| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id='output' width='100' height='100'></canvas> |
| |
| <script id='myWorker' type='text/worker'> |
| self.onmessage = function(e) { |
| var aCanvas = new OffscreenCanvas(100, 100); |
| var ctx = aCanvas.getContext('2d'); |
| ctx.strokeStyle = 'green'; |
| ctx.strokeRect(25, 25, 50, 50); |
| var image = aCanvas.transferToImageBitmap(); |
| self.postMessage(image, [image]); |
| }; |
| </script> |
| |
| <script> |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| } |
| var blob = new Blob([document.getElementById('myWorker').textContent]); |
| var worker = new Worker(URL.createObjectURL(blob)); |
| worker.addEventListener('message', msg => { |
| var outputCtx = document.getElementById('output').getContext('bitmaprenderer'); |
| outputCtx.transferFromImageBitmap(msg.data); |
| if (window.testRunner) { |
| testRunner.notifyDone(); |
| } |
| }); |
| worker.postMessage(""); |
| </script> |
| </body> |
| </html> |
