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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 "CSSFontFaceSrcValue.h"
     27 #include "CachedFont.h"
     28 #include "DocLoader.h"
     29 #include "Document.h"
     30 #include "MappedAttribute.h"
     31 #include "SVGFontFaceElement.h"
     32 #include "SVGNames.h"
     33 #include "XLinkNames.h"
     34 
     35 namespace WebCore {
     36 
     37 using namespace SVGNames;
     38 
     39 SVGFontFaceUriElement::SVGFontFaceUriElement(const QualifiedName& tagName, Document* doc)
     40     : SVGElement(tagName, doc)
     41 {
     42 }
     43 
     44 SVGFontFaceUriElement::~SVGFontFaceUriElement()
     45 {
     46     if (m_cachedFont)
     47         m_cachedFont->removeClient(this);
     48 }
     49 
     50 PassRefPtr<CSSFontFaceSrcValue> SVGFontFaceUriElement::srcValue() const
     51 {
     52     RefPtr<CSSFontFaceSrcValue> src = CSSFontFaceSrcValue::create(getAttribute(XLinkNames::hrefAttr));
     53     AtomicString value(getAttribute(formatAttr));
     54     src->setFormat(value.isEmpty() ? "svg" : value); // Default format
     55     return src.release();
     56 }
     57 
     58 void SVGFontFaceUriElement::parseMappedAttribute(MappedAttribute* attr)
     59 {
     60     const QualifiedName& attrName = attr->name();
     61     if (attrName == XLinkNames::hrefAttr)
     62         loadFont();
     63     else
     64         SVGElement::parseMappedAttribute(attr);
     65 }
     66 
     67 void SVGFontFaceUriElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
     68 {
     69     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     70 
     71     if (!parentNode() || !parentNode()->hasTagName(font_face_srcTag))
     72         return;
     73 
     74     Node* grandParent = parentNode()->parentNode();
     75     if (grandParent && grandParent->hasTagName(font_faceTag))
     76         static_cast<SVGFontFaceElement*>(grandParent)->rebuildFontFace();
     77 }
     78 
     79 void SVGFontFaceUriElement::insertedIntoDocument()
     80 {
     81     loadFont();
     82     SVGElement::insertedIntoDocument();
     83 }
     84 
     85 void SVGFontFaceUriElement::loadFont()
     86 {
     87     if (m_cachedFont)
     88         m_cachedFont->removeClient(this);
     89 
     90     String href = getAttribute(XLinkNames::hrefAttr);
     91     if (!href.isNull()) {
     92         DocLoader* docLoader = document()->docLoader();
     93         m_cachedFont = docLoader->requestFont(href);
     94         if (m_cachedFont) {
     95             m_cachedFont->setSVGFont(true);
     96             m_cachedFont->addClient(this);
     97             m_cachedFont->beginLoadIfNeeded(docLoader);
     98         }
     99     } else
    100         m_cachedFont = 0;
    101 }
    102 
    103 }
    104 
    105 #endif // ENABLE(SVG_FONTS)
    106