qfontengine_ft.cpp

奇趣公司比较新的qt/emd版本

        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);
    unlockFace();
}

static inline unsigned int getChar(const QChar *str, int &i, const int len)
{
    unsigned int uc = str[i].unicode();
    if (uc >= 0xd800 && uc < 0xdc00 && i < len-1) {
        uint low = str[i+1].unicode();
       if (low >= 0xdc00 && low < 0xe000) {
            uc = (uc - 0xd800)*0x400 + (low - 0xdc00) + 0x10000;
            ++i;
        }
    }
    return uc;
}

bool QFontEngineFT::canRender(const QChar *string, int len)
{
    FT_Face face = freetype->face;
#if 0
    if (_cmap != -1) {
        lockFace();
        for ( int i = 0; i < len; i++ ) {
            unsigned int uc = getChar(string, i, len);
            if (!FcCharSetHasChar (_font->charset, uc) && getAdobeCharIndex(face, _cmap, uc) == 0) {
                allExist = false;
                break;
            }
        }
        unlockFace();
    } else
#endif
    {
        for ( int i = 0; i < len; i++ ) {
            unsigned int uc = getChar(string, i, len);
            if (!FT_Get_Char_Index(face, uc))
                    return false;
        }
    }
    return true;
}

void QFontEngineFT::addOutlineToPath(qreal x, qreal y, const QGlyphLayout *glyphs, int numGlyphs, QPainterPath *path, QTextItem::RenderFlags flags)
{
    if (FT_IS_SCALABLE(freetype->face)) {
        QFontEngine::addOutlineToPath(x, y, glyphs, numGlyphs, path, flags);
    } else {
        addBitmapFontToPath(x, y, glyphs, numGlyphs, path, flags);
    }
}

void QFontEngineFT::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int numGlyphs,
                                    QPainterPath *path, QTextItem::RenderFlags)
{
    FT_Face face = lockFace(Unscaled);

    for (int gl = 0; gl < numGlyphs; gl++) {
        FT_UInt glyph = glyphs[gl];

        FT_Load_Glyph(face, glyph, FT_LOAD_NO_BITMAP);

        FT_GlyphSlot g = face->glyph;
        if (g->format != FT_GLYPH_FORMAT_OUTLINE)
            continue;
        QFreetypeFace::addGlyphToPath(face, g, positions[gl], path, xsize, ysize);
    }
    unlockFace();
}

bool QFontEngineFT::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs,
                                 QTextEngine::ShaperFlags flags) const
{
    if (*nglyphs < len) {
        *nglyphs = len;
        return false;
    }

    bool mirrored = flags & QTextEngine::RightToLeft;
    int glyph_pos = 0;
    if (freetype->symbol_map) {
        FT_Face face = freetype->face;
        for ( int i = 0; i < len; ++i ) {
            unsigned int uc = getChar(str, i, len);
            if (mirrored)
                uc = QChar::mirroredChar(uc);
            glyphs[glyph_pos].glyph = uc < QFreetypeFace::cmapCacheSize ? freetype->cmapCache[uc] : 0;
            if ( !glyphs[glyph_pos].glyph ) {
                glyph_t glyph;
#if !defined(QT_NO_FONTCONFIG)
                if (FcCharSetHasChar(freetype->charset, uc)) {
#else
                if (false) {
#endif
                redo0:
                    glyph = FT_Get_Char_Index(face, uc);
                    if (!glyph && (uc == 0xa0 || uc == 0x9)) {
                        uc = 0x20;
                        goto redo0;
                    }
                } else {
                    FT_Set_Charmap(face, freetype->symbol_map);
                    glyph = FT_Get_Char_Index(face, uc);
                    FT_Set_Charmap(face, freetype->unicode_map);
                }
                glyphs[glyph_pos].glyph = glyph;
                if (uc < QFreetypeFace::cmapCacheSize)
                    freetype->cmapCache[uc] = glyph;
            }
            ++glyph_pos;
        }
    } else {
        FT_Face face = freetype->face;
        for (int i = 0; i < len; ++i) {
            unsigned int uc = getChar(str, i, len);
            if (mirrored)
                uc = QChar::mirroredChar(uc);
            glyphs[glyph_pos].glyph = uc < QFreetypeFace::cmapCacheSize ? freetype->cmapCache[uc] : 0;
            if (!glyphs[glyph_pos].glyph
#if !defined(QT_NO_FONTCONFIG)
                && FcCharSetHasChar(freetype->charset, uc)
#endif
                ) {
            redo:
                glyph_t glyph = FT_Get_Char_Index(face, uc);
                if (!glyph && (uc == 0xa0 || uc == 0x9)) {
                    uc = 0x20;
                    goto redo;
                }
                glyphs[glyph_pos].glyph = glyph;
                if (uc < QFreetypeFace::cmapCacheSize)
                    freetype->cmapCache[uc] = glyph;
            }
            ++glyph_pos;
        }
    }

    *nglyphs = glyph_pos;

    if (flags & QTextEngine::GlyphIndicesOnly)
        return true;

    recalcAdvances(*nglyphs, glyphs, flags);

    return true;
}

void QFontEngineFT::recalcAdvances(int len, QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const
{
    FT_Face face = 0;
    if (flags & QTextEngine::DesignMetrics) {
        for (int i = 0; i < len; i++) {
            Glyph *g = defaultGlyphSet.glyph_data.value(glyphs[i].glyph);
            if (g) {
                glyphs[i].advance.x = QFixed::fromFixed(g->linearAdvance);
            } else {
                if (!face)
                    face = lockFace();
                g = loadGlyph(glyphs[i].glyph);
                glyphs[i].advance.x = QFixed::fromFixed(face->glyph->linearHoriAdvance >> 10);
            }
            glyphs[i].advance.y = 0;
        }
    } else {
        for (int i = 0; i < len; i++) {
            Glyph *g = defaultGlyphSet.glyph_data.value(glyphs[i].glyph);
            if (g) {
                glyphs[i].advance.x = QFixed(g->advance);
            } else {
                if (!face)
                    face = lockFace();
                g = loadGlyph(glyphs[i].glyph);
                glyphs[i].advance.x = QFixed::fromFixed(face->glyph->metrics.horiAdvance);
            }
            glyphs[i].advance.y = 0;
        }
    }
    if (face)
        unlockFace();
}

glyph_metrics_t QFontEngineFT::boundingBox(const QGlyphLayout *glyphs, int numGlyphs)
{

    FT_Face face = 0;

    glyph_metrics_t overall;
    // initialize with line height, we get the same behaviour on all platforms
    overall.y = -ascent();
    overall.height = ascent() + descent() + 1;

    QFixed ymax = 0;
    QFixed xmax = 0;
    for (int i = 0; i < numGlyphs; i++) {
        Glyph *g = defaultGlyphSet.glyph_data.value(glyphs[i].glyph);
        if (!g) {
            if (!face)
                face = lockFace();
            g = loadGlyph(glyphs[i].glyph);
        }
        if (g) {
            QFixed x = overall.xoff + glyphs[i].offset.x + g->x;
            QFixed y = overall.yoff + glyphs[i].offset.y - g->y;
            overall.x = qMin(overall.x, x);
            overall.y = qMin(overall.y, y);
            xmax = qMax(xmax, x + g->width);
            ymax = qMax(ymax, y + g->height);
            overall.xoff += qRound(g->advance);
        } else {
            int left  = FLOOR(face->glyph->metrics.horiBearingX);
            int right = CEIL(face->glyph->metrics.horiBearingX + face->glyph->metrics.width);
            int top    = CEIL(face->glyph->metrics.horiBearingY);
            int bottom = FLOOR(face->glyph->metrics.horiBearingY - face->glyph->metrics.height);

            QFixed x = overall.xoff + glyphs[i].offset.x - (-TRUNC(left));
            QFixed y = overall.yoff + glyphs[i].offset.y - TRUNC(top);
            overall.x = qMin(overall.x, x);
            overall.y = qMin(overall.y, y);
            xmax = qMax(xmax, x + TRUNC(right - left));
            ymax = qMax(ymax, y + TRUNC(top - bottom));
            overall.xoff += qRound(TRUNC(ROUND(face->glyph->advance.x)));
        }
    }
    overall.height = qMax(overall.height, ymax - overall.y);
    overall.width = xmax - overall.x;

    if (face)
        unlockFace();

    return overall;
}

glyph_metrics_t QFontEngineFT::boundingBox(glyph_t glyph)
{
    FT_Face face = 0;
    glyph_metrics_t overall;
    Glyph *g = defaultGlyphSet.glyph_data.value(glyph);
    if (!g) {
        face = lockFace();
        g = loadGlyph(glyph);
    }
    if (g) {
        overall.x = g->x;
        overall.y = -g->y;
        overall.width = g->width;
        overall.height = g->height;
        overall.xoff = g->advance;
    } else {
        int left  = FLOOR(face->glyph->metrics.horiBearingX);
        int right = CEIL(face->glyph->metrics.horiBearingX + face->glyph->metrics.width);
        int top    = CEIL(face->glyph->metrics.horiBearingY);
        int bottom = FLOOR(face->glyph->metrics.horiBearingY - face->glyph->metrics.height);

        overall.width = TRUNC(right-left);
        overall.height = TRUNC(top-bottom);
        overall.x = TRUNC(left);
        overall.y = -TRUNC(top);
        overall.xoff = TRUNC(ROUND(face->glyph->advance.x));
    }
    if (face)
        unlockFace();
    return overall;
}

QImage QFontEngineFT::alphaMapForGlyph(glyph_t g)
{
    lockFace();

    GlyphFormat glyph_format = antialias ? Format_A8 : Format_Mono;

    Glyph *glyph = loadGlyph(g, glyph_format);
    if (!glyph) {
        unlockFace();
        return QFontEngine::alphaMapForGlyph(g);
    }

    const int pitch = antialias ? (glyph->width + 3) & ~3 : ((glyph->width + 31)/32) * 4;

    QImage img(glyph->width, glyph->height, antialias ? QImage::Format_Indexed8 : QImage::Format_Mono);
    if (antialias) {
        QVector<QRgb> colors(256);
        for (int i=0; i<256; ++i)
            colors[i] = qRgba(0, 0, 0, i);
        img.setColorTable(colors);
    } else {
        QVector<QRgb> colors(2);
        colors[0] = qRgba(0, 0, 0, 0);
        colors[1] = qRgba(0, 0, 0, 255);
        img.setColorTable(colors);
    }
    Q_ASSERT(img.bytesPerLine() == pitch);
    if (glyph->width) {
        for (int y = 0; y < glyph->height; ++y)
            memcpy(img.scanLine(y), &glyph->data[y * pitch], pitch);
    }
    unlockFace();

    return img;
}

void QFontEngineFT::removeGlyphFromCache(glyph_t glyph)
{
    delete defaultGlyphSet.glyph_data.take(glyph);
}

int QFontEngineFT::glyphCount() const
{
    int count = 0;
    FT_Face face = lockFace();
    if (face) {
        count = face->num_glyphs;
        unlockFace();
    }
    return count;
}

FT_Face QFontEngineFT::lockFace(Scaling scale) const
{
    freetype->lock();
    FT_Face face = freetype->face;
    if (scale == Unscaled) {
        FT_Set_Char_Size(face, face->units_per_EM << 6, face->units_per_EM << 6, 0, 0);
        freetype->xsize = face->units_per_EM << 6;
        freetype->ysize = face->units_per_EM << 6;
    } else if (freetype->xsize != xsize || freetype->ysize != ysize) {
        FT_Set_Char_Size(face, xsize, ysize, 0, 0);
        freetype->xsize = xsize;
        freetype->ysize = ysize;
    }
    if (freetype->matrix.xx != matrix.xx ||
        freetype->matrix.yy != matrix.yy ||
        freetype->matrix.xy != matrix.xy ||
        freetype->matrix.yx != matrix.yx) {
        freetype->matrix = matrix;
        FT_Set_Transform(face, &freetype->matrix, 0);
    }

    return face;
}

void QFontEngineFT::unlockFace() const
{
    freetype->unlock();
}

FT_Face QFontEngineFT::non_locked_face() const
{
    return freetype->face;
}


QFontEngineFT::QGlyphSet::QGlyphSet()
    : id(0)
{
    transformationMatrix.xx = 0x10000;
    transformationMatrix.yy = 0x10000;
    transformationMatrix.xy = 0;
    transformationMatrix.yx = 0;
}

QFontEngineFT::QGlyphSet::~QGlyphSet()
{
    qDeleteAll(glyph_data);
}

unsigned long QFontEngineFT::allocateServerGlyphSet()
{
    return 0;
}

void QFontEngineFT::freeServerGlyphSet(unsigned long id)
{
    Q_UNUSED(id);
}

#endif // QT_NO_FREETYPE