1/*
2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
3 *           (C) 2000 Antti Koivisto (koivisto@kde.org)
4 *           (C) 2000 Dirk Mueller (mueller@kde.org)
5 * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 *
22 */
23
24#ifndef StyleImage_h
25#define StyleImage_h
26
27#include "CSSValue.h"
28#include "FloatSize.h"
29#include "Image.h"
30#include <wtf/PassRefPtr.h>
31#include <wtf/RefCounted.h>
32#include <wtf/RefPtr.h>
33
34namespace WebCore {
35
36class CachedImage;
37class CSSValue;
38class RenderElement;
39class RenderObject;
40
41typedef const void* WrappedImagePtr;
42
43class StyleImage : public RefCounted<StyleImage> {
44public:
45    virtual ~StyleImage() { }
46
47    bool operator==(const StyleImage& other) const
48    {
49        return data() == other.data();
50    }
51
52    virtual PassRefPtr<CSSValue> cssValue() const = 0;
53
54    virtual bool canRender(const RenderObject*, float /*multiplier*/) const { return true; }
55    virtual bool isLoaded() const { return true; }
56    virtual bool errorOccurred() const { return false; }
57    virtual FloatSize imageSize(const RenderElement*, float multiplier) const = 0;
58    virtual void computeIntrinsicDimensions(const RenderElement*, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) = 0;
59    virtual bool imageHasRelativeWidth() const = 0;
60    virtual bool imageHasRelativeHeight() const = 0;
61    virtual bool usesImageContainerSize() const = 0;
62    virtual void setContainerSizeForRenderer(const RenderElement*, const FloatSize&, float) = 0;
63    virtual void addClient(RenderElement*) = 0;
64    virtual void removeClient(RenderElement*) = 0;
65    virtual PassRefPtr<Image> image(RenderElement*, const FloatSize&) const = 0;
66    virtual WrappedImagePtr data() const = 0;
67    virtual float imageScaleFactor() const { return 1; }
68    virtual bool knownToBeOpaque(const RenderElement*) const = 0;
69    virtual CachedImage* cachedImage() const { return 0; }
70
71    ALWAYS_INLINE bool isCachedImage() const { return m_isCachedImage; }
72    ALWAYS_INLINE bool isPendingImage() const { return m_isPendingImage; }
73    ALWAYS_INLINE bool isGeneratedImage() const { return m_isGeneratedImage; }
74    ALWAYS_INLINE bool isCachedImageSet() const { return m_isCachedImageSet; }
75
76    static bool imagesEquivalent(StyleImage* image1, StyleImage* image2)
77    {
78        return image1 == image2 || (image1 && image2 && *image1 == *image2);
79    }
80
81protected:
82    StyleImage()
83        : m_isCachedImage(false)
84        , m_isPendingImage(false)
85        , m_isGeneratedImage(false)
86        , m_isCachedImageSet(false)
87    {
88    }
89    bool m_isCachedImage : 1;
90    bool m_isPendingImage : 1;
91    bool m_isGeneratedImage : 1;
92    bool m_isCachedImageSet : 1;
93};
94
95#define STYLE_IMAGE_TYPE_CASTS(ToClassName, FromClassName, predicate) \
96    TYPE_CASTS_BASE(ToClassName, FromClassName, styleImage, styleImage->predicate(), styleImage.predicate())
97
98}
99#endif
100