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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 .
*/
#pragma once
#include <vcl/virdev.hxx>
#include <vcl/bitmapex.hxx>
#include <vclwrapper.hxx>
#include "outdevprovider.hxx"
#include <memory>
namespace vclcanvas
{
/** Backbuffer implementation for canvas bitmap.
This class abstracts away the renderable bitmap for the bitmap
canvas. The actual VirtualDevice is only created when
necessary, which makes read-only bitmaps a lot smaller.
*/
class BitmapBackBuffer : public OutDevProvider
{
public:
/** Create a backbuffer for given reference device
*/
BitmapBackBuffer( const BitmapEx& rBitmap,
const OutputDevice& rRefDevice );
virtual ~BitmapBackBuffer() override;
virtual OutputDevice& getOutDev() override;
virtual const OutputDevice& getOutDev() const override;
/// Clear the underlying bitmap to white, all transparent
void clear();
/** Exposing our internal bitmap. Only to be used from
CanvasBitmapHelper
@internal
*/
BitmapEx& getBitmapReference();
Size getBitmapSizePixel() const;
private:
void createVDev() const;
void updateVDev() const;
::canvas::vcltools::VCLObject<BitmapEx> maBitmap;
mutable VclPtr<VirtualDevice> mpVDev; // created only on demand
const OutputDevice& mrRefDevice;
/** When true, the bitmap contains the last valid
content. When false, and mbVDevContentIsCurrent is true,
the VDev contains the last valid content (which must be
copied back to the bitmap, when getBitmapReference() is
called). When both are false, this object is just
initialized.
*/
mutable bool mbBitmapContentIsCurrent;
/** When true, and mpVDev is non-NULL, the VDev contains the
last valid content. When false, and
mbBitmapContentIsCurrent is true, the bitmap contains the
last valid content. When both are false, this object is
just initialized.
*/
mutable bool mbVDevContentIsCurrent;
};
typedef std::shared_ptr< BitmapBackBuffer > BitmapBackBufferSharedPtr;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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