| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| |
| <script> |
| test(function() { |
| var width = 50; |
| var height = 50; |
| var offscreenCanvas1 = new OffscreenCanvas(width, height); |
| var ctx1 = offscreenCanvas1.getContext('2d'); |
| var offscreenCanvas2 = new OffscreenCanvas(width, height); |
| var ctx2 = offscreenCanvas2.getContext('2d'); |
| |
| ctx2.fillStyle = 'rgba(12, 34, 56, 255)'; |
| ctx2.fillRect(0, 0, 10, 10); |
| ctx1.fillStyle = 'rgba(24, 68, 108, 255)'; |
| ctx1.fillRect(0, 0, width, height); |
| ctx1.globalCompositeOperation = 'source-in'; |
| ctx1.drawImage(offscreenCanvas2, 0, 0); |
| |
| var color = ctx1.getImageData(25, 25, 1, 1).data; |
| assert_approx_equals(color[0], 0, 5); |
| assert_approx_equals(color[1], 0, 5); |
| assert_approx_equals(color[2], 0, 5); |
| assert_approx_equals(color[3], 0, 5); |
| |
| color = ctx1.getImageData(5, 5, 1, 1).data; |
| assert_approx_equals(color[0], 12, 5); |
| assert_approx_equals(color[1], 34, 5); |
| assert_approx_equals(color[2], 56, 5); |
| assert_approx_equals(color[3], 255, 5); |
| }, 'Test globalCompositeOperation API on OffscreenCanvas'); |
| |
| </script> |
