| // Copyright 2022 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| (async function(testRunner) { |
| const {page, dp} = await testRunner.startWithFrameControl( |
| 'Tests screenshot produced by beginFrame honors optimizeForSpeed param'); |
| |
| await dp.Runtime.enable(); |
| await dp.HeadlessExperimental.enable(); |
| |
| const RendererTestHelper = |
| await testRunner.loadScript('../helpers/renderer-test-helper.js'); |
| const {httpInterceptor, frameNavigationHelper, virtualTimeController} = |
| await (new RendererTestHelper(testRunner, dp, page)).init(); |
| |
| httpInterceptor.addResponse(`http://example.com/`, `<!doctype html> |
| <html><body>Hello world</body></html> |
| `); |
| |
| await virtualTimeController.initialize(100); |
| await frameNavigationHelper.navigate('http://example.com/'); |
| await virtualTimeController.grantTime(500); |
| |
| let frameTimeOffset = 0; |
| async function takeScreenshot(optimizeForSpeed) { |
| return (await dp.HeadlessExperimental.beginFrame({ |
| frameTimeTicks: |
| virtualTimeController.currentFrameTime() + frameTimeOffset++, |
| screenshot: {format: 'png', optimizeForSpeed} |
| })) |
| .result.screenshotData; |
| } |
| |
| const slow = await takeScreenshot(false); |
| const fast = await takeScreenshot(true); |
| |
| testRunner.log( |
| slow.length < fast.length ? |
| 'PASSED: slowly-encoded PNG is smaller that fast-encoded' : |
| `FAILED: ${slow.length} >= ${fast.length}}`); |
| testRunner.completeTest(); |
| }) |
