/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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
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#ifndef INCLUDED_SVX_INC_SDR_OVERLAY_OVERLAYMANAGERBUFFERED_HXX
#define INCLUDED_SVX_INC_SDR_OVERLAY_OVERLAYMANAGERBUFFERED_HXX

#include <svx/sdr/overlay/overlaymanager.hxx>
#include <basegfx/range/b2irange.hxx>
#include <vcl/virdev.hxx>
#include <vcl/idle.hxx>


namespace sdr
{
    namespace overlay
    {
        class OverlayManagerBuffered final : public OverlayManager
        {
            // The VirtualDevice for draw window content buffering, this
            // is the view content without overlay
            ScopedVclPtr<VirtualDevice>             mpBufferDevice;

            // #i73602# The VirtualDevice for OverlayPaint buffering. This
            // is an extra device to avoid flickering of overlay paints
            ScopedVclPtr<VirtualDevice>             mpOutputBufferDevice;

            // Idle for buffering
            Idle                                    maBufferIdle;

            // Range for buffering (in pixel to be independent from mapMode)
            basegfx::B2IRange                       maBufferRememberedRangePixel;

            // link for timer
            DECL_LINK(ImpBufferTimerHandler, Timer*, void);

            // Internal methods for buffering
            void ImpPrepareBufferDevice();
            void ImpRestoreBackground() const ;
            void ImpRestoreBackground(const vcl::Region& rRegionPixel) const;
            void ImpSaveBackground(const vcl::Region& rRegion, OutputDevice* pPreRenderDevice);

            OverlayManagerBuffered(OutputDevice& rOutputDevice);
            virtual ~OverlayManagerBuffered() override;

        public:
            static rtl::Reference<OverlayManager> create(OutputDevice& rOutputDevice);

            // complete redraw
            virtual void completeRedraw(const vcl::Region& rRegion, OutputDevice* pPreRenderDevice = nullptr) const override;

            // flush. Do buffered updates.
            virtual void flush() override;

            // invalidate the given range at local OutputDevice
            virtual void invalidateRange(const basegfx::B2DRange& rRange) override;
        };
    } // end of namespace overlay
} // end of namespace sdr


#endif // INCLUDED_SVX_INC_SDR_OVERLAY_OVERLAYMANAGERBUFFERED_HXX

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