| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> |
| <title>OffscreenCanvas test: 2d.layer.malformed-operations.drawImage</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/html/canvas/resources/canvas-tests.js"></script> |
| |
| <h1>2d.layer.malformed-operations.drawImage</h1> |
| <p class="desc">Check that exceptions are thrown for operations that are malformed while layers are open.</p> |
| |
| |
| <script> |
| test(t => { |
| var canvas = new OffscreenCanvas(200, 200); |
| var ctx = canvas.getContext('2d'); |
| |
| const canvas2 = new OffscreenCanvas(200, 200); |
| const ctx2 = canvas2.getContext('2d'); |
| // Shouldn't throw on its own. |
| ctx2.drawImage(canvas, 0, 0); |
| // Make sure the exception isn't caused by calling the function twice. |
| ctx2.drawImage(canvas, 0, 0); |
| // Calling again inside a layer should throw. |
| ctx.beginLayer(); |
| assert_throws_dom("InvalidStateError", |
| () => ctx2.drawImage(canvas, 0, 0)); |
| |
| }, "Check that exceptions are thrown for operations that are malformed while layers are open."); |
| </script> |
