1 /* 2 * Copyright (C) 2008 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 COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef CSSImageGeneratorValue_h 27 #define CSSImageGeneratorValue_h 28 29 #include "core/css/CSSValue.h" 30 #include "platform/geometry/IntSizeHash.h" 31 #include "wtf/HashCountedSet.h" 32 #include "wtf/RefPtr.h" 33 34 namespace blink { 35 36 class ResourceFetcher; 37 class Image; 38 class RenderObject; 39 40 struct SizeAndCount { 41 SizeAndCount(IntSize newSize = IntSize(), int newCount = 0) sizeSizeAndCount42 : size(newSize) 43 , count(newCount) 44 { 45 } 46 47 IntSize size; 48 int count; 49 }; 50 51 typedef HashMap<const RenderObject*, SizeAndCount> RenderObjectSizeCountMap; 52 53 class CSSImageGeneratorValue : public CSSValue { 54 public: 55 ~CSSImageGeneratorValue(); 56 57 void addClient(RenderObject*, const IntSize&); 58 void removeClient(RenderObject*); 59 PassRefPtr<Image> image(RenderObject*, const IntSize&); 60 61 bool isFixedSize() const; 62 IntSize fixedSize(const RenderObject*); 63 64 bool isPending() const; 65 bool knownToBeOpaque(const RenderObject*) const; 66 67 void loadSubimages(ResourceFetcher*); 68 traceAfterDispatch(Visitor * visitor)69 void traceAfterDispatch(Visitor* visitor) { CSSValue::traceAfterDispatch(visitor); } 70 71 protected: 72 explicit CSSImageGeneratorValue(ClassType); 73 74 Image* getImage(RenderObject*, const IntSize&); 75 void putImage(const IntSize&, PassRefPtr<Image>); clients()76 const RenderObjectSizeCountMap& clients() const { return m_clients; } 77 78 HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use. 79 RenderObjectSizeCountMap m_clients; // A map from RenderObjects (with entry count) to image sizes. 80 HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size. 81 82 #if ENABLE(OILPAN) 83 // FIXME: Oilpan: when/if we can make the renderer point directly to the CSSImageGenerator value using 84 // a member we don't need to have this hack where we keep a persistent to the instance as long as 85 // there are clients in the RenderObjectSizeCountMap. 86 GC_PLUGIN_IGNORE("366546") 87 OwnPtr<Persistent<CSSImageGeneratorValue> > m_keepAlive; 88 #endif 89 }; 90 91 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, isImageGeneratorValue()); 92 93 } // namespace blink 94 95 #endif // CSSImageGeneratorValue_h 96