_ANIMATED_PROPERTY(values)
    REGISTER_PARENT_ANIMATED_PROPERTIES(SVGFilterPrimitiveStandardAttributes)
END_REGISTER_ANIMATED_PROPERTIES

inline SVGFEColorMatrixElement::SVGFEColorMatrixElement(const QualifiedName& tagName, Document& document)
    : SVGFilterPrimitiveStandardAttributes(tagName, document)
    , m_type(FECOLORMATRIX_TYPE_MATRIX)
{
    ASSERT(hasTagName(SVGNames::feColorMatrixTag));
    registerAnimatedPropertiesForSVGFEColorMatrixElement();
}

PassRefPtr<SVGFEColorMatrixElement> SVGFEColorMatrixElement::create(const QualifiedName& tagName, Document& document)
{
    return adoptRef(new SVGFEColorMatrixElement(tagName, document));
}

bool SVGFEColorMatrixElement::isSupportedAttribute(const QualifiedName& attrName)
{
    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
    if (supportedAttributes.isEmpty()) {
        supportedAttributes.add(SVGNames::typeAttr);
        supportedAttributes.add(SVGNames::valuesAttr);
        supportedAttributes.add(SVGNames::inAttr);
    }
    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
}

void SVGFEColorMatrixElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    if (!isSupportedAttribute(name)) {
        SVGFilterPrimitiveStandardAttributes::parseAttribute(name, value);
        return;
    }

    if (name == SVGNames::typeAttr) {
        ColorMatrixType propertyValue = SVGPropertyTraits<ColorMatrixType>::fromString(value);
        if (propertyValue > 0)
            setTypeBaseValue(propertyValue);
        return;
    }

    if (name == SVGNames::inAttr) {
        setIn1BaseValue(value);
        return;
    }

    if (name == SVGNames::valuesAttr) {
        SVGNumberList newList;
        newList.parse(value);
        detachAnimatedValuesListWrappers(newList.size());
        setValuesBaseValue(newList);
        return;
    }

    ASSERT_NOT_REACHED();
}

bool SVGFEColorMatrixElement::setFilterEffectAttribute(FilterEffect* effect, const QualifiedName& attrName)
{
    FEColorMatrix* colorMatrix = static_cast<FEColorMatrix*>(effect);
    if (attrName == SVGNames::typeAttr)
        return colorMatrix->setType(type());
    if (attrName == SVGNames::valuesAttr)
        return colorMatrix->setValues(values());

    ASSERT_NOT_REACHED();
    return false;
}

void SVGFEColorMatrixElement::svgAttributeChanged(const QualifiedName& attrName)
{
    if (!isSupportedAttribute(attrName)) {
        SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
        return;
    }

    SVGElementInstance::InvalidationGuard invalidationGuard(this);

    if (attrName == SVGNames::typeAttr || attrName == SVGNames::valuesAttr) {
        primitiveAttributeChanged(attrName);
        return;
    }

    if (attrName == SVGNames::inAttr) {
        invalidate();
        return;
    }

    ASSERT_NOT_REACHED();
}

PassRefPtr<FilterEffect> SVGFEColorMatrixElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
{
    FilterEffect* input1 = filterBuilder->getEffectById(in1());

    if (!input1)
        return 0;

    Vector<float> filterValues;
    ColorMatrixType filterType = type();

    // Use defaults if values is empty (SVG 1.1 15.10).
    if (!hasAttribute(SVGNames::valuesAttr)) {
        switch (filterType) {
        case FECOLORMATRIX_TYPE_MATRIX:
            for (size_t i = 0; i < 20; i++)
                filterValues.append((i % 6) ? 0 : 1);
            break;
        case FECOLORMATRIX_TYPE_HUEROTATE:
            filterValues.append(0);
            break;
        case FECOLORMATRIX_TYPE_SATURATE:
            filterValues.append(1);
            break;
        default:
            break;
        }
    } else {
        filterValues = values();
        unsigned size = filterValues.size();

        if ((filterType == FECOLORMATRIX_TYPE_MATRIX && size != 20)
            || (filterType == FECOLORMATRIX_TYPE_HUEROTATE && size != 1)
            || (filterType == FECOLORMATRIX_TYPE_SATURATE && size != 1))
            return 0;
    }

    RefPtr<FilterEffect> effect = FEColorMatrix::create(filter, filterType, filterValues);
    effect->inputEffects().append(input1);
    return effect.release();
}

} // namespace WebCore

#endif // ENABLE(SVG)
