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diff --git a/canvas/source/vcl/bitmapbackbuffer.cxx b/canvas/source/vcl/bitmapbackbuffer.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <osl/diagnose.h>
+#include <vcl/bitmapex.hxx>
+#include <vcl/svapp.hxx>
+
+#include "bitmapbackbuffer.hxx"
+#include "impltools.hxx"
+
+namespace vclcanvas
+{
+ BitmapBackBuffer::BitmapBackBuffer( const BitmapEx& rBitmap,
+ const OutputDevice& rRefDevice ) :
+ maBitmap( rBitmap ),
+ mpVDev( nullptr ),
+ mrRefDevice( rRefDevice ),
+ mbBitmapContentIsCurrent( false ),
+ mbVDevContentIsCurrent( false )
+ {
+ }
+
+ BitmapBackBuffer::~BitmapBackBuffer()
+ {
+ // make sure solar mutex is held on deletion (other methods
+ // are supposed to be called with already locked solar mutex)
+ SolarMutexGuard aGuard;
+
+ mpVDev.disposeAndClear();
+ }
+
+ OutputDevice& BitmapBackBuffer::getOutDev()
+ {
+ createVDev();
+ updateVDev();
+ return *mpVDev;
+ }
+
+ const OutputDevice& BitmapBackBuffer::getOutDev() const
+ {
+ createVDev();
+ updateVDev();
+ return *mpVDev;
+ }
+
+ void BitmapBackBuffer::clear()
+ {
+ // force current content to bitmap, make all transparent white
+ getBitmapReference().Erase(COL_TRANSPARENT);
+ }
+
+ BitmapEx& BitmapBackBuffer::getBitmapReference()
+ {
+ OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent,
+ "BitmapBackBuffer::getBitmapReference(): Both bitmap and VDev are valid?!" );
+
+ if( mbVDevContentIsCurrent && mpVDev )
+ {
+ // VDev content is more current than bitmap - copy contents before!
+ mpVDev->EnableMapMode( false );
+ mpVDev->SetAntialiasing( AntialiasingFlags::Enable );
+ const Point aEmptyPoint;
+ *maBitmap = mpVDev->GetBitmapEx( aEmptyPoint,
+ mpVDev->GetOutputSizePixel() );
+ }
+
+ // client queries bitmap, and will possibly alter content -
+ // next time, VDev needs to be updated
+ mbBitmapContentIsCurrent = true;
+ mbVDevContentIsCurrent = false;
+
+ return *maBitmap;
+ }
+
+ Size BitmapBackBuffer::getBitmapSizePixel() const
+ {
+ Size aSize = maBitmap->GetSizePixel();
+
+ if( mbVDevContentIsCurrent && mpVDev )
+ {
+ mpVDev->EnableMapMode( false );
+ mpVDev->SetAntialiasing( AntialiasingFlags::Enable );
+ aSize = mpVDev->GetOutputSizePixel();
+ }
+
+ return aSize;
+ }
+
+ void BitmapBackBuffer::createVDev() const
+ {
+ if( mpVDev )
+ return;
+
+ // VDev not yet created, do it now. Create an alpha-VDev,
+ // if bitmap has transparency.
+ mpVDev = maBitmap->IsAlpha() ?
+ VclPtr<VirtualDevice>::Create( mrRefDevice, DeviceFormat::WITH_ALPHA ) :
+ VclPtr<VirtualDevice>::Create( mrRefDevice );
+
+ OSL_ENSURE( mpVDev,
+ "BitmapBackBuffer::createVDev(): Unable to create VirtualDevice" );
+
+ mpVDev->SetOutputSizePixel( maBitmap->GetSizePixel() );
+
+ tools::SetDefaultDeviceAntiAliasing( mpVDev );
+ }
+
+ void BitmapBackBuffer::updateVDev() const
+ {
+ OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent,
+ "BitmapBackBuffer::updateVDev(): Both bitmap and VDev are valid?!" );
+
+ if( mpVDev && mbBitmapContentIsCurrent )
+ {
+ // fill with bitmap content
+ mpVDev->EnableMapMode( false );
+ mpVDev->SetAntialiasing( AntialiasingFlags::Enable );
+ const Point aEmptyPoint;
+ mpVDev->DrawBitmapEx( aEmptyPoint, *maBitmap );
+ }
+
+ // canvas queried the VDev, and will possibly paint into
+ // it. Next time, bitmap must be updated
+ mbBitmapContentIsCurrent = false;
+ mbVDevContentIsCurrent = true;
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */