1 /* 2 * Copyright (C) 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef DrawingAreaProxyImpl_h 27 #define DrawingAreaProxyImpl_h 28 29 #include "BackingStore.h" 30 #include "DrawingAreaProxy.h" 31 #include "LayerTreeContext.h" 32 #include "RunLoop.h" 33 #include <wtf/OwnPtr.h> 34 #include <wtf/PassOwnPtr.h> 35 36 namespace WebKit { 37 38 class Region; 39 40 class DrawingAreaProxyImpl : public DrawingAreaProxy { 41 public: 42 static PassOwnPtr<DrawingAreaProxyImpl> create(WebPageProxy*); 43 virtual ~DrawingAreaProxyImpl(); 44 45 void paint(BackingStore::PlatformGraphicsContext, const WebCore::IntRect&, Region& unpaintedRegion); 46 47 private: 48 explicit DrawingAreaProxyImpl(WebPageProxy*); 49 50 // DrawingAreaProxy 51 virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*); 52 virtual void didReceiveSyncMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*, CoreIPC::ArgumentEncoder*); 53 virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext); 54 virtual void sizeDidChange(); 55 virtual void visibilityDidChange(); 56 virtual void setPageIsVisible(bool); 57 virtual void setBackingStoreIsDiscardable(bool); 58 59 // CoreIPC message handlers 60 virtual void update(uint64_t backingStoreStateID, const UpdateInfo&); 61 virtual void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&); 62 virtual void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&); 63 virtual void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&); 64 65 void incorporateUpdate(const UpdateInfo&); 66 67 enum RespondImmediatelyOrNot { DoNotRespondImmediately, RespondImmediately }; 68 void backingStoreStateDidChange(RespondImmediatelyOrNot); 69 void sendUpdateBackingStoreState(RespondImmediatelyOrNot); 70 void waitForAndDispatchDidUpdateBackingStoreState(); 71 72 #if USE(ACCELERATED_COMPOSITING) 73 void enterAcceleratedCompositingMode(const LayerTreeContext&); 74 void exitAcceleratedCompositingMode(); 75 isInAcceleratedCompositingMode()76 bool isInAcceleratedCompositingMode() const { return !m_layerTreeContext.isEmpty(); } 77 #else isInAcceleratedCompositingMode()78 bool isInAcceleratedCompositingMode() const { return false; } 79 #endif 80 81 void discardBackingStoreSoon(); 82 void discardBackingStore(); 83 84 // The state ID corresponding to our current backing store. Updated whenever we allocate 85 // a new backing store. Any messages received that correspond to an earlier state are ignored, 86 // as they don't apply to our current backing store. 87 uint64_t m_currentBackingStoreStateID; 88 89 // The next backing store state ID we will request the web process update to. Incremented 90 // whenever our state changes in a way that will require a new backing store to be allocated. 91 uint64_t m_nextBackingStoreStateID; 92 93 #if USE(ACCELERATED_COMPOSITING) 94 // The current layer tree context. 95 LayerTreeContext m_layerTreeContext; 96 #endif 97 98 // Whether we've sent a UpdateBackingStoreState message and are now waiting for a DidUpdateBackingStoreState message. 99 // Used to throttle UpdateBackingStoreState messages so we don't send them faster than the Web process can handle. 100 bool m_isWaitingForDidUpdateBackingStoreState; 101 102 bool m_isBackingStoreDiscardable; 103 OwnPtr<BackingStore> m_backingStore; 104 105 RunLoop::Timer<DrawingAreaProxyImpl> m_discardBackingStoreTimer; 106 }; 107 108 } // namespace WebKit 109 110 #endif // DrawingAreaProxyImpl_h 111