qpf2.cpp

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#include "qpf2.h"

#include <math.h>
#include <private/qfontengine_p.h>
#include <QFile>
#include <qendian.h>
#include "../../src/gui/text/qpfutil.cpp"

int QPF::debugVerbosity = 0;

// ### copied from qfontdatabase.cpp

// 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 },
        // Khmer,
    { 80, 127 },
        // SimplifiedChinese,
    { 126, 127 },
        // TraditionalChinese,
    { 126, 127 },
        // Japanese,
    { 126, 127 },
        // Korean,
    { 56, 127 },
        // Vietnamese,
    { 0, 127 }, // same as latin1
        // Other,
    { 126, 127 }
};

#define SimplifiedChineseCsbBit 18
#define TraditionalChineseCsbBit 20
#define JapaneseCsbBit 17
#define KoreanCsbBit 21

static QList<QFontDatabase::WritingSystem> determineWritingSystemsFromTrueTypeBits(quint32 unicodeRange[4], quint32 codePageRange[2])
{
    QList<QFontDatabase::WritingSystem> writingSystems;
    bool hasScript = false;

    int i;
    for(i = 0; i < QFontDatabase::WritingSystemsCount; i++) {
        int bit = requiredUnicodeBits[i][0];
        int index = bit/32;
        int flag =  1 << (bit&31);
        if (bit != 126 && unicodeRange[index] & flag) {
            bit = requiredUnicodeBits[i][1];
            index = bit/32;

            flag =  1 << (bit&31);
            if (bit == 127 || unicodeRange[index] & flag) {
                writingSystems.append(QFontDatabase::WritingSystem(i));
                hasScript = true;
                // qDebug("font %s: index=%d, flag=%8x supports script %d", familyName.latin1(), index, flag, i);
            }
        }
    }
    if(codePageRange[0] & (1 << SimplifiedChineseCsbBit)) {
        writingSystems.append(QFontDatabase::SimplifiedChinese);
        hasScript = true;
        //qDebug("font %s supports Simplified Chinese", familyName.latin1());
    }
    if(codePageRange[0] & (1 << TraditionalChineseCsbBit)) {
        writingSystems.append(QFontDatabase::TraditionalChinese);
        hasScript = true;
        //qDebug("font %s supports Traditional Chinese", familyName.latin1());
    }
    if(codePageRange[0] & (1 << JapaneseCsbBit)) {
        writingSystems.append(QFontDatabase::Japanese);
        hasScript = true;
        //qDebug("font %s supports Japanese", familyName.latin1());
    }
    if(codePageRange[0] & (1 << KoreanCsbBit)) {
        writingSystems.append(QFontDatabase::Korean);
        hasScript = true;
        //qDebug("font %s supports Korean", familyName.latin1());
    }
    if (!hasScript)
        writingSystems.append(QFontDatabase::Symbol);

    return writingSystems;
}

static QByteArray getWritingSystems(QFontEngine *fontEngine)
{
    QByteArray os2Table = fontEngine->getSfntTable(MAKE_TAG('O', 'S', '/', '2'));
    if (os2Table.isEmpty())
        return QByteArray();

    const uchar *data = reinterpret_cast<const uchar *>(os2Table.constData());

    quint32 unicodeRange[4] = {
        qFromBigEndian<quint32>(data + 42),
        qFromBigEndian<quint32>(data + 46),
        qFromBigEndian<quint32>(data + 50),
        qFromBigEndian<quint32>(data + 54)
    };
    quint32 codePageRange[2] = { qFromBigEndian<quint32>(data + 78), qFromBigEndian<quint32>(data + 82) };
    QList<QFontDatabase::WritingSystem> systems = determineWritingSystemsFromTrueTypeBits(unicodeRange, codePageRange);

    QByteArray bitField((QFontDatabase::WritingSystemsCount + 7) / 8, 0);

    for (int i = 0; i < systems.count(); ++i) {
        int bitPos = systems.at(i);
        bitField[bitPos / 8] = bitField.at(bitPos / 8) | (1 << (bitPos % 8));
    }

    return bitField;
}

static QString stringify(const QByteArray &bits)
{
    QString result;
    for (int i = 0; i < bits.count(); ++i) {
        uchar currentByte = bits.at(i);
        for (int j = 0; j < 8; ++j) {
            if (currentByte & 1)
                result += '1';
            else
                result += '0';
            currentByte >>= 1;
        }
    }
    return result;
}

static void dumpWritingSystems(const QByteArray &bits)
{
    QStringList writingSystems;

    QString bitString = stringify(bits);
    for (int i = 0; i < qMin(int(QFontDatabase::WritingSystemsCount), bitString.length()); ++i) {
        if (bitString.at(i) == QLatin1Char('1'))
            writingSystems << QFontDatabase::writingSystemName(QFontDatabase::WritingSystem(i));
    }

    qDebug() << "Supported writing systems:" << writingSystems;
}

static const char *headerTagNames[QFontEngineQPF::NumTags] = {
    "FontName",
    "FileName",
    "FileIndex",
    "FontRevision",
    "FreeText",
    "Ascent",
    "Descent",
    "Leading",
    "XHeight",
    "AverageCharWidth",
    "MaxCharWidth",
    "LineThickness",
    "MinLeftBearing",
    "MinRightBearing",
    "UnderlinePosition",
    "GlyphFormat",
    "PixelSize",
    "Weight",
    "Style",
    "EndOfHeader",
    "WritingSystems"
};

QString QPF::fileNameForFont(const QFont &f)
{
    QString fileName = f.family().toLower() + "_" + QString::number(f.pixelSize())
                       + "_" + QString::number(f.weight())
                       + (f.italic() ? "_italic" : "")
                       + ".qpf2";
    fileName.replace(QLatin1Char(' '), QLatin1Char('_'));
    return fileName;
}

QByteArray QPF::generate(const QFont &font, int options, const QList<CharacterRange> &ranges, QString *originalFontFile)
{
    QTextEngine engine("Test", font);
    engine.itemize();
    engine.shape(0);
    QFontEngine *fontEngine = engine.fontEngine(engine.layoutData->items[0]);
    if (fontEngine->type() == QFontEngine::Multi)
        fontEngine = static_cast<QFontEngineMulti *>(fontEngine)->engine(0);

    if (originalFontFile)
        *originalFontFile = QFile::decodeName(fontEngine->faceId().filename);

    return generate(fontEngine, options, ranges);
}

QByteArray QPF::generate(QFontEngine *fontEngine, int options, const QList<CharacterRange> &ranges)
{
    QPF font;

    font.options = options;
    font.addHeader(fontEngine);
    if (options & IncludeCMap)
        font.addCMap(fontEngine);
    font.addGlyphs(fontEngine, ranges);

    return font.qpf;
}

void QPF::addHeader(QFontEngine *fontEngine)
{
    QFontEngineQPF::Header *header = reinterpret_cast<QFontEngineQPF::Header *>(addBytes(sizeof(QFontEngineQPF::Header)));

    header->magic[0] = 'Q';
    header->magic[1] = 'P';
    header->magic[2] = 'F';
    header->magic[3] = '2';
    if (options & RenderGlyphs)
        header->lock = 0xffffffff;
    else
        header->lock = 0;
    header->majorVersion = QFontEngineQPF::CurrentMajorVersion;
    header->minorVersion = QFontEngineQPF::CurrentMinorVersion;
    header->dataSize = 0;
    int oldSize = qpf.size();

    addTaggedString(QFontEngineQPF::Tag_FontName, fontEngine->fontDef.family.toUtf8());

    QFontEngine::FaceId face = fontEngine->faceId();
    addTaggedString(QFontEngineQPF::Tag_FileName, face.filename);
    addTaggedUInt32(QFontEngineQPF::Tag_FileIndex, face.index);

    {
        const QByteArray head = fontEngine->getSfntTable(MAKE_TAG('h', 'e', 'a', 'd'));
        const quint32 revision = qFromBigEndian<quint32>(reinterpret_cast<const uchar *>(head.constData()) + 4);
        addTaggedUInt32(QFontEngineQPF::Tag_FontRevision, revision);
    }

    addTaggedQFixed(QFontEngineQPF::Tag_Ascent, fontEngine->ascent());
    addTaggedQFixed(QFontEngineQPF::Tag_Descent, fontEngine->descent());
    addTaggedQFixed(QFontEngineQPF::Tag_Leading, fontEngine->leading());
    addTaggedQFixed(QFontEngineQPF::Tag_XHeight, fontEngine->xHeight());
    addTaggedQFixed(QFontEngineQPF::Tag_AverageCharWidth, fontEngine->averageCharWidth());
    addTaggedQFixed(QFontEngineQPF::Tag_MaxCharWidth, QFixed::fromReal(fontEngine->maxCharWidth()));
    addTaggedQFixed(QFontEngineQPF::Tag_LineThickness, fontEngine->lineThickness());
    addTaggedQFixed(QFontEngineQPF::Tag_MinLeftBearing, QFixed::fromReal(fontEngine->minLeftBearing()));
    addTaggedQFixed(QFontEngineQPF::Tag_MinRightBearing, QFixed::fromReal(fontEngine->minRightBearing()));
    addTaggedQFixed(QFontEngineQPF::Tag_UnderlinePosition, fontEngine->underlinePosition());
    addTaggedUInt8(QFontEngineQPF::Tag_PixelSize, fontEngine->fontDef.pixelSize);
    addTaggedUInt8(QFontEngineQPF::Tag_Weight, fontEngine->fontDef.weight);
    addTaggedUInt8(QFontEngineQPF::Tag_Style, fontEngine->fontDef.style);

    QByteArray writingSystemBitField = getWritingSystems(fontEngine);
    if (!writingSystemBitField.isEmpty())
        addTaggedString(QFontEngineQPF::Tag_WritingSystems, writingSystemBitField);

    addTaggedUInt8(QFontEngineQPF::Tag_GlyphFormat, QFontEngineQPF::AlphamapGlyphs);

    addTaggedString(QFontEngineQPF::Tag_EndOfHeader, QByteArray());
    align4();
    header = reinterpret_cast<QFontEngineQPF::Header *>(qpf.data());
    header->dataSize = qToBigEndian<quint16>(qpf.size() - oldSize);
}

static uchar *appendBytes(QByteArray &array, int size)
{
    int oldSize = array.size();
    array.resize(array.size() + size);
    return reinterpret_cast<uchar *>(array.data() + oldSize);
}

#define APPEND(type, value) \
    qToBigEndian<type>(value, appendBytes(cmap, sizeof(type)))

struct CMapSegment
{
    int start; // codepoints
    int end;
    int startGlyphIndex;
};

static QByteArray generateTrueTypeCMap(QFontEngine *fe)
{
    QByteArray cmap;
    const int glyphCount = fe->glyphCount();
    if (!glyphCount)
        return cmap;

    // cmap header
    APPEND(quint16, 0); // table version number
    APPEND(quint16, 1); // number of tables

    // encoding record
    APPEND(quint16, 3); // platform-id
    APPEND(quint16, 10); // encoding-id (ucs-4)
    const int cmapOffset = cmap.size() + sizeof(quint32);
    APPEND(quint32, cmapOffset); // offset to sub-table

    APPEND(quint16, 4); // subtable format
    const int cmapTableLengthOffset = cmap.size();
    APPEND(quint16, 0); // length in bytes, will fill in later
    APPEND(quint16, 0); // language field

    QList<CMapSegment> segments;