1 files changed, 143 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
new file mode 100644
index 0000000000..a3698c4a7c
--- /dev/null
+++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
@@ -0,0 +1,143 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+** This file is part of the plugins 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 "qwindowsbackingstore.h"
+#include "qwindowswindow.h"
+#include "qwindowsnativeimage.h"
+#include "qwindowscontext.h"
+
+#include <QtGui/QWindow>
+
+#include <QtCore/QDebug>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QWindowsBackingStore
+    \brief Backing store for windows.
+    \ingroup qt-lighthouse-win
+*/
+
+QWindowsBackingStore::QWindowsBackingStore(QWindow *window) :
+    QPlatformBackingStore(window)
+{
+     if (QWindowsContext::verboseBackingStore)
+         qDebug() << __FUNCTION__ << this << window;
+}
+
+QWindowsBackingStore::~QWindowsBackingStore()
+{
+    if (QWindowsContext::verboseBackingStore)
+        qDebug() << __FUNCTION__ << this;
+}
+
+QPaintDevice *QWindowsBackingStore::paintDevice()
+{
+    Q_ASSERT(!m_image.isNull());
+    return &m_image->image();
+}
+
+void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
+                                        const QPoint &offset)
+{
+    // TODO: Prepare paint for translucent windows.
+    const QRect br = region.boundingRect();
+    if (QWindowsContext::verboseBackingStore > 1)
+        qDebug() << __FUNCTION__ << window << offset << br;
+    QWindowsWindow *rw = rasterWindow();
+    const HDC dc = rw->getDC();
+    if (!dc) {
+        qErrnoWarning("%s: GetDC failed", __FUNCTION__);
+        return;
+    }
+
+    if (!BitBlt(dc, br.x(), br.y(), br.width(), br.height(),
+                m_image->hdc(), br.x() + offset.x(), br.y() + offset.y(), SRCCOPY))
+        qErrnoWarning("%s: BitBlt failed", __FUNCTION__);
+    rw->releaseDC();
+    // Write image for debug purposes.
+    if (QWindowsContext::verboseBackingStore > 2) {
+        static int n = 0;
+        const QString fileName = QString::fromAscii("win%1_%2.png").
+                arg(rw->winId()).arg(n++);
+        m_image->image().save(fileName);
+        qDebug() << "Wrote " << m_image->image().size() << fileName;
+    }
+}
+
+void QWindowsBackingStore::resize(const QSize &size, const QRegion &region)
+{
+    if (m_image.isNull() || m_image->image().size() != size) {
+        if (QWindowsContext::verboseBackingStore) {
+            QDebug nsp = qDebug().nospace();
+            nsp << __FUNCTION__ << ' ' << rasterWindow()->window()
+                 << ' ' << size << ' ' << region;
+            if (!m_image.isNull())
+                nsp << " from: " << m_image->image().size();
+        }
+        m_image.reset(new QWindowsNativeImage(size.width(), size.height(),
+                                              QWindowsNativeImage::systemFormat()));
+    }
+}
+
+void QWindowsBackingStore::beginPaint(const QRegion &region)
+{
+    Q_UNUSED(region);
+    if (QWindowsContext::verboseBackingStore > 1)
+        qDebug() << __FUNCTION__;
+}
+
+QWindowsWindow *QWindowsBackingStore::rasterWindow() const
+{
+    if (const QWindow *w = window())
+        if (QPlatformWindow *pw = w->handle())
+            return static_cast<QWindowsWindow *>(pw);
+    return 0;
+}
+
+HDC QWindowsBackingStore::getDC() const
+{
+    if (!m_image.isNull())
+        return m_image->hdc();
+    return 0;
+}
+
+QT_END_NAMESPACE