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 THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_GENERATED_IMAGE_H_
25 #define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_GENERATED_IMAGE_H_
26 
27 #include "third_party/blink/renderer/core/core_export.h"
28 #include "third_party/blink/renderer/core/style/style_image.h"
29 #include "third_party/blink/renderer/platform/wtf/casting.h"
30 
31 namespace blink {
32 
33 class CSSValue;
34 class CSSImageGeneratorValue;
35 class Document;
36 class ImageResourceObserver;
37 
38 // This class represents a generated <image> such as a gradient, cross-fade or
39 // paint(...) function.
40 class CORE_EXPORT StyleGeneratedImage final : public StyleImage {
41  public:
42   explicit StyleGeneratedImage(const CSSImageGeneratorValue&);
43 
Data()44   WrappedImagePtr Data() const override { return image_generator_value_.Get(); }
45 
46   CSSValue* CssValue() const override;
47   CSSValue* ComputedCSSValue(const ComputedStyle&,
48                              bool allow_visited_style) const override;
49 
50   FloatSize ImageSize(const Document&,
51                       float multiplier,
52                       const FloatSize& default_object_size,
53                       RespectImageOrientationEnum) const override;
HasIntrinsicSize()54   bool HasIntrinsicSize() const override { return fixed_size_; }
55   void AddClient(ImageResourceObserver*) override;
56   void RemoveClient(ImageResourceObserver*) override;
57   // The |target_size| is the desired image size
58   scoped_refptr<Image> GetImage(const ImageResourceObserver&,
59                                 const Document&,
60                                 const ComputedStyle&,
61                                 const FloatSize& target_size) const override;
62   bool KnownToBeOpaque(const Document&, const ComputedStyle&) const override;
63 
64   bool IsUsingCustomProperty(const AtomicString& custom_property_name,
65                              const Document&) const;
66 
67   void Trace(Visitor*) const override;
68 
69  private:
70   bool IsEqual(const StyleImage&) const override;
71 
72   // TODO(sashab): Replace this with <const CSSImageGeneratorValue> once
73   // Member<> supports const types.
74   Member<CSSImageGeneratorValue> image_generator_value_;
75   const bool fixed_size_;
76 };
77 
78 template <>
79 struct DowncastTraits<StyleGeneratedImage> {
80   static bool AllowFrom(const StyleImage& styleImage) {
81     return styleImage.IsGeneratedImage();
82   }
83 };
84 
85 }  // namespace blink
86 #endif
87