1/*
2 * This file is part of the internal font implementation.  It should not be included by anyone other than
3 * FontMac.cpp, FontWin.cpp and Font.cpp.
4 *
5 * Copyright (C) 2006 Apple Computer, Inc.
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 */
23
24// This file has no guards on purpose in order to detect redundant includes. This is a private header
25// and so this may catch someone trying to include this file in public cpp files.
26
27#include "FontSelector.h"
28#include "SimpleFontData.h"
29#include <wtf/Forward.h>
30
31namespace WebCore {
32
33class Font;
34class GlyphPageTreeNode;
35class GraphicsContext;
36class IntRect;
37class FontDescription;
38class FontPlatformData;
39class FontSelector;
40
41const int cAllFamiliesScanned = -1;
42
43class FontFallbackList : public RefCounted<FontFallbackList> {
44public:
45    static PassRefPtr<FontFallbackList> create() { return adoptRef(new FontFallbackList()); }
46
47    ~FontFallbackList() { releaseFontData(); }
48    void invalidate(PassRefPtr<FontSelector>);
49
50    bool isFixedPitch(const Font* f) const { if (m_pitch == UnknownPitch) determinePitch(f); return m_pitch == FixedPitch; };
51    void determinePitch(const Font*) const;
52
53    bool loadingCustomFonts() const { return m_loadingCustomFonts; }
54
55    FontSelector* fontSelector() const { return m_fontSelector.get(); }
56    unsigned generation() const { return m_generation; }
57
58private:
59    FontFallbackList();
60
61    const SimpleFontData* primarySimpleFontData(const Font* f)
62    {
63        ASSERT(isMainThread());
64        if (!m_cachedPrimarySimpleFontData)
65            m_cachedPrimarySimpleFontData = primaryFontData(f)->fontDataForCharacter(' ');
66        return m_cachedPrimarySimpleFontData;
67    }
68
69    const FontData* primaryFontData(const Font* f) const { return fontDataAt(f, 0); }
70    const FontData* fontDataAt(const Font*, unsigned index) const;
71    const FontData* fontDataForCharacters(const Font*, const UChar*, int length) const;
72
73    void setPlatformFont(const FontPlatformData&);
74
75    void releaseFontData();
76
77    mutable Vector<pair<const FontData*, bool>, 1> m_fontList;
78    mutable HashMap<int, GlyphPageTreeNode*> m_pages;
79    mutable GlyphPageTreeNode* m_pageZero;
80    mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
81    RefPtr<FontSelector> m_fontSelector;
82    mutable int m_familyIndex;
83    mutable Pitch m_pitch;
84    mutable bool m_loadingCustomFonts;
85    unsigned m_generation;
86
87    friend class Font;
88};
89
90}
91
92