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 "CSSCursorImageValue.h"
30#include "CSSImageGeneratorValue.h"
31#if ENABLE(CSS_IMAGE_SET)
32#include "CSSImageSetValue.h"
33#endif
34#include "CSSImageValue.h"
35#include "StyleImage.h"
36
37namespace WebCore {
38
39// StylePendingImage is a placeholder StyleImage that is entered into the RenderStyle during
40// style resolution, in order to avoid loading images that are not referenced by the final style.
41// They should never exist in a RenderStyle after it has been returned from the style selector.
42
43class StylePendingImage : public StyleImage {
44public:
45    static PassRefPtr<StylePendingImage> create(CSSValue* value) { return adoptRef(new StylePendingImage(value)); }
46
47    virtual WrappedImagePtr data() const { return static_cast<CSSImageValue*>(m_value); }
48
49    virtual PassRefPtr<CSSValue> cssValue() const { return m_value; }
50    CSSImageValue* cssImageValue() const { return m_value && m_value->isImageValue() ? static_cast<CSSImageValue*>(m_value) : nullptr; }
51    CSSImageGeneratorValue* cssImageGeneratorValue() const { return m_value && m_value->isImageGeneratorValue() ? static_cast<CSSImageGeneratorValue*>(m_value) : nullptr; }
52    CSSCursorImageValue* cssCursorImageValue() const { return m_value && m_value->isCursorImageValue() ? static_cast<CSSCursorImageValue*>(m_value) : nullptr; }
53#if ENABLE(CSS_IMAGE_SET)
54    CSSImageSetValue* cssImageSetValue() const { return m_value && m_value->isImageSetValue() ? static_cast<CSSImageSetValue*>(m_value) : nullptr; }
55#endif
56
57    void detachFromCSSValue() { m_value = nullptr; }
58
59    virtual LayoutSize imageSize(const RenderObject*, float /*multiplier*/) const OVERRIDE { return LayoutSize(); }
60    virtual bool imageHasRelativeWidth() const { return false; }
61    virtual bool imageHasRelativeHeight() const { return false; }
62    virtual void computeIntrinsicDimensions(const RenderObject*, Length& /* intrinsicWidth */ , Length& /* intrinsicHeight */, FloatSize& /* intrinsicRatio */) { }
63    virtual bool usesImageContainerSize() const { return false; }
64    virtual void setContainerSizeForRenderer(const RenderObject*, const IntSize&, float) { }
65    virtual void addClient(RenderObject*) { }
66    virtual void removeClient(RenderObject*) { }
67    virtual PassRefPtr<Image> image(RenderObject*, const IntSize&) const
68    {
69        ASSERT_NOT_REACHED();
70        return 0;
71    }
72    virtual bool knownToBeOpaque(const RenderObject*) const { return false; }
73
74private:
75    StylePendingImage(CSSValue* value)
76        : m_value(value)
77    {
78        m_isPendingImage = true;
79    }
80
81    CSSValue* m_value; // Not retained; it owns us.
82};
83
84}
85
86#endif
87