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 
32 namespace 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 
38 class StylePendingImage : public StyleImage {
39 public:
create(CSSImageValue * value)40     static PassRefPtr<StylePendingImage> create(CSSImageValue* value) { return adoptRef(new StylePendingImage(value)); }
41 
data()42     virtual WrappedImagePtr data() const { return m_value; }
43 
isPendingImage()44     virtual bool isPendingImage() const { return true; }
45 
cssValue()46     virtual PassRefPtr<CSSValue> cssValue() const { return m_value; }
cssImageValue()47     CSSImageValue* cssImageValue() const { return m_value; }
48 
imageSize(const RenderObject *,float)49     virtual IntSize imageSize(const RenderObject*, float /*multiplier*/) const { return IntSize(); }
imageHasRelativeWidth()50     virtual bool imageHasRelativeWidth() const { return false; }
imageHasRelativeHeight()51     virtual bool imageHasRelativeHeight() const { return false; }
usesImageContainerSize()52     virtual bool usesImageContainerSize() const { return false; }
setImageContainerSize(const IntSize &)53     virtual void setImageContainerSize(const IntSize&) { }
addClient(RenderObject *)54     virtual void addClient(RenderObject*) { }
removeClient(RenderObject *)55     virtual void removeClient(RenderObject*) { }
image(RenderObject *,const IntSize &)56     virtual PassRefPtr<Image> image(RenderObject*, const IntSize&) const
57     {
58         ASSERT_NOT_REACHED();
59         return 0;
60     }
61 
62 private:
StylePendingImage(CSSImageValue * value)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