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      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 WebCore {
     35 
     36 class ResourceFetcher;
     37 class Image;
     38 class RenderObject;
     39 class StyleResolver;
     40 
     41 struct SizeAndCount {
     42     SizeAndCount(IntSize newSize = IntSize(), int newCount = 0)
     43         : size(newSize)
     44         , count(newCount)
     45     {
     46     }
     47 
     48     IntSize size;
     49     int count;
     50 };
     51 
     52 typedef HashMap<const RenderObject*, SizeAndCount> RenderObjectSizeCountMap;
     53 
     54 class CSSImageGeneratorValue : public CSSValue {
     55 public:
     56     ~CSSImageGeneratorValue();
     57 
     58     void addClient(RenderObject*, const IntSize&);
     59     void removeClient(RenderObject*);
     60     PassRefPtr<Image> image(RenderObject*, const IntSize&);
     61 
     62     bool isFixedSize() const;
     63     IntSize fixedSize(const RenderObject*);
     64 
     65     bool isPending() const;
     66     bool knownToBeOpaque(const RenderObject*) const;
     67 
     68     void loadSubimages(ResourceFetcher*);
     69 
     70     void traceAfterDispatch(Visitor* visitor) { CSSValue::traceAfterDispatch(visitor); }
     71 
     72 protected:
     73     explicit CSSImageGeneratorValue(ClassType);
     74 
     75     Image* getImage(RenderObject*, const IntSize&);
     76     void putImage(const IntSize&, PassRefPtr<Image>);
     77     const RenderObjectSizeCountMap& clients() const { return m_clients; }
     78 
     79     HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
     80     RenderObjectSizeCountMap m_clients; // A map from RenderObjects (with entry count) to image sizes.
     81     HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.
     82 
     83 #if ENABLE(OILPAN)
     84     // FIXME: Oilpan: when/if we can make the renderer point directly to the CSSImageGenerator value using
     85     // a member we don't need to have this hack where we keep a persistent to the instance as long as
     86     // there are clients in the RenderObjectSizeCountMap.
     87     GC_PLUGIN_IGNORE("366546")
     88     OwnPtr<Persistent<CSSImageGeneratorValue> > m_keepAlive;
     89 #endif
     90 };
     91 
     92 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, isImageGeneratorValue());
     93 
     94 } // namespace WebCore
     95 
     96 #endif // CSSImageGeneratorValue_h
     97