2d.composite.uncovered.nocontext.destination-atop.worker.js (1031B)
1 // DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. 2 // OffscreenCanvas test in a worker:2d.composite.uncovered.nocontext.destination-atop 3 // Description:drawImage() of a canvas with no context draws pixels as (0,0,0,0), and does not leave the pixels unchanged. 4 // Note: 5 6 importScripts("/resources/testharness.js"); 7 importScripts("/html/canvas/resources/canvas-tests.js"); 8 9 var t = async_test("drawImage() of a canvas with no context draws pixels as (0,0,0,0), and does not leave the pixels unchanged."); 10 var t_pass = t.done.bind(t); 11 var t_fail = t.step_func(function(reason) { 12 throw reason; 13 }); 14 t.step(function() { 15 16 var canvas = new OffscreenCanvas(100, 50); 17 var ctx = canvas.getContext('2d'); 18 19 ctx.fillStyle = 'rgba(0, 255, 255, 0.5)'; 20 ctx.fillRect(0, 0, 100, 50); 21 ctx.globalCompositeOperation = 'destination-atop'; 22 const canvas2 = new OffscreenCanvas(canvas.width, canvas.height); 23 ctx.drawImage(canvas2, 0, 0); 24 _assertPixelApprox(canvas, 50,25, 0,0,0,0, 5); 25 t.done(); 26 }); 27 done();