1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_IMAGE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_STYLE_IMAGE_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/graphics/image_orientation.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
namespace blink {
class CSSValue;
class FloatSize;
class Image;
class ImageResourceContent;
class SVGImage;
class Document;
class ComputedStyle;
class ImageResourceObserver;
typedef void* WrappedImagePtr;
// This class represents a CSS <image> value in ComputedStyle. The underlying
// object can be an image, a gradient or anything else defined as an <image>
// value.
class CORE_EXPORT StyleImage : public GarbageCollected<StyleImage> {
public:
virtual ~StyleImage() = default;
bool operator==(const StyleImage& other) const { return IsEqual(other); }
// Returns a CSSValue representing the origin <image> value. May not be the
// actual CSSValue from which this StyleImage was originally created if the
// CSSValue can be recreated easily (like for StyleFetchedImage) and does not
// contain per-client state (like for StyleGeneratedImage.)
virtual CSSValue* CssValue() const = 0;
// Returns a CSSValue suitable for using as part of a computed style
// value. This often means that any URLs have been made absolute, and similar
// actions described by a "Computed value" in the relevant specification.
virtual CSSValue* ComputedCSSValue(const ComputedStyle&,
bool allow_visited_style) const = 0;
// An Image can be provided for rendering by GetImage.
virtual bool CanRender() const { return true; }
// All underlying resources this <image> references has finished loading.
virtual bool IsLoaded() const { return true; }
// Any underlying resources this <image> references failed to load.
virtual bool ErrorOccurred() const { return false; }
// Determine the concrete object size of this <image>, scaled by multiplier,
// using the specified default object size. Return value as a FloatSize
// because we want integer sizes to remain integers when zoomed and then
// unzoomed. That is, (size * multiplier) / multiplier == size.
//
// The default object size is context dependent, see for instance the
// "Examples of CSS Object Sizing" section of the CSS images specification.
// https://drafts.csswg.org/css-images/#sizing.
//
// The |default_object_size| is assumed to be in the effective zoom level
// given by multiplier, i.e. if multiplier is 1 the |default_object_size| is
// not zoomed. Note that the |default_object_size| has already been snapped
// to LayoutUnit resolution because it represents the target painted size of
// a container.
//
// The size will respect the image orientation if requested and if the image
// supports it.
virtual FloatSize ImageSize(const Document&,
float multiplier,
const FloatSize& default_object_size,
RespectImageOrientationEnum) const = 0;
// The <image> has intrinsic dimensions.
//
// If this returns false, then a call to ImageSize() is expected to return
// the |default_object_size| argument that it was passed unmodified.
virtual bool HasIntrinsicSize() const = 0;
virtual void AddClient(ImageResourceObserver*) = 0;
virtual void RemoveClient(ImageResourceObserver*) = 0;
// Retrieve an Image representation for painting this <image>, at a particular
// target size. Most often, the target size is a concrete object size
// into which the image will be painted. But for background images the
// target size is the area to be filled with a single copy of the image,
// and can have a variety of relationships to the container's size. Hence
// it requires float resolution.
//
// Note that the |target_size| is in the effective zoom level of the
// computed style, i.e if the style has an effective zoom level of 1.0 the
// |target_size| is not zoomed.
virtual scoped_refptr<Image> GetImage(const ImageResourceObserver&,
const Document&,
const ComputedStyle&,
const FloatSize& target_size) const = 0;
// Opaque handle representing the underlying value of this <image>.
virtual WrappedImagePtr Data() const = 0;
// A scale factor indicating how many physical pixels in an image represent a
// logical (CSS) pixel.
virtual float ImageScaleFactor() const { return 1; }
// Returns true if it can be determined that this <image> will always provide
// an opaque Image.
virtual bool KnownToBeOpaque(const Document&, const ComputedStyle&) const = 0;
// If this <image> is intrinsically an image resource, this returns its
// underlying ImageResourceContent, or otherwise nullptr.
virtual ImageResourceContent* CachedImage() const { return nullptr; }
// Correct the image orientation preference for potentially cross-origin
// content.
virtual RespectImageOrientationEnum ForceOrientationIfNecessary(
RespectImageOrientationEnum default_orientation) const {
return default_orientation;
}
ALWAYS_INLINE bool IsImageResource() const { return is_image_resource_; }
ALWAYS_INLINE bool IsPendingImage() const { return is_pending_image_; }
ALWAYS_INLINE bool IsGeneratedImage() const { return is_generated_image_; }
ALWAYS_INLINE bool IsImageResourceSet() const {
return is_image_resource_set_;
}
ALWAYS_INLINE bool IsPaintImage() const { return is_paint_image_; }
bool IsLazyloadPossiblyDeferred() const {
return is_lazyload_possibly_deferred_;
}
virtual void Trace(Visitor* visitor) const {}
protected:
StyleImage()
: is_image_resource_(false),
is_pending_image_(false),
is_generated_image_(false),
is_image_resource_set_(false),
is_paint_image_(false),
is_lazyload_possibly_deferred_(false) {}
bool is_image_resource_ : 1;
bool is_pending_image_ : 1;
bool is_generated_image_ : 1;
bool is_image_resource_set_ : 1;
bool is_paint_image_ : 1;
bool is_lazyload_possibly_deferred_ : 1;
virtual bool IsEqual(const StyleImage&) const = 0;
FloatSize ApplyZoom(const FloatSize&, float multiplier) const;
FloatSize ImageSizeForSVGImage(SVGImage*,
float multiplier,
const FloatSize& default_object_size) const;
};
} // namespace blink
#endif
|
