2d.imageData.get.range.html (1128B)
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.get.range</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.get.range</h1> 10 <p class="desc">getImageData() returns values in the range [0, 255]</p> 11 12 13 <script> 14 var t = async_test("getImageData() returns values in the range [0, 255]"); 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 ctx.fillStyle = '#000'; 25 ctx.fillRect(0, 0, 100, 50); 26 ctx.fillStyle = '#fff'; 27 ctx.fillRect(20, 10, 60, 10); 28 var imgdata1 = ctx.getImageData(10, 5, 1, 1); 29 _assertSame(imgdata1.data[0], 0, "imgdata1.data[\""+(0)+"\"]", "0"); 30 var imgdata2 = ctx.getImageData(30, 15, 1, 1); 31 _assertSame(imgdata2.data[0], 255, "imgdata2.data[\""+(0)+"\"]", "255"); 32 t.done(); 33 34 }); 35 </script>