| /* |
| * Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @description Tests to ensure correct behaviour of canvas loss and |
| * restoration when size is extremely large then, restored to a reasonable |
| * value. |
| * @note no CanvasRenderingContext2D.isContextLost() |
| * @note setting width,height to googol does not seem to make sense for dart |
| */ |
| import "dart:html"; |
| import "dart:math" as Math; |
| import "../../testcommon.dart"; |
| import "../../../Utils/async_utils.dart"; |
| |
| main() { |
| var ctx, lostEventHasFired; |
| |
| verifyContextLost(shouldBeLost) { |
| // Verify context loss experimentally as well as isContextLost() |
| ctx.fillStyle = '#0f0'; |
| ctx.fillRect(0, 0, 1, 1); |
| var contextLostTest = ctx.getImageData(0, 0, 1, 1).data[1] == 0; |
| if (shouldBeLost) { |
| shouldBeTrue(contextLostTest); |
| //shouldBeTrue(ctx.isContextLost()); |
| } else { |
| shouldBeFalse(contextLostTest); |
| //shouldBeFalse(ctx.isContextLost()); |
| } |
| } |
| |
| contextLost(_) { |
| if (lostEventHasFired) { |
| testFailed('Context lost event was dispatched more than once.'); |
| } else { |
| testPassed('Graphics context lost event dispatched.'); |
| } |
| lostEventHasFired = true; |
| verifyContextLost(true); |
| } |
| |
| contextRestored(_) { |
| if (lostEventHasFired) { |
| testPassed('Context restored event dispatched after context lost.'); |
| } else { |
| testFailed('Context restored event was dispatched before a context lost event.'); |
| } |
| verifyContextLost(false); |
| asyncEnd(); |
| } |
| |
| var canvas = document.createElement('canvas'); |
| canvas.addEventListener('contextlost', contextLost); |
| canvas.addEventListener('contextrestored', contextRestored); |
| ctx = canvas.getContext('2d'); |
| lostEventHasFired = false; |
| verifyContextLost(false); |
| |
| var googol = Math.pow(10,100); |
| //var bigValue = googol; |
| var bigValue = Math.pow(10,8); |
| canvas.width = bigValue; |
| canvas.height = bigValue; |
| verifyContextLost(true); |
| canvas.width = bigValue; |
| verifyContextLost(true); |
| canvas.width = 100; |
| canvas.height = 100; |
| verifyContextLost(true); // Restoration is async. |
| asyncStart(); |
| } |