QFontSubset Class Reference

#include <qfontsubset_p.h>

Public Functions
int	addGlyph (int index)
QByteArray	createToUnicodeMap () const
QVector< int >	getReverseMap () const
QByteArray	glyphName (unsigned int glyph, const QVector< int > reverseMap) const
int	nGlyphs () const
	QFontSubset (QFontEngine *fe, int obj_id=0)
QByteArray	toTruetype () const
QByteArray	toType1 () const
QByteArray	type1AddedGlyphs () const
QByteArray	widthArray () const
	~QFontSubset ()

Static Public Functions
static QByteArray	glyphName (unsigned short unicode, bool symbol)

Public Variables
int	downloaded_glyphs
QFixed	emSquare
QFontEngine *	fontEngine
QList< int >	glyph_indices
bool	noEmbed
const int	object_id
bool	standard_font
QVector< QFixed >	widths

Detailed Description

Definition at line 62 of file qfontsubset_p.h.

Constructors and Destructors

QFontSubset()

QFontSubset::QFontSubset ( QFontEngine *  fe, int  obj_id = 0  )

inline

Definition at line 65 of file qfontsubset_p.h.

        : object_id(obj_id), noEmbed(false), fontEngine(fe), downloaded_glyphs(0), standard_font(false)
        { fontEngine->ref.ref(); addGlyph(0); }

~QFontSubset()

QFontSubset::~QFontSubset ( )

inline

Definition at line 68 of file qfontsubset_p.h.

                   {
        if (!fontEngine->ref.deref())
            delete fontEngine;
    }

Functions

addGlyph()

int QFontSubset::addGlyph

(

int

index

)

Definition at line 531 of file qfontsubset.cpp.

Referenced by QPdfBaseEnginePrivate::drawTextItem(), QFontSubset(), and ~QFontSubset().

{
    int idx = glyph_indices.indexOf(index);
    if (idx < 0) {
        idx = glyph_indices.size();
        glyph_indices.append(index);
    }
    return idx;
}

createToUnicodeMap()

QByteArray QFontSubset::createToUnicodeMap

(

)

const

Definition at line 439 of file qfontsubset.cpp.

Referenced by QPdfEnginePrivate::embedFont(), and ~QFontSubset().

{
    QVector<int> reverseMap = getReverseMap();

    QByteArray touc;
    QPdf::ByteStream ts(&touc);
    ts << "/CIDInit /ProcSet findresource begin\n"
        "12 dict begin\n"
        "begincmap\n"
        "/CIDSystemInfo << /Registry (Adobe) /Ordering (UCS) /Supplement 0 >> def\n"
        "/CMapName /Adobe-Identity-UCS def\n"
        "/CMapType 2 def\n"
        "1 begincodespacerange\n"
        "<0000> <FFFF>\n"
        "endcodespacerange\n";

    int nranges = 1;
    QByteArray ranges = "<0000> <0000> <0000>\n";
    QPdf::ByteStream s(&ranges);

    char buf[5];
    for (int g = 1; g < nGlyphs(); ) {
        int uc0 = reverseMap.at(g);
        if (!uc0) {
            ++g;
            continue;
        }
        int start = g;
        int startLinear = 0;
        ++g;
        while (g < nGlyphs()) {
            int uc = reverseMap[g];
            // cmaps can't have the high byte changing within one range, so we need to break on that as well
            if (!uc || (g>>8) != (start >> 8))
                break;
            if (uc == uc0 + 1) {
                if (!startLinear)
                    startLinear = g - 1;
            } else {
                if (startLinear > 0 && g - startLinear >= 10)
                    break;
                startLinear = 0;
            }
            uc0 = uc;
            ++g;
        }
        // qDebug("start=%x startLinear=%x g-1=%x",start,startLinear,g-1);
        if (g - startLinear < 10)
            startLinear = 0;
        int endnonlinear = startLinear ? startLinear : g;
        // qDebug("    startLinear=%x endnonlinear=%x", startLinear,endnonlinear);
        if (endnonlinear > start) {
            s << '<' << QPdf::toHex((ushort)start, buf) << "> <";
            s << QPdf::toHex((ushort)(endnonlinear - 1), buf) << "> ";
            if (endnonlinear == start + 1) {
                s << '<' << QPdf::toHex((ushort)reverseMap[start], buf) << ">\n";
            } else {
                s << '[';
                for (int i = start; i < endnonlinear; ++i) {
                    s << '<' << QPdf::toHex((ushort)reverseMap[i], buf) << "> ";
                }
                s << "]\n";
            }
            checkRanges(ts, ranges, nranges);
        }
        if (startLinear) {
            while (startLinear < g) {
                int len = g - startLinear;
                int uc_start = reverseMap[startLinear];
                int uc_end = uc_start + len - 1;
                if ((uc_end >> 8) != (uc_start >> 8))
                    len = 256 - (uc_start & 0xff);
                s << '<' << QPdf::toHex((ushort)startLinear, buf) << "> <";
                s << QPdf::toHex((ushort)(startLinear + len - 1), buf) << "> ";
                s << '<' << QPdf::toHex((ushort)reverseMap[startLinear], buf) << ">\n";
                checkRanges(ts, ranges, nranges);
                startLinear += len;
            }
        }
    }
    if (nranges) {
        ts << nranges << "beginbfrange\n"
           << ranges << "endbfrange\n";
    }
    ts << "endcmap\n"
        "CMapName currentdict /CMap defineresource pop\n"
        "end\n"
        "end\n";

    return touc;
}

getReverseMap()

QVector< int > QFontSubset::getReverseMap

(

)

const

Definition at line 421 of file qfontsubset.cpp.

Referenced by createToUnicodeMap(), toType1(), type1AddedGlyphs(), and ~QFontSubset().

{
    QVector<int> reverseMap;
    reverseMap.resize(0x10000);
    for (uint i = 0; i < 0x10000; ++i)
        reverseMap[i] = 0;
    QGlyphLayoutArray<10> glyphs;
    for (uint uc = 0; uc < 0x10000; ++uc) {
        QChar ch(uc);
        int nglyphs = 10;
        fontEngine->stringToCMap(&ch, 1, &glyphs, &nglyphs, QTextEngine::GlyphIndicesOnly);
        int idx = glyph_indices.indexOf(glyphs.glyphs[0]);
        if (idx >= 0 && !reverseMap.at(idx))
            reverseMap[idx] = uc;
    }
    return reverseMap;
}

glyphName() [1/2]

QByteArray QFontSubset::glyphName	(	unsigned int	glyph,
		const QVector< int >	reverseMap
	)		const

Definition at line 312 of file qfontsubset.cpp.

Referenced by type1AddedGlyphs(), and ~QFontSubset().

{
    uint glyphIndex = glyph_indices[glyph];

    if (glyphIndex == 0)
        return "/.notdef";

    QByteArray ba;
    QPdf::ByteStream s(&ba);
#ifndef QT_NO_FREETYPE
    FT_Face face = ft_face(fontEngine);

    char name[32];
    name[0] = 0;
    if (face && FT_HAS_GLYPH_NAMES(face)) {
#if defined(Q_WS_X11)
        if (fontEngine->type() == QFontEngine::XLFD)
            glyphIndex = static_cast<QFontEngineXLFD *>(fontEngine)->glyphIndexToFreetypeGlyphIndex(glyphIndex);
#endif
        FT_Get_Glyph_Name(face, glyphIndex, &name, 32);
        if (name[0] == '.') // fix broken PS fonts returning .notdef for many glyphs
            name[0] = 0;
    }
    if (name[0]) {
        s << '/' << name;
    } else
#endif
#if defined(Q_WS_X11)
    if (fontEngine->type() == QFontEngine::XLFD) {
        uint uc = static_cast<QFontEngineXLFD *>(fontEngine)->toUnicode(glyphIndex);
        s << '/' << glyphName(uc, false /* ### */);
    } else
#endif
    if (reverseMap[glyphIndex] && reverseMap[glyphIndex] < 0x10000) {
        s << '/' << glyphName(reverseMap[glyphIndex], false);
    } else {
        s << "/gl" << (int)glyphIndex;
    }
    return ba;
}

glyphName() [2/2]

QByteArray QFontSubset::glyphName ( unsigned short  unicode, bool  symbol  )

static

Definition at line 267 of file qfontsubset.cpp.

{
    if (symbol && unicode < 0x100)
        // map from latin1 to symbol
        unicode = symbol_map[unicode];

    int l = 0;
    while(unicode_to_aglindex[l].u < unicode)
        l++;
    if (unicode_to_aglindex[l].u == unicode)
        return agl + unicode_to_aglindex[l].index;

    char buffer[8];
    buffer[0] = 'u';
    buffer[1] = 'n';
    buffer[2] = 'i';
    QPdf::toHex(unicode, buffer+3);
    return buffer;
}

nGlyphs()

int QFontSubset::nGlyphs ( ) const

inline

Definition at line 90 of file qfontsubset_p.h.

Referenced by createToUnicodeMap(), generateGlyphTables(), toTruetype(), type1AddedGlyphs(), and widthArray().

{ return glyph_indices.size(); }

toTruetype()

QByteArray QFontSubset::toTruetype

(

)

const

Definition at line 1385 of file qfontsubset.cpp.

Referenced by QPdfEnginePrivate::embedFont(), and ~QFontSubset().

{
    qttf_font_tables font;
    memset(&font, 0, sizeof(qttf_font_tables));

    qreal ppem = fontEngine->fontDef.pixelSize;
#define TO_TTF(x) qRound(x * 2048. / ppem)
    QList<QTtfGlyph> glyphs;

    QFontEngine::Properties properties = fontEngine->properties();
    // initialize some stuff needed in createWidthArray
    emSquare = 2048;
    widths.resize(nGlyphs());

    // head table
    font.head.font_revision = 0x00010000;
    font.head.flags = (1 << 2) | (1 << 4);
    font.head.created = 0; // ###
    font.head.modified = 0; // ###
    font.head.xMin = SHRT_MAX;
    font.head.xMax = SHRT_MIN;
    font.head.yMin = SHRT_MAX;
    font.head.yMax = SHRT_MIN;
    font.head.macStyle = (fontEngine->fontDef.weight > QFont::Normal) ? 1 : 0;
    font.head.macStyle |= (fontEngine->fontDef.styleHint != QFont::StyleNormal) ? 1 : 0;

    // hhea table
    font.hhea.ascender = qRound(properties.ascent);
    font.hhea.descender = -qRound(properties.descent);
    font.hhea.lineGap = qRound(properties.leading);
    font.hhea.maxAdvanceWidth = TO_TTF(fontEngine->maxCharWidth());
    font.hhea.minLeftSideBearing = TO_TTF(fontEngine->minLeftBearing());
    font.hhea.minRightSideBearing = TO_TTF(fontEngine->minRightBearing());
    font.hhea.xMaxExtent = SHRT_MIN;

    font.maxp.numGlyphs = 0;
    font.maxp.maxPoints = 0;
    font.maxp.maxContours = 0;
    font.maxp.maxCompositePoints = 0;
    font.maxp.maxCompositeContours = 0;
    font.maxp.maxComponentElements = 0;
    font.maxp.maxComponentDepth = 0;
    font.maxp.numGlyphs = nGlyphs();



    uint sumAdvances = 0;
    for (int i = 0; i < nGlyphs(); ++i) {
        glyph_t g = glyph_indices.at(i);
        QPainterPath path;
        glyph_metrics_t metric;
        fontEngine->getUnscaledGlyph(g, &path, &metric);
        if (noEmbed) {
            path = QPainterPath();
            if (g == 0)
                path.addRect(QRectF(0, 0, 1000, 1000));
        }
        QTtfGlyph glyph = generateGlyph(i, path, metric.xoff.toReal(), metric.x.toReal(), properties.emSquare.toReal());

        font.head.xMin = qMin(font.head.xMin, glyph.xMin);
        font.head.xMax = qMax(font.head.xMax, glyph.xMax);
        font.head.yMin = qMin(font.head.yMin, glyph.yMin);
        font.head.yMax = qMax(font.head.yMax, glyph.yMax);

        font.hhea.xMaxExtent = qMax(font.hhea.xMaxExtent, (qint16)(glyph.lsb + glyph.xMax - glyph.xMin));

        font.maxp.maxPoints = qMax(font.maxp.maxPoints, glyph.numPoints);
        font.maxp.maxContours = qMax(font.maxp.maxContours, glyph.numContours);

        if (glyph.xMax > glyph.xMin)
            sumAdvances += glyph.xMax - glyph.xMin;

//         qDebug("adding glyph %d size=%d", glyph.index, glyph.data.size());
        glyphs.append(glyph);
        widths[i] = glyph.advanceWidth;
    }


    QList<QTtfTable> tables = generateGlyphTables(font, glyphs);
    tables.append(generateHead(font.head));
    tables.append(generateHhea(font.hhea));
    tables.append(generateMaxp(font.maxp));
    // name
    QTtfTable name_table;
    name_table.tag = MAKE_TAG('n', 'a', 'm', 'e');
    if (!noEmbed)
        name_table.data = fontEngine->getSfntTable(name_table.tag);
    if (name_table.data.isEmpty()) {
        qttf_name_table name;
        if (noEmbed)
            name.copyright = QLatin1String("Fake font");
        else
            name.copyright = QLatin1String(properties.copyright);
        name.family = fontEngine->fontDef.family;
        name.subfamily = QLatin1String("Regular"); // ######
        name.postscript_name = QLatin1String(properties.postscriptName);
        name_table = generateName(name);
    }
    tables.append(name_table);

    if (!noEmbed) {
        QTtfTable os2;
        os2.tag = MAKE_TAG('O', 'S', '/', '2');
        os2.data = fontEngine->getSfntTable(os2.tag);
        if (!os2.data.isEmpty())
            tables.append(os2);
    }

    return bindFont(tables);
}

toType1()

QByteArray QFontSubset::toType1

(

)

const

Definition at line 1648 of file qfontsubset.cpp.

Referenced by ~QFontSubset().

{
    QFontEngine::Properties properties = fontEngine->properties();
    QVector<int> reverseMap = getReverseMap();

    QByteArray font;
    QPdf::ByteStream s(&font);

    QByteArray id = QByteArray::number(object_id);
    QByteArray psname = properties.postscriptName;
    psname.replace(' ', "");

    standard_font = false;

#ifndef QT_NO_FREETYPE
    FT_Face face = ft_face(fontEngine);
    if (face && !FT_IS_SCALABLE(face)) {
        int style = 0;
        if (fontEngine->fontDef.style)
            style += 2;
        if (fontEngine->fontDef.weight >= QFont::Bold)
            style++;
        if (fontEngine->fontDef.family.contains(QLatin1String("Helvetica"))) {
            psname = helvetica_styles[style];
            standard_font = true;
        } else if (fontEngine->fontDef.family.contains(QLatin1String("Times"))) {
            psname = times_styles[style];
            standard_font = true;
        } else if (fontEngine->fontDef.family.contains(QLatin1String("Courier"))) {
            psname = courier_styles[style];
            standard_font = true;
        }
    }
#endif
    s << "/F" << id << "-Base\n";
    if (standard_font) {
            s << '/' << psname << " findfont\n"
                "0 dict copy dup /NumGlyphs 0 put dup /CMap 256 array put def\n";
    } else {
        s << "<<\n";
        if(!psname.isEmpty())
            s << "/FontName /" << psname << '\n';
        s << "/FontInfo <</FsType " << (int)fontEngine->fsType << ">>\n"
            "/FontType 1\n"
            "/PaintType 0\n"
            "/FontMatrix [.001 0 0 .001 0 0]\n"
            "/FontBBox { 0 0 0 0 }\n"
            "/Private <<\n"
            "/password 5839\n"
            "/MinFeature {16 16}\n"
            "/BlueValues []\n"
            "/lenIV -1\n"
            ">>\n"
            "/CharStrings << >>\n"
            "/NumGlyphs 0\n"
            "/CMap 256 array\n"
            ">> def\n";
    }
    s << type1AddedGlyphs();
    downloaded_glyphs = glyph_indices.size();

    return font;
}

type1AddedGlyphs()

QByteArray QFontSubset::type1AddedGlyphs

(

)

const

Definition at line 1712 of file qfontsubset.cpp.

Referenced by toType1(), and ~QFontSubset().

{
    if (downloaded_glyphs == glyph_indices.size())
        return QByteArray();

    QFontEngine::Properties properties = fontEngine->properties();
    QVector<int> reverseMap = getReverseMap();
    QByteArray glyphs;
    QPdf::ByteStream s(&glyphs);

    int nGlyphs = glyph_indices.size();
    QByteArray id = QByteArray::number(object_id);

    s << 'F' << id << "-Base [\n";
    for (int i = downloaded_glyphs; i < nGlyphs; ++i) {
        glyph_t g = glyph_indices.at(i);
        QPainterPath path;
        glyph_metrics_t metric;
        fontEngine->getUnscaledGlyph(g, &path, &metric);
        QByteArray charstring = charString(path, metric.xoff.toReal(), metric.x.toReal(),
                                             properties.emSquare.toReal());
        s << glyphName(i, reverseMap);
        if (!standard_font)
          s << "\n<" << charstring << ">\n";
    }
    s << (standard_font ? "] T1AddMapping\n" : "] T1AddGlyphs\n");
    return glyphs;
}

widthArray()

QByteArray QFontSubset::widthArray

(

)

const

Definition at line 354 of file qfontsubset.cpp.

Referenced by QPdfEnginePrivate::embedFont(), and ~QFontSubset().

{
    Q_ASSERT(!widths.isEmpty());

    QFontEngine::Properties properties = fontEngine->properties();

    QByteArray width;
    QPdf::ByteStream s(&width);
    QFixed scale = QFixed(1000)/emSquare;

    QFixed defWidth = widths[0];
    //qDebug("defWidth=%d, scale=%f", defWidth.toInt(), scale.toReal());
    for (int i = 0; i < nGlyphs(); ++i) {
        if (defWidth != widths[i])
            defWidth = 0;
    }
    if (defWidth > 0) {
        s << "/DW " << (defWidth*scale).toInt();
    } else {
        s << "/W [";
        for (int g = 0; g < nGlyphs();) {
            QFixed w = widths[g];
            int start = g;
            int startLinear = 0;
            ++g;
            while (g < nGlyphs()) {
                QFixed nw = widths[g];
                if (nw == w) {
                if (!startLinear)
                    startLinear = g - 1;
                } else {
                    if (startLinear > 0 && g - startLinear >= 10)
                        break;
                    startLinear = 0;
                }
                w = nw;
                ++g;
            }
            // qDebug("start=%x startLinear=%x g-1=%x",start,startLinear,g-1);
            if (g - startLinear < 10)
                startLinear = 0;
            int endnonlinear = startLinear ? startLinear : g;
            // qDebug("    startLinear=%x endnonlinear=%x", startLinear,endnonlinear);
            if (endnonlinear > start) {
                s << start << '[';
                for (int i = start; i < endnonlinear; ++i)
                    s << (widths[i]*scale).toInt();
                s << "]\n";
            }
            if (startLinear)
                s << startLinear << g - 1 << (widths[startLinear]*scale).toInt() << '\n';
        }
        s << "]\n";
    }
    return width;
}

Properties

downloaded_glyphs

int QFontSubset::downloaded_glyphs

mutable

Definition at line 88 of file qfontsubset_p.h.

Referenced by toType1(), and type1AddedGlyphs().

emSquare

QFixed QFontSubset::emSquare

mutable

Definition at line 91 of file qfontsubset_p.h.

Referenced by toTruetype(), and widthArray().

fontEngine

QFontEngine* QFontSubset::fontEngine

Definition at line 86 of file qfontsubset_p.h.

Referenced by QPdfEnginePrivate::embedFont(), getReverseMap(), glyphName(), QFontSubset(), toTruetype(), toType1(), type1AddedGlyphs(), widthArray(), and ~QFontSubset().

glyph_indices

QList<int> QFontSubset::glyph_indices

Definition at line 87 of file qfontsubset_p.h.

Referenced by addGlyph(), getReverseMap(), glyphName(), toTruetype(), toType1(), and type1AddedGlyphs().

noEmbed

bool QFontSubset::noEmbed

Definition at line 85 of file qfontsubset_p.h.

Referenced by QPdfBaseEnginePrivate::drawTextItem(), and toTruetype().

object_id

const int QFontSubset::object_id

Definition at line 84 of file qfontsubset_p.h.

Referenced by QPdfBaseEnginePrivate::drawTextItem(), QPdfEnginePrivate::embedFont(), toType1(), and type1AddedGlyphs().

standard_font

bool QFontSubset::standard_font

mutable

Definition at line 89 of file qfontsubset_p.h.

Referenced by toType1(), and type1AddedGlyphs().

widths

QVector<QFixed> QFontSubset::widths

mutable

Definition at line 92 of file qfontsubset_p.h.

Referenced by toTruetype(), and widthArray().

---

The documentation for this class was generated from the following files:

• /src/gui/text/qfontsubset_p.h
• /src/gui/text/qfontsubset.cpp