/*
 * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
 * Copyright (C) 2005 Alexander Kellett <lypanov@kde.org>
 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
 * Copyright (C) Research In Motion Limited 2009-2010. 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 "SVGMaskElement.h"

#include "Attribute.h"
#include "CSSStyleSelector.h"
#include "RenderSVGResourceMasker.h"
#include "SVGElementInstance.h"
#include "SVGNames.h"
#include "SVGRenderSupport.h"
#include "SVGUnitTypes.h"

namespace WebCore {

// Animated property definitions
DEFINE_ANIMATED_ENUMERATION(SVGMaskElement, SVGNames::maskUnitsAttr, MaskUnits, maskUnits, SVGUnitTypes::SVGUnitType)
DEFINE_ANIMATED_ENUMERATION(SVGMaskElement, SVGNames::maskContentUnitsAttr, MaskContentUnits, maskContentUnits, SVGUnitTypes::SVGUnitType)
DEFINE_ANIMATED_LENGTH(SVGMaskElement, SVGNames::xAttr, X, x)
DEFINE_ANIMATED_LENGTH(SVGMaskElement, SVGNames::yAttr, Y, y)
DEFINE_ANIMATED_LENGTH(SVGMaskElement, SVGNames::widthAttr, Width, width)
DEFINE_ANIMATED_LENGTH(SVGMaskElement, SVGNames::heightAttr, Height, height)
DEFINE_ANIMATED_BOOLEAN(SVGMaskElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)

BEGIN_REGISTER_ANIMATED_PROPERTIES(SVGMaskElement)
    REGISTER_LOCAL_ANIMATED_PROPERTY(maskUnits)
    REGISTER_LOCAL_ANIMATED_PROPERTY(maskContentUnits)
    REGISTER_LOCAL_ANIMATED_PROPERTY(x)
    REGISTER_LOCAL_ANIMATED_PROPERTY(y)
    REGISTER_LOCAL_ANIMATED_PROPERTY(width)
    REGISTER_LOCAL_ANIMATED_PROPERTY(height)
    REGISTER_LOCAL_ANIMATED_PROPERTY(externalResourcesRequired)
    REGISTER_PARENT_ANIMATED_PROPERTIES(SVGStyledLocatableElement)
    REGISTER_PARENT_ANIMATED_PROPERTIES(SVGTests)
END_REGISTER_ANIMATED_PROPERTIES

inline SVGMaskElement::SVGMaskElement(const QualifiedName& tagName, Document* document)
    : SVGStyledLocatableElement(tagName, document)
    , m_maskUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
    , m_maskContentUnits(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
    , m_x(LengthModeWidth, "-10%")
    , m_y(LengthModeHeight, "-10%")
    , m_width(LengthModeWidth, "120%")
    , m_height(LengthModeHeight, "120%")
{
    // Spec: If the x/y attribute is not specified, the effect is as if a value of "-10%" were specified.
    // Spec: If the width/height attribute is not specified, the effect is as if a value of "120%" were specified.
    ASSERT(hasTagName(SVGNames::maskTag));
    registerAnimatedPropertiesForSVGMaskElement();
}

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

bool SVGMaskElement::isSupportedAttribute(const QualifiedName& attrName)
{
    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
    if (supportedAttributes.isEmpty()) {
        SVGTests::addSupportedAttributes(supportedAttributes);
        SVGLangSpace::addSupportedAttributes(supportedAttributes);
        SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
        supportedAttributes.add(SVGNames::maskUnitsAttr);
        supportedAttributes.add(SVGNames::maskContentUnitsAttr);
        supportedAttributes.add(SVGNames::xAttr);
        supportedAttributes.add(SVGNames::yAttr);
        supportedAttributes.add(SVGNames::widthAttr);
        supportedAttributes.add(SVGNames::heightAttr);
    }
    return supportedAttributes.contains(attrName);
}

void SVGMaskElement::parseMappedAttribute(Attribute* attr)
{
    if (!isSupportedAttribute(attr->name())) {
        SVGStyledElement::parseMappedAttribute(attr);
        return;
    }

    if (attr->name() == SVGNames::maskUnitsAttr) {
        SVGUnitTypes::SVGUnitType propertyValue = SVGPropertyTraits<SVGUnitTypes::SVGUnitType>::fromString(attr->value());
        if (propertyValue > 0)
            setMaskUnitsBaseValue(propertyValue);
        return;
    }

    if (attr->name() == SVGNames::maskContentUnitsAttr) {
        SVGUnitTypes::SVGUnitType propertyValue = SVGPropertyTraits<SVGUnitTypes::SVGUnitType>::fromString(attr->value());
        if (propertyValue > 0)
            setMaskContentUnitsBaseValue(propertyValue);
        return;
    }

    if (attr->name() == SVGNames::xAttr) {
        setXBaseValue(SVGLength(LengthModeWidth, attr->value()));
        return;
    }

    if (attr->name() == SVGNames::yAttr) {
        setYBaseValue(SVGLength(LengthModeHeight, attr->value()));
        return;
    }

    if (attr->name() == SVGNames::widthAttr) {
        setWidthBaseValue(SVGLength(LengthModeWidth, attr->value()));
        return;
    }

    if (attr->name() == SVGNames::heightAttr) {
        setHeightBaseValue(SVGLength(LengthModeHeight, attr->value()));
        return;
    }

    if (SVGTests::parseMappedAttribute(attr))
        return;
    if (SVGLangSpace::parseMappedAttribute(attr))
        return;
    if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
        return;

    ASSERT_NOT_REACHED();
}

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

    SVGElementInstance::InvalidationGuard invalidationGuard(this);
    
    if (attrName == SVGNames::xAttr
        || attrName == SVGNames::yAttr
        || attrName == SVGNames::widthAttr
        || attrName == SVGNames::heightAttr)
        updateRelativeLengthsInformation();

    if (RenderObject* object = renderer())
        object->setNeedsLayout(true);
}

void SVGMaskElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
{
    SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);

    if (changedByParser)
        return;

    if (RenderObject* object = renderer())
        object->setNeedsLayout(true);
}

FloatRect SVGMaskElement::maskBoundingBox(const FloatRect& objectBoundingBox) const
{
    FloatRect maskBBox;
    if (maskUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
        maskBBox = FloatRect(x().valueAsPercentage() * objectBoundingBox.width() + objectBoundingBox.x(),
                             y().valueAsPercentage() * objectBoundingBox.height() + objectBoundingBox.y(),
                             width().valueAsPercentage() * objectBoundingBox.width(),
                             height().valueAsPercentage() * objectBoundingBox.height());
    else
        maskBBox = FloatRect(x().value(this),
                             y().value(this),
                             width().value(this),
                             height().value(this));

    return maskBBox;
}

RenderObject* SVGMaskElement::createRenderer(RenderArena* arena, RenderStyle*)
{
    return new (arena) RenderSVGResourceMasker(this);
}

bool SVGMaskElement::selfHasRelativeLengths() const
{
    return x().isRelative()
        || y().isRelative()
        || width().isRelative()
        || height().isRelative();
}

}

#endif // ENABLE(SVG)
