1 files changed, 104 insertions, 0 deletions
diff --git a/src/platformsupport/graphics/qrasterbackingstore.cpp b/src/platformsupport/graphics/qrasterbackingstore.cpp
new file mode 100644
index 0000000000..a64a4cfa40
--- /dev/null
+++ b/src/platformsupport/graphics/qrasterbackingstore.cpp
@@ -0,0 +1,104 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qrasterbackingstore_p.h"
+
+#include <QtGui/qpainter.h>
+
+QT_BEGIN_NAMESPACE
+
+QRasterBackingStore::QRasterBackingStore(QWindow *window)
+    : QPlatformBackingStore(window)
+{
+}
+
+QRasterBackingStore::~QRasterBackingStore()
+{
+}
+
+void QRasterBackingStore::resize(const QSize &size, const QRegion &staticContents)
+{
+    Q_UNUSED(staticContents);
+
+    int windowDevicePixelRatio = window()->devicePixelRatio();
+    QSize effectiveBufferSize = size * windowDevicePixelRatio;
+
+    if (m_image.size() == effectiveBufferSize)
+        return;
+
+    QImage::Format format = window()->format().hasAlpha() ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
+    m_image = QImage(effectiveBufferSize, format);
+    m_image.setDevicePixelRatio(windowDevicePixelRatio);
+    if (format == QImage::Format_ARGB32_Premultiplied)
+        m_image.fill(Qt::transparent);
+}
+
+QPaintDevice *QRasterBackingStore::paintDevice()
+{
+    return &m_image;
+}
+
+QImage QRasterBackingStore::toImage() const
+{
+    return m_image;
+}
+
+bool QRasterBackingStore::scroll(const QRegion &region, int dx, int dy)
+{
+    if (window()->surfaceType() != QSurface::RasterSurface)
+        return false;
+
+    extern void qt_scrollRectInImage(QImage &, const QRect &, const QPoint &);
+
+    const qreal devicePixelRatio = m_image.devicePixelRatio();
+    const QPoint delta(dx * devicePixelRatio, dy * devicePixelRatio);
+
+    foreach (const QRect &rect, region.rects())
+        qt_scrollRectInImage(m_image, QRect(rect.topLeft() * devicePixelRatio, rect.size() * devicePixelRatio), delta);
+
+    return true;
+}
+
+void QRasterBackingStore::beginPaint(const QRegion &region)
+{
+    if (!m_image.hasAlphaChannel())
+        return;
+
+    QPainter painter(&m_image);
+    painter.setCompositionMode(QPainter::CompositionMode_Source);
+    const QColor blank = Qt::transparent;
+    foreach (const QRect &rect, region.rects())
+        painter.fillRect(rect, blank);
+}
+
+QT_END_NAMESPACE