Add a test of screenshot with overridden device scale factor

This is a regression test for issue 1164610. Bug: 1164610 Change-Id: I1671fadf581778ddd2d90c310c1574a91ecdd967 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621962 Commit-Queue: Andrey Kosyakov <caseq@chromium.org> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org> Cr-Commit-Position: refs/heads/master@{#842201}

Add a test of screenshot with overridden device scale factor
This is a regression test for issue 1164610. Bug: 1164610 Change-Id: I1671fadf581778ddd2d90c310c1574a91ecdd967 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621962 Commit-Queue: Andrey Kosyakov <caseq@chromium.org> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org> Cr-Commit-Position: refs/heads/master@{#842201}
daba3262 · Andrey Kosyakov · Chromium LUCI CQ · 6cf2df89 · daba3262 · daba3262
Commit daba3262 authored Jan 11, 2021 by Andrey Kosyakov Committed by Chromium LUCI CQ Jan 11, 2021
3 changed files
--- a/headless/test/data/protocol/emulation/screenshot-device-scale-factor-expected.txt
+++ b/headless/test/data/protocol/emulation/screenshot-device-scale-factor-expected.txt
+Tests screenshot with overridden device scale factor
+requested url: http://example.com/
+Screenshot size: 200 x 200
+rgba @(175,175) 0,0,255,255
\ No newline at end of file
--- a/headless/test/data/protocol/emulation/screenshot-device-scale-factor.js
+++ b/headless/test/data/protocol/emulation/screenshot-device-scale-factor.js
+// Copyright 2021 The Chromium Authors. All rights reserved.
+// 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, session, dp} = await testRunner.startWithFrameControl(
+      'Tests screenshot with overridden device scale factor');
+
+  await dp.Runtime.enable();
+  await dp.HeadlessExperimental.enable();
+
+  dp.Emulation.enable();
+  await dp.Emulation.setDeviceMetricsOverride({
+      deviceScaleFactor: 2,
+      width: 100,
+      height: 100,
+      screenHeight: 100,
+      screenWidth: 100,
+      mobile: true,
+      viewport: {x: 0, y: 0, width: 100, height: 100, scale: 1}
+  });
+
+  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>
+      <meta name=viewport content="width=device-width">
+      <style>
+        html, body { width: 100%; height: 100%; margin:0; padding:0; }
+        div {
+          width: 100%; height: 100%; margin:0; padding:0;
+          background-size: 100% 100%;
+          background-color: blue;
+        }
+      </style>
+      <body>
+        <div></div>
+      </body>
+      </html>
+  `);
+
+  let ctx = await new Promise(async fulfill => {
+    await virtualTimeController.grantInitialTime(500, 100,
+        null,
+        async () => fulfill(await virtualTimeController.captureScreenshot())
+    );
+    frameNavigationHelper.navigate('http://example.com/');
+  });
+  // We use a screen and viewport of 100x100 DIP, which is 200 physical pixels
+  // due to deviceScaleFactor of 2. Make sure the screenshot is not clipped.
+  let rgba = ctx.getImageData(175, 175, 1, 1).data;
+  testRunner.log(`rgba @(175,175) ${rgba}`);
+  testRunner.completeTest();
+})
\ No newline at end of file
--- a/headless/test/headless_compositor_browsertest.cc
+++ b/headless/test/headless_compositor_browsertest.cc
@@ -157,5 +157,7 @@ HEADLESS_COMPOSITOR_TEST(RendererOpacityAnimation,
                         "sanity/renderer-opacity-animation.js")
 HEADLESS_COMPOSITOR_TEST(ScreenshotAfterMetricsOverride,
                         "sanity/screenshot-after-metrics-override.js")
+HEADLESS_COMPOSITOR_TEST(ScreenshotDeviceScaleFactor,
+                         "emulation/screenshot-device-scale-factor.js")

 }  // namespace headless