Long live Qt 4.5!

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diff --git a/src/gui/painting/qbackingstore_p.h b/src/gui/painting/qbackingstore_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QBACKINGSTORE_P_H
+#define QBACKINGSTORE_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 <QDebug>
+#include <QtGui/qwidget.h>
+#include <private/qwidget_p.h>
+#include <private/qwindowsurface_p.h>
+#ifdef Q_WS_QWS
+#include <private/qwindowsurface_qws_p.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QWindowSurface;
+
+struct BeginPaintInfo {
+    inline BeginPaintInfo() : wasFlushed(0), nothingToPaint(0), windowSurfaceRecreated(0) {}
+    uint wasFlushed : 1;
+    uint nothingToPaint : 1;
+    uint windowSurfaceRecreated : 1;
+};
+
+class Q_AUTOTEST_EXPORT QWidgetBackingStore
+{
+public:
+    QWidgetBackingStore(QWidget *t);
+    ~QWidgetBackingStore();
+
+    static void showYellowThing(QWidget *widget, const QRegion &rgn, int msec, bool);
+
+    void sync(QWidget *exposedWidget, const QRegion &exposedRegion);
+    void sync();
+    void flush(QWidget *widget = 0, QWindowSurface *surface = 0);
+
+    inline QPoint topLevelOffset() const { return tlwOffset; }
+
+    QWindowSurface *surface() const { return windowSurface; }
+
+    inline bool isDirty() const
+    {
+        return !(dirtyWidgets.isEmpty() && dirty.isEmpty() && !hasDirtyFromPreviousSync
+#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER)
+                 && !hasDirtyWindowDecoration()
+#endif
+                );
+    }
+
+private:
+    QWidget *tlw;
+    QRegion dirtyOnScreen; // needsFlush
+    QRegion dirty; // needsRepaint
+    QRegion dirtyFromPreviousSync;
+    QVector<QWidget *> dirtyWidgets;
+    QVector<QWidget *> *dirtyOnScreenWidgets;
+    QList<QWidget *> staticWidgets;
+    QWindowSurface *windowSurface;
+#ifdef Q_BACKINGSTORE_SUBSURFACES
+    QList<QWindowSurface*> subSurfaces;
+#endif
+    bool hasDirtyFromPreviousSync;
+
+    QPoint tlwOffset;
+
+    static bool flushPaint(QWidget *widget, const QRegion &rgn);
+    static void unflushPaint(QWidget *widget, const QRegion &rgn);
+
+    bool bltRect(const QRect &rect, int dx, int dy, QWidget *widget);
+    void releaseBuffer();
+
+    void beginPaint(QRegion &toClean, QWidget *widget, QWindowSurface *windowSurface,
+                    BeginPaintInfo *returnInfo, bool toCleanIsInTopLevelCoordinates = true);
+    void endPaint(const QRegion &cleaned, QWindowSurface *windowSurface, BeginPaintInfo *beginPaintInfo);
+
+    QRegion dirtyRegion(QWidget *widget = 0) const;
+    QRegion staticContents(QWidget *widget = 0, const QRect &withinClipRect = QRect()) const;
+
+    // ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
+    void markDirty(const QRegion &rgn, QWidget *widget, bool updateImmediately = false,
+                   bool invalidateBuffer = false);
+    void markDirty(const QRect &rect, QWidget *widget, bool updateImmediately = false,
+                   bool invalidateBuffer = false);
+    void markDirtyOnScreen(const QRegion &dirtyOnScreen, QWidget *widget, const QPoint &topLevelOffset);
+
+    void removeDirtyWidget(QWidget *w);
+
+#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER)
+    bool hasDirtyWindowDecoration() const;
+    void paintWindowDecoration();
+#endif
+    void updateLists(QWidget *widget);
+
+    inline void addDirtyWidget(QWidget *widget, const QRegion &rgn)
+    {
+        if (widget && !widget->d_func()->inDirtyList && !widget->data->in_destructor) {
+            widget->d_func()->dirty = rgn;
+            dirtyWidgets.append(widget);
+            widget->d_func()->inDirtyList = true;
+        }
+    }
+
+    inline void dirtyWidgetsRemoveAll(QWidget *widget)
+    {
+        int i = 0;
+        while (i < dirtyWidgets.size()) {
+            if (dirtyWidgets.at(i) == widget)
+                dirtyWidgets.remove(i);
+            else
+                ++i;
+        }
+    }
+
+    inline void addStaticWidget(QWidget *widget)
+    {
+        if (!widget)
+            return;
+
+        Q_ASSERT(widget->testAttribute(Qt::WA_StaticContents));
+        if (!staticWidgets.contains(widget))
+            staticWidgets.append(widget);
+    }
+
+    inline void removeStaticWidget(QWidget *widget)
+    { staticWidgets.removeAll(widget); }
+
+    // Move the reparented widget and all its static children from this backing store
+    // to the new backing store if reparented into another top-level / backing store.
+    inline void moveStaticWidgets(QWidget *reparented)
+    {
+        Q_ASSERT(reparented);
+        QWidgetBackingStore *newBs = reparented->d_func()->maybeBackingStore();
+        if (newBs == this)
+            return;
+
+        int i = 0;
+        while (i < staticWidgets.size()) {
+            QWidget *w = staticWidgets.at(i);
+            if (reparented == w || reparented->isAncestorOf(w)) {
+                staticWidgets.removeAt(i);
+                if (newBs)
+                    newBs->addStaticWidget(w);
+            } else {
+                ++i;
+            }
+        }
+    }
+
+    inline QRect topLevelRect() const
+    {
+#ifdef Q_WS_QWS
+        return tlw->frameGeometry();
+#endif
+        return tlw->data->crect;
+    }
+
+    inline void appendDirtyOnScreenWidget(QWidget *widget)
+    {
+        if (!widget)
+            return;
+
+        if (!dirtyOnScreenWidgets) {
+            dirtyOnScreenWidgets = new QVector<QWidget *>;
+            dirtyOnScreenWidgets->append(widget);
+        } else if (!dirtyOnScreenWidgets->contains(widget)) {
+            dirtyOnScreenWidgets->append(widget);
+        }
+    }
+
+    inline void dirtyOnScreenWidgetsRemoveAll(QWidget *widget)
+    {
+        if (!widget || !dirtyOnScreenWidgets)
+            return;
+
+        int i = 0;
+        while (i < dirtyOnScreenWidgets->size()) {
+            if (dirtyOnScreenWidgets->at(i) == widget)
+                dirtyOnScreenWidgets->remove(i);
+            else
+                ++i;
+        }
+    }
+
+    inline void resetWidget(QWidget *widget)
+    {
+        if (widget) {
+            widget->d_func()->inDirtyList = false;
+            widget->d_func()->isScrolled = false;
+            widget->d_func()->isMoved = false;
+            widget->d_func()->dirty = QRegion();
+        }
+    }
+
+    inline void updateStaticContentsSize()
+    {
+        for (int i = 0; i < staticWidgets.size(); ++i) {
+            QWidgetPrivate *wd = staticWidgets.at(i)->d_func();
+            if (!wd->extra)
+                wd->createExtra();
+            wd->extra->staticContentsSize = wd->data.crect.size();
+        }
+    }
+
+    inline bool hasStaticContents() const
+    { return !staticWidgets.isEmpty() && windowSurface->hasStaticContentsSupport(); }
+
+    friend QRegion qt_dirtyRegion(QWidget *);
+    friend class QWidgetPrivate;
+    friend class QWidget;
+    friend class QWSManagerPrivate;
+    friend class QETWidget;
+    friend class QWindowSurface;
+    friend class QWSWindowSurface;
+};
+
+QT_END_NAMESPACE
+
+#endif // QBACKINGSTORE_P_H