2d.imageData.object.readonly.html (1411B)
1 <!DOCTYPE html> 2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> 3 <meta charset="UTF-8"> 4 <title>OffscreenCanvas test: 2d.imageData.object.readonly</title> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/html/canvas/resources/canvas-tests.js"></script> 8 9 <h1>2d.imageData.object.readonly</h1> 10 <p class="desc">ImageData objects properties are read-only</p> 11 12 13 <script> 14 var t = async_test("ImageData objects properties are read-only"); 15 var t_pass = t.done.bind(t); 16 var t_fail = t.step_func(function(reason) { 17 throw reason; 18 }); 19 t.step(function() { 20 21 var canvas = new OffscreenCanvas(100, 50); 22 var ctx = canvas.getContext('2d'); 23 24 var imgdata = ctx.getImageData(0, 0, 10, 10); 25 var w = imgdata.width; 26 var h = imgdata.height; 27 var d = imgdata.data; 28 imgdata.width = 123; 29 imgdata.height = 123; 30 imgdata.data = [100,100,100,100]; 31 _assertSame(imgdata.width, w, "imgdata.width", "w"); 32 _assertSame(imgdata.height, h, "imgdata.height", "h"); 33 _assertSame(imgdata.data, d, "imgdata.data", "d"); 34 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 35 _assertSame(imgdata.data[1], 0, "imgdata.data[\""+(1)+"\"]", "0"); 36 _assertSame(imgdata.data[2], 0, "imgdata.data[\""+(2)+"\"]", "0"); 37 _assertSame(imgdata.data[3], 0, "imgdata.data[\""+(3)+"\"]", "0"); 38 t.done(); 39 40 }); 41 </script>