| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by tools/gentest.py. --> |
| <title>OffscreenCanvas test: 2d.composite.uncovered.image.copy</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/common/canvas-tests.js"></script> |
| |
| <h1>2d.composite.uncovered.image.copy</h1> |
| <p class="desc">drawImage() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.</p> |
| |
| |
| <script> |
| var t = async_test("drawImage() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged."); |
| t.step(function() { |
| |
| var offscreenCanvas = new OffscreenCanvas(100, 50); |
| var ctx = offscreenCanvas.getContext('2d'); |
| |
| |
| ctx.fillStyle = 'rgba(0, 255, 255, 0.5)'; |
| ctx.fillRect(0, 0, 100, 50); |
| ctx.globalCompositeOperation = 'copy'; |
| var promise = new Promise(function(resolve, reject) { |
| var xhr = new XMLHttpRequest(); |
| xhr.open("GET", '/images/yellow.png'); |
| xhr.responseType = 'blob'; |
| xhr.send(); |
| xhr.onload = function() { |
| resolve(xhr.response); |
| }; |
| }); |
| promise.then(function(response) { |
| ctx.drawImage(response, 40, 40, 10, 10, 40, 50, 10, 10); |
| _assertPixelApprox(offscreenCanvas, 15,15, 0,0,0,0, "15,15", "0,0,0,0", 5); |
| _assertPixelApprox(offscreenCanvas, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 5); |
| }); |
| |
| t.done(); |
| |
| }); |
| </script> |
