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      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/loader/cache/FontResource.h"
     29 
     30 #include "core/loader/TextResourceDecoder.h"
     31 #include "core/loader/cache/ResourceClient.h"
     32 #include "core/loader/cache/ResourceClientWalker.h"
     33 #include "core/platform/SharedBuffer.h"
     34 #include "core/platform/graphics/FontCustomPlatformData.h"
     35 #include "core/platform/graphics/FontPlatformData.h"
     36 
     37 #if ENABLE(SVG_FONTS)
     38 #include "SVGNames.h"
     39 #include "core/dom/NodeList.h"
     40 #include "core/svg/SVGDocument.h"
     41 #include "core/svg/SVGFontElement.h"
     42 #endif
     43 
     44 namespace WebCore {
     45 
     46 FontResource::FontResource(const ResourceRequest& resourceRequest)
     47     : Resource(resourceRequest, Font)
     48     , m_loadInitiated(false)
     49 {
     50 }
     51 
     52 FontResource::~FontResource()
     53 {
     54 }
     55 
     56 void FontResource::load(ResourceFetcher*, const ResourceLoaderOptions& options)
     57 {
     58     // Don't load the file yet. Wait for an access before triggering the load.
     59     setLoading(true);
     60     m_options = options;
     61 }
     62 
     63 void FontResource::didAddClient(ResourceClient* c)
     64 {
     65     ASSERT(c->resourceClientType() == FontResourceClient::expectedType());
     66     if (!isLoading())
     67         static_cast<FontResourceClient*>(c)->fontLoaded(this);
     68 }
     69 
     70 void FontResource::beginLoadIfNeeded(ResourceFetcher* dl)
     71 {
     72     if (!m_loadInitiated) {
     73         m_loadInitiated = true;
     74         Resource::load(dl, m_options);
     75 
     76         ResourceClientWalker<FontResourceClient> walker(m_clients);
     77         while (FontResourceClient* client = walker.next())
     78             client->didStartFontLoad(this);
     79     }
     80 }
     81 
     82 bool FontResource::ensureCustomFontData()
     83 {
     84     if (!m_fontData && !errorOccurred() && !isLoading() && m_data) {
     85         m_fontData = FontCustomPlatformData::create(m_data.get());
     86         if (!m_fontData)
     87             setStatus(DecodeError);
     88     }
     89     return m_fontData;
     90 }
     91 
     92 FontPlatformData FontResource::platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation orientation, FontWidthVariant widthVariant)
     93 {
     94 #if ENABLE(SVG_FONTS)
     95     if (m_externalSVGDocument)
     96         return FontPlatformData(size, bold, italic);
     97 #endif
     98     ASSERT(m_fontData);
     99     return m_fontData->fontPlatformData(static_cast<int>(size), bold, italic, orientation, widthVariant);
    100 }
    101 
    102 #if ENABLE(SVG_FONTS)
    103 bool FontResource::ensureSVGFontData()
    104 {
    105     if (!m_externalSVGDocument && !errorOccurred() && !isLoading() && m_data) {
    106         m_externalSVGDocument = SVGDocument::create();
    107 
    108         RefPtr<TextResourceDecoder> decoder = TextResourceDecoder::create("application/xml");
    109         String svgSource = decoder->decode(m_data->data(), m_data->size());
    110         svgSource.append(decoder->flush());
    111 
    112         m_externalSVGDocument->setContent(svgSource);
    113 
    114         if (decoder->sawError())
    115             m_externalSVGDocument = 0;
    116     }
    117 
    118     return m_externalSVGDocument;
    119 }
    120 
    121 SVGFontElement* FontResource::getSVGFontById(const String& fontName) const
    122 {
    123     RefPtr<NodeList> list = m_externalSVGDocument->getElementsByTagNameNS(SVGNames::fontTag.namespaceURI(), SVGNames::fontTag.localName());
    124     if (!list)
    125         return 0;
    126 
    127     unsigned listLength = list->length();
    128     if (!listLength)
    129         return 0;
    130 
    131 #ifndef NDEBUG
    132     for (unsigned i = 0; i < listLength; ++i) {
    133         ASSERT(list->item(i));
    134         ASSERT(list->item(i)->hasTagName(SVGNames::fontTag));
    135     }
    136 #endif
    137 
    138     if (fontName.isEmpty())
    139         return toSVGFontElement(list->item(0));
    140 
    141     for (unsigned i = 0; i < listLength; ++i) {
    142         SVGFontElement* element = toSVGFontElement(list->item(i));
    143         if (element->getIdAttribute() == fontName)
    144             return element;
    145     }
    146 
    147     return 0;
    148 }
    149 #endif
    150 
    151 void FontResource::allClientsRemoved()
    152 {
    153     m_fontData.clear();
    154     Resource::allClientsRemoved();
    155 }
    156 
    157 void FontResource::checkNotify()
    158 {
    159     ResourceClientWalker<FontResourceClient> w(m_clients);
    160     while (FontResourceClient* c = w.next())
    161         c->fontLoaded(this);
    162 }
    163 
    164 }
    165