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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DrawingAreaProxyImpl_h
#define DrawingAreaProxyImpl_h
#include "BackingStore.h"
#include "DrawingAreaProxy.h"
#include "LayerTreeContext.h"
#include "RunLoop.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebKit {
class Region;
class DrawingAreaProxyImpl : public DrawingAreaProxy {
public:
static PassOwnPtr<DrawingAreaProxyImpl> create(WebPageProxy*);
virtual ~DrawingAreaProxyImpl();
void paint(BackingStore::PlatformGraphicsContext, const WebCore::IntRect&, Region& unpaintedRegion);
private:
explicit DrawingAreaProxyImpl(WebPageProxy*);
// DrawingAreaProxy
virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
virtual void didReceiveSyncMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*, CoreIPC::ArgumentEncoder*);
virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext);
virtual void sizeDidChange();
virtual void visibilityDidChange();
virtual void setPageIsVisible(bool);
// CoreIPC message handlers
virtual void update(uint64_t backingStoreStateID, const UpdateInfo&);
virtual void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&);
virtual void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&);
virtual void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&);
void incorporateUpdate(const UpdateInfo&);
enum RespondImmediatelyOrNot { DoNotRespondImmediately, RespondImmediately };
void backingStoreStateDidChange(RespondImmediatelyOrNot);
void sendUpdateBackingStoreState(RespondImmediatelyOrNot);
void waitForAndDispatchDidUpdateBackingStoreState();
void enterAcceleratedCompositingMode(const LayerTreeContext&);
void exitAcceleratedCompositingMode();
bool isInAcceleratedCompositingMode() const { return !m_layerTreeContext.isEmpty(); }
void discardBackingStoreSoon();
void discardBackingStore();
// The state ID corresponding to our current backing store. Updated whenever we allocate
// a new backing store. Any messages received that correspond to an earlier state are ignored,
// as they don't apply to our current backing store.
uint64_t m_currentBackingStoreStateID;
// The next backing store state ID we will request the web process update to. Incremented
// whenever our state changes in a way that will require a new backing store to be allocated.
uint64_t m_nextBackingStoreStateID;
// The current layer tree context.
LayerTreeContext m_layerTreeContext;
// Whether we've sent a UpdateBackingStoreState message and are now waiting for a DidUpdateBackingStoreState message.
// Used to throttle UpdateBackingStoreState messages so we don't send them faster than the Web process can handle.
bool m_isWaitingForDidUpdateBackingStoreState;
OwnPtr<BackingStore> m_backingStore;
RunLoop::Timer<DrawingAreaProxyImpl> m_discardBackingStoreTimer;
};
} // namespace WebKit
#endif // DrawingAreaProxyImpl_h
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