2d.imageData.object.clamp.html (1848B)
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.clamp</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.clamp</h1> 10 <p class="desc">ImageData.data clamps numbers to [0, 255]</p> 11 12 13 <script> 14 var t = async_test("ImageData.data clamps numbers to [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 var imgdata = ctx.getImageData(0, 0, 10, 10); 25 26 imgdata.data[0] = 100; 27 imgdata.data[0] = 300; 28 _assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255"); 29 imgdata.data[0] = 100; 30 imgdata.data[0] = -100; 31 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 32 33 imgdata.data[0] = 100; 34 imgdata.data[0] = 200+Math.pow(2, 32); 35 _assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255"); 36 imgdata.data[0] = 100; 37 imgdata.data[0] = -200-Math.pow(2, 32); 38 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 39 40 imgdata.data[0] = 100; 41 imgdata.data[0] = Math.pow(10, 39); 42 _assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255"); 43 imgdata.data[0] = 100; 44 imgdata.data[0] = -Math.pow(10, 39); 45 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 46 47 imgdata.data[0] = 100; 48 imgdata.data[0] = -Infinity; 49 _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); 50 imgdata.data[0] = 100; 51 imgdata.data[0] = Infinity; 52 _assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255"); 53 t.done(); 54 55 }); 56 </script>