| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script> |
| // This test aims to ensure that OffscreenCanvas.commit() does not |
| // crash for a placeholder canvas under frameless document. |
| // Since the document is invisible, the resultant image should be |
| // not visible too. But users must be able to draw to the OffscreenCanvas |
| // and do canvas-operations on the frameless placeholder canvas. |
| // TODO(crbug.com/683172): Modify this test after handling for |
| // frameless canvas is done. |
| function createFramelessCanvas() { |
| var framelessDoc = document.implementation.createHTMLDocument("frameless"); |
| var canvas = framelessDoc.createElement("canvas"); |
| canvas.width = 50; |
| canvas.height = 50; |
| return canvas; |
| } |
| |
| function transferControlAndCommit(canvas) { |
| var offscreenCanvas = canvas.transferControlToOffscreen(); |
| var ctx = offscreenCanvas.getContext("2d"); |
| ctx.fillStyle = "blue"; |
| ctx.fillRect(0, 0, 50, 50); |
| ctx.commit(); |
| return offscreenCanvas; |
| } |
| |
| test(function() { |
| var offscreenCanvas = transferControlAndCommit(createFramelessCanvas()); |
| var ctx = offscreenCanvas.getContext("2d"); |
| var pixels = ctx.getImageData(0, 0, 1, 1).data; |
| assert_array_equals(pixels, [0, 0, 255, 255]); |
| }, "Verify that the getImageData() works on the OffscreenCanvas context of a frameless canvas"); |
| |
| async_test(function(t) { |
| var canvas = createFramelessCanvas(); |
| var offscreenCanvas = transferControlAndCommit(canvas); |
| |
| var c = document.createElement("canvas"); |
| c.width = 50; |
| c.height = 50; |
| var ctx2 = c.getContext("2d"); |
| setTimeout(function() { |
| ctx2.drawImage(canvas, 0, 0); |
| var pixels = ctx2.getImageData(0, 0, 1, 1).data; |
| t.step(function() { |
| assert_array_equals(pixels, [0, 0, 255, 255]); |
| }); |
| t.done(); |
| }, 0); |
| }, "Verify that the placeholder canvas can be used as an image source"); |
| </script> |
