1 files changed, 191 insertions, 12 deletions

diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index 4de08fd6f..bbda469a7 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -186,6 +186,7 @@ QWidgetPrivate::QWidgetPrivate(int version)
       , widgetItem(0)
       , extraPaintEngine(0)
       , polished(0)
+      , graphicsEffect(0)
       , inheritedFontResolveMask(0)
       , inheritedPaletteResolveMask(0)
       , leftmargin(0)
@@ -242,6 +243,8 @@ QWidgetPrivate::~QWidgetPrivate()
 
     if (extra)
         deleteExtra();
+
+    delete graphicsEffect;
 }
 
 QWindowSurface *QWidgetPrivate::createDefaultWindowSurface()
@@ -1628,9 +1631,9 @@ bool QWidgetPrivate::isOverlapped(const QRect &rect) const
                 continue;
             }
 
-            if (qRectIntersects(sibling->data->crect, r)) {
+            if (qRectIntersects(sibling->d_func()->effectiveRectFor(sibling->data->crect), r)) {
                 const QWExtra *siblingExtra = sibling->d_func()->extra;
-                if (siblingExtra && siblingExtra->hasMask
+                if (siblingExtra && siblingExtra->hasMask && !sibling->d_func()->graphicsEffect
                     && !siblingExtra->mask.translated(sibling->data->crect.topLeft()).intersects(r)) {
                     continue;
                 }
@@ -1729,7 +1732,7 @@ QRect QWidgetPrivate::clipRect() const
     const QWidget * w = q;
     if (!w->isVisible())
         return QRect();
-    QRect r = q->rect();
+    QRect r = effectiveRectFor(q->rect());
     int ox = 0;
     int oy = 0;
     while (w
@@ -1871,12 +1874,14 @@ void QWidgetPrivate::subtractOpaqueSiblings(QRegion &sourceRegion, bool *hasDirt
             break;
         QWidgetPrivate *pd = w->parentWidget()->d_func();
         const int myIndex = pd->children.indexOf(const_cast<QWidget *>(w));
+        const QRect widgetGeometry = w->d_func()->effectiveRectFor(w->data->crect);
         for (int i = myIndex + 1; i < pd->children.size(); ++i) {
             QWidget *sibling = qobject_cast<QWidget *>(pd->children.at(i));
             if (!sibling || !sibling->isVisible() || sibling->isWindow())
                 continue;
 
-            if (!qRectIntersects(sibling->data->crect, w->data->crect))
+            const QRect siblingGeometry = sibling->d_func()->effectiveRectFor(sibling->data->crect);
+            if (!qRectIntersects(siblingGeometry, widgetGeometry))
                 continue;
 
             if (dirtyClipBoundingRect) {
@@ -1884,7 +1889,7 @@ void QWidgetPrivate::subtractOpaqueSiblings(QRegion &sourceRegion, bool *hasDirt
                 dirtyClipBoundingRect = false;
             }
 
-            if (!qRectIntersects(sibling->data->crect, clipBoundingRect.translated(parentOffset)))
+            if (!qRectIntersects(siblingGeometry, clipBoundingRect.translated(parentOffset)))
                 continue;
 
             if (dirtyParentClip) {
@@ -1896,7 +1901,8 @@ void QWidgetPrivate::subtractOpaqueSiblings(QRegion &sourceRegion, bool *hasDirt
             const QRect siblingClipRect(sibling->d_func()->clipRect());
             QRegion siblingDirty(parentClip);
             siblingDirty &= (siblingClipRect.translated(siblingPos));
-            const bool hasMask = sibling->d_func()->extra && sibling->d_func()->extra->hasMask;
+            const bool hasMask = sibling->d_func()->extra && sibling->d_func()->extra->hasMask
+                                 && !sibling->d_func()->graphicsEffect;
             if (hasMask)
                 siblingDirty &= sibling->d_func()->extra->mask.translated(siblingPos);
             if (siblingDirty.isEmpty())
@@ -1907,7 +1913,7 @@ void QWidgetPrivate::subtractOpaqueSiblings(QRegion &sourceRegion, bool *hasDirt
                     siblingDirty.translate(-parentOffset);
                     sourceRegion -= siblingDirty;
                 } else {
-                    sourceRegion -= sibling->data->crect.translated(-parentOffset);
+                    sourceRegion -= siblingGeometry.translated(-parentOffset);
                 }
             } else {
                 if (hasDirtySiblingsAbove)
@@ -1938,6 +1944,11 @@ void QWidgetPrivate::clipToEffectiveMask(QRegion &region) const
     const QWidget *w = q;
     QPoint offset;
 
+    if (graphicsEffect) {
+        w = q->parentWidget();
+        offset -= data.crect.topLeft();
+    }
+
     while (w) {
         const QWidgetPrivate *wd = w->d_func();
         if (wd->extra && wd->extra->hasMask)
@@ -1971,6 +1982,12 @@ void QWidgetPrivate::updateIsOpaque()
     // hw: todo: only needed if opacity actually changed
     setDirtyOpaqueRegion();
 
+    if (graphicsEffect) {
+        // ### We should probably add QGraphicsEffect::isOpaque at some point.
+        setOpaque(false);
+        return;
+    }
+
     Q_Q(QWidget);
 #ifdef Q_WS_X11
     if (q->testAttribute(Qt::WA_X11OpenGLOverlay)) {
@@ -4948,6 +4965,54 @@ void QWidgetPrivate::setSoftKeys_sys(const QList<QAction*> &softkeys)
 }
 #endif // !defined(Q_OS_SYMBIAN)
 
+QGraphicsEffect *QWidget::graphicsEffect() const
+{
+    Q_D(const QWidget);
+    return d->graphicsEffect;
+}
+
+/*!
+    Sets \a effect as the widget's effect. If there already is an effect installed
+    on this widget, QWidget will delete the existing effect before installing
+    the new \a effect.
+
+    If \a effect is the installed on a different widget, setGraphicsEffect() will remove
+    the effect from the widget and install it on this widget.
+
+    \note This function will apply the effect on itself and all its children.
+
+    \since 4.6
+*/
+void QWidget::setGraphicsEffect(QGraphicsEffect *effect)
+{
+    Q_D(QWidget);
+    if (d->graphicsEffect == effect)
+        return;
+
+    if (d->graphicsEffect && effect) {
+        delete d->graphicsEffect;
+        d->graphicsEffect = 0;
+    }
+
+    if (!effect) {
+        // Unset current effect.
+        QGraphicsEffectPrivate *oldEffectPrivate = d->graphicsEffect->d_func();
+        d->graphicsEffect = 0;
+        if (oldEffectPrivate) {
+            oldEffectPrivate->setGraphicsEffectSource(0); // deletes the current source.
+        }
+    } else {
+        // Set new effect.
+        QGraphicsEffectSourcePrivate *sourced = new QWidgetEffectSourcePrivate(this);
+        QGraphicsEffectSource *source = new QGraphicsEffectSource(*sourced);
+        d->graphicsEffect = effect;
+        effect->d_func()->setGraphicsEffectSource(source);
+    }
+
+    d->updateIsOpaque();
+    update();
+}
+
 bool QWidgetPrivate::isAboutToShow() const
 {
     if (data.in_show)
@@ -5092,6 +5157,33 @@ void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QP
         return;
 
     Q_Q(QWidget);
+    if (graphicsEffect && graphicsEffect->isEnabled()) {
+        QGraphicsEffectSource *source = graphicsEffect->d_func()->source;
+        QWidgetEffectSourcePrivate *sourced = static_cast<QWidgetEffectSourcePrivate *>
+                                                         (source->d_func());
+        if (!sourced->context) {
+            QWidgetPaintContext context(pdev, rgn, offset, flags, sharedPainter, backingStore);
+            sourced->context = &context;
+            if (!sharedPainter) {
+                QPaintEngine *paintEngine = pdev->paintEngine();
+                paintEngine->d_func()->systemClip = rgn.translated(offset);
+                QPainter p(pdev);
+                p.translate(offset);
+                context.painter = &p;
+                graphicsEffect->draw(&p, source);
+                paintEngine->d_func()->systemClip = QRegion();
+            } else {
+                context.painter = sharedPainter;
+                sharedPainter->save();
+                sharedPainter->translate(offset);
+                graphicsEffect->draw(sharedPainter, source);
+                sharedPainter->restore();
+            }
+            sourced->context = 0;
+            return;
+        }
+    }
+
     const bool asRoot = flags & DrawAsRoot;
     const bool alsoOnScreen = flags & DrawPaintOnScreen;
     const bool recursive = flags & DrawRecursive;
@@ -5124,7 +5216,7 @@ void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QP
                 if (sharedPainter)
                     paintEngine->d_func()->systemClip = toBePainted;
                 else
-                    paintEngine->setSystemRect(q->data->crect);
+                    paintEngine->d_func()->systemRect = q->data->crect;
 
                 //paint the background
                 if ((asRoot || q->autoFillBackground() || onScreen || q->testAttribute(Qt::WA_StyledBackground))
@@ -5163,7 +5255,7 @@ void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QP
             if (paintEngine) {
                 restoreRedirected();
                 if (!sharedPainter)
-                    paintEngine->setSystemRect(QRect());
+                    paintEngine->d_func()->systemRect = QRect();
                 else
                     paintEngine->d_func()->currentClipWidget = 0;
                 paintEngine->d_func()->systemClip = QRegion();
@@ -5226,7 +5318,7 @@ void QWidgetPrivate::paintSiblingsRecursive(QPaintDevice *pdev, const QObjectLis
                 dirtyBoundingRect = false;
             }
 
-            if (qRectIntersects(boundingRect, x->data->crect)) {
+            if (qRectIntersects(boundingRect, x->d_func()->effectiveRectFor(x->data->crect))) {
 #ifdef Q_BACKINGSTORE_SUBSURFACES
                 if (x->windowSurface() == currentSurface)
 #endif
@@ -5244,7 +5336,7 @@ void QWidgetPrivate::paintSiblingsRecursive(QPaintDevice *pdev, const QObjectLis
 
     QWidgetPrivate *wd = w->d_func();
     const QPoint widgetPos(w->data->crect.topLeft());
-    const bool hasMask = wd->extra && wd->extra->hasMask;
+    const bool hasMask = wd->extra && wd->extra->hasMask && !wd->graphicsEffect;
 
     if (index > 0) {
         QRegion wr(rgn);
@@ -5259,7 +5351,7 @@ void QWidgetPrivate::paintSiblingsRecursive(QPaintDevice *pdev, const QObjectLis
 
     if (w->updatesEnabled() && (!w->d_func()->extra || !w->d_func()->extra->proxyWidget)) {
         QRegion wRegion(rgn);
-        wRegion &= w->data->crect;
+        wRegion &= wd->effectiveRectFor(w->data->crect);
         wRegion.translate(-widgetPos);
         if (hasMask)
             wRegion &= wd->extra->mask;
@@ -5267,6 +5359,93 @@ void QWidgetPrivate::paintSiblingsRecursive(QPaintDevice *pdev, const QObjectLis
     }
 }
 
+QRectF QWidgetEffectSourcePrivate::boundingRect(Qt::CoordinateSystem system) const
+{
+    if (system != Qt::DeviceCoordinates)
+        return m_widget->rect();
+
+    if (!context) {
+        // Device coordinates without context not yet supported.
+        qWarning("QGraphicsEffectSource::boundingRect: Not yet implemented, lacking device context");
+        return QRectF();
+    }
+
+    return context->painter->worldTransform().mapRect(m_widget->rect());
+}
+
+void QWidgetEffectSourcePrivate::draw(QPainter *painter)
+{
+    if (!context || context->painter != painter) {
+        m_widget->render(painter);
+        return;
+    }
+
+    // The region saved in the context is neither clipped to the rect
+    // nor the mask, so we have to clip it here before calling drawWidget.
+    QRegion toBePainted = context->rgn;
+    toBePainted &= m_widget->rect();
+    QWidgetPrivate *wd = qt_widget_private(m_widget);
+    if (wd->extra && wd->extra->hasMask)
+        toBePainted &= wd->extra->mask;
+
+    wd->drawWidget(context->pdev, toBePainted, context->offset, context->flags,
+                   context->sharedPainter, context->backingStore);
+}
+
+QPixmap QWidgetEffectSourcePrivate::pixmap(Qt::CoordinateSystem system, QPoint *offset) const
+{
+    const bool deviceCoordinates = (system == Qt::DeviceCoordinates);
+    if (!context && deviceCoordinates) {
+        // Device coordinates without context not yet supported.
+        qWarning("QGraphicsEffectSource::pixmap: Not yet implemented, lacking device context");
+        return QPixmap();
+    }
+
+    QPoint pixmapOffset;
+    QRectF sourceRect = m_widget->rect();
+
+    if (deviceCoordinates) {
+        const QTransform &painterTransform = context->painter->worldTransform();
+        sourceRect = painterTransform.mapRect(sourceRect);
+        pixmapOffset = painterTransform.map(pixmapOffset);
+    }
+
+    QRect effectRect = m_widget->graphicsEffect()->boundingRectFor(sourceRect).toAlignedRect();
+    if (offset)
+        *offset = effectRect.topLeft();
+
+    if (deviceCoordinates) {
+        // Clip to device rect.
+        int left, top, right, bottom;
+        effectRect.getCoords(&left, &top, &right, &bottom);
+        if (left < 0) {
+            if (offset)
+                offset->rx() += -left;
+            effectRect.setX(0);
+        }
+        if (top < 0) {
+            if (offset)
+                offset->ry() += -top;
+            effectRect.setY(0);
+        }
+        // NB! We use +-1 for historical reasons (see QRect documentation).
+        QPaintDevice *device = context->painter->device();
+        const int deviceWidth = device->width();
+        const int deviceHeight = device->height();
+        if (right + 1 > deviceWidth)
+            effectRect.setRight(deviceWidth - 1);
+        if (bottom + 1 > deviceHeight)
+            effectRect.setBottom(deviceHeight -1);
+    }
+
+    pixmapOffset -= effectRect.topLeft();
+
+    QPixmap pixmap(effectRect.size());
+    pixmap.fill(Qt::transparent);
+    m_widget->render(&pixmap, pixmapOffset);
+    return pixmap;
+}
+
 /*!
     \internal