Long live Qt 4.5!

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diff --git a/src/gui/text/qfont_p.h b/src/gui/text/qfont_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QFONT_P_H
+#define QFONT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of internal files.  This header file may change from version to version
+// without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "QtGui/qfont.h"
+#include "QtCore/qmap.h"
+#include "QtCore/qobject.h"
+#include <private/qunicodetables_p.h>
+#include <QtGui/qfontdatabase.h>
+#include "private/qfixed_p.h"
+
+QT_BEGIN_NAMESPACE
+
+// forwards
+class QFontCache;
+class QFontEngine;
+
+struct QFontDef
+{
+    inline QFontDef()
+        : pointSize(-1.0), pixelSize(-1),
+          styleStrategy(QFont::PreferDefault), styleHint(QFont::AnyStyle),
+          weight(50), fixedPitch(false), style(QFont::StyleNormal), stretch(100),
+          ignorePitch(true)
+#ifdef Q_WS_MAC
+          ,fixedPitchComputed(false)
+#endif
+    {
+    }
+
+    QString family;
+
+#ifdef Q_WS_X11
+    QString addStyle;
+#endif // Q_WS_X11
+
+    qreal pointSize;
+    int pixelSize;
+
+    uint styleStrategy : 16;
+    uint styleHint     : 8;
+
+    uint weight     :  7; // 0-99
+    uint fixedPitch :  1;
+    uint style      :  2;
+    uint stretch    : 12; // 0-400
+
+    uint ignorePitch : 1;
+    uint fixedPitchComputed : 1; // for Mac OS X only
+    int reserved   : 16; // for future extensions
+
+    bool exactMatch(const QFontDef &other) const;
+    bool operator==(const QFontDef &other) const
+    {
+        return pixelSize == other.pixelSize
+                    && weight == other.weight
+                    && style == other.style
+                    && stretch == other.stretch
+                    && styleHint == other.styleHint
+                    && styleStrategy == other.styleStrategy
+                    && ignorePitch == other.ignorePitch && fixedPitch == other.fixedPitch
+                    && family == other.family
+#ifdef Q_WS_X11
+                    && addStyle == other.addStyle
+#endif
+                          ;
+    }
+    inline bool operator<(const QFontDef &other) const
+    {
+        if (pixelSize != other.pixelSize) return pixelSize < other.pixelSize;
+        if (weight != other.weight) return weight < other.weight;
+        if (style != other.style) return style < other.style;
+        if (stretch != other.stretch) return stretch < other.stretch;
+        if (styleHint != other.styleHint) return styleHint < other.styleHint;
+        if (styleStrategy != other.styleStrategy) return styleStrategy < other.styleStrategy;
+        if (family != other.family) return family < other.family;
+
+#ifdef Q_WS_X11
+        if (addStyle != other.addStyle) return addStyle < other.addStyle;
+#endif // Q_WS_X11
+
+        if (ignorePitch != other.ignorePitch) return ignorePitch < other.ignorePitch;
+        if (fixedPitch != other.fixedPitch) return fixedPitch < other.fixedPitch;
+        return false;
+    }
+};
+
+class QFontEngineData
+{
+public:
+    QFontEngineData();
+    ~QFontEngineData();
+
+    QAtomicInt ref;
+    QFontCache *fontCache;
+
+#if !defined(Q_WS_MAC)
+    QFontEngine *engines[QUnicodeTables::ScriptCount];
+#else
+    QFontEngine *engine;
+#endif
+};
+
+
+class Q_GUI_EXPORT QFontPrivate
+{
+public:
+#ifdef Q_WS_X11
+    static int defaultEncodingID;
+#endif // Q_WS_X11
+
+    QFontPrivate();
+    QFontPrivate(const QFontPrivate &other);
+    ~QFontPrivate();
+
+    QFontEngine *engineForScript(int script) const;
+    void alterCharForCapitalization(QChar &c) const;
+
+    QAtomicInt ref;
+    QFontDef request;
+    mutable QFontEngineData *engineData;
+    int dpi;
+    int screen;
+
+#ifdef Q_WS_WIN
+    HDC hdc;
+#endif
+
+    uint rawMode    :  1;
+    uint underline  :  1;
+    uint overline   :  1;
+    uint strikeOut  :  1;
+    uint kerning    :  1;
+    uint capital    :  3;
+    bool letterSpacingIsAbsolute : 1;
+
+    QFixed letterSpacing;
+    QFixed wordSpacing;
+
+    mutable QFontPrivate *scFont;
+    QFont smallCapsFont() const { return QFont(smallCapsFontPrivate()); }
+    QFontPrivate *smallCapsFontPrivate() const;
+
+    void resolve(uint mask, const QFontPrivate *other);
+private:
+    QFontPrivate &operator=(const QFontPrivate &) { return *this; }
+};
+
+
+class QFontCache : public QObject
+{
+    Q_OBJECT
+public:
+    // note: these static functions work on a per-thread basis
+    static QFontCache *instance();
+    static void cleanup();
+
+    QFontCache();
+    ~QFontCache();
+
+    void clear();
+#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_QPF2)
+    void removeEngineForFont(const QByteArray &fontName);
+#endif
+    // universal key structure.  QFontEngineDatas and QFontEngines are cached using
+    // the same keys
+    struct Key {
+        Key() : script(0), screen(0) { }
+        Key(const QFontDef &d, int c, int s = 0)
+            : def(d), script(c), screen(s) { }
+
+        QFontDef def;
+        int script;
+        int screen;
+
+        inline bool operator<(const Key &other) const
+        {
+            if (script != other.script) return script < other.script;
+            if (screen != other.screen) return screen < other.screen;
+            return def < other.def;
+        }
+        inline bool operator==(const Key &other) const
+        { return def == other.def && script == other.script && screen == other.screen; }
+    };
+
+    // QFontEngineData cache
+    typedef QMap<Key,QFontEngineData*> EngineDataCache;
+    EngineDataCache engineDataCache;
+
+    QFontEngineData *findEngineData(const Key &key) const;
+    void insertEngineData(const Key &key, QFontEngineData *engineData);
+
+    // QFontEngine cache
+    struct Engine {
+        Engine() : data(0), timestamp(0), hits(0) { }
+        Engine(QFontEngine *d) : data(d), timestamp(0), hits(0) { }
+
+        QFontEngine *data;
+        uint timestamp;
+        uint hits;
+    };
+
+    typedef QMap<Key,Engine> EngineCache;
+    EngineCache engineCache;
+
+    QFontEngine *findEngine(const Key &key);
+    void insertEngine(const Key &key, QFontEngine *engine);
+
+#if defined(Q_WS_WIN) || defined(Q_WS_QWS)
+    void cleanupPrinterFonts();
+#endif
+
+    private:
+    void increaseCost(uint cost);
+    void decreaseCost(uint cost);
+    void timerEvent(QTimerEvent *event);
+
+    static const uint min_cost;
+    uint total_cost, max_cost;
+    uint current_timestamp;
+    bool fast;
+    int timer_id;
+};
+
+QT_END_NAMESPACE
+
+#endif // QFONT_P_H