QIcon: move back to QtGui

 -  Move the files and tests
git mv src/widgets/kernel/qicon* qrc/gui/image/
git mv tests/auto/widgets/kernel/qicon/ tests/auto/gui/image/

 - update the include of QIcon
git grep -O"sed -i s,QtWidgets/qicon,QtGui/qicon," "QtWidgets/qicon"
git grep -O"sed -i s,QtWidgets/QIcon,QtGui/QIcon," "QtWidgets/QIcon"

 - Adapt QIcon \ingroup documentation
sed -i s/QtWidgets/QtGui/ src/gui/images/qicon*

 - Adapt export macro
sed -i s/Q_WIDGETS_EXPORT/Q_GUI_EXPORT/g src/gui/image/qicon*

 - Update .pri and .pro files

 - Remove the use of QStyle::alignedRect by copying its content (and
   adapt slightly

 - Use QGuiApplication::palette() instead of QApplication::palette()

 - Add a hook in QGuiApplicationPrivate to call the
   QStyle::generatedIconPixmap() from QtWidgets

Another commit follows to adjust QMetaType::Icon and move the QVariant
and QMetaType icon handler back in QtGui

Change-Id: I1b63759f892ebc02dfc30f41bb6e76e0b7451182
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>

10 files changed, 2782 insertions, 1 deletions

diff --git a/src/gui/image/image.pri b/src/gui/image/image.pri
index 737b7fcbd4..6b306ddaad 100644
--- a/src/gui/image/image.pri
+++ b/src/gui/image/image.pri
@@ -23,6 +23,11 @@ HEADERS += \
         image/qpixmapcache_p.h \
         image/qplatformpixmap.h \
         image/qimagepixmapcleanuphooks_p.h \
+        image/qicon.h \
+        image/qicon_p.h \
+        image/qiconloader_p.h \
+        image/qiconengine.h \
+        image/qiconengineplugin.h \
 
 SOURCES += \
         image/qbitmap.cpp \
@@ -40,7 +45,12 @@ SOURCES += \
         image/qpixmap_raster.cpp \
         image/qpixmap_blitter.cpp \
         image/qnativeimage.cpp \
-        image/qimagepixmapcleanuphooks.cpp
+        image/qimagepixmapcleanuphooks.cpp \
+        image/qicon.cpp \
+        image/qiconloader.cpp \
+        image/qiconengine.cpp \
+        image/qiconengineplugin.cpp \
+
 
 win32: SOURCES += image/qpixmap_win.cpp
 
diff --git a/src/gui/image/qicon.cpp b/src/gui/image/qicon.cpp
new file mode 100644
index 0000000000..c2139c3336
--- /dev/null
+++ b/src/gui/image/qicon.cpp
@@ -0,0 +1,1152 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qicon.h"
+#include "qicon_p.h"
+#include "qiconengine.h"
+#include "qiconengineplugin.h"
+#include "private/qfactoryloader_p.h"
+#include "private/qiconloader_p.h"
+#include "qpainter.h"
+#include "qfileinfo.h"
+#include "qpixmapcache.h"
+#include "qvariant.h"
+#include "qcache.h"
+#include "qdebug.h"
+#include "qpalette.h"
+
+#ifdef Q_WS_MAC
+#include <private/qt_mac_p.h>
+#include <private/qt_cocoa_helpers_mac_p.h>
+#endif
+
+#include "private/qhexstring_p.h"
+#include "private/qguiapplication_p.h"
+
+#ifndef QT_NO_ICON
+QT_BEGIN_NAMESPACE
+
+/*!
+    \enum QIcon::Mode
+
+    This enum type describes the mode for which a pixmap is intended
+    to be used. The currently defined modes are:
+
+    \value Normal
+         Display the pixmap when the user is
+        not interacting with the icon, but the
+        functionality represented by the icon is available.
+    \value Disabled
+         Display the pixmap when the
+        functionality represented by the icon is not available.
+    \value Active
+         Display the pixmap when the
+        functionality represented by the icon is available and
+        the user is interacting with the icon, for example, moving the
+        mouse over it or clicking it.
+   \value Selected
+        Display the pixmap when the item represented by the icon is
+        selected.
+*/
+
+/*!
+  \enum QIcon::State
+
+  This enum describes the state for which a pixmap is intended to be
+  used. The \e state can be:
+
+  \value Off  Display the pixmap when the widget is in an "off" state
+  \value On  Display the pixmap when the widget is in an "on" state
+*/
+
+static QBasicAtomicInt serialNumCounter = Q_BASIC_ATOMIC_INITIALIZER(1);
+
+static void qt_cleanup_icon_cache();
+namespace {
+    struct IconCache : public QCache<QString, QIcon>
+    {
+        IconCache()
+        {
+            // ### note: won't readd if QApplication is re-created!
+            qAddPostRoutine(qt_cleanup_icon_cache);
+        }
+    };
+}
+
+Q_GLOBAL_STATIC(IconCache, qtIconCache)
+
+static void qt_cleanup_icon_cache()
+{
+    qtIconCache()->clear();
+}
+
+QIconPrivate::QIconPrivate()
+    : engine(0), ref(1),
+    serialNum(serialNumCounter.fetchAndAddRelaxed(1)),
+    detach_no(0)
+{
+}
+
+QPixmapIconEngine::QPixmapIconEngine()
+{
+}
+
+QPixmapIconEngine::QPixmapIconEngine(const QPixmapIconEngine &other)
+    : QIconEngine(other), pixmaps(other.pixmaps)
+{
+}
+
+QPixmapIconEngine::~QPixmapIconEngine()
+{
+}
+
+void QPixmapIconEngine::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state)
+{
+    QSize pixmapSize = rect.size();
+#if defined(Q_WS_MAC)
+    pixmapSize *= qt_mac_get_scalefactor();
+#endif
+    painter->drawPixmap(rect, pixmap(pixmapSize, mode, state));
+}
+
+static inline int area(const QSize &s) { return s.width() * s.height(); }
+
+// returns the smallest of the two that is still larger than or equal to size.
+static QPixmapIconEngineEntry *bestSizeMatch( const QSize &size, QPixmapIconEngineEntry *pa, QPixmapIconEngineEntry *pb)
+{
+    int s = area(size);
+    if (pa->size == QSize() && pa->pixmap.isNull()) {
+        pa->pixmap = QPixmap(pa->fileName);
+        pa->size = pa->pixmap.size();
+    }
+    int a = area(pa->size);
+    if (pb->size == QSize() && pb->pixmap.isNull()) {
+        pb->pixmap = QPixmap(pb->fileName);
+        pb->size = pb->pixmap.size();
+    }
+    int b = area(pb->size);
+    int res = a;
+    if (qMin(a,b) >= s)
+        res = qMin(a,b);
+    else
+        res = qMax(a,b);
+    if (res == a)
+        return pa;
+    return pb;
+}
+
+QPixmapIconEngineEntry *QPixmapIconEngine::tryMatch(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+    QPixmapIconEngineEntry *pe = 0;
+    for (int i = 0; i < pixmaps.count(); ++i)
+        if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) {
+            if (pe)
+                pe = bestSizeMatch(size, &pixmaps[i], pe);
+            else
+                pe = &pixmaps[i];
+        }
+    return pe;
+}
+
+
+QPixmapIconEngineEntry *QPixmapIconEngine::bestMatch(const QSize &size, QIcon::Mode mode, QIcon::State state, bool sizeOnly)
+{
+    QPixmapIconEngineEntry *pe = tryMatch(size, mode, state);
+    while (!pe){
+        QIcon::State oppositeState = (state == QIcon::On) ? QIcon::Off : QIcon::On;
+        if (mode == QIcon::Disabled || mode == QIcon::Selected) {
+            QIcon::Mode oppositeMode = (mode == QIcon::Disabled) ? QIcon::Selected : QIcon::Disabled;
+            if ((pe = tryMatch(size, QIcon::Normal, state)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Active, state)))
+                break;
+            if ((pe = tryMatch(size, mode, oppositeState)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Normal, oppositeState)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Active, oppositeState)))
+                break;
+            if ((pe = tryMatch(size, oppositeMode, state)))
+                break;
+            if ((pe = tryMatch(size, oppositeMode, oppositeState)))
+                break;
+        } else {
+            QIcon::Mode oppositeMode = (mode == QIcon::Normal) ? QIcon::Active : QIcon::Normal;
+            if ((pe = tryMatch(size, oppositeMode, state)))
+                break;
+            if ((pe = tryMatch(size, mode, oppositeState)))
+                break;
+            if ((pe = tryMatch(size, oppositeMode, oppositeState)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Disabled, state)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Selected, state)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Disabled, oppositeState)))
+                break;
+            if ((pe = tryMatch(size, QIcon::Selected, oppositeState)))
+                break;
+        }
+
+        if (!pe)
+            return pe;
+    }
+
+    if (sizeOnly ? (pe->size.isNull() || !pe->size.isValid()) : pe->pixmap.isNull()) {
+        pe->pixmap = QPixmap(pe->fileName);
+        if (!pe->pixmap.isNull())
+            pe->size = pe->pixmap.size();
+    }
+
+    return pe;
+}
+
+QPixmap QPixmapIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+    QPixmap pm;
+    QPixmapIconEngineEntry *pe = bestMatch(size, mode, state, false);
+    if (pe)
+        pm = pe->pixmap;
+
+    if (pm.isNull()) {
+        int idx = pixmaps.count();
+        while (--idx >= 0) {
+            if (pe == &pixmaps[idx]) {
+                pixmaps.remove(idx);
+                break;
+            }
+        }
+        if (pixmaps.isEmpty())
+            return pm;
+        else
+            return pixmap(size, mode, state);
+    }
+
+    QSize actualSize = pm.size();
+    if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height()))
+        actualSize.scale(size, Qt::KeepAspectRatio);
+
+    QString key = QLatin1String("qt_")
+                  % HexString<quint64>(pm.cacheKey())
+                  % HexString<uint>(pe->mode)
+                  % HexString<quint64>(QGuiApplication::palette().cacheKey())
+                  % HexString<uint>(actualSize.width())
+                  % HexString<uint>(actualSize.height());
+
+    if (mode == QIcon::Active) {
+        if (QPixmapCache::find(key % HexString<uint>(mode), pm))
+            return pm; // horray
+        if (QPixmapCache::find(key % HexString<uint>(QIcon::Normal), pm)) {
+            QPixmap active = pm;
+            if (QGuiApplication *guiApp = qobject_cast<QGuiApplication *>(qApp))
+                active = static_cast<QGuiApplicationPrivate*>(QObjectPrivate::get(guiApp))->applyQIconStyleHelper(QIcon::Active, pm);
+            if (pm.cacheKey() == active.cacheKey())
+                return pm;
+        }
+    }
+
+    if (!QPixmapCache::find(key % HexString<uint>(mode), pm)) {
+        if (pm.size() != actualSize)
+            pm = pm.scaled(actualSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+        if (pe->mode != mode && mode != QIcon::Normal) {
+            QPixmap generated = pm;
+            if (QGuiApplication *guiApp = qobject_cast<QGuiApplication *>(qApp))
+                generated = static_cast<QGuiApplicationPrivate*>(QObjectPrivate::get(guiApp))->applyQIconStyleHelper(mode, pm);
+            if (!generated.isNull())
+                pm = generated;
+        }
+        QPixmapCache::insert(key % HexString<uint>(mode), pm);
+    }
+    return pm;
+}
+
+QSize QPixmapIconEngine::actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+    QSize actualSize;
+    if (QPixmapIconEngineEntry *pe = bestMatch(size, mode, state, true))
+        actualSize = pe->size;
+
+    if (actualSize.isNull())
+        return actualSize;
+
+    if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height()))
+        actualSize.scale(size, Qt::KeepAspectRatio);
+    return actualSize;
+}
+
+void QPixmapIconEngine::addPixmap(const QPixmap &pixmap, QIcon::Mode mode, QIcon::State state)
+{
+    if (!pixmap.isNull()) {
+        QPixmapIconEngineEntry *pe = tryMatch(pixmap.size(), mode, state);
+        if(pe && pe->size == pixmap.size()) {
+            pe->pixmap = pixmap;
+            pe->fileName.clear();
+        } else {
+            pixmaps += QPixmapIconEngineEntry(pixmap, mode, state);
+        }
+    }
+}
+
+void QPixmapIconEngine::addFile(const QString &fileName, const QSize &_size, QIcon::Mode mode, QIcon::State state)
+{
+    if (!fileName.isEmpty()) {
+        QSize size = _size;
+        QPixmap pixmap;
+
+        QString abs = fileName;
+        if (fileName.at(0) != QLatin1Char(':'))
+            abs = QFileInfo(fileName).absoluteFilePath();
+
+        for (int i = 0; i < pixmaps.count(); ++i) {
+            if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) {
+                QPixmapIconEngineEntry *pe = &pixmaps[i];
+                if(size == QSize()) {
+                    pixmap = QPixmap(abs);
+                    size = pixmap.size();
+                }
+                if (pe->size == QSize() && pe->pixmap.isNull()) {
+                    pe->pixmap = QPixmap(pe->fileName);
+                    pe->size = pe->pixmap.size();
+                }
+                if(pe->size == size) {
+                    pe->pixmap = pixmap;
+                    pe->fileName = abs;
+                    return;
+                }
+            }
+        }
+        QPixmapIconEngineEntry e(abs, size, mode, state);
+        e.pixmap = pixmap;
+        pixmaps += e;
+    }
+}
+
+QString QPixmapIconEngine::key() const
+{
+    return QLatin1String("QPixmapIconEngine");
+}
+
+QIconEngine *QPixmapIconEngine::clone() const
+{
+    return new QPixmapIconEngine(*this);
+}
+
+bool QPixmapIconEngine::read(QDataStream &in)
+{
+    int num_entries;
+    QPixmap pm;
+    QString fileName;
+    QSize sz;
+    uint mode;
+    uint state;
+
+    in >> num_entries;
+    for (int i=0; i < num_entries; ++i) {
+        if (in.atEnd()) {
+            pixmaps.clear();
+            return false;
+        }
+        in >> pm;
+        in >> fileName;
+        in >> sz;
+        in >> mode;
+        in >> state;
+        if (pm.isNull()) {
+            addFile(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
+        } else {
+            QPixmapIconEngineEntry pe(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
+            pe.pixmap = pm;
+            pixmaps += pe;
+        }
+    }
+    return true;
+}
+
+bool QPixmapIconEngine::write(QDataStream &out) const
+{
+    int num_entries = pixmaps.size();
+    out << num_entries;
+    for (int i=0; i < num_entries; ++i) {
+        if (pixmaps.at(i).pixmap.isNull())
+            out << QPixmap(pixmaps.at(i).fileName);
+        else
+            out << pixmaps.at(i).pixmap;
+        out << pixmaps.at(i).fileName;
+        out << pixmaps.at(i).size;
+        out << (uint) pixmaps.at(i).mode;
+        out << (uint) pixmaps.at(i).state;
+    }
+    return true;
+}
+
+void QPixmapIconEngine::virtual_hook(int id, void *data)
+{
+    switch (id) {
+    case QIconEngine::AvailableSizesHook: {
+        QIconEngine::AvailableSizesArgument &arg =
+            *reinterpret_cast<QIconEngine::AvailableSizesArgument*>(data);
+        arg.sizes.clear();
+        for (int i = 0; i < pixmaps.size(); ++i) {
+            QPixmapIconEngineEntry &pe = pixmaps[i];
+            if (pe.size == QSize() && pe.pixmap.isNull()) {
+                pe.pixmap = QPixmap(pe.fileName);
+                pe.size = pe.pixmap.size();
+            }
+            if (pe.mode == arg.mode && pe.state == arg.state && !pe.size.isEmpty())
+                arg.sizes.push_back(pe.size);
+        }
+        break;
+    }
+    default:
+        QIconEngine::virtual_hook(id, data);
+    }
+}
+
+#ifndef QT_NO_LIBRARY
+Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
+    (QIconEngineFactoryInterface_iid, QLatin1String("/iconengines"), Qt::CaseInsensitive))
+#endif
+
+
+
+/*!
+  \class QIcon
+
+  \brief The QIcon class provides scalable icons in different modes
+  and states.
+
+  \ingroup painting
+  \ingroup shared
+  \inmodule QtGui
+
+  A QIcon can generate smaller, larger, active, and disabled pixmaps
+  from the set of pixmaps it is given. Such pixmaps are used by Qt
+  widgets to show an icon representing a particular action.
+
+  The simplest use of QIcon is to create one from a QPixmap file or
+  resource, and then use it, allowing Qt to work out all the required
+  icon styles and sizes. For example:
+
+  \snippet code/src_gui_image_qicon.cpp 0
+
+  To undo a QIcon, simply set a null icon in its place:
+
+  \snippet code/src_gui_image_qicon.cpp 1
+
+  Use the QImageReader::supportedImageFormats() and
+  QImageWriter::supportedImageFormats() functions to retrieve a
+  complete list of the supported file formats.
+
+  When you retrieve a pixmap using pixmap(QSize, Mode, State), and no
+  pixmap for this given size, mode and state has been added with
+  addFile() or addPixmap(), then QIcon will generate one on the
+  fly. This pixmap generation happens in a QIconEngineV2. The default
+  engine scales pixmaps down if required, but never up, and it uses
+  the current style to calculate a disabled appearance. By using
+  custom icon engines, you can customize every aspect of generated
+  icons. With QIconEnginePluginV2 it is possible to register different
+  icon engines for different file suffixes, making it possible for
+  third parties to provide additional icon engines to those included
+  with Qt.
+
+  \note Since Qt 4.2, an icon engine that supports SVG is included.
+
+  \section1 Making Classes that Use QIcon
+
+  If you write your own widgets that have an option to set a small
+  pixmap, consider allowing a QIcon to be set for that pixmap.  The
+  Qt class QToolButton is an example of such a widget.
+
+  Provide a method to set a QIcon, and when you draw the icon, choose
+  whichever pixmap is appropriate for the current state of your widget.
+  For example:
+  \snippet code/src_gui_image_qicon.cpp 2
+
+  You might also make use of the \c Active mode, perhaps making your
+  widget \c Active when the mouse is over the widget (see \l
+  QWidget::enterEvent()), while the mouse is pressed pending the
+  release that will activate the function, or when it is the currently
+  selected item. If the widget can be toggled, the "On" mode might be
+  used to draw a different icon.
+
+  \img icon.png QIcon
+
+  \sa {fowler}{GUI Design Handbook: Iconic Label}, {Icons Example}
+*/
+
+
+/*!
+  Constructs a null icon.
+*/
+QIcon::QIcon()
+    : d(0)
+{
+}
+
+/*!
+  Constructs an icon from a \a pixmap.
+ */
+QIcon::QIcon(const QPixmap &pixmap)
+    :d(0)
+{
+    addPixmap(pixmap);
+}
+
+/*!
+  Constructs a copy of \a other. This is very fast.
+*/
+QIcon::QIcon(const QIcon &other)
+    :d(other.d)
+{
+    if (d)
+        d->ref.ref();
+}
+
+/*!
+    Constructs an icon from the file with the given \a fileName. The
+    file will be loaded on demand.
+
+    If \a fileName contains a relative path (e.g. the filename only)
+    the relevant file must be found relative to the runtime working
+    directory.
+
+    The file name can be either refer to an actual file on disk or to
+    one of the application's embedded resources.  See the
+    \l{resources.html}{Resource System} overview for details on how to
+    embed images and other resource files in the application's
+    executable.
+
+    Use the QImageReader::supportedImageFormats() and
+    QImageWriter::supportedImageFormats() functions to retrieve a
+    complete list of the supported file formats.
+*/
+QIcon::QIcon(const QString &fileName)
+    : d(0)
+{
+    addFile(fileName);
+}
+
+
+/*!
+    Creates an icon with a specific icon \a engine. The icon takes
+    ownership of the engine.
+*/
+QIcon::QIcon(QIconEngine *engine)
+    :d(new QIconPrivate)
+{
+    d->engine = engine;
+}
+
+/*!
+    Destroys the icon.
+*/
+QIcon::~QIcon()
+{
+    if (d && !d->ref.deref())
+        delete d;
+}
+
+/*!
+    Assigns the \a other icon to this icon and returns a reference to
+    this icon.
+*/
+QIcon &QIcon::operator=(const QIcon &other)
+{
+    if (other.d)
+        other.d->ref.ref();
+    if (d && !d->ref.deref())
+        delete d;
+    d = other.d;
+    return *this;
+}
+
+/*!
+    \fn void QIcon::swap(QIcon &other)
+    \since 4.8
+
+    Swaps icon \a other with this icon. This operation is very
+    fast and never fails.
+*/
+
+/*!
+   Returns the icon as a QVariant.
+*/
+QIcon::operator QVariant() const
+{
+    return QVariant(QVariant::Icon, this);
+}
+
+/*! \fn int QIcon::serialNumber() const
+    \obsolete
+
+    Returns a number that identifies the contents of this
+    QIcon object. Distinct QIcon objects can have
+    the same serial number if they refer to the same contents
+    (but they don't have to). Also, the serial number of
+    a QIcon object may change during its lifetime.
+
+    Use cacheKey() instead.
+
+    A null icon always has a serial number of 0.
+
+    Serial numbers are mostly useful in conjunction with caching.
+
+    \sa QPixmap::serialNumber()
+*/
+
+/*!
+    Returns a number that identifies the contents of this QIcon
+    object. Distinct QIcon objects can have the same key if
+    they refer to the same contents.
+    \since 4.3
+
+    The cacheKey() will change when the icon is altered via
+    addPixmap() or addFile().
+
+    Cache keys are mostly useful in conjunction with caching.
+
+    \sa QPixmap::cacheKey()
+*/
+qint64 QIcon::cacheKey() const
+{
+    if (!d)
+        return 0;
+    return (((qint64) d->serialNum) << 32) | ((qint64) (d->detach_no));
+}
+
+/*!
+  Returns a pixmap with the requested \a size, \a mode, and \a
+  state, generating one if necessary. The pixmap might be smaller than
+  requested, but never larger.
+
+  \sa actualSize(), paint()
+*/
+QPixmap QIcon::pixmap(const QSize &size, Mode mode, State state) const
+{
+    if (!d)
+        return QPixmap();
+    return d->engine->pixmap(size, mode, state);
+}
+
+/*!
+    \fn QPixmap QIcon::pixmap(int w, int h, Mode mode = Normal, State state = Off) const
+
+    \overload
+
+    Returns a pixmap of size QSize(\a w, \a h). The pixmap might be smaller than
+    requested, but never larger.
+*/
+
+/*!
+    \fn QPixmap QIcon::pixmap(int extent, Mode mode = Normal, State state = Off) const
+
+    \overload
+
+    Returns a pixmap of size QSize(\a extent, \a extent). The pixmap might be smaller
+    than requested, but never larger.
+*/
+
+/*!  Returns the actual size of the icon for the requested \a size, \a
+  mode, and \a state. The result might be smaller than requested, but
+  never larger.
+
+  \sa pixmap(), paint()
+*/
+QSize QIcon::actualSize(const QSize &size, Mode mode, State state) const
+{
+    if (!d)
+        return QSize();
+    return d->engine->actualSize(size, mode, state);
+}
+
+
+/*!
+    Uses the \a painter to paint the icon with specified \a alignment,
+    required \a mode, and \a state into the rectangle \a rect.
+
+    \sa actualSize(), pixmap()
+*/
+void QIcon::paint(QPainter *painter, const QRect &rect, Qt::Alignment alignment, Mode mode, State state) const
+{
+    if (!d || !painter)
+        return;
+
+    // Copy of QStyle::alignedRect
+    const QSize size = d->engine->actualSize(rect.size(), mode, state);
+    alignment = QGuiApplicationPrivate::visualAlignment(painter->layoutDirection(), alignment);
+    int x = rect.x();
+    int y = rect.y();
+    int w = size.width();
+    int h = size.height();
+    if ((alignment & Qt::AlignVCenter) == Qt::AlignVCenter)
+        y += rect.size().height()/2 - h/2;
+    else if ((alignment & Qt::AlignBottom) == Qt::AlignBottom)
+        y += rect.size().height() - h;
+    if ((alignment & Qt::AlignRight) == Qt::AlignRight)
+        x += rect.size().width() - w;
+    else if ((alignment & Qt::AlignHCenter) == Qt::AlignHCenter)
+        x += rect.size().width()/2 - w/2;
+    QRect alignedRect(x, y, w, h);
+
+    d->engine->paint(painter, alignedRect, mode, state);
+}
+
+/*!
+    \fn void QIcon::paint(QPainter *painter, int x, int y, int w, int h, Qt::Alignment alignment,
+                          Mode mode, State state) const
+
+    \overload
+
+    Paints the icon into the rectangle QRect(\a x, \a y, \a w, \a h).
+*/
+
+/*!
+    Returns true if the icon is empty; otherwise returns false.
+
+    An icon is empty if it has neither a pixmap nor a filename.
+
+    Note: Even a non-null icon might not be able to create valid
+    pixmaps, eg. if the file does not exist or cannot be read.
+*/
+bool QIcon::isNull() const
+{
+    return !d;
+}
+
+/*!\internal
+ */
+bool QIcon::isDetached() const
+{
+    return !d || d->ref.load() == 1;
+}
+
+/*! \internal
+ */
+void QIcon::detach()
+{
+    if (d) {
+        if (d->ref.load() != 1) {
+            QIconPrivate *x = new QIconPrivate;
+            x->engine = d->engine->clone();
+            if (!d->ref.deref())
+                delete d;
+            d = x;
+        }
+        ++d->detach_no;
+    }
+}
+
+/*!
+    Adds \a pixmap to the icon, as a specialization for \a mode and
+    \a state.
+
+    Custom icon engines are free to ignore additionally added
+    pixmaps.
+
+    \sa addFile()
+*/
+void QIcon::addPixmap(const QPixmap &pixmap, Mode mode, State state)
+{
+    if (pixmap.isNull())
+        return;
+    if (!d) {
+        d = new QIconPrivate;
+        d->engine = new QPixmapIconEngine;
+    } else {
+        detach();
+    }
+    d->engine->addPixmap(pixmap, mode, state);
+}
+
+
+/*!  Adds an image from the file with the given \a fileName to the
+     icon, as a specialization for \a size, \a mode and \a state. The
+     file will be loaded on demand. Note: custom icon engines are free
+     to ignore additionally added pixmaps.
+
+     If \a fileName contains a relative path (e.g. the filename only)
+     the relevant file must be found relative to the runtime working
+     directory.
+
+    The file name can be either refer to an actual file on disk or to
+    one of the application's embedded resources. See the
+    \l{resources.html}{Resource System} overview for details on how to
+    embed images and other resource files in the application's
+    executable.
+
+    Use the QImageReader::supportedImageFormats() and
+    QImageWriter::supportedImageFormats() functions to retrieve a
+    complete list of the supported file formats.
+
+    Note: When you add a non-empty filename to a QIcon, the icon becomes
+    non-null, even if the file doesn't exist or points to a corrupt file.
+
+    \sa addPixmap()
+ */
+void QIcon::addFile(const QString &fileName, const QSize &size, Mode mode, State state)
+{
+    if (fileName.isEmpty())
+        return;
+    if (!d) {
+#if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
+        QFileInfo info(fileName);
+        QString suffix = info.suffix();
+        if (!suffix.isEmpty()) {
+            // first try version 2 engines..
+            const int index = loader()->indexOf(suffix);
+            if (index != -1) {
+                if (QIconEngineFactoryInterface *factory = qobject_cast<QIconEngineFactoryInterface*>(loader()->instance(index))) {
+                    if (QIconEngine *engine = factory->create(fileName)) {
+                        d = new QIconPrivate;
+                        d->engine = engine;
+                    }
+                }
+            }
+        }
+#endif
+        // ...then fall back to the default engine
+        if (!d) {
+            d = new QIconPrivate;
+            d->engine = new QPixmapIconEngine;
+        }
+    } else {
+        detach();
+    }
+    d->engine->addFile(fileName, size, mode, state);
+}
+
+/*!
+    \since 4.5
+
+    Returns a list of available icon sizes for the specified \a mode and
+    \a state.
+*/
+QList<QSize> QIcon::availableSizes(Mode mode, State state) const
+{
+    if (!d || !d->engine)
+        return QList<QSize>();
+    return d->engine->availableSizes(mode, state);
+}
+
+/*!
+    \since 4.7
+
+    Returns the name used to create the icon, if available.
+
+    Depending on the way the icon was created, it may have an associated
+    name. This is the case for icons created with fromTheme() or icons
+    using a QIconEngine which supports the QIconEngineV2::IconNameHook.
+
+    \sa fromTheme(), QIconEngine
+*/
+QString QIcon::name() const
+{
+    if (!d || !d->engine)
+        return QString();
+    return d->engine->iconName();
+}
+
+/*!
+    \since 4.6
+
+    Sets the search paths for icon themes to \a paths.
+    \sa themeSearchPaths(), fromTheme(), setThemeName()
+*/
+void QIcon::setThemeSearchPaths(const QStringList &paths)
+{
+    QIconLoader::instance()->setThemeSearchPath(paths);
+}
+
+/*!
+  \since 4.6
+
+  Returns the search paths for icon themes.
+
+  The default value will depend on the platform:
+
+  On X11, the search path will use the XDG_DATA_DIRS environment
+  variable if available.
+
+  By default all platforms will have the resource directory
+  \c{:\icons} as a fallback. You can use "rcc -project" to generate a
+  resource file from your icon theme.
+
+  \sa setThemeSearchPaths(), fromTheme(), setThemeName()
+*/
+QStringList QIcon::themeSearchPaths()
+{
+    return QIconLoader::instance()->themeSearchPaths();
+}
+
+/*!
+    \since 4.6
+
+    Sets the current icon theme to \a name.
+
+    The \a name should correspond to a directory name in the
+    themeSearchPath() containing an index.theme
+    file describing it's contents.
+
+    \sa themeSearchPaths(), themeName()
+*/
+void QIcon::setThemeName(const QString &name)
+{
+    QIconLoader::instance()->setThemeName(name);
+}
+
+/*!
+    \since 4.6
+
+    Returns the name of the current icon theme.
+
+    On X11, the current icon theme depends on your desktop
+    settings. On other platforms it is not set by default.
+
+    \sa setThemeName(), themeSearchPaths(), fromTheme(),
+    hasThemeIcon()
+*/
+QString QIcon::themeName()
+{
+    return QIconLoader::instance()->themeName();
+}
+
+/*!
+    \since 4.6
+
+    Returns the QIcon corresponding to \a name in the current
+    icon theme. If no such icon is found in the current theme
+    \a fallback is returned instead.
+
+    The latest version of the freedesktop icon specification and naming
+    specification can be obtained here:
+
+    \list
+    \li \l{http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html}
+    \li \l{http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html}
+    \endlist
+
+    To fetch an icon from the current icon theme:
+
+    \snippet code/src_gui_image_qicon.cpp 3
+
+    Or if you want to provide a guaranteed fallback for platforms that
+    do not support theme icons, you can use the second argument:
+
+    \snippet code/src_gui_image_qicon.cpp 4
+
+    \note By default, only X11 will support themed icons. In order to
+    use themed icons on Mac and Windows, you will have to bundle a
+    compliant theme in one of your themeSearchPaths() and set the
+    appropriate themeName().
+
+    \sa themeName(), setThemeName(), themeSearchPaths()
+*/
+QIcon QIcon::fromTheme(const QString &name, const QIcon &fallback)
+{
+    QIcon icon;
+
+    if (qtIconCache()->contains(name)) {
+        icon = *qtIconCache()->object(name);
+    } else {
+        QIcon *cachedIcon  = new QIcon(new QIconLoaderEngine(name));
+        qtIconCache()->insert(name, cachedIcon);
+        icon = *cachedIcon;
+    }
+
+    // Note the qapp check is to allow lazy loading of static icons
+    // Supporting fallbacks will not work for this case.
+    if (qApp && icon.availableSizes().isEmpty())
+        return fallback;
+
+    return icon;
+}
+
+/*!
+    \since 4.6
+
+    Returns true if there is an icon available for \a name in the
+    current icon theme, otherwise returns false.
+
+    \sa themeSearchPaths(), fromTheme(), setThemeName()
+*/
+bool QIcon::hasThemeIcon(const QString &name)
+{
+    QIcon icon = fromTheme(name);
+
+    return !icon.isNull();
+}
+
+
+/*****************************************************************************
+  QIcon stream functions
+ *****************************************************************************/
+#if !defined(QT_NO_DATASTREAM)
+/*!
+    \fn QDataStream &operator<<(QDataStream &stream, const QIcon &icon)
+    \relates QIcon
+    \since 4.2
+
+    Writes the given \a icon to the given \a stream as a PNG
+    image. If the icon contains more than one image, all images will
+    be written to the stream. Note that writing the stream to a file
+    will not produce a valid image file.
+*/
+
+QDataStream &operator<<(QDataStream &s, const QIcon &icon)
+{
+    if (s.version() >= QDataStream::Qt_4_3) {
+        if (icon.isNull()) {
+            s << QString();
+        } else {
+            s << icon.d->engine->key();
+            icon.d->engine->write(s);
+        }
+    } else if (s.version() == QDataStream::Qt_4_2) {
+        if (icon.isNull()) {
+            s << 0;
+        } else {
+            QPixmapIconEngine *engine = static_cast<QPixmapIconEngine *>(icon.d->engine);
+            int num_entries = engine->pixmaps.size();
+            s << num_entries;
+            for (int i=0; i < num_entries; ++i) {
+                s << engine->pixmaps.at(i).pixmap;
+                s << engine->pixmaps.at(i).fileName;
+                s << engine->pixmaps.at(i).size;
+                s << (uint) engine->pixmaps.at(i).mode;
+                s << (uint) engine->pixmaps.at(i).state;
+            }
+        }
+    } else {
+        s << QPixmap(icon.pixmap(22,22));
+    }
+    return s;
+}
+
+/*!
+    \fn QDataStream &operator>>(QDataStream &stream, QIcon &icon)
+    \relates QIcon
+    \since 4.2
+
+    Reads an image, or a set of images, from the given \a stream into
+    the given \a icon.
+*/
+
+QDataStream &operator>>(QDataStream &s, QIcon &icon)
+{
+    if (s.version() >= QDataStream::Qt_4_3) {
+        icon = QIcon();
+        QString key;
+        s >> key;
+        if (key == QLatin1String("QPixmapIconEngine")) {
+            icon.d = new QIconPrivate;
+            QIconEngine *engine = new QPixmapIconEngine;
+            icon.d->engine = engine;
+            engine->read(s);
+        } else if (key == QLatin1String("QIconLoaderEngine")) {
+            icon.d = new QIconPrivate;
+            QIconEngine *engine = new QIconLoaderEngine();
+            icon.d->engine = engine;
+            engine->read(s);
+#if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
+        } else {
+            const int index = loader()->indexOf(key);
+            if (index != -1) {
+                if (QIconEngineFactoryInterface *factory = qobject_cast<QIconEngineFactoryInterface*>(loader()->instance(index))) {
+                    if (QIconEngine *engine= factory->create()) {
+                        icon.d = new QIconPrivate;
+                        icon.d->engine = engine;
+                        engine->read(s);
+                    } // factory
+                } // instance
+            } // index
+#endif
+        }
+    } else if (s.version() == QDataStream::Qt_4_2) {
+        icon = QIcon();
+        int num_entries;
+        QPixmap pm;
+        QString fileName;
+        QSize sz;
+        uint mode;
+        uint state;
+
+        s >> num_entries;
+        for (int i=0; i < num_entries; ++i) {
+            s >> pm;
+            s >> fileName;
+            s >> sz;
+            s >> mode;
+            s >> state;
+            if (pm.isNull())
+                icon.addFile(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
+            else
+                icon.addPixmap(pm, QIcon::Mode(mode), QIcon::State(state));
+        }
+    } else {
+        QPixmap pm;
+        s >> pm;
+        icon.addPixmap(pm);
+    }
+    return s;
+}
+
+#endif //QT_NO_DATASTREAM
+
+#ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug dbg, const QIcon &i)
+{
+    dbg.nospace() << "QIcon(" << i.name() << ')';
+    return dbg.space();
+}
+#endif
+
+/*!
+    \fn DataPtr &QIcon::data_ptr()
+    \internal
+*/
+
+/*!
+    \typedef QIcon::DataPtr
+    \internal
+*/
+
+QT_END_NAMESPACE
+#endif //QT_NO_ICON
diff --git a/src/gui/image/qicon.h b/src/gui/image/qicon.h
new file mode 100644
index 0000000000..264b672c8c
--- /dev/null
+++ b/src/gui/image/qicon.h
@@ -0,0 +1,146 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QICON_H
+#define QICON_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qsize.h>
+#include <QtCore/qlist.h>
+#include <QtGui/qpixmap.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+
+class QIconPrivate;
+class QIconEngine;
+
+class Q_GUI_EXPORT QIcon
+{
+public:
+    enum Mode { Normal, Disabled, Active, Selected };
+    enum State { On, Off };
+
+    QIcon();
+    QIcon(const QPixmap &pixmap);
+    QIcon(const QIcon &other);
+    explicit QIcon(const QString &fileName); // file or resource name
+    explicit QIcon(QIconEngine *engine);
+    ~QIcon();
+    QIcon &operator=(const QIcon &other);
+#ifdef Q_COMPILER_RVALUE_REFS
+    inline QIcon &operator=(QIcon &&other)
+    { qSwap(d, other.d); return *this; }
+#endif
+    inline void swap(QIcon &other) { qSwap(d, other.d); }
+
+    operator QVariant() const;
+
+    QPixmap pixmap(const QSize &size, Mode mode = Normal, State state = Off) const;
+    inline QPixmap pixmap(int w, int h, Mode mode = Normal, State state = Off) const
+        { return pixmap(QSize(w, h), mode, state); }
+    inline QPixmap pixmap(int extent, Mode mode = Normal, State state = Off) const
+        { return pixmap(QSize(extent, extent), mode, state); }
+
+    QSize actualSize(const QSize &size, Mode mode = Normal, State state = Off) const;
+
+    QString name() const;
+
+    void paint(QPainter *painter, const QRect &rect, Qt::Alignment alignment = Qt::AlignCenter, Mode mode = Normal, State state = Off) const;
+    inline void paint(QPainter *painter, int x, int y, int w, int h, Qt::Alignment alignment = Qt::AlignCenter, Mode mode = Normal, State state = Off) const
+        { paint(painter, QRect(x, y, w, h), alignment, mode, state); }
+
+    bool isNull() const;
+    bool isDetached() const;
+    void detach();
+
+#if QT_DEPRECATED_SINCE(5, 0)
+    QT_DEPRECATED inline int serialNumber() const { return cacheKey() >> 32; }
+#endif
+    qint64 cacheKey() const;
+
+    void addPixmap(const QPixmap &pixmap, Mode mode = Normal, State state = Off);
+    void addFile(const QString &fileName, const QSize &size = QSize(), Mode mode = Normal, State state = Off);
+
+    QList<QSize> availableSizes(Mode mode = Normal, State state = Off) const;
+
+    static QIcon fromTheme(const QString &name, const QIcon &fallback = QIcon());
+    static bool hasThemeIcon(const QString &name);
+
+    static QStringList themeSearchPaths();
+    static void setThemeSearchPaths(const QStringList &searchpath);
+
+    static QString themeName();
+    static void setThemeName(const QString &path);
+
+    Q_DUMMY_COMPARISON_OPERATOR(QIcon)
+
+private:
+    QIconPrivate *d;
+#if !defined(QT_NO_DATASTREAM)
+    friend Q_GUI_EXPORT QDataStream &operator<<(QDataStream &, const QIcon &);
+    friend Q_GUI_EXPORT QDataStream &operator>>(QDataStream &, QIcon &);
+#endif
+
+public:
+    typedef QIconPrivate * DataPtr;
+    inline DataPtr &data_ptr() { return d; }
+};
+
+Q_DECLARE_SHARED(QIcon)
+Q_DECLARE_TYPEINFO(QIcon, Q_MOVABLE_TYPE);
+
+#if !defined(QT_NO_DATASTREAM)
+Q_GUI_EXPORT QDataStream &operator<<(QDataStream &, const QIcon &);
+Q_GUI_EXPORT QDataStream &operator>>(QDataStream &, QIcon &);
+#endif
+
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug dbg, const QIcon &);
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QICON_H
diff --git a/src/gui/image/qicon_p.h b/src/gui/image/qicon_p.h
new file mode 100644
index 0000000000..b8b1f001fe
--- /dev/null
+++ b/src/gui/image/qicon_p.h
@@ -0,0 +1,128 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QICON_P_H
+#define QICON_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qsize.h>
+#include <QtCore/qlist.h>
+#include <QtGui/qpixmap.h>
+#include <QtGui/qicon.h>
+#include <QtGui/qiconengine.h>
+
+#ifndef QT_NO_ICON
+QT_BEGIN_NAMESPACE
+
+class QIconPrivate
+{
+public:
+    QIconPrivate();
+
+    ~QIconPrivate() {
+        delete engine;
+    }
+
+    QIconEngine *engine;
+
+    QAtomicInt ref;
+    int serialNum;
+    int detach_no;
+};
+
+
+struct QPixmapIconEngineEntry
+{
+    QPixmapIconEngineEntry():mode(QIcon::Normal), state(QIcon::Off){}
+    QPixmapIconEngineEntry(const QPixmap &pm, QIcon::Mode m = QIcon::Normal, QIcon::State s = QIcon::Off)
+        :pixmap(pm), size(pm.size()), mode(m), state(s){}
+    QPixmapIconEngineEntry(const QString &file, const QSize &sz = QSize(), QIcon::Mode m = QIcon::Normal, QIcon::State s = QIcon::Off)
+        :fileName(file), size(sz), mode(m), state(s){}
+    QPixmap pixmap;
+    QString fileName;
+    QSize size;
+    QIcon::Mode mode;
+    QIcon::State state;
+    bool isNull() const {return (fileName.isEmpty() && pixmap.isNull()); }
+};
+
+
+
+class QPixmapIconEngine : public QIconEngine {
+public:
+    QPixmapIconEngine();
+    QPixmapIconEngine(const QPixmapIconEngine &);
+    ~QPixmapIconEngine();
+    void paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state);
+    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    QPixmapIconEngineEntry *bestMatch(const QSize &size, QIcon::Mode mode, QIcon::State state, bool sizeOnly);
+    QSize actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    void addPixmap(const QPixmap &pixmap, QIcon::Mode mode, QIcon::State state);
+    void addFile(const QString &fileName, const QSize &size, QIcon::Mode mode, QIcon::State state);
+
+    QString key() const;
+    QIconEngine *clone() const;
+    bool read(QDataStream &in);
+    bool write(QDataStream &out) const;
+    void virtual_hook(int id, void *data);
+
+private:
+    QPixmapIconEngineEntry *tryMatch(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    QVector<QPixmapIconEngineEntry> pixmaps;
+
+    friend QDataStream &operator<<(QDataStream &s, const QIcon &icon);
+    friend class QIconThemeEngine;
+};
+
+QT_END_NAMESPACE
+#endif //QT_NO_ICON
+#endif // QICON_P_H
diff --git a/src/gui/image/qiconengine.cpp b/src/gui/image/qiconengine.cpp
new file mode 100644
index 0000000000..2b7fdb9bdc
--- /dev/null
+++ b/src/gui/image/qiconengine.cpp
@@ -0,0 +1,287 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qiconengine.h"
+#include "qpainter.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+  \class QIconEngine
+
+  \brief The QIconEngine class provides an abstract base class for QIcon renderers.
+
+  \ingroup painting
+  \inmodule QtGui
+
+  An icon engine provides the rendering functions for a QIcon. Each icon has a
+  corresponding icon engine that is responsible for drawing the icon with a
+  requested size, mode and state.
+
+  The icon is rendered by the paint() function, and the icon can additionally be
+  obtained as a pixmap with the pixmap() function (the default implementation
+  simply uses paint() to achieve this). The addPixmap() function can be used to
+  add new pixmaps to the icon engine, and is used by QIcon to add specialized
+  custom pixmaps.
+
+  The paint(), pixmap(), and addPixmap() functions are all virtual, and can
+  therefore be reimplemented in subclasses of QIconEngine.
+
+  \sa QIconEnginePlugin
+
+*/
+
+/*!
+  \fn virtual void QIconEngine::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state) = 0;
+
+  Uses the given \a painter to paint the icon with the required \a mode and
+  \a state into the rectangle \a rect.
+*/
+
+/*!  Returns the actual size of the icon the engine provides for the
+  requested \a size, \a mode and \a state. The default implementation
+  returns the given \a size.
+ */
+QSize QIconEngine::actualSize(const QSize &size, QIcon::Mode /*mode*/, QIcon::State /*state*/)
+{
+    return size;
+}
+
+
+/*!
+  Destroys the icon engine.
+ */
+QIconEngine::~QIconEngine()
+{
+}
+
+
+/*!
+  Returns the icon as a pixmap with the required \a size, \a mode,
+  and \a state. The default implementation creates a new pixmap and
+  calls paint() to fill it.
+*/
+QPixmap QIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+    QPixmap pm(size);
+    {
+        QPainter p(&pm);
+        paint(&p, QRect(QPoint(0,0),size), mode, state);
+    }
+    return pm;
+}
+
+/*!
+  Called by QIcon::addPixmap(). Adds a specialized \a pixmap for the given
+  \a mode and \a state. The default pixmap-based engine stores any supplied
+  pixmaps, and it uses them instead of scaled pixmaps if the size of a pixmap
+  matches the size of icon requested. Custom icon engines that implement
+  scalable vector formats are free to ignores any extra pixmaps.
+ */
+void QIconEngine::addPixmap(const QPixmap &/*pixmap*/, QIcon::Mode /*mode*/, QIcon::State /*state*/)
+{
+}
+
+
+/*!  Called by QIcon::addFile(). Adds a specialized pixmap from the
+  file with the given \a fileName, \a size, \a mode and \a state. The
+  default pixmap-based engine stores any supplied file names, and it
+  loads the pixmaps on demand instead of using scaled pixmaps if the
+  size of a pixmap matches the size of icon requested. Custom icon
+  engines that implement scalable vector formats are free to ignores
+  any extra files.
+ */
+void QIconEngine::addFile(const QString &/*fileName*/, const QSize &/*size*/, QIcon::Mode /*mode*/, QIcon::State /*state*/)
+{
+}
+
+
+/*!
+    \enum QIconEngine::IconEngineHook
+    \since 4.5
+
+    These enum values are used for virtual_hook() to allow additional
+    queries to icon engine without breaking binary compatibility.
+
+    \value AvailableSizesHook Allows to query the sizes of the
+    contained pixmaps for pixmap-based engines. The \a data argument
+    of the virtual_hook() function is a AvailableSizesArgument pointer
+    that should be filled with icon sizes. Engines that work in terms
+    of a scalable, vectorial format normally return an empty list.
+
+    \value IconNameHook Allows to query the name used to create the
+    icon, for example when instantiating an icon using
+    QIcon::fromTheme().
+
+    \sa virtual_hook()
+ */
+
+/*!
+    \class QIconEngine::AvailableSizesArgument
+    \since 4.5
+
+    \inmodule QtGui
+
+    This struct represents arguments to virtual_hook() function when
+    \a id parameter is QIconEngine::AvailableSizesHook.
+
+    \sa virtual_hook(), QIconEngine::IconEngineHook
+ */
+
+/*!
+    \variable QIconEngine::AvailableSizesArgument::mode
+    \brief the requested mode of an image.
+
+    \sa QIcon::Mode
+*/
+
+/*!
+    \variable QIconEngine::AvailableSizesArgument::state
+    \brief the requested state of an image.
+
+    \sa QIcon::State
+*/
+
+/*!
+    \variable QIconEngine::AvailableSizesArgument::sizes
+
+    \brief image sizes that are available with specified \a mode and
+    \a state. This is an output parameter and is filled after call to
+    virtual_hook(). Engines that work in terms of a scalable,
+    vectorial format normally return an empty list.
+*/
+
+
+/*!
+    Returns a key that identifies this icon engine.
+ */
+QString QIconEngine::key() const
+{
+    return QString();
+}
+
+/*! \fn QIconEngine *QIconEngine::clone() const
+
+    Reimplement this method to return a clone of this icon engine.
+ */
+
+/*!
+    Reads icon engine contents from the QDataStream \a in. Returns
+    true if the contents were read; otherwise returns false.
+
+    QIconEngine's default implementation always return false.
+ */
+bool QIconEngine::read(QDataStream &)
+{
+    return false;
+}
+
+/*!
+    Writes the contents of this engine to the QDataStream \a out.
+    Returns true if the contents were written; otherwise returns false.
+
+    QIconEngine's default implementation always return false.
+ */
+bool QIconEngine::write(QDataStream &) const
+{
+    return false;
+}
+
+/*!
+    \since 4.5
+
+    Additional method to allow extending QIconEngine without
+    adding new virtual methods (and without breaking binary compatibility).
+    The actual action and format of \a data depends on \a id argument
+    which is in fact a constant from IconEngineHook enum.
+
+    \sa IconEngineHook
+*/
+void QIconEngine::virtual_hook(int id, void *data)
+{
+    switch (id) {
+    case QIconEngine::AvailableSizesHook: {
+        QIconEngine::AvailableSizesArgument &arg =
+            *reinterpret_cast<QIconEngine::AvailableSizesArgument*>(data);
+        arg.sizes.clear();
+        break;
+    }
+    default:
+        break;
+    }
+}
+
+/*!
+    \since 4.5
+
+    Returns sizes of all images that are contained in the engine for the
+    specific \a mode and \a state.
+
+    \note This is a helper method and the actual work is done by
+    virtual_hook() method, hence this method depends on icon engine support
+    and may not work with all icon engines.
+ */
+QList<QSize> QIconEngine::availableSizes(QIcon::Mode mode, QIcon::State state) const
+{
+    AvailableSizesArgument arg;
+    arg.mode = mode;
+    arg.state = state;
+    const_cast<QIconEngine *>(this)->virtual_hook(QIconEngine::AvailableSizesHook, reinterpret_cast<void*>(&arg));
+    return arg.sizes;
+}
+
+/*!
+    \since 4.7
+
+    Returns the name used to create the engine, if available.
+
+    \note This is a helper method and the actual work is done by
+    virtual_hook() method, hence this method depends on icon engine support
+    and may not work with all icon engines.
+ */
+QString QIconEngine::iconName() const
+{
+    QString name;
+    const_cast<QIconEngine *>(this)->virtual_hook(QIconEngine::IconNameHook, reinterpret_cast<void*>(&name));
+    return name;
+}
+
+QT_END_NAMESPACE
diff --git a/src/gui/image/qiconengine.h b/src/gui/image/qiconengine.h
new file mode 100644
index 0000000000..e47f86713a
--- /dev/null
+++ b/src/gui/image/qiconengine.h
@@ -0,0 +1,95 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QICONENGINE_H
+#define QICONENGINE_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qlist.h>
+#include <QtGui/qicon.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+
+class Q_GUI_EXPORT QIconEngine
+{
+public:
+    virtual ~QIconEngine();
+    virtual void paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state) = 0;
+    virtual QSize actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    virtual QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state);
+
+    virtual void addPixmap(const QPixmap &pixmap, QIcon::Mode mode, QIcon::State state);
+    virtual void addFile(const QString &fileName, const QSize &size, QIcon::Mode mode, QIcon::State state);
+
+    virtual QString key() const;
+    virtual QIconEngine *clone() const = 0;
+    virtual bool read(QDataStream &in);
+    virtual bool write(QDataStream &out) const;
+
+    enum IconEngineHook { AvailableSizesHook = 1, IconNameHook };
+
+    struct AvailableSizesArgument
+    {
+        QIcon::Mode mode;
+        QIcon::State state;
+        QList<QSize> sizes;
+    };
+
+    virtual QList<QSize> availableSizes(QIcon::Mode mode = QIcon::Normal,
+                                    QIcon::State state = QIcon::Off) const;
+
+    virtual QString iconName() const;
+
+    virtual void virtual_hook(int id, void *data);
+};
+
+#if QT_DEPRECATED_SINCE(5, 0)
+typedef QIconEngine QIconEngineV2;
+#endif
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QICONENGINE_H
diff --git a/src/gui/image/qiconengineplugin.cpp b/src/gui/image/qiconengineplugin.cpp
new file mode 100644
index 0000000000..29953a468e
--- /dev/null
+++ b/src/gui/image/qiconengineplugin.cpp
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qiconengineplugin.h"
+#include "qiconengine.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QIconEnginePlugin
+    \brief The QIconEnginePlugin class provides an abstract base for custom QIconEngine plugins.
+
+    \ingroup plugins
+    \inmodule QtGui
+
+    \b {Use QIconEnginePluginV2 instead.}
+
+    The icon engine plugin is a simple plugin interface that makes it easy to
+    create custom icon engines that can be loaded dynamically into applications
+    through QIcon. QIcon uses the file or resource name's suffix to determine
+    what icon engine to use.
+
+    Writing a icon engine plugin is achieved by subclassing this base class,
+    reimplementing the pure virtual functions keys() and create(), and
+    exporting the class with the Q_EXPORT_PLUGIN2() macro.
+
+    \sa {How to Create Qt Plugins}
+*/
+
+/*!
+    \fn QStringList QIconEnginePlugin::keys() const
+
+    Returns a list of icon engine keys that this plugin supports. The keys correspond
+    to the suffix of the file or resource name used when the plugin was created.
+    Keys are case insensitive.
+
+    \sa create()
+*/
+
+/*!
+    \fn QIconEngine* QIconEnginePlugin::create(const QString& filename)
+
+    Creates and returns a QIconEngine object for the icon with the given
+    \a filename.
+
+    \sa keys()
+*/
+
+/*!
+    Constructs a icon engine plugin with the given \a parent. This is invoked
+    automatically by the Q_EXPORT_PLUGIN2() macro.
+*/
+QIconEnginePlugin::QIconEnginePlugin(QObject *parent)
+    : QObject(parent)
+{
+}
+
+/*!
+    Destroys the icon engine plugin.
+
+    You never have to call this explicitly. Qt destroys a plugin
+    automatically when it is no longer used.
+*/
+QIconEnginePlugin::~QIconEnginePlugin()
+{
+}
+
+
+QT_END_NAMESPACE
diff --git a/src/gui/image/qiconengineplugin.h b/src/gui/image/qiconengineplugin.h
new file mode 100644
index 0000000000..9333400609
--- /dev/null
+++ b/src/gui/image/qiconengineplugin.h
@@ -0,0 +1,80 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QICONENGINEPLUGIN_H
+#define QICONENGINEPLUGIN_H
+
+#include <QtCore/qplugin.h>
+#include <QtCore/qfactoryinterface.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+
+class QIconEngine;
+
+struct Q_GUI_EXPORT QIconEngineFactoryInterface : public QFactoryInterface
+{
+    virtual QIconEngine *create(const QString &filename = QString()) = 0;
+};
+
+#define QIconEngineFactoryInterface_iid \
+    "org.qt-project.Qt.QIconEngineFactoryInterface"
+Q_DECLARE_INTERFACE(QIconEngineFactoryInterface, QIconEngineFactoryInterface_iid)
+
+class Q_GUI_EXPORT QIconEnginePlugin : public QObject, public QIconEngineFactoryInterface
+{
+    Q_OBJECT
+    Q_INTERFACES(QIconEngineFactoryInterface:QFactoryInterface)
+public:
+    QIconEnginePlugin(QObject *parent = 0);
+    ~QIconEnginePlugin();
+
+    virtual QStringList keys() const = 0;
+    virtual QIconEngine *create(const QString &filename = QString()) = 0;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QICONENGINEPLUGIN_H
diff --git a/src/gui/image/qiconloader.cpp b/src/gui/image/qiconloader.cpp
new file mode 100644
index 0000000000..71b286b2ff
--- /dev/null
+++ b/src/gui/image/qiconloader.cpp
@@ -0,0 +1,584 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QT_NO_ICON
+#include <private/qiconloader_p.h>
+
+#include <private/qguiapplication_p.h>
+#include <private/qicon_p.h>
+
+#include <QtGui/QIconEnginePlugin>
+#include <QtGui/QPixmapCache>
+#include <qpa/qplatformtheme.h>
+#include <QtGui/QIconEngine>
+#include <QtGui/QPalette>
+#include <QtCore/QList>
+#include <QtCore/QHash>
+#include <QtCore/QDir>
+#include <QtCore/QSettings>
+#include <QtGui/QPainter>
+
+#ifdef Q_WS_MAC
+#include <private/qt_cocoa_helpers_mac_p.h>
+#endif
+
+#include <private/qhexstring_p.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_GLOBAL_STATIC(QIconLoader, iconLoaderInstance)
+
+/* Theme to use in last resort, if the theme does not have the icon, neither the parents  */
+static QString fallbackTheme()
+{
+    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
+        const QVariant themeHint = theme->themeHint(QPlatformTheme::SystemIconThemeName);
+        if (themeHint.isValid())
+            return themeHint.toString();
+    }
+    return QString();
+}
+
+QIconLoader::QIconLoader() :
+        m_themeKey(1), m_supportsSvg(false), m_initialized(false)
+{
+}
+
+// We lazily initialize the loader to make static icons
+// work. Though we do not officially support this.
+
+static inline QString systemThemeName()
+{
+    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
+        const QVariant themeHint = theme->themeHint(QPlatformTheme::SystemIconThemeName);
+        if (themeHint.isValid())
+            return themeHint.toString();
+    }
+    return QString();
+}
+
+static inline QStringList systemIconSearchPaths()
+{
+    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
+        const QVariant themeHint = theme->themeHint(QPlatformTheme::IconThemeSearchPaths);
+        if (themeHint.isValid())
+            return themeHint.toStringList();
+    }
+    return QStringList();
+}
+
+void QIconLoader::ensureInitialized()
+{
+    if (!m_initialized) {
+        m_initialized = true;
+
+        Q_ASSERT(qApp);
+
+        m_systemTheme = systemThemeName();
+
+        if (m_systemTheme.isEmpty())
+            m_systemTheme = fallbackTheme();
+#ifndef QT_NO_LIBRARY
+        QFactoryLoader iconFactoryLoader(QIconEngineFactoryInterface_iid,
+                                         QLatin1String("/iconengines"),
+                                         Qt::CaseInsensitive);
+        if (iconFactoryLoader.keyMap().key(QLatin1String("svg"), -1) != -1)
+            m_supportsSvg = true;
+#endif //QT_NO_LIBRARY
+    }
+}
+
+QIconLoader *QIconLoader::instance()
+{
+   return iconLoaderInstance();
+}
+
+// Queries the system theme and invalidates existing
+// icons if the theme has changed.
+void QIconLoader::updateSystemTheme()
+{
+    // Only change if this is not explicitly set by the user
+    if (m_userTheme.isEmpty()) {
+        QString theme = systemThemeName();
+        if (theme.isEmpty())
+            theme = fallbackTheme();
+        if (theme != m_systemTheme) {
+            m_systemTheme = theme;
+            invalidateKey();
+        }
+    }
+}
+
+void QIconLoader::setThemeName(const QString &themeName)
+{
+    m_userTheme = themeName;
+    invalidateKey();
+}
+
+void QIconLoader::setThemeSearchPath(const QStringList &searchPaths)
+{
+    m_iconDirs = searchPaths;
+    themeList.clear();
+    invalidateKey();
+}
+
+QStringList QIconLoader::themeSearchPaths() const
+{
+    if (m_iconDirs.isEmpty()) {
+        m_iconDirs = systemIconSearchPaths();
+        // Always add resource directory as search path
+        m_iconDirs.append(QLatin1String(":/icons"));
+    }
+    return m_iconDirs;
+}
+
+QIconTheme::QIconTheme(const QString &themeName)
+        : m_valid(false)
+{
+    QFile themeIndex;
+
+    QList <QIconDirInfo> keyList;
+    QStringList iconDirs = QIcon::themeSearchPaths();
+    for ( int i = 0 ; i < iconDirs.size() ; ++i) {
+        QDir iconDir(iconDirs[i]);
+        QString themeDir = iconDir.path() + QLatin1Char('/') + themeName;
+        themeIndex.setFileName(themeDir + QLatin1String("/index.theme"));
+        if (themeIndex.exists()) {
+            m_contentDir = themeDir;
+            m_valid = true;
+            break;
+        }
+    }
+#ifndef QT_NO_SETTINGS
+    if (themeIndex.exists()) {
+        const QSettings indexReader(themeIndex.fileName(), QSettings::IniFormat);
+        QStringListIterator keyIterator(indexReader.allKeys());
+        while (keyIterator.hasNext()) {
+
+            const QString key = keyIterator.next();
+            if (key.endsWith(QLatin1String("/Size"))) {
+                // Note the QSettings ini-format does not accept
+                // slashes in key names, hence we have to cheat
+                if (int size = indexReader.value(key).toInt()) {
+                    QString directoryKey = key.left(key.size() - 5);
+                    QIconDirInfo dirInfo(directoryKey);
+                    dirInfo.size = size;
+                    QString type = indexReader.value(directoryKey +
+                                                     QLatin1String("/Type")
+                                                     ).toString();
+
+                    if (type == QLatin1String("Fixed"))
+                        dirInfo.type = QIconDirInfo::Fixed;
+                    else if (type == QLatin1String("Scalable"))
+                        dirInfo.type = QIconDirInfo::Scalable;
+                    else
+                        dirInfo.type = QIconDirInfo::Threshold;
+
+                    dirInfo.threshold = indexReader.value(directoryKey +
+                                                        QLatin1String("/Threshold"),
+                                                        2).toInt();
+
+                    dirInfo.minSize = indexReader.value(directoryKey +
+                                                         QLatin1String("/MinSize"),
+                                                         size).toInt();
+
+                    dirInfo.maxSize = indexReader.value(directoryKey +
+                                                        QLatin1String("/MaxSize"),
+                                                        size).toInt();
+                    m_keyList.append(dirInfo);
+                }
+            }
+        }
+
+        // Parent themes provide fallbacks for missing icons
+        m_parents = indexReader.value(
+                QLatin1String("Icon Theme/Inherits")).toStringList();
+
+        // Ensure a default platform fallback for all themes
+        if (m_parents.isEmpty()) {
+            const QString fallback = fallbackTheme();
+            if (!fallback.isEmpty())
+                m_parents.append(fallback);
+        }
+
+        // Ensure that all themes fall back to hicolor
+        if (!m_parents.contains(QLatin1String("hicolor")))
+            m_parents.append(QLatin1String("hicolor"));
+    }
+#endif //QT_NO_SETTINGS
+}
+
+QThemeIconEntries QIconLoader::findIconHelper(const QString &themeName,
+                                 const QString &iconName,
+                                 QStringList &visited) const
+{
+    QThemeIconEntries entries;
+    Q_ASSERT(!themeName.isEmpty());
+
+    QPixmap pixmap;
+
+    // Used to protect against potential recursions
+    visited << themeName;
+
+    QIconTheme theme = themeList.value(themeName);
+    if (!theme.isValid()) {
+        theme = QIconTheme(themeName);
+        if (!theme.isValid())
+            theme = QIconTheme(fallbackTheme());
+
+        themeList.insert(themeName, theme);
+    }
+
+    QString contentDir = theme.contentDir() + QLatin1Char('/');
+    QList<QIconDirInfo> subDirs = theme.keyList();
+
+    const QString svgext(QLatin1String(".svg"));
+    const QString pngext(QLatin1String(".png"));
+
+    // Add all relevant files
+    for (int i = 0; i < subDirs.size() ; ++i) {
+        const QIconDirInfo &dirInfo = subDirs.at(i);
+        QString subdir = dirInfo.path;
+        QDir currentDir(contentDir + subdir);
+        if (currentDir.exists(iconName + pngext)) {
+            PixmapEntry *iconEntry = new PixmapEntry;
+            iconEntry->dir = dirInfo;
+            iconEntry->filename = currentDir.filePath(iconName + pngext);
+            // Notice we ensure that pixmap entries always come before
+            // scalable to preserve search order afterwards
+            entries.prepend(iconEntry);
+        } else if (m_supportsSvg &&
+            currentDir.exists(iconName + svgext)) {
+            ScalableEntry *iconEntry = new ScalableEntry;
+            iconEntry->dir = dirInfo;
+            iconEntry->filename = currentDir.filePath(iconName + svgext);
+            entries.append(iconEntry);
+        }
+    }
+
+    if (entries.isEmpty()) {
+        const QStringList parents = theme.parents();
+        // Search recursively through inherited themes
+        for (int i = 0 ; i < parents.size() ; ++i) {
+
+            const QString parentTheme = parents.at(i).trimmed();
+
+            if (!visited.contains(parentTheme)) // guard against recursion
+                entries = findIconHelper(parentTheme, iconName, visited);
+
+            if (!entries.isEmpty()) // success
+                break;
+        }
+    }
+    return entries;
+}
+
+QThemeIconEntries QIconLoader::loadIcon(const QString &name) const
+{
+    if (!themeName().isEmpty()) {
+        QStringList visited;
+        return findIconHelper(themeName(), name, visited);
+    }
+
+    return QThemeIconEntries();
+}
+
+
+// -------- Icon Loader Engine -------- //
+
+
+QIconLoaderEngine::QIconLoaderEngine(const QString& iconName)
+        : m_iconName(iconName), m_key(0)
+{
+}
+
+QIconLoaderEngine::~QIconLoaderEngine()
+{
+    while (!m_entries.isEmpty())
+        delete m_entries.takeLast();
+    Q_ASSERT(m_entries.size() == 0);
+}
+
+QIconLoaderEngine::QIconLoaderEngine(const QIconLoaderEngine &other)
+        : QIconEngine(other),
+        m_iconName(other.m_iconName),
+        m_key(0)
+{
+}
+
+QIconEngine *QIconLoaderEngine::clone() const
+{
+    return new QIconLoaderEngine(*this);
+}
+
+bool QIconLoaderEngine::read(QDataStream &in) {
+    in >> m_iconName;
+    return true;
+}
+
+bool QIconLoaderEngine::write(QDataStream &out) const
+{
+    out << m_iconName;
+    return true;
+}
+
+bool QIconLoaderEngine::hasIcon() const
+{
+    return !(m_entries.isEmpty());
+}
+
+// Lazily load the icon
+void QIconLoaderEngine::ensureLoaded()
+{
+
+    iconLoaderInstance()->ensureInitialized();
+
+    if (!(iconLoaderInstance()->themeKey() == m_key)) {
+
+        while (!m_entries.isEmpty())
+            delete m_entries.takeLast();
+
+        Q_ASSERT(m_entries.size() == 0);
+        m_entries = iconLoaderInstance()->loadIcon(m_iconName);
+        m_key = iconLoaderInstance()->themeKey();
+    }
+}
+
+void QIconLoaderEngine::paint(QPainter *painter, const QRect &rect,
+                             QIcon::Mode mode, QIcon::State state)
+{
+    QSize pixmapSize = rect.size();
+#if defined(Q_WS_MAC)
+    pixmapSize *= qt_mac_get_scalefactor();
+#endif
+    painter->drawPixmap(rect, pixmap(pixmapSize, mode, state));
+}
+
+/*
+ * This algorithm is defined by the freedesktop spec:
+ * http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html
+ */
+static bool directoryMatchesSize(const QIconDirInfo &dir, int iconsize)
+{
+    if (dir.type == QIconDirInfo::Fixed) {
+        return dir.size == iconsize;
+
+    } else if (dir.type == QIconDirInfo::Scalable) {
+        return dir.size <= dir.maxSize &&
+                iconsize >= dir.minSize;
+
+    } else if (dir.type == QIconDirInfo::Threshold) {
+        return iconsize >= dir.size - dir.threshold &&
+                iconsize <= dir.size + dir.threshold;
+    }
+
+    Q_ASSERT(1); // Not a valid value
+    return false;
+}
+
+/*
+ * This algorithm is defined by the freedesktop spec:
+ * http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html
+ */
+static int directorySizeDistance(const QIconDirInfo &dir, int iconsize)
+{
+    if (dir.type == QIconDirInfo::Fixed) {
+        return qAbs(dir.size - iconsize);
+
+    } else if (dir.type == QIconDirInfo::Scalable) {
+        if (iconsize < dir.minSize)
+            return dir.minSize - iconsize;
+        else if (iconsize > dir.maxSize)
+            return iconsize - dir.maxSize;
+        else
+            return 0;
+
+    } else if (dir.type == QIconDirInfo::Threshold) {
+        if (iconsize < dir.size - dir.threshold)
+            return dir.minSize - iconsize;
+        else if (iconsize > dir.size + dir.threshold)
+            return iconsize - dir.maxSize;
+        else return 0;
+    }
+
+    Q_ASSERT(1); // Not a valid value
+    return INT_MAX;
+}
+
+QIconLoaderEngineEntry *QIconLoaderEngine::entryForSize(const QSize &size)
+{
+    int iconsize = qMin(size.width(), size.height());
+
+    // Note that m_entries are sorted so that png-files
+    // come first
+
+    // Search for exact matches first
+    for (int i = 0; i < m_entries.count(); ++i) {
+        QIconLoaderEngineEntry *entry = m_entries.at(i);
+        if (directoryMatchesSize(entry->dir, iconsize)) {
+            return entry;
+        }
+    }
+
+    // Find the minimum distance icon
+    int minimalSize = INT_MAX;
+    QIconLoaderEngineEntry *closestMatch = 0;
+    for (int i = 0; i < m_entries.count(); ++i) {
+        QIconLoaderEngineEntry *entry = m_entries.at(i);
+        int distance = directorySizeDistance(entry->dir, iconsize);
+        if (distance < minimalSize) {
+            minimalSize  = distance;
+            closestMatch = entry;
+        }
+    }
+    return closestMatch;
+}
+
+/*
+ * Returns the actual icon size. For scalable svg's this is equivalent
+ * to the requested size. Otherwise the closest match is returned but
+ * we can never return a bigger size than the requested size.
+ *
+ */
+QSize QIconLoaderEngine::actualSize(const QSize &size, QIcon::Mode mode,
+                                   QIcon::State state)
+{
+    ensureLoaded();
+
+    QIconLoaderEngineEntry *entry = entryForSize(size);
+    if (entry) {
+        const QIconDirInfo &dir = entry->dir;
+        if (dir.type == QIconDirInfo::Scalable)
+            return size;
+        else {
+            int result = qMin<int>(dir.size, qMin(size.width(), size.height()));
+            return QSize(result, result);
+        }
+    }
+    return QIconEngine::actualSize(size, mode, state);
+}
+
+QPixmap PixmapEntry::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+    Q_UNUSED(state);
+
+    // Ensure that basePixmap is lazily initialized before generating the
+    // key, otherwise the cache key is not unique
+    if (basePixmap.isNull())
+        basePixmap.load(filename);
+
+    int actualSize = qMin(size.width(), size.height());
+    QString key = QLatin1String("$qt_theme_")
+                  % HexString<qint64>(basePixmap.cacheKey())
+                  % HexString<int>(mode)
+                  % HexString<qint64>(QGuiApplication::palette().cacheKey())
+                  % HexString<int>(actualSize);
+
+    QPixmap cachedPixmap;
+    if (QPixmapCache::find(key, &cachedPixmap)) {
+        return cachedPixmap;
+    } else {
+        cachedPixmap = basePixmap;
+        if (QGuiApplication *guiApp = qobject_cast<QGuiApplication *>(qApp))
+            cachedPixmap = static_cast<QGuiApplicationPrivate*>(QObjectPrivate::get(guiApp))->applyQIconStyleHelper(mode, basePixmap);
+        QPixmapCache::insert(key, cachedPixmap);
+    }
+    return cachedPixmap;
+}
+
+QPixmap ScalableEntry::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
+{
+    if (svgIcon.isNull())
+        svgIcon = QIcon(filename);
+
+    // Simply reuse svg icon engine
+    return svgIcon.pixmap(size, mode, state);
+}
+
+QPixmap QIconLoaderEngine::pixmap(const QSize &size, QIcon::Mode mode,
+                                 QIcon::State state)
+{
+    ensureLoaded();
+
+    QIconLoaderEngineEntry *entry = entryForSize(size);
+    if (entry)
+        return entry->pixmap(size, mode, state);
+
+    return QPixmap();
+}
+
+QString QIconLoaderEngine::key() const
+{
+    return QLatin1String("QIconLoaderEngine");
+}
+
+void QIconLoaderEngine::virtual_hook(int id, void *data)
+{
+    ensureLoaded();
+
+    switch (id) {
+    case QIconEngine::AvailableSizesHook:
+        {
+            QIconEngine::AvailableSizesArgument &arg
+                    = *reinterpret_cast<QIconEngine::AvailableSizesArgument*>(data);
+            const QList<QIconDirInfo> directoryKey = iconLoaderInstance()->theme().keyList();
+            arg.sizes.clear();
+
+            // Gets all sizes from the DirectoryInfo entries
+            for (int i = 0 ; i < m_entries.size() ; ++i) {
+                int size = m_entries.at(i)->dir.size;
+                arg.sizes.append(QSize(size, size));
+            }
+        }
+        break;
+    case QIconEngine::IconNameHook:
+        {
+            QString &name = *reinterpret_cast<QString*>(data);
+            name = m_iconName;
+        }
+        break;
+    default:
+        QIconEngine::virtual_hook(id, data);
+    }
+}
+
+QT_END_NAMESPACE
+
+#endif //QT_NO_ICON
diff --git a/src/gui/image/qiconloader_p.h b/src/gui/image/qiconloader_p.h
new file mode 100644
index 0000000000..bd990d0d53
--- /dev/null
+++ b/src/gui/image/qiconloader_p.h
@@ -0,0 +1,192 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QDESKTOPICON_P_H
+#define QDESKTOPICON_P_H
+
+#ifndef QT_NO_ICON
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/QIcon>
+#include <QtGui/QIconEngine>
+#include <QtGui/QPixmapCache>
+#include <private/qicon_p.h>
+#include <private/qfactoryloader_p.h>
+#include <QtCore/QHash>
+
+QT_BEGIN_NAMESPACE
+
+class QIconLoader;
+
+struct QIconDirInfo
+{
+    enum Type { Fixed, Scalable, Threshold };
+    QIconDirInfo(const QString &_path = QString()) :
+            path(_path),
+            size(0),
+            maxSize(0),
+            minSize(0),
+            threshold(0),
+            type(Threshold) {}
+    QString path;
+    short size;
+    short maxSize;
+    short minSize;
+    short threshold;
+    Type type : 4;
+};
+
+class QIconLoaderEngineEntry
+ {
+public:
+    virtual ~QIconLoaderEngineEntry() {}
+    virtual QPixmap pixmap(const QSize &size,
+                           QIcon::Mode mode,
+                           QIcon::State state) = 0;
+    QString filename;
+    QIconDirInfo dir;
+    static int count;
+};
+
+struct ScalableEntry : public QIconLoaderEngineEntry
+{
+    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    QIcon svgIcon;
+};
+
+struct PixmapEntry : public QIconLoaderEngineEntry
+{
+    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    QPixmap basePixmap;
+};
+
+typedef QList<QIconLoaderEngineEntry*> QThemeIconEntries;
+
+class QIconLoaderEngine : public QIconEngine
+{
+public:
+    QIconLoaderEngine(const QString& iconName = QString());
+    ~QIconLoaderEngine();
+
+    void paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state);
+    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    QSize actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state);
+    QIconEngine *clone() const;
+    bool read(QDataStream &in);
+    bool write(QDataStream &out) const;
+
+private:
+    QString key() const;
+    bool hasIcon() const;
+    void ensureLoaded();
+    void virtual_hook(int id, void *data);
+    QIconLoaderEngineEntry *entryForSize(const QSize &size);
+    QIconLoaderEngine(const QIconLoaderEngine &other);
+    QThemeIconEntries m_entries;
+    QString m_iconName;
+    uint m_key;
+
+    friend class QIconLoader;
+};
+
+class QIconTheme
+{
+public:
+    QIconTheme(const QString &name);
+    QIconTheme() : m_valid(false) {}
+    QStringList parents() { return m_parents; }
+    QList <QIconDirInfo> keyList() { return m_keyList; }
+    QString contentDir() { return m_contentDir; }
+    bool isValid() { return m_valid; }
+
+private:
+    QString m_contentDir;
+    QList <QIconDirInfo> m_keyList;
+    QStringList m_parents;
+    bool m_valid;
+};
+
+class Q_GUI_EXPORT QIconLoader : public QObject
+{
+public:
+    QIconLoader();
+    QThemeIconEntries loadIcon(const QString &iconName) const;
+    uint themeKey() const { return m_themeKey; }
+
+    QString themeName() const { return m_userTheme.isEmpty() ? m_systemTheme : m_userTheme; }
+    void setThemeName(const QString &themeName);
+    QIconTheme theme() { return themeList.value(themeName()); }
+    void setThemeSearchPath(const QStringList &searchPaths);
+    QStringList themeSearchPaths() const;
+    QIconDirInfo dirInfo(int dirindex);
+    static QIconLoader *instance();
+    void updateSystemTheme();
+    void invalidateKey() { m_themeKey++; }
+    void ensureInitialized();
+
+private:
+    QThemeIconEntries findIconHelper(const QString &themeName,
+                                     const QString &iconName,
+                                     QStringList &visited) const;
+    uint m_themeKey;
+    bool m_supportsSvg;
+    bool m_initialized;
+
+    mutable QString m_userTheme;
+    mutable QString m_systemTheme;
+    mutable QStringList m_iconDirs;
+    mutable QHash <QString, QIconTheme> themeList;
+};
+
+QT_END_NAMESPACE
+
+#endif // QDESKTOPICON_P_H
+
+#endif //QT_NO_ICON