Add functional Graphics View benchmarks.

Widgets and use cases are externally developed and imported from:
git://gitorious.org/+qt-performance-test-developers/qt/qt-performance-test-developers-clone.git
(master branch, tests/benchmarks/uimodels/GraphicsViewBenchmark)

I couldn't simply import everything because the benchmarks were heavily
dependent on an internal measuring tool involving QtScripts and whatnot,
not suitable for inclusion in the Qt repository. Everything is now converted
into proper QTestLib compatible benchmark functions.

1 files changed, 686 insertions, 0 deletions

diff --git a/tests/benchmarks/gui/graphicsview/functional/GraphicsViewBenchmark/main.cpp b/tests/benchmarks/gui/graphicsview/functional/GraphicsViewBenchmark/main.cpp
new file mode 100644
index 0000000..f294717
--- /dev/null
+++ b/tests/benchmarks/gui/graphicsview/functional/GraphicsViewBenchmark/main.cpp
@@ -0,0 +1,686 @@
+#include <QtTest/QtTest>
+#include <QtGui/qgraphicsview.h>
+#include <QtGui/qpixmapcache.h>
+
+#include "mainview.h"
+#include "dummydatagen.h"
+#include "simplelist.h"
+#include "itemrecyclinglist.h"
+#include "simplelist.h"
+#include "theme.h"
+
+class tst_GraphicsViewBenchmark : public QObject
+{
+    Q_OBJECT
+public:
+    enum ListType {
+        Simple,
+        Recycling,
+        None
+    };
+
+    enum ScrollStep {
+        Slow = 2,
+        Normal = 8,
+        Fast = 64
+    };
+
+    tst_GraphicsViewBenchmark()
+        : mMainView(0), currentListSize(-1), currentListType(None) {}
+    ~tst_GraphicsViewBenchmark() {}
+
+public slots:
+    void initTestCase();
+    void cleanupTestCase();
+    void init();
+
+private slots:
+    // Benchmarks:
+    void createAndFillList_data();
+    void createAndFillList();
+    void add100ItemsToBeginningOfList_data();
+    void add100ItemsToBeginningOfList();
+    void remove100ItemsFromBeginningOfList_data();
+    void remove100ItemsFromBeginningOfList();
+    void deleteList_data();
+    void deleteList();
+    void themeChange_data();
+    void themeChange();
+    void update_data();
+    void update();
+    void scroll_data();
+    void scroll();
+
+private:
+    MainView *mMainView;
+    DummyDataGenerator mDataGenerator;
+    int currentListSize;
+    ListType currentListType;
+
+    void resetView();
+    void ensureListSizeAndType(int listSize, ListType listType);
+    void ensureTheme(Theme::Themes theme);
+    void ensureRotationAngle(int rotation);
+    void ensureSubtreeCache(bool enable);
+    void ensureImageBasedRendering(bool enable);
+    void insertListData();
+    inline void setTestWidget(QGraphicsWidget *widget, int listSize, ListType listType)
+    {
+        currentListSize = listSize;
+        currentListType = listType;
+        mMainView->setTestWidget(widget);
+    }
+};
+
+Q_DECLARE_METATYPE(tst_GraphicsViewBenchmark::ListType)
+Q_DECLARE_METATYPE(Theme::Themes)
+Q_DECLARE_METATYPE(tst_GraphicsViewBenchmark::ScrollStep)
+
+const int AddRemoveCount = 100;
+
+static ListItem *newSimpleListItem(DummyDataGenerator &dataGenerator, const int id)
+{
+    ListItem *item = new ListItem();
+    item->setText(dataGenerator.randomName(), ListItem::FirstPos );
+    item->setText(dataGenerator.randomPhoneNumber(QString("%1").arg(id)), ListItem::SecondPos );
+    item->setIcon(new IconItem(dataGenerator.randomIconItem(), item), ListItem::LeftIcon );
+    item->setIcon(new IconItem(dataGenerator.randomStatusItem(), item), ListItem::RightIcon);
+    item->setFont(Theme::p()->font(Theme::ContactName), ListItem::FirstPos);
+    item->setFont(Theme::p()->font(Theme::ContactNumber), ListItem::SecondPos);
+    item->setBorderPen(Theme::p()->listItemBorderPen());
+    item->setRounding(Theme::p()->listItemRounding());
+    item->icon(ListItem::LeftIcon)->setRotation(Theme::p()->iconRotation(ListItem::LeftIcon));
+    item->icon(ListItem::RightIcon)->setRotation(Theme::p()->iconRotation(ListItem::RightIcon));
+    item->icon(ListItem::LeftIcon)->setSmoothTransformationEnabled(Theme::p()->isIconSmoothTransformationEnabled(ListItem::LeftIcon));
+    item->icon(ListItem::RightIcon)->setSmoothTransformationEnabled(Theme::p()->isIconSmoothTransformationEnabled(ListItem::RightIcon));
+    item->icon(ListItem::LeftIcon)->setOpacityEffectEnabled(Theme::p()->isIconOpacityEffectEnabled(ListItem::LeftIcon));
+    item->icon(ListItem::RightIcon)->setOpacityEffectEnabled(Theme::p()->isIconOpacityEffectEnabled(ListItem::RightIcon));
+    return item;
+}
+
+static RecycledListItem *newRecyclingListItem(DummyDataGenerator &dataGenerator, const int id)
+{
+    RecycledListItem *item = new RecycledListItem();
+    item->item()->setText(dataGenerator.randomName(), ListItem::FirstPos );
+    item->item()->setText(dataGenerator.randomPhoneNumber(QString("%1").arg(id)), ListItem::SecondPos );
+    item->item()->setIcon(new IconItem(dataGenerator.randomIconItem()), ListItem::LeftIcon );
+    item->item()->setIcon(new IconItem(dataGenerator.randomStatusItem()), ListItem::RightIcon);
+    item->item()->setFont(Theme::p()->font(Theme::ContactName), ListItem::FirstPos);
+    item->item()->setFont(Theme::p()->font(Theme::ContactNumber), ListItem::SecondPos);
+    item->item()->setBorderPen(Theme::p()->listItemBorderPen());
+    item->item()->setRounding(Theme::p()->listItemRounding());
+    item->item()->icon(ListItem::LeftIcon)->setRotation(Theme::p()->iconRotation(ListItem::LeftIcon));
+    item->item()->icon(ListItem::RightIcon)->setRotation(Theme::p()->iconRotation(ListItem::RightIcon));
+    item->item()->icon(ListItem::LeftIcon)->setSmoothTransformationEnabled(Theme::p()->isIconSmoothTransformationEnabled(ListItem::LeftIcon));
+    item->item()->icon(ListItem::RightIcon)->setSmoothTransformationEnabled(Theme::p()->isIconSmoothTransformationEnabled(ListItem::RightIcon));
+    item->item()->icon(ListItem::LeftIcon)->setOpacityEffectEnabled(Theme::p()->isIconOpacityEffectEnabled(ListItem::LeftIcon));
+    item->item()->icon(ListItem::RightIcon)->setOpacityEffectEnabled(Theme::p()->isIconOpacityEffectEnabled(ListItem::RightIcon));
+    return item;
+}
+
+static void fillList(DummyDataGenerator &dataGenerator, int itemCount, QGraphicsWidget *list)
+{
+    if (SimpleList *simpleList = qobject_cast<SimpleList *>(list)) {
+        for (int i = 0; i < itemCount; ++i)
+            simpleList->addItem(newSimpleListItem(dataGenerator, i));
+    } else if (ItemRecyclingList *recyclingList = qobject_cast<ItemRecyclingList *>(list)) {
+        for (int i = 0; i < itemCount; ++i)
+            recyclingList->addItem(newRecyclingListItem(dataGenerator, i));
+    } else {
+        qFatal("fillList: internal error");
+    }
+}
+
+void tst_GraphicsViewBenchmark::resetView()
+{
+    if (QGraphicsWidget *widget = mMainView->takeTestWidget()) {
+        delete widget;
+        currentListSize = -1;
+        currentListType = None;
+        QTest::qWait(50);
+    } else {
+        if (currentListSize != -1)
+            qFatal("tst_GraphicsViewBenchmark::resetView: internal error: wrong list size");
+        if (currentListType != None)
+            qFatal("tst_GraphicsViewBenchmark::resetView: internal error: wrong list type");
+    }
+    ensureTheme(Theme::Blue);
+    ensureRotationAngle(0);
+    ensureSubtreeCache(false);
+    ensureImageBasedRendering(false);
+}
+
+void tst_GraphicsViewBenchmark::ensureListSizeAndType(int listSize, ListType listType)
+{
+    if (currentListSize != listSize || currentListType != listType) {
+        resetView();
+        if (listType == Simple) {
+            SimpleList *list = new SimpleList;
+            fillList(mDataGenerator, listSize, list);
+            setTestWidget(list, listSize, listType);
+        } else if (listType == Recycling) {
+            ItemRecyclingList *list = new ItemRecyclingList;
+            fillList(mDataGenerator, listSize, list);
+            setTestWidget(list, listSize, listType);
+        }
+        QTest::qWait(50);
+        return;
+    }
+
+    // Okay, we're supposed to have the right list type and size. Make sure we actually have it.
+    QGraphicsWidget *widget = mMainView->testWidget();
+    if (!widget) {
+        if (currentListType != None || currentListSize != -1)
+            qFatal("tst_GraphicsViewBenchmark::ensureListSizeAndType: internal error: no test widget");
+        return;
+    }
+
+    if (listType == Simple) {
+        SimpleList *list = qobject_cast<SimpleList *>(widget);
+        if (!list)
+            qFatal("tst_GraphicsViewBenchmark::ensureListSizeAndType: internal error: wrong list type");
+        if (list->itemCount() != listSize)
+            qFatal("tst_GraphicsViewBenchmark::ensureListSizeAndType: internal error: wrong list size");
+    } else if (listType == Recycling){
+        ItemRecyclingList *list = qobject_cast<ItemRecyclingList *>(widget);
+        if (!list)
+            qFatal("tst_GraphicsViewBenchmark::ensureListSizeAndType: internal error: wrong list type");
+        if (list->rows() != listSize)
+            qFatal("tst_GraphicsViewBenchmark::ensureListSizeAndType: internal error: wrong list size");
+    }
+}
+
+void tst_GraphicsViewBenchmark::ensureTheme(Theme::Themes theme)
+{
+    if (Theme::p()->theme() != theme) {
+        Theme::p()->setTheme(theme);
+        // The theme change itself can take a lot of time, so make
+        // sure we give it a little bit time to stabilize *after*
+        // the changes, hence sendPostedEvents(); qWait();
+        QApplication::sendPostedEvents();
+        QTest::qWait(50);
+    }
+}
+
+void tst_GraphicsViewBenchmark::ensureRotationAngle(int angle)
+{
+    const bool useTwoColumns = angle != 0;
+    bool wait = false;
+    if (mMainView->rotationAngle() != angle) {
+        mMainView->rotateContent(-mMainView->rotationAngle() + angle);
+        wait = true;
+    }
+    if (QGraphicsWidget *widget = mMainView->testWidget()) {
+        if (SimpleList *list = qobject_cast<SimpleList *>(widget)) {
+            if (list->twoColumns() != useTwoColumns) {
+                list->setTwoColumns(useTwoColumns);
+                wait = true;
+            }
+        } else if (ItemRecyclingList *list = qobject_cast<ItemRecyclingList *>(widget)) {
+            if (list->twoColumns() != useTwoColumns) {
+                list->setTwoColumns(useTwoColumns);
+                wait = true;
+            }
+        }
+    }
+    if (wait)
+        QTest::qWait(50);
+}
+
+void tst_GraphicsViewBenchmark::ensureSubtreeCache(bool enable)
+{
+    QGraphicsWidget *widget = mMainView->testWidget();
+    if (!widget)
+        return;
+
+    if (SimpleList *list = qobject_cast<SimpleList *>(widget)) {
+        if (list->listItemCaching() != enable) {
+            list->setListItemCaching(enable);
+            QTest::qWait(50);
+        }
+    } else if (ItemRecyclingList *list = qobject_cast<ItemRecyclingList *>(widget)) {
+        if (list->listItemCaching() != enable) {
+            list->setListItemCaching(enable);
+            QTest::qWait(50);
+        }
+    }
+    QPixmapCache::clear();
+}
+
+void tst_GraphicsViewBenchmark::ensureImageBasedRendering(bool enable)
+{
+    if (mMainView->imageBasedRendering() != enable) {
+        mMainView->setImageBasedRendering(enable);
+        QTest::qWait(50);
+    }
+}
+
+void tst_GraphicsViewBenchmark::insertListData()
+{
+    QTest::addColumn<int>("listSize");
+    QTest::addColumn<ListType>("listType");
+
+    QTest::newRow("Simple list containing 10 items") << 10 << Simple;
+    QTest::newRow("Recycling list containing 10 items") << 10 << Recycling;
+    QTest::newRow("Simple list containing 50 items") << 50 << Simple;
+    QTest::newRow("Recycling list containing 50 items") << 50 << Recycling;
+    QTest::newRow("Simple list containing 500 items") << 500 << Simple;
+    QTest::newRow("Recycling list containing 500 items") << 500 << Recycling;
+}
+
+void tst_GraphicsViewBenchmark::initTestCase()
+{
+    // ### Add support for:
+    // 1) OpenGL
+    // 2) FPS
+    // 3) Running the test manually
+    // Everything we need is already in widgets/[settings.cpp, commandline.cpp]
+    mMainView = new MainView(/*enableOpenGL=*/false, /*outputFPS=*/false);
+
+#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5)
+    mMainView->showFullScreen();
+#else
+    mMainView->resize(360, 640);
+    mMainView->show();
+#endif
+
+    mDataGenerator.Reset();
+    SimpleList *list = new SimpleList;
+    list->setListItemCaching(false);
+    mMainView->setTestWidget(list);
+    fillList(mDataGenerator, 5, list);
+    mMainView->takeTestWidget();
+    delete list;
+
+    currentListSize = -1;
+    currentListType = None;
+
+    QTest::qWaitForWindowShown(mMainView);
+}
+
+void tst_GraphicsViewBenchmark::cleanupTestCase()
+{
+    delete mMainView;
+    mMainView = 0;
+}
+
+void tst_GraphicsViewBenchmark::init()
+{
+    // Make sure we don't have pending events in the queue.
+    // Yes, each test run takes a little bit longer, but the results are more stable.
+    QTest::qWait(150);
+}
+
+void tst_GraphicsViewBenchmark::createAndFillList_data()
+{
+    insertListData();
+}
+
+void tst_GraphicsViewBenchmark::createAndFillList()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+
+    resetView();
+
+    if (listType == Simple) {
+        QBENCHMARK {
+            SimpleList *list = new SimpleList;
+            setTestWidget(list, listSize, listType);
+            fillList(mDataGenerator, listSize, list);
+        }
+    } else {
+        QBENCHMARK {
+            ItemRecyclingList *list = new ItemRecyclingList;
+            setTestWidget(list, listSize, listType);
+            fillList(mDataGenerator, listSize, list);
+        }
+    }
+
+    resetView();
+}
+
+void tst_GraphicsViewBenchmark::add100ItemsToBeginningOfList_data()
+{
+    insertListData();
+}
+
+void tst_GraphicsViewBenchmark::add100ItemsToBeginningOfList()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+
+    resetView();
+
+    if (listType == Simple) {
+        SimpleList *list = new SimpleList;
+        fillList(mDataGenerator, listSize, list);
+        setTestWidget(list, listSize, listType);
+        QTest::qWait(50);
+        QBENCHMARK {
+            for (int i = 0; i < AddRemoveCount; ++i)
+                list->insertItem(0, newSimpleListItem(mDataGenerator, i));
+        }
+    } else {
+        ItemRecyclingList *list = new ItemRecyclingList;
+        fillList(mDataGenerator, listSize, list);
+        setTestWidget(list, listSize, listType);
+        QTest::qWait(50);
+        QBENCHMARK {
+            for (int i = 0; i < AddRemoveCount; ++i)
+                list->insertItem(0, newRecyclingListItem(mDataGenerator, i));
+        }
+    }
+
+    resetView();
+}
+
+void tst_GraphicsViewBenchmark::remove100ItemsFromBeginningOfList_data()
+{
+    insertListData();
+}
+
+void tst_GraphicsViewBenchmark::remove100ItemsFromBeginningOfList()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+
+    resetView();
+
+    if (listType == Simple) {
+        SimpleList *list = new SimpleList;
+        fillList(mDataGenerator, listSize, list);
+        setTestWidget(list, listSize, listType);
+        QTest::qWait(50);
+        QBENCHMARK {
+            for (int i = 0; i < AddRemoveCount; ++i)
+                delete list->takeItem(0);
+        }
+    } else {
+        ItemRecyclingList *list = new ItemRecyclingList;
+        fillList(mDataGenerator, listSize, list);
+        setTestWidget(list, listSize, listType);
+        QTest::qWait(50);
+        QBENCHMARK {
+            for (int i = 0; i < AddRemoveCount; ++i)
+                delete list->takeItem(0);
+        }
+    }
+
+    resetView();
+}
+
+void tst_GraphicsViewBenchmark::deleteList_data()
+{
+    insertListData();
+    QTest::newRow("Simple list containing 1000 items") << 1000 << Simple;
+    QTest::newRow("Recycling list containing 1000 items") << 1000 << Recycling;
+}
+
+void tst_GraphicsViewBenchmark::deleteList()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+
+    if (listSize < 500)
+        return; // Too small to measure.
+
+    QGraphicsWidget *list = 0;
+    if (listType == Simple)
+        list = new SimpleList;
+    else
+        list = new ItemRecyclingList;
+    fillList(mDataGenerator, listSize, list);
+    QTest::qWait(20);
+
+    QBENCHMARK_ONCE {
+        delete list;
+    }
+}
+
+void tst_GraphicsViewBenchmark::themeChange_data()
+{
+    QTest::addColumn<int>("listSize");
+    QTest::addColumn<ListType>("listType");
+    QTest::addColumn<Theme::Themes>("fromTheme");
+    QTest::addColumn<Theme::Themes>("toTheme");
+
+    QTest::newRow("From Blue to Lime, simple list containing 10 items") << 10 << Simple << Theme::Blue << Theme::Lime;
+    QTest::newRow("From Lime to Blue, simple list containing 10 items") << 10 << Simple << Theme::Lime << Theme::Blue;
+
+    QTest::newRow("From Blue to Lime, recycling list containing 10 items") << 10 << Recycling << Theme::Blue << Theme::Lime;
+    QTest::newRow("From Lime to Blue, recycling list containing 10 items") << 10 << Recycling << Theme::Lime << Theme::Blue;
+
+    QTest::newRow("From Blue to Lime, simple list containing 50 items") << 50 << Simple << Theme::Blue << Theme::Lime;
+    QTest::newRow("From Lime to Blue, simple list containing 50 items") << 50 << Simple << Theme::Lime << Theme::Blue;
+
+    QTest::newRow("From Blue to Lime, recycling list containing 50 items") << 50 << Recycling << Theme::Blue << Theme::Lime;
+    QTest::newRow("From Lime to Blue, recycling list containing 50 items") << 50 << Recycling << Theme::Lime << Theme::Blue;
+
+    QTest::newRow("From Blue to Lime, simple list containing 500 items") << 500 << Simple << Theme::Blue << Theme::Lime;
+    QTest::newRow("From Lime to Blue, simple list containing 500 items") << 500 << Simple << Theme::Lime << Theme::Blue;
+
+    QTest::newRow("From Blue to Lime, recycling list containing 500 items") << 500 << Recycling << Theme::Blue << Theme::Lime;
+    QTest::newRow("From Lime to Blue, recycling list containing 500 items") << 500 << Recycling << Theme::Lime << Theme::Blue;
+}
+
+void tst_GraphicsViewBenchmark::themeChange()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+    QFETCH(Theme::Themes, fromTheme);
+    QFETCH(Theme::Themes, toTheme);
+
+    if (fromTheme == toTheme)
+        qFatal("tst_GraphicsViewBenchmark::themeChange: to and from theme is the same");
+
+    ensureListSizeAndType(listSize, listType);
+    ensureTheme(fromTheme);
+
+    QBENCHMARK {
+        Theme::p()->setTheme(toTheme);
+    }
+}
+
+static inline QLatin1String stringForTheme(Theme::Themes theme)
+{
+    if (theme == Theme::Blue)
+        return QLatin1String("Blue");
+    return QLatin1String("Lime");
+}
+
+static inline QLatin1String stringForListType(tst_GraphicsViewBenchmark::ListType type)
+{
+    if (type == tst_GraphicsViewBenchmark::Simple)
+        return QLatin1String("Simple");
+    if (type == tst_GraphicsViewBenchmark::Recycling)
+        return QLatin1String("Recycling");
+    return QLatin1String("None");
+}
+
+static inline QLatin1String stringForScrollStep(tst_GraphicsViewBenchmark::ScrollStep step)
+{
+    if (step == tst_GraphicsViewBenchmark::Slow)
+        return QLatin1String("Slow");
+    if (step == tst_GraphicsViewBenchmark::Normal)
+        return QLatin1String("Normal");
+    return QLatin1String("Fast");
+}
+
+static inline QString rowString(int listSize, tst_GraphicsViewBenchmark::ListType listType,
+                                Theme::Themes theme, int toImage, int cache, int angle)
+{
+    return QString("Items=%1, List=%2, Theme=%3, RenderToImage=%4, Cache=%5, RotAngle=%6")
+           .arg(QString::number(listSize)).arg(stringForListType(listType))
+           .arg(stringForTheme(theme)).arg(QString::number(toImage))
+           .arg(QString::number(cache)).arg(QString::number(angle));
+}
+
+static inline QString rowString(int listSize, tst_GraphicsViewBenchmark::ListType listType,
+                                Theme::Themes theme, int cache, int angle,
+                                tst_GraphicsViewBenchmark::ScrollStep step)
+{
+    return QString("Items=%1, List=%2, Theme=%3, Cache=%4, RotAngle=%5, Speed=%6")
+           .arg(QString::number(listSize)).arg(stringForListType(listType))
+           .arg(stringForTheme(theme)).arg(QString::number(cache))
+           .arg(QString::number(angle)).arg(stringForScrollStep(step));
+}
+
+void tst_GraphicsViewBenchmark::update_data()
+{
+    QTest::addColumn<int>("listSize");
+    QTest::addColumn<ListType>("listType");
+    QTest::addColumn<Theme::Themes>("theme");
+    QTest::addColumn<bool>("renderToImage");
+    QTest::addColumn<bool>("subtreeCache");
+    QTest::addColumn<int>("rotationAngle");
+
+    QList<ListType> listTypes;
+    listTypes << Simple << Recycling;
+
+    QList<int> listSizes;
+    listSizes << 10 << 50 << 500;
+
+    QList<Theme::Themes> themes;
+    themes << Theme::Blue << Theme::Lime;
+
+    QList<int> rotationAngles;
+    rotationAngles << 0 << 90;
+
+    // Generate rows:
+    foreach (ListType listType, listTypes) {
+        foreach (int listSize, listSizes) {
+            foreach (int angle, rotationAngles) {
+                foreach (Theme::Themes theme, themes) {
+                    for (int toImage = 0; toImage < 2; ++toImage) {
+                        for (int cache = 0; cache < 2; ++cache) {
+                            QString string = rowString(listSize, listType, theme, toImage, cache, angle);
+                            QTest::newRow(string.toLatin1()) << listSize << listType << theme << bool(toImage)
+                                                             << bool(cache) << angle;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+void tst_GraphicsViewBenchmark::update()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+    QFETCH(Theme::Themes, theme);
+    QFETCH(bool, renderToImage);
+    QFETCH(bool, subtreeCache);
+    QFETCH(int, rotationAngle);
+
+    mMainView->viewport()->setUpdatesEnabled(false);
+
+    ensureListSizeAndType(listSize, listType);
+    ensureTheme(theme);
+    ensureRotationAngle(rotationAngle);
+    ensureSubtreeCache(subtreeCache);
+    ensureImageBasedRendering(renderToImage);
+
+    QEventLoop loop;
+    QObject::connect(mMainView, SIGNAL(repainted()), &loop, SLOT(quit()));
+    QTimer::singleShot(4000, &loop, SLOT(quit()));
+    // Dry run (especially important when cache is enabled).
+    // NB! setUpdatesEnabled triggers an update().
+    mMainView->viewport()->setUpdatesEnabled(true);
+    loop.exec(QEventLoop::AllEvents | QEventLoop::ExcludeUserInputEvents| QEventLoop::ExcludeSocketNotifiers);
+    QTest::qWait(50);
+
+    QTimer::singleShot(4000, &loop, SLOT(quit()));
+    QBENCHMARK {
+        mMainView->viewport()->update();
+        loop.exec(QEventLoop::AllEvents | QEventLoop::ExcludeUserInputEvents| QEventLoop::ExcludeSocketNotifiers);
+    }
+}
+
+void tst_GraphicsViewBenchmark::scroll_data()
+{
+    QTest::addColumn<int>("listSize");
+    QTest::addColumn<ListType>("listType");
+    QTest::addColumn<Theme::Themes>("theme");
+    QTest::addColumn<bool>("subtreeCache");
+    QTest::addColumn<int>("rotationAngle");
+    QTest::addColumn<ScrollStep>("scrollStep");
+
+    QList<ListType> listTypes;
+    listTypes << Simple << Recycling;
+
+    QList<int> listSizes;
+    listSizes << 10 << 50 << 500;
+
+    QList<Theme::Themes> themes;
+    themes << Theme::Blue << Theme::Lime;
+
+    QList<int> rotationAngles;
+    rotationAngles << 0 << 90;
+
+    QList<ScrollStep> scrollSteps;
+    scrollSteps << Slow << Normal << Fast;
+
+    // Generate rows:
+    foreach (ListType listType, listTypes) {
+        foreach (int listSize, listSizes) {
+            foreach (int angle, rotationAngles) {
+                foreach (ScrollStep step, scrollSteps) {
+                    foreach (Theme::Themes theme, themes) {
+                        for (int cache = 0; cache < 2; ++cache) {
+                            QString string = rowString(listSize, listType, theme, cache, angle, step);
+                            QTest::newRow(string.toLatin1()) << listSize << listType << theme
+                                                             << bool(cache) << angle << step;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+void tst_GraphicsViewBenchmark::scroll()
+{
+    QFETCH(int, listSize);
+    QFETCH(ListType, listType);
+    QFETCH(Theme::Themes, theme);
+    QFETCH(bool, subtreeCache);
+    QFETCH(int, rotationAngle);
+    QFETCH(ScrollStep, scrollStep);
+
+    mMainView->viewport()->setUpdatesEnabled(false);
+
+    ensureListSizeAndType(listSize, listType);
+    ensureTheme(theme);
+    ensureRotationAngle(rotationAngle);
+    ensureSubtreeCache(subtreeCache);
+    ensureImageBasedRendering(false);
+
+    ScrollBar *sb = 0;
+    if (listType == Simple)
+        sb = static_cast<SimpleList *>(mMainView->testWidget())->verticalScrollBar();
+    else
+        sb = static_cast<ItemRecyclingList *>(mMainView->testWidget())->verticalScrollBar();
+    const qreal sliderStart = sb->sliderSize() / qreal(2.0);
+    const qreal sliderTarget = sliderStart + qreal(scrollStep);
+    sb->setSliderPosition(sliderStart);
+
+    QEventLoop loop;
+    QObject::connect(mMainView, SIGNAL(repainted()), &loop, SLOT(quit()));
+    QTimer::singleShot(4000, &loop, SLOT(quit()));
+    // Dry run (especially important when cache is enabled).
+    // NB! setUpdatesEnabled triggers an update().
+    mMainView->viewport()->setUpdatesEnabled(true);
+    loop.exec(QEventLoop::AllEvents | QEventLoop::ExcludeUserInputEvents| QEventLoop::ExcludeSocketNotifiers);
+    QTest::qWait(50);
+
+    QTimer::singleShot(4000, &loop, SLOT(quit()));
+    QBENCHMARK {
+        sb->setSliderPosition(sliderTarget);
+        loop.exec(QEventLoop::AllEvents | QEventLoop::ExcludeUserInputEvents| QEventLoop::ExcludeSocketNotifiers);
+    }
+}
+
+QTEST_MAIN(tst_GraphicsViewBenchmark)
+#include "main.moc"