2d.imageData.object.round.html (2168B)
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.round</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.round</h1> 10 <p class="desc">ImageData.data rounds numbers with round-to-zero</p> 11 12 13 <script> 14 var t = async_test("ImageData.data rounds numbers with round-to-zero"); 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 imgdata.data[0] = 0.499; 26 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 27 imgdata.data[0] = 0.5; 28 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 29 imgdata.data[0] = 0.501; 30 _assertSame(imgdata.data[0], 1, "imgdata.data[\""+(0)+"\"]", "1"); 31 imgdata.data[0] = 1.499; 32 _assertSame(imgdata.data[0], 1, "imgdata.data[\""+(0)+"\"]", "1"); 33 imgdata.data[0] = 1.5; 34 _assertSame(imgdata.data[0], 2, "imgdata.data[\""+(0)+"\"]", "2"); 35 imgdata.data[0] = 1.501; 36 _assertSame(imgdata.data[0], 2, "imgdata.data[\""+(0)+"\"]", "2"); 37 imgdata.data[0] = 2.5; 38 _assertSame(imgdata.data[0], 2, "imgdata.data[\""+(0)+"\"]", "2"); 39 imgdata.data[0] = 3.5; 40 _assertSame(imgdata.data[0], 4, "imgdata.data[\""+(0)+"\"]", "4"); 41 imgdata.data[0] = 252.5; 42 _assertSame(imgdata.data[0], 252, "imgdata.data[\""+(0)+"\"]", "252"); 43 imgdata.data[0] = 253.5; 44 _assertSame(imgdata.data[0], 254, "imgdata.data[\""+(0)+"\"]", "254"); 45 imgdata.data[0] = 254.5; 46 _assertSame(imgdata.data[0], 254, "imgdata.data[\""+(0)+"\"]", "254"); 47 imgdata.data[0] = 256.5; 48 _assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255"); 49 imgdata.data[0] = -0.5; 50 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 51 imgdata.data[0] = -1.5; 52 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 53 t.done(); 54 55 }); 56 </script>