Update To 11.40.268.0
[platform/framework/web/crosswalk.git] / src / 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/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"
38
39 namespace blink {
40
41 static const double fontLoadWaitLimitSec = 3.0;
42
43 enum FontPackageFormat {
44     PackageFormatUnknown,
45     PackageFormatSFNT,
46     PackageFormatWOFF,
47     PackageFormatWOFF2,
48     PackageFormatSVG,
49     PackageFormatEnumMax
50 };
51
52 static FontPackageFormat packageFormatOf(SharedBuffer* buffer)
53 {
54     if (buffer->size() < 4)
55         return PackageFormatUnknown;
56
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;
63 }
64
65 static void recordPackageFormatHistogram(FontPackageFormat format)
66 {
67     blink::Platform::current()->histogramEnumeration("WebFont.PackageFormat", format, PackageFormatEnumMax);
68 }
69
70 FontResource::FontResource(const ResourceRequest& resourceRequest)
71     : Resource(resourceRequest, Font)
72     , m_state(Unloaded)
73     , m_exceedsFontLoadWaitLimit(false)
74     , m_corsFailed(false)
75     , m_fontLoadWaitLimitTimer(this, &FontResource::fontLoadWaitLimitCallback)
76 {
77 }
78
79 FontResource::~FontResource()
80 {
81 }
82
83 void FontResource::didScheduleLoad()
84 {
85     if (m_state == Unloaded)
86         m_state = LoadScheduled;
87 }
88
89 void FontResource::didUnscheduleLoad()
90 {
91     if (m_state == LoadScheduled)
92         m_state = Unloaded;
93 }
94
95 void FontResource::load(ResourceFetcher*, const ResourceLoaderOptions& options)
96 {
97     // Don't load the file yet. Wait for an access before triggering the load.
98     setLoading(true);
99     m_options = options;
100 }
101
102 void FontResource::didAddClient(ResourceClient* c)
103 {
104     ASSERT(c->resourceClientType() == FontResourceClient::expectedType());
105     Resource::didAddClient(c);
106     if (!isLoading())
107         static_cast<FontResourceClient*>(c)->fontLoaded(this);
108 }
109
110 void FontResource::beginLoadIfNeeded(ResourceFetcher* dl)
111 {
112     if (m_state != LoadInitiated) {
113         m_state = LoadInitiated;
114         Resource::load(dl, m_options);
115         m_fontLoadWaitLimitTimer.startOneShot(fontLoadWaitLimitSec, FROM_HERE);
116
117         ResourceClientWalker<FontResourceClient> walker(m_clients);
118         while (FontResourceClient* client = walker.next())
119             client->didStartFontLoad(this);
120     }
121 }
122
123 bool FontResource::ensureCustomFontData()
124 {
125     if (!m_fontData && !errorOccurred() && !isLoading()) {
126         if (m_data)
127             m_fontData = FontCustomPlatformData::create(m_data.get());
128
129         if (m_fontData) {
130             recordPackageFormatHistogram(packageFormatOf(m_data.get()));
131         } else {
132             setStatus(DecodeError);
133             recordPackageFormatHistogram(PackageFormatUnknown);
134         }
135     }
136     return m_fontData;
137 }
138
139 FontPlatformData FontResource::platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation orientation, FontWidthVariant widthVariant)
140 {
141     ASSERT(m_fontData);
142     return m_fontData->fontPlatformData(size, bold, italic, orientation, widthVariant);
143 }
144
145 bool FontResource::isSafeToUnlock() const
146 {
147     return m_data->hasOneRef();
148 }
149
150 void FontResource::fontLoadWaitLimitCallback(Timer<FontResource>*)
151 {
152     if (!isLoading())
153         return;
154     m_exceedsFontLoadWaitLimit = true;
155     ResourceClientWalker<FontResourceClient> walker(m_clients);
156     while (FontResourceClient* client = walker.next())
157         client->fontLoadWaitLimitExceeded(this);
158 }
159
160 void FontResource::allClientsRemoved()
161 {
162     m_fontData.clear();
163     Resource::allClientsRemoved();
164 }
165
166 void FontResource::checkNotify()
167 {
168     m_fontLoadWaitLimitTimer.stop();
169     ResourceClientWalker<FontResourceClient> w(m_clients);
170     while (FontResourceClient* c = w.next())
171         c->fontLoaded(this);
172 }
173
174 }