/*
    Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
                  2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>

    This file is part of the KDE project

    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 "wtf/Platform.h"

#if ENABLE(SVG)
#include "SVGClipPathElement.h"

#include "css/cssstyleselector.h"
#include "Document.h"
#include "SVGNames.h"
#include "SVGTransformList.h"
#include "SVGUnitTypes.h"

namespace WebCore
{

SVGClipPathElement::SVGClipPathElement(const QualifiedName &tagName, Document *doc)
    : SVGStyledTransformableElement(tagName, doc)
    , SVGTests()
    , SVGLangSpace()
    , SVGExternalResourcesRequired()
    , m_clipPathUnits(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
{
}

SVGClipPathElement::~SVGClipPathElement()
{
}

ANIMATED_PROPERTY_DEFINITIONS(SVGClipPathElement, int, Enumeration, enumeration, ClipPathUnits, clipPathUnits, SVGNames::clipPathUnitsAttr, m_clipPathUnits)

void SVGClipPathElement::parseMappedAttribute(MappedAttribute *attr)
{
    if (attr->name() == SVGNames::clipPathUnitsAttr) {
        if (attr->value() == "userSpaceOnUse") {
            setClipPathUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
        } else if (attr->value() == "objectBoundingBox") {
            setClipPathUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
        }
    } else {
        if (SVGTests::parseMappedAttribute(attr)) {
            return;
        }
        if (SVGLangSpace::parseMappedAttribute(attr)) {
            return;
        }
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr)) {
            return;
        }
        SVGStyledTransformableElement::parseMappedAttribute(attr);
    }
}

void SVGClipPathElement::svgAttributeChanged(const QualifiedName &attrName)
{
    SVGStyledTransformableElement::svgAttributeChanged(attrName);

    if (!m_clipper) {
        return;
    }

    if (attrName == SVGNames::clipPathUnitsAttr ||
            SVGTests::isKnownAttribute(attrName) ||
            SVGLangSpace::isKnownAttribute(attrName) ||
            SVGExternalResourcesRequired::isKnownAttribute(attrName) ||
            SVGStyledTransformableElement::isKnownAttribute(attrName)) {
        m_clipper->invalidate();
    }
}

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

    if (!m_clipper) {
        return;
    }

    m_clipper->invalidate();
}

SVGResource *SVGClipPathElement::canvasResource()
{
    if (!m_clipper) {
        m_clipper = SVGResourceClipper::create();
    } else {
        m_clipper->resetClipData();
    }

    bool bbox = clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;

    //RenderStyle* clipPathStyle = styleForRenderer(parent()->renderer()); // FIXME: Manual style resolution is a hack
    for (Node *n = firstChild(); n; n = n->nextSibling()) {
        if (n->isSVGElement() && static_cast<SVGElement *>(n)->isStyledTransformable()) {
            SVGStyledTransformableElement *styled = static_cast<SVGStyledTransformableElement *>(n);
            RenderStyle *pathStyle = document()->styleSelector()->styleForElement(styled/*khtml, clipPathStyle*/);
            if (pathStyle->display() != NONE) {
                Path pathData = styled->toClipPath();
                // FIXME: How do we know the element has done a layout?
                pathData.transform(styled->animatedLocalTransform());
                if (!pathData.isEmpty()) {
                    m_clipper->addClipData(pathData, pathStyle->svgStyle()->clipRule(), bbox);
                }
            }
            //khtml pathStyle->deref(document()->renderArena());
        }
    }
    if (m_clipper->clipData().isEmpty()) {
        Path pathData;
        pathData.addRect(FloatRect());
        m_clipper->addClipData(pathData, RULE_EVENODD, bbox);
    }
    //khtml clipPathStyle->deref(document()->renderArena());
    return m_clipper.get();
}

}

#endif // ENABLE(SVG)
