qfontengine_x11.cpp

奇趣公司比较新的qt/emd版本

    int right = face->glyph->metrics.horiBearingX + face->glyph->metrics.width;
    int top    = face->glyph->metrics.horiBearingY;
    int bottom = face->glyph->metrics.horiBearingY - face->glyph->metrics.height;

    QFixedPoint p;
    p.x = 0;
    p.y = 0;
    metrics->width = QFixed::fromFixed(right-left);
    metrics->height = QFixed::fromFixed(top-bottom);
    metrics->x = QFixed::fromFixed(left);
    metrics->y = QFixed::fromFixed(-top);
    metrics->xoff = QFixed::fromFixed(face->glyph->advance.x);

    if (!FT_IS_SCALABLE(freetype->face)) 
        QFreetypeFace::addBitmapToPath(face->glyph, p, path);
    else 
        QFreetypeFace::addGlyphToPath(face, face->glyph, p, path, face->units_per_EM << 6, face->units_per_EM << 6);

    FT_Set_Transform(face, &freetype->matrix, 0);
    freetype->unlock();
#endif // QT_NO_FREETYPE
}


QByteArray QFontEngineXLFD::getSfntTable(uint tag) const
{
#ifndef QT_NO_FREETYPE
    if (face_id.index == -1)
        (void)faceId();
    if (!freetype)
        return QByteArray();
    return freetype->getSfntTable(tag);
#else
    Q_UNUSED(tag);
    return QByteArray();
#endif
}

int QFontEngineXLFD::synthesized() const
{
    return synth;
}

#ifndef QT_NO_FREETYPE

FT_Face QFontEngineXLFD::non_locked_face() const
{
    return freetype ? freetype->face : 0;
}

uint QFontEngineXLFD::toUnicode(glyph_t g) const
{
    if (_codec) {
        QTextCodec::ConverterState state;
        state.flags = QTextCodec::ConvertInvalidToNull;
        uchar data[2];
        int l = 1;
        if (g > 255) {
            data[0] = (g >> 8);
            data[1] = (g & 255);
            l = 2;
        } else {
            data[0] = g;
        }
        QString s = _codec->toUnicode((char *)data, l, &state);
        Q_ASSERT(s.length() == 1);
        g = s.at(0).unicode();
    }
    return g;
}

glyph_t QFontEngineXLFD::glyphIndexToFreetypeGlyphIndex(glyph_t g) const
{
    return FT_Get_Char_Index(freetype->face, toUnicode(g));
}
#endif

#ifndef QT_NO_FONTCONFIG

// ------------------------------------------------------------------
// Multi FT engine
// ------------------------------------------------------------------

static QFontEngine *engineForPattern(FcPattern *pattern, const QFontDef &request,
                                     int screen)
{
    FcResult res;
    FcPattern *match = FcFontMatch(0, pattern, &res);
    QFontEngineX11FT *engine = new QFontEngineX11FT(match, request, screen);
    if (!engine->invalid())
        return engine;

    delete engine;
    QFontEngine *fe = new QFontEngineBox(request.pixelSize);
    fe->fontDef = request;
    return fe;
}

QFontEngineMultiFT::QFontEngineMultiFT(QFontEngine *fe, FcPattern *p, int s, const QFontDef &req)
    : QFontEngineMulti(2), request(req), pattern(p), fontSet(0), screen(s)
{

    engines[0] = fe;
    engines.at(0)->ref.ref();
    fontDef = engines[0]->fontDef;
    cache_cost = 100;
}

QFontEngineMultiFT::~QFontEngineMultiFT()
{
    FcPatternDestroy(pattern);
    if (fontSet)
        FcFontSetDestroy(fontSet);
}


void QFontEngineMultiFT::loadEngine(int at)
{
    extern void qt_addPatternProps(FcPattern *pattern, int screen, int script,
                                   const QFontDef &request);
    extern QFontDef qt_FcPatternToQFontDef(FcPattern *pattern, const QFontDef &);
    extern FcFontSet *qt_fontSetForPattern(FcPattern *pattern, const QFontDef &request);

    Q_ASSERT(at > 0);
    if (!fontSet) {
        fontSet = qt_fontSetForPattern(pattern, request);
        engines.resize(fontSet->nfont);
    }
    Q_ASSERT(at < engines.size());
    Q_ASSERT(engines.at(at) == 0);

    FcPattern *pattern = FcPatternDuplicate(fontSet->fonts[at]);
    qt_addPatternProps(pattern, screen, QUnicodeTables::Common, request);

    QFontDef fontDef = qt_FcPatternToQFontDef(pattern, this->request);

    // note: we use -1 for the script to make sure that we keep real
    // FT engines separate from Multi engines in the font cache
    QFontCache::Key key(fontDef, -1, screen);
    QFontEngine *fontEngine = QFontCache::instance->findEngine(key);
    if (!fontEngine) {
        FcConfigSubstitute(0, pattern, FcMatchPattern);
        FcDefaultSubstitute(pattern);
        fontEngine = engineForPattern(pattern, request, screen);
        FcPatternDestroy(pattern);
        QFontCache::instance->insertEngine(key, fontEngine);
    }
    fontEngine->ref.ref();
    engines[at] = fontEngine;
}

// ------------------------------------------------------------------
// X11 FT engine
// ------------------------------------------------------------------



Q_GUI_EXPORT void qt_x11ft_convert_pattern(FcPattern *pattern, QByteArray *file_name, int *index, bool *antialias)
{
    FcChar8 *fileName;
    FcPatternGetString(pattern, FC_FILE, 0, &fileName);
    *file_name = (const char *)fileName;
    if (!FcPatternGetInteger(pattern, FC_INDEX, 0, index))
        index = 0;
    FcBool b;
    if (FcPatternGetBool(pattern, FC_ANTIALIAS, 0, &b) == FcResultMatch)
        *antialias = b;
}


QFontEngineX11FT::QFontEngineX11FT(FcPattern *pattern, const QFontDef &fd, int screen)
    : QFontEngineFT(fd)
{
//     FcPatternPrint(pattern);

    bool antialias = X11->fc_antialias;
    QByteArray file_name;
    int face_index;
    qt_x11ft_convert_pattern(pattern, &file_name, &face_index, &antialias);
    QFontEngine::FaceId face_id;
    face_id.filename = file_name;
    face_id.index = face_index;

    canUploadGlyphsToServer = true;

    subpixelType = Subpixel_None;
    if (antialias) {
        int subpixel = 0;
        if (FcPatternGetInteger(pattern, FC_RGBA, 0, &subpixel) == FcResultNoMatch
            && X11->display)
            subpixel = X11->screens[screen].subpixel;
        if (!antialias || subpixel == FC_RGBA_UNKNOWN)
            subpixel = FC_RGBA_NONE;

        switch (subpixel) {
            case FC_RGBA_NONE: subpixelType = Subpixel_None; break;
            case FC_RGBA_RGB: subpixelType = Subpixel_RGB; break;
            case FC_RGBA_BGR: subpixelType = Subpixel_BGR; break;
            case FC_RGBA_VRGB: subpixelType = Subpixel_VRGB; break;
            case FC_RGBA_VBGR: subpixelType = Subpixel_VBGR; break;
            default: break;
        }
    }

#ifdef FC_HINT_STYLE
    {
        int hint_style = 0;
        if (FcPatternGetInteger (pattern, FC_HINT_STYLE, 0, &hint_style) == FcResultNoMatch)
            hint_style = X11->fc_hint_style;
        if (hint_style == FC_HINT_NONE)
            default_load_flags |= FT_LOAD_NO_HINTING;
        else if (hint_style < FC_HINT_FULL)
            default_load_flags |= FT_LOAD_TARGET_LIGHT;
    }
#endif

#if defined(FC_AUTOHINT) && defined(FT_LOAD_FORCE_AUTOHINT)
    {
        bool autohint = false;

        FcBool b;
        if (FcPatternGetBool(pattern, FC_AUTOHINT, 0, &b) == FcResultMatch)
            autohint = b;

        if (autohint)
            default_load_flags |= FT_LOAD_FORCE_AUTOHINT;
    }
#endif

    GlyphFormat defaultFormat = Format_None;

#ifndef QT_NO_XRENDER
    if (X11->use_xrender) {
        int format = PictStandardA8;
        if (!antialias)
            format = PictStandardA1;
        else if (subpixelType == Subpixel_RGB
                 || subpixelType == Subpixel_BGR
                 || subpixelType == Subpixel_VRGB
                 || subpixelType == Subpixel_VBGR)
            format = PictStandardARGB32;
        xglyph_format = format;

        if (subpixelType != QFontEngineFT::Subpixel_None)
            defaultFormat = Format_A32;
        else if (antialias)
            defaultFormat = Format_A8;
        else
            defaultFormat = Format_Mono;
    }
#endif

    if (!init(face_id, antialias, defaultFormat)) {
        FcPatternDestroy(pattern);
        return;
    }

    if (!freetype->charset) {
        FcCharSet *cs;
        FcPatternGetCharSet (pattern, FC_CHARSET, 0, &cs);
        freetype->charset = FcCharSetCopy(cs);
    }
    FcPatternDestroy(pattern);
}

QFontEngineX11FT::~QFontEngineX11FT()
{
    freeGlyphSets();
}

unsigned long QFontEngineX11FT::allocateServerGlyphSet()
{
#ifndef QT_NO_XRENDER
    if (!X11->use_xrender)
        return 0;
    return XRenderCreateGlyphSet(X11->display, XRenderFindStandardFormat(X11->display, xglyph_format));
#else
    return 0;
#endif
}

void QFontEngineX11FT::freeServerGlyphSet(unsigned long id)
{
#ifndef QT_NO_XRENDER
    if (!id)
        return;
    XRenderFreeGlyphSet(X11->display, id);
#endif
}

bool QFontEngineX11FT::uploadGlyphToServer(QGlyphSet *set, uint glyphid, Glyph *g, GlyphInfo *info, int glyphDataSize) const
{
#ifndef QT_NO_XRENDER
    if (g->format == Format_Mono) {
        /*
         * swap bit order around; FreeType is always MSBFirst
         */
        if (BitmapBitOrder(X11->display) != MSBFirst) {
            unsigned char *line = g->data;
            int i = glyphDataSize;
            while (i--) {
                unsigned char c;
                c = *line;
                c = ((c << 1) & 0xaa) | ((c >> 1) & 0x55);
                c = ((c << 2) & 0xcc) | ((c >> 2) & 0x33);
                c = ((c << 4) & 0xf0) | ((c >> 4) & 0x0f);
                *line++ = c;
            }
        }
    }

    ::Glyph xglyph = glyphid;
    XRenderAddGlyphs (X11->display, set->id, &xglyph, info, 1, (const char *)g->data, glyphDataSize);
    delete [] g->data;
    g->data = 0;
    g->format = Format_None;
    g->uploadedToServer = true;
    return true;
#else
    return false;
#endif
}

#endif // QT_NO_FONTCONFIG