| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <canvas style="background: red"></canvas> |
| <script> |
| |
| test(function() { |
| var canvas = document.querySelector('canvas'); |
| var offscreenCtx = (new OffscreenCanvas(canvas.width, canvas.height)).getContext('2d'); |
| |
| var imageData = offscreenCtx.createImageData(canvas.width, canvas.height); |
| var data = imageData.data; |
| |
| // Set all pixels to [0, 255, 0, 255] |
| for (var i = 0; i < data.length; i += 4) { |
| data[i + 1] = data[i + 3] = 255; |
| } |
| |
| offscreenCtx.putImageData(imageData, 0, 0); |
| |
| assert_array_equals(offscreenCtx.getImageData(0, 0, 1, 1).data, [0, 255, 0, 255]); |
| }, "Verify that imageData is properly set"); |
| |
| </script> |
