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
34namespace WebCore {
35
36class ResourceFetcher;
37class Image;
38class RenderObject;
39class StyleResolver;
40
41struct 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
52typedef HashMap<const RenderObject*, SizeAndCount> RenderObjectSizeCountMap;
53
54class CSSImageGeneratorValue : public CSSValue {
55public:
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
70protected:
71    explicit CSSImageGeneratorValue(ClassType);
72
73    Image* getImage(RenderObject*, const IntSize&);
74    void putImage(const IntSize&, PassRefPtr<Image>);
75    const RenderObjectSizeCountMap& clients() const { return m_clients; }
76
77    HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
78    RenderObjectSizeCountMap m_clients; // A map from RenderObjects (with entry count) to image sizes.
79    HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.
80};
81
82DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, isImageGeneratorValue());
83
84} // namespace WebCore
85
86#endif // CSSImageGeneratorValue_h
87