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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 "CSSValue.h"
     30 #include "IntSizeHash.h"
     31 #include <wtf/HashMap.h>
     32 #include <wtf/HashCountedSet.h>
     33 #include <wtf/RefPtr.h>
     34 
     35 namespace WebCore {
     36 
     37 class Image;
     38 class StyleGeneratedImage;
     39 class RenderObject;
     40 
     41 class CSSImageGeneratorValue : public CSSValue {
     42 public:
     43     virtual ~CSSImageGeneratorValue();
     44 
     45     void addClient(RenderObject*, const IntSize&);
     46     void removeClient(RenderObject*);
     47     virtual Image* image(RenderObject*, const IntSize&) = 0;
     48 
     49     StyleGeneratedImage* generatedImage();
     50 
     51     virtual bool isFixedSize() const { return false; }
     52     virtual IntSize fixedSize(const RenderObject*) { return IntSize(); }
     53 
     54 protected:
     55     CSSImageGeneratorValue();
     56 
     57     Image* getImage(RenderObject*, const IntSize&);
     58     void putImage(const IntSize&, PassRefPtr<Image>);
     59 
     60     typedef pair<IntSize, int> SizeCountPair;
     61     typedef HashMap<RenderObject*, SizeCountPair> RenderObjectSizeCountMap;
     62 
     63     HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
     64     RenderObjectSizeCountMap m_clients; // A map from RenderObjects (with entry count) to image sizes.
     65     HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.
     66 
     67     RefPtr<StyleGeneratedImage> m_image;
     68     bool m_accessedImage;
     69 
     70 private:
     71     virtual bool isImageGeneratorValue() const { return true; }
     72 };
     73 
     74 } // namespace WebCore
     75 
     76 #endif // CSSImageGeneratorValue_h
     77