qscriptengine.cpp

奇趣公司比较新的qt/emd版本

    if (item->from > 0) {
        --f;
        ++l;
        ++properties;
    }
    if (f + l < item->string->length()) {
        ++l;
    }
    qt_getArabicProperties((const unsigned short *)(uc+f), l, props.data());

    QVarLengthArray<uint> apply(item->num_glyphs);

    for (int i = 0; i < item->num_glyphs; i++) {
        apply[i] = 0;

        if (properties[i].shape == XIsolated)
            apply[i] |= MediProperty|FinaProperty|InitProperty;
        else if (properties[i].shape == XMedial)
            apply[i] |= IsolProperty|FinaProperty|InitProperty;
        else if (properties[i].shape == XFinal)
            apply[i] |= IsolProperty|MediProperty|InitProperty;
        else if (properties[i].shape == XInitial)
            apply[i] |= IsolProperty|MediProperty|FinaProperty;

        item->glyphs[i].attributes.justification = properties[i].justification;
    }

    if (!openType->shape(item, apply.data())) {
        *ot_ok = false;
        return false;
    }
    return openType->positionAndAdd(item, nglyphs);
}

#endif

#ifndef Q_WS_MAC
// #### stil missing: identify invalid character combinations
static bool arabic_shape(QShaperItem *item)
{
    Q_ASSERT(item->script == QUnicodeTables::Arabic);

#ifndef QT_NO_OPENTYPE
    QOpenType *openType = item->font->openType();

    if (openType && openType->supportsScript(QUnicodeTables::Arabic)) {
        bool ot_ok;
        if (arabicSyriacOpenTypeShape(openType, item, &ot_ok))
            return true;
        if (ot_ok)
            return false;
            // fall through to the non OT code
    }
#endif

    QVarLengthArray<ushort> shapedChars(item->length);

    int slen;
    shapedString(item->string, item->from, item->length, (QChar *)shapedChars.data(), &slen,
                  item->flags & QTextEngine::RightToLeft,
                  item->glyphs, item->log_clusters);

    if (!item->font->stringToCMap((QChar *)shapedChars.data(), slen, item->glyphs, &item->num_glyphs, QFlag(item->flags)))
        return false;

    for (int i = 0; i < slen; ++i)
        if (item->glyphs[i].attributes.mark)
            item->glyphs[i].advance = QFixedPoint();
    qt_heuristicPosition(item);
    return true;
}
#endif

// ------------------------------------------------------------------------------------------------------------------
//
// Continuation of middle eastern languages
//
// ------------------------------------------------------------------------------------------------------------------

#if defined(Q_WS_X11) || defined(Q_WS_QWS)
// #### stil missing: identify invalid character combinations
static bool syriac_shape(QShaperItem *item)
{
    Q_ASSERT(item->script == QUnicodeTables::Syriac);

#ifndef QT_NO_OPENTYPE
    QOpenType *openType = item->font->openType();
    if (openType && openType->supportsScript(QUnicodeTables::Syriac)) {
        bool ot_ok;
        if (arabicSyriacOpenTypeShape(openType, item, &ot_ok))
            return true;
        if (ot_ok)
            return false;
            // fall through to the non OT code
    }
#endif
    return basic_shape(item);
}


static bool thaana_shape(QShaperItem *item)
{
    Q_ASSERT(item->script == QUnicodeTables::Thaana);

#ifndef QT_NO_OPENTYPE
    QOpenType *openType = item->font->openType();

    if (openType && openType->supportsScript(item->script)) {
        openType->selectScript(item, QUnicodeTables::Thaana);
        const int availableGlyphs = item->num_glyphs;
        if (!item->font->stringToCMap(item->string->unicode()+item->from, item->length, item->glyphs, &item->num_glyphs, QFlag(item->flags)))
            return false;
        heuristicSetGlyphAttributes(item);
        openType->shape(item);
        return openType->positionAndAdd(item, availableGlyphs);
    }
#endif
    return basic_shape(item);
}
#endif

// --------------------------------------------------------------------------------------------------------------------------------------------
//
// Indic languages
//
// --------------------------------------------------------------------------------------------------------------------------------------------

enum Form {
    Invalid = 0x0,
    UnknownForm = Invalid,
    Consonant,
    Nukta,
    Halant,
    Matra,
    VowelMark,
    StressMark,
    IndependentVowel,
    LengthMark,
    Control,
    Other
};

static const unsigned char indicForms[0xe00-0x900] = {
    // Devangari
    Invalid, VowelMark, VowelMark, VowelMark,
    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,

    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, UnknownForm, UnknownForm,
    Nukta, Other, Matra, Matra,

    Matra, Matra, Matra, Matra,
    Matra, Matra, Matra, Matra,
    Matra, Matra, Matra, Matra,
    Matra, Halant, UnknownForm, UnknownForm,

    Other, StressMark, StressMark, StressMark,
    StressMark, UnknownForm, UnknownForm, UnknownForm,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    IndependentVowel, IndependentVowel, VowelMark, VowelMark,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Consonant,
    Consonant, Consonant /* ??? */, Consonant, Consonant,

    // Bengali
    Invalid, VowelMark, VowelMark, VowelMark,
    Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, Invalid, Invalid, IndependentVowel,

    IndependentVowel, Invalid, Invalid, IndependentVowel,
    IndependentVowel, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Invalid, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Invalid, Consonant, Invalid,
    Invalid, Invalid, Consonant, Consonant,
    Consonant, Consonant, UnknownForm, UnknownForm,
    Nukta, Other, Matra, Matra,

    Matra, Matra, Matra, Matra,
    Matra, Invalid, Invalid, Matra,
    Matra, Invalid, Invalid, Matra,
    Matra, Halant, Consonant, UnknownForm,

    Invalid, Invalid, Invalid, Invalid,
    Invalid, Invalid, Invalid, VowelMark,
    Invalid, Invalid, Invalid, Invalid,
    Consonant, Consonant, Invalid, Consonant,

    IndependentVowel, IndependentVowel, VowelMark, VowelMark,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    Consonant, Consonant, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    // Gurmukhi
    Invalid, VowelMark, VowelMark, VowelMark,
    Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, Invalid,
    Invalid, Invalid, Invalid, IndependentVowel,

    IndependentVowel, Invalid, Invalid, IndependentVowel,
    IndependentVowel, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Invalid, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Invalid, Consonant, Consonant,
    Invalid, Consonant, Consonant, Invalid,
    Consonant, Consonant, UnknownForm, UnknownForm,
    Nukta, Other, Matra, Matra,

    Matra, Matra, Matra, Invalid,
    Invalid, Invalid, Invalid, Matra,
    Matra, Invalid, Invalid, Matra,
    Matra, Halant, UnknownForm, UnknownForm,

    Invalid, Invalid, Invalid, Invalid,
    Invalid, UnknownForm, UnknownForm, UnknownForm,
    Invalid, Consonant, Consonant, Consonant,
    Consonant, Invalid, Consonant, Invalid,

    Other, Other, Invalid, Invalid,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    StressMark, StressMark, Consonant, Consonant,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    // Gujarati
    Invalid, VowelMark, VowelMark, VowelMark,
    Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, Invalid, IndependentVowel,

    IndependentVowel, IndependentVowel, Invalid, IndependentVowel,
    IndependentVowel, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Invalid, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Invalid, Consonant, Consonant,
    Invalid, Consonant, Consonant, Consonant,
    Consonant, Consonant, UnknownForm, UnknownForm,
    Nukta, Other, Matra, Matra,

    Matra, Matra, Matra, Matra,
    Matra, Matra, Invalid, Matra,
    Matra, Matra, Invalid, Matra,
    Matra, Halant, UnknownForm, UnknownForm,

    Other, UnknownForm, UnknownForm, UnknownForm,
    UnknownForm, UnknownForm, UnknownForm, UnknownForm,
    UnknownForm, UnknownForm, UnknownForm, UnknownForm,
    UnknownForm, UnknownForm, UnknownForm, UnknownForm,

    IndependentVowel, IndependentVowel, VowelMark, VowelMark,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    // Oriya
    Invalid, VowelMark, VowelMark, VowelMark,
    Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, Invalid, Invalid, IndependentVowel,

    IndependentVowel, Invalid, Invalid, IndependentVowel,
    IndependentVowel, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Invalid, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,

    Consonant, Invalid, Consonant, Consonant,
    Invalid, Consonant, Consonant, Consonant,
    Consonant, Consonant, UnknownForm, UnknownForm,
    Nukta, Other, Matra, Matra,

    Matra, Matra, Matra, Matra,
    Invalid, Invalid, Invalid, Matra,
    Matra, Invalid, Invalid, Matra,
    Matra, Halant, UnknownForm, UnknownForm,

    Other, Invalid, Invalid, Invalid,
    Invalid, UnknownForm, LengthMark, LengthMark,
    Invalid, Invalid, Invalid, Invalid,
    Consonant, Consonant, Invalid, Consonant,

    IndependentVowel, IndependentVowel, Invalid, Invalid,
    Invalid, Invalid, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    Other, Consonant, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,
    Other, Other, Other, Other,

    //Tamil
    Invalid, Invalid, VowelMark, Other,
    Invalid, IndependentVowel, IndependentVowel, IndependentVowel,
    IndependentVowel, IndependentVowel, IndependentVowel, Invalid,
    Invalid, Invalid, IndependentVowel, IndependentVowel,

    IndependentVowel, Invalid, IndependentVowel, IndependentVowel,
    IndependentVowel, Consonant, Invalid, Invalid,
    Invalid, Consonant, Consonant, Invalid,
    Consonant, Invalid, Consonant, Consonant,

    Invalid, Invalid, Invalid, Consonant,
    Consonant, Invalid, Invalid, Invalid,
    Consonant, Consonant, Consonant, Invalid,
    Invalid, Invalid, Consonant, Consonant,

    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, Consonant, Consonant,
    Consonant, Consonant, UnknownForm, UnknownForm,
    Invalid, Invalid, Matra, Matra,

    Matra, Matra, Matra, Invalid,
    Invalid, Invalid, Matra, Matra,
    Matra, Invalid, Matra, Matra,
    Matra, Halant, Invalid, Invalid,

    Invalid, Invalid, Invalid, Invalid,
    Invalid, Invalid, Invalid, LengthMark,
    Invalid, Invalid, Invalid, Invalid,
    Inva