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 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#pragma once
27
28#include "CachedImageClient.h"
29#include "CachedResourceHandle.h"
30#include "CSSImageGeneratorValue.h"
31#include <wtf/Function.h>
32
33namespace WebCore {
34
35class CSSPrimitiveValue;
36
37class CSSCrossfadeValue final : public CSSImageGeneratorValue {
38public:
39 static Ref<CSSCrossfadeValue> create(Ref<CSSValue>&& fromValue, Ref<CSSValue>&& toValue, Ref<CSSPrimitiveValue>&& percentageValue, bool prefixed = false);
40
41 ~CSSCrossfadeValue();
42
43 String customCSSText() const;
44
45 Image* image(RenderElement&, const FloatSize&);
46 bool isFixedSize() const { return true; }
47 FloatSize fixedSize(const RenderElement&);
48
49 bool isPrefixed() const { return m_isPrefixed; }
50 bool isPending() const;
51 bool knownToBeOpaque(const RenderElement&) const;
52
53 void loadSubimages(CachedResourceLoader&, const ResourceLoaderOptions&);
54
55 bool traverseSubresources(const WTF::Function<bool (const CachedResource&)>& handler) const;
56
57 RefPtr<CSSCrossfadeValue> blend(const CSSCrossfadeValue&, double) const;
58
59 bool equals(const CSSCrossfadeValue&) const;
60 bool equalInputImages(const CSSCrossfadeValue&) const;
61
62private:
63 CSSCrossfadeValue(Ref<CSSValue>&& fromValue, Ref<CSSValue>&& toValue, Ref<CSSPrimitiveValue>&& percentageValue, bool prefixed);
64
65 class SubimageObserver final : public CachedImageClient {
66 public:
67 SubimageObserver(CSSCrossfadeValue&);
68 private:
69 void imageChanged(CachedImage*, const IntRect*) final;
70 CSSCrossfadeValue& m_owner;
71 };
72
73 void crossfadeChanged();
74
75 Ref<CSSValue> m_fromValue;
76 Ref<CSSValue> m_toValue;
77 Ref<CSSPrimitiveValue> m_percentageValue;
78
79 CachedResourceHandle<CachedImage> m_cachedFromImage;
80 CachedResourceHandle<CachedImage> m_cachedToImage;
81
82 RefPtr<Image> m_generatedImage;
83
84 SubimageObserver m_subimageObserver;
85 bool m_isPrefixed { false };
86 bool m_subimagesAreReady { false };
87};
88
89} // namespace WebCore
90
91SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSCrossfadeValue, isCrossfadeValue())
92