2d.imageData.put.modified.html (1164B)
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.modified</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.modified</h1> 10 <p class="desc">putImageData() puts modified image data correctly</p> 11 12 13 <script> 14 var t = async_test("putImageData() puts modified image data correctly"); 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 = '#0f0'; 25 ctx.fillRect(0, 0, 100, 50) 26 ctx.fillStyle = '#f00'; 27 ctx.fillRect(45, 20, 10, 10) 28 var imgdata = ctx.getImageData(45, 20, 10, 10); 29 for (var i = 0, len = imgdata.width*imgdata.height*4; i < len; i += 4) 30 { 31 imgdata.data[i] = 0; 32 imgdata.data[i+1] = 255; 33 } 34 ctx.putImageData(imgdata, 45, 20); 35 _assertPixelApprox(canvas, 50,25, 0,255,0,255, 2); 36 t.done(); 37 38 }); 39 </script>