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      1 /*
      2  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      3  * Copyright (C) 2009 Apple Inc. All rights reserved.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #include "config.h"
     22 
     23 #if ENABLE(SVG_FONTS)
     24 #include "SVGFontFaceUriElement.h"
     25 
     26 #include "Attribute.h"
     27 #include "CSSFontFaceSrcValue.h"
     28 #include "CachedFont.h"
     29 #include "CachedResourceLoader.h"
     30 #include "Document.h"
     31 #include "SVGFontFaceElement.h"
     32 #include "SVGNames.h"
     33 #include "XLinkNames.h"
     34 
     35 namespace WebCore {
     36 
     37 using namespace SVGNames;
     38 
     39 inline SVGFontFaceUriElement::SVGFontFaceUriElement(const QualifiedName& tagName, Document* document)
     40     : SVGElement(tagName, document)
     41 {
     42 }
     43 
     44 PassRefPtr<SVGFontFaceUriElement> SVGFontFaceUriElement::create(const QualifiedName& tagName, Document* document)
     45 {
     46     return adoptRef(new SVGFontFaceUriElement(tagName, document));
     47 }
     48 
     49 SVGFontFaceUriElement::~SVGFontFaceUriElement()
     50 {
     51     if (m_cachedFont)
     52         m_cachedFont->removeClient(this);
     53 }
     54 
     55 PassRefPtr<CSSFontFaceSrcValue> SVGFontFaceUriElement::srcValue() const
     56 {
     57     RefPtr<CSSFontFaceSrcValue> src = CSSFontFaceSrcValue::create(getAttribute(XLinkNames::hrefAttr));
     58     AtomicString value(getAttribute(formatAttr));
     59     src->setFormat(value.isEmpty() ? "svg" : value); // Default format
     60     return src.release();
     61 }
     62 
     63 void SVGFontFaceUriElement::parseMappedAttribute(Attribute* attr)
     64 {
     65     const QualifiedName& attrName = attr->name();
     66     if (attrName == XLinkNames::hrefAttr)
     67         loadFont();
     68     else
     69         SVGElement::parseMappedAttribute(attr);
     70 }
     71 
     72 void SVGFontFaceUriElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
     73 {
     74     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     75 
     76     if (!parentNode() || !parentNode()->hasTagName(font_face_srcTag))
     77         return;
     78 
     79     ContainerNode* grandparent = parentNode()->parentNode();
     80     if (grandparent && grandparent->hasTagName(font_faceTag))
     81         static_cast<SVGFontFaceElement*>(grandparent)->rebuildFontFace();
     82 }
     83 
     84 void SVGFontFaceUriElement::insertedIntoDocument()
     85 {
     86     loadFont();
     87     SVGElement::insertedIntoDocument();
     88 }
     89 
     90 void SVGFontFaceUriElement::loadFont()
     91 {
     92     if (m_cachedFont)
     93         m_cachedFont->removeClient(this);
     94 
     95     String href = getAttribute(XLinkNames::hrefAttr);
     96     if (!href.isNull()) {
     97         CachedResourceLoader* cachedResourceLoader = document()->cachedResourceLoader();
     98         m_cachedFont = cachedResourceLoader->requestFont(href);
     99         if (m_cachedFont) {
    100             m_cachedFont->addClient(this);
    101             m_cachedFont->beginLoadIfNeeded(cachedResourceLoader);
    102         }
    103     } else
    104         m_cachedFont = 0;
    105 }
    106 
    107 }
    108 
    109 #endif // ENABLE(SVG_FONTS)
    110