WebCore/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 "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     HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
  61     HashMap<RenderObject*, IntSize> m_clients; // A map from RenderObjects to image sizes.
  62     HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.
  63
  64     RefPtr<StyleGeneratedImage> m_image;
  65     bool m_accessedImage;
  66
  67 private:
  68     virtual bool isImageGeneratorValue() const { return true; }
  69 };
  70
  71 } // namespace WebCore
  72
  73 #endif // CSSImageGeneratorValue_h