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| 1 <!DOCTYPE html> |
| 2 <!-- DO NOT EDIT! This test has been generated by tools/gentest.py. --> |
| 3 <title>OffscreenCanvas test: 2d.composite.globalAlpha.image</title> |
| 4 <script src="/resources/testharness.js"></script> |
| 5 <script src="/resources/testharnessreport.js"></script> |
| 6 <script src="/common/canvas-tests.js"></script> |
| 7 |
| 8 <h1>2d.composite.globalAlpha.image</h1> |
| 9 <p class="desc"></p> |
| 10 |
| 11 |
| 12 <script> |
| 13 var t = async_test(""); |
| 14 t.step(function() { |
| 15 |
| 16 var offscreenCanvas = new OffscreenCanvas(100, 50); |
| 17 var ctx = offscreenCanvas.getContext('2d'); |
| 18 |
| 19 ctx.fillStyle = '#0f0'; |
| 20 ctx.fillRect(0, 0, 100, 50); |
| 21 ctx.globalAlpha = 0.01; // avoid any potential alpha=0 optimisations |
| 22 var promise = new Promise(function(resolve, reject) { |
| 23 var xhr = new XMLHttpRequest(); |
| 24 xhr.open("GET", '/images/red.png'); |
| 25 xhr.responseType = 'blob'; |
| 26 xhr.send(); |
| 27 xhr.onload = function() { |
| 28 resolve(xhr.response); |
| 29 }; |
| 30 }); |
| 31 promise.then(function(response) { |
| 32 ctx.drawImage(response, 0, 0); |
| 33 _assertPixelApprox(offscreenCanvas, 50,25, 2,253,0,255, "50,25", "2,253,0,25
5", 2); |
| 34 }); |
| 35 |
| 36 t.done(); |
| 37 |
| 38 }); |
| 39 </script> |
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