2 * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
3 * Copyright (C) 2007 Alp Toker <alp@atoker.com>
4 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
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13 * documentation and/or other materials provided with the distribution.
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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28 #ifndef HTMLCanvasElement_h
29 #define HTMLCanvasElement_h
31 #include "FloatRect.h"
32 #include "HTMLElement.h"
35 #if PLATFORM(CHROMIUM) || PLATFORM(QT)
36 #define DefaultInterpolationQuality InterpolationMedium
38 #define DefaultInterpolationQuality InterpolationLow
40 #define DefaultInterpolationQuality InterpolationDefault
45 class CanvasContextAttributes;
46 class CanvasRenderingContext;
47 class GraphicsContext;
48 class HTMLCanvasElement;
53 class CanvasObserver {
55 virtual ~CanvasObserver() { }
57 virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0;
58 virtual void canvasResized(HTMLCanvasElement*) = 0;
59 virtual void canvasDestroyed(HTMLCanvasElement*) = 0;
62 class HTMLCanvasElement : public HTMLElement {
64 static PassRefPtr<HTMLCanvasElement> create(Document*);
65 static PassRefPtr<HTMLCanvasElement> create(const QualifiedName&, Document*);
66 virtual ~HTMLCanvasElement();
68 void addObserver(CanvasObserver*);
69 void removeObserver(CanvasObserver*);
71 // Attributes and functions exposed to script
72 int width() const { return size().width(); }
73 int height() const { return size().height(); }
75 const IntSize& size() const { return m_size; }
80 void setSize(const IntSize& newSize)
82 if (newSize == size())
85 setWidth(newSize.width());
86 setHeight(newSize.height());
87 m_ignoreReset = false;
91 CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0);
93 String toDataURL(const String& mimeType, const double* quality, ExceptionCode&);
94 String toDataURL(const String& mimeType, ExceptionCode& ec) { return toDataURL(mimeType, 0, ec); }
97 void didDraw(const FloatRect&);
99 void paint(GraphicsContext*, const IntRect&);
101 GraphicsContext* drawingContext() const;
103 CanvasRenderingContext* renderingContext() const { return m_context.get(); }
105 ImageBuffer* buffer() const;
106 Image* copiedImage() const;
107 void clearCopiedImage();
109 IntRect convertLogicalToDevice(const FloatRect&) const;
110 IntSize convertLogicalToDevice(const FloatSize&) const;
111 IntSize convertToValidDeviceSize(float width, float height) const;
113 const SecurityOrigin& securityOrigin() const;
114 void setOriginTainted() { m_originClean = false; }
115 bool originClean() const { return m_originClean; }
117 CSSStyleSelector* styleSelector();
119 AffineTransform baseTransform() const;
125 void makeRenderingResultsAvailable();
127 #ifdef ANDROID_INSTRUMENT
128 void* operator new(size_t size) {
129 return HTMLElement::operator new(size);
131 void* operator new[](size_t size) {
132 return HTMLElement::operator new[](size);
135 void operator delete(void* p, size_t size) {
136 HTMLElement::operator delete(p, size);
138 void operator delete[](void* p, size_t size) {
139 HTMLElement::operator delete[](p, size);
144 HTMLCanvasElement(const QualifiedName&, Document*);
146 virtual void parseMappedAttribute(Attribute*);
147 virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
149 virtual void attach();
151 virtual void recalcStyle(StyleChange);
155 void createImageBuffer() const;
157 void setSurfaceSize(const IntSize&);
158 bool hasCreatedImageBuffer() const { return m_hasCreatedImageBuffer; }
160 HashSet<CanvasObserver*> m_observers;
164 OwnPtr<CanvasRenderingContext> m_context;
166 bool m_rendererIsCanvas;
169 FloatRect m_dirtyRect;
171 float m_pageScaleFactor;
174 // m_createdImageBuffer means we tried to malloc the buffer. We didn't necessarily get it.
175 mutable bool m_hasCreatedImageBuffer;
176 mutable OwnPtr<ImageBuffer> m_imageBuffer;
178 mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).