1/*
2 * Copyright (C) 2011 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 COMPUTER, 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 CSSCrossfadeValue_h
27#define CSSCrossfadeValue_h
28
29#include "core/css/CSSImageGeneratorValue.h"
30#include "core/css/CSSPrimitiveValue.h"
31#include "core/loader/cache/ImageResource.h"
32#include "core/loader/cache/ImageResourceClient.h"
33#include "core/loader/cache/ResourcePtr.h"
34#include "core/platform/graphics/Image.h"
35
36namespace WebCore {
37
38class ImageResource;
39class CrossfadeSubimageObserverProxy;
40class RenderObject;
41class Document;
42
43class CSSCrossfadeValue : public CSSImageGeneratorValue {
44    friend class CrossfadeSubimageObserverProxy;
45public:
46    static PassRefPtr<CSSCrossfadeValue> create(PassRefPtr<CSSValue> fromValue, PassRefPtr<CSSValue> toValue)
47    {
48        return adoptRef(new CSSCrossfadeValue(fromValue, toValue));
49    }
50
51    ~CSSCrossfadeValue();
52
53    String customCssText() const;
54
55    PassRefPtr<Image> image(RenderObject*, const IntSize&);
56    bool isFixedSize() const { return true; }
57    IntSize fixedSize(const RenderObject*);
58
59    bool isPending() const;
60    bool knownToBeOpaque(const RenderObject*) const;
61
62    void loadSubimages(ResourceFetcher*);
63
64    void setPercentage(PassRefPtr<CSSPrimitiveValue> percentageValue) { m_percentageValue = percentageValue; }
65
66    bool hasFailedOrCanceledSubresources() const;
67
68    bool equals(const CSSCrossfadeValue&) const;
69
70private:
71    CSSCrossfadeValue(PassRefPtr<CSSValue> fromValue, PassRefPtr<CSSValue> toValue)
72        : CSSImageGeneratorValue(CrossfadeClass)
73        , m_fromValue(fromValue)
74        , m_toValue(toValue)
75        , m_cachedFromImage(0)
76        , m_cachedToImage(0)
77        , m_crossfadeSubimageObserver(this) { }
78
79    class CrossfadeSubimageObserverProxy : public ImageResourceClient {
80    public:
81        CrossfadeSubimageObserverProxy(CSSCrossfadeValue* ownerValue)
82        : m_ownerValue(ownerValue)
83        , m_ready(false) { }
84
85        virtual ~CrossfadeSubimageObserverProxy() { }
86        virtual void imageChanged(ImageResource*, const IntRect* = 0) OVERRIDE;
87        void setReady(bool ready) { m_ready = ready; }
88    private:
89        CSSCrossfadeValue* m_ownerValue;
90        bool m_ready;
91    };
92
93    void crossfadeChanged(const IntRect&);
94
95    RefPtr<CSSValue> m_fromValue;
96    RefPtr<CSSValue> m_toValue;
97    RefPtr<CSSPrimitiveValue> m_percentageValue;
98
99    ResourcePtr<ImageResource> m_cachedFromImage;
100    ResourcePtr<ImageResource> m_cachedToImage;
101
102    RefPtr<Image> m_generatedImage;
103
104    CrossfadeSubimageObserverProxy m_crossfadeSubimageObserver;
105};
106
107} // namespace WebCore
108
109#endif // CSSCrossfadeValue_h
110