Merge commit 'qt/master'

Conflicts:
	examples/painting/svgviewer/files/bubbles.svg
	src/corelib/kernel/qobject.cpp
	src/network/kernel/qhostinfo.cpp
	tests/auto/qhostinfo/tst_qhostinfo.cpp

5 files changed, 54 insertions, 21 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 4f64c2a..88fac14 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -1023,7 +1023,7 @@ void QGraphicsItemPrivate::setParentItemHelper(QGraphicsItem *newParent)
     }
 
     // Resolve depth.
-    resolveDepth(parent ? parent->d_ptr->depth : -1);
+    invalidateDepthRecursively();
     dirtySceneTransform = 1;
 
     // Restore the sub focus chain.
@@ -4413,14 +4413,42 @@ bool QGraphicsItemPrivate::discardUpdateRequest(bool ignoreClipping, bool ignore
 
 /*!
     \internal
+*/
+int QGraphicsItemPrivate::depth() const
+{
+    if (itemDepth == -1)
+        const_cast<QGraphicsItemPrivate *>(this)->resolveDepth();
+
+    return itemDepth;
+}
 
-    Resolves the stacking depth of this object and all its children.
+/*!
+    \internal
 */
-void QGraphicsItemPrivate::resolveDepth(int parentDepth)
+void QGraphicsItemPrivate::invalidateDepthRecursively()
 {
-    depth = parentDepth + 1;
+    if (itemDepth == -1)
+        return;
+
+    itemDepth = -1;
     for (int i = 0; i < children.size(); ++i)
-        children.at(i)->d_ptr->resolveDepth(depth);
+        children.at(i)->d_ptr->invalidateDepthRecursively();
+}
+
+/*!
+    \internal
+
+    Resolves the stacking depth of this object and all its ancestors.
+*/
+void QGraphicsItemPrivate::resolveDepth()
+{
+    if (!parent)
+        itemDepth = 0;
+    else {
+        if (parent->d_ptr->itemDepth == -1)
+            parent->d_ptr->resolveDepth();
+        itemDepth = parent->d_ptr->itemDepth + 1;
+    }
 }
 
 /*!
@@ -5590,8 +5618,8 @@ QGraphicsItem *QGraphicsItem::commonAncestorItem(const QGraphicsItem *other) con
         return const_cast<QGraphicsItem *>(this);
     const QGraphicsItem *thisw = this;
     const QGraphicsItem *otherw = other;
-    int thisDepth = d_ptr->depth;
-    int otherDepth = other->d_ptr->depth;
+    int thisDepth = d_ptr->depth();
+    int otherDepth = other->d_ptr->depth();
     while (thisDepth > otherDepth) {
         thisw = thisw->d_ptr->parent;
         --thisDepth;
@@ -6601,7 +6629,7 @@ void QGraphicsItem::prepareGeometryChange()
         // if someone is connected to the changed signal or the scene has no views.
         // Note that this has to be done *after* markDirty to ensure that
         // _q_processDirtyItems is called before _q_emitUpdated.
-	if ((scenePrivate->connectedSignals[0] & scenePrivate->changedSignalMask)
+	if (scenePrivate->isSignalConnected(scenePrivate->changedSignalIndex)
             || scenePrivate->views.isEmpty()) {
             if (d_ptr->hasTranslateOnlySceneTransform()) {
                 d_ptr->scene->update(boundingRect().translated(d_ptr->sceneTransform.dx(),
diff --git a/src/gui/graphicsview/qgraphicsitem_p.h b/src/gui/graphicsview/qgraphicsitem_p.h
index 24326f6..6456ae7 100644
--- a/src/gui/graphicsview/qgraphicsitem_p.h
+++ b/src/gui/graphicsview/qgraphicsitem_p.h
@@ -123,7 +123,7 @@ public:
         transformData(0),
         index(-1),
         siblingIndex(-1),
-        depth(0),
+        itemDepth(-1),
         focusProxy(0),
         subFocusItem(0),
         imHints(Qt::ImhNone),
@@ -209,7 +209,9 @@ public:
     void setEnabledHelper(bool newEnabled, bool explicitly, bool update = true);
     bool discardUpdateRequest(bool ignoreClipping = false, bool ignoreVisibleBit = false,
                               bool ignoreDirtyBit = false, bool ignoreOpacity = false) const;
-    void resolveDepth(int parentDepth);
+    int depth() const;
+    void invalidateDepthRecursively();
+    void resolveDepth();
     void addChild(QGraphicsItem *child);
     void removeChild(QGraphicsItem *child);
     void setParentItemHelper(QGraphicsItem *parent);
@@ -419,7 +421,7 @@ public:
     QTransform sceneTransform;
     int index;
     int siblingIndex;
-    int depth;
+    int itemDepth;  // Lazily calculated when calling depth().
     QGraphicsItem *focusProxy;
     QList<QGraphicsItem **> focusProxyRefs;
     QGraphicsItem *subFocusItem;
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index a2a92b8..a8db74d 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -265,12 +265,13 @@ static void _q_hoverFromMouseEvent(QGraphicsSceneHoverEvent *hover, const QGraph
     hover->setAccepted(mouseEvent->isAccepted());
 }
 
+int QGraphicsScenePrivate::changedSignalIndex;
+
 /*!
     \internal
 */
 QGraphicsScenePrivate::QGraphicsScenePrivate()
-    : changedSignalMask(0),
-      indexMethod(QGraphicsScene::BspTreeIndex),
+    : indexMethod(QGraphicsScene::BspTreeIndex),
       index(0),
       lastItemCount(0),
       hasSceneRect(false),
@@ -311,7 +312,9 @@ void QGraphicsScenePrivate::init()
     index = new QGraphicsSceneBspTreeIndex(q);
 
     // Keep this index so we can check for connected slots later on.
-    changedSignalMask = (1 << q->metaObject()->indexOfSignal("changed(QList<QRectF>)"));
+    if (!changedSignalIndex) {
+        changedSignalIndex = signalIndex("changed(QList<QRectF>)");
+    }
     qApp->d_func()->scene_list.append(q);
     q->update();
 }
@@ -343,7 +346,7 @@ void QGraphicsScenePrivate::_q_emitUpdated()
     // the optimization that items send updates directly to the views, but it
     // needs to happen in order to keep compatibility with the behavior from
     // Qt 4.4 and backward.
-    if (connectedSignals[0] & changedSignalMask) {
+    if (isSignalConnected(changedSignalIndex)) {
         for (int i = 0; i < views.size(); ++i) {
             QGraphicsView *view = views.at(i);
             if (!view->d_func()->connectedToScene) {
@@ -2894,7 +2897,7 @@ void QGraphicsScene::update(const QRectF &rect)
 
     // Check if anyone's connected; if not, we can send updates directly to
     // the views. Otherwise or if there are no views, use old behavior.
-    bool directUpdates = !(d->connectedSignals[0] & d->changedSignalMask) && !d->views.isEmpty();
+    bool directUpdates = !(d->isSignalConnected(d->changedSignalIndex)) && !d->views.isEmpty();
     if (rect.isNull()) {
         d->updateAll = true;
         d->updatedRects.clear();
@@ -4473,7 +4476,7 @@ void QGraphicsScenePrivate::markDirty(QGraphicsItem *item, const QRectF &rect, b
     if (removingItemFromScene) {
         // Note that this function can be called from the item's destructor, so
         // do NOT call any virtual functions on it within this block.
-        if ((connectedSignals[0] & changedSignalMask) || views.isEmpty()) {
+        if (isSignalConnected(changedSignalIndex) || views.isEmpty()) {
             // This block of code is kept for compatibility. Since 4.5, by default
             // QGraphicsView does not connect the signal and we use the below
             // method of delivering updates.
@@ -4619,7 +4622,7 @@ void QGraphicsScenePrivate::processDirtyItemsRecursive(QGraphicsItem *item, bool
 
     // Process item.
     if (item->d_ptr->dirty || item->d_ptr->paintedViewBoundingRectsNeedRepaint) {
-        const bool useCompatUpdate = views.isEmpty() || (connectedSignals[0] & changedSignalMask);
+        const bool useCompatUpdate = views.isEmpty() || isSignalConnected(changedSignalIndex);
         const QRectF itemBoundingRect = adjustedItemBoundingRect(item);
 
         if (useCompatUpdate && !itemIsUntransformable && qFuzzyIsNull(item->boundingRegionGranularity())) {
diff --git a/src/gui/graphicsview/qgraphicsscene_p.h b/src/gui/graphicsview/qgraphicsscene_p.h
index 685f534..f1ddb5a 100644
--- a/src/gui/graphicsview/qgraphicsscene_p.h
+++ b/src/gui/graphicsview/qgraphicsscene_p.h
@@ -87,7 +87,7 @@ public:
 
     static QGraphicsScenePrivate *get(QGraphicsScene *q);
 
-    quint32 changedSignalMask;
+    static int changedSignalIndex;
 
     QGraphicsScene::ItemIndexMethod indexMethod;
     QGraphicsSceneIndex *index;
diff --git a/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp b/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp
index 433d0a8..7483bc1 100644
--- a/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp
+++ b/src/gui/graphicsview/qgraphicsscenebsptreeindex.cpp
@@ -419,8 +419,8 @@ bool QGraphicsSceneBspTreeIndexPrivate::closestItemFirst_withoutCache(const QGra
 
     // Find common ancestor, and each item's ancestor closest to the common
     // ancestor.
-    int item1Depth = d1->depth;
-    int item2Depth = d2->depth;
+    int item1Depth = d1->depth();
+    int item2Depth = d2->depth();
     const QGraphicsItem *p = item1;
     const QGraphicsItem *t1 = item1;
     while (item1Depth > item2Depth && (p = p->d_ptr->parent)) {