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1 /*
2  * Copyright (C) 2007 Eric Seidel <eric@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 
SVGFontFaceUriElement(const QualifiedName & tagName,Document * document)39 inline SVGFontFaceUriElement::SVGFontFaceUriElement(const QualifiedName& tagName, Document* document)
40     : SVGElement(tagName, document)
41 {
42 }
43 
create(const QualifiedName & tagName,Document * document)44 PassRefPtr<SVGFontFaceUriElement> SVGFontFaceUriElement::create(const QualifiedName& tagName, Document* document)
45 {
46     return adoptRef(new SVGFontFaceUriElement(tagName, document));
47 }
48 
~SVGFontFaceUriElement()49 SVGFontFaceUriElement::~SVGFontFaceUriElement()
50 {
51     if (m_cachedFont)
52         m_cachedFont->removeClient(this);
53 }
54 
srcValue() const55 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 
parseMappedAttribute(Attribute * attr)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 
childrenChanged(bool changedByParser,Node * beforeChange,Node * afterChange,int childCountDelta)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 
insertedIntoDocument()84 void SVGFontFaceUriElement::insertedIntoDocument()
85 {
86     loadFont();
87     SVGElement::insertedIntoDocument();
88 }
89 
loadFont()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