| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id='output' width='200' height='200'></canvas> |
| <script id='myWorker' type='text/worker'> |
| self.onmessage = function(e) { |
| var aCanvas = new OffscreenCanvas(200, 200); |
| var ctx = aCanvas.getContext('2d'); |
| |
| var radialGrad = ctx.createRadialGradient(100, 100, 100, 100, 100, 0); |
| radialGrad.addColorStop(0, "#fff"); |
| radialGrad.addColorStop(1, "#0f0"); |
| |
| ctx.fillStyle = radialGrad; |
| ctx.fillRect(0, 0, 200, 200); |
| |
| var linearGrad = ctx.createLinearGradient(0, 0, 200, 200); |
| linearGrad.addColorStop(0, "#f00"); |
| linearGrad.addColorStop(1, "#ff0"); |
| |
| ctx.strokeStyle = linearGrad; |
| ctx.lineWidth = "3"; |
| ctx.beginPath(); |
| ctx.moveTo(0, 0); |
| ctx.lineTo(200, 200); |
| ctx.stroke(); |
| |
| 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> |
| |
