/*

    Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>

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

                  2010 Dirk Schulze <krit@webkit.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 "SVGFEImageElement.h"

#include "Attr.h"

#include "CachedImage.h"

#include "DocLoader.h"

#include "Document.h"

#include "RenderObject.h"

#include "RenderSVGResource.h"

#include "SVGLength.h"

#include "SVGNames.h"

#include "SVGPreserveAspectRatio.h"

#include "SVGRenderSupport.h"

namespace WebCore {

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

    : SVGFilterPrimitiveStandardAttributes(tagName, doc)

    , SVGURIReference()

    , SVGLangSpace()

    , SVGExternalResourcesRequired()

{

}

SVGFEImageElement::~SVGFEImageElement()

{

    if (m_cachedImage)

        m_cachedImage->removeClient(this);

}

void SVGFEImageElement::requestImageResource()

{

    if (m_cachedImage) {

        m_cachedImage->removeClient(this);

        m_cachedImage = 0;

    }

    Element* hrefElement = document()->getElementById(SVGURIReference::getTarget(href()));

    if (hrefElement && hrefElement->isSVGElement() && hrefElement->renderer())

        return;

    m_cachedImage = ownerDocument()->docLoader()->requestImage(href());

    if (m_cachedImage)

        m_cachedImage->addClient(this);

}

void SVGFEImageElement::parseMappedAttribute(Attribute* attr)

{

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

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

        SVGPreserveAspectRatio::parsePreserveAspectRatio(this, value);

    else {

        if (SVGURIReference::parseMappedAttribute(attr)) {

            requestImageResource();

            return;

        }

        if (SVGLangSpace::parseMappedAttribute(attr))

            return;

        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))

            return;

        SVGFilterPrimitiveStandardAttributes::parseMappedAttribute(attr);

    }

}

void SVGFEImageElement::synchronizeProperty(const QualifiedName& attrName)

{

    SVGFilterPrimitiveStandardAttributes::synchronizeProperty(attrName);

    if (attrName == anyQName()) {

        synchronizePreserveAspectRatio();

        synchronizeHref();

        synchronizeExternalResourcesRequired();

        return;

    }

    if (attrName == SVGNames::preserveAspectRatioAttr)

        synchronizePreserveAspectRatio();

    else if (SVGURIReference::isKnownAttribute(attrName))

        synchronizeHref();

    else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))

        synchronizeExternalResourcesRequired();

}

void SVGFEImageElement::notifyFinished(CachedResource*)

{

    if (!inDocument())

        return;

    Element* parent = parentElement();

    ASSERT(parent);

    if (!parent->hasTagName(SVGNames::filterTag) || !parent->renderer())

        return;

    RenderSVGResource::markForLayoutAndParentResourceInvalidation(parent->renderer());

}

PassRefPtr<FilterEffect> SVGFEImageElement::build(SVGFilterBuilder*)

{

    if (!m_cachedImage && !m_targetImage) {

        Element* hrefElement = document()->getElementById(SVGURIReference::getTarget(href()));

        if (!hrefElement || !hrefElement->isSVGElement())

            return 0;

        RenderObject* renderer = hrefElement->renderer();

        if (!renderer)

            return 0;

        IntRect targetRect = enclosingIntRect(renderer->objectBoundingBox());

        m_targetImage = ImageBuffer::create(targetRect.size(), LinearRGB);

        SVGRenderSupport::renderSubtreeToImage(m_targetImage.get(), renderer);

    }

    return FEImage::create(m_targetImage ? m_targetImage->image() : m_cachedImage->image(), preserveAspectRatio());

}

void SVGFEImageElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const

{

    SVGFilterPrimitiveStandardAttributes::addSubresourceAttributeURLs(urls);

    addSubresourceURL(urls, document()->completeURL(href()));

}

}

#endif // ENABLE(SVG)