qsvghandler.cpp

奇趣公司比较新的qt/emd版本

                font.setPointSizeF(len);
        }
        if (!style.isEmpty()) {
            if (style == QLatin1String("normal")) {
                font.setStyle(QFont::StyleNormal);
            } else if (style == QLatin1String("italic")) {
                font.setStyle(QFont::StyleItalic);
            } else if (style == QLatin1String("oblique")) {
                font.setStyle(QFont::StyleOblique);
            } else if (style == QLatin1String("inherit")) {
                //inherited already
            }
        }
        if (!weight.isEmpty()) {
            bool ok = false;
            int weightNum = weight.toInt(&ok);
            if (ok) {
                switch (weightNum) {
                case 100:
                case 200:
                    font.setWeight(QFont::Light);
                    break;
                case 300:
                case 400:
                    font.setWeight(QFont::Normal);
                    break;
                case 500:
                case 600:
                    font.setWeight(QFont::DemiBold);
                    break;
                case 700:
                case 800:
                    font.setWeight(QFont::Bold);
                    break;
                case 900:
                    font.setWeight(QFont::Black);
                    break;
                default:
                    break;
                }
            } else {
                if (weight == QLatin1String("normal")) {
                    font.setWeight(QFont::Normal);
                } else if (weight == QLatin1String("bold")) {
                    font.setWeight(QFont::Bold);
                } else if (weight == QLatin1String("bolder")) {
                    font.setWeight(QFont::DemiBold);
                } else if (weight == QLatin1String("lighter")) {
                    font.setWeight(QFont::Light);
                }
            }
        }
        // QFontInfo fi(font);
        // font.setPointSize(fi.pointSize());
        return true;
    }

    return false;
}

static void parseFont(QSvgNode *node,
                      const QSvgAttributes &attributes,
                      QSvgHandler *handler)
{
    QFont font;

    QSvgFontStyle *inherited =
        static_cast<QSvgFontStyle*>(node->styleProperty(
                                        QSvgStyleProperty::FONT));
    if (!inherited)
        inherited =
            static_cast<QSvgFontStyle*>(node->parent()->styleProperty(
                                            QSvgStyleProperty::FONT));
    if (inherited)
        font = inherited->qfont();
    if (parseQFont(attributes, font, handler)) {
        QString myId = someId(attributes);
        QString anchor = attributes.value(QLatin1String("text-anchor")).toString();
        QSvgTinyDocument *doc = node->document();
        QSvgFontStyle *fontStyle = 0;
        QString family = (font.family().isEmpty())?myId:font.family();
        if (!family.isEmpty()) {
            QSvgFont *svgFont = doc->svgFont(family);
            if (svgFont) {
                fontStyle = new QSvgFontStyle(svgFont, doc);
                if (font.pixelSize() < 0)
                    fontStyle->setPointSize(font.pointSizeF());
                else
                    fontStyle->setPointSize(font.pixelSize());
            }
        }
        if (!fontStyle)
            fontStyle = new QSvgFontStyle(font, node->document());
        if (!anchor.isEmpty())
            fontStyle->setTextAnchor(anchor);

        node->appendStyleProperty(fontStyle, myId);
    }
}

static void parseTransform(QSvgNode *node,
                           const QSvgAttributes &attributes,
                           QSvgHandler *)
{
    QString value = attributes.value(QLatin1String("transform")).toString();
    QString myId = someId(attributes);
    value = value.trimmed();
    if (value.isEmpty())
        return;
    QMatrix matrix = parseTransformationMatrix(value);

    if (!matrix.isIdentity()) {
        node->appendStyleProperty(new QSvgTransformStyle(matrix), myId);
    }

}

static void parseVisibility(QSvgNode *node,
                            const QSvgAttributes &attributes,
                            QSvgHandler *)
{
    QString value = attributes.value(QLatin1String("visibility")).toString();
    QSvgNode *parent = node->parent();

    if (parent && (value.isEmpty() || value == QLatin1String("inherit")))
        node->setVisible(parent->isVisible());
    else if (value == QLatin1String("hidden") || value == QLatin1String("collapse")) {
        node->setVisible(false);
    } else
        node->setVisible(true);
}

static void pathArcSegment(QPainterPath &path,
                           qreal xc, qreal yc,
                           qreal th0, qreal th1,
                           qreal rx, qreal ry, qreal xAxisRotation)
{
    qreal sinTh, cosTh;
    qreal a00, a01, a10, a11;
    qreal x1, y1, x2, y2, x3, y3;
    qreal t;
    qreal thHalf;

    sinTh = sin(xAxisRotation * (Q_PI / 180.0));
    cosTh = cos(xAxisRotation * (Q_PI / 180.0));

    a00 =  cosTh * rx;
    a01 = -sinTh * ry;
    a10 =  sinTh * rx;
    a11 =  cosTh * ry;

    thHalf = 0.5 * (th1 - th0);
    t = (8.0 / 3.0) * sin(thHalf * 0.5) * sin(thHalf * 0.5) / sin(thHalf);
    x1 = xc + cos(th0) - t * sin(th0);
    y1 = yc + sin(th0) + t * cos(th0);
    x3 = xc + cos(th1);
    y3 = yc + sin(th1);
    x2 = x3 + t * sin(th1);
    y2 = y3 - t * cos(th1);

    path.cubicTo(a00 * x1 + a01 * y1, a10 * x1 + a11 * y1,
                 a00 * x2 + a01 * y2, a10 * x2 + a11 * y2,
                 a00 * x3 + a01 * y3, a10 * x3 + a11 * y3);
}

// the arc handling code underneath is from XSVG (BSD license)
/*
 * Copyright  2002 USC/Information Sciences Institute
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of
 * Information Sciences Institute not be used in advertising or
 * publicity pertaining to distribution of the software without
 * specific, written prior permission.  Information Sciences Institute
 * makes no representations about the suitability of this software for
 * any purpose.  It is provided "as is" without express or implied
 * warranty.
 *
 * INFORMATION SCIENCES INSTITUTE DISCLAIMS ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL INFORMATION SCIENCES
 * INSTITUTE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
 * OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 */
static void pathArc(QPainterPath &path,
                    qreal               rx,
                    qreal               ry,
                    qreal               x_axis_rotation,
                    int         large_arc_flag,
                    int         sweep_flag,
                    qreal               x,
                    qreal               y,
                    qreal curx, qreal cury)
{
    qreal sin_th, cos_th;
    qreal a00, a01, a10, a11;
    qreal x0, y0, x1, y1, xc, yc;
    qreal d, sfactor, sfactor_sq;
    qreal th0, th1, th_arc;
    int i, n_segs;
    qreal dx, dy, dx1, dy1, Pr1, Pr2, Px, Py, check;

    rx = qAbs(rx);
    ry = qAbs(ry);

    sin_th = sin(x_axis_rotation * (Q_PI / 180.0));
    cos_th = cos(x_axis_rotation * (Q_PI / 180.0));

    dx = (curx - x) / 2.0;
    dy = (cury - y) / 2.0;
    dx1 =  cos_th * dx + sin_th * dy;
    dy1 = -sin_th * dx + cos_th * dy;
    Pr1 = rx * rx;
    Pr2 = ry * ry;
    Px = dx1 * dx1;
    Py = dy1 * dy1;
    /* Spec : check if radii are large enough */
    check = Px / Pr1 + Py / Pr2;
    if (check > 1) {
        rx = rx * sqrt(check);
        ry = ry * sqrt(check);
    }

    a00 =  cos_th / rx;
    a01 =  sin_th / rx;
    a10 = -sin_th / ry;
    a11 =  cos_th / ry;
    x0 = a00 * curx + a01 * cury;
    y0 = a10 * curx + a11 * cury;
    x1 = a00 * x + a01 * y;
    y1 = a10 * x + a11 * y;
    /* (x0, y0) is current point in transformed coordinate space.
       (x1, y1) is new point in transformed coordinate space.

       The arc fits a unit-radius circle in this space.
    */
    d = (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0);
    sfactor_sq = 1.0 / d - 0.25;
    if (sfactor_sq < 0) sfactor_sq = 0;
    sfactor = sqrt(sfactor_sq);
    if (sweep_flag == large_arc_flag) sfactor = -sfactor;
    xc = 0.5 * (x0 + x1) - sfactor * (y1 - y0);
    yc = 0.5 * (y0 + y1) + sfactor * (x1 - x0);
    /* (xc, yc) is center of the circle. */

    th0 = atan2(y0 - yc, x0 - xc);
    th1 = atan2(y1 - yc, x1 - xc);

    th_arc = th1 - th0;
    if (th_arc < 0 && sweep_flag)
        th_arc += 2 * Q_PI;
    else if (th_arc > 0 && !sweep_flag)
        th_arc -= 2 * Q_PI;

    n_segs = int(ceil(qAbs(th_arc / (Q_PI * 0.5 + 0.001))));

    for (i = 0; i < n_segs; i++) {
        pathArcSegment(path, xc, yc,
                       th0 + i * th_arc / n_segs,
                       th0 + (i + 1) * th_arc / n_segs,
                       rx, ry, x_axis_rotation);
    }
}

static bool parsePathDataFast(const QStringRef &dataStr, QPainterPath &path)
{
    qreal x0 = 0, y0 = 0;              // starting point
    qreal x = 0, y = 0;                // current point
    char lastMode = 0;
    QPointF ctrlPt;
    const QChar *str = dataStr.constData();
    const QChar *end = str + dataStr.size();

    while (str != end) {
        while (*str == QLatin1Char(' '))
            ++str;
        QChar pathElem = *str;
        ++str;
        QChar endc = *end;
        *const_cast<QChar *>(end) = 0; // parseNumbersList requires 0-termination that QStringRef cannot guarantee
        QVector<qreal> arg = parseNumbersList(str);
        *const_cast<QChar *>(end) = endc;
        if (pathElem == QLatin1Char('z') || pathElem == QLatin1Char('Z'))
            arg.append(0);//dummy
        while (!arg.isEmpty()) {
            qreal offsetX = x;        // correction offsets
            qreal offsetY = y;        // for relative commands
            switch (pathElem.unicode()) {
            case 'm': {
                if (arg.count() < 2) {
                    arg.pop_front();
                    break;
                }
                x = x0 = arg[0] + offsetX;
                y = y0 = arg[1] + offsetY;
                path.moveTo(x0, y0);
                arg.pop_front(); arg.pop_front();
            }
                break;
            case 'M': {
                if (arg.count() < 2) {
                    arg.pop_front();
                    break;
                }
                x = x0 = arg[0];
                y = y0 = arg[1];

                path.moveTo(x0, y0);
                arg.pop_front(); arg.pop_front();
            }
                break;
            case 'z':
            case 'Z': {
                x = x0;
                y = y0;
                path.closeSubpath();
                arg.pop_front();//pop dummy
            }
                break;
            case 'l': {
                if (arg.count() < 2) {
                    arg.pop_front();
                    break;
                }
                x = arg.front() + offsetX;
                arg.pop_front();
                y = arg.front() + offsetY;
                arg.pop_front();
                path.lineTo(x, y);

            }
                break;
            case 'L': {
                if (arg.count() < 2) {
                    arg.pop_front();
                    break;
                }
                x = arg.front(); arg.pop_front();
                y = arg.front(); arg.pop_front();
                path.lineTo(x, y);
            }
                break;
            case 'h': {
                x = arg.front() + offsetX; arg.pop_front();
                path.lineTo(x, y);
            }
                break;
            case 'H': {
                x = arg[0];
                path.lineTo(x, y);
                arg.pop_front();
            }
                break;
            case 'v': {
                y = arg[0] + offsetY;
                path.lineTo(x, y);
                arg.pop_front();
            }
                break;
            case 'V': {
                y = arg[0];
                path.lineTo(x, y);
                arg.pop_front();
            }
                break;
            case 'c': {
                if (arg.count() < 6) {
                    while (arg.count())
                        arg.pop_front();
                    break;
                }
                QPointF c1(arg[0]+offsetX, arg[1]+offsetY);
                QPointF c2(arg[2]+offsetX, arg[3]+offsetY);
                QPointF e(arg[4]+offsetX, arg[5]+offsetY);
                path.cubicTo(c1, c2, e);
                ctrlPt = c2;
                x = e.x();