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
182
183
184
|
/*
* Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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 COMPUTER, 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 COMPUTER, 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.
*/
#ifndef HTMLCanvasElement_h
#define HTMLCanvasElement_h
#include "FloatRect.h"
#include "HTMLElement.h"
#include "IntSize.h"
#if PLATFORM(CHROMIUM) || PLATFORM(QT)
#define DefaultInterpolationQuality InterpolationMedium
#elif USE(CG)
#define DefaultInterpolationQuality InterpolationLow
#else
#define DefaultInterpolationQuality InterpolationDefault
#endif
namespace WebCore {
class CanvasContextAttributes;
class CanvasRenderingContext;
class GraphicsContext;
class GraphicsContextStateSaver;
class HTMLCanvasElement;
class Image;
class ImageData;
class ImageBuffer;
class IntSize;
class CanvasObserver {
public:
virtual ~CanvasObserver() { }
virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0;
virtual void canvasResized(HTMLCanvasElement*) = 0;
virtual void canvasDestroyed(HTMLCanvasElement*) = 0;
};
class HTMLCanvasElement : public HTMLElement {
public:
static PassRefPtr<HTMLCanvasElement> create(Document*);
static PassRefPtr<HTMLCanvasElement> create(const QualifiedName&, Document*);
virtual ~HTMLCanvasElement();
void addObserver(CanvasObserver*);
void removeObserver(CanvasObserver*);
// Attributes and functions exposed to script
int width() const { return size().width(); }
int height() const { return size().height(); }
const IntSize& size() const { return m_size; }
void setWidth(int);
void setHeight(int);
void setSize(const IntSize& newSize)
{
if (newSize == size())
return;
m_ignoreReset = true;
setWidth(newSize.width());
setHeight(newSize.height());
m_ignoreReset = false;
reset();
}
CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0);
static String toEncodingMimeType(const String& mimeType);
String toDataURL(const String& mimeType, const double* quality, ExceptionCode&);
String toDataURL(const String& mimeType, ExceptionCode& ec) { return toDataURL(mimeType, 0, ec); }
// Used for rendering
void didDraw(const FloatRect&);
void paint(GraphicsContext*, const LayoutRect&, bool useLowQualityScale = false);
GraphicsContext* drawingContext() const;
GraphicsContext* existingDrawingContext() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
ImageBuffer* buffer() const;
Image* copiedImage() const;
void clearCopiedImage();
PassRefPtr<ImageData> getImageData();
void makePresentationCopy();
void clearPresentationCopy();
FloatRect convertLogicalToDevice(const FloatRect&) const;
FloatSize convertLogicalToDevice(const FloatSize&) const;
FloatSize convertDeviceToLogical(const FloatSize&) const;
SecurityOrigin* securityOrigin() const;
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
StyleResolver* styleResolver();
AffineTransform baseTransform() const;
#if ENABLE(WEBGL)
bool is3D() const;
#endif
void makeRenderingResultsAvailable();
bool hasCreatedImageBuffer() const { return m_hasCreatedImageBuffer; }
bool shouldAccelerate(const IntSize&) const;
float deviceScaleFactor() const { return m_deviceScaleFactor; }
private:
HTMLCanvasElement(const QualifiedName&, Document*);
virtual void parseAttribute(const Attribute&) OVERRIDE;
virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
virtual void attach();
void reset();
void createImageBuffer() const;
void clearImageBuffer() const;
void setSurfaceSize(const IntSize&);
bool shouldDefer() const;
bool paintsIntoCanvasBuffer() const;
HashSet<CanvasObserver*> m_observers;
IntSize m_size;
OwnPtr<CanvasRenderingContext> m_context;
bool m_rendererIsCanvas;
bool m_ignoreReset;
FloatRect m_dirtyRect;
float m_deviceScaleFactor;
bool m_originClean;
// m_createdImageBuffer means we tried to malloc the buffer. We didn't necessarily get it.
mutable bool m_hasCreatedImageBuffer;
mutable bool m_didClearImageBuffer;
mutable OwnPtr<ImageBuffer> m_imageBuffer;
mutable OwnPtr<GraphicsContextStateSaver> m_contextStateSaver;
mutable RefPtr<Image> m_presentedImage;
mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
};
} //namespace
#endif
|
