1/*
2 * Copyright (C) 2008, 2011, 2012, 2013 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 "GeneratorGeneratedImage.h"
31#include "IntSizeHash.h"
32#include "Timer.h"
33#include <wtf/HashCountedSet.h>
34#include <wtf/RefPtr.h>
35
36namespace WebCore {
37
38class CachedResourceLoader;
39class GeneratorGeneratedImage;
40class RenderObject;
41class StyleResolver;
42
43class CSSImageGeneratorValue : public CSSValue {
44public:
45    ~CSSImageGeneratorValue();
46
47    void addClient(RenderObject*);
48    void removeClient(RenderObject*);
49
50    PassRefPtr<Image> image(RenderObject*, const IntSize&);
51
52    bool isFixedSize() const;
53    IntSize fixedSize(const RenderObject*);
54
55    bool isPending() const;
56    bool knownToBeOpaque(const RenderObject*) const;
57
58    void loadSubimages(CachedResourceLoader*);
59
60protected:
61    CSSImageGeneratorValue(ClassType);
62
63    GeneratorGeneratedImage* cachedImageForSize(IntSize);
64    void saveCachedImageForSize(IntSize, PassRefPtr<GeneratorGeneratedImage>);
65    const HashCountedSet<RenderObject*>& clients() const { return m_clients; }
66
67private:
68    class CachedGeneratedImage {
69    public:
70        CachedGeneratedImage(CSSImageGeneratorValue&, IntSize, PassRefPtr<GeneratorGeneratedImage>);
71        GeneratorGeneratedImage* image() { return m_image.get(); }
72        void puntEvictionTimer() { m_evictionTimer.restart(); }
73
74    private:
75        void evictionTimerFired(DeferrableOneShotTimer<CachedGeneratedImage>*);
76
77        CSSImageGeneratorValue& m_owner;
78        IntSize m_size;
79        RefPtr<GeneratorGeneratedImage> m_image;
80        DeferrableOneShotTimer<CachedGeneratedImage> m_evictionTimer;
81    };
82
83    friend class CachedGeneratedImage;
84    void evictCachedGeneratedImage(IntSize);
85
86    HashCountedSet<RenderObject*> m_clients;
87    HashMap<IntSize, OwnPtr<CachedGeneratedImage> > m_images;
88};
89
90} // namespace WebCore
91
92#endif // CSSImageGeneratorValue_h
93