| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script> |
| promise_test( |
| t => { return zeroSizeReadback("width", "none", t); }, |
| "Verify convertToBlob on a 0 width OffscreenCanvas with no context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("width", "2d", t); }, |
| "Verify convertToBlob and getImageData on a 0 width OffscreenCanvas with a 2d context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("width", "webgl", t); }, |
| "Verify convertToBlob on a 0 width OffscreenCanvas with a webgl context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("width", "webgl2", t); }, |
| "Verify convertToBlob on a 0 width OffscreenCanvas with a webgl2 context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("height", "none", t); }, |
| "Verify convertToBlob on a 0 height OffscreenCanvas with no context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("height", "2d", t); }, |
| "Verify convertToBlob and getImageData on a 0 height OffscreenCanvas with a 2d context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("height", "webgl", t); }, |
| "Verify convertToBlob on a 0 height OffscreenCanvas with a webgl context." |
| ); |
| |
| promise_test( |
| t => { return zeroSizeReadback("height", "webgl2", t); }, |
| "Verify convertToBlob on a 0 height OffscreenCanvas with a webgl2 context." |
| ); |
| |
| function zeroSizeReadback(zeroDimension, contextType, t) { |
| var offscreen = new OffscreenCanvas(10, 10); |
| eval("offscreen." + zeroDimension + " = 0"); |
| // Verify that one of the dimensions was indeed zeroed. |
| assert_equals(offscreen.width * offscreen.height, 0); |
| |
| var ctx; |
| if (contextType != "none") { |
| ctx = offscreen.getContext(contextType); |
| } |
| |
| if (contextType == '2d') { |
| var imgdata = ctx.getImageData(0, 0, 1, 1); |
| assert_equals(imgdata.width, 1); |
| assert_equals(imgdata.height, 1); |
| } |
| |
| return promise_rejects(t, new DOMException('', 'IndexSizeError'), offscreen.convertToBlob()); |
| } |
| </script> |
