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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 blink {
     35 
     36 class ResourceFetcher;
     37 class Image;
     38 class RenderObject;
     39 
     40 struct SizeAndCount {
     41     SizeAndCount(IntSize newSize = IntSize(), int newCount = 0)
     42         : 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 
     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>);
     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