bitmapbackbuffer.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#pragma once
 
#include <vcl/virdev.hxx>
#include <vcl/bitmapex.hxx>
 
#include <vclwrapper.hxx>
#include "outdevprovider.hxx"
 
#include <memory>
 
namespace vclcanvas
{
    class BitmapBackBuffer : public OutDevProvider
    {
    public:
        BitmapBackBuffer( const BitmapEx&       rBitmap,
                          const OutputDevice&   rRefDevice );
 
        virtual ~BitmapBackBuffer() override;
 
        virtual OutputDevice&       getOutDev() override;
        virtual const OutputDevice& getOutDev() const override;
 
        void clear();
 
        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;
 
        mutable bool                            mbBitmapContentIsCurrent;
 
        mutable bool                            mbVDevContentIsCurrent;
    };
 
    typedef std::shared_ptr< BitmapBackBuffer > BitmapBackBufferSharedPtr;
 
}
 
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