| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by tools/gentest.py. --> |
| <title>OffscreenCanvas test: 2d.imageData.create2.large</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/2dcontext/resources/canvas-tests.js"></script> |
| |
| <h1>2d.imageData.create2.large</h1> |
| <p class="desc">createImageData(sw, sh) works for sizes much larger than the canvas</p> |
| |
| |
| <script> |
| var t = async_test("createImageData(sw, sh) works for sizes much larger than the canvas"); |
| t.step(function() { |
| |
| var offscreenCanvas = new OffscreenCanvas(100, 50); |
| var ctx = offscreenCanvas.getContext('2d'); |
| |
| var imgdata = ctx.createImageData(1000, 2000); |
| _assertSame(imgdata.data.length, imgdata.width*imgdata.height*4, "imgdata.data.length", "imgdata.width*imgdata.height*4"); |
| _assert(imgdata.width < imgdata.height, "imgdata.width < imgdata.height"); |
| _assert(imgdata.width > 0, "imgdata.width > 0"); |
| var isTransparentBlack = true; |
| for (var i = 0; i < imgdata.data.length; i += 7813) // check ~1024 points (assuming normal scaling) |
| if (imgdata.data[i] !== 0) |
| isTransparentBlack = false; |
| _assert(isTransparentBlack, "isTransparentBlack"); |
| |
| t.done(); |
| |
| }); |
| </script> |
