| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> |
| <title>OffscreenCanvas test: 2d.composite.globalAlpha.image</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/html/canvas/resources/canvas-tests.js"></script> |
| |
| <h1>2d.composite.globalAlpha.image</h1> |
| <p class="desc"></p> |
| |
| |
| <script> |
| var t = async_test(""); |
| var t_pass = t.done.bind(t); |
| var t_fail = t.step_func(function(reason) { |
| throw reason; |
| }); |
| t.step(function() { |
| |
| var offscreenCanvas = new OffscreenCanvas(100, 50); |
| var ctx = offscreenCanvas.getContext('2d'); |
| |
| ctx.fillStyle = '#0f0'; |
| ctx.fillRect(0, 0, 100, 50); |
| ctx.globalAlpha = 0.01; // avoid any potential alpha=0 optimisations |
| var promise = new Promise(function(resolve, reject) { |
| var xhr = new XMLHttpRequest(); |
| xhr.open("GET", '/images/red.png'); |
| xhr.responseType = 'blob'; |
| xhr.send(); |
| xhr.onload = function() { |
| resolve(xhr.response); |
| }; |
| }); |
| promise.then(function(response) { |
| createImageBitmap(response).then(bitmap => { |
| ctx.drawImage(bitmap, 0, 0); |
| _assertPixelApprox(offscreenCanvas, 50,25, 2,253,0,255, "50,25", "2,253,0,255", 2); |
| }, t_fail); |
| }).then(t_pass, t_fail); |
| |
| }); |
| </script> |
