1 /* 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. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 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 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef HTMLCanvasElement_h 29 #define HTMLCanvasElement_h 30 31 #include "FloatRect.h" 32 #include "HTMLElement.h" 33 #include "IntSize.h" 34 35 #if PLATFORM(CHROMIUM) || PLATFORM(QT) 36 #define DefaultInterpolationQuality InterpolationMedium 37 #elif USE(CG) 38 #define DefaultInterpolationQuality InterpolationLow 39 #else 40 #define DefaultInterpolationQuality InterpolationDefault 41 #endif 42 43 namespace WebCore { 44 45 class CanvasContextAttributes; 46 class CanvasRenderingContext; 47 class GraphicsContext; 48 class HTMLCanvasElement; 49 class Image; 50 class ImageData; 51 class ImageBuffer; 52 class IntSize; 53 54 class CanvasObserver { 55 public: ~CanvasObserver()56 virtual ~CanvasObserver() { } 57 58 virtual void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect) = 0; 59 virtual void canvasResized(HTMLCanvasElement*) = 0; 60 virtual void canvasDestroyed(HTMLCanvasElement*) = 0; 61 }; 62 63 class HTMLCanvasElement : public HTMLElement { 64 public: 65 static PassRefPtr<HTMLCanvasElement> create(Document*); 66 static PassRefPtr<HTMLCanvasElement> create(const QualifiedName&, Document*); 67 virtual ~HTMLCanvasElement(); 68 69 void addObserver(CanvasObserver*); 70 void removeObserver(CanvasObserver*); 71 72 // Attributes and functions exposed to script width()73 int width() const { return size().width(); } height()74 int height() const { return size().height(); } 75 size()76 const IntSize& size() const { return m_size; } 77 78 void setWidth(int); 79 void setHeight(int); 80 setSize(const IntSize & newSize)81 void setSize(const IntSize& newSize) 82 { 83 if (newSize == size()) 84 return; 85 m_ignoreReset = true; 86 setWidth(newSize.width()); 87 setHeight(newSize.height()); 88 m_ignoreReset = false; 89 reset(); 90 } 91 92 CanvasRenderingContext* getContext(const String&, CanvasContextAttributes* attributes = 0); 93 94 String toDataURL(const String& mimeType, const double* quality, ExceptionCode&); toDataURL(const String & mimeType,ExceptionCode & ec)95 String toDataURL(const String& mimeType, ExceptionCode& ec) { return toDataURL(mimeType, 0, ec); } 96 97 // Used for rendering 98 void didDraw(const FloatRect&); 99 100 void paint(GraphicsContext*, const IntRect&); 101 102 GraphicsContext* drawingContext() const; 103 GraphicsContext* existingDrawingContext() const; 104 renderingContext()105 CanvasRenderingContext* renderingContext() const { return m_context.get(); } 106 107 ImageBuffer* buffer() const; 108 Image* copiedImage() const; 109 void clearCopiedImage(); 110 PassRefPtr<ImageData> getImageData(); 111 void makePresentationCopy(); 112 void clearPresentationCopy(); 113 114 IntRect convertLogicalToDevice(const FloatRect&) const; 115 IntSize convertLogicalToDevice(const FloatSize&) const; 116 IntSize convertToValidDeviceSize(float width, float height) const; 117 118 const SecurityOrigin& securityOrigin() const; setOriginTainted()119 void setOriginTainted() { m_originClean = false; } originClean()120 bool originClean() const { return m_originClean; } 121 122 CSSStyleSelector* styleSelector(); 123 124 AffineTransform baseTransform() const; 125 126 #if ENABLE(WEBGL) 127 bool is3D() const; 128 #endif 129 130 void makeRenderingResultsAvailable(); 131 132 private: 133 HTMLCanvasElement(const QualifiedName&, Document*); 134 135 virtual void parseMappedAttribute(Attribute*); 136 virtual RenderObject* createRenderer(RenderArena*, RenderStyle*); 137 138 void reset(); 139 140 void createImageBuffer() const; 141 142 void setSurfaceSize(const IntSize&); hasCreatedImageBuffer()143 bool hasCreatedImageBuffer() const { return m_hasCreatedImageBuffer; } 144 145 HashSet<CanvasObserver*> m_observers; 146 147 IntSize m_size; 148 149 OwnPtr<CanvasRenderingContext> m_context; 150 151 bool m_rendererIsCanvas; 152 153 bool m_ignoreReset; 154 FloatRect m_dirtyRect; 155 156 float m_pageScaleFactor; 157 bool m_originClean; 158 159 // m_createdImageBuffer means we tried to malloc the buffer. We didn't necessarily get it. 160 mutable bool m_hasCreatedImageBuffer; 161 mutable OwnPtr<ImageBuffer> m_imageBuffer; 162 163 mutable RefPtr<Image> m_presentedImage; 164 mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue). 165 }; 166 167 } //namespace 168 169 #endif 170