Home | History | Annotate | Download | only in fetch 
      1 /*
      2  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2009 Torch Mobile, Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "core/fetch/FontResource.h"
     29 
     30 #include "core/fetch/ResourceClientWalker.h"
     31 #include "core/fetch/TextResourceDecoder.h"
     32 #include "platform/SharedBuffer.h"
     33 #include "platform/fonts/FontCustomPlatformData.h"
     34 #include "platform/fonts/FontPlatformData.h"
     35 #include "public/platform/Platform.h"
     36 #include "wtf/CurrentTime.h"
     37 
     38 #if ENABLE(SVG_FONTS)
     39 #include "SVGNames.h"
     40 #include "core/dom/NodeList.h"
     41 #include "core/svg/SVGDocument.h"
     42 #include "core/svg/SVGFontElement.h"
     43 #endif
     44 
     45 namespace WebCore {
     46 
     47 FontResource::FontResource(const ResourceRequest& resourceRequest)
     48     : Resource(resourceRequest, Font)
     49     , m_loadInitiated(false)
     50 {
     51 }
     52 
     53 FontResource::~FontResource()
     54 {
     55 }
     56 
     57 void FontResource::load(ResourceFetcher*, const ResourceLoaderOptions& options)
     58 {
     59     // Don't load the file yet. Wait for an access before triggering the load.
     60     setLoading(true);
     61     m_options = options;
     62 }
     63 
     64 void FontResource::didAddClient(ResourceClient* c)
     65 {
     66     ASSERT(c->resourceClientType() == FontResourceClient::expectedType());
     67     Resource::didAddClient(c);
     68     if (!isLoading())
     69         static_cast<FontResourceClient*>(c)->fontLoaded(this);
     70 }
     71 
     72 void FontResource::beginLoadIfNeeded(ResourceFetcher* dl)
     73 {
     74     if (!m_loadInitiated) {
     75         m_loadInitiated = true;
     76         Resource::load(dl, m_options);
     77 
     78         ResourceClientWalker<FontResourceClient> walker(m_clients);
     79         while (FontResourceClient* client = walker.next())
     80             client->didStartFontLoad(this);
     81     }
     82 }
     83 
     84 bool FontResource::ensureCustomFontData()
     85 {
     86     if (!m_fontData && !errorOccurred() && !isLoading()) {
     87         if (m_data)
     88             m_fontData = FontCustomPlatformData::create(m_data.get());
     89         if (!m_fontData)
     90             setStatus(DecodeError);
     91     }
     92     return m_fontData;
     93 }
     94 
     95 FontPlatformData FontResource::platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation orientation, FontWidthVariant widthVariant)
     96 {
     97 #if ENABLE(SVG_FONTS)
     98     if (m_externalSVGDocument)
     99         return FontPlatformData(size, bold, italic);
    100 #endif
    101     ASSERT(m_fontData);
    102     return m_fontData->fontPlatformData(size, bold, italic, orientation, widthVariant);
    103 }
    104 
    105 #if ENABLE(SVG_FONTS)
    106 bool FontResource::ensureSVGFontData()
    107 {
    108     if (!m_externalSVGDocument && !errorOccurred() && !isLoading()) {
    109         if (m_data) {
    110             m_externalSVGDocument = SVGDocument::create();
    111 
    112             OwnPtr<TextResourceDecoder> decoder = TextResourceDecoder::create("application/xml");
    113             String svgSource = decoder->decode(m_data->data(), m_data->size());
    114             svgSource.append(decoder->flush());
    115 
    116             m_externalSVGDocument->setContent(svgSource);
    117 
    118             if (decoder->sawError())
    119                 m_externalSVGDocument = 0;
    120         }
    121         if (!m_externalSVGDocument)
    122             setStatus(DecodeError);
    123     }
    124 
    125     return m_externalSVGDocument;
    126 }
    127 
    128 SVGFontElement* FontResource::getSVGFontById(const String& fontName) const
    129 {
    130     RefPtr<NodeList> list = m_externalSVGDocument->getElementsByTagNameNS(SVGNames::fontTag.namespaceURI(), SVGNames::fontTag.localName());
    131     if (!list)
    132         return 0;
    133 
    134     unsigned listLength = list->length();
    135     if (!listLength)
    136         return 0;
    137 
    138 #ifndef NDEBUG
    139     for (unsigned i = 0; i < listLength; ++i) {
    140         ASSERT(list->item(i));
    141         ASSERT(list->item(i)->hasTagName(SVGNames::fontTag));
    142     }
    143 #endif
    144 
    145     if (fontName.isEmpty())
    146         return toSVGFontElement(list->item(0));
    147 
    148     for (unsigned i = 0; i < listLength; ++i) {
    149         SVGFontElement* element = toSVGFontElement(list->item(i));
    150         if (element->getIdAttribute() == fontName)
    151             return element;
    152     }
    153 
    154     return 0;
    155 }
    156 #endif
    157 
    158 void FontResource::allClientsRemoved()
    159 {
    160     m_fontData.clear();
    161     Resource::allClientsRemoved();
    162 }
    163 
    164 void FontResource::checkNotify()
    165 {
    166     ResourceClientWalker<FontResourceClient> w(m_clients);
    167     while (FontResourceClient* c = w.next())
    168         c->fontLoaded(this);
    169 }
    170 
    171 }
    172