| <!doctype html> |
| <html> |
| <head> |
| <title>Test if the users can change Image Rendering Quality in Offscreen Canvas</title> |
| <style type="text/css"> |
| #can { |
| width: 500px; |
| height: 500px; |
| image-rendering: pixelated; |
| } |
| </style> |
| </head> |
| <body> |
| <canvas id="can" width="50" height="50"></canvas> |
| <script> |
| const c2 = document.getElementById("can"); |
| const offscreen_canvas = c2.transferControlToOffscreen(); |
| const ctx_o = offscreen_canvas.getContext('2d'); |
| |
| c2.style.imageRendering = "auto"; |
| |
| ctx_o.clearRect(0, 0, 50, 50); |
| ctx_o.fillRect(10, 10, 30, 30); |
| |
| function waitForCanvasToDraw() { |
| return new Promise(resolve => { |
| const testPixel = function() { |
| const d = ctx_o.getImageData(20, 20, 1, 1); |
| if (d.data[0] == 0 && d.data[3] == 255) { |
| setTimeout(resolve, 2000); |
| } else { |
| requestAnimationFrame(testPixel); |
| } |
| } |
| testPixel(); |
| }) |
| } |
| |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| } |
| waitForCanvasToDraw().then(() => { |
| if (window.testRunner) { |
| testRunner.notifyDone(); |
| } |
| }).catch(err => { |
| testRunner.notifyDone(); |
| throw err; |
| }); |
| |
| </script> |
| </body> |
| </html> |
