2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Torch Mobile, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include "core/fetch/FontResource.h"
30 #include "core/dom/TagCollection.h"
31 #include "core/fetch/ResourceClientWalker.h"
32 #include "core/html/parser/TextResourceDecoder.h"
33 #include "platform/SharedBuffer.h"
34 #include "platform/fonts/FontCustomPlatformData.h"
35 #include "platform/fonts/FontPlatformData.h"
36 #include "public/platform/Platform.h"
37 #include "wtf/CurrentTime.h"
41 static const double fontLoadWaitLimitSec = 3.0;
43 enum FontPackageFormat {
52 static FontPackageFormat packageFormatOf(SharedBuffer* buffer)
54 if (buffer->size() < 4)
55 return PackageFormatUnknown;
57 const char* data = buffer->data();
58 if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == 'F')
59 return PackageFormatWOFF;
60 if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == '2')
61 return PackageFormatWOFF2;
62 return PackageFormatSFNT;
65 static void recordPackageFormatHistogram(FontPackageFormat format)
67 blink::Platform::current()->histogramEnumeration("WebFont.PackageFormat", format, PackageFormatEnumMax);
70 FontResource::FontResource(const ResourceRequest& resourceRequest)
71 : Resource(resourceRequest, Font)
73 , m_exceedsFontLoadWaitLimit(false)
75 , m_fontLoadWaitLimitTimer(this, &FontResource::fontLoadWaitLimitCallback)
79 FontResource::~FontResource()
83 void FontResource::didScheduleLoad()
85 if (m_state == Unloaded)
86 m_state = LoadScheduled;
89 void FontResource::didUnscheduleLoad()
91 if (m_state == LoadScheduled)
95 void FontResource::load(ResourceFetcher*, const ResourceLoaderOptions& options)
97 // Don't load the file yet. Wait for an access before triggering the load.
102 void FontResource::didAddClient(ResourceClient* c)
104 ASSERT(c->resourceClientType() == FontResourceClient::expectedType());
105 Resource::didAddClient(c);
107 static_cast<FontResourceClient*>(c)->fontLoaded(this);
110 void FontResource::beginLoadIfNeeded(ResourceFetcher* dl)
112 if (m_state != LoadInitiated) {
113 m_state = LoadInitiated;
114 Resource::load(dl, m_options);
115 m_fontLoadWaitLimitTimer.startOneShot(fontLoadWaitLimitSec, FROM_HERE);
117 ResourceClientWalker<FontResourceClient> walker(m_clients);
118 while (FontResourceClient* client = walker.next())
119 client->didStartFontLoad(this);
123 bool FontResource::ensureCustomFontData()
125 if (!m_fontData && !errorOccurred() && !isLoading()) {
127 m_fontData = FontCustomPlatformData::create(m_data.get());
130 recordPackageFormatHistogram(packageFormatOf(m_data.get()));
132 setStatus(DecodeError);
133 recordPackageFormatHistogram(PackageFormatUnknown);
139 FontPlatformData FontResource::platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation orientation, FontWidthVariant widthVariant)
142 return m_fontData->fontPlatformData(size, bold, italic, orientation, widthVariant);
145 bool FontResource::isSafeToUnlock() const
147 return m_data->hasOneRef();
150 void FontResource::fontLoadWaitLimitCallback(Timer<FontResource>*)
154 m_exceedsFontLoadWaitLimit = true;
155 ResourceClientWalker<FontResourceClient> walker(m_clients);
156 while (FontResourceClient* client = walker.next())
157 client->fontLoadWaitLimitExceeded(this);
160 void FontResource::allClientsRemoved()
163 Resource::allClientsRemoved();
166 void FontResource::checkNotify()
168 m_fontLoadWaitLimitTimer.stop();
169 ResourceClientWalker<FontResourceClient> w(m_clients);
170 while (FontResourceClient* c = w.next())