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1   /*
2    * Copyright (c) 2002-2025 Gargoyle Software Inc.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * https://www.apache.org/licenses/LICENSE-2.0
8    *
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed under the License is distributed on an "AS IS" BASIS,
11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12   * See the License for the specific language governing permissions and
13   * limitations under the License.
14   */
15  package org.htmlunit.javascript.host.html;
16  
17  import org.htmlunit.WebDriverTestCase;
18  import org.htmlunit.junit.BrowserRunner;
19  import org.htmlunit.junit.annotation.Alerts;
20  import org.htmlunit.junit.annotation.HtmlUnitNYI;
21  import org.junit.Test;
22  import org.junit.runner.RunWith;
23  
24  /**
25   * Unit tests for {@link HTMLCanvasElement}.
26   *
27   * @author Ahmed Ashour
28   * @author Frank Danek
29   * @author Ronald Brill
30   */
31  @RunWith(BrowserRunner.class)
32  public class HTMLCanvasElementTest extends WebDriverTestCase {
33  
34      /**
35       * @throws Exception if an error occurs
36       */
37      @Test
38      @Alerts({"300", "number", "150", "number", "[object CanvasRenderingContext2D]"})
39      public void test() throws Exception {
40          final String html = DOCTYPE_HTML
41              + "<html>\n"
42              + "  <head>\n"
43              + "    <script>\n"
44              + LOG_TITLE_FUNCTION
45              + "      function test() {\n"
46              + "        var canvas = document.getElementById('myCanvas');\n"
47              + "        log(canvas.width);\n"
48              + "        log(typeof canvas.width);\n"
49              + "        log(canvas.height);\n"
50              + "        log(typeof canvas.height);\n"
51              + "        if (canvas.getContext){\n"
52              + "          var ctx = canvas.getContext('2d');\n"
53              + "          log(ctx);\n"
54              + "        }\n"
55              + "      }\n"
56              + "    </script>\n"
57              + "  </head>\n"
58              + "  <body onload='test()'><canvas id='myCanvas'></canvas></body>\n"
59              + "</html>";
60  
61          loadPageVerifyTitle2(html);
62      }
63  
64      /**
65       * @throws Exception if an error occurs
66       */
67      @Test
68      @Alerts(DEFAULT = "data:image/png;base64,"
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104             FF_ESR = "data:image/png;base64,"
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122     public void toDataUrl() throws Exception {
123         final String html = DOCTYPE_HTML
124             + "<html>\n"
125             + "<body><canvas id='myCanvas'></canvas>\n"
126             + LOG_TEXTAREA
127             + "<script>\n"
128             + LOG_TEXTAREA_FUNCTION
129             + "try {\n"
130             + "  var canvas = document.getElementById('myCanvas');\n"
131             + "  log(canvas.toDataURL());\n"
132             + "}\n"
133             + "catch(e) { logEx(e); }\n"
134             + "</script>\n"
135             + "</body>\n"
136             + "</html>";
137         loadPageVerifyTextArea2(html);
138     }
139 
140 
141     /**
142      * @throws Exception if an error occurs
143      */
144     @Test
145     @Alerts(DEFAULT = "data:image/png;base64,"
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181             FF_ESR = "data:image/png;base64,"
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195                     + "BgZaoSlAABg+UHCBDICBisTFWCEiBgsPwAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAA"
196                     + "gYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVAwGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlAABg+UHCBDICBisTFWCEiBgsP"
197                     + "wAAQIZAYOVqUpQAgQMlh8gQCAjYLAyVQlKgIDB8gMECGQEDFamKkEJEDBYfoAAgYyAwcpUJSgBAgbLDxAgkBEwWJmqBCVA"
198                     + "wGD5AQIEMgIGK1OVoAQIGCw/QIBARsBgZaoSlACBB1YxAJfjJb2jAAAAAElFTkSuQmCC")
199     public void toDataUrlPng() throws Exception {
200         final String html = DOCTYPE_HTML
201             + "<html>\n"
202             + "<body><canvas id='myCanvas'></canvas>\n"
203             + LOG_TEXTAREA
204             + "<script>\n"
205             + LOG_TEXTAREA_FUNCTION
206             + "try {\n"
207             + "  var canvas = document.getElementById('myCanvas');\n"
208             + "  log(canvas.toDataURL('image/png'));\n"
209             + "}\n"
210             + "catch(e) { logEx(e); }\n"
211             + "</script>\n"
212             + "</body>\n"
213             + "</html>";
214         loadPageVerifyTextArea2(html);
215     }
216 
217     /**
218      * @throws Exception if an error occurs
219      */
220     @Test
221     @Alerts({"[object CanvasRenderingContext2D]", "[object WebGLRenderingContext]",
222              "[object WebGLRenderingContext]", "[object WebGL2RenderingContext]", "null", "null"})
223     @HtmlUnitNYI(CHROME = {"[object CanvasRenderingContext2D]", "null", "null", "null", "null", "null"},
224             EDGE = {"[object CanvasRenderingContext2D]", "null", "null", "null", "null", "null"},
225             FF = {"[object CanvasRenderingContext2D]", "null", "null", "null", "null", "null"},
226             FF_ESR = {"[object CanvasRenderingContext2D]", "null", "null", "null", "null", "null"})
227     public void getContext() throws Exception {
228         final String html = DOCTYPE_HTML
229             + "<html>\n"
230             + "  <head>\n"
231             + "    <script>\n"
232             + LOG_TITLE_FUNCTION
233             + "      function test() {\n"
234             + "        var canvas = document.createElement('canvas');\n"
235             + "        if (canvas.getContext){\n"
236             + "          log(document.createElement('canvas').getContext('2d'));\n"
237             + "          log(document.createElement('canvas').getContext('webgl'));\n"
238             + "          log(document.createElement('canvas').getContext('experimental-webgl'));\n"
239             + "          log(document.createElement('canvas').getContext('webgl2'));\n"
240             + "          log(document.createElement('canvas').getContext('experimental-webgl2'));\n"
241             + "          log(document.createElement('canvas').getContext('abcdefg'));\n"
242             + "        }\n"
243             + "      }\n"
244             + "    </script>\n"
245             + "  </head>\n"
246             + "  <body onload='test()'></body>\n"
247             + "</html>";
248 
249         loadPageVerifyTitle2(html);
250     }
251 
252     /**
253      * Was throwing exception as of HU 2.18.
254      * @throws Exception if an error occurs
255      */
256     @Test
257     @Alerts("[object CanvasRenderingContext2D]")
258     public void getContextShouldNotThrowForSize0() throws Exception {
259         final String html = DOCTYPE_HTML
260             + "<html><body>\n"
261             + "<canvas id='it' width=0 height=0></canvas>\n"
262             + "<script>\n"
263             + LOG_TITLE_FUNCTION
264             + "var canvas = document.getElementById('it');\n"
265             + "if (canvas.getContext){\n"
266             + "  log(canvas.getContext('2d'));\n"
267             + "}\n"
268             + "</script>\n"
269             + "</body></html>\n";
270 
271         loadPageVerifyTitle2(html);
272     }
273 
274     /**
275      * @throws Exception if an error occurs
276      */
277     @Test
278     @Alerts({"3", "3"})
279     public void getWidthDot() throws Exception {
280         getWidth("3.1");
281     }
282 
283     /**
284      * @throws Exception if an error occurs
285      */
286     @Test
287     @Alerts({"3", "3"})
288     public void getWidthDigitAlpha() throws Exception {
289         getWidth("3a1");
290     }
291 
292     /**
293      * @throws Exception if an error occurs
294      */
295     @Test
296     @Alerts({"300", "150"})
297     public void getWidthAlphaDigit() throws Exception {
298         getWidth("a7");
299     }
300 
301     /**
302      * @throws Exception if an error occurs
303      */
304     @Test
305     @Alerts({"300", "150"})
306     public void getWidthAlpha() throws Exception {
307         getWidth("abb");
308     }
309 
310     private void getWidth(final String value) throws Exception {
311         final String html = DOCTYPE_HTML
312             + "<html>\n"
313             + "  <head>\n"
314             + "    <script>\n"
315             + LOG_TITLE_FUNCTION
316             + "      function test() {\n"
317             + "        var canvas = document.getElementById('myId');\n"
318             + "        log(canvas.width);\n"
319             + "        log(canvas.height);\n"
320             + "      }\n"
321             + "    </script>\n"
322             + "  </head>\n"
323             + "  <body onload='test()'>\n"
324             + "  <canvas id='myId' width='" + value + "' height='" + value + "'></canvas>\n"
325             + "  </body>\n"
326             + "</html>";
327 
328         loadPageVerifyTitle2(html);
329     }
330 }