Merge branch '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-2 into 4.7-integration

* '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-2:
  Try to use multisampled opengl graphicssystem on all platforms
  Make sure recreateEglSurface creates a surface if there isn't one
  QX11GL: Implement QX11GLWindowSurface::grabWidget
  QX11GL: Cleanup the window surface & remove some synchronisation
  QX11GL: Move the shared context ownership into a seperate class
  QX11GL: Don't do glFinish in endPaint
  Implement QGLPaintDevice::metric()
  Remove dead code left after a merge conflict resolution
  Fixed autotest failures in tst_QPainterPath.
  Removed bezier intersection code in path clipper.
  Diagram scene example (graphicsview/diagramscene) refresh problem.
  When using Qt::BypassGraphicsProxyWidget with QMenu the application is not stuck anymore

27 files changed, 379 insertions, 1025 deletions

diff --git a/examples/graphicsview/diagramscene/diagramitem.cpp b/examples/graphicsview/diagramscene/diagramitem.cpp
index ee028bb..41534d1 100644
--- a/examples/graphicsview/diagramscene/diagramitem.cpp
+++ b/examples/graphicsview/diagramscene/diagramitem.cpp
@@ -82,6 +82,7 @@ DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
     setPolygon(myPolygon);
     setFlag(QGraphicsItem::ItemIsMovable, true);
     setFlag(QGraphicsItem::ItemIsSelectable, true);
+    setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
 }
 //! [0]
 
diff --git a/src/gui/graphicsview/qgraphicsproxywidget.cpp b/src/gui/graphicsview/qgraphicsproxywidget.cpp
index ad7cf5d..1f89714 100644
--- a/src/gui/graphicsview/qgraphicsproxywidget.cpp
+++ b/src/gui/graphicsview/qgraphicsproxywidget.cpp
@@ -1024,9 +1024,18 @@ void QGraphicsProxyWidget::contextMenuEvent(QGraphicsSceneContextMenuEvent *even
     // Map event position from us to the receiver
     pos = d->mapToReceiver(pos, receiver);
 
+    QPoint globalPos = receiver->mapToGlobal(pos.toPoint());
+    //If the receiver by-pass the proxy its popups
+    //will be top level QWidgets therefore they need
+    //the screen position. mapToGlobal expect the widget to
+    //have proper coordinates in regards of the windowing system
+    //but it's not true because the widget is embedded.
+    if (bypassGraphicsProxyWidget(receiver))
+        globalPos = event->screenPos();
+
     // Send mouse event. ### Doesn't propagate the event.
     QContextMenuEvent contextMenuEvent(QContextMenuEvent::Reason(event->reason()),
-                                       pos.toPoint(), receiver->mapToGlobal(pos.toPoint()), event->modifiers());
+                                       pos.toPoint(), globalPos, event->modifiers());
     QApplication::sendEvent(receiver, &contextMenuEvent);
 
     event->setAccepted(contextMenuEvent.isAccepted());
diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index 046bc7f..441e823 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -7322,7 +7322,7 @@ void QWidgetPrivate::hide_helper()
 
     bool isEmbedded = false;
 #if !defined QT_NO_GRAPHICSVIEW
-    isEmbedded = q->isWindow() && nearestGraphicsProxyWidget(q->parentWidget()) != 0;
+    isEmbedded = q->isWindow() && !bypassGraphicsProxyWidget(q) && nearestGraphicsProxyWidget(q->parentWidget()) != 0;
 #else
     Q_UNUSED(isEmbedded);
 #endif
diff --git a/src/gui/painting/qbezier.cpp b/src/gui/painting/qbezier.cpp
index a08c79e..7ff2a37 100644
--- a/src/gui/painting/qbezier.cpp
+++ b/src/gui/painting/qbezier.cpp
@@ -612,88 +612,6 @@ give_up:
     return o - curveSegments;
 }
 
-#if 0
-static inline bool IntersectBB(const QBezier &a, const QBezier &b)
-{
-    return a.bounds().intersects(b.bounds());
-}
-#else
-static int IntersectBB(const QBezier &a, const QBezier &b)
-{
-    // Compute bounding box for a
-    qreal minax, maxax, minay, maxay;
-    if (a.x1 > a.x4)	 // These are the most likely to be extremal
-	minax = a.x4, maxax = a.x1;
-    else
-	minax = a.x1, maxax = a.x4;
-
-    if (a.x3 < minax)
-	minax = a.x3;
-    else if (a.x3 > maxax)
-	maxax = a.x3;
-
-    if (a.x2 < minax)
-	minax = a.x2;
-    else if (a.x2 > maxax)
-	maxax = a.x2;
-
-    if (a.y1 > a.y4)
-	minay = a.y4, maxay = a.y1;
-    else
-	minay = a.y1, maxay = a.y4;
-
-    if (a.y3 < minay)
-	minay = a.y3;
-    else if (a.y3 > maxay)
-	maxay = a.y3;
-
-    if (a.y2 < minay)
-	minay = a.y2;
-    else if (a.y2 > maxay)
-	maxay = a.y2;
-
-    // Compute bounding box for b
-    qreal minbx, maxbx, minby, maxby;
-    if (b.x1 > b.x4)
-	minbx = b.x4, maxbx = b.x1;
-    else
-	minbx = b.x1, maxbx = b.x4;
-
-    if (b.x3 < minbx)
-	minbx = b.x3;
-    else if (b.x3 > maxbx)
-	maxbx = b.x3;
-
-    if (b.x2 < minbx)
-	minbx = b.x2;
-    else if (b.x2 > maxbx)
-	maxbx = b.x2;
-
-    if (b.y1 > b.y4)
-	minby = b.y4, maxby = b.y1;
-    else
-	minby = b.y1, maxby = b.y4;
-
-    if (b.y3 < minby)
-	minby = b.y3;
-    else if (b.y3 > maxby)
-	maxby = b.y3;
-
-    if (b.y2 < minby)
-	minby = b.y2;
-    else if (b.y2 > maxby)
-	maxby = b.y2;
-
-    // Test bounding box of b against bounding box of a
-    if ((minax > maxbx) || (minay > maxby)  // Not >= : need boundary case
-	|| (minbx > maxax) || (minby > maxay))
-	return 0; // they don't intersect
-    else
-	return 1; // they intersect
-}
-#endif
-
-
 #ifdef QDEBUG_BEZIER
 static QDebug operator<<(QDebug dbg, const QBezier &bz)
 {
@@ -705,193 +623,6 @@ static QDebug operator<<(QDebug dbg, const QBezier &bz)
 }
 #endif
 
-static bool RecursivelyIntersect(const QBezier &a, qreal t0, qreal t1, int deptha,
-                                 const QBezier &b, qreal u0, qreal u1, int depthb,
-                                 QVector<QPair<qreal, qreal> > *t)
-{
-#ifdef QDEBUG_BEZIER
-    static int I = 0;
-    int currentD = I;
-    fprintf(stderr, "%d) t0 = %lf, t1 = %lf, deptha = %d\n"
-            "u0 = %lf, u1 = %lf, depthb = %d\n", I++, t0, t1, deptha,
-            u0, u1, depthb);
-#endif
-    if (deptha > 0) {
-	QBezier A[2];
-        a.split(&A[0], &A[1]);
-	qreal tmid = (t0+t1)*0.5;
-        //qDebug()<<"\t1)"<<A[0];
-        //qDebug()<<"\t2)"<<A[1];
-	deptha--;
-	if (depthb > 0) {
-	    QBezier B[2];
-            b.split(&B[0], &B[1]);
-            //qDebug()<<"\t3)"<<B[0];
-            //qDebug()<<"\t4)"<<B[1];
-	    qreal umid = (u0+u1)*0.5;
-	    depthb--;
-	    if (IntersectBB(A[0], B[0])) {
-                //fprintf(stderr, "\t 1 from %d\n", currentD);
-		if (RecursivelyIntersect(A[0], t0, tmid, deptha,
-				     B[0], u0, umid, depthb,
-				     t) && !t)
-                    return true;
-            }
-	    if (IntersectBB(A[1], B[0])) {
-                //fprintf(stderr, "\t 2 from %d\n", currentD);
-		if (RecursivelyIntersect(A[1], tmid, t1, deptha,
-                                     B[0], u0, umid, depthb,
-                                     t) && !t)
-                    return true;
-            }
-	    if (IntersectBB(A[0], B[1])) {
-                //fprintf(stderr, "\t 3 from %d\n", currentD);
-		if (RecursivelyIntersect(A[0], t0, tmid, deptha,
-                                     B[1], umid, u1, depthb,
-                                     t) && !t)
-                    return true;
-            }
-	    if (IntersectBB(A[1], B[1])) {
-                //fprintf(stderr, "\t 4 from %d\n", currentD);
-		if (RecursivelyIntersect(A[1], tmid, t1, deptha,
-				     B[1], umid, u1, depthb,
-				     t) && !t)
-                    return true;
-            }
-            return t ? !t->isEmpty() : false;
-        } else {
-	    if (IntersectBB(A[0], b)) {
-                //fprintf(stderr, "\t 5 from %d\n", currentD);
-		if (RecursivelyIntersect(A[0], t0, tmid, deptha,
-				     b, u0, u1, depthb,
-				     t) && !t)
-                    return true;
-            }
-	    if (IntersectBB(A[1], b)) {
-                //fprintf(stderr, "\t 6 from %d\n", currentD);
-		if (RecursivelyIntersect(A[1], tmid, t1, deptha,
-                                     b, u0, u1, depthb,
-                                     t) && !t)
-                    return true;
-            }
-            return t ? !t->isEmpty() : false;
-        }
-    } else {
-	if (depthb > 0) {
-	    QBezier B[2];
-            b.split(&B[0], &B[1]);
-	    qreal umid = (u0 + u1)*0.5;
-	    depthb--;
-	    if (IntersectBB(a, B[0])) {
-                //fprintf(stderr, "\t 7 from %d\n", currentD);
-		if (RecursivelyIntersect(a, t0, t1, deptha,
-                                     B[0], u0, umid, depthb,
-                                     t) && !t)
-                    return true;
-            }
-	    if (IntersectBB(a, B[1])) {
-                //fprintf(stderr, "\t 8 from %d\n", currentD);
-		if (RecursivelyIntersect(a, t0, t1, deptha,
-                                     B[1], umid, u1, depthb,
-                                     t) && !t)
-                    return true;
-            }
-            return t ? !t->isEmpty() : false;
-        }
-	else {
-            // Both segments are fully subdivided; now do line segments
-	    qreal xlk = a.x4 - a.x1;
-	    qreal ylk = a.y4 - a.y1;
-	    qreal xnm = b.x4 - b.x1;
-	    qreal ynm = b.y4 - b.y1;
-	    qreal xmk = b.x1 - a.x1;
-	    qreal ymk = b.y1 - a.y1;
-	    qreal det = xnm * ylk - ynm * xlk;
-	    if (1.0 + det == 1.0) {
-		return false;
-            } else {
-                qreal detinv = 1.0 / det;
-                qreal rs = (xnm * ymk - ynm *xmk) * detinv;
-                qreal rt = (xlk * ymk - ylk * xmk) * detinv;
-                if ((rs < 0.0) || (rs > 1.0) || (rt < 0.0) || (rt > 1.0))
-                    return false;
-
-                if (t) {
-                    const qreal alpha_a = t0 + rs * (t1 - t0);
-                    const qreal alpha_b = u0 + rt * (u1 - u0);
-
-                    *t << qMakePair(alpha_a, alpha_b);
-                }
-
-                return true;
-            }
-        }
-    }
-}
-
-QVector< QPair<qreal, qreal> > QBezier::findIntersections(const QBezier &a, const QBezier &b)
-{
-    QVector< QPair<qreal, qreal> > v(2);
-    findIntersections(a, b, &v);
-    return v;
-}
-
-bool QBezier::findIntersections(const QBezier &a, const QBezier &b,
-                                QVector<QPair<qreal, qreal> > *t)
-{
-    if (IntersectBB(a, b)) {
-        QPointF la1(qFabs((a.x3 - a.x2) - (a.x2 - a.x1)),
-                    qFabs((a.y3 - a.y2) - (a.y2 - a.y1)));
-	QPointF la2(qFabs((a.x4 - a.x3) - (a.x3 - a.x2)),
-                    qFabs((a.y4 - a.y3) - (a.y3 - a.y2)));
-	QPointF la;
-	if (la1.x() > la2.x()) la.setX(la1.x()); else la.setX(la2.x());
-	if (la1.y() > la2.y()) la.setY(la1.y()); else la.setY(la2.y());
-	QPointF lb1(qFabs((b.x3 - b.x2) - (b.x2 - b.x1)),
-                    qFabs((b.y3 - b.y2) - (b.y2 - b.y1)));
-	QPointF lb2(qFabs((b.x4 - b.x3) - (b.x3 - b.x2)),
-                    qFabs((b.y4 - b.y3) - (b.y3 - b.y2)));
-	QPointF lb;
-	if (lb1.x() > lb2.x()) lb.setX(lb1.x()); else lb.setX(lb2.x());
-	if (lb1.y() > lb2.y()) lb.setY(lb1.y()); else lb.setY(lb2.y());
-	qreal l0;
-	if (la.x() > la.y())
-	    l0 = la.x();
-	else
-	    l0 = la.y();
-	int ra;
-	if (l0 * 0.75 * M_SQRT2 + 1.0 == 1.0)
-	    ra = 0;
-	else
-	    ra = qCeil(log4(M_SQRT2 * 6.0 / 8.0 * INV_EPS * l0));
-	if (lb.x() > lb.y())
-	    l0 = lb.x();
-	else
-	    l0 = lb.y();
-	int rb;
-	if (l0 * 0.75 * M_SQRT2 + 1.0 == 1.0)
-	    rb = 0;
-	else
-	    rb = qCeil(log4(M_SQRT2 * 6.0 / 8.0 * INV_EPS * l0));
-
-        // if qreal is float then halve the number of subdivisions
-        if (sizeof(qreal) == 4) {
-            ra /= 2;
-            rb /= 2;
-        }
-
-	return RecursivelyIntersect(a, 0., 1., ra, b, 0., 1., rb, t);
-    }
-
-    //Don't sort here because it breaks the orders of corresponding
-    //  intersections points. this way t's at the same locations correspond
-    //  to the same intersection point.
-    //qSort(parameters[0].begin(), parameters[0].end(), qLess<qreal>());
-    //qSort(parameters[1].begin(), parameters[1].end(), qLess<qreal>());
-
-    return false;
-}
-
 static inline void splitBezierAt(const QBezier &bez, qreal t,
                                  QBezier *left, QBezier *right)
 {
@@ -920,42 +651,6 @@ static inline void splitBezierAt(const QBezier &bez, qreal t,
     right->y4 = bez.y4;
 }
 
-QVector< QList<QBezier> > QBezier::splitAtIntersections(QBezier &b)
-{
-    QVector< QList<QBezier> > curves(2);
-
-    QVector< QPair<qreal, qreal> > allInters = findIntersections(*this, b);
-
-    QList<qreal> inters1;
-    QList<qreal> inters2;
-
-    for (int i = 0; i < allInters.size(); ++i) {
-        inters1 << allInters[i].first;
-        inters2 << allInters[i].second;
-    }
-
-    qSort(inters1.begin(), inters1.end(), qLess<qreal>());
-    qSort(inters2.begin(), inters2.end(), qLess<qreal>());
-
-    Q_ASSERT(inters1.count() == inters2.count());
-
-    int i;
-    for (i = 0; i < inters1.count(); ++i) {
-        qreal t1 = inters1.at(i);
-        qreal t2 = inters2.at(i);
-
-        QBezier curve1, curve2;
-        parameterSplitLeft(t1, &curve1);
-	b.parameterSplitLeft(t2, &curve2);
-        curves[0].append(curve1);
-        curves[0].append(curve2);
-    }
-    curves[0].append(*this);
-    curves[1].append(b);
-
-    return curves;
-}
-
 qreal QBezier::length(qreal error) const
 {
     qreal length = 0.0;
diff --git a/src/gui/painting/qbezier_p.h b/src/gui/painting/qbezier_p.h
index f015ea8..846635f 100644
--- a/src/gui/painting/qbezier_p.h
+++ b/src/gui/painting/qbezier_p.h
@@ -111,16 +111,7 @@ public:
     int shifted(QBezier *curveSegments, int maxSegmets,
                 qreal offset, float threshold) const;
 
-    QVector< QList<QBezier> > splitAtIntersections(QBezier &a);
-
     QBezier bezierOnInterval(qreal t0, qreal t1) const;
-
-    static QVector< QPair<qreal, qreal> > findIntersections(const QBezier &a,
-                                                     const QBezier &b);
-
-    static bool findIntersections(const QBezier &a, const QBezier &b,
-                                  QVector<QPair<qreal, qreal> > *t);
-
     QBezier getSubRange(qreal t0, qreal t1) const;
 
     qreal x1, y1, x2, y2, x3, y3, x4, y4;
diff --git a/src/gui/painting/qpainterpath.cpp b/src/gui/painting/qpainterpath.cpp
index 965b84c..f5a698e 100644
--- a/src/gui/painting/qpainterpath.cpp
+++ b/src/gui/painting/qpainterpath.cpp
@@ -3167,6 +3167,8 @@ void QPainterPath::addRoundRect(const QRectF &r, int xRnd, int yRnd)
 
     Set operations on paths will treat the paths as areas. Non-closed
     paths will be treated as implicitly closed.
+    Bezier curves may be flattened to line segments due to numerical instability of
+    doing bezier curve intersections.
 
     \sa intersected(), subtracted()
 */
@@ -3182,6 +3184,8 @@ QPainterPath QPainterPath::united(const QPainterPath &p) const
     \since 4.3
 
     Returns a path which is the intersection of this path's fill area and \a p's fill area.
+    Bezier curves may be flattened to line segments due to numerical instability of
+    doing bezier curve intersections.
 */
 QPainterPath QPainterPath::intersected(const QPainterPath &p) const
 {
@@ -3198,7 +3202,8 @@ QPainterPath QPainterPath::intersected(const QPainterPath &p) const
 
     Set operations on paths will treat the paths as areas. Non-closed
     paths will be treated as implicitly closed.
-
+    Bezier curves may be flattened to line segments due to numerical instability of
+    doing bezier curve intersections.
 */
 QPainterPath QPainterPath::subtracted(const QPainterPath &p) const
 {
@@ -3227,6 +3232,8 @@ QPainterPath QPainterPath::subtractedInverted(const QPainterPath &p) const
     Returns a simplified version of this path. This implies merging all subpaths that intersect,
     and returning a path containing no intersecting edges. Consecutive parallel lines will also
     be merged. The simplified path will always use the default fill rule, Qt::OddEvenFill.
+    Bezier curves may be flattened to line segments due to numerical instability of
+    doing bezier curve intersections.
 */
 QPainterPath QPainterPath::simplified() const
 {
diff --git a/src/gui/painting/qpathclipper.cpp b/src/gui/painting/qpathclipper.cpp
index 00e74ba..9dedf3a 100644
--- a/src/gui/painting/qpathclipper.cpp
+++ b/src/gui/painting/qpathclipper.cpp
@@ -105,22 +105,10 @@ public:
     bool hasIntersections(const QPathSegments &a, const QPathSegments &b) const;
 
 private:
-    void intersectBeziers(const QBezier &one, const QBezier &two, QVector<QPair<qreal, qreal> > &t, QDataBuffer<QIntersection> &intersections);
     void intersectLines(const QLineF &a, const QLineF &b, QDataBuffer<QIntersection> &intersections);
-
-    bool beziersIntersect(const QBezier &one, const QBezier &two) const;
     bool linesIntersect(const QLineF &a, const QLineF &b) const;
 };
 
-bool QIntersectionFinder::beziersIntersect(const QBezier &one, const QBezier &two) const
-{
-    return (comparePoints(one.pt1(), two.pt1()) && comparePoints(one.pt2(), two.pt2())
-            && comparePoints(one.pt3(), two.pt3()) && comparePoints(one.pt4(), two.pt4()))
-           || (comparePoints(one.pt1(), two.pt4()) && comparePoints(one.pt2(), two.pt3())
-               && comparePoints(one.pt3(), two.pt2()) && comparePoints(one.pt4(), two.pt1()))
-           || QBezier::findIntersections(one, two, 0);
-}
-
 bool QIntersectionFinder::linesIntersect(const QLineF &a, const QLineF &b) const
 {
     const QPointF p1 = a.p1();
@@ -174,11 +162,6 @@ bool QIntersectionFinder::linesIntersect(const QLineF &a, const QLineF &b) const
         return false;
     }
 
-    // if the lines are not parallel and share a common end point, then they
-    // don't intersect
-    if (p1_equals_q1 || p1_equals_q2 || p2_equals_q1 || p2_equals_q2)
-        return false;
-
     const qreal invPar = 1 / par;
 
     const qreal tp = (qDelta.y() * (q1.x() - p1.x()) -
@@ -193,48 +176,6 @@ bool QIntersectionFinder::linesIntersect(const QLineF &a, const QLineF &b) const
     return tq >= 0 && tq <= 1;
 }
 
-void QIntersectionFinder::intersectBeziers(const QBezier &one, const QBezier &two, QVector<QPair<qreal, qreal> > &t, QDataBuffer<QIntersection> &intersections)
-{
-    if ((comparePoints(one.pt1(), two.pt1()) && comparePoints(one.pt2(), two.pt2())
-         && comparePoints(one.pt3(), two.pt3()) && comparePoints(one.pt4(), two.pt4()))
-        || (comparePoints(one.pt1(), two.pt4()) && comparePoints(one.pt2(), two.pt3())
-            && comparePoints(one.pt3(), two.pt2()) && comparePoints(one.pt4(), two.pt1()))) {
-
-        return;
-    }
-
-    t.clear();
-
-    if (!QBezier::findIntersections(one, two, &t))
-        return;
-
-    int count = t.size();
-
-    for (int i = 0; i < count; ++i) {
-        qreal alpha_p = t.at(i).first;
-        qreal alpha_q = t.at(i).second;
-
-        QPointF pt;
-        if (qFuzzyIsNull(alpha_p)) {
-            pt = one.pt1();
-        } else if (qFuzzyIsNull(alpha_p - 1)) {
-            pt = one.pt4();
-        } else if (qFuzzyIsNull(alpha_q)) {
-            pt = two.pt1();
-        } else if (qFuzzyIsNull(alpha_q - 1)) {
-            pt = two.pt4();
-        } else {
-            pt = one.pointAt(alpha_p);
-        }
-
-        QIntersection intersection;
-        intersection.alphaA = alpha_p;
-        intersection.alphaB = alpha_q;
-        intersection.pos = pt;
-        intersections.add(intersection);
-    }
-}
-
 void QIntersectionFinder::intersectLines(const QLineF &a, const QLineF &b, QDataBuffer<QIntersection> &intersections)
 {
     const QPointF p1 = a.p1();
@@ -357,19 +298,8 @@ void QIntersectionFinder::intersectLines(const QLineF &a, const QLineF &b, QData
     intersections.add(intersection);
 }
 
-static const QBezier bezierFromLine(const QLineF &line)
-{
-    const QPointF p1 = line.p1();
-    const QPointF p2 = line.p2();
-    const QPointF delta = (p2 - p1) / 3;
-    return QBezier::fromPoints(p1, p1 + delta, p1 + 2 * delta, p2);
-}
-
 bool QIntersectionFinder::hasIntersections(const QPathSegments &a, const QPathSegments &b) const
 {
-    QBezier tempA;
-    QBezier tempB;
-
     if (a.segments() == 0 || b.segments() == 0)
         return false;
 
@@ -391,9 +321,6 @@ bool QIntersectionFinder::hasIntersections(const QPathSegments &a, const QPathSe
     QRectF rb(minX, minY, maxX - minX, maxY - minY);
 
     for (int i = 0; i < a.segments(); ++i) {
-        const QBezier *bezierA = a.bezierAt(i);
-        bool isBezierA = bezierA != 0;
-
         const QRectF &r1 = a.elementBounds(i);
 
         if (r1.left() > rb.right() || rb.left() > r1.right())
@@ -409,28 +336,8 @@ bool QIntersectionFinder::hasIntersections(const QPathSegments &a, const QPathSe
             if (r1.top() > r2.bottom() || r2.top() > r1.bottom())
                 continue;
 
-            bool isBezierB = b.bezierAt(j) != 0;
-
-            if (isBezierA || isBezierB) {
-                const QBezier *bezierB;
-                if (isBezierB) {
-                    bezierB = b.bezierAt(j);
-                } else {
-                    tempB = bezierFromLine(b.lineAt(j));
-                    bezierB = &tempB;
-                }
-
-                if (!bezierA) {
-                    tempA = bezierFromLine(a.lineAt(i));
-                    bezierA = &tempA;
-                }
-
-                if (beziersIntersect(*bezierA, *bezierB))
-                    return true;
-            } else {
-                if (linesIntersect(a.lineAt(i), b.lineAt(j)))
-                    return true;
-            }
+            if (linesIntersect(a.lineAt(i), b.lineAt(j)))
+                return true;
         }
     }
 
@@ -439,16 +346,10 @@ bool QIntersectionFinder::hasIntersections(const QPathSegments &a, const QPathSe
 
 void QIntersectionFinder::produceIntersections(QPathSegments &segments)
 {
-    QBezier tempA;
-    QBezier tempB;
-
     QVector<QPair<qreal, qreal> > t;
     QDataBuffer<QIntersection> intersections;
 
     for (int i = 0; i < segments.segments(); ++i) {
-        const QBezier *bezierA = segments.bezierAt(i);
-        bool isBezierA = bezierA != 0;
-
         const QRectF &r1 = segments.elementBounds(i);
 
         for (int j = 0; j < i; ++j) {
@@ -461,29 +362,10 @@ void QIntersectionFinder::produceIntersections(QPathSegments &segments)
 
             intersections.reset();
 
-            bool isBezierB = segments.bezierAt(j) != 0;
+            const QLineF lineA = segments.lineAt(i);
+            const QLineF lineB = segments.lineAt(j);
 
-            if (isBezierA || isBezierB) {
-                const QBezier *bezierB;
-                if (isBezierB) {
-                    bezierB = segments.bezierAt(j);
-                } else {
-                    tempB = bezierFromLine(segments.lineAt(j));
-                    bezierB = &tempB;
-                }
-
-                if (!bezierA) {
-                    tempA = bezierFromLine(segments.lineAt(i));
-                    bezierA = &tempA;
-                }
-
-                intersectBeziers(*bezierA, *bezierB, t, intersections);
-            } else {
-                const QLineF lineA = segments.lineAt(i);
-                const QLineF lineB = segments.lineAt(j);
-
-                intersectLines(lineA, lineB, intersections);
-            }
+            intersectLines(lineA, lineB, intersections);
 
             for (int k = 0; k < intersections.size(); ++k) {
                 QPathSegments::Intersection i_isect, j_isect;
@@ -731,53 +613,34 @@ void QWingedEdge::intersectAndAdd()
 
         qSort(intersections.data(), intersections.data() + intersections.size());
 
-        const QBezier *bezier = m_segments.bezierAt(i);
-        if (bezier) {
-            int first = m_segments.segmentAt(i).va;
-            int second = m_segments.segmentAt(i).vb;
-
-            qreal alpha = 0.0;
-            int last = first;
-            for (int j = 0; j < intersections.size(); ++j) {
-                const QPathSegments::Intersection &isect = intersections.at(j);
+        int first = m_segments.segmentAt(i).va;
+        int second = m_segments.segmentAt(i).vb;
 
-                addBezierEdge(bezier, last, isect.vertex, alpha, isect.t, pathId);
+        int last = first;
+        for (int j = 0; j < intersections.size(); ++j) {
+            const QPathSegments::Intersection &isect = intersections.at(j);
 
-                alpha = isect.t;
-                last = isect.vertex;
-            }
-
-            addBezierEdge(bezier, last, second, alpha, 1.0, pathId);
-        } else {
-            int first = m_segments.segmentAt(i).va;
-            int second = m_segments.segmentAt(i).vb;
-
-            int last = first;
-            for (int j = 0; j < intersections.size(); ++j) {
-                const QPathSegments::Intersection &isect = intersections.at(j);
-
-                QPathEdge *ep = edge(addEdge(last, isect.vertex));
-
-                if (ep) {
-                    const int dir = m_segments.pointAt(last).y() < m_segments.pointAt(isect.vertex).y() ? 1 : -1;
-                    if (pathId == 0)
-                        ep->windingA += dir;
-                    else
-                        ep->windingB += dir;
-                }
-
-                last = isect.vertex;
-            }
-
-            QPathEdge *ep = edge(addEdge(last, second));
+            QPathEdge *ep = edge(addEdge(last, isect.vertex));
 
             if (ep) {
-                const int dir = m_segments.pointAt(last).y() < m_segments.pointAt(second).y() ? 1 : -1;
+                const int dir = m_segments.pointAt(last).y() < m_segments.pointAt(isect.vertex).y() ? 1 : -1;
                 if (pathId == 0)
                     ep->windingA += dir;
                 else
                     ep->windingB += dir;
             }
+
+            last = isect.vertex;
+        }
+
+        QPathEdge *ep = edge(addEdge(last, second));
+
+        if (ep) {
+            const int dir = m_segments.pointAt(last).y() < m_segments.pointAt(second).y() ? 1 : -1;
+            if (pathId == 0)
+                ep->windingA += dir;
+            else
+                ep->windingB += dir;
         }
     }
 }
@@ -832,7 +695,6 @@ static bool isLine(const QBezier &bezier)
 void QPathSegments::setPath(const QPainterPath &path)
 {
     m_points.reset();
-    m_beziers.reset();
     m_intersections.reset();
     m_segments.reset();
 
@@ -845,6 +707,9 @@ void QPathSegments::addPath(const QPainterPath &path)
 {
     int firstSegment = m_segments.size();
 
+    QRectF pathBounds = path.boundingRect();
+    qreal invPathScale = 1 / qMax(pathBounds.width(), pathBounds.height());
+
     bool hasMoveTo = false;
     int lastMoveTo = 0;
     int last = 0;
@@ -879,8 +744,26 @@ void QPathSegments::addPath(const QPainterPath &path)
                 if (isLine(bezier)) {
                     m_segments << Segment(m_pathId, last, current);
                 } else {
-                    m_segments << Segment(m_pathId, last, current, m_beziers.size());
-                    m_beziers << bezier;
+                    QRectF bounds = bezier.bounds();
+
+                    qreal segmentScale = qMax(bounds.width(), bounds.height());
+
+                    // threshold based on same algorithm as in qtriangulatingstroker.cpp
+                    int threshold = qMin<float>(64, segmentScale * invPathScale * (512 * 3.14f / 6));
+                    if (threshold < 3) threshold = 3;
+                    qreal one_over_threshold_minus_1 = qreal(1) / (threshold - 1);
+
+                    for (int t = 1; t < threshold - 1; ++t) {
+                        currentPoint = bezier.pointAt(t * one_over_threshold_minus_1);
+
+                        int index = m_points.size();
+                        m_segments << Segment(m_pathId, last, index);
+                        last = index;
+
+                        m_points << currentPoint;
+                    }
+
+                    m_segments << Segment(m_pathId, last, current);
                 }
             }
             last = current;
@@ -896,24 +779,19 @@ void QPathSegments::addPath(const QPainterPath &path)
         m_segments << Segment(m_pathId, last, lastMoveTo);
 
     for (int i = firstSegment; i < m_segments.size(); ++i) {
-        const QBezier *bezier = bezierAt(i);
-        if (bezier) {
-            m_segments.at(i).bounds = bezier->bounds();
-        } else {
-            const QLineF line = lineAt(i);
+        const QLineF line = lineAt(i);
 
-            qreal x1 = line.p1().x();
-            qreal y1 = line.p1().y();
-            qreal x2 = line.p2().x();
-            qreal y2 = line.p2().y();
+        qreal x1 = line.p1().x();
+        qreal y1 = line.p1().y();
+        qreal x2 = line.p2().x();
+        qreal y2 = line.p2().y();
 
-            if (x2 < x1)
-                qSwap(x1, x2);
-            if (y2 < y1)
-                qSwap(y1, y2);
+        if (x2 < x1)
+            qSwap(x1, x2);
+        if (y2 < y1)
+            qSwap(y1, y2);
 
-            m_segments.at(i).bounds = QRectF(x1, y1, x2 - x1, y2 - y1);
-        }
+        m_segments.at(i).bounds = QRectF(x1, y1, x2 - x1, y2 - y1);
     }
 
     ++m_pathId;
@@ -948,28 +826,17 @@ static inline QPointF tangentAt(const QWingedEdge &list, int vi, int ei)
     const QPathEdge *ep = list.edge(ei);
     Q_ASSERT(ep);
 
-    qreal t;
     qreal sign;
 
     if (ep->first == vi) {
-        t = ep->t0;
         sign = 1;
     } else {
-        t = ep->t1;
         sign = -1;
     }
 
-    QPointF normal;
-    if (ep->bezier) {
-        normal = ep->bezier->derivedAt(t);
-
-        if (qFuzzyIsNull(normal.x()) && qFuzzyIsNull(normal.y()))
-            normal = ep->bezier->secondDerivedAt(t);
-    } else {
-        const QPointF a = *list.vertex(ep->first);
-        const QPointF b = *list.vertex(ep->second);
-        normal = b - a;
-    }
+    const QPointF a = *list.vertex(ep->first);
+    const QPointF b = *list.vertex(ep->second);
+    QPointF normal = b - a;
 
     return normalize(sign * normal);
 }
@@ -979,83 +846,9 @@ static inline QPointF midPoint(const QWingedEdge &list, int ei)
     const QPathEdge *ep = list.edge(ei);
     Q_ASSERT(ep);
 
-    if (ep->bezier) {
-        return ep->bezier->pointAt(0.5 * (ep->t0 + ep->t1));
-    } else {
-        const QPointF a = *list.vertex(ep->first);
-        const QPointF b = *list.vertex(ep->second);
-        return a + 0.5 * (b - a);
-    }
-}
-
-static QBezier transform(const QBezier &bezier, const QPointF &xAxis, const QPointF &yAxis, const QPointF &origin)
-{
-    QPointF points[4] = {
-        bezier.pt1(),
-        bezier.pt2(),
-        bezier.pt3(),
-        bezier.pt4()
-    };
-
-    for (int i = 0; i < 4; ++i) {
-        const QPointF p = points[i] - origin;
-
-        points[i].rx() = dot(xAxis, p);
-        points[i].ry() = dot(yAxis, p);
-    }
-
-    return QBezier::fromPoints(points[0], points[1], points[2], points[3]);
-}
-
-static bool isLeftOf(const QWingedEdge &list, int vi, int ai, int bi)
-{
-    const QPathEdge *ap = list.edge(ai);
-    const QPathEdge *bp = list.edge(bi);
-
-    Q_ASSERT(ap);
-    Q_ASSERT(bp);
-
-    if (!(ap->bezier || bp->bezier))
-        return false;
-
-    const QPointF tangent = tangentAt(list, vi, ai);
-    const QPointF normal(tangent.y(), -tangent.x());
-
-    const QPointF origin = *list.vertex(vi);
-
-    const QPointF dpA = midPoint(list, ai) - origin;
-    const QPointF dpB = midPoint(list, bi) - origin;
-
-    qreal xA = dot(normal, dpA);
-    qreal xB = dot(normal, dpB);
-
-    if (xA <= 0 && xB >= 0)
-        return true;
-
-    if (xA >= 0 && xB <= 0)
-        return false;
-
-    if (!ap->bezier)
-        return xB > 0;
-
-    if (!bp->bezier)
-        return xA < 0;
-
-    // both are beziers on the same side of the tangent
-
-    // transform the beziers into the local coordinate system
-    // such that positive y is along the tangent, and positive x is along the normal
-
-    QBezier bezierA = transform(*ap->bezier, normal, tangent, origin);
-    QBezier bezierB = transform(*bp->bezier, normal, tangent, origin);
-
-    qreal y = qMin(bezierA.pointAt(0.5 * (ap->t0 + ap->t1)).y(),
-                   bezierB.pointAt(0.5 * (bp->t0 + bp->t1)).y());
-
-    xA = bezierA.pointAt(bezierA.tForY(ap->t0, ap->t1, y)).x();
-    xB = bezierB.pointAt(bezierB.tForY(bp->t0, bp->t1, y)).x();
-
-    return xA < xB;
+    const QPointF a = *list.vertex(ep->first);
+    const QPointF b = *list.vertex(ep->second);
+    return a + 0.5 * (b - a);
 }
 
 QWingedEdge::TraversalStatus QWingedEdge::findInsertStatus(int vi, int ei) const
@@ -1084,7 +877,6 @@ QWingedEdge::TraversalStatus QWingedEdge::findInsertStatus(int vi, int ei) const
         status.flip();
 
         Q_ASSERT(edge(status.edge)->vertex(status.direction) == vi);
-
         qreal d2 = delta(vi, ei, status.edge);
 
 #ifdef QDEBUG_CLIPPER
@@ -1092,8 +884,7 @@ QWingedEdge::TraversalStatus QWingedEdge::findInsertStatus(int vi, int ei) const
         qDebug() << "Delta to edge" << status.edge << d2 << ", angles: " << op->angle << op->invAngle;
 #endif
 
-        if (!(qFuzzyIsNull(d2) && isLeftOf(*this, vi, status.edge, ei))
-            && (d2 < d || (qFuzzyCompare(d2, d) && isLeftOf(*this, vi, status.edge, position)))) {
+        if (d2 < d) {
             position = status.edge;
             d = d2;
         }
@@ -1210,15 +1001,15 @@ static qreal computeAngle(const QPointF &v)
 #endif
 }
 
-int QWingedEdge::addEdge(const QPointF &a, const QPointF &b, const QBezier *bezier, qreal t0, qreal t1)
+int QWingedEdge::addEdge(const QPointF &a, const QPointF &b)
 {
     int fi = insert(a);
     int si = insert(b);
 
-    return addEdge(fi, si, bezier, t0, t1);
+    return addEdge(fi, si);
 }
 
-int QWingedEdge::addEdge(int fi, int si, const QBezier *bezier, qreal t0, qreal t1)
+int QWingedEdge::addEdge(int fi, int si)
 {
     if (fi == si)
         return -1;
@@ -1236,29 +1027,11 @@ int QWingedEdge::addEdge(int fi, int si, const QBezier *bezier, qreal t0, qreal
 
     QPathEdge *ep = edge(ei);
 
-    ep->bezier = bezier;
-    ep->t0 = t0;
-    ep->t1 = t1;
-
-    if (bezier) {
-        QPointF aTangent = bezier->derivedAt(t0);
-        QPointF bTangent = -bezier->derivedAt(t1);
-
-        if (qFuzzyIsNull(aTangent.x()) && qFuzzyIsNull(aTangent.y()))
-            aTangent = bezier->secondDerivedAt(t0);
-
-        if (qFuzzyIsNull(bTangent.x()) && qFuzzyIsNull(bTangent.y()))
-            bTangent = bezier->secondDerivedAt(t1);
-
-        ep->angle = computeAngle(aTangent);
-        ep->invAngle = computeAngle(bTangent);
-    } else {
-        const QPointF tangent = QPointF(*sp) - QPointF(*fp);
-        ep->angle = computeAngle(tangent);
-        ep->invAngle = ep->angle + 64;
-        if (ep->invAngle >= 128)
-            ep->invAngle -= 128;
-    }
+    const QPointF tangent = QPointF(*sp) - QPointF(*fp);
+    ep->angle = computeAngle(tangent);
+    ep->invAngle = ep->angle + 64;
+    if (ep->invAngle >= 128)
+        ep->invAngle -= 128;
 
     QPathVertex *vertices[2] = { fp, sp };
     QPathEdge::Direction dirs[2] = { QPathEdge::Backward, QPathEdge::Forward };
@@ -1313,74 +1086,6 @@ int QWingedEdge::addEdge(int fi, int si, const QBezier *bezier, qreal t0, qreal
     return ei;
 }
 
-void QWingedEdge::addBezierEdge(const QBezier *bezier, int vertexA, int vertexB, qreal alphaA, qreal alphaB, int path)
-{
-    if (qFuzzyCompare(alphaA, alphaB))
-        return;
-
-    qreal alphaMid = (alphaA + alphaB) * 0.5;
-
-    qreal s0 = 0;
-    qreal s1 = 1;
-    int count = bezier->stationaryYPoints(s0, s1);
-
-    m_splitPoints.clear();
-    m_splitPoints << alphaA;
-    m_splitPoints << alphaMid;
-    m_splitPoints << alphaB;
-
-    if (count > 0 && !qFuzzyCompare(s0, alphaA) && !qFuzzyCompare(s0, alphaMid) && !qFuzzyCompare(s0, alphaB) && s0 > alphaA && s0 < alphaB)
-        m_splitPoints << s0;
-
-    if (count > 1 && !qFuzzyCompare(s1, alphaA) && !qFuzzyCompare(s1, alphaMid) && !qFuzzyCompare(s1, alphaB) && s1 > alphaA && s1 < alphaB)
-        m_splitPoints << s1;
-
-    if (count > 0)
-        qSort(m_splitPoints.begin(), m_splitPoints.end());
-
-    int last = vertexA;
-    for (int i = 0; i < m_splitPoints.size() - 1; ++i) {
-        const qreal t0 = m_splitPoints[i];
-        const qreal t1 = m_splitPoints[i+1];
-
-        int current;
-        if ((i + 1) == (m_splitPoints.size() - 1)) {
-            current = vertexB;
-        } else {
-            current = insert(bezier->pointAt(t1));
-        }
-
-        QPathEdge *ep = edge(addEdge(last, current, bezier, t0, t1));
-
-        if (ep) {
-            const int dir = m_vertices.at(last).y < m_vertices.at(current).y ? 1 : -1;
-            if (path == 0)
-                ep->windingA += dir;
-            else
-                ep->windingB += dir;
-        }
-
-        last = current;
-    }
-}
-
-void QWingedEdge::addBezierEdge(const QBezier *bezier, const QPointF &a, const QPointF &b, qreal alphaA, qreal alphaB, int path)
-{
-    if (qFuzzyCompare(alphaA, alphaB))
-        return;
-
-    if (comparePoints(a, b)) {
-        int v = insert(a);
-
-        addBezierEdge(bezier, v, v, alphaA, alphaB, path);
-    } else {
-        int va = insert(a);
-        int vb = insert(b);
-
-        addBezierEdge(bezier, va, vb, alphaA, alphaB, path);
-    }
-}
-
 int QWingedEdge::insert(const QPathVertex &vertex)
 {
     if (!m_vertices.isEmpty()) {
@@ -1429,37 +1134,12 @@ static void add(QPainterPath &path, const QWingedEdge &list, int edge, QPathEdge
     status.traversal = traversal;
     status.direction = QPathEdge::Forward;
 
-    const QBezier *bezier = 0;
-    qreal t0 = 1;
-    qreal t1 = 0;
-    bool forward = true;
-
     path.moveTo(*list.vertex(list.edge(edge)->first));
 
     do {
         const QPathEdge *ep = list.edge(status.edge);
 
-        if (ep->bezier != bezier || (bezier && t0 != ep->t1 && t1 != ep->t0)) {
-            if (bezier) {
-                QBezier sub = bezier->bezierOnInterval(t0, t1);
-
-                if (forward)
-                    path.cubicTo(sub.pt2(), sub.pt3(), sub.pt4());
-                else
-                    path.cubicTo(sub.pt3(), sub.pt2(), sub.pt1());
-            }
-
-            bezier = ep->bezier;
-            t0 = 1;
-            t1 = 0;
-            forward = status.direction == QPathEdge::Forward;
-        }
-
-        if (ep->bezier) {
-            t0 = qMin(t0, ep->t0);
-            t1 = qMax(t1, ep->t1);
-        } else
-            addLineTo(path, *list.vertex(ep->vertex(status.direction)));
+        addLineTo(path, *list.vertex(ep->vertex(status.direction)));
 
         if (status.traversal == QPathEdge::LeftTraversal)
             ep->flag &= ~16;
@@ -1468,14 +1148,6 @@ static void add(QPainterPath &path, const QWingedEdge &list, int edge, QPathEdge
 
         status = list.next(status);
     } while (status.edge != edge);
-
-    if (bezier) {
-        QBezier sub = bezier->bezierOnInterval(t0, t1);
-        if (forward)
-            path.cubicTo(sub.pt2(), sub.pt3(), sub.pt4());
-        else
-            path.cubicTo(sub.pt3(), sub.pt2(), sub.pt1());
-    }
 }
 
 void QWingedEdge::simplify()
@@ -1937,25 +1609,10 @@ bool QWingedEdge::isInside(qreal x, qreal y) const
         QPointF b = *vertex(ep->second);
 
         if ((a.y() < y && b.y() > y) || (a.y() > y && b.y() < y)) {
-            if (ep->bezier) {
-                qreal maxX = qMax(a.x(), qMax(b.x(), qMax(ep->bezier->x2, ep->bezier->x3)));
-                qreal minX = qMin(a.x(), qMin(b.x(), qMin(ep->bezier->x2, ep->bezier->x3)));
-
-                if (minX > x) {
-                    winding += w;
-                } else if (maxX > x) {
-                    const qreal t = ep->bezier->tForY(ep->t0, ep->t1, y);
-                    const qreal intersection = ep->bezier->pointAt(t).x();
-
-                    if (intersection > x)
-                        winding += w;
-                }
-            } else {
-                qreal intersectionX = a.x() + (b.x() - a.x()) * (y - a.y()) / (b.y() - a.y());
+            qreal intersectionX = a.x() + (b.x() - a.x()) * (y - a.y()) / (b.y() - a.y());
 
-                if (intersectionX > x)
-                    winding += w;
-            }
+            if (intersectionX > x)
+                winding += w;
         }
     }
 
@@ -1971,17 +1628,9 @@ static QVector<QCrossingEdge> findCrossings(const QWingedEdge &list, qreal y)
         QPointF b = *list.vertex(edge->second);
 
         if ((a.y() < y && b.y() > y) || (a.y() > y && b.y() < y)) {
-            if (edge->bezier) {
-                const qreal t = edge->bezier->tForY(edge->t0, edge->t1, y);
-                const qreal intersection = edge->bezier->pointAt(t).x();
-
-                const QCrossingEdge edge = { i, intersection };
-                crossings << edge;
-            } else {
-                const qreal intersection = a.x() + (b.x() - a.x()) * (y - a.y()) / (b.y() - a.y());
-                const QCrossingEdge edge = { i, intersection };
-                crossings << edge;
-            }
+            const qreal intersection = a.x() + (b.x() - a.x()) * (y - a.y()) / (b.y() - a.y());
+            const QCrossingEdge edge = { i, intersection };
+            crossings << edge;
         }
     }
     return crossings;
diff --git a/src/gui/painting/qpathclipper_p.h b/src/gui/painting/qpathclipper_p.h
index b42dc1d..7962400 100644
--- a/src/gui/painting/qpathclipper_p.h
+++ b/src/gui/painting/qpathclipper_p.h
@@ -151,10 +151,6 @@ public:
     qreal angle;
     qreal invAngle;
 
-    const QBezier *bezier;
-    qreal t0;
-    qreal t1;
-
     int next(Traversal traversal, Direction direction) const;
 
     void setNext(Traversal traversal, Direction direction, int next);
@@ -182,9 +178,8 @@ public:
     };
 
     struct Segment {
-        Segment(int pathId, int vertexA, int vertexB, int bezierIndex = -1)
+        Segment(int pathId, int vertexA, int vertexB)
             : path(pathId)
-            , bezier(bezierIndex)
             , va(vertexA)
             , vb(vertexB)
             , intersection(-1)
@@ -192,7 +187,6 @@ public:
         }
 
         int path;
-        int bezier;
 
         // vertices
         int va;
@@ -216,7 +210,6 @@ public:
 
     const Segment &segmentAt(int index) const;
     const QLineF lineAt(int index) const;
-    const QBezier *bezierAt(int index) const;
     const QRectF &elementBounds(int index) const;
     int pathId(int index) const;
 
@@ -231,7 +224,6 @@ public:
 private:
     QDataBuffer<QPointF> m_points;
     QDataBuffer<Segment> m_segments;
-    QDataBuffer<QBezier> m_beziers;
     QDataBuffer<Intersection> m_intersections;
 
     int m_pathId;
@@ -272,8 +264,8 @@ public:
 
     TraversalStatus next(const TraversalStatus &status) const;
 
-    int addEdge(const QPointF &a, const QPointF &b, const QBezier *bezier = 0, qreal t0 = 0, qreal t1 = 1);
-    int addEdge(int vertexA, int vertexB, const QBezier *bezier = 0, qreal t0 = 0, qreal t1 = 1);
+    int addEdge(const QPointF &a, const QPointF &b);
+    int addEdge(int vertexA, int vertexB);
 
     bool isInside(qreal x, qreal y) const;
 
@@ -285,11 +277,7 @@ private:
 
     void printNode(int i, FILE *handle);
 
-    QBezier bezierFromIndex(int index) const;
-
     void removeEdge(int ei);
-    void addBezierEdge(const QBezier *bezier, const QPointF &a, const QPointF &b, qreal alphaA, qreal alphaB, int path);
-    void addBezierEdge(const QBezier *bezier, int vertexA, int vertexB, qreal alphaA, qreal alphaB, int path);
 
     int insert(const QPathVertex &vertex);
     TraversalStatus findInsertStatus(int vertex, int edge) const;
@@ -312,9 +300,6 @@ inline QPathEdge::QPathEdge(int a, int b)
     , second(b)
     , angle(0)
     , invAngle(0)
-    , bezier(0)
-    , t0(0)
-    , t1(0)
 {
     m_next[0][0] = -1;
     m_next[1][0] = -1;
@@ -396,15 +381,6 @@ inline const QLineF QPathSegments::lineAt(int index) const
     return QLineF(m_points.at(segment.va), m_points.at(segment.vb));
 }
 
-inline const QBezier *QPathSegments::bezierAt(int index) const
-{
-    const Segment &segment = m_segments.at(index);
-    if (segment.bezier >= 0)
-        return &m_beziers.at(segment.bezier);
-    else
-        return 0;
-}
-
 inline const QRectF &QPathSegments::elementBounds(int index) const
 {
     return m_segments.at(index).bounds;
diff --git a/src/gui/painting/qwindowsurface_p.h b/src/gui/painting/qwindowsurface_p.h
index e6ee5f6..6171ae8 100644
--- a/src/gui/painting/qwindowsurface_p.h
+++ b/src/gui/painting/qwindowsurface_p.h
@@ -73,8 +73,12 @@ public:
     QWidget *window() const;
 
     virtual QPaintDevice *paintDevice() = 0;
-    virtual void flush(QWidget *widget, const QRegion &region,
-                       const QPoint &offset) = 0;
+
+    // 'widget' can be a child widget, in which case 'region' is in child widget coordinates and
+    // offset is the (child) widget's offset in relation to the window surface. On QWS, 'offset'
+    // can be larger than just the offset from the top-level widget as there may also be window
+    // decorations which are painted into the window surface.
+    virtual void flush(QWidget *widget, const QRegion &region, const QPoint &offset) = 0;
     virtual void setGeometry(const QRect &rect);
     QRect geometry() const;
 
diff --git a/src/gui/widgets/qmenu.cpp b/src/gui/widgets/qmenu.cpp
index f9b132e..907dd14 100644
--- a/src/gui/widgets/qmenu.cpp
+++ b/src/gui/widgets/qmenu.cpp
@@ -1834,7 +1834,7 @@ void QMenu::popup(const QPoint &p, QAction *atAction)
     QSize size = sizeHint();
     QRect screen;
 #ifndef QT_NO_GRAPHICSVIEW
-    bool isEmbedded = d->nearestGraphicsProxyWidget(this);
+    bool isEmbedded = !bypassGraphicsProxyWidget(this) && d->nearestGraphicsProxyWidget(this);
     if (isEmbedded)
         screen = d->popupGeometry(this);
     else
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 955a129..8460430 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -1807,27 +1807,6 @@ bool QGL2PaintEngineEx::begin(QPaintDevice *pdev)
     d->dirtyStencilRegion = QRect(0, 0, d->width, d->height);
     d->stencilClean = true;
 
-    switch (pdev->devType()) {
-    case QInternal::Pixmap:
-        d->deviceHasAlpha = static_cast<QPixmap *>(pdev)->hasAlphaChannel();
-        break;
-    case QInternal::FramebufferObject:
-        {
-            GLenum f = static_cast<QGLFramebufferObject *>(pdev)->format().internalTextureFormat();
-#ifndef QT_OPENGL_ES
-            d->deviceHasAlpha = (f != GL_RGB && f != GL_RGB5 && f != GL_RGB8);
-#else
-            d->deviceHasAlpha = (f == GL_RGBA);
-#endif
-        }
-        break;
-    default:
-        // widget, pbuffer
-        d->deviceHasAlpha = d->ctx->d_func()->reqFormat.alpha();
-        break;
-    }
-
-
     // Calling begin paint should make the correct context current. So, any
     // code which calls into GL or otherwise needs a current context *must*
     // go after beginPaint:
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
index 2ac2ca4..30f6634 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -290,7 +290,6 @@ public:
 
     bool needsSync;
     bool multisamplingAlwaysEnabled;
-    bool deviceHasAlpha;
 
     GLfloat depthRange[2];
 
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 394bcbc..72ed6be 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -3984,7 +3984,7 @@ bool QGLWidget::event(QEvent *e)
     if ((e->type() == QEvent::ParentChange) || (e->type() == QEvent::WindowStateChange)) {
         // The window may have been re-created during re-parent or state change - if so, the EGL
         // surface will need to be re-created.
-        d->recreateEglSurface(false);
+        d->recreateEglSurface();
     }
 #endif
 #elif defined(Q_WS_WIN)
diff --git a/src/opengl/qgl.h b/src/opengl/qgl.h
index b1e2ede..92a064f 100644
--- a/src/opengl/qgl.h
+++ b/src/opengl/qgl.h
@@ -432,6 +432,7 @@ private:
     friend class QGLFBOGLPaintDevice;
     friend class QGLPaintDevice;
     friend class QX11GLPixmapData;
+    friend class QX11GLSharedContexts;
 private:
     Q_DISABLE_COPY(QGLContext)
 };
diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index ee580a6..f19e394 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -195,7 +195,7 @@ public:
 #elif defined(Q_WS_X11)
     QGLOverlayWidget *olw;
 #ifndef QT_NO_EGL
-    void recreateEglSurface(bool force);
+    void recreateEglSurface();
     WId eglSurfaceWindowId;
 #endif
 #elif defined(Q_WS_MAC)
diff --git a/src/opengl/qgl_x11egl.cpp b/src/opengl/qgl_x11egl.cpp
index d67a3ea..c0b1515 100644
--- a/src/opengl/qgl_x11egl.cpp
+++ b/src/opengl/qgl_x11egl.cpp
@@ -335,24 +335,24 @@ void QGLWidget::setColormap(const QGLColormap &)
 {
 }
 
-// Re-creates the EGL surface if the window ID has changed or if force is true
-void QGLWidgetPrivate::recreateEglSurface(bool force)
+// Re-creates the EGL surface if the window ID has changed or if there isn't a surface
+void QGLWidgetPrivate::recreateEglSurface()
 {
     Q_Q(QGLWidget);
 
     Window currentId = q->winId();
 
-    if ( force || (currentId != eglSurfaceWindowId) ) {
-        // The window id has changed so we need to re-create the EGL surface
-        QEglContext *ctx = glcx->d_func()->eglContext;
-        EGLSurface surface = glcx->d_func()->eglSurface;
-        if (surface != EGL_NO_SURFACE)
-            ctx->destroySurface(surface); // Will force doneCurrent() if nec.
-        surface = ctx->createSurface(q);
-        if (surface == EGL_NO_SURFACE)
-            qWarning("Error creating EGL window surface: 0x%x", eglGetError());
-        glcx->d_func()->eglSurface = surface;
+    // If the window ID has changed since the surface was created, we need to delete the
+    // old surface before re-creating a new one. Note: This should not be the case as the
+    // surface should be deleted before the old window id.
+    if (glcx->d_func()->eglSurface != EGL_NO_SURFACE && (currentId != eglSurfaceWindowId)) {
+        qWarning("EGL surface for deleted window %x was not destroyed", eglSurfaceWindowId);
+        glcx->d_func()->destroyEglSurfaceForDevice();
+    }
 
+    if (glcx->d_func()->eglSurface == EGL_NO_SURFACE) {
+        qDebug("Re-creating the surface");
+        glcx->d_func()->eglSurface = glcx->d_func()->eglContext->createSurface(q);
         eglSurfaceWindowId = currentId;
     }
 }
diff --git a/src/opengl/qglpaintdevice.cpp b/src/opengl/qglpaintdevice.cpp
index 2d82222..e874e85 100644
--- a/src/opengl/qglpaintdevice.cpp
+++ b/src/opengl/qglpaintdevice.cpp
@@ -63,6 +63,22 @@ QGLPaintDevice::~QGLPaintDevice()
 {
 }
 
+int QGLPaintDevice::metric(QPaintDevice::PaintDeviceMetric metric) const
+{
+    switch(metric) {
+    case PdmWidth:
+        return size().width();
+    case PdmHeight:
+        return size().height();
+    case PdmDepth: {
+        const QGLFormat f = format();
+        return f.redBufferSize() + f.greenBufferSize() + f.blueBufferSize() + f.alphaBufferSize();
+    }
+    default:
+        qWarning("QGLPaintDevice::metric() - metric %d not known", metric);
+        return 0;
+    }
+}
 
 void QGLPaintDevice::beginPaint()
 {
diff --git a/src/opengl/qglpaintdevice_p.h b/src/opengl/qglpaintdevice_p.h
index 3d669da..04f9c3c 100644
--- a/src/opengl/qglpaintdevice_p.h
+++ b/src/opengl/qglpaintdevice_p.h
@@ -81,6 +81,7 @@ public:
     static QGLPaintDevice* getDevice(QPaintDevice*);
 
 protected:
+    int metric(QPaintDevice::PaintDeviceMetric metric) const;
     GLuint m_previousFBO;
     GLuint m_thisFBO;
 };
diff --git a/src/opengl/qpixmapdata_x11gl_egl.cpp b/src/opengl/qpixmapdata_x11gl_egl.cpp
index 4d726b6..58d34fc 100644
--- a/src/opengl/qpixmapdata_x11gl_egl.cpp
+++ b/src/opengl/qpixmapdata_x11gl_egl.cpp
@@ -62,123 +62,170 @@
 QT_BEGIN_NAMESPACE
 
 
-// On 16bpp systems, RGB & ARGB pixmaps are different bit-depths and therefore need
-// different contexts:
-
-Q_GLOBAL_STATIC(QEglContext, qt_x11gl_rgbContext);
-Q_GLOBAL_STATIC(QEglContext, qt_x11gl_argbContext);
-Q_GLOBAL_STATIC_WITH_ARGS(QGLContext, qt_x11gl_fake_shared_context, (QX11GLPixmapData::glFormat()));
+class QX11GLSharedContexts
+{
+public:
+    QX11GLSharedContexts()
+        : rgbContext(0)
+        , argbContext(0)
+        , sharedQGLContext(0)
+        , sharePixmap(0)
+    {
+        EGLint rgbConfigId;
+        EGLint argbConfigId;
+
+
+        do {
+            EGLConfig rgbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL, QEgl::Renderable);
+            EGLConfig argbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL,
+                                                       QEgl::Renderable | QEgl::Translucent);
+
+            eglGetConfigAttrib(QEgl::display(), rgbConfig, EGL_CONFIG_ID, &rgbConfigId);
+            eglGetConfigAttrib(QEgl::display(), argbConfig, EGL_CONFIG_ID, &argbConfigId);
+
+            rgbContext = new QEglContext;
+            rgbContext->setConfig(rgbConfig);
+            rgbContext->createContext();
 
-QEglContext* QX11GLPixmapData::rgbContext = 0;
-QEglContext* QX11GLPixmapData::argbContext = 0;
+            if (!rgbContext->isValid())
+                break;
 
+            // If the RGB & ARGB configs are the same, use the same egl context for both:
+            if (rgbConfig == argbConfig)
+                argbContext = rgbContext;
+
+            // Otherwise, create a seperate context to be used for ARGB pixmaps:
+            if (!argbContext) {
+                argbContext = new QEglContext;
+                argbContext->setConfig(argbConfig);
+                bool success = argbContext->createContext(rgbContext);
+                if (!success) {
+                    qWarning("QX11GLPixmapData - RGB & ARGB contexts aren't shared");
+                    success = argbContext->createContext();
+                    if (!success)
+                        argbContext = rgbContext; // Might work, worth a shot at least.
+                }
+            }
 
-bool QX11GLPixmapData::hasX11GLPixmaps()
-{
-    static bool checkedForX11Pixmaps = false;
-    static bool haveX11Pixmaps = false;
+            if (!argbContext->isValid())
+                break;
 
-    if (checkedForX11Pixmaps)
-        return haveX11Pixmaps;
+            // Create the pixmap which will be used to create the egl surface for the share QGLContext
+            QX11PixmapData *rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
+            rgbPixmapData->resize(8, 8);
+            rgbPixmapData->fill(Qt::red);
+            sharePixmap = new QPixmap(rgbPixmapData);
+            EGLSurface sharePixmapSurface = QEgl::createSurface(sharePixmap, rgbConfig);
+            rgbPixmapData->gl_surface = (void*)sharePixmapSurface;
+
+            // Create the actual QGLContext which will be used for sharing
+            sharedQGLContext = new QGLContext(QX11GLPixmapData::glFormat());
+            sharedQGLContext->d_func()->eglContext = rgbContext;
+            sharedQGLContext->d_func()->eglSurface = sharePixmapSurface;
+            sharedQGLContext->d_func()->valid = true;
+            qt_glformat_from_eglconfig(sharedQGLContext->d_func()->glFormat, rgbConfig);
+
+
+            valid = rgbContext->makeCurrent(sharePixmapSurface);
+
+            // If the ARGB & RGB configs are different, check ARGB works too:
+            if (argbConfig != rgbConfig) {
+                QX11PixmapData *argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
+                argbPixmapData->resize(8, 8);
+                argbPixmapData->fill(Qt::transparent); // Force ARGB
+                QPixmap argbPixmap(argbPixmapData); // destroys pixmap data when goes out of scope
+                EGLSurface argbPixmapSurface = QEgl::createSurface(&argbPixmap, argbConfig);
+                valid = argbContext->makeCurrent(argbPixmapSurface);
+                argbContext->doneCurrent();
+                eglDestroySurface(QEgl::display(), argbPixmapSurface);
+            }
 
-    checkedForX11Pixmaps = true;
+            if (!valid) {
+                qWarning() << "Unable to make pixmap surface current:" << QEgl::errorString();
+                break;
+            }
 
-    EGLint rgbConfigId;
-    EGLint argbConfigId;
+            // The pixmap surface destruction hooks are installed by QGLTextureCache, so we
+            // must make sure this is instanciated:
+            QGLTextureCache::instance();
+        } while(0);
 
-    do {
-        if (qgetenv("QT_USE_X11GL_PIXMAPS").isEmpty())
-            break;
 
-        EGLConfig rgbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL, QEgl::Renderable);
-        EGLConfig argbConfig = QEgl::defaultConfig(QInternal::Pixmap, QEgl::OpenGL,
-                                                   QEgl::Renderable | QEgl::Translucent);
+        if (!valid)
+            cleanup();
+        else
+            qDebug("Using QX11GLPixmapData with EGL config %d for ARGB and config %d for RGB", argbConfigId, rgbConfigId);
 
-        eglGetConfigAttrib(QEgl::display(), rgbConfig, EGL_CONFIG_ID, &rgbConfigId);
-        eglGetConfigAttrib(QEgl::display(), argbConfig, EGL_CONFIG_ID, &argbConfigId);
+    }
 
-        if (!rgbContext) {
-            rgbContext = qt_x11gl_rgbContext();
-            rgbContext->setConfig(rgbConfig);
-            rgbContext->createContext();
+    void cleanup() {
+        if (sharedQGLContext) {
+            delete sharedQGLContext;
+            sharedQGLContext = 0;
         }
+        if (argbContext && argbContext != rgbContext)
+            delete argbContext;
+        argbContext = 0;
 
-        if (!rgbContext->isValid())
-            break;
-
-        // If the configs are the same, use the same egl contexts:
-        if (rgbConfig == argbConfig)
-            argbContext = rgbContext;
-
-        if (!argbContext) {
-            argbContext = qt_x11gl_argbContext();
-            argbContext->setConfig(argbConfig);
-            bool success = argbContext->createContext(rgbContext);
-            if (!success) {
-                qWarning("QX11GLPixmapData - RGB & ARGB contexts aren't shared");
-                success = argbContext->createContext();
-                if (!success)
-                    argbContext = rgbContext; // Might work, worth a shot at least.
-            }
+        if (rgbContext) {
+            delete rgbContext;
+            rgbContext = 0;
         }
 
-        if (!argbContext->isValid())
-            break;
-
-        {
-            QX11PixmapData *argbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
-            argbPixmapData->resize(100, 100);
-            argbPixmapData->fill(Qt::transparent); // Force ARGB
-            QPixmap argbPixmap(argbPixmapData);
-            EGLSurface argbPixmapSurface = QEgl::createSurface(&argbPixmap, argbConfig);
-            haveX11Pixmaps = argbContext->makeCurrent(argbPixmapSurface);
-            argbContext->doneCurrent();
-            eglDestroySurface(QEgl::display(), argbPixmapSurface);
+        // Deleting the QPixmap will fire the pixmap destruction cleanup hooks which in turn
+        // will destroy the egl surface:
+        if (sharePixmap) {
+            delete sharePixmap;
+            sharePixmap = 0;
         }
+    }
 
-        if (!haveX11Pixmaps) {
-            qWarning() << "Unable to make pixmap surface current:" << QEgl::errorString();
-            break;
-        }
+    bool isValid() { return valid;}
 
-        // If the ARGB & RGB configs are different, check RGB too:
-        if (argbConfig != rgbConfig) {
-            QX11PixmapData *rgbPixmapData = new QX11PixmapData(QPixmapData::PixmapType);
-            rgbPixmapData->resize(100, 100);
-            rgbPixmapData->fill(Qt::red);
+    // On 16bpp systems, RGB & ARGB pixmaps are different bit-depths and therefore need
+    // different contexts:
+    QEglContext *rgbContext;
+    QEglContext *argbContext;
 
-            QPixmap rgbPixmap(rgbPixmapData);
-            EGLSurface rgbPixmapSurface = QEgl::createSurface(&rgbPixmap, rgbConfig);
-            haveX11Pixmaps = rgbContext->makeCurrent(rgbPixmapSurface);
-            rgbContext->doneCurrent();
-            eglDestroySurface(QEgl::display(), rgbPixmapSurface);
+    // The share context wraps the rgbContext and is used as the master of the context share
+    // group. As all other contexts will have the same egl context (or a shared one if rgb != argb)
+    // all QGLContexts will actually be sharing and can be in the same context group.
+    QGLContext  *sharedQGLContext;
+private:
+    QPixmap     *sharePixmap;
+    bool         valid;
+};
 
-            if (!haveX11Pixmaps) {
-                qWarning() << "Unable to make pixmap config current:" << QEgl::errorString();
-                break;
-            }
-        }
+static void qt_cleanup_x11gl_share_contexts();
 
-        // The pixmap surface destruction hooks are installed by QGLTextureCache, so we
-        // must make sure this is instanciated:
-        QGLTextureCache::instance();
-    } while (0);
+Q_GLOBAL_STATIC_WITH_INITIALIZER(QX11GLSharedContexts, qt_x11gl_share_contexts,
+                                 {
+                                     qAddPostRoutine(qt_cleanup_x11gl_share_contexts);
+                                 })
 
-    if (!haveX11Pixmaps) {
-        if (argbContext && (argbContext != rgbContext)) {
-            delete argbContext;
-            argbContext = 0;
-        }
-        if (rgbContext) {
-            delete rgbContext;
-            rgbContext = 0;
-        }
-    }
+static void qt_cleanup_x11gl_share_contexts()
+{
+    qt_x11gl_share_contexts()->cleanup();
+}
 
-    if (haveX11Pixmaps)
-        qDebug("Using QX11GLPixmapData with EGL config %d for ARGB and config %d for RGB", argbConfigId, rgbConfigId);
-    else
-        qDebug("QX11GLPixmapData is *NOT* being used");
+
+QX11GLSharedContexts* QX11GLPixmapData::sharedContexts()
+{
+    return qt_x11gl_share_contexts();
+}
+
+bool QX11GLPixmapData::hasX11GLPixmaps()
+{
+    static bool checkedForX11Pixmaps = false;
+    static bool haveX11Pixmaps = false;
+
+    if (checkedForX11Pixmaps)
+        return haveX11Pixmaps;
+
+    checkedForX11Pixmaps = true;
+
+    if (!qgetenv("QT_USE_X11GL_PIXMAPS").isEmpty() && sharedContexts()->isValid())
+        haveX11Pixmaps = true;
 
     return haveX11Pixmaps;
 }
@@ -264,14 +311,14 @@ QPaintEngine* QX11GLPixmapData::paintEngine() const
     if (!ctx) {
         ctx = new QGLContext(glFormat());
         Q_ASSERT(ctx->d_func()->eglContext == 0);
-        ctx->d_func()->eglContext = hasAlphaChannel() ? argbContext : rgbContext;
+        ctx->d_func()->eglContext = hasAlphaChannel() ? sharedContexts()->argbContext : sharedContexts()->rgbContext;
 
         // While we use a seperate QGLContext for each pixmap, the underlying QEglContext is
         // the same. So we must use a "fake" QGLContext and fool the texture cache into thinking
         // each pixmap's QGLContext is sharing with this central one. The only place this is
         // going to fail is where we the underlying EGL RGB and ARGB contexts aren't sharing.
         ctx->d_func()->sharing = true;
-        QGLContextGroup::addShare(ctx, qt_x11gl_fake_shared_context());
+        QGLContextGroup::addShare(ctx, sharedContexts()->sharedQGLContext);
 
         // Update the glFormat for the QGLContext:
         qt_glformat_from_eglconfig(ctx->d_func()->glFormat, ctx->d_func()->eglContext->config());
@@ -336,12 +383,6 @@ void QX11GLPixmapData::beginPaint()
     QGLPaintDevice::beginPaint();
 }
 
-void QX11GLPixmapData::endPaint()
-{
-    glFinish();
-    QGLPaintDevice::endPaint();
-}
-
 QGLContext* QX11GLPixmapData::context() const
 {
     return ctx;
diff --git a/src/opengl/qpixmapdata_x11gl_p.h b/src/opengl/qpixmapdata_x11gl_p.h
index 8681336..2d1336b 100644
--- a/src/opengl/qpixmapdata_x11gl_p.h
+++ b/src/opengl/qpixmapdata_x11gl_p.h
@@ -65,6 +65,8 @@
 
 QT_BEGIN_NAMESPACE
 
+class QX11GLSharedContexts;
+
 class QX11GLPixmapData : public QX11PixmapData, public QGLPaintDevice
 {
 public:
@@ -79,17 +81,13 @@ public:
     // Re-implemented from QGLPaintDevice
     QPaintEngine* paintEngine() const; // Also re-implements QX11PixmapData::paintEngine
     void beginPaint();
-    void endPaint();
     QGLContext* context() const;
     QSize size() const;
 
     static bool hasX11GLPixmaps();
     static QGLFormat glFormat();
+    static QX11GLSharedContexts* sharedContexts();
 
-#ifndef QT_NO_EGL
-    static QEglContext* rgbContext;
-    static QEglContext* argbContext;
-#endif
 private:
     mutable QGLContext* ctx;
 };
diff --git a/src/opengl/qwindowsurface_gl.cpp b/src/opengl/qwindowsurface_gl.cpp
index ca88de3..b693245 100644
--- a/src/opengl/qwindowsurface_gl.cpp
+++ b/src/opengl/qwindowsurface_gl.cpp
@@ -97,6 +97,7 @@ extern Q_GUI_EXPORT bool qt_win_owndc_required;
 QGLGraphicsSystem::QGLGraphicsSystem()
     : QGraphicsSystem()
 {
+    QGLWindowSurface::surfaceFormat.setSampleBuffers(true);
 #if defined(Q_WS_X11) && !defined(QT_OPENGL_ES)
     // only override the system defaults if the user hasn't already
     // picked a visual
diff --git a/src/opengl/qwindowsurface_x11gl.cpp b/src/opengl/qwindowsurface_x11gl.cpp
index 7befe03..3de6cae 100644
--- a/src/opengl/qwindowsurface_x11gl.cpp
+++ b/src/opengl/qwindowsurface_x11gl.cpp
@@ -72,63 +72,66 @@ extern void *qt_getClipRects(const QRegion &r, int &num); // in qpaintengine_x11
 
 void QX11GLWindowSurface::flush(QWidget *widget, const QRegion &widgetRegion, const QPoint &offset)
 {
-//    qDebug("QX11GLWindowSurface::flush()");
-    QTime startTime = QTime::currentTime();
+    // We don't need to know the widget which initiated the flush. Instead we just use the offset
+    // to translate the widgetRegion:
+    Q_UNUSED(widget);
+
     if (m_backBuffer.isNull()) {
-        qDebug("QHarmattanWindowSurface::flush() - backBuffer is null, not flushing anything");
+        qDebug("QX11GLWindowSurface::flush() - backBuffer is null, not flushing anything");
         return;
     }
 
-    QPoint widgetOffset = qt_qwidget_data(widget)->wrect.topLeft();
-    QRegion windowRegion(widgetRegion);
-    QRect boundingRect = widgetRegion.boundingRect();
-    if (!widgetOffset.isNull())
-        windowRegion.translate(-widgetOffset);
-    QRect windowBoundingRect = windowRegion.boundingRect();
+    Q_ASSERT(window()->size() != m_backBuffer.size());
 
-    int rectCount;
-    XRectangle *rects = (XRectangle *)qt_getClipRects(windowRegion, rectCount);
-    if (rectCount <= 0)
-        return;
-//         qDebug() << "XSetClipRectangles";
-//         for  (int i = 0; i < num; ++i)
-//             qDebug() << ' ' << i << rects[i].x << rects[i].x << rects[i].y << rects[i].width << rects[i].height;
+    // Wait for all GL rendering to the back buffer pixmap to complete before trying to
+    // copy it to the window. We do this by making sure the pixmap's context is current
+    // and then call eglWaitClient. The EGL 1.4 spec says eglWaitClient doesn't have to
+    // block, just that "All rendering calls...are guaranteed to be executed before native
+    // rendering calls". This makes it potentially less expensive than glFinish.
+    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data())->context();
+    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
+        ctx->makeCurrent();
+    eglWaitClient();
 
     if (m_windowGC == 0) {
-        m_windowGC = XCreateGC(X11->display, m_window->handle(), 0, 0);
-        XSetGraphicsExposures(X11->display, m_windowGC, False);
+        XGCValues attribs;
+        attribs.graphics_exposures = False;
+        m_windowGC = XCreateGC(X11->display, m_window->handle(), GCGraphicsExposures, &attribs);
     }
 
+    int rectCount;
+    XRectangle *rects = (XRectangle *)qt_getClipRects(widgetRegion, rectCount);
+    if (rectCount <= 0)
+        return;
+
     XSetClipRectangles(X11->display, m_windowGC, 0, 0, rects, rectCount, YXBanded);
+
+    QRect dirtyRect = widgetRegion.boundingRect().translated(-offset);
     XCopyArea(X11->display, m_backBuffer.handle(), m_window->handle(), m_windowGC,
-              boundingRect.x() + offset.x(), boundingRect.y() + offset.y(),
-              boundingRect.width(), boundingRect.height(),
-              windowBoundingRect.x(), windowBoundingRect.y());
-
-    QX11GLPixmapData* pmd = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data());
-    Q_ASSERT(pmd->context());
-    pmd->context()->makeCurrent();
-    XSync(X11->display, False);
+              dirtyRect.x(), dirtyRect.y(), dirtyRect.width(), dirtyRect.height(),
+              dirtyRect.x(), dirtyRect.y());
+
+    // Make sure the blit of the update from the back buffer to the window completes
+    // before allowing rendering to start again to the back buffer. Otherwise the GPU
+    // might start rendering to the back buffer again while the blit takes place.
     eglWaitNative(EGL_CORE_NATIVE_ENGINE);
 }
 
 void QX11GLWindowSurface::setGeometry(const QRect &rect)
 {
     if (rect.width() > m_backBuffer.size().width() || rect.height() > m_backBuffer.size().height()) {
-        QSize newSize = rect.size();
-//        QSize newSize(1024,512);
-        qDebug() << "QX11GLWindowSurface::setGeometry() - creating a pixmap of size" << newSize;
         QX11GLPixmapData *pd = new QX11GLPixmapData;
+        QSize newSize = rect.size();
         pd->resize(newSize.width(), newSize.height());
         m_backBuffer = QPixmap(pd);
         if (window()->testAttribute(Qt::WA_TranslucentBackground))
             m_backBuffer.fill(Qt::transparent);
+        if (m_pixmapGC) {
+            XFreeGC(X11->display, m_pixmapGC);
+            m_pixmapGC = 0;
+        }
     }
 
-//    if (gc)
-//        XFreeGC(X11->display, gc);
-//    gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);
-//    XSetGraphicsExposures(X11->display, gc, False);
     QWindowSurface::setGeometry(rect);
 }
 
@@ -139,10 +142,10 @@ bool QX11GLWindowSurface::scroll(const QRegion &area, int dx, int dy)
 
     Q_ASSERT(m_backBuffer.data_ptr()->classId() == QPixmapData::X11Class);
 
-    QX11GLPixmapData* pmd = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data());
-    Q_ASSERT(pmd->context());
-    pmd->context()->makeCurrent();
-    glFinish();
+    // Make sure all GL rendering is complete before starting the scroll operation:
+    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.data_ptr().data())->context();
+    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
+        ctx->makeCurrent();
     eglWaitClient();
 
     if (!m_pixmapGC)
@@ -154,24 +157,57 @@ bool QX11GLWindowSurface::scroll(const QRegion &area, int dx, int dy)
                   rect.x()+dx, rect.y()+dy);
     }
 
-    XSync(X11->display, False);
+    // Make sure the scroll operation is complete before allowing GL rendering to resume
     eglWaitNative(EGL_CORE_NATIVE_ENGINE);
 
     return true;
 }
 
-/*
-void QX11GLWindowSurface::beginPaint(const QRegion &region)
-{
-}
 
-void QX11GLWindowSurface::endPaint(const QRegion &region)
+QPixmap QX11GLWindowSurface::grabWidget(const QWidget *widget, const QRect& rect) const
 {
-}
+    if (!widget || m_backBuffer.isNull())
+        return QPixmap();
 
-QImage *QX11GLWindowSurface::buffer(const QWidget *widget)
-{
+    QRect srcRect;
+
+    // make sure the rect is inside the widget & clip to widget's rect
+    if (!rect.isEmpty())
+        srcRect = rect & widget->rect();
+    else
+        srcRect = widget->rect();
+
+    if (srcRect.isEmpty())
+        return QPixmap();
+
+    // If it's a child widget we have to translate the coordinates
+    if (widget != window())
+        srcRect.translate(widget->mapTo(window(), QPoint(0, 0)));
+
+    QPixmap::x11SetDefaultScreen(widget->x11Info().screen());
+
+    QX11PixmapData *pmd = new QX11PixmapData(QPixmapData::PixmapType);
+    pmd->resize(srcRect.width(), srcRect.height());
+    QPixmap px(pmd);
+
+    GC tmpGc = XCreateGC(X11->display, m_backBuffer.handle(), 0, 0);
+
+    // Make sure all GL rendering is complete before copying the window
+    QGLContext* ctx = static_cast<QX11GLPixmapData*>(m_backBuffer.pixmapData())->context();
+    if (QGLContext::currentContext() != ctx && ctx && ctx->isValid())
+        ctx->makeCurrent();
+    eglWaitClient();
+
+    // Copy srcRect from the backing store to the new pixmap
+    XSetGraphicsExposures(X11->display, tmpGc, False);
+    XCopyArea(X11->display, m_backBuffer.handle(), px.handle(), tmpGc,
+              srcRect.x(), srcRect.y(), srcRect.width(), srcRect.height(), 0, 0);
+    XFreeGC(X11->display, tmpGc);
+
+    // Wait until the copy has finised before allowing more rendering into the back buffer
+    eglWaitNative(EGL_CORE_NATIVE_ENGINE);
+
+    return px;
 }
-*/
 
 QT_END_NAMESPACE
diff --git a/src/opengl/qwindowsurface_x11gl_p.h b/src/opengl/qwindowsurface_x11gl_p.h
index 3a952e8..4d493d0 100644
--- a/src/opengl/qwindowsurface_x11gl_p.h
+++ b/src/opengl/qwindowsurface_x11gl_p.h
@@ -68,6 +68,7 @@ public:
     void flush(QWidget *widget, const QRegion &region, const QPoint &offset);
     void setGeometry(const QRect &rect);
     bool scroll(const QRegion &area, int dx, int dy);
+    QPixmap grabWidget(const QWidget *widget, const QRect& rectangle = QRect()) const;
 
 private:
     GC      m_windowGC;
diff --git a/src/s60installs/bwins/QtGuiu.def b/src/s60installs/bwins/QtGuiu.def
index a948f73..1bcc619 100644
--- a/src/s60installs/bwins/QtGuiu.def
+++ b/src/s60installs/bwins/QtGuiu.def
@@ -4417,8 +4417,8 @@ EXPORTS
 	?findData@QComboBox@@QBEHABVQVariant@@HV?$QFlags@W4MatchFlag@Qt@@@@@Z @ 4416 NONAME ; int QComboBox::findData(class QVariant const &, int, class QFlags<enum Qt::MatchFlag>) const
 	?findFont@QFontDatabase@@CAPAVQFontEngine@@HPBVQFontPrivate@@ABUQFontDef@@@Z @ 4417 NONAME ; class QFontEngine * QFontDatabase::findFont(int, class QFontPrivate const *, struct QFontDef const &)
 	?findInMask@QLineControl@@ABEHH_N0VQChar@@@Z @ 4418 NONAME ; int QLineControl::findInMask(int, bool, bool, class QChar) const
-	?findIntersections@QBezier@@SA?AV?$QVector@U?$QPair@MM@@@@ABV1@0@Z @ 4419 NONAME ; class QVector<struct QPair<float, float> > QBezier::findIntersections(class QBezier const &, class QBezier const &)
-	?findIntersections@QBezier@@SA_NABV1@0PAV?$QVector@U?$QPair@MM@@@@@Z @ 4420 NONAME ; bool QBezier::findIntersections(class QBezier const &, class QBezier const &, class QVector<struct QPair<float, float> > *)
+	?findIntersections@QBezier@@SA?AV?$QVector@U?$QPair@MM@@@@ABV1@0@Z @ 4419 NONAME ABSENT ; class QVector<struct QPair<float, float> > QBezier::findIntersections(class QBezier const &, class QBezier const &)
+	?findIntersections@QBezier@@SA_NABV1@0PAV?$QVector@U?$QPair@MM@@@@@Z @ 4420 NONAME ABSENT ; bool QBezier::findIntersections(class QBezier const &, class QBezier const &, class QVector<struct QPair<float, float> > *)
 	?findItem@QTextEngine@@QBEHH@Z @ 4421 NONAME ; int QTextEngine::findItem(int) const
 	?findItems@QListWidget@@QBE?AV?$QList@PAVQListWidgetItem@@@@ABVQString@@V?$QFlags@W4MatchFlag@Qt@@@@@Z @ 4422 NONAME ; class QList<class QListWidgetItem *> QListWidget::findItems(class QString const &, class QFlags<enum Qt::MatchFlag>) const
 	?findItems@QStandardItemModel@@QBE?AV?$QList@PAVQStandardItem@@@@ABVQString@@V?$QFlags@W4MatchFlag@Qt@@@@H@Z @ 4423 NONAME ; class QList<class QStandardItem *> QStandardItemModel::findItems(class QString const &, class QFlags<enum Qt::MatchFlag>, int) const
@@ -10501,7 +10501,7 @@ EXPORTS
 	?speed@QMovie@@QBEHXZ @ 10500 NONAME ; int QMovie::speed(void) const
 	?split@QBezier@@QBEXPAV1@0@Z @ 10501 NONAME ; void QBezier::split(class QBezier *, class QBezier *) const
 	?split@QItemSelection@@SAXABVQItemSelectionRange@@0PAV1@@Z @ 10502 NONAME ; void QItemSelection::split(class QItemSelectionRange const &, class QItemSelectionRange const &, class QItemSelection *)
-	?splitAtIntersections@QBezier@@QAE?AV?$QVector@V?$QList@VQBezier@@@@@@AAV1@@Z @ 10503 NONAME ; class QVector<class QList<class QBezier> > QBezier::splitAtIntersections(class QBezier &)
+	?splitAtIntersections@QBezier@@QAE?AV?$QVector@V?$QList@VQBezier@@@@@@AAV1@@Z @ 10503 NONAME ABSENT ; class QVector<class QList<class QBezier> > QBezier::splitAtIntersections(class QBezier &)
 	?splitCell@QTextTable@@QAEXHHHH@Z @ 10504 NONAME ; void QTextTable::splitCell(int, int, int, int)
 	?splitDockWidget@QMainWindow@@QAEXPAVQDockWidget@@0W4Orientation@Qt@@@Z @ 10505 NONAME ; void QMainWindow::splitDockWidget(class QDockWidget *, class QDockWidget *, enum Qt::Orientation)
 	?splitItem@QTextEngine@@ABEXHH@Z @ 10506 NONAME ; void QTextEngine::splitItem(int, int) const
diff --git a/src/s60installs/eabi/QtGuiu.def b/src/s60installs/eabi/QtGuiu.def
index cadcf59..a735de1 100644
--- a/src/s60installs/eabi/QtGuiu.def
+++ b/src/s60installs/eabi/QtGuiu.def
@@ -5907,9 +5907,9 @@ EXPORTS
 	_ZN7QActionD1Ev @ 5906 NONAME
 	_ZN7QActionD2Ev @ 5907 NONAME
 	_ZN7QBezier10fromPointsERK7QPointFS2_S2_S2_ @ 5908 NONAME
-	_ZN7QBezier17findIntersectionsERKS_S1_ @ 5909 NONAME
-	_ZN7QBezier17findIntersectionsERKS_S1_P7QVectorI5QPairIffEE @ 5910 NONAME
-	_ZN7QBezier20splitAtIntersectionsERS_ @ 5911 NONAME
+	_ZN7QBezier17findIntersectionsERKS_S1_ @ 5909 NONAME ABSENT
+	_ZN7QBezier17findIntersectionsERKS_S1_P7QVectorI5QPairIffEE @ 5910 NONAME ABSENT
+	_ZN7QBezier20splitAtIntersectionsERS_ @ 5911 NONAME ABSENT
 	_ZN7QBitmap8fromDataERK5QSizePKhN6QImage6FormatE @ 5912 NONAME
 	_ZN7QBitmap9fromImageERK6QImage6QFlagsIN2Qt19ImageConversionFlagEE @ 5913 NONAME
 	_ZN7QBitmapC1ERK5QSize @ 5914 NONAME
diff --git a/tests/auto/qpainterpath/tst_qpainterpath.cpp b/tests/auto/qpainterpath/tst_qpainterpath.cpp
index a40fe0f..d0cddda 100644
--- a/tests/auto/qpainterpath/tst_qpainterpath.cpp
+++ b/tests/auto/qpainterpath/tst_qpainterpath.cpp
@@ -517,7 +517,6 @@ void tst_QPainterPath::testSimplified_data()
     QTest::addColumn<int>("elements");
 
     QTest::newRow("rect") << rectPath(0, 0, 10, 10) << 5;
-    QTest::newRow("ellipse") << ellipsePath(0, 0, 10, 10) << 13;
 
     QPainterPath twoRects = rectPath(0, 0, 10, 10);
     twoRects.addPath(rectPath(5, 0, 10, 10));
diff --git a/tests/auto/qpathclipper/tst_qpathclipper.cpp b/tests/auto/qpathclipper/tst_qpathclipper.cpp
index db5a13e..4dc12cb 100644
--- a/tests/auto/qpathclipper/tst_qpathclipper.cpp
+++ b/tests/auto/qpathclipper/tst_qpathclipper.cpp
@@ -285,46 +285,6 @@ static QPainterPath samplePath10()
     return path;
 }
 
-static QPainterPath samplePath11()
-{
-    QPainterPath path;
-    path.moveTo(QPointF(165.71429, 338.79076));
-    path.lineTo(QPointF(227.74288, 338.79076));
-    path.cubicTo(QPointF(232.95048, 338.79076),
-                 QPointF(237.14288, 342.88102),
-                 QPointF(237.14288, 347.96176));
-    path.lineTo(QPointF(237.14288, 366.76261));
-    path.cubicTo(QPointF(237.14288, 371.84335),
-                 QPointF(232.95048, 375.93361),
-                 QPointF(227.74288, 375.93361));
-    path.lineTo(QPointF(165.7142905131896, 375.93361));
-    path.lineTo(QPointF(165.71429, 338.79076));
-    return path;
-}
-static QPainterPath samplePath12()
-{
-    QPainterPath path;
-    path.moveTo(QPointF(333.297085225735, 61.53486494396167));
-    path.cubicTo(QPointF(339.851755668807, 65.26555884471786),
-                 QPointF(346.7164458828328, 69.04482864715078),
-                 QPointF(353.4159970843586, 72.56059416636147));
-    path.cubicTo(QPointF(353.4166971116034, 72.56155590850551),
-                 QPointF(353.4173961086004, 72.56251809989483),
-                 QPointF(353.4180950127331, 72.56348028832946));
-    path.cubicTo(QPointF(342.4340366381152, 76.42344228577481),
-                 QPointF(317.0596805768079, 94.67086588954379),
-                 QPointF(309.78055, 101.00195));
-    path.cubicTo(QPointF(286.0370715501102, 121.6530659984711),
-                 QPointF(272.7748256344584, 134.1525788344904),
-                 QPointF(250.7436468364447, 150.4434491585085));
-    path.lineTo(QPointF(247.03629, 146.56585));
-    path.lineTo(QPointF(240.71086, 91.501867));
-    path.cubicTo(QPointF(240.71086, 91.501867),
-                 QPointF(305.6382515924416, 62.21715375368672),
-                 QPointF(333.297085225735, 61.53486494396167));
-    return path;
-}
-
 static QPainterPath samplePath13()
 {
     QPainterPath path;
@@ -412,16 +372,6 @@ void tst_QPathClipper::clip_data()
                                  << QPathClipper::BoolAnd
                                  << samplePath10();
 
-    QTest::newRow( "simple11" )  << Paths::frame2()*QTransform().translate(40, 235)
-                                 << Paths::frame1()
-                                 << QPathClipper::BoolAnd
-                                 << samplePath11();
-
-    QTest::newRow( "intersection_at_edge" )  << Paths::lips()
-                                             << Paths::mailbox()*QTransform().translate(-85, 34)
-                                             << QPathClipper::BoolAnd
-                                             << samplePath12();
-
     QTest::newRow( "simple_move_to1" )  << Paths::rect4()
                                        << Paths::rect2() * QTransform().translate(-20, 50)
                                        << QPathClipper::BoolAnd