/*

   Copyright (C) 2007 Eric Seidel <eric@webkit.org>

   Copyright (C) 2009 Apple Inc. 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_FONTS)

#include "SVGFontFaceUriElement.h"

#include "Attribute.h"

#include "CSSFontFaceSrcValue.h"

#include "CachedFont.h"

#include "DocLoader.h"

#include "Document.h"

#include "SVGFontFaceElement.h"

#include "SVGNames.h"

#include "XLinkNames.h"

namespace WebCore {

using namespace SVGNames;

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

    : SVGElement(tagName, doc)

{

}

SVGFontFaceUriElement::~SVGFontFaceUriElement()

{

    if (m_cachedFont)

        m_cachedFont->removeClient(this);

}

PassRefPtr<CSSFontFaceSrcValue> SVGFontFaceUriElement::srcValue() const

{

    RefPtr<CSSFontFaceSrcValue> src = CSSFontFaceSrcValue::create(getAttribute(XLinkNames::hrefAttr));

    AtomicString value(getAttribute(formatAttr));

    src->setFormat(value.isEmpty() ? "svg" : value); // Default format

    return src.release();

}

void SVGFontFaceUriElement::parseMappedAttribute(Attribute* attr)

{

    const QualifiedName& attrName = attr->name();

    if (attrName == XLinkNames::hrefAttr)

        loadFont();

    else

        SVGElement::parseMappedAttribute(attr);

}

void SVGFontFaceUriElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)

{

    SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);

    if (!parentNode() || !parentNode()->hasTagName(font_face_srcTag))

        return;

    Node* grandParent = parentNode()->parentNode();

    if (grandParent && grandParent->hasTagName(font_faceTag))

        static_cast<SVGFontFaceElement*>(grandParent)->rebuildFontFace();

}

void SVGFontFaceUriElement::insertedIntoDocument()

{

    loadFont();

    SVGElement::insertedIntoDocument();

}

void SVGFontFaceUriElement::loadFont()

{

    if (m_cachedFont)

        m_cachedFont->removeClient(this);

    String href = getAttribute(XLinkNames::hrefAttr);

    if (!href.isNull()) {        

        DocLoader* docLoader = document()->docLoader();

        m_cachedFont = docLoader->requestFont(href);

        if (m_cachedFont) {

            m_cachedFont->setSVGFont(true);

            m_cachedFont->addClient(this);

            m_cachedFont->beginLoadIfNeeded(docLoader);

        }

    } else

        m_cachedFont = 0;

}

}

#endif // ENABLE(SVG_FONTS)