C++ QVectorPath类代码示例

// Accelerated paths
void QBlitterPaintEngine::fill(const QVectorPath &path, const QBrush &brush)
{
    Q_D(QBlitterPaintEngine);
    if (path.shape() == QVectorPath::RectangleHint) {
        QRectF rect(((QPointF *) path.points())[0], ((QPointF *) path.points())[2]);
        fillRect(rect, brush);
    } else {
        d->lock();
        d->pmData->markRasterOverlay(path);
        QRasterPaintEngine::fill(path, brush);
    }
}

void QGL2PEXVertexArray::addCentroid(const QVectorPath &path, int subPathIndex)
{
    const QPointF *const points = reinterpret_cast<const QPointF *>(path.points());
    const QPainterPath::ElementType *const elements = path.elements();

    QPointF sum = points[subPathIndex];
    int count = 1;

    for (int i = subPathIndex + 1; i < path.elementCount() && (!elements || elements[i] != QPainterPath::MoveToElement); ++i) {
        sum += points[i];
        ++count;
    }

    const QPointF centroid = sum / qreal(count);
    vertexArray.add(centroid);
}

Q_GUI_EXPORT QPainterPath qt_painterPathFromVectorPath(const QVectorPath &path)
{
    const qreal *points = path.points();
    const QPainterPath::ElementType *types = path.elements();

    QPainterPath p;
    if (types) {
        int id = 0;
        for (int i=0; i<path.elementCount(); ++i) {
            switch(types[i]) {
            case QPainterPath::MoveToElement:
                p.moveTo(QPointF(points[id], points[id+1]));
                id+=2;
                break;
            case QPainterPath::LineToElement:
                p.lineTo(QPointF(points[id], points[id+1]));
                id+=2;
                break;
            case QPainterPath::CurveToElement: {
                QPointF p1(points[id], points[id+1]);
                QPointF p2(points[id+2], points[id+3]);
                QPointF p3(points[id+4], points[id+5]);
                p.cubicTo(p1, p2, p3);
                id+=6;
                break;
            }
            case QPainterPath::CurveToDataElement:
                ;
                break;
            }
        }
    } else {
        p.moveTo(QPointF(points[0], points[1]));
        int id = 2;
        for (int i=1; i<path.elementCount(); ++i) {
            p.lineTo(QPointF(points[id], points[id+1]));
            id+=2;
        }
    }
    if (path.hints() & QVectorPath::WindingFill)
        p.setFillRule(Qt::WindingFill);

    return p;
}

void QEmulationPaintEngine::stroke(const QVectorPath &path, const QPen &pen)
{
    QPainterState *s = state();

    if (s->bgMode == Qt::OpaqueMode && pen.style() > Qt::SolidLine) {
        QPen bgPen = pen;
        bgPen.setBrush(s->bgBrush);
        bgPen.setStyle(Qt::SolidLine);
        real_engine->stroke(path, bgPen);
    }

    QBrush brush = pen.brush();
    QPen copy = pen;
    Qt::BrushStyle style = qbrush_style(brush);
    if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
        const QGradient *g = brush.gradient();

        if (g->coordinateMode() > QGradient::LogicalMode) {
            if (g->coordinateMode() == QGradient::StretchToDeviceMode) {
                QTransform mat = brush.transform();
                mat.scale(real_engine->painter()->device()->width(), real_engine->painter()->device()->height());
                brush.setTransform(mat);
                copy.setBrush(brush);
                real_engine->stroke(path, copy);
                return;
            } else if (g->coordinateMode() == QGradient::ObjectBoundingMode) {
                QTransform mat = brush.transform();
                QRectF r = path.controlPointRect();
                mat.translate(r.x(), r.y());
                mat.scale(r.width(), r.height());
                brush.setTransform(mat);
                copy.setBrush(brush);
                real_engine->stroke(path, copy);
                return;
            }
        }
    }

    real_engine->stroke(path, pen);
}

void QEmulationPaintEngine::fill(const QVectorPath &path, const QBrush &brush)
{
    QPainterState *s = state();

    if (s->bgMode == Qt::OpaqueMode) {
        Qt::BrushStyle style = brush.style();
        if (style >= Qt::Dense1Pattern && style <= Qt::DiagCrossPattern)
            real_engine->fill(path, s->bgBrush);
    }

    Qt::BrushStyle style = qbrush_style(brush);
    if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
        const QGradient *g = brush.gradient();

        if (g->coordinateMode() > QGradient::LogicalMode) {
            if (g->coordinateMode() == QGradient::StretchToDeviceMode) {
                QBrush copy = brush;
                QTransform mat = copy.transform();
                mat.scale(real_engine->painter()->device()->width(), real_engine->painter()->device()->height());
                copy.setTransform(mat);
                real_engine->fill(path, copy);
                return;
            } else if (g->coordinateMode() == QGradient::ObjectBoundingMode) {
                QBrush copy = brush;
                QTransform mat = copy.transform();
                QRectF r = path.controlPointRect();
                mat.translate(r.x(), r.y());
                mat.scale(r.width(), r.height());
                copy.setTransform(mat);
                real_engine->fill(path, copy);
                return;
            }
        }
    }

    real_engine->fill(path, brush);
}

void QGL2PEXVertexArray::addPath(const QVectorPath &path, GLfloat curveInverseScale, bool outline)
{
    const QPointF* const points = reinterpret_cast<const QPointF*>(path.points());
    const QPainterPath::ElementType* const elements = path.elements();

    if (boundingRectDirty) {
        minX = maxX = points[0].x();
        minY = maxY = points[0].y();
        boundingRectDirty = false;
    }

    if (!outline && !path.isConvex())
        addCentroid(path, 0);

    int lastMoveTo = vertexArray.size();
    vertexArray.add(points[0]); // The first element is always a moveTo

    do {
        if (!elements) {
//             qDebug("QVectorPath has no elements");
            // If the path has a null elements pointer, the elements implicitly
            // start with a moveTo (already added) and continue with lineTos:
            for (int i=1; i<path.elementCount(); ++i)
                lineToArray(points[i].x(), points[i].y());

            break;
        }
//         qDebug("QVectorPath has element types");

        for (int i=1; i<path.elementCount(); ++i) {
            switch (elements[i]) {
            case QPainterPath::MoveToElement:
                if (!outline)
                    addClosingLine(lastMoveTo);
//                qDebug("element[%d] is a MoveToElement", i);
                vertexArrayStops.add(vertexArray.size());
                if (!outline) {
                    if (!path.isConvex()) addCentroid(path, i);
                    lastMoveTo = vertexArray.size();
                }
                lineToArray(points[i].x(), points[i].y()); // Add the moveTo as a new vertex
                break;
            case QPainterPath::LineToElement:
//                qDebug("element[%d] is a LineToElement", i);
                lineToArray(points[i].x(), points[i].y());
                break;
            case QPainterPath::CurveToElement: {
                QBezier b = QBezier::fromPoints(*(((const QPointF *) points) + i - 1),
                                                points[i],
                                                points[i+1],
                                                points[i+2]);
                QRectF bounds = b.bounds();
                // threshold based on same algorithm as in qtriangulatingstroker.cpp
                int threshold = qMin<float>(64, qMax(bounds.width(), bounds.height()) * 3.14f / (curveInverseScale * 6));
                if (threshold < 3) threshold = 3;
                qreal one_over_threshold_minus_1 = qreal(1) / (threshold - 1);
                for (int t=0; t<threshold; ++t) {
                    QPointF pt = b.pointAt(t * one_over_threshold_minus_1);
                    lineToArray(pt.x(), pt.y());
                }
                i += 2;
                break; }
            default:
                break;
            }
        }
    } while (0);

    if (!outline)
        addClosingLine(lastMoveTo);
    vertexArrayStops.add(vertexArray.size());
}

void QPaintEngineEx::stroke(const QVectorPath &path, const QPen &pen)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QPaintEngineEx::stroke()" << pen;
#endif

    Q_D(QPaintEngineEx);

    if (path.isEmpty())
        return;

    if (!d->strokeHandler) {
        d->strokeHandler = new StrokeHandler(path.elementCount()+4);
        d->stroker.setMoveToHook(qpaintengineex_moveTo);
        d->stroker.setLineToHook(qpaintengineex_lineTo);
        d->stroker.setCubicToHook(qpaintengineex_cubicTo);
    }

    if (!qpen_fast_equals(pen, d->strokerPen)) {
        d->strokerPen = pen;
        d->stroker.setJoinStyle(pen.joinStyle());
        d->stroker.setCapStyle(pen.capStyle());
        d->stroker.setMiterLimit(pen.miterLimit());
        qreal penWidth = pen.widthF();
        if (penWidth == 0)
            d->stroker.setStrokeWidth(1);
        else
            d->stroker.setStrokeWidth(penWidth);

        Qt::PenStyle style = pen.style();
        if (style == Qt::SolidLine) {
            d->activeStroker = &d->stroker;
        } else if (style == Qt::NoPen) {
            d->activeStroker = 0;
        } else {
            d->dasher.setDashPattern(pen.dashPattern());
            d->dasher.setDashOffset(pen.dashOffset());
            d->activeStroker = &d->dasher;
        }
    }

    if (!d->activeStroker) {
        return;
    }

    if (pen.style() > Qt::SolidLine) {
        if (pen.isCosmetic()) {
            d->activeStroker->setClipRect(d->exDeviceRect);
        } else {
            QRectF clipRect = state()->matrix.inverted().mapRect(QRectF(d->exDeviceRect));
            d->activeStroker->setClipRect(clipRect);
        }
    }

    const QPainterPath::ElementType *types = path.elements();
    const qreal *points = path.points();
    int pointCount = path.elementCount();

    const qreal *lastPoint = points + (pointCount<<1);

    d->strokeHandler->types.reset();
    d->strokeHandler->pts.reset();

    // Some engines might decide to optimize for the non-shape hint later on...
    uint flags = QVectorPath::WindingFill;

    if (path.elementCount() > 2)
        flags |= QVectorPath::NonConvexShapeMask;

    if (d->stroker.capStyle() == Qt::RoundCap || d->stroker.joinStyle() == Qt::RoundJoin)
        flags |= QVectorPath::CurvedShapeMask;

    // ### Perspective Xforms are currently not supported...
    if (!pen.isCosmetic()) {
        // We include cosmetic pens in this case to avoid having to
        // change the current transform. Normal transformed,
        // non-cosmetic pens will be transformed as part of fill
        // later, so they are also covered here..
        d->activeStroker->setCurveThresholdFromTransform(state()->matrix);
        d->activeStroker->begin(d->strokeHandler);
        if (types) {
            while (points < lastPoint) {
                switch (*types) {
                case QPainterPath::MoveToElement:
                    d->activeStroker->moveTo(points[0], points[1]);
                    points += 2;
                    ++types;
                    break;
                case QPainterPath::LineToElement:
                    d->activeStroker->lineTo(points[0], points[1]);
                    points += 2;
                    ++types;
                    break;
                case QPainterPath::CurveToElement:
                    d->activeStroker->cubicTo(points[0], points[1],
                                              points[2], points[3],
                                              points[4], points[5]);
                    points += 6;
                    types += 3;
                    flags |= QVectorPath::CurvedShapeMask;
//.........这里部分代码省略.........

void QOutlineMapper::endOutline()
{
    closeSubpath();

    if (m_elements.isEmpty()) {
        memset(&m_outline, 0, sizeof(m_outline));
        return;
    }

    QPointF *elements = m_elements.data();

    // Transform the outline
    if (m_txop == QTransform::TxNone) {
        // Nothing to do.
    } else if (m_txop == QTransform::TxTranslate) {
        for (int i = 0; i < m_elements.size(); ++i) {
            QPointF &e = elements[i];
            e = QPointF(e.x() + m_dx, e.y() + m_dy);
        }
    } else if (m_txop == QTransform::TxScale) {
        for (int i = 0; i < m_elements.size(); ++i) {
            QPointF &e = elements[i];
            e = QPointF(m_m11 * e.x() + m_dx, m_m22 * e.y() + m_dy);
        }
    } else if (m_txop < QTransform::TxProject) {
        for (int i = 0; i < m_elements.size(); ++i) {
            QPointF &e = elements[i];
            e = QPointF(m_m11 * e.x() + m_m21 * e.y() + m_dx,
                        m_m22 * e.y() + m_m12 * e.x() + m_dy);
        }
    } else {
        const QVectorPath vp((qreal *)elements, m_elements.size(),
                             m_element_types.size() ? m_element_types.data() : 0);
        QPainterPath path = vp.convertToPainterPath();
        path = QTransform(m_m11, m_m12, m_m13, m_m21, m_m22, m_m23, m_dx, m_dy, m_m33).map(path);
        if (!(m_outline.flags & QT_FT_OUTLINE_EVEN_ODD_FILL))
            path.setFillRule(Qt::WindingFill);
        uint old_txop = m_txop;
        m_txop = QTransform::TxNone;
        if (path.isEmpty())
            m_valid = false;
        else
            convertPath(path);
        m_txop = old_txop;
        return;
    }

    if (m_round_coords) {
        // round coordinates to match outlines drawn with drawLine_midpoint_i
        for (int i = 0; i < m_elements.size(); ++i)
            elements[i] = QPointF(qFloor(elements[i].x() + aliasedCoordinateDelta),
                                  qFloor(elements[i].y() + aliasedCoordinateDelta));
    }

    controlPointRect = boundingRect(elements, m_elements.size());

#ifdef QT_DEBUG_CONVERT
    printf(" - control point rect (%.2f, %.2f) %.2f x %.2f, clip=(%d,%d, %dx%d)\n",
           controlPointRect.x(), controlPointRect.y(),
           controlPointRect.width(), controlPointRect.height(),
           m_clip_rect.x(), m_clip_rect.y(), m_clip_rect.width(), m_clip_rect.height());
#endif


    // Check for out of dev bounds...
    const bool do_clip = !m_in_clip_elements && ((controlPointRect.left() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.right() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.top() < -QT_RASTER_COORD_LIMIT
                          || controlPointRect.bottom() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.width() > QT_RASTER_COORD_LIMIT
                          || controlPointRect.height() > QT_RASTER_COORD_LIMIT));

    if (do_clip) {
        clipElements(elements, elementTypes(), m_elements.size());
    } else {
        convertElements(elements, elementTypes(), m_elements.size());
    }
}

void QDashedStrokeProcessor::process(const QVectorPath &path, const QPen &pen)
{

    const qreal *pts = path.points();
    const QPainterPath::ElementType *types = path.elements();
    int count = path.elementCount();

    m_points.reset();
    m_types.reset();

    qreal width = qpen_widthf(pen);
    if (width == 0)
        width = 1;

    m_dash_stroker.setDashPattern(pen.dashPattern());
    m_dash_stroker.setStrokeWidth(pen.isCosmetic() ? width * m_inv_scale : width);
    m_dash_stroker.setMiterLimit(pen.miterLimit());
    qreal curvyness = sqrt(width) * m_inv_scale / 8;

    if (count < 2)
        return;

    const qreal *endPts = pts + (count<<1);

    m_dash_stroker.begin(this);

    if (!types) {
        m_dash_stroker.moveTo(pts[0], pts[1]);
        pts += 2;
        while (pts < endPts) {
            m_dash_stroker.lineTo(pts[0], pts[1]);
            pts += 2;
        }
    } else {
        while (pts < endPts) {
            switch (*types) {
            case QPainterPath::MoveToElement:
                m_dash_stroker.moveTo(pts[0], pts[1]);
                pts += 2;
                ++types;
                break;
            case QPainterPath::LineToElement:
                m_dash_stroker.lineTo(pts[0], pts[1]);
                pts += 2;
                ++types;
                break;
            case QPainterPath::CurveToElement: {
                QBezier b = QBezier::fromPoints(*(((const QPointF *) pts) - 1),
                                                *(((const QPointF *) pts)),
                                                *(((const QPointF *) pts) + 1),
                                                *(((const QPointF *) pts) + 2));
                QRectF bounds = b.bounds();
                int threshold = qMin<float>(64, qMax(bounds.width(), bounds.height()) * curvyness);
                if (threshold < 4)
                    threshold = 4;
                qreal threshold_minus_1 = threshold - 1;
                for (int i=0; i<threshold; ++i) {
                    QPointF pt = b.pointAt(i / threshold_minus_1);
                    m_dash_stroker.lineTo(pt.x(), pt.y());
                }
                pts += 6;
                types += 3;
                break; }
            default: break;
            }
        }
    }

    m_dash_stroker.end();
}

static ComPtr<ID2D1PathGeometry1> vectorPathToID2D1PathGeometry(const QVectorPath &path, bool alias)
{
    ComPtr<ID2D1PathGeometry1> pathGeometry;
    HRESULT hr = factory()->CreatePathGeometry(pathGeometry.GetAddressOf());
    if (FAILED(hr)) {
        qWarning("%s: Could not create path geometry: %#x", __FUNCTION__, hr);
        return NULL;
    }

    if (path.isEmpty())
        return pathGeometry;

    ComPtr<ID2D1GeometrySink> sink;
    hr = pathGeometry->Open(sink.GetAddressOf());
    if (FAILED(hr)) {
        qWarning("%s: Could not create geometry sink: %#x", __FUNCTION__, hr);
        return NULL;
    }

    sink->SetFillMode(path.hasWindingFill() ? D2D1_FILL_MODE_WINDING
                                            : D2D1_FILL_MODE_ALTERNATE);

    bool inFigure = false;

    const QPainterPath::ElementType *types = path.elements();
    const int count = path.elementCount();
    const qreal *points = 0;

    QScopedArrayPointer<qreal> rounded_points;

    if (alias) {
        // Aliased painting, round to whole numbers
        rounded_points.reset(new qreal[count * 2]);
        points = rounded_points.data();

        for (int i = 0; i < (count * 2); i++)
            rounded_points[i] = qRound(path.points()[i]);
    } else {
        // Antialiased painting, keep original numbers
        points = path.points();
    }

    Q_ASSERT(points);

    if (types) {
        qreal x, y;

        for (int i = 0; i < count; i++) {
            x = points[i * 2];
            y = points[i * 2 + 1];

            switch (types[i]) {
            case QPainterPath::MoveToElement:
                if (inFigure)
                    sink->EndFigure(D2D1_FIGURE_END_OPEN);

                sink->BeginFigure(D2D1::Point2F(x, y), D2D1_FIGURE_BEGIN_FILLED);
                inFigure = true;
                break;

            case QPainterPath::LineToElement:
                sink->AddLine(D2D1::Point2F(x, y));
                break;

            case QPainterPath::CurveToElement:
            {
                Q_ASSERT((i + 2) < count);
                Q_ASSERT(types[i+1] == QPainterPath::CurveToDataElement);
                Q_ASSERT(types[i+2] == QPainterPath::CurveToDataElement);

                i++;
                const qreal x2 = points[i * 2];
                const qreal y2 = points[i * 2 + 1];

                i++;
                const qreal x3 = points[i * 2];
                const qreal y3 = points[i * 2 + 1];

                D2D1_BEZIER_SEGMENT segment = {
                    D2D1::Point2F(x, y),
                    D2D1::Point2F(x2, y2),
                    D2D1::Point2F(x3, y3)
                };

                sink->AddBezier(segment);
            }
                break;

            case QPainterPath::CurveToDataElement:
                qWarning("%s: Unhandled Curve Data Element", __FUNCTION__);
                break;
            }
        }
    } else {
        sink->BeginFigure(D2D1::Point2F(points[0], points[1]), D2D1_FIGURE_BEGIN_FILLED);
        inFigure = true;

        for (int i = 1; i < count; i++)
            sink->AddLine(D2D1::Point2F(points[i * 2], points[i * 2 + 1]));
    }
//.........这里部分代码省略.........