Merge branch '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-2 into 4.7-integration

* '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-2:
  Keyboard navigation regression in QTreeView
  Implement the general blending of ARGB32_pm with SSSE3
  QtDeclarative debugging: Add an option not to stream the properties of an object.

9 files changed, 463 insertions, 10 deletions

diff --git a/src/declarative/debugger/qdeclarativedebug.cpp b/src/declarative/debugger/qdeclarativedebug.cpp
index b950aef..154df51 100644
--- a/src/declarative/debugger/qdeclarativedebug.cpp
+++ b/src/declarative/debugger/qdeclarativedebug.cpp
@@ -507,7 +507,7 @@ QDeclarativeDebugObjectQuery *QDeclarativeEngineDebug::queryObject(const QDeclar
         QByteArray message;
         QDataStream ds(&message, QIODevice::WriteOnly);
         ds << QByteArray("FETCH_OBJECT") << queryId << object.debugId() 
-           << false;
+           << false << true;
         d->client->sendMessage(message);
     } else {
         query->m_state = QDeclarativeDebugQuery::Error;
@@ -530,7 +530,7 @@ QDeclarativeDebugObjectQuery *QDeclarativeEngineDebug::queryObjectRecursive(cons
         QByteArray message;
         QDataStream ds(&message, QIODevice::WriteOnly);
         ds << QByteArray("FETCH_OBJECT") << queryId << object.debugId() 
-           << true;
+           << true << true;
         d->client->sendMessage(message);
     } else {
         query->m_state = QDeclarativeDebugQuery::Error;
diff --git a/src/declarative/qml/qdeclarativeenginedebug.cpp b/src/declarative/qml/qdeclarativeenginedebug.cpp
index 1837366..ed98e3c 100644
--- a/src/declarative/qml/qdeclarativeenginedebug.cpp
+++ b/src/declarative/qml/qdeclarativeenginedebug.cpp
@@ -182,7 +182,7 @@ QVariant QDeclarativeEngineDebugServer::valueContents(const QVariant &value) con
 }
 
 void QDeclarativeEngineDebugServer::buildObjectDump(QDataStream &message, 
-                                           QObject *object, bool recur)
+                                           QObject *object, bool recur, bool dumpProperties)
 {
     message << objectData(object);
 
@@ -209,6 +209,8 @@ void QDeclarativeEngineDebugServer::buildObjectDump(QDataStream &message,
             continue;
         QDeclarativeBoundSignal *signal = QDeclarativeBoundSignal::cast(child);
         if (signal) {
+            if (!dumpProperties)
+                continue;
             QDeclarativeObjectProperty prop;
             prop.type = QDeclarativeObjectProperty::SignalProperty;
             prop.hasNotifySignal = false;
@@ -229,12 +231,17 @@ void QDeclarativeEngineDebugServer::buildObjectDump(QDataStream &message,
             fakeProperties << prop;
         } else {
             if (recur)
-                buildObjectDump(message, child, recur);
+                buildObjectDump(message, child, recur, dumpProperties);
             else
                 message << objectData(child);
         }
     }
 
+    if (!dumpProperties) {
+        message << 0;
+        return;
+    }
+
     message << (object->metaObject()->propertyCount() + fakeProperties.count());
 
     for (int ii = 0; ii < object->metaObject()->propertyCount(); ++ii) 
@@ -372,8 +379,9 @@ void QDeclarativeEngineDebugServer::messageReceived(const QByteArray &message)
         int queryId;
         int objectId;
         bool recurse;
+        bool dumpProperties = true;
 
-        ds >> queryId >> objectId >> recurse;
+        ds >> queryId >> objectId >> recurse >> dumpProperties;
 
         QObject *object = QDeclarativeDebugService::objectForId(objectId);
 
@@ -382,7 +390,7 @@ void QDeclarativeEngineDebugServer::messageReceived(const QByteArray &message)
         rs << QByteArray("FETCH_OBJECT_R") << queryId;
 
         if (object) 
-            buildObjectDump(rs, object, recurse);
+            buildObjectDump(rs, object, recurse, dumpProperties);
 
         sendMessage(reply);
     } else if (type == "WATCH_OBJECT") {
diff --git a/src/declarative/qml/qdeclarativeenginedebug_p.h b/src/declarative/qml/qdeclarativeenginedebug_p.h
index ea35b40..aa450f3 100644
--- a/src/declarative/qml/qdeclarativeenginedebug_p.h
+++ b/src/declarative/qml/qdeclarativeenginedebug_p.h
@@ -103,7 +103,7 @@ private Q_SLOTS:
 
 private:
     void buildObjectList(QDataStream &, QDeclarativeContext *);
-    void buildObjectDump(QDataStream &, QObject *, bool);
+    void buildObjectDump(QDataStream &, QObject *, bool, bool);
     QDeclarativeObjectData objectData(QObject *);
     QDeclarativeObjectProperty propertyData(QObject *, int);
     QVariant valueContents(const QVariant &defaultValue) const;
diff --git a/src/gui/itemviews/qabstractitemview.cpp b/src/gui/itemviews/qabstractitemview.cpp
index 97499f3..4ffd284 100644
--- a/src/gui/itemviews/qabstractitemview.cpp
+++ b/src/gui/itemviews/qabstractitemview.cpp
@@ -2270,9 +2270,11 @@ void QAbstractItemView::keyPressEvent(QKeyEvent *event)
             } else {
                 d->selectionModel->setCurrentIndex(newCurrent, command);
                 d->pressedPosition = visualRect(newCurrent).center() + d->offset();
-                // We copy the same behaviour as for mousePressEvent().
-                QRect rect(d->pressedPosition - d->offset(), QSize(1, 1));
-                setSelection(rect, command);
+                if (newCurrent.isValid()) {
+                    // We copy the same behaviour as for mousePressEvent().
+                    QRect rect(d->pressedPosition - d->offset(), QSize(1, 1));
+                    setSelection(rect, command);
+                }
             }
             event->accept();
             return;
diff --git a/src/gui/painting/painting.pri b/src/gui/painting/painting.pri
index dfa4a48..793d380 100644
--- a/src/gui/painting/painting.pri
+++ b/src/gui/painting/painting.pri
@@ -212,6 +212,7 @@ if(mmx|3dnow|sse|sse2|iwmmxt) {
     SSE3DNOW_SOURCES += painting/qdrawhelper_sse3dnow.cpp
     SSE_SOURCES += painting/qdrawhelper_sse.cpp
     SSE2_SOURCES += painting/qdrawhelper_sse2.cpp
+    SSSE3_SOURCES += painting/qdrawhelper_ssse3.cpp
     IWMMXT_SOURCES += painting/qdrawhelper_iwmmxt.cpp
 }
 
diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index 1ff3d7b..276da93 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -7840,6 +7840,17 @@ void qInitDrawhelperAsm()
             qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_RGB32] = qt_blend_rgb32_on_rgb32_sse2;
             qBlendFunctions[QImage::Format_RGB32][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse2;
             qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_sse2;
+
+#if defined(QT_HAVE_SSSE3)
+            if (features & SSSE3) {
+                extern void qt_blend_argb32_on_argb32_ssse3(uchar *destPixels, int dbpl,
+                                                            const uchar *srcPixels, int sbpl,
+                                                            int w, int h,
+                                                            int const_alpha);
+                qBlendFunctions[QImage::Format_RGB32][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_ssse3;
+                qBlendFunctions[QImage::Format_ARGB32_Premultiplied][QImage::Format_ARGB32_Premultiplied] = qt_blend_argb32_on_argb32_ssse3;
+            }
+#endif // QT_HAVE_SSSE3
         } else
 #endif
         {
diff --git a/src/gui/painting/qdrawhelper_ssse3.cpp b/src/gui/painting/qdrawhelper_ssse3.cpp
new file mode 100644
index 0000000..bc4a7eb8
--- /dev/null
+++ b/src/gui/painting/qdrawhelper_ssse3.cpp
@@ -0,0 +1,263 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+#ifdef QT_HAVE_SSSE3
+
+#include <private/qsimd_p.h>
+#include <private/qdrawhelper_x86_p.h>
+#include <private/qdrawingprimitive_sse2_p.h>
+
+QT_BEGIN_NAMESPACE
+
+inline static void blend_pixel(quint32 &dst, const quint32 src)
+{
+    if (src >= 0xff000000)
+        dst = src;
+    else if (src != 0)
+        dst = src + BYTE_MUL(dst, qAlpha(~src));
+}
+
+
+/* The instruction palignr uses direct arguments, so we have to generate the code fo the different
+   shift (4, 8, 12). Checking the alignment inside the loop is unfortunatelly way too slow.
+ */
+#define BLENDING_LOOP(palignrOffset, length)\
+    for (; x < length-3; x += 4) { \
+        const __m128i srcVectorLastLoaded = _mm_load_si128((__m128i *)&src[x - minusOffsetToAlignSrcOn16Bytes + 4]);\
+        const __m128i srcVector = _mm_alignr_epi8(srcVectorLastLoaded, srcVectorPrevLoaded, palignrOffset); \
+        const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask); \
+        if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) { \
+            _mm_store_si128((__m128i *)&dst[x], srcVector); \
+        } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) { \
+            __m128i alphaChannel = _mm_shuffle_epi8(srcVector, alphaShuffleMask); \
+            alphaChannel = _mm_sub_epi16(one, alphaChannel); \
+            const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \
+            __m128i destMultipliedByOneMinusAlpha; \
+            BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \
+            const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \
+            _mm_store_si128((__m128i *)&dst[x], result); \
+        } \
+        srcVectorPrevLoaded = srcVectorLastLoaded;\
+    }
+
+
+#define BLEND_SOURCE_OVER_ARGB32_FIRST_ROW_SSSE3(dst, src, length, nullVector, half, one, colorMask, alphaMask) { \
+    int x = 0; \
+\
+    /* First, get dst aligned. */ \
+    const int offsetToAlignOn16Bytes = (4 - ((reinterpret_cast<quintptr>(dst) >> 2) & 0x3)) & 0x3;\
+    const int prologLength = qMin(length, offsetToAlignOn16Bytes);\
+\
+    for (; x < prologLength; ++x) {\
+        blend_pixel(dst[x], src[x]); \
+    } \
+\
+    const int minusOffsetToAlignSrcOn16Bytes = (reinterpret_cast<quintptr>(&(src[x])) >> 2) & 0x3;\
+\
+    if (!minusOffsetToAlignSrcOn16Bytes) {\
+        /* src is aligned, usual algorithm but with aligned operations.\
+           See the SSE2 version for more documentation on the algorithm itself. */\
+        const __m128i alphaShuffleMask = _mm_set_epi8(0xff,15,0xff,15,0xff,11,0xff,11,0xff,7,0xff,7,0xff,3,0xff,3);\
+        for (; x < length-3; x += 4) { \
+            const __m128i srcVector = _mm_load_si128((__m128i *)&src[x]); \
+            const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask); \
+            if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) { \
+                _mm_store_si128((__m128i *)&dst[x], srcVector); \
+            } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) { \
+                __m128i alphaChannel = _mm_shuffle_epi8(srcVector, alphaShuffleMask); \
+                alphaChannel = _mm_sub_epi16(one, alphaChannel); \
+                const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \
+                __m128i destMultipliedByOneMinusAlpha; \
+                BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \
+                const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \
+                _mm_store_si128((__m128i *)&dst[x], result); \
+            } \
+        } /* end for() */\
+    } else if ((length - x) >= 8) {\
+        /* We are at the first line, so "x - minusOffsetToAlignSrcOn16Bytes" could go before src, and\
+           generate an invalid access. */\
+\
+        /* We use two vectors to extract the src: prevLoaded for the first pixels, lastLoaded for the current pixels. */\
+        __m128i srcVectorPrevLoaded;\
+        if (minusOffsetToAlignSrcOn16Bytes <= prologLength) {\
+            srcVectorPrevLoaded = _mm_load_si128((__m128i *)&src[x - minusOffsetToAlignSrcOn16Bytes]);\
+        } else {\
+            quint32 temp[4] Q_DECL_ALIGN(16);\
+            switch (prologLength) {\
+                case 3:\
+                    temp[1] = src[x - 3];\
+                case 2:\
+                    temp[2] = src[x - 2];\
+                case 1:\
+                    temp[3] = src[x - 1];\
+                default:\
+                    break;\
+            }\
+            srcVectorPrevLoaded = _mm_load_si128((__m128i *)temp);\
+        }\
+        const int palignrOffset = minusOffsetToAlignSrcOn16Bytes << 2;\
+\
+        const __m128i alphaShuffleMask = _mm_set_epi8(0xff,15,0xff,15,0xff,11,0xff,11,0xff,7,0xff,7,0xff,3,0xff,3);\
+        switch (palignrOffset) {\
+        case 4:\
+            BLENDING_LOOP(4, length)\
+            break;\
+        case 8:\
+            BLENDING_LOOP(8, length)\
+            break;\
+        case 12:\
+            BLENDING_LOOP(12, length)\
+            break;\
+        }\
+    }\
+    for (; x < length; ++x) \
+        blend_pixel(dst[x], src[x]); \
+}
+
+// Basically blend src over dst with the const alpha defined as constAlphaVector.
+// nullVector, half, one, colorMask are constant accross the whole image/texture, and should be defined as:
+//const __m128i nullVector = _mm_set1_epi32(0);
+//const __m128i half = _mm_set1_epi16(0x80);
+//const __m128i one = _mm_set1_epi16(0xff);
+//const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
+//const __m128i alphaMask = _mm_set1_epi32(0xff000000);
+//
+// The computation being done is:
+// result = s + d * (1-alpha)
+// with shortcuts if fully opaque or fully transparent.
+#define BLEND_SOURCE_OVER_ARGB32_MAIN_SSSE3(dst, src, length, nullVector, half, one, colorMask, alphaMask) { \
+    int x = 0; \
+\
+    /* First, get dst aligned. */ \
+    ALIGNMENT_PROLOGUE_16BYTES(dst, x, length) { \
+        blend_pixel(dst[x], src[x]); \
+    } \
+\
+    const int minusOffsetToAlignSrcOn16Bytes = (reinterpret_cast<quintptr>(&(src[x])) >> 2) & 0x3;\
+\
+    if (!minusOffsetToAlignSrcOn16Bytes) {\
+        /* src is aligned, usual algorithm but with aligned operations.\
+           See the SSE2 version for more documentation on the algorithm itself. */\
+        const __m128i alphaShuffleMask = _mm_set_epi8(0xff,15,0xff,15,0xff,11,0xff,11,0xff,7,0xff,7,0xff,3,0xff,3);\
+        for (; x < length-3; x += 4) { \
+            const __m128i srcVector = _mm_load_si128((__m128i *)&src[x]); \
+            const __m128i srcVectorAlpha = _mm_and_si128(srcVector, alphaMask); \
+            if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, alphaMask)) == 0xffff) { \
+                _mm_store_si128((__m128i *)&dst[x], srcVector); \
+            } else if (_mm_movemask_epi8(_mm_cmpeq_epi32(srcVectorAlpha, nullVector)) != 0xffff) { \
+                __m128i alphaChannel = _mm_shuffle_epi8(srcVector, alphaShuffleMask); \
+                alphaChannel = _mm_sub_epi16(one, alphaChannel); \
+                const __m128i dstVector = _mm_load_si128((__m128i *)&dst[x]); \
+                __m128i destMultipliedByOneMinusAlpha; \
+                BYTE_MUL_SSE2(destMultipliedByOneMinusAlpha, dstVector, alphaChannel, colorMask, half); \
+                const __m128i result = _mm_add_epi8(srcVector, destMultipliedByOneMinusAlpha); \
+                _mm_store_si128((__m128i *)&dst[x], result); \
+            } \
+        } /* end for() */\
+    } else if ((length - x) >= 8) {\
+        /* We use two vectors to extract the src: prevLoaded for the first pixels, lastLoaded for the current pixels. */\
+        __m128i srcVectorPrevLoaded = _mm_load_si128((__m128i *)&src[x - minusOffsetToAlignSrcOn16Bytes]);\
+        const int palignrOffset = minusOffsetToAlignSrcOn16Bytes << 2;\
+\
+        const __m128i alphaShuffleMask = _mm_set_epi8(0xff,15,0xff,15,0xff,11,0xff,11,0xff,7,0xff,7,0xff,3,0xff,3);\
+        switch (palignrOffset) {\
+        case 4:\
+            BLENDING_LOOP(4, length)\
+            break;\
+        case 8:\
+            BLENDING_LOOP(8, length)\
+            break;\
+        case 12:\
+            BLENDING_LOOP(12, length)\
+            break;\
+        }\
+    }\
+    for (; x < length; ++x) \
+        blend_pixel(dst[x], src[x]); \
+}
+
+void qt_blend_argb32_on_argb32_ssse3(uchar *destPixels, int dbpl,
+                                     const uchar *srcPixels, int sbpl,
+                                     int w, int h,
+                                     int const_alpha)
+{
+    const quint32 *src = (const quint32 *) srcPixels;
+    quint32 *dst = (quint32 *) destPixels;
+    if (const_alpha == 256) {
+        const __m128i alphaMask = _mm_set1_epi32(0xff000000);
+        const __m128i nullVector = _mm_setzero_si128();
+        const __m128i half = _mm_set1_epi16(0x80);
+        const __m128i one = _mm_set1_epi16(0xff);
+        const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
+
+        // We have to unrol the first row in order to deal with the load on unaligned data
+        // prior to the src pointer.
+        BLEND_SOURCE_OVER_ARGB32_FIRST_ROW_SSSE3(dst, src, w, nullVector, half, one, colorMask, alphaMask);
+        dst = (quint32 *)(((uchar *) dst) + dbpl);
+        src = (const quint32 *)(((const uchar *) src) + sbpl);
+
+        for (int y = 1; y < h; ++y) {
+            BLEND_SOURCE_OVER_ARGB32_MAIN_SSSE3(dst, src, w, nullVector, half, one, colorMask, alphaMask);
+            dst = (quint32 *)(((uchar *) dst) + dbpl);
+            src = (const quint32 *)(((const uchar *) src) + sbpl);
+        }
+    } else if (const_alpha != 0) {
+        // dest = (s + d * sia) * ca + d * cia
+        //      = s * ca + d * (sia * ca + cia)
+        //      = s * ca + d * (1 - sa*ca)
+        const_alpha = (const_alpha * 255) >> 8;
+        const __m128i nullVector = _mm_setzero_si128();
+        const __m128i half = _mm_set1_epi16(0x80);
+        const __m128i one = _mm_set1_epi16(0xff);
+        const __m128i colorMask = _mm_set1_epi32(0x00ff00ff);
+        const __m128i constAlphaVector = _mm_set1_epi16(const_alpha);
+        for (int y = 0; y < h; ++y) {
+            BLEND_SOURCE_OVER_ARGB32_WITH_CONST_ALPHA_SSE2(dst, src, w, nullVector, half, one, colorMask, constAlphaVector)
+            dst = (quint32 *)(((uchar *) dst) + dbpl);
+            src = (const quint32 *)(((const uchar *) src) + sbpl);
+        }
+    }
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_HAVE_SSSE3
diff --git a/tests/auto/qtreeview/tst_qtreeview.cpp b/tests/auto/qtreeview/tst_qtreeview.cpp
index 75a4c62..7e2e800 100644
--- a/tests/auto/qtreeview/tst_qtreeview.cpp
+++ b/tests/auto/qtreeview/tst_qtreeview.cpp
@@ -239,6 +239,7 @@ private slots:
     void doubleClickedWithSpans();
     void taskQTBUG_6450_selectAllWith1stColumnHidden();
     void taskQTBUG_9216_setSizeAndUniformRowHeightsWrongRepaint();
+    void taskQTBUG_11466_keyboardNavigationRegression();
 };
 
 class QtTestModel: public QAbstractItemModel
@@ -3785,5 +3786,129 @@ void tst_QTreeView::keyboardNavigationWithDisabled()
     QCOMPARE(view.currentIndex(), model.index(6, 0));
 }
 
+class Model_11466 : public QAbstractItemModel
+{
+    Q_OBJECT
+public:
+    Model_11466(QObject *parent) :
+        m_block(false)
+    {
+        // set up the model to have two top level items and a few others
+        m_selectionModel = new QItemSelectionModel(this, this); // owned by this
+
+        connect(m_selectionModel, SIGNAL(currentChanged(const QModelIndex &,const QModelIndex &)),
+                this, SLOT(slotCurrentChanged(const QModelIndex &,const QModelIndex &)));
+    };
+
+    int rowCount(const QModelIndex &parent) const
+    {
+        if (parent.isValid())
+            return (parent.internalId() == 0) ? 4 : 0;
+        return 2; // two top level items
+    }
+
+    int columnCount(const QModelIndex &parent) const
+    {
+        return 2;
+    }
+
+    QVariant data(const QModelIndex &index, int role) const
+    {
+        if (role == Qt::DisplayRole && index.isValid()) {
+            qint64 parentRowPlusOne = index.internalId();
+            QString str;
+            QTextStream stream(&str);
+            if (parentRowPlusOne > 0)
+                stream << parentRowPlusOne << " -> " << index.row() << " : " << index.column();
+            else
+                stream << index.row() << " : " << index.column();
+            return QVariant(str);
+        }
+        return QVariant();
+    }
+
+    QModelIndex parent(const QModelIndex &index) const
+    {
+        if (index.isValid()) {
+            qint64 parentRowPlusOne = index.internalId();
+            if (parentRowPlusOne > 0) {
+                int row = static_cast<int>(parentRowPlusOne - 1);
+                return createIndex(row, 0, (quint32)0);
+            }
+        }
+        return QModelIndex();
+    }
+
+    void bindView(QTreeView *view)
+    {
+        // sets the view to this model with a shared selection model
+        QItemSelectionModel *oldModel = view->selectionModel();
+        if (oldModel != m_selectionModel)
+            delete oldModel;
+        view->setModel(this); // this creates a new selection model for the view, but we dont want it either ...
+        oldModel = view->selectionModel();
+        view->setSelectionModel(m_selectionModel);
+        delete oldModel;
+    }
+
+    QModelIndex index(int row, int column, const QModelIndex &parent) const
+    {
+        return createIndex(row, column, parent.isValid() ? (quint32)(parent.row() + 1) : (quint32)0);
+    }
+
+public slots:
+    void slotCurrentChanged(const QModelIndex &current,const QModelIndex &)
+    {
+        if (m_block)
+            return;
+
+        if (current.isValid()) {
+            int selectedRow = current.row();
+            quint32 parentRowPlusOne = static_cast<quint32>(current.internalId());
+
+            for (int i = 0; i < 2; ++i) {
+                // announce the removal of all non top level items
+                beginRemoveRows(createIndex(i, 0, 0), 0, 3);
+                // nothing to actually do for the removal
+                endRemoveRows();
+
+                // put them back in again
+                beginInsertRows(createIndex(i, 0, 0), 0, 3);
+                // nothing to actually do for the insertion
+                endInsertRows();
+            }
+            // reselect the current item ...
+            QModelIndex selectedIndex = createIndex(selectedRow, 0, parentRowPlusOne);
+
+            m_block = true; // recursion block
+            m_selectionModel->select(selectedIndex, QItemSelectionModel::ClearAndSelect|QItemSelectionModel::Current|QItemSelectionModel::Rows);
+            m_selectionModel->setCurrentIndex(selectedIndex, QItemSelectionModel::NoUpdate);
+            m_block = false;
+        } else {
+            m_selectionModel->clear();
+        }
+    }
+
+private:
+    bool m_block;
+    QItemSelectionModel *m_selectionModel;
+};
+
+void tst_QTreeView::taskQTBUG_11466_keyboardNavigationRegression()
+{
+    QTreeView treeView;
+    treeView.setSelectionBehavior(QAbstractItemView::SelectRows);
+    treeView.setSelectionMode(QAbstractItemView::SingleSelection);
+    Model_11466 model(&treeView);
+    model.bindView(&treeView);
+    treeView.expandAll();
+    treeView.show();
+    QTest::qWaitForWindowShown(&treeView);
+
+    QTest::keyPress(treeView.viewport(), Qt::Key_Down);
+    QTest::qWait(10);
+    QTRY_COMPARE(treeView.currentIndex(), treeView.selectionModel()->selection().indexes().first());
+}
+
 QTEST_MAIN(tst_QTreeView)
 #include "tst_qtreeview.moc"
diff --git a/tests/benchmarks/gui/image/blendbench/main.cpp b/tests/benchmarks/gui/image/blendbench/main.cpp
index f53654b..d420d6c 100644
--- a/tests/benchmarks/gui/image/blendbench/main.cpp
+++ b/tests/benchmarks/gui/image/blendbench/main.cpp
@@ -106,6 +106,9 @@ private slots:
 
     void blendBenchAlpha_data();
     void blendBenchAlpha();
+
+    void unalignedBlendArgb32_data();
+    void unalignedBlendArgb32();
 };
 
 void BlendBench::blendBench_data()
@@ -179,6 +182,46 @@ void BlendBench::blendBenchAlpha()
     }
 }
 
+void BlendBench::unalignedBlendArgb32_data()
+{
+    // The performance of blending can depend of the alignment of the data
+    // on 16 bytes. Some SIMD instruction set have significantly better
+    // memory access when the memory is aligned on 16 bytes boundary.
+
+    // offset in 32 bits words
+    QTest::addColumn<int>("offset");
+    QTest::newRow("aligned on 16 bytes") << 0;
+    QTest::newRow("unaligned by 4 bytes") << 1;
+    QTest::newRow("unaligned by 8 bytes") << 2;
+    QTest::newRow("unaligned by 12 bytes") << 3;
+}
+
+void BlendBench::unalignedBlendArgb32()
+{
+    const int dimension = 1024;
+
+    // We use dst aligned by design. We don't want to test all the combination of alignemnt for src and dst.
+    // Moreover, it make sense for us to align dst in the implementation because it is accessed more often.
+    uchar *dstMemory = static_cast<uchar*>(qMallocAligned((dimension * dimension * sizeof(quint32)), 16));
+    QImage destination(dstMemory, dimension, dimension, QImage::Format_ARGB32_Premultiplied);
+    destination.fill(0x12345678); // avoid special cases of alpha
+
+    uchar *srcMemory = static_cast<uchar*>(qMallocAligned((dimension * dimension * sizeof(quint32)) + 16, 16));
+    QFETCH(int, offset);
+    srcMemory += (offset * sizeof(quint32));
+
+    QImage src(srcMemory, dimension, dimension, QImage::Format_ARGB32_Premultiplied);
+    src.fill(0x87654321);
+
+    QPainter painter(&destination);
+    QBENCHMARK {
+        painter.drawImage(QPoint(), src);
+    }
+
+    qFreeAligned(srcMemory);
+    qFreeAligned(dstMemory);
+}
+
 QTEST_MAIN(BlendBench)
 
 #include "main.moc"