--- a/src/gui/graphicsview/qgraphicsview.cpp	Tue Feb 02 00:43:10 2010 +0200
+++ b/src/gui/graphicsview/qgraphicsview.cpp	Wed Mar 31 11:06:36 2010 +0300
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
@@ -217,7 +217,9 @@
     common side effect is that items that do draw with antialiasing can leave
     painting traces behind on the scene as they are moved.
 
-    \omitvalue IndirectPainting
+    \value IndirectPainting Since Qt 4.6, restore the old painting algorithm
+    that calls QGraphicsView::drawItems() and QGraphicsScene::drawItems().
+    To be used only for compatibility with old code.
 */
 
 /*!
@@ -2746,7 +2748,6 @@
                     }
                 }
             }
-            d->scene->d_func()->updateAll = false;
         }
         break;
     case QEvent::TouchBegin:
@@ -3359,13 +3360,8 @@
             backgroundPainter.setClipRegion(d->backgroundPixmapExposed, Qt::ReplaceClip);
             if (viewTransformed)
                 backgroundPainter.setTransform(viewTransform);
-#ifdef Q_WS_X11
-#undef X11
-            if (backgroundPainter.paintEngine()->type() != QPaintEngine::X11)
-#define X11 qt_x11Data
-#endif
-                backgroundPainter.setCompositionMode(QPainter::CompositionMode_Source);
-            drawBackground(&backgroundPainter, exposedSceneRect);
+            QRectF backgroundExposedSceneRect = mapToScene(d->backgroundPixmapExposed.boundingRect()).boundingRect();
+            drawBackground(&backgroundPainter, backgroundExposedSceneRect);
             d->backgroundPixmapExposed = QRegion();
         }
 
@@ -3398,6 +3394,13 @@
         if (!d->scene->d_func()->painterStateProtection)
             painter.setWorldTransform(viewTransform);
     } else {
+        // Make sure we don't have unpolished items before we draw
+        if (!d->scene->d_func()->unpolishedItems.isEmpty())
+            d->scene->d_func()->_q_polishItems();
+        // We reset updateAll here (after we've issued polish events)
+        // so that we can discard update requests coming from polishEvent().
+        d->scene->d_func()->updateAll = false;
+
         // Find all exposed items
         bool allItems = false;
         QList<QGraphicsItem *> itemList = d->findItems(d->exposedRegion, &allItems, viewTransform);
@@ -3406,9 +3409,25 @@
             const int numItems = itemList.size();
             QGraphicsItem **itemArray = &itemList[0]; // Relies on QList internals, but is perfectly valid.
             QStyleOptionGraphicsItem *styleOptionArray = d->allocStyleOptionsArray(numItems);
+            QTransform transform(Qt::Uninitialized);
             for (int i = 0; i < numItems; ++i) {
-                itemArray[i]->d_ptr->initStyleOption(&styleOptionArray[i], viewTransform,
-                                                     d->exposedRegion, allItems);
+                QGraphicsItem *item = itemArray[i];
+                QGraphicsItemPrivate *itemd = item->d_ptr.data();
+                itemd->initStyleOption(&styleOptionArray[i], viewTransform, d->exposedRegion, allItems);
+                // Cache the item's area in view coordinates.
+                // Note that we have to do this here in case the base class implementation
+                // (QGraphicsScene::drawItems) is not called. If it is, we'll do this
+                // operation twice, but that's the price one has to pay for using indirect
+                // painting :-/.
+                const QRectF brect = adjustedItemEffectiveBoundingRect(item);
+                if (!itemd->itemIsUntransformable()) {
+                    transform = item->sceneTransform();
+                    if (viewTransformed)
+                        transform *= viewTransform;
+                } else {
+                    transform = item->deviceTransform(viewTransform);
+                }
+                itemd->paintedViewBoundingRects.insert(d->viewport, transform.mapRect(brect).toRect());
             }
             // Draw the items.
             drawItems(&painter, numItems, itemArray, styleOptionArray);
@@ -3607,6 +3626,8 @@
 }
 
 /*!
+    \obsolete 
+
     Draws the items \a items in the scene using \a painter, after the
     background and before the foreground are drawn. \a numItems is the number
     of items in \a items and options in \a options. \a options is a list of
@@ -3615,6 +3636,10 @@
 
     The default implementation calls the scene's drawItems() function.
 
+    Since Qt 4.6, this function is not called anymore unless
+    the QGraphicsView::IndirectPainting flag is given as an Optimization
+    flag.
+
     \sa drawForeground(), drawBackground(), QGraphicsScene::drawItems()
 */
 void QGraphicsView::drawItems(QPainter *painter, int numItems,