1 /*
2 Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
3 Copyright (C) 2008 Holger Hans Peter Freyther
4 Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
5 Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public License
18 along with this library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA.
21
22 This class provides all functionality needed for loading images, style sheets and html
23 pages from the web. It has a memory cache for these objects.
24 */
25 #include "config.h"
26 #include "FontCache.h"
27
28 #include "FontDescription.h"
29 #include "FontPlatformData.h"
30 #include "Font.h"
31 #include "PlatformString.h"
32 #include <utility>
33 #include <wtf/ListHashSet.h>
34 #include <wtf/StdLibExtras.h>
35 #include <wtf/text/StringHash.h>
36
37 #include <QFont>
38 #include <QFontDatabase>
39 #if HAVE(QRAWFONT)
40 #include <QTextLayout>
41 #endif
42
43 using namespace WTF;
44
45 namespace WebCore {
46
platformInit()47 void FontCache::platformInit()
48 {
49 }
50
51 #if HAVE(QRAWFONT)
rawFontForCharacters(const QString & string,const QFont & requestedFont)52 static QRawFont rawFontForCharacters(const QString& string, const QFont& requestedFont)
53 {
54 QFont font(requestedFont);
55 font.setStyleStrategy(QFont::NoFontMerging);
56
57 QTextLayout layout(string, font);
58 layout.beginLayout();
59 layout.createLine();
60 layout.endLayout();
61
62 QList<QGlyphs> glyphList = layout.glyphs();
63
64 ASSERT(glyphList.size() == 1);
65
66 const QGlyphs& glyphs(glyphList.at(0));
67 QVector<quint32> glyphIndexes = glyphs.glyphIndexes();
68
69 if (glyphIndexes.isEmpty())
70 return QRawFont();
71
72 return glyphs.font();
73 }
74 #endif
75
getFontDataForCharacters(const Font & font,const UChar * characters,int length)76 const SimpleFontData* FontCache::getFontDataForCharacters(const Font& font, const UChar* characters, int length)
77 {
78 #if HAVE(QRAWFONT)
79 QString qstring = QString::fromRawData(reinterpret_cast<const QChar*>(characters), length);
80 QRawFont computedFont = rawFontForCharacters(qstring, font.font());
81 if (!computedFont.isValid())
82 return 0;
83 FontPlatformData alternateFont(computedFont);
84 return getCachedFontData(&alternateFont);
85 #else
86 Q_UNUSED(font);
87 Q_UNUSED(characters);
88 Q_UNUSED(length);
89 return 0;
90 #endif
91 }
92
getSimilarFontPlatformData(const Font & font)93 SimpleFontData* FontCache::getSimilarFontPlatformData(const Font& font)
94 {
95 return 0;
96 }
97
getLastResortFallbackFont(const FontDescription & fontDescription)98 SimpleFontData* FontCache::getLastResortFallbackFont(const FontDescription& fontDescription)
99 {
100 const AtomicString fallbackFamily = QFont(fontDescription.family().family()).lastResortFamily();
101 return getCachedFontData(new FontPlatformData(fontDescription, fallbackFamily));
102 }
103
getTraitsInFamily(const AtomicString &,Vector<unsigned> &)104 void FontCache::getTraitsInFamily(const AtomicString&, Vector<unsigned>&)
105 {
106 }
107
createFontPlatformData(const FontDescription & fontDescription,const AtomicString & familyName)108 FontPlatformData* FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& familyName)
109 {
110 QFontDatabase db;
111 if (!db.hasFamily(familyName))
112 return 0;
113
114 return new FontPlatformData(fontDescription, familyName);
115 }
116
117 } // namespace WebCore
118