1 /*
2 * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #include "config.h"
21 #include "JSCanvasRenderingContext2D.h"
22
23 #include "CanvasGradient.h"
24 #include "CanvasPattern.h"
25 #include "CanvasRenderingContext2D.h"
26 #include "CanvasStyle.h"
27 #include "ExceptionCode.h"
28 #include "FloatRect.h"
29 #include "HTMLCanvasElement.h"
30 #include "HTMLImageElement.h"
31 #include "HTMLVideoElement.h"
32 #include "ImageData.h"
33 #include "JSCanvasGradient.h"
34 #include "JSCanvasPattern.h"
35 #include "JSHTMLCanvasElement.h"
36 #include "JSHTMLImageElement.h"
37 #include "JSHTMLVideoElement.h"
38 #include "JSImageData.h"
39 #include <runtime/Error.h>
40
41 using namespace JSC;
42
43 namespace WebCore {
44
toJS(ExecState * exec,JSDOMGlobalObject * globalObject,CanvasStyle * style)45 static JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, CanvasStyle* style)
46 {
47 if (style->canvasGradient())
48 return toJS(exec, globalObject, style->canvasGradient());
49 if (style->canvasPattern())
50 return toJS(exec, globalObject, style->canvasPattern());
51 return jsString(exec, style->color());
52 }
53
toHTMLCanvasStyle(ExecState *,JSValue value)54 static PassRefPtr<CanvasStyle> toHTMLCanvasStyle(ExecState*, JSValue value)
55 {
56 if (!value.isObject())
57 return 0;
58 JSObject* object = asObject(value);
59 if (object->inherits(&JSCanvasGradient::s_info))
60 return CanvasStyle::createFromGradient(static_cast<JSCanvasGradient*>(object)->impl());
61 if (object->inherits(&JSCanvasPattern::s_info))
62 return CanvasStyle::createFromPattern(static_cast<JSCanvasPattern*>(object)->impl());
63 return 0;
64 }
65
strokeStyle(ExecState * exec) const66 JSValue JSCanvasRenderingContext2D::strokeStyle(ExecState* exec) const
67 {
68 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
69 return toJS(exec, globalObject(), context->strokeStyle());
70 }
71
setStrokeStyle(ExecState * exec,JSValue value)72 void JSCanvasRenderingContext2D::setStrokeStyle(ExecState* exec, JSValue value)
73 {
74 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
75 if (value.isString()) {
76 context->setStrokeColor(ustringToString(asString(value)->value(exec)));
77 return;
78 }
79 context->setStrokeStyle(toHTMLCanvasStyle(exec, value));
80 }
81
fillStyle(ExecState * exec) const82 JSValue JSCanvasRenderingContext2D::fillStyle(ExecState* exec) const
83 {
84 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
85 return toJS(exec, globalObject(), context->fillStyle());
86 }
87
setFillStyle(ExecState * exec,JSValue value)88 void JSCanvasRenderingContext2D::setFillStyle(ExecState* exec, JSValue value)
89 {
90 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
91 if (value.isString()) {
92 context->setFillColor(ustringToString(asString(value)->value(exec)));
93 return;
94 }
95 context->setFillStyle(toHTMLCanvasStyle(exec, value));
96 }
97
setFillColor(ExecState * exec)98 JSValue JSCanvasRenderingContext2D::setFillColor(ExecState* exec)
99 {
100 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
101
102 // string arg = named color
103 // number arg = gray color
104 // string arg, number arg = named color, alpha
105 // number arg, number arg = gray color, alpha
106 // 4 args = r, g, b, a
107 // 5 args = c, m, y, k, a
108 switch (exec->argumentCount()) {
109 case 1:
110 if (exec->argument(0).isString())
111 context->setFillColor(ustringToString(asString(exec->argument(0))->value(exec)));
112 else
113 context->setFillColor(exec->argument(0).toFloat(exec));
114 break;
115 case 2:
116 if (exec->argument(0).isString())
117 context->setFillColor(ustringToString(asString(exec->argument(0))->value(exec)), exec->argument(1).toFloat(exec));
118 else
119 context->setFillColor(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec));
120 break;
121 case 4:
122 context->setFillColor(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
123 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec));
124 break;
125 case 5:
126 context->setFillColor(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
127 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec));
128 break;
129 default:
130 return throwSyntaxError(exec);
131 }
132 return jsUndefined();
133 }
134
setStrokeColor(ExecState * exec)135 JSValue JSCanvasRenderingContext2D::setStrokeColor(ExecState* exec)
136 {
137 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
138
139 // string arg = named color
140 // number arg = gray color
141 // string arg, number arg = named color, alpha
142 // number arg, number arg = gray color, alpha
143 // 4 args = r, g, b, a
144 // 5 args = c, m, y, k, a
145 switch (exec->argumentCount()) {
146 case 1:
147 if (exec->argument(0).isString())
148 context->setStrokeColor(ustringToString(asString(exec->argument(0))->value(exec)));
149 else
150 context->setStrokeColor(exec->argument(0).toFloat(exec));
151 break;
152 case 2:
153 if (exec->argument(0).isString())
154 context->setStrokeColor(ustringToString(asString(exec->argument(0))->value(exec)), exec->argument(1).toFloat(exec));
155 else
156 context->setStrokeColor(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec));
157 break;
158 case 4:
159 context->setStrokeColor(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
160 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec));
161 break;
162 case 5:
163 context->setStrokeColor(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
164 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec));
165 break;
166 default:
167 return throwSyntaxError(exec);
168 }
169
170 return jsUndefined();
171 }
172
setLineDash(ExecState * exec)173 JSValue JSCanvasRenderingContext2D::setLineDash(ExecState* exec)
174 {
175 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
176 JSValue value = exec->argument(0);
177 JSObject* array = asObject(value);
178 uint32_t length = array->get(exec, JSC::Identifier(exec, "length")).toInt32(exec);
179 DashArray lineDash;
180 for(uint32_t i = 0; i < length; i++) {
181 JSValue v = array->get(exec, i);
182 lineDash.append(v.toNumber(exec));
183 }
184 context->setLineDash(lineDash, lineDash[0]);
185 return jsUndefined();
186 }
187
strokeRect(ExecState * exec)188 JSValue JSCanvasRenderingContext2D::strokeRect(ExecState* exec)
189 {
190 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
191
192 if (exec->argumentCount() <= 4)
193 context->strokeRect(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
194 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec));
195 else
196 context->strokeRect(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
197 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec));
198
199 return jsUndefined();
200 }
201
drawImage(ExecState * exec)202 JSValue JSCanvasRenderingContext2D::drawImage(ExecState* exec)
203 {
204 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
205
206 // DrawImage has three variants:
207 // drawImage(img, dx, dy)
208 // drawImage(img, dx, dy, dw, dh)
209 // drawImage(img, sx, sy, sw, sh, dx, dy, dw, dh)
210 // Composite operation is specified with globalCompositeOperation.
211 // The img parameter can be a <img> or <canvas> element.
212 JSValue value = exec->argument(0);
213 if (value.isNull()) {
214 setDOMException(exec, TYPE_MISMATCH_ERR);
215 return jsUndefined();
216 }
217 if (!value.isObject())
218 return throwTypeError(exec);
219
220 JSObject* o = asObject(value);
221 ExceptionCode ec = 0;
222 if (o->inherits(&JSHTMLImageElement::s_info)) {
223 HTMLImageElement* imgElt = static_cast<HTMLImageElement*>(static_cast<JSHTMLElement*>(o)->impl());
224 switch (exec->argumentCount()) {
225 case 3:
226 context->drawImage(imgElt, exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec), ec);
227 break;
228 case 5:
229 context->drawImage(imgElt, exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
230 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec), ec);
231 setDOMException(exec, ec);
232 break;
233 case 9:
234 context->drawImage(imgElt, FloatRect(exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
235 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec)),
236 FloatRect(exec->argument(5).toFloat(exec), exec->argument(6).toFloat(exec),
237 exec->argument(7).toFloat(exec), exec->argument(8).toFloat(exec)), ec);
238 setDOMException(exec, ec);
239 break;
240 default:
241 return throwSyntaxError(exec);
242 }
243 } else if (o->inherits(&JSHTMLCanvasElement::s_info)) {
244 HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(static_cast<JSHTMLElement*>(o)->impl());
245 switch (exec->argumentCount()) {
246 case 3:
247 context->drawImage(canvas, exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec), ec);
248 setDOMException(exec, ec);
249 break;
250 case 5:
251 context->drawImage(canvas, exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
252 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec), ec);
253 setDOMException(exec, ec);
254 break;
255 case 9:
256 context->drawImage(canvas, FloatRect(exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
257 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec)),
258 FloatRect(exec->argument(5).toFloat(exec), exec->argument(6).toFloat(exec),
259 exec->argument(7).toFloat(exec), exec->argument(8).toFloat(exec)), ec);
260 setDOMException(exec, ec);
261 break;
262 default:
263 return throwSyntaxError(exec);
264 }
265 #if ENABLE(VIDEO)
266 } else if (o->inherits(&JSHTMLVideoElement::s_info)) {
267 HTMLVideoElement* video = static_cast<HTMLVideoElement*>(static_cast<JSHTMLElement*>(o)->impl());
268 switch (exec->argumentCount()) {
269 case 3:
270 context->drawImage(video, exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec), ec);
271 break;
272 case 5:
273 context->drawImage(video, exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
274 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec), ec);
275 setDOMException(exec, ec);
276 break;
277 case 9:
278 context->drawImage(video, FloatRect(exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
279 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec)),
280 FloatRect(exec->argument(5).toFloat(exec), exec->argument(6).toFloat(exec),
281 exec->argument(7).toFloat(exec), exec->argument(8).toFloat(exec)), ec);
282 setDOMException(exec, ec);
283 break;
284 default:
285 return throwSyntaxError(exec);
286 }
287 #endif
288 } else
289 return throwTypeError(exec);
290
291 return jsUndefined();
292 }
293
drawImageFromRect(ExecState * exec)294 JSValue JSCanvasRenderingContext2D::drawImageFromRect(ExecState* exec)
295 {
296 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
297
298 JSValue value = exec->argument(0);
299 if (!value.isObject())
300 return throwTypeError(exec);
301 JSObject* o = asObject(value);
302
303 if (!o->inherits(&JSHTMLImageElement::s_info))
304 return throwTypeError(exec);
305 context->drawImageFromRect(static_cast<HTMLImageElement*>(static_cast<JSHTMLElement*>(o)->impl()),
306 exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
307 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec),
308 exec->argument(5).toFloat(exec), exec->argument(6).toFloat(exec),
309 exec->argument(7).toFloat(exec), exec->argument(8).toFloat(exec),
310 ustringToString(exec->argument(9).toString(exec)));
311 return jsUndefined();
312 }
313
setShadow(ExecState * exec)314 JSValue JSCanvasRenderingContext2D::setShadow(ExecState* exec)
315 {
316 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
317
318 switch (exec->argumentCount()) {
319 case 3:
320 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
321 exec->argument(2).toFloat(exec));
322 break;
323 case 4:
324 if (exec->argument(3).isString())
325 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
326 exec->argument(2).toFloat(exec), ustringToString(asString(exec->argument(3))->value(exec)));
327 else
328 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
329 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec));
330 break;
331 case 5:
332 if (exec->argument(3).isString())
333 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
334 exec->argument(2).toFloat(exec), ustringToString(asString(exec->argument(3))->value(exec)),
335 exec->argument(4).toFloat(exec));
336 else
337 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
338 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec),
339 exec->argument(4).toFloat(exec));
340 break;
341 case 7:
342 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
343 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec),
344 exec->argument(4).toFloat(exec), exec->argument(5).toFloat(exec),
345 exec->argument(6).toFloat(exec));
346 break;
347 case 8:
348 context->setShadow(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec),
349 exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec),
350 exec->argument(4).toFloat(exec), exec->argument(5).toFloat(exec),
351 exec->argument(6).toFloat(exec), exec->argument(7).toFloat(exec));
352 break;
353 default:
354 return throwSyntaxError(exec);
355 }
356
357 return jsUndefined();
358 }
359
createPattern(ExecState * exec)360 JSValue JSCanvasRenderingContext2D::createPattern(ExecState* exec)
361 {
362 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
363
364 JSValue value = exec->argument(0);
365 if (!value.isObject()) {
366 setDOMException(exec, TYPE_MISMATCH_ERR);
367 return jsUndefined();
368 }
369 JSObject* o = asObject(value);
370
371 if (o->inherits(&JSHTMLImageElement::s_info)) {
372 ExceptionCode ec;
373 JSValue pattern = toJS(exec, globalObject(),
374 context->createPattern(static_cast<HTMLImageElement*>(static_cast<JSHTMLElement*>(o)->impl()),
375 valueToStringWithNullCheck(exec, exec->argument(1)), ec).get());
376 setDOMException(exec, ec);
377 return pattern;
378 }
379 if (o->inherits(&JSHTMLCanvasElement::s_info)) {
380 ExceptionCode ec;
381 JSValue pattern = toJS(exec, globalObject(),
382 context->createPattern(static_cast<HTMLCanvasElement*>(static_cast<JSHTMLElement*>(o)->impl()),
383 valueToStringWithNullCheck(exec, exec->argument(1)), ec).get());
384 setDOMException(exec, ec);
385 return pattern;
386 }
387 setDOMException(exec, TYPE_MISMATCH_ERR);
388 return jsUndefined();
389 }
390
createImageData(ExecState * exec)391 JSValue JSCanvasRenderingContext2D::createImageData(ExecState* exec)
392 {
393 // createImageData has two variants
394 // createImageData(ImageData)
395 // createImageData(width, height)
396 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
397 RefPtr<ImageData> imageData = 0;
398
399 ExceptionCode ec = 0;
400 if (exec->argumentCount() == 1)
401 imageData = context->createImageData(toImageData(exec->argument(0)), ec);
402 else if (exec->argumentCount() == 2)
403 imageData = context->createImageData(exec->argument(0).toFloat(exec), exec->argument(1).toFloat(exec), ec);
404
405 setDOMException(exec, ec);
406 return toJS(exec, globalObject(), WTF::getPtr(imageData));
407 }
408
putImageData(ExecState * exec)409 JSValue JSCanvasRenderingContext2D::putImageData(ExecState* exec)
410 {
411 // putImageData has two variants
412 // putImageData(ImageData, x, y)
413 // putImageData(ImageData, x, y, dirtyX, dirtyY, dirtyWidth, dirtyHeight)
414 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
415
416 ExceptionCode ec = 0;
417 if (exec->argumentCount() >= 7)
418 context->putImageData(toImageData(exec->argument(0)), exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec),
419 exec->argument(3).toFloat(exec), exec->argument(4).toFloat(exec), exec->argument(5).toFloat(exec), exec->argument(6).toFloat(exec), ec);
420 else
421 context->putImageData(toImageData(exec->argument(0)), exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec), ec);
422
423 setDOMException(exec, ec);
424 return jsUndefined();
425 }
426
fillText(ExecState * exec)427 JSValue JSCanvasRenderingContext2D::fillText(ExecState* exec)
428 {
429 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
430
431 // string arg = text to draw
432 // number arg = x
433 // number arg = y
434 // optional number arg = maxWidth
435 if (exec->argumentCount() < 3 || exec->argumentCount() > 4)
436 return throwSyntaxError(exec);
437
438 if (exec->argumentCount() == 4)
439 context->fillText(ustringToString(exec->argument(0).toString(exec)), exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec));
440 else
441 context->fillText(ustringToString(exec->argument(0).toString(exec)), exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec));
442 return jsUndefined();
443 }
444
strokeText(ExecState * exec)445 JSValue JSCanvasRenderingContext2D::strokeText(ExecState* exec)
446 {
447 CanvasRenderingContext2D* context = static_cast<CanvasRenderingContext2D*>(impl());
448
449 // string arg = text to draw
450 // number arg = x
451 // number arg = y
452 // optional number arg = maxWidth
453 if (exec->argumentCount() < 3 || exec->argumentCount() > 4)
454 return throwSyntaxError(exec);
455
456 if (exec->argumentCount() == 4)
457 context->strokeText(ustringToString(exec->argument(0).toString(exec)), exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec), exec->argument(3).toFloat(exec));
458 else
459 context->strokeText(ustringToString(exec->argument(0).toString(exec)), exec->argument(1).toFloat(exec), exec->argument(2).toFloat(exec));
460 return jsUndefined();
461 }
462
463 } // namespace WebCore
464