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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "config.h"
      6 #if ENABLE(SVG_FONTS)
      7 #include "core/svg/SVGRemoteFontFaceSource.h"
      8 
      9 #include "core/SVGNames.h"
     10 #include "core/css/FontLoader.h"
     11 #include "core/dom/ElementTraversal.h"
     12 #include "core/svg/SVGFontData.h"
     13 #include "core/svg/SVGFontElement.h"
     14 #include "core/svg/SVGFontFaceElement.h"
     15 #include "platform/fonts/FontDescription.h"
     16 #include "platform/fonts/SimpleFontData.h"
     17 
     18 namespace WebCore {
     19 
     20 SVGRemoteFontFaceSource::SVGRemoteFontFaceSource(const String& uri, FontResource* font, PassRefPtrWillBeRawPtr<FontLoader> fontLoader)
     21     : RemoteFontFaceSource(font, fontLoader)
     22     , m_uri(uri)
     23 {
     24 }
     25 
     26 SVGRemoteFontFaceSource::~SVGRemoteFontFaceSource()
     27 {
     28 }
     29 
     30 bool SVGRemoteFontFaceSource::ensureFontData()
     31 {
     32     return resource()->ensureSVGFontData();
     33 }
     34 
     35 PassRefPtr<SimpleFontData> SVGRemoteFontFaceSource::createFontData(const FontDescription& fontDescription)
     36 {
     37     if (!isLoaded())
     38         return createLoadingFallbackFontData(fontDescription);
     39 
     40     // Parse the external SVG document, and extract the <font> element.
     41     if (!resource()->ensureSVGFontData())
     42         return nullptr;
     43 
     44     if (!m_externalSVGFontElement) {
     45         String fragmentIdentifier;
     46         size_t start = m_uri.find('#');
     47         if (start != kNotFound)
     48             fragmentIdentifier = m_uri.substring(start + 1);
     49         m_externalSVGFontElement = resource()->getSVGFontById(fragmentIdentifier);
     50     }
     51 
     52     if (!m_externalSVGFontElement)
     53         return nullptr;
     54 
     55     // Select first <font-face> child
     56     if (SVGFontFaceElement* fontFaceElement = Traversal<SVGFontFaceElement>::firstChild(*m_externalSVGFontElement)) {
     57         return SimpleFontData::create(
     58             SVGFontData::create(fontFaceElement),
     59             fontDescription.effectiveFontSize(),
     60             fontDescription.isSyntheticBold(),
     61             fontDescription.isSyntheticItalic());
     62     }
     63     return nullptr;
     64 }
     65 
     66 void SVGRemoteFontFaceSource::trace(Visitor* visitor)
     67 {
     68     visitor->trace(m_externalSVGFontElement);
     69     RemoteFontFaceSource::trace(visitor);
     70 }
     71 
     72 } // namespace WebCore
     73 
     74 #endif // ENABLE(SVG_FONTS)
     75