Long live Qt 4.5!

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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 QFONTENGINE_QPF_P_H
+#define QFONTENGINE_QPF_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qfontengine_p.h"
+#include <qendian.h>
+#include <qbuffer.h>
+
+#ifndef QT_NO_QWS_QPF2
+#if !defined(QT_NO_FREETYPE)
+#   include "qfontengine_ft_p.h"
+#endif
+#endif
+
+QT_BEGIN_NAMESPACE
+
+#ifndef QT_NO_QWS_QPF2
+
+class QFontEngine;
+class QFreetypeFace;
+
+class Q_GUI_EXPORT QFontEngineQPF : public QFontEngine
+{
+public:
+    // if you add new tags please make sure to update the tables in
+    // qpfutil.cpp and tools/makeqpf/qpf2.cpp
+    enum HeaderTag {
+        Tag_FontName,          // 0 string
+        Tag_FileName,          // 1 string
+        Tag_FileIndex,         // 2 quint32
+        Tag_FontRevision,      // 3 quint32
+        Tag_FreeText,          // 4 string
+        Tag_Ascent,            // 5 QFixed
+        Tag_Descent,           // 6 QFixed
+        Tag_Leading,           // 7 QFixed
+        Tag_XHeight,           // 8 QFixed
+        Tag_AverageCharWidth,  // 9 QFixed
+        Tag_MaxCharWidth,      // 10 QFixed
+        Tag_LineThickness,     // 11 QFixed
+        Tag_MinLeftBearing,    // 12 QFixed
+        Tag_MinRightBearing,   // 13 QFixed
+        Tag_UnderlinePosition, // 14 QFixed
+        Tag_GlyphFormat,       // 15 quint8
+        Tag_PixelSize,         // 16 quint8
+        Tag_Weight,            // 17 quint8
+        Tag_Style,             // 18 quint8
+        Tag_EndOfHeader,       // 19 string
+        Tag_WritingSystems,    // 20 bitfield
+
+        NumTags
+    };
+
+    enum TagType {
+        StringType,
+        FixedType,
+        UInt8Type,
+        UInt32Type,
+        BitFieldType
+    };
+
+    struct Tag
+    {
+        quint16 tag;
+        quint16 size;
+    };
+
+    enum GlyphFormat {
+        BitmapGlyphs = 1,
+        AlphamapGlyphs = 8
+    };
+
+    enum {
+        CurrentMajorVersion = 2,
+        CurrentMinorVersion = 0
+    };
+
+    // The CMap is identical to the TrueType CMap table format
+    // The GMap table is a normal array with the total number of
+    // covered glyphs in the TrueType font
+    enum BlockTag {
+        CMapBlock,
+        GMapBlock,
+        GlyphBlock
+    };
+
+    struct Q_PACKED Header
+    {
+        char magic[4]; // 'QPF2'
+        quint32 lock;  // values: 0 = unlocked, 0xffffffff = read-only, otherwise qws client id of locking process
+        quint8 majorVersion;
+        quint8 minorVersion;
+        quint16 dataSize;
+    };
+
+    struct Q_PACKED Block
+    {
+        quint16 tag;
+        quint16 pad;
+        quint32 dataSize;
+    };
+
+    struct Q_PACKED Glyph
+    {
+        quint8 width;
+        quint8 height;
+        quint8 bytesPerLine;
+        qint8 x;
+        qint8 y;
+        qint8 advance;
+    };
+
+#ifdef QT_FONTS_ARE_RESOURCES
+    QFontEngineQPF(const QFontDef &def, const uchar *bytes, int size);
+#else
+    QFontEngineQPF(const QFontDef &def, int fd, QFontEngine *renderingFontEngine = 0);
+#endif
+    ~QFontEngineQPF();
+
+    FaceId faceId() const { return face_id; }
+    bool getSfntTableData(uint tag, uchar *buffer, uint *length) const;
+
+    bool stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const;
+    void recalcAdvances(QGlyphLayout *, QTextEngine::ShaperFlags) const;
+
+    void draw(QPaintEngine *p, qreal x, qreal y, const QTextItemInt &si);
+    void addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags);
+    QImage alphaMapForGlyph(glyph_t t);
+
+    glyph_metrics_t boundingBox(const QGlyphLayout &glyphs);
+    glyph_metrics_t boundingBox(glyph_t glyph);
+
+    QFixed ascent() const;
+    QFixed descent() const;
+    QFixed leading() const;
+    qreal maxCharWidth() const;
+    qreal minLeftBearing() const;
+    qreal minRightBearing() const;
+    QFixed underlinePosition() const;
+    QFixed lineThickness() const;
+
+    Type type() const;
+
+    bool canRender(const QChar *string, int len);
+    inline const char *name() const { return "QPF2"; }
+
+    virtual int glyphCount() const { return glyphMapEntries; }
+
+    bool isValid() const;
+
+    const Glyph *findGlyph(glyph_t g) const;
+
+    static bool verifyHeader(const uchar *data, int size);
+    static QVariant extractHeaderField(const uchar *data, HeaderTag tag);
+    static QList<QByteArray> cleanUpAfterClientCrash(const QList<int> &crashedClientIds);
+
+#if !defined(QT_NO_FREETYPE)
+    FT_Face lockFace() const;
+    void unlockFace() const;
+    void doKerning(QGlyphLayout *g, QTextEngine::ShaperFlags flags) const;
+    virtual HB_Error getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints);
+    virtual QFixed emSquareSize() const;
+#endif
+
+    inline QString fontFile() const { return fileName; }
+
+    QFontEngine *renderingEngine() const { return renderingFontEngine; }
+
+    QFontEngine *takeRenderingEngine()
+    {
+        QFontEngine *engine = renderingFontEngine;
+        renderingFontEngine = 0;
+        return engine;
+    }
+
+private:
+#if !defined(QT_NO_FREETYPE)
+    void ensureGlyphsLoaded(const QGlyphLayout &glyphs);
+    void loadGlyph(glyph_t glyph);
+    bool lockFile();
+    void unlockFile();
+    void remapFontData();
+#endif
+
+    int fd;
+    const uchar *fontData;
+    int dataSize;
+    const uchar *externalCMap;
+    quint32 cmapOffset;
+    int cmapSize;
+    quint32 glyphMapOffset;
+    quint32 glyphMapEntries;
+    quint32 glyphDataOffset;
+    quint32 glyphDataSize;
+    QString fileName;
+    bool readOnly;
+
+    QFreetypeFace *freetype;
+    FaceId face_id;
+    QByteArray freetypeCMapTable;
+    mutable bool kerning_pairs_loaded;
+    QFontEngine *renderingFontEngine;
+};
+
+struct QPFGenerator
+{
+    QPFGenerator(QBuffer *device, QFontEngine *engine)
+        : dev(device), fe(engine) {}
+
+    void generate();
+    void writeHeader();
+    void writeGMap();
+    void writeBlock(QFontEngineQPF::BlockTag tag, const QByteArray &data);
+
+    void writeTaggedString(QFontEngineQPF::HeaderTag tag, const QByteArray &string);
+    void writeTaggedUInt32(QFontEngineQPF::HeaderTag tag, quint32 value);
+    void writeTaggedUInt8(QFontEngineQPF::HeaderTag tag, quint8 value);
+    void writeTaggedQFixed(QFontEngineQPF::HeaderTag tag, QFixed value);
+
+    void writeUInt16(quint16 value) { value = qToBigEndian(value); dev->write((const char *)&value, sizeof(value)); }
+    void writeUInt32(quint32 value) { value = qToBigEndian(value); dev->write((const char *)&value, sizeof(value)); }
+    void writeUInt8(quint8 value) { dev->write((const char *)&value, sizeof(value)); }
+    void writeInt8(qint8 value) { dev->write((const char *)&value, sizeof(value)); }
+
+    void align4() { while (dev->pos() & 3) { dev->putChar('\0'); } }
+
+    QBuffer *dev;
+    QFontEngine *fe;
+};
+
+#endif // QT_NO_QWS_QPF2
+
+class QFontEngineMultiQWS : public QFontEngineMulti
+{
+public:
+    QFontEngineMultiQWS(QFontEngine *fe, int script, const QStringList &fallbacks);
+
+    void loadEngine(int at);
+    void draw(QPaintEngine *p, qreal x, qreal y, const QTextItemInt &si);
+
+private:
+    QStringList fallbackFamilies;
+    int script;
+};
+
+QT_END_NAMESPACE
+
+#endif // QFONTENGINE_QPF_P_H