third_party/WebKit/Source/core/css/CSSImageGeneratorValue.h

   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/CoreExport.h"
  30 #include "core/css/CSSValue.h"
  31 #include "platform/geometry/IntSizeHash.h"
  32 #include "wtf/HashCountedSet.h"
  33 #include "wtf/RefPtr.h"
  34
  35 namespace blink {
  36
  37 class Document;
  38 class Image;
  39 class LayoutObject;
  40
  41 struct SizeAndCount {
  42     DISALLOW_ALLOCATION();
  43     SizeAndCount(IntSize newSize = IntSize(), int newCount = 0)
  44         : size(newSize)
  45         , count(newCount)
  46     {
  47     }
  48
  49     IntSize size;
  50     int count;
  51 };
  52
  53 using LayoutObjectSizeCountMap = HashMap<const LayoutObject*, SizeAndCount>;
  54
  55 class CORE_EXPORT CSSImageGeneratorValue : public CSSValue {
  56 public:
  57     ~CSSImageGeneratorValue();
  58
  59     void addClient(LayoutObject*, const IntSize&);
  60     void removeClient(LayoutObject*);
  61     PassRefPtr<Image> image(LayoutObject*, const IntSize&);
  62
  63     bool isFixedSize() const;
  64     IntSize fixedSize(const LayoutObject*);
  65
  66     bool isPending() const;
  67     bool knownToBeOpaque(const LayoutObject*) const;
  68
  69     void loadSubimages(Document*);
  70
  71     PassRefPtrWillBeRawPtr<CSSImageGeneratorValue> valueWithURLsMadeAbsolute();
  72
  73     DEFINE_INLINE_TRACE_AFTER_DISPATCH() { CSSValue::traceAfterDispatch(visitor); }
  74
  75 protected:
  76     explicit CSSImageGeneratorValue(ClassType);
  77
  78     Image* getImage(LayoutObject*, const IntSize&);
  79     void putImage(const IntSize&, PassRefPtr<Image>);
  80     const LayoutObjectSizeCountMap& clients() const { return m_clients; }
  81
  82     HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
  83     LayoutObjectSizeCountMap m_clients; // A map from LayoutObjects (with entry count) to image sizes.
  84     HashMap<IntSize, RefPtr<Image>> m_images; // A cache of Image objects by image size.
  85
  86 #if ENABLE(OILPAN)
  87     // FIXME: Oilpan: when/if we can make the layoutObject point directly to the CSSImageGenerator value using
  88     // a member we don't need to have this hack where we keep a persistent to the instance as long as
  89     // there are clients in the LayoutObjectSizeCountMap.
  90     SelfKeepAlive<CSSImageGeneratorValue> m_keepAlive;
  91 #endif
  92 };
  93
  94 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, isImageGeneratorValue());
  95
  96 } // namespace blink
  97
  98 #endif // CSSImageGeneratorValue_h