third_party/WebKit/Source/core/fetch/FontResource.cpp

   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 "platform/SharedBuffer.h"
  32 #include "platform/fonts/FontCustomPlatformData.h"
  33 #include "platform/fonts/FontPlatformData.h"
  34 #include "public/platform/Platform.h"
  35 #include "wtf/CurrentTime.h"
  36
  37 namespace blink {
  38
  39 static const double fontLoadWaitLimitSec = 3.0;
  40
  41 enum FontPackageFormat {
  42     PackageFormatUnknown,
  43     PackageFormatSFNT,
  44     PackageFormatWOFF,
  45     PackageFormatWOFF2,
  46     PackageFormatSVG,
  47     PackageFormatEnumMax
  48 };
  49
  50 static FontPackageFormat packageFormatOf(SharedBuffer* buffer)
  51 {
  52     if (buffer->size() < 4)
  53         return PackageFormatUnknown;
  54
  55     const char* data = buffer->data();
  56     if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == 'F')
  57         return PackageFormatWOFF;
  58     if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == '2')
  59         return PackageFormatWOFF2;
  60     return PackageFormatSFNT;
  61 }
  62
  63 static void recordPackageFormatHistogram(FontPackageFormat format)
  64 {
  65     Platform::current()->histogramEnumeration("WebFont.PackageFormat", format, PackageFormatEnumMax);
  66 }
  67
  68 FontResource::FontResource(const ResourceRequest& resourceRequest)
  69     : Resource(resourceRequest, Font)
  70     , m_state(Unloaded)
  71     , m_exceedsFontLoadWaitLimit(false)
  72     , m_corsFailed(false)
  73     , m_fontLoadWaitLimitTimer(this, &FontResource::fontLoadWaitLimitCallback)
  74 {
  75 }
  76
  77 FontResource::~FontResource()
  78 {
  79 }
  80
  81 void FontResource::didScheduleLoad()
  82 {
  83     if (m_state == Unloaded)
  84         m_state = LoadScheduled;
  85 }
  86
  87 void FontResource::didUnscheduleLoad()
  88 {
  89     if (m_state == LoadScheduled)
  90         m_state = Unloaded;
  91 }
  92
  93 void FontResource::load(ResourceFetcher*, const ResourceLoaderOptions& options)
  94 {
  95     // Don't load the file yet. Wait for an access before triggering the load.
  96     setLoading(true);
  97     m_options = options;
  98 }
  99
 100 void FontResource::didAddClient(ResourceClient* c)
 101 {
 102     ASSERT(c->resourceClientType() == FontResourceClient::expectedType());
 103     Resource::didAddClient(c);
 104     if (!isLoading())
 105         static_cast<FontResourceClient*>(c)->fontLoaded(this);
 106 }
 107
 108 void FontResource::beginLoadIfNeeded(ResourceFetcher* dl)
 109 {
 110     if (m_state != LoadInitiated) {
 111         m_state = LoadInitiated;
 112         Resource::load(dl, m_options);
 113         m_fontLoadWaitLimitTimer.startOneShot(fontLoadWaitLimitSec, FROM_HERE);
 114
 115         ResourceClientWalker<FontResourceClient> walker(m_clients);
 116         while (FontResourceClient* client = walker.next())
 117             client->didStartFontLoad(this);
 118     }
 119 }
 120
 121 bool FontResource::ensureCustomFontData()
 122 {
 123     if (!m_fontData && !errorOccurred() && !isLoading()) {
 124         if (m_data)
 125             m_fontData = FontCustomPlatformData::create(m_data.get());
 126
 127         if (m_fontData) {
 128             recordPackageFormatHistogram(packageFormatOf(m_data.get()));
 129         } else {
 130             setStatus(DecodeError);
 131             recordPackageFormatHistogram(PackageFormatUnknown);
 132         }
 133     }
 134     return m_fontData;
 135 }
 136
 137 FontPlatformData FontResource::platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation orientation)
 138 {
 139     ASSERT(m_fontData);
 140     return m_fontData->fontPlatformData(size, bold, italic, orientation);
 141 }
 142
 143 bool FontResource::isSafeToUnlock() const
 144 {
 145     return m_data->hasOneRef();
 146 }
 147
 148 void FontResource::fontLoadWaitLimitCallback(Timer<FontResource>*)
 149 {
 150     if (!isLoading())
 151         return;
 152     m_exceedsFontLoadWaitLimit = true;
 153     ResourceClientWalker<FontResourceClient> walker(m_clients);
 154     while (FontResourceClient* client = walker.next())
 155         client->fontLoadWaitLimitExceeded(this);
 156 }
 157
 158 void FontResource::allClientsRemoved()
 159 {
 160     m_fontData.clear();
 161     Resource::allClientsRemoved();
 162 }
 163
 164 void FontResource::checkNotify()
 165 {
 166     m_fontLoadWaitLimitTimer.stop();
 167     ResourceClientWalker<FontResourceClient> w(m_clients);
 168     while (FontResourceClient* c = w.next())
 169         c->fontLoaded(this);
 170 }
 171
 172 }