| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // @dart = 2.6 |
| import 'dart:async'; |
| |
| import 'package:test/test.dart'; |
| import 'package:ui/ui.dart' as ui; |
| |
| /// Tests frame timings in a renderer-agnostic way. |
| /// |
| /// See CanvasKit-specific and HTML-specific test files `frame_timings_test.dart`. |
| Future<void> runFrameTimingsTest() async { |
| List<ui.FrameTiming> timings; |
| ui.window.onReportTimings = (List<ui.FrameTiming> data) { |
| timings = data; |
| }; |
| Completer<void> frameDone = Completer<void>(); |
| ui.window.onDrawFrame = () { |
| final ui.SceneBuilder sceneBuilder = ui.SceneBuilder(); |
| sceneBuilder |
| ..pushOffset(0, 0) |
| ..pop(); |
| ui.window.render(sceneBuilder.build()); |
| frameDone.complete(); |
| }; |
| |
| // Frame 1. |
| ui.window.scheduleFrame(); |
| await frameDone.future; |
| expect(timings, isNull, reason: '100 ms hasn\'t passed yet'); |
| await Future<void>.delayed(const Duration(milliseconds: 150)); |
| |
| // Frame 2. |
| frameDone = Completer<void>(); |
| ui.window.scheduleFrame(); |
| await frameDone.future; |
| expect(timings, hasLength(2), reason: '100 ms passed. 2 frames pumped.'); |
| for (final ui.FrameTiming timing in timings) { |
| expect(timing.vsyncOverhead, greaterThanOrEqualTo(Duration.zero)); |
| expect(timing.buildDuration, greaterThanOrEqualTo(Duration.zero)); |
| expect(timing.rasterDuration, greaterThanOrEqualTo(Duration.zero)); |
| expect(timing.totalSpan, greaterThanOrEqualTo(Duration.zero)); |
| } |
| } |