| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id='output' width='300' height='300'></canvas> |
| <script id='myWorker' type='text/worker'> |
| self.onmessage = function(e) { |
| var aCanvas = new OffscreenCanvas(300, 300); |
| var ctx = aCanvas.getContext('2d'); |
| |
| ctx.shadowBlur = 5; |
| ctx.shadowColor = "black"; |
| for (var i = 0; i < 6; i++) { |
| for (var j = 0; j < 6; j++) { |
| ctx.save(); |
| ctx.fillStyle = 'rgb(' + (51 * i) + ',' + (255 - 51 * i) + ',255)'; |
| ctx.shadowOffsetY = 2 + i; |
| ctx.shadowOffsetX = 2 + j; |
| ctx.translate(10 + j * 50, 10 + i * 50); |
| ctx.fillRect(0, 0, 25, 25); |
| ctx.restore(); |
| } |
| } |
| |
| 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.transferImageBitmap(msg.data); |
| if (window.testRunner) { |
| testRunner.notifyDone(); |
| } |
| }); |
| worker.postMessage(""); |
| </script> |
| </body> |
| </html> |
