2d.imageData.put.unchanged.html (1462B)
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.put.unchanged</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.put.unchanged</h1> 10 <p class="desc">putImageData(getImageData(...), ...) has no effect</p> 11 12 13 <script> 14 var t = async_test("putImageData(getImageData(...), ...) has no effect"); 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 i = 0; 25 for (var y = 0; y < 16; ++y) { 26 for (var x = 0; x < 16; ++x, ++i) { 27 ctx.fillStyle = 'rgba(' + i + ',' + (Math.floor(i*1.5) % 256) + ',' + (Math.floor(i*23.3) % 256) + ',' + (i/256) + ')'; 28 ctx.fillRect(x, y, 1, 1); 29 } 30 } 31 var imgdata1 = ctx.getImageData(0.1, 0.2, 15.8, 15.9); 32 var olddata = []; 33 for (var i = 0; i < imgdata1.data.length; ++i) 34 olddata[i] = imgdata1.data[i]; 35 36 ctx.putImageData(imgdata1, 0.1, 0.2); 37 38 var imgdata2 = ctx.getImageData(0.1, 0.2, 15.8, 15.9); 39 for (var i = 0; i < imgdata2.data.length; ++i) { 40 _assertSame(olddata[i], imgdata2.data[i], "olddata[\""+(i)+"\"]", "imgdata2.data[\""+(i)+"\"]"); 41 } 42 t.done(); 43 44 }); 45 </script>