97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_SOURCE_VCL_BITMAPBACKBUFFER_HXX
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#define INCLUDED_SOURCE_VCL_BITMAPBACKBUFFER_HXX
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#include <vcl/virdev.hxx>
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#include <vcl/bitmapex.hxx>
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#include <canvas/vclwrapper.hxx>
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#include "outdevprovider.hxx"
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#include <boost/shared_ptr.hpp>
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namespace vclcanvas
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{
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/** Backbuffer implementation for canvas bitmap.
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This class abstracts away the renderable bitmap for the bitmap
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canvas. The actual VirtualDevice is only created when
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necessary, which makes read-only bitmaps a lot smaller.
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*/
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class BitmapBackBuffer : public OutDevProvider
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{
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public:
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/** Create a backbuffer for given reference device
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*/
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BitmapBackBuffer( const BitmapEx& rBitmap,
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const OutputDevice& rRefDevice );
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~BitmapBackBuffer();
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virtual OutputDevice& getOutDev();
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virtual const OutputDevice& getOutDev() const;
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/// Clear the underlying bitmap to white, all transparent
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void clear();
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/** Exposing our internal bitmap. Only to be used from
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CanvasBitmapHelper
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@internal
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*/
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BitmapEx& getBitmapReference();
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Size getBitmapSizePixel() const;
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private:
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void createVDev() const;
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void updateVDev() const;
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::canvas::vcltools::VCLObject<BitmapEx> maBitmap;
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mutable VirtualDevice* mpVDev; // created only on demand
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const OutputDevice& mrRefDevice;
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/** When true, the bitmap contains the last valid
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content. When false, and mbVDevContentIsCurrent is true,
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the VDev contains the last valid content (which must be
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copied back to the bitmap, when getBitmapReference() is
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called). When both are false, this object is just
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initialized.
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*/
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mutable bool mbBitmapContentIsCurrent;
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/** When true, and mpVDev is non-NULL, the VDev contains the
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last valid content. When false, and
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mbBitmapContentIsCurrent is true, the bitmap contains the
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last valid content. When both are false, this object is
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just initialized.
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*/
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mutable bool mbVDevContentIsCurrent;
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};
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typedef ::boost::shared_ptr< BitmapBackBuffer > BitmapBackBufferSharedPtr;
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}
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#endif // INCLUDED_SOURCE_VCL_BITMAPBACKBUFFER_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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