1 /* 2 * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef CanvasRenderingContext2D_h 27 #define CanvasRenderingContext2D_h 28 29 #include "AffineTransform.h" 30 #include "CanvasRenderingContext.h" 31 #include "FloatSize.h" 32 #include "Font.h" 33 #include "GraphicsTypes.h" 34 #include "Path.h" 35 #include "PlatformString.h" 36 #include <wtf/Vector.h> 37 38 #if PLATFORM(CG) 39 #include <ApplicationServices/ApplicationServices.h> 40 #endif 41 42 namespace WebCore { 43 44 class CanvasGradient; 45 class CanvasPattern; 46 class CanvasStyle; 47 class FloatRect; 48 class GraphicsContext; 49 class HTMLCanvasElement; 50 class HTMLImageElement; 51 class HTMLVideoElement; 52 class ImageData; 53 class KURL; 54 class TextMetrics; 55 56 typedef int ExceptionCode; 57 58 class CanvasRenderingContext2D : public CanvasRenderingContext { 59 public: 60 CanvasRenderingContext2D(HTMLCanvasElement*); 61 62 virtual ~CanvasRenderingContext2D(); 63 64 virtual bool is2d() const { return true; } 65 66 CanvasStyle* strokeStyle() const; 67 void setStrokeStyle(PassRefPtr<CanvasStyle>); 68 69 CanvasStyle* fillStyle() const; 70 void setFillStyle(PassRefPtr<CanvasStyle>); 71 72 float lineWidth() const; 73 void setLineWidth(float); 74 75 String lineCap() const; 76 void setLineCap(const String&); 77 78 String lineJoin() const; 79 void setLineJoin(const String&); 80 81 float miterLimit() const; 82 void setMiterLimit(float); 83 84 float shadowOffsetX() const; 85 void setShadowOffsetX(float); 86 87 float shadowOffsetY() const; 88 void setShadowOffsetY(float); 89 90 float shadowBlur() const; 91 void setShadowBlur(float); 92 93 String shadowColor() const; 94 void setShadowColor(const String&); 95 96 float globalAlpha() const; 97 void setGlobalAlpha(float); 98 99 String globalCompositeOperation() const; 100 void setGlobalCompositeOperation(const String&); 101 102 void save(); 103 void restore(); 104 105 void scale(float sx, float sy); 106 void rotate(float angleInRadians); 107 void translate(float tx, float ty); 108 void transform(float m11, float m12, float m21, float m22, float dx, float dy); 109 void setTransform(float m11, float m12, float m21, float m22, float dx, float dy); 110 111 void setStrokeColor(const String& color); 112 void setStrokeColor(float grayLevel); 113 void setStrokeColor(const String& color, float alpha); 114 void setStrokeColor(float grayLevel, float alpha); 115 void setStrokeColor(float r, float g, float b, float a); 116 void setStrokeColor(float c, float m, float y, float k, float a); 117 118 void setFillColor(const String& color); 119 void setFillColor(float grayLevel); 120 void setFillColor(const String& color, float alpha); 121 void setFillColor(float grayLevel, float alpha); 122 void setFillColor(float r, float g, float b, float a); 123 void setFillColor(float c, float m, float y, float k, float a); 124 125 void beginPath(); 126 void closePath(); 127 128 void moveTo(float x, float y); 129 void lineTo(float x, float y); 130 void quadraticCurveTo(float cpx, float cpy, float x, float y); 131 void bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y); 132 void arcTo(float x0, float y0, float x1, float y1, float radius, ExceptionCode&); 133 void arc(float x, float y, float r, float sa, float ea, bool clockwise, ExceptionCode&); 134 void rect(float x, float y, float width, float height); 135 136 void fill(); 137 void stroke(); 138 void clip(); 139 140 bool isPointInPath(const float x, const float y); 141 142 void clearRect(float x, float y, float width, float height); 143 void fillRect(float x, float y, float width, float height); 144 void strokeRect(float x, float y, float width, float height); 145 void strokeRect(float x, float y, float width, float height, float lineWidth); 146 147 void setShadow(float width, float height, float blur); 148 void setShadow(float width, float height, float blur, const String& color); 149 void setShadow(float width, float height, float blur, float grayLevel); 150 void setShadow(float width, float height, float blur, const String& color, float alpha); 151 void setShadow(float width, float height, float blur, float grayLevel, float alpha); 152 void setShadow(float width, float height, float blur, float r, float g, float b, float a); 153 void setShadow(float width, float height, float blur, float c, float m, float y, float k, float a); 154 155 void clearShadow(); 156 157 void drawImage(HTMLImageElement*, float x, float y); 158 void drawImage(HTMLImageElement*, float x, float y, float width, float height, ExceptionCode&); 159 void drawImage(HTMLImageElement*, const FloatRect& srcRect, const FloatRect& dstRect, ExceptionCode&); 160 void drawImage(HTMLCanvasElement*, float x, float y); 161 void drawImage(HTMLCanvasElement*, float x, float y, float width, float height, ExceptionCode&); 162 void drawImage(HTMLCanvasElement*, const FloatRect& srcRect, const FloatRect& dstRect, ExceptionCode&); 163 #if ENABLE(VIDEO) 164 void drawImage(HTMLVideoElement*, float x, float y); 165 void drawImage(HTMLVideoElement*, float x, float y, float width, float height, ExceptionCode&); 166 void drawImage(HTMLVideoElement*, const FloatRect& srcRect, const FloatRect& dstRect, ExceptionCode&); 167 #endif 168 169 void drawImageFromRect(HTMLImageElement*, float sx, float sy, float sw, float sh, 170 float dx, float dy, float dw, float dh, const String& compositeOperation); 171 172 void setAlpha(float); 173 174 void setCompositeOperation(const String&); 175 176 PassRefPtr<CanvasGradient> createLinearGradient(float x0, float y0, float x1, float y1, ExceptionCode&); 177 PassRefPtr<CanvasGradient> createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, ExceptionCode&); 178 PassRefPtr<CanvasPattern> createPattern(HTMLImageElement*, const String& repetitionType, ExceptionCode&); 179 PassRefPtr<CanvasPattern> createPattern(HTMLCanvasElement*, const String& repetitionType, ExceptionCode&); 180 181 PassRefPtr<ImageData> createImageData(float width, float height, ExceptionCode&) const; 182 PassRefPtr<ImageData> getImageData(float sx, float sy, float sw, float sh, ExceptionCode&) const; 183 void putImageData(ImageData*, float dx, float dy, ExceptionCode&); 184 void putImageData(ImageData*, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight, ExceptionCode&); 185 186 void reset(); 187 188 String font() const; 189 void setFont(const String&); 190 191 String textAlign() const; 192 void setTextAlign(const String&); 193 194 String textBaseline() const; 195 void setTextBaseline(const String&); 196 197 void fillText(const String& text, float x, float y); 198 void fillText(const String& text, float x, float y, float maxWidth); 199 void strokeText(const String& text, float x, float y); 200 void strokeText(const String& text, float x, float y, float maxWidth); 201 PassRefPtr<TextMetrics> measureText(const String& text); 202 203 LineCap getLineCap() const { return state().m_lineCap; } 204 LineJoin getLineJoin() const { return state().m_lineJoin; } 205 206 private: 207 struct State { 208 State(); 209 210 RefPtr<CanvasStyle> m_strokeStyle; 211 RefPtr<CanvasStyle> m_fillStyle; 212 float m_lineWidth; 213 LineCap m_lineCap; 214 LineJoin m_lineJoin; 215 float m_miterLimit; 216 FloatSize m_shadowOffset; 217 float m_shadowBlur; 218 String m_shadowColor; 219 float m_globalAlpha; 220 CompositeOperator m_globalComposite; 221 AffineTransform m_transform; 222 bool m_invertibleCTM; 223 224 // Text state. 225 TextAlign m_textAlign; 226 TextBaseline m_textBaseline; 227 228 String m_unparsedFont; 229 Font m_font; 230 bool m_realizedFont; 231 }; 232 Path m_path; 233 234 State& state() { return m_stateStack.last(); } 235 const State& state() const { return m_stateStack.last(); } 236 237 void applyShadow(); 238 239 enum CanvasWillDrawOption { 240 CanvasWillDrawApplyTransform = 1, 241 CanvasWillDrawApplyShadow = 1 << 1, 242 CanvasWillDrawApplyClip = 1 << 2, 243 CanvasWillDrawApplyAll = 0xffffffff 244 }; 245 246 void willDraw(const FloatRect&, unsigned options = CanvasWillDrawApplyAll); 247 248 GraphicsContext* drawingContext() const; 249 250 void applyStrokePattern(); 251 void applyFillPattern(); 252 253 void drawTextInternal(const String& text, float x, float y, bool fill, float maxWidth = 0, bool useMaxWidth = false); 254 255 const Font& accessFont(); 256 257 #if ENABLE(DASHBOARD_SUPPORT) 258 void clearPathForDashboardBackwardCompatibilityMode(); 259 #endif 260 261 void prepareGradientForDashboard(CanvasGradient* gradient) const; 262 void checkOrigin(const KURL&); 263 void checkOrigin(const String&); 264 265 Vector<State, 1> m_stateStack; 266 }; 267 268 } // namespace WebCore 269 270 #endif 271
