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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 "Color.h"
32 #include "FloatSize.h"
33 #include "Font.h"
34 #include "GraphicsTypes.h"
35 #include "Path.h"
36 #include "PlatformString.h"
37 
38 #include <wtf/Vector.h>
39 
40 #if USE(CG)
41 #include <ApplicationServices/ApplicationServices.h>
42 #endif
43 
44 #if USE(ACCELERATED_COMPOSITING)
45 #include "GraphicsLayer.h"
46 #endif
47 
48 namespace WebCore {
49 
50 class CanvasGradient;
51 class CanvasPattern;
52 class CanvasStyle;
53 class FloatRect;
54 class GraphicsContext;
55 class HTMLCanvasElement;
56 class HTMLImageElement;
57 class HTMLVideoElement;
58 class ImageData;
59 class TextMetrics;
60 
61 #if ENABLE(ACCELERATED_2D_CANVAS)
62 class DrawingBuffer;
63 class SharedGraphicsContext3D;
64 #endif
65 
66 typedef int ExceptionCode;
67 
68 class CanvasRenderingContext2D : public CanvasRenderingContext {
69 public:
70     CanvasRenderingContext2D(HTMLCanvasElement*, bool usesCSSCompatibilityParseMode, bool usesDashboardCompatibilityMode);
71 
72     virtual ~CanvasRenderingContext2D();
73 
is2d()74     virtual bool is2d() const { return true; }
75     virtual bool isAccelerated() const;
76     virtual bool paintsIntoCanvasBuffer() const;
77 
78     CanvasStyle* strokeStyle() const;
79     void setStrokeStyle(PassRefPtr<CanvasStyle>);
80 
81     CanvasStyle* fillStyle() const;
82     void setFillStyle(PassRefPtr<CanvasStyle>);
83 
84     float lineWidth() const;
85     void setLineWidth(float);
86 
87     String lineCap() const;
88     void setLineCap(const String&);
89 
90     String lineJoin() const;
91     void setLineJoin(const String&);
92 
93     float miterLimit() const;
94     void setMiterLimit(float);
95 
96     float shadowOffsetX() const;
97     void setShadowOffsetX(float);
98 
99     float shadowOffsetY() const;
100     void setShadowOffsetY(float);
101 
102     float shadowBlur() const;
103     void setShadowBlur(float);
104 
105     String shadowColor() const;
106     void setShadowColor(const String&);
107 
108     float globalAlpha() const;
109     void setGlobalAlpha(float);
110 
111     String globalCompositeOperation() const;
112     void setGlobalCompositeOperation(const String&);
113 
114     void save();
115     void restore();
116     void setAllAttributesToDefault();
117 
118     void scale(float sx, float sy);
119     void rotate(float angleInRadians);
120     void translate(float tx, float ty);
121     void transform(float m11, float m12, float m21, float m22, float dx, float dy);
122     void setTransform(float m11, float m12, float m21, float m22, float dx, float dy);
123 
124     void setStrokeColor(const String& color);
125     void setStrokeColor(float grayLevel);
126     void setStrokeColor(const String& color, float alpha);
127     void setStrokeColor(float grayLevel, float alpha);
128     void setStrokeColor(float r, float g, float b, float a);
129     void setStrokeColor(float c, float m, float y, float k, float a);
130 
131     void setFillColor(const String& color);
132     void setFillColor(float grayLevel);
133     void setFillColor(const String& color, float alpha);
134     void setFillColor(float grayLevel, float alpha);
135     void setFillColor(float r, float g, float b, float a);
136     void setFillColor(float c, float m, float y, float k, float a);
137 
138     void beginPath();
139     void closePath();
140 
141     void moveTo(float x, float y);
142     void lineTo(float x, float y);
143     void quadraticCurveTo(float cpx, float cpy, float x, float y);
144     void bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y);
145     void arcTo(float x0, float y0, float x1, float y1, float radius, ExceptionCode&);
146     void arc(float x, float y, float r, float sa, float ea, bool clockwise, ExceptionCode&);
147     void rect(float x, float y, float width, float height);
148 
149     void fill();
150     void stroke();
151     void clip();
152 
153     bool isPointInPath(const float x, const float y);
154 
155     void clearRect(float x, float y, float width, float height);
156     void fillRect(float x, float y, float width, float height);
157     void strokeRect(float x, float y, float width, float height);
158     void strokeRect(float x, float y, float width, float height, float lineWidth);
159 
160     void setShadow(float width, float height, float blur);
161     void setShadow(float width, float height, float blur, const String& color);
162     void setShadow(float width, float height, float blur, float grayLevel);
163     void setShadow(float width, float height, float blur, const String& color, float alpha);
164     void setShadow(float width, float height, float blur, float grayLevel, float alpha);
165     void setShadow(float width, float height, float blur, float r, float g, float b, float a);
166     void setShadow(float width, float height, float blur, float c, float m, float y, float k, float a);
167 
168     void clearShadow();
169 
170     void drawImage(HTMLImageElement*, float x, float y, ExceptionCode&);
171     void drawImage(HTMLImageElement*, float x, float y, float width, float height, ExceptionCode&);
172     void drawImage(HTMLImageElement*, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh, ExceptionCode&);
173     void drawImage(HTMLImageElement*, const FloatRect& srcRect, const FloatRect& dstRect, ExceptionCode&);
174     void drawImage(HTMLCanvasElement*, float x, float y, ExceptionCode&);
175     void drawImage(HTMLCanvasElement*, float x, float y, float width, float height, ExceptionCode&);
176     void drawImage(HTMLCanvasElement*, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh, ExceptionCode&);
177     void drawImage(HTMLCanvasElement*, const FloatRect& srcRect, const FloatRect& dstRect, ExceptionCode&);
178     void drawImage(HTMLImageElement*, const FloatRect& srcRect, const FloatRect& dstRect, const CompositeOperator&, ExceptionCode&);
179 #if ENABLE(VIDEO)
180     void drawImage(HTMLVideoElement*, float x, float y, ExceptionCode&);
181     void drawImage(HTMLVideoElement*, float x, float y, float width, float height, ExceptionCode&);
182     void drawImage(HTMLVideoElement*, float sx, float sy, float sw, float sh, float dx, float dy, float dw, float dh, ExceptionCode&);
183     void drawImage(HTMLVideoElement*, const FloatRect& srcRect, const FloatRect& dstRect, ExceptionCode&);
184 #endif
185 
186     void drawImageFromRect(HTMLImageElement*, float sx, float sy, float sw, float sh,
187         float dx, float dy, float dw, float dh, const String& compositeOperation);
188 
189     void setAlpha(float);
190 
191     void setCompositeOperation(const String&);
192 
193     PassRefPtr<CanvasGradient> createLinearGradient(float x0, float y0, float x1, float y1, ExceptionCode&);
194     PassRefPtr<CanvasGradient> createRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, ExceptionCode&);
195     PassRefPtr<CanvasPattern> createPattern(HTMLImageElement*, const String& repetitionType, ExceptionCode&);
196     PassRefPtr<CanvasPattern> createPattern(HTMLCanvasElement*, const String& repetitionType, ExceptionCode&);
197 
198     PassRefPtr<ImageData> createImageData(PassRefPtr<ImageData>, ExceptionCode&) const;
199     PassRefPtr<ImageData> createImageData(float width, float height, ExceptionCode&) const;
200     PassRefPtr<ImageData> getImageData(float sx, float sy, float sw, float sh, ExceptionCode&) const;
201     void putImageData(ImageData*, float dx, float dy, ExceptionCode&);
202     void putImageData(ImageData*, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight, ExceptionCode&);
203 
204     void reset();
205 
206     String font() const;
207     void setFont(const String&);
208 
209     String textAlign() const;
210     void setTextAlign(const String&);
211 
212     String textBaseline() const;
213     void setTextBaseline(const String&);
214 
215     void fillText(const String& text, float x, float y);
216     void fillText(const String& text, float x, float y, float maxWidth);
217     void strokeText(const String& text, float x, float y);
218     void strokeText(const String& text, float x, float y, float maxWidth);
219     PassRefPtr<TextMetrics> measureText(const String& text);
220 
getLineCap()221     LineCap getLineCap() const { return state().m_lineCap; }
getLineJoin()222     LineJoin getLineJoin() const { return state().m_lineJoin; }
223 
224     virtual void paintRenderingResultsToCanvas();
225 
226 #if ENABLE(ACCELERATED_2D_CANVAS) && USE(ACCELERATED_COMPOSITING)
227     virtual PlatformLayer* platformLayer() const;
228 #endif
229 
230 private:
231     struct State : FontSelectorClient {
232         State();
233         virtual ~State();
234 
235         State(const State&);
236         State& operator=(const State&);
237 
238         virtual void fontsNeedUpdate(FontSelector*);
239 
240         String m_unparsedStrokeColor;
241         String m_unparsedFillColor;
242         RefPtr<CanvasStyle> m_strokeStyle;
243         RefPtr<CanvasStyle> m_fillStyle;
244         float m_lineWidth;
245         LineCap m_lineCap;
246         LineJoin m_lineJoin;
247         float m_miterLimit;
248         FloatSize m_shadowOffset;
249         float m_shadowBlur;
250         RGBA32 m_shadowColor;
251         float m_globalAlpha;
252         CompositeOperator m_globalComposite;
253         AffineTransform m_transform;
254         bool m_invertibleCTM;
255 
256         // Text state.
257         TextAlign m_textAlign;
258         TextBaseline m_textBaseline;
259 
260         String m_unparsedFont;
261         Font m_font;
262         bool m_realizedFont;
263     };
264     Path m_path;
265 
state()266     State& state() { return m_stateStack.last(); }
state()267     const State& state() const { return m_stateStack.last(); }
268 
269     void applyShadow();
270 
271     enum CanvasDidDrawOption {
272         CanvasDidDrawApplyNone = 0,
273         CanvasDidDrawApplyTransform = 1,
274         CanvasDidDrawApplyShadow = 1 << 1,
275         CanvasDidDrawApplyClip = 1 << 2,
276         CanvasDidDrawApplyAll = 0xffffffff
277     };
278 
279     void didDraw(const FloatRect&, unsigned options = CanvasDidDrawApplyAll);
280 
281     GraphicsContext* drawingContext() const;
282 
283     void applyStrokePattern();
284     void applyFillPattern();
285 
286     void drawTextInternal(const String& text, float x, float y, bool fill, float maxWidth = 0, bool useMaxWidth = false);
287 
288     const Font& accessFont();
289 
290 #if ENABLE(DASHBOARD_SUPPORT)
291     void clearPathForDashboardBackwardCompatibilityMode();
292 #endif
293 
294     void prepareGradientForDashboard(CanvasGradient* gradient) const;
295 
296     Vector<State, 1> m_stateStack;
297     bool m_usesCSSCompatibilityParseMode;
298 #if ENABLE(DASHBOARD_SUPPORT)
299     bool m_usesDashboardCompatibilityMode;
300 #endif
301 
302 #if ENABLE(ACCELERATED_2D_CANVAS)
303     RefPtr<DrawingBuffer> m_drawingBuffer;
304     RefPtr<SharedGraphicsContext3D> m_context3D;
305 #endif
306 };
307 
308 } // namespace WebCore
309 
310 #endif
311