CSSImageGeneratorValue.h revision cad810f21b803229eb11403f9209855525a25d57 
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
35namespace WebCore {
36
37class Image;
38class StyleGeneratedImage;
39class RenderObject;
40
41class CSSImageGeneratorValue : public CSSValue {
42public:
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
54protected:
55    CSSImageGeneratorValue();
56
57    Image* getImage(RenderObject*, const IntSize&);
58    void putImage(const IntSize&, PassRefPtr<Image>);
59
60    typedef pair<IntSize, int> SizeCountPair;
61    typedef HashMap<RenderObject*, SizeCountPair> RenderObjectSizeCountMap;
62
63    HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
64    RenderObjectSizeCountMap m_clients; // A map from RenderObjects (with entry count) to image sizes.
65    HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.
66
67    RefPtr<StyleGeneratedImage> m_image;
68    bool m_accessedImage;
69
70private:
71    virtual bool isImageGeneratorValue() const { return true; }
72};
73
74} // namespace WebCore
75
76#endif // CSSImageGeneratorValue_h
77