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/fetch/ImageResource.h"
32#include "core/fetch/ImageResourceClient.h"
33#include "core/fetch/ResourcePtr.h"
34#include "platform/graphics/Image.h"
35
36namespace blink {
37
38class ImageResource;
39class CrossfadeSubimageObserverProxy;
40class RenderObject;
41
42class CSSCrossfadeValue : public CSSImageGeneratorValue {
43    friend class CrossfadeSubimageObserverProxy;
44public:
45    static PassRefPtrWillBeRawPtr<CSSCrossfadeValue> create(PassRefPtrWillBeRawPtr<CSSValue> fromValue, PassRefPtrWillBeRawPtr<CSSValue> toValue)
46    {
47        return adoptRefWillBeNoop(new CSSCrossfadeValue(fromValue, toValue));
48    }
49
50    ~CSSCrossfadeValue();
51
52    String customCSSText() const;
53
54    PassRefPtr<Image> image(RenderObject*, const IntSize&);
55    bool isFixedSize() const { return true; }
56    IntSize fixedSize(const RenderObject*);
57
58    bool isPending() const;
59    bool knownToBeOpaque(const RenderObject*) const;
60
61    void loadSubimages(ResourceFetcher*);
62
63    void setPercentage(PassRefPtrWillBeRawPtr<CSSPrimitiveValue> percentageValue) { m_percentageValue = percentageValue; }
64
65    bool hasFailedOrCanceledSubresources() const;
66
67    bool equals(const CSSCrossfadeValue&) const;
68
69    void traceAfterDispatch(Visitor*);
70
71private:
72    CSSCrossfadeValue(PassRefPtrWillBeRawPtr<CSSValue> fromValue, PassRefPtrWillBeRawPtr<CSSValue> toValue)
73        : CSSImageGeneratorValue(CrossfadeClass)
74        , m_fromValue(fromValue)
75        , m_toValue(toValue)
76        , m_cachedFromImage(0)
77        , m_cachedToImage(0)
78        , m_crossfadeSubimageObserver(this) { }
79
80    class CrossfadeSubimageObserverProxy FINAL : public ImageResourceClient {
81    public:
82        CrossfadeSubimageObserverProxy(CSSCrossfadeValue* ownerValue)
83        : m_ownerValue(ownerValue)
84        , m_ready(false) { }
85
86        virtual ~CrossfadeSubimageObserverProxy() { }
87        virtual void imageChanged(ImageResource*, const IntRect* = 0) OVERRIDE;
88        void setReady(bool ready) { m_ready = ready; }
89    private:
90        CSSCrossfadeValue* m_ownerValue;
91        bool m_ready;
92    };
93
94    void crossfadeChanged(const IntRect&);
95
96    RefPtrWillBeMember<CSSValue> m_fromValue;
97    RefPtrWillBeMember<CSSValue> m_toValue;
98    RefPtrWillBeMember<CSSPrimitiveValue> m_percentageValue;
99
100    ResourcePtr<ImageResource> m_cachedFromImage;
101    ResourcePtr<ImageResource> m_cachedToImage;
102
103    RefPtr<Image> m_generatedImage;
104
105    CrossfadeSubimageObserverProxy m_crossfadeSubimageObserver;
106};
107
108DEFINE_CSS_VALUE_TYPE_CASTS(CSSCrossfadeValue, isCrossfadeValue());
109
110} // namespace blink
111
112#endif // CSSCrossfadeValue_h
113