Optimize QGraphicsItemEffectSourcePrivate::pixmap() for QGraphicsPixmapItems.

Even for DeviceCoordinate mode we can return the raw pixmap if the
graphics item size is untransformed.

Reviewed-by: Bjørn Erik Nilsen

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp b/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp
index 259df4dac9..69fc11830e 100644
--- a/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp
+++ b/tests/auto/qgraphicseffect/tst_qgraphicseffect.cpp
@@ -69,6 +69,7 @@ private slots:
     void opacity();
     void grayscale();
     void colorize();
+    void drawPixmapItem();
 };
 
 void tst_QGraphicsEffect::initTestCase()
@@ -465,6 +466,54 @@ void tst_QGraphicsEffect::colorize()
     QCOMPARE(image.pixel(10, 10), qRgb(122, 193, 66));
 }
 
+class PixmapItemEffect : public QGraphicsEffect
+{
+public:
+    PixmapItemEffect(const QPixmap &source)
+        : QGraphicsEffect()
+        , pixmap(source)
+        , repaints(0)
+    {}
+
+    QRectF boundingRectFor(const QRectF &rect) const
+    { return rect; }
+
+    void draw(QPainter *painter)
+    {
+        QVERIFY(sourcePixmap(Qt::LogicalCoordinates).pixmapData() == pixmap.pixmapData());
+        QVERIFY((painter->worldTransform().type() <= QTransform::TxTranslate) == (sourcePixmap(Qt::DeviceCoordinates).pixmapData() == pixmap.pixmapData()));
+
+        ++repaints;
+    }
+    QPixmap pixmap;
+    int repaints;
+};
+
+void tst_QGraphicsEffect::drawPixmapItem()
+{
+    QImage image(32, 32, QImage::Format_RGB32);
+    QPainter p(&image);
+    p.fillRect(0, 0, 32, 16, Qt::blue);
+    p.fillRect(0, 16, 32, 16, Qt::red);
+    p.end();
+
+    QGraphicsScene scene;
+    QGraphicsPixmapItem *item = new QGraphicsPixmapItem(QPixmap::fromImage(image));
+    scene.addItem(item);
+
+    PixmapItemEffect *effect = new PixmapItemEffect(item->pixmap());
+    item->setGraphicsEffect(effect);
+
+    QGraphicsView view(&scene);
+    view.show();
+    QTest::qWaitForWindowShown(&view);
+
+    item->rotate(180);
+    QTest::qWait(50);
+
+    QTRY_VERIFY(effect->repaints >= 2);
+}
+
 QTEST_MAIN(tst_QGraphicsEffect)
 #include "tst_qgraphicseffect.moc"