Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 278 insertions, 0 deletions

diff --git a/src/gui/painting/qbackingstore_p.h b/src/gui/painting/qbackingstore_p.h
new file mode 100644
index 0000000000..05f4bfcb6c
--- /dev/null
+++ b/src/gui/painting/qbackingstore_p.h
@@ -0,0 +1,278 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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
+                 && !fullUpdatePending
+#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER)
+                 && !hasDirtyWindowDecoration()
+#endif
+                );
+    }
+
+    // ### 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);
+
+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
+    uint hasDirtyFromPreviousSync : 1;
+    uint fullUpdatePending : 1;
+
+    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;
+
+    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) {
+            QWidgetPrivate *widgetPrivate = widget->d_func();
+#ifndef QT_NO_GRAPHICSEFFECT
+            if (widgetPrivate->graphicsEffect)
+                widgetPrivate->dirty = widgetPrivate->effectiveRectFor(rgn.boundingRect());
+            else
+#endif //QT_NO_GRAPHICSEFFECT
+                widgetPrivate->dirty = rgn;
+            dirtyWidgets.append(widget);
+            widgetPrivate->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();
+#else
+        return tlw->data->crect;
+#endif
+    }
+
+    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->hasFeature(QWindowSurface::StaticContents); }
+
+    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