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 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#include "CSSImageValue.h"
32#include "StyleImage.h"
33
34#if ENABLE(CSS_IMAGE_SET)
35#include "CSSImageSetValue.h"
36#endif
37
38namespace WebCore {
39
40// StylePendingImage is a placeholder StyleImage that is entered into the RenderStyle during
41// style resolution, in order to avoid loading images that are not referenced by the final style.
42// They should never exist in a RenderStyle after it has been returned from the style selector.
43
44class StylePendingImage : public StyleImage {
45public:
46    static PassRefPtr<StylePendingImage> create(CSSValue* value) { return adoptRef(new StylePendingImage(value)); }
47
48    CSSImageValue* cssImageValue() const { return m_value && m_value->isImageValue() ? toCSSImageValue(m_value) : nullptr; }
49    CSSImageGeneratorValue* cssImageGeneratorValue() const { return m_value && m_value->isImageGeneratorValue() ? static_cast<CSSImageGeneratorValue*>(m_value) : nullptr; }
50    CSSCursorImageValue* cssCursorImageValue() const { return m_value && m_value->isCursorImageValue() ? toCSSCursorImageValue(m_value) : nullptr; }
51
52#if ENABLE(CSS_IMAGE_SET)
53    CSSImageSetValue* cssImageSetValue() const { return m_value && m_value->isImageSetValue() ? toCSSImageSetValue(m_value) : nullptr; }
54#endif
55
56    void detachFromCSSValue() { m_value = nullptr; }
57
58private:
59    virtual WrappedImagePtr data() const override { return const_cast<StylePendingImage*>(this); }
60
61    virtual PassRefPtr<CSSValue> cssValue() const override { return m_value; }
62
63    virtual FloatSize imageSize(const RenderElement*, float /*multiplier*/) const override { return FloatSize(); }
64    virtual bool imageHasRelativeWidth() const override { return false; }
65    virtual bool imageHasRelativeHeight() const override { return false; }
66    virtual void computeIntrinsicDimensions(const RenderElement*, Length& /* intrinsicWidth */ , Length& /* intrinsicHeight */, FloatSize& /* intrinsicRatio */) { }
67    virtual bool usesImageContainerSize() const override { return false; }
68    virtual void setContainerSizeForRenderer(const RenderElement*, const FloatSize&, float) override { }
69    virtual void addClient(RenderElement*) override { }
70    virtual void removeClient(RenderElement*) override { }
71
72    virtual PassRefPtr<Image> image(RenderElement*, const FloatSize&) const override
73    {
74        ASSERT_NOT_REACHED();
75        return nullptr;
76    }
77
78    virtual bool knownToBeOpaque(const RenderElement*) const override { return false; }
79
80    StylePendingImage(CSSValue* value)
81        : m_value(value)
82    {
83        m_isPendingImage = true;
84    }
85
86    CSSValue* m_value; // Not retained; it owns us.
87};
88
89STYLE_IMAGE_TYPE_CASTS(StylePendingImage, StyleImage, isPendingImage)
90
91}
92
93#endif
94