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 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 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 "FloatSize.h"
31#include "FloatSizeHash.h"
32#include "Timer.h"
33#include <wtf/HashCountedSet.h>
34
35namespace WebCore {
36
37class CachedImage;
38class CachedResourceLoader;
39class GeneratedImage;
40class Image;
41class RenderElement;
42class StyleResolver;
43
44class CSSImageGeneratorValue : public CSSValue {
45public:
46    ~CSSImageGeneratorValue();
47
48    void addClient(RenderElement*);
49    void removeClient(RenderElement*);
50
51    PassRefPtr<Image> image(RenderElement*, const FloatSize&);
52
53    bool isFixedSize() const;
54    FloatSize fixedSize(const RenderElement*);
55
56    bool isPending() const;
57    bool knownToBeOpaque(const RenderElement*) const;
58
59    void loadSubimages(CachedResourceLoader*);
60
61protected:
62    CSSImageGeneratorValue(ClassType);
63
64    GeneratedImage* cachedImageForSize(FloatSize);
65    void saveCachedImageForSize(FloatSize, PassRefPtr<GeneratedImage>);
66    const HashCountedSet<RenderElement*>& clients() const { return m_clients; }
67
68    // Helper functions for Crossfade and Filter.
69    static CachedImage* cachedImageForCSSValue(CSSValue*, CachedResourceLoader*);
70    static bool subimageIsPending(CSSValue*);
71
72private:
73    class CachedGeneratedImage {
74    public:
75        CachedGeneratedImage(CSSImageGeneratorValue&, FloatSize, PassRefPtr<GeneratedImage>);
76        GeneratedImage* image() { return m_image.get(); }
77        void puntEvictionTimer() { m_evictionTimer.restart(); }
78
79    private:
80        void evictionTimerFired();
81
82        CSSImageGeneratorValue& m_owner;
83        FloatSize m_size;
84        RefPtr<GeneratedImage> m_image;
85        DeferrableOneShotTimer m_evictionTimer;
86    };
87
88    friend class CachedGeneratedImage;
89    void evictCachedGeneratedImage(FloatSize);
90
91    HashCountedSet<RenderElement*> m_clients;
92    HashMap<FloatSize, std::unique_ptr<CachedGeneratedImage>> m_images;
93};
94
95CSS_VALUE_TYPE_CASTS(CSSImageGeneratorValue, isImageGeneratorValue())
96
97} // namespace WebCore
98
99#endif // CSSImageGeneratorValue_h
100