From d867c403dfbc284e2f564939622854900ab66919 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Samuel=20R=C3=B8dal?= <sroedal@trolltech.com>
Date: Thu, 14 Jan 2010 13:46:52 +0100
Subject: Fixed child items with graphics effects not inheriting opacity.
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We need to invalidate the graphics source pixmap cache for both child
items and parent items when changing the opacity of a graphics item.

Reviewed-by: Bjørn Erik Nilsen
---
 src/gui/graphicsview/qgraphicsitem.cpp             | 23 +++++++++++++--
 src/gui/graphicsview/qgraphicsitem_p.h             |  6 +++-
 tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp | 34 ++++++++++++++++++++--
 3 files changed, 57 insertions(+), 6 deletions(-)

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 1139be0..f4767b8 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -2567,7 +2567,9 @@ void QGraphicsItem::setOpacity(qreal opacity)
     // Update.
     if (d_ptr->scene) {
 #ifndef QT_NO_GRAPHICSEFFECT
-        d_ptr->invalidateGraphicsEffectsRecursively();
+        d_ptr->invalidateParentGraphicsEffectsRecursively();
+        if (!(d_ptr->flags & ItemDoesntPropagateOpacityToChildren))
+            d_ptr->invalidateChildGraphicsEffectsRecursively(QGraphicsItemPrivate::OpacityChanged);
 #endif //QT_NO_GRAPHICSEFFECT
         d_ptr->scene->d_func()->markDirty(this, QRectF(),
                                           /*invalidateChildren=*/true,
@@ -5077,7 +5079,7 @@ int QGraphicsItemPrivate::depth() const
     \internal
 */
 #ifndef QT_NO_GRAPHICSEFFECT
-void QGraphicsItemPrivate::invalidateGraphicsEffectsRecursively()
+void QGraphicsItemPrivate::invalidateParentGraphicsEffectsRecursively()
 {
     QGraphicsItemPrivate *itemPrivate = this;
     do {
@@ -5089,6 +5091,21 @@ void QGraphicsItemPrivate::invalidateGraphicsEffectsRecursively()
         }
     } while ((itemPrivate = itemPrivate->parent ? itemPrivate->parent->d_ptr.data() : 0));
 }
+
+void QGraphicsItemPrivate::invalidateChildGraphicsEffectsRecursively(QGraphicsItemPrivate::InvalidateReason reason)
+{
+    for (int i = 0; i < children.size(); ++i) {
+        QGraphicsItemPrivate *childPrivate = children.at(i)->d_ptr.data();
+        if (reason == OpacityChanged && (childPrivate->flags & QGraphicsItem::ItemIgnoresParentOpacity))
+            continue;
+        if (childPrivate->graphicsEffect) {
+            childPrivate->notifyInvalidated = 1;
+            static_cast<QGraphicsItemEffectSourcePrivate *>(childPrivate->graphicsEffect->d_func()->source->d_func())->invalidateCache();
+        }
+
+        childPrivate->invalidateChildGraphicsEffectsRecursively(reason);
+    }
+}
 #endif //QT_NO_GRAPHICSEFFECT
 
 /*!
@@ -5333,7 +5350,7 @@ void QGraphicsItem::update(const QRectF &rect)
 
     // Make sure we notify effects about invalidated source.
 #ifndef QT_NO_GRAPHICSEFFECT
-    d_ptr->invalidateGraphicsEffectsRecursively();
+    d_ptr->invalidateParentGraphicsEffectsRecursively();
 #endif //QT_NO_GRAPHICSEFFECT
 
     if (CacheMode(d_ptr->cacheMode) != NoCache) {
diff --git a/src/gui/graphicsview/qgraphicsitem_p.h b/src/gui/graphicsview/qgraphicsitem_p.h
index bdd8863..ff6e8bd 100644
--- a/src/gui/graphicsview/qgraphicsitem_p.h
+++ b/src/gui/graphicsview/qgraphicsitem_p.h
@@ -225,7 +225,11 @@ public:
                               bool ignoreDirtyBit = false, bool ignoreOpacity = false) const;
     int depth() const;
 #ifndef QT_NO_GRAPHICSEFFECT
-    void invalidateGraphicsEffectsRecursively();
+    enum InvalidateReason {
+        OpacityChanged
+    };
+    void invalidateParentGraphicsEffectsRecursively();
+    void invalidateChildGraphicsEffectsRecursively(InvalidateReason reason);
 #endif //QT_NO_GRAPHICSEFFECT
     void invalidateDepthRecursively();
     void resolveDepth();
diff --git a/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp b/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp
index 51e2a57..795431b 100644
--- a/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp
+++ b/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp
@@ -71,6 +71,7 @@ private slots:
     void colorize();
     void drawPixmapItem();
     void deviceCoordinateTranslateCaching();
+    void inheritOpacity();
 };
 
 void tst_QGraphicsEffect::initTestCase()
@@ -79,8 +80,8 @@ void tst_QGraphicsEffect::initTestCase()
 class CustomItem : public QGraphicsRectItem
 {
 public:
-    CustomItem(qreal x, qreal y, qreal width, qreal height)
-        : QGraphicsRectItem(x, y, width, height), numRepaints(0),
+    CustomItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = 0)
+        : QGraphicsRectItem(x, y, width, height, parent), numRepaints(0),
           m_painter(0), m_styleOption(0)
     {}
 
@@ -560,6 +561,35 @@ void tst_QGraphicsEffect::deviceCoordinateTranslateCaching()
     QVERIFY(item->numRepaints == numRepaints);
 }
 
+void tst_QGraphicsEffect::inheritOpacity()
+{
+    QGraphicsScene scene;
+    QGraphicsRectItem *rectItem = new QGraphicsRectItem(0, 0, 10, 10);
+    CustomItem *item = new CustomItem(0, 0, 10, 10, rectItem);
+
+    scene.addItem(rectItem);
+
+    item->setGraphicsEffect(new DeviceEffect);
+    item->setPen(Qt::NoPen);
+    item->setBrush(Qt::red);
+
+    rectItem->setOpacity(0.5);
+
+    QGraphicsView view(&scene);
+    view.show();
+    QTest::qWaitForWindowShown(&view);
+
+    QTRY_VERIFY(item->numRepaints >= 1);
+
+    int numRepaints = item->numRepaints;
+
+    rectItem->setOpacity(1);
+    QTest::qWait(50);
+
+    // item should have been rerendered due to opacity changing
+    QTRY_VERIFY(item->numRepaints > numRepaints);
+}
+
 QTEST_MAIN(tst_QGraphicsEffect)
 #include "tst_qgraphicseffect.moc"
 
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