1 /*
2 * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22 #include "config.h"
23 #include "FontCustomPlatformData.h"
24
25 #include "Base64.h"
26 #include "CachedFont.h"
27 #include "FontPlatformData.h"
28 #include "SharedBuffer.h"
29 #include <wtf/RandomNumber.h>
30
31 namespace WebCore {
32
33 static CustomFontCache* g_customFontCache = 0;
34
35 bool renameFont(SharedBuffer* fontData, const String& fontName);
36
setCustomFontCache(CustomFontCache * cache)37 void setCustomFontCache(CustomFontCache* cache)
38 {
39 g_customFontCache = cache;
40 }
41
~FontCustomPlatformData()42 FontCustomPlatformData::~FontCustomPlatformData()
43 {
44 if (g_customFontCache && !m_name.isEmpty())
45 g_customFontCache->unregisterFont(m_name);
46 }
47
fontPlatformData(int size,bool bold,bool italic,FontOrientation,TextOrientation,FontWidthVariant,FontRenderingMode renderingMode)48 FontPlatformData FontCustomPlatformData::fontPlatformData(int size, bool bold, bool italic, FontOrientation, TextOrientation, FontWidthVariant, FontRenderingMode renderingMode)
49 {
50 FontDescription fontDesc;
51 fontDesc.setComputedSize(size);
52 fontDesc.setSpecifiedSize(size);
53 fontDesc.setItalic(italic);
54 fontDesc.setWeight(bold ? FontWeightBold : FontWeightNormal);
55 return FontPlatformData(fontDesc, m_name, false);
56 }
57
58 // Creates a unique and unpredictable font name, in order to avoid collisions and to
59 // not allow access from CSS.
createUniqueFontName()60 static String createUniqueFontName()
61 {
62 GUID fontUuid;
63
64 unsigned int* ptr = reinterpret_cast<unsigned int*>(&fontUuid);
65 for (int i = 0; i < sizeof(GUID) / sizeof(int) ; ++i)
66 *(ptr + i) = static_cast<unsigned int>(randomNumber() * (std::numeric_limits<unsigned>::max() + 1.0));
67
68 String fontName = base64Encode(reinterpret_cast<char*>(&fontUuid), sizeof(fontUuid));
69 ASSERT(fontName.length() < LF_FACESIZE);
70 return fontName.replace('/', '_');
71 }
72
createFontCustomPlatformData(const SharedBuffer * buffer)73 FontCustomPlatformData* createFontCustomPlatformData(const SharedBuffer* buffer)
74 {
75 if (g_customFontCache) {
76 String fontName = createUniqueFontName();
77 RefPtr<SharedBuffer> localBuffer = SharedBuffer::create(buffer->data(), buffer->size());
78 if (renameFont(localBuffer.get(), fontName) && g_customFontCache->registerFont(fontName, localBuffer.get()))
79 return new FontCustomPlatformData(fontName);
80 }
81 return 0;
82 }
83
supportsFormat(const String & format)84 bool FontCustomPlatformData::supportsFormat(const String& format)
85 {
86 return equalIgnoringCase(format, "truetype") || equalIgnoringCase(format, "opentype");
87 }
88
89 }
90