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      1 /*
      2 Copyright (C) 2012 Google 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'' AND ANY
     14 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16 DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23 */
     24 
     25 #ifndef Canvas2DLayerManager_h
     26 #define Canvas2DLayerManager_h
     27 
     28 #include "core/platform/graphics/chromium/Canvas2DLayerBridge.h"
     29 #include "public/platform/WebThread.h"
     30 
     31 class Canvas2DLayerManagerTest;
     32 
     33 namespace WebCore {
     34 
     35 class Canvas2DLayerManager : public WebKit::WebThread::TaskObserver {
     36 public:
     37     static Canvas2DLayerManager& get();
     38     void init(size_t maxBytesAllocated, size_t targetBytesAllocated);
     39     virtual ~Canvas2DLayerManager();
     40 
     41     void layerAllocatedStorageChanged(Canvas2DLayerBridge*, intptr_t deltaBytes);
     42     void layerDidDraw(Canvas2DLayerBridge*);
     43     void layerToBeDestroyed(Canvas2DLayerBridge*);
     44 private:
     45     Canvas2DLayerManager();
     46 
     47     // internal methods
     48     void freeMemoryIfNecessary();
     49     bool isInList(Canvas2DLayerBridge*);
     50     void addLayerToList(Canvas2DLayerBridge*);
     51     void removeLayerFromList(Canvas2DLayerBridge*);
     52     virtual void willProcessTask() OVERRIDE;
     53     virtual void didProcessTask() OVERRIDE;
     54 
     55     size_t m_bytesAllocated;
     56     size_t m_maxBytesAllocated;
     57     size_t m_targetBytesAllocated;
     58     bool m_taskObserverActive;
     59     DoublyLinkedList<Canvas2DLayerBridge> m_layerList;
     60 
     61     friend class ::Canvas2DLayerManagerTest; // for unit testing
     62 };
     63 
     64 }
     65 
     66 #endif
     67 
     68