1/*
2 * Copyright (C) 2010 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 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 StylePendingImage_h
27#define StylePendingImage_h
28
29#include "Image.h"
30#include "StyleImage.h"
31
32namespace WebCore {
33
34// StylePendingImage is a placeholder StyleImage that is entered into the RenderStyle during
35// style resolution, in order to avoid loading images that are not referenced by the final style.
36// They should never exist in a RenderStyle after it has been returned from the style selector.
37
38class StylePendingImage : public StyleImage {
39public:
40    static PassRefPtr<StylePendingImage> create(CSSImageValue* value) { return adoptRef(new StylePendingImage(value)); }
41
42    virtual WrappedImagePtr data() const { return m_value; }
43
44    virtual bool isPendingImage() const { return true; }
45
46    virtual PassRefPtr<CSSValue> cssValue() const { return m_value; }
47    CSSImageValue* cssImageValue() const { return m_value; }
48
49    virtual IntSize imageSize(const RenderObject*, float /*multiplier*/) const { return IntSize(); }
50    virtual bool imageHasRelativeWidth() const { return false; }
51    virtual bool imageHasRelativeHeight() const { return false; }
52    virtual bool usesImageContainerSize() const { return false; }
53    virtual void setImageContainerSize(const IntSize&) { }
54    virtual void addClient(RenderObject*) { }
55    virtual void removeClient(RenderObject*) { }
56    virtual PassRefPtr<Image> image(RenderObject*, const IntSize&) const
57    {
58        ASSERT_NOT_REACHED();
59        return 0;
60    }
61
62private:
63    StylePendingImage(CSSImageValue* value)
64        : m_value(value)
65    {
66    }
67
68    CSSImageValue* m_value; // Not retained; it owns us.
69};
70
71}
72#endif
73