/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtGui module of the Qt Toolkit.

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** 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 Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** 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

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**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

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** $QT_END_LICENSE$

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****************************************************************************/

#include <qdir.h>

#include "qfontdatabase.h"

#include "qdebug.h"

#include "qalgorithms.h"

#include "qapplication.h"

#include "qvarlengtharray.h" // here or earlier - workaround for VC++6

#include "qthread.h"

#include "qmutex.h"

#include "private/qunicodetables_p.h"

#include "qfontengine_p.h"

#ifdef Q_WS_X11

#include <locale.h>

#endif

#include <stdlib.h>

#include <limits.h>

#if (defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)) && !defined(QT_NO_FREETYPE)

#  include <ft2build.h>

#  include FT_TRUETYPE_TABLES_H

#endif

// #define QFONTDATABASE_DEBUG

#ifdef QFONTDATABASE_DEBUG

#  define FD_DEBUG qDebug

#else

#  define FD_DEBUG if (false) qDebug

#endif

// #define FONT_MATCH_DEBUG

#ifdef FONT_MATCH_DEBUG

#  define FM_DEBUG qDebug

#else

#  define FM_DEBUG if (false) qDebug

#endif

#if defined(Q_CC_MSVC) && !defined(Q_CC_MSVC_NET)

#  define for if(0){}else for

#endif

QT_BEGIN_NAMESPACE

#define SMOOTH_SCALABLE 0xffff

Q_GUI_EXPORT extern int qt_defaultDpiY(); // in qfont.cpp

bool qt_enable_test_font = false;

Q_AUTOTEST_EXPORT void qt_setQtEnableTestFont(bool value)

{

    qt_enable_test_font = value;

}

static int getFontWeight(const QString &weightString)

{

    QString s = weightString.toLower();

    // Test in decreasing order of commonness

    if (s == QLatin1String("medium") ||

        s == QLatin1String("normal")

        || s.compare(QApplication::translate("QFontDatabase", "Normal"), Qt::CaseInsensitive) == 0)

        return QFont::Normal;

    if (s == QLatin1String("bold")

        || s.compare(QApplication::translate("QFontDatabase", "Bold"), Qt::CaseInsensitive) == 0)

        return QFont::Bold;

    if (s == QLatin1String("demibold") || s == QLatin1String("demi bold")

        || s.compare(QApplication::translate("QFontDatabase", "Demi Bold"), Qt::CaseInsensitive) == 0)

        return QFont::DemiBold;

    if (s == QLatin1String("black")

        || s.compare(QApplication::translate("QFontDatabase", "Black"), Qt::CaseInsensitive) == 0)

        return QFont::Black;

    if (s == QLatin1String("light"))

        return QFont::Light;

    if (s.contains(QLatin1String("bold"))

        || s.contains(QApplication::translate("QFontDatabase", "Bold"), Qt::CaseInsensitive)) {

        if (s.contains(QLatin1String("demi"))

            || s.compare(QApplication::translate("QFontDatabase", "Demi"), Qt::CaseInsensitive) == 0)

            return (int) QFont::DemiBold;

        return (int) QFont::Bold;

    }

    if (s.contains(QLatin1String("light"))

        || s.compare(QApplication::translate("QFontDatabase", "Light"), Qt::CaseInsensitive) == 0)

        return (int) QFont::Light;

    if (s.contains(QLatin1String("black"))

        || s.compare(QApplication::translate("QFontDatabase", "Black"), Qt::CaseInsensitive) == 0)

        return (int) QFont::Black;

    return (int) QFont::Normal;

}

struct QtFontEncoding

{

    signed int encoding : 16;

    uint xpoint   : 16;

    uint xres     : 8;

    uint yres     : 8;

    uint avgwidth : 16;

    uchar pitch   : 8;

};

struct QtFontSize

{

#ifdef Q_WS_X11

    QtFontEncoding *encodings;

    QtFontEncoding *encodingID(int id, uint xpoint = 0, uint xres = 0,

                                uint yres = 0, uint avgwidth = 0, bool add = false);

#endif // Q_WS_X11

#if defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)

    QByteArray fileName;

    int fileIndex;

#endif // defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)

};

#ifdef Q_WS_X11

QtFontEncoding *QtFontSize::encodingID(int id, uint xpoint, uint xres,

                                        uint yres, uint avgwidth, bool add)

{

    // we don't match using the xpoint, xres and yres parameters, only the id

    for (int i = 0; i < count; ++i) {

        if (encodings[i].encoding == id)

            return encodings + i;

    }

    if (!add) return 0;

    if (!(count % 4)) {

        QtFontEncoding *newEncodings = (QtFontEncoding *)

                    realloc(encodings,

                             (((count+4) >> 2) << 2) * sizeof(QtFontEncoding));

        Q_CHECK_PTR(newEncodings);

        encodings = newEncodings;

    }

    encodings[count].encoding = id;

    encodings[count].xpoint = xpoint;

    encodings[count].xres = xres;

    encodings[count].yres = yres;

    encodings[count].avgwidth = avgwidth;

    encodings[count].pitch = '*';

    return encodings + count++;

}

#endif // Q_WS_X11

struct QtFontStyle

{

    struct Key {

        Key(const QString &styleString);

        Key() : style(QFont::StyleNormal),

                weight(QFont::Normal), stretch(0) { }

        Key(const Key &o) : style(o.style),

                              weight(o.weight), stretch(o.stretch) { }

        uint style : 2;

        signed int  weight : 8;

        signed int stretch : 12;

        bool operator==(const Key & other) {

            return (style == other.style &&

                     weight == other.weight &&

                     (stretch == 0 || other.stretch == 0 || stretch == other.stretch));

        }

        bool operator!=(const Key &other) {

            return !operator==(other);

        }

        bool operator <(const Key &o) {

            int x = (style << 12) + (weight << 14) + stretch;

            int y = (o.style << 12) + (o.weight << 14) + o.stretch;

            return (x < y);

        }

    };

    QtFontStyle(const Key &k)

        : key(k), bitmapScalable(false), smoothScalable(false),

          count(0), pixelSizes(0)

    {

#if defined(Q_WS_X11)

        weightName = setwidthName = 0;

#endif // Q_WS_X11

    }

    ~QtFontStyle() {

#ifdef Q_WS_X11

        delete [] weightName;

        delete [] setwidthName;

#endif

#if defined(Q_WS_X11) || defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)

        while (count) {

            // bitfield count-- in while condition does not work correctly in mwccsym2

            count--;

#ifdef Q_WS_X11

            free(pixelSizes[count].encodings);

#endif

#if defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)

            pixelSizes[count].fileName.~QByteArray();

#endif

        }

#endif

        free(pixelSizes);

    }

    Key key;

    bool bitmapScalable : 1;

    bool smoothScalable : 1;

    signed int count    : 30;

    QtFontSize *pixelSizes;

#ifdef Q_WS_X11

    const char *weightName;

    const char *setwidthName;

#endif // Q_WS_X11

#if defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)

    bool antialiased;

#endif

    QtFontSize *pixelSize(unsigned short size, bool = false);

};

QtFontStyle::Key::Key(const QString &styleString)

    : style(QFont::StyleNormal), weight(QFont::Normal), stretch(0)

{

    weight = getFontWeight(styleString);

    if (styleString.contains(QLatin1String("Italic"))

        || styleString.contains(QApplication::translate("QFontDatabase", "Italic")))

        style = QFont::StyleItalic;

    else if (styleString.contains(QLatin1String("Oblique"))

             || styleString.contains(QApplication::translate("QFontDatabase", "Oblique")))

        style = QFont::StyleOblique;

}

QtFontSize *QtFontStyle::pixelSize(unsigned short size, bool add)

{

    for (int i = 0; i < count; i++) {

        if (pixelSizes[i].pixelSize == size)

            return pixelSizes + i;

    }

    if (!add)

        return 0;

        QtFontSize *newPixelSizes = (QtFontSize *)

                     realloc(pixelSizes,

                              (((count+8) >> 3) << 3) * sizeof(QtFontSize));

        Q_CHECK_PTR(newPixelSizes);

        pixelSizes = newPixelSizes;

    }

    pixelSizes[count].pixelSize = size;

#ifdef Q_WS_X11

    pixelSizes[count].count = 0;

    pixelSizes[count].encodings = 0;

#endif

#if defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)

    new (&pixelSizes[count].fileName) QByteArray;

    pixelSizes[count].fileIndex = 0;

#endif

    return pixelSizes + (count++);

}

struct QtFontFoundry

{

    QtFontFoundry(const QString &n) : name(n), count(0), styles(0) {}

    ~QtFontFoundry() {

        while (count--)

            delete styles[count];

        free(styles);

    }

    QString name;

    int count;

    QtFontStyle **styles;

    QtFontStyle *style(const QtFontStyle::Key &, bool = false);

};

QtFontStyle *QtFontFoundry::style(const QtFontStyle::Key &key, bool create)

{

    int pos = 0;

    if (count) {

        int low = 0;

        int high = count;

        pos = count / 2;

        while (high > low) {

            if (styles[pos]->key == key)

                return styles[pos];

            if (styles[pos]->key < key)

                low = pos + 1;

            else

                high = pos;

            pos = (high + low) / 2;

        }

        pos = low;

    }

    if (!create)

        return 0;

//     qDebug("adding key (weight=%d, style=%d, oblique=%d stretch=%d) at %d", key.weight, key.style, key.oblique, key.stretch, pos);

    if (!(count % 8)) {

        QtFontStyle **newStyles = (QtFontStyle **)

                 realloc(styles, (((count+8) >> 3) << 3) * sizeof(QtFontStyle *));

        Q_CHECK_PTR(newStyles);

        styles = newStyles;

    }

    QtFontStyle *style = new QtFontStyle(key);

    memmove(styles + pos + 1, styles + pos, (count-pos)*sizeof(QtFontStyle *));

    styles[pos] = style;

    count++;

    return styles[pos];

}

struct QtFontFamily

{

    enum WritingSystemStatus {

        Unknown         = 0,

        Supported       = 1,

        UnsupportedFT  = 2,

        UnsupportedXLFD = 4,

        Unsupported     = UnsupportedFT | UnsupportedXLFD

    };

    QtFontFamily(const QString &n)

        :

#ifdef Q_WS_X11

        fixedPitch(true), ftWritingSystemCheck(false),

        xlfdLoaded(false), synthetic(false), symbol_checked(false),

#else

        fixedPitch(false),

#endif

#ifdef Q_WS_WIN

        writingSystemCheck(false),

        loaded(false),

#endif

#if !defined(QWS) && defined(Q_OS_MAC)

        fixedPitchComputed(false),

#endif

        name(n), count(0), foundries(0)

#if defined(Q_WS_QWS) ||   defined(Q_OS_SYMBIAN) && !defined(QT_NO_FREETYPE)

        , bogusWritingSystems(false)

#endif

    {

        memset(writingSystems, 0, sizeof(writingSystems));

    }

    ~QtFontFamily() {

        while (count--)

            delete foundries[count];

        free(foundries);

    }

    bool fixedPitch : 1;

#ifdef Q_WS_X11

    bool ftWritingSystemCheck : 1;

    bool xlfdLoaded : 1;

    bool synthetic : 1;

#endif

#ifdef Q_WS_WIN

    bool writingSystemCheck : 1;

    bool loaded : 1;

#endif

#if !defined(QWS) && defined(Q_OS_MAC)

    bool fixedPitchComputed : 1;

#endif

#ifdef Q_WS_X11

#endif

    QString name;

#if defined(Q_WS_X11) ||   defined(Q_OS_SYMBIAN) && !defined(QT_NO_FREETYPE)

    QByteArray fontFilename;

    int fontFileIndex;

#endif

#ifdef Q_WS_WIN

    QString english_name;

#endif

    int count;

    QtFontFoundry **foundries;

#if defined(Q_WS_QWS) ||   defined(Q_OS_SYMBIAN) && !defined(QT_NO_FREETYPE)

    bool bogusWritingSystems;

    QStringList fallbackFamilies;

#endif

    unsigned char writingSystems[QFontDatabase::WritingSystemsCount];

    QtFontFoundry *foundry(const QString &f, bool = false);

};

#if !defined(QWS) && defined(Q_OS_MAC)

inline static void qt_mac_get_fixed_pitch(QtFontFamily *f)

{

    if(f && !f->fixedPitchComputed) {

        QFontMetrics fm(f->name);

        f->fixedPitch = fm.width(QLatin1Char('i')) == fm.width(QLatin1Char('m'));

        f->fixedPitchComputed = true;

    }

}

#endif

QtFontFoundry *QtFontFamily::foundry(const QString &f, bool create)

{

    if (f.isNull() && count == 1)

        return foundries[0];

    for (int i = 0; i < count; i++) {

        if (foundries[i]->name.compare(f, Qt::CaseInsensitive) == 0)

            return foundries[i];

    }

    if (!create)

        return 0;

    if (!(count % 8)) {

        QtFontFoundry **newFoundries = (QtFontFoundry **)

                    realloc(foundries,

                             (((count+8) >> 3) << 3) * sizeof(QtFontFoundry *));

        Q_CHECK_PTR(newFoundries);

        foundries = newFoundries;

    }

    foundries[count] = new QtFontFoundry(f);

    return foundries[count++];

}

// ### copied to tools/makeqpf/qpf2.cpp

#if (defined(Q_WS_QWS) && !defined(QT_NO_FREETYPE)) || defined(Q_WS_WIN)  || defined(Q_OS_SYMBIAN) || (defined(Q_WS_MAC) && !defined(QT_MAC_USE_COCOA))

// see the Unicode subset bitfields in the MSDN docs

static int requiredUnicodeBits[QFontDatabase::WritingSystemsCount][2] = {

        // Any,

    { 127, 127 },

        // Latin,

    { 0, 127 },

        // Greek,

    { 7, 127 },

        // Cyrillic,

    { 9, 127 },

        // Armenian,

    { 10, 127 },

        // Hebrew,

    { 11, 127 },

        // Arabic,

    { 13, 127 },

        // Syriac,

    { 71, 127 },

    //Thaana,

    { 72, 127 },

    //Devanagari,

    { 15, 127 },

    //Bengali,

    { 16, 127 },

    //Gurmukhi,

    { 17, 127 },

    //Gujarati,

    { 18, 127 },

    //Oriya,

    { 19, 127 },

    //Tamil,

    { 20, 127 },

    //Telugu,

    { 21, 127 },

    //Kannada,

    { 22, 127 },

    //Malayalam,

    { 23, 127 },

    //Sinhala,

    { 73, 127 },

    //Thai,

    { 24, 127 },

    //Lao,

    { 25, 127 },

    //Tibetan,

    { 70, 127 },

    //Myanmar,

    { 74, 127 },

        // Georgian,

    { 26, 127 },