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
|
/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "IntSize.h"
#include <wtf/HashSet.h>
#include <wtf/TypeCasts.h>
#include <wtf/WeakHashSet.h>
namespace WebCore {
class AffineTransform;
class CanvasBase;
class CanvasRenderingContext;
class Element;
class GraphicsContext;
class GraphicsContextStateSaver;
class Image;
class ImageBuffer;
class FloatRect;
class ScriptExecutionContext;
class SecurityOrigin;
class WebCoreOpaqueRoot;
class CanvasObserver : public CanMakeWeakPtr<CanvasObserver> {
public:
virtual ~CanvasObserver() = default;
virtual bool isCanvasObserverProxy() const { return false; }
virtual void canvasChanged(CanvasBase&, const std::optional<FloatRect>& changedRect) = 0;
virtual void canvasResized(CanvasBase&) = 0;
virtual void canvasDestroyed(CanvasBase&) = 0;
};
class CanvasDisplayBufferObserver : public CanMakeWeakPtr<CanvasDisplayBufferObserver> {
public:
virtual ~CanvasDisplayBufferObserver() = default;
virtual void canvasDisplayBufferPrepared(CanvasBase&) = 0;
};
class CanvasBase {
public:
virtual ~CanvasBase();
virtual void refCanvasBase() = 0;
virtual void derefCanvasBase() = 0;
virtual bool isHTMLCanvasElement() const { return false; }
virtual bool isOffscreenCanvas() const { return false; }
virtual bool isCustomPaintCanvas() const { return false; }
virtual unsigned width() const { return m_size.width(); }
virtual unsigned height() const { return m_size.height(); }
const IntSize& size() const { return m_size; }
ImageBuffer* buffer() const;
virtual AffineTransform baseTransform() const;
void makeRenderingResultsAvailable();
size_t memoryCost() const;
size_t externalMemoryCost() const;
void setOriginClean() { m_originClean = true; }
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
virtual SecurityOrigin* securityOrigin() const { return nullptr; }
ScriptExecutionContext* scriptExecutionContext() const { return canvasBaseScriptExecutionContext(); }
virtual CanvasRenderingContext* renderingContext() const = 0;
void addObserver(CanvasObserver&);
void removeObserver(CanvasObserver&);
void notifyObserversCanvasChanged(const std::optional<FloatRect>&);
void notifyObserversCanvasResized();
void notifyObserversCanvasDestroyed(); // Must be called in destruction before clearing m_context.
void addDisplayBufferObserver(CanvasDisplayBufferObserver&);
void removeDisplayBufferObserver(CanvasDisplayBufferObserver&);
void notifyObserversCanvasDisplayBufferPrepared();
bool hasDisplayBufferObservers() const { return !m_displayBufferObservers.computesEmpty(); }
HashSet<Element*> cssCanvasClients() const;
virtual GraphicsContext* drawingContext() const;
virtual GraphicsContext* existingDrawingContext() const;
virtual void didDraw(const std::optional<FloatRect>&) = 0;
virtual Image* copiedImage() const = 0;
virtual void clearCopiedImage() const = 0;
bool hasActiveInspectorCanvasCallTracer() const;
protected:
explicit CanvasBase(IntSize);
virtual ScriptExecutionContext* canvasBaseScriptExecutionContext() const = 0;
virtual void setSize(const IntSize& size) { m_size = size; }
RefPtr<ImageBuffer> setImageBuffer(RefPtr<ImageBuffer>&&) const;
virtual bool hasCreatedImageBuffer() const { return false; }
static size_t activePixelMemory();
void resetGraphicsContextState() const;
private:
virtual void createImageBuffer() const { }
mutable IntSize m_size;
mutable Lock m_imageBufferAssignmentLock;
mutable RefPtr<ImageBuffer> m_imageBuffer;
mutable size_t m_imageBufferCost { 0 };
mutable std::unique_ptr<GraphicsContextStateSaver> m_contextStateSaver;
bool m_originClean { true };
#if ASSERT_ENABLED
bool m_didNotifyObserversCanvasDestroyed { false };
#endif
WeakHashSet<CanvasObserver> m_observers;
WeakHashSet<CanvasDisplayBufferObserver> m_displayBufferObservers;
};
WebCoreOpaqueRoot root(CanvasBase*);
} // namespace WebCore
#define SPECIALIZE_TYPE_TRAITS_CANVAS(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::CanvasBase& canvas) { return canvas.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()
|
