1 /* 2 * Copyright (C) 2013 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef ResourceLoadPriorityOptimizer_h 32 #define ResourceLoadPriorityOptimizer_h 33 34 #include "core/fetch/ImageResource.h" 35 #include "core/fetch/ResourcePtr.h" 36 #include "platform/geometry/LayoutRect.h" 37 38 #include "wtf/HashMap.h" 39 #include "wtf/HashSet.h" 40 #include "wtf/OwnPtr.h" 41 42 namespace blink { 43 44 class ResourceLoadPriorityOptimizer { 45 public: 46 enum VisibilityStatus { 47 NotVisible, 48 Visible, 49 }; 50 void notifyImageResourceVisibility(ImageResource*, VisibilityStatus, const LayoutRect&); 51 void updateAllImageResourcePriorities(); 52 void addRenderObject(RenderObject*); 53 void removeRenderObject(RenderObject*); 54 55 static ResourceLoadPriorityOptimizer* resourceLoadPriorityOptimizer(); 56 57 private: 58 ResourceLoadPriorityOptimizer(); 59 ~ResourceLoadPriorityOptimizer(); 60 61 void updateImageResourcesWithLoadPriority(); 62 63 struct ResourceAndVisibility { 64 ResourceAndVisibility(ImageResource*, VisibilityStatus, uint32_t); 65 ~ResourceAndVisibility(); 66 ResourcePtr<ImageResource> imageResource; 67 VisibilityStatus status; 68 int screenArea; 69 }; 70 71 typedef HashMap<unsigned long, OwnPtr<ResourceAndVisibility>, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned> > ImageResourceMap; 72 ImageResourceMap m_imageResources; 73 74 typedef HashSet<RenderObject*> RenderObjectSet; 75 RenderObjectSet m_objects; 76 }; 77 78 } 79 80 #endif 81