1/*
2 * Copyright (C) 2012 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 INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef CSSImageSetValue_h
27#define CSSImageSetValue_h
28
29#if ENABLE(CSS_IMAGE_SET)
30
31#include "CSSValueList.h"
32
33namespace WebCore {
34
35class CachedResourceLoader;
36class Document;
37class StyleCachedImageSet;
38class StyleImage;
39
40class CSSImageSetValue : public CSSValueList {
41public:
42
43    static PassRefPtr<CSSImageSetValue> create()
44    {
45        return adoptRef(new CSSImageSetValue());
46    }
47    ~CSSImageSetValue();
48
49    StyleCachedImageSet* cachedImageSet(CachedResourceLoader*);
50
51    // Returns a StyleCachedImageSet if the best fit image has been cached already, otherwise a StylePendingImage.
52    StyleImage* cachedOrPendingImageSet(Document*);
53
54    String customCssText() const;
55
56    bool isPending() const { return !m_accessedBestFitImage; }
57
58    struct ImageWithScale {
59        String imageURL;
60        float scaleFactor;
61    };
62
63    bool hasFailedOrCanceledSubresources() const;
64
65    PassRefPtr<CSSImageSetValue> cloneForCSSOM() const;
66
67protected:
68    ImageWithScale bestImageForScaleFactor();
69
70private:
71    CSSImageSetValue();
72    CSSImageSetValue(const CSSImageSetValue& cloneFrom);
73
74    void detachPendingImage();
75    void fillImageSet();
76    static inline bool compareByScaleFactor(ImageWithScale first, ImageWithScale second) { return first.scaleFactor < second.scaleFactor; }
77
78    RefPtr<StyleImage> m_imageSet;
79    bool m_accessedBestFitImage;
80
81    // This represents the scale factor that we used to find the best fit image. It does not necessarily
82    // correspond to the scale factor of the best fit image.
83    float m_scaleFactor;
84
85    Vector<ImageWithScale> m_imagesInSet;
86};
87
88} // namespace WebCore
89
90#endif // ENABLE(CSS_IMAGE_SET)
91
92#endif // CSSImageSetValue_h
93