forked from mirrors/gecko-dev
9c24959520
I've confirmed the mochitest passes with this change, fails without this change on Windows in our CIs. Differential Revision: https://phabricator.services.mozilla.com/D155947
86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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"use strict";
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const PAGECONTENT =
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"<!DOCTYPE html>" +
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"<html>" +
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"<style>" +
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"html { height: 100vh; }" +
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"</style>" +
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"</html>";
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const pageUrl = "data:text/html," + encodeURIComponent(PAGECONTENT);
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add_task(async function test() {
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SpecialPowers.DOMWindowUtils.setHiDPIMode(true);
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registerCleanupFunction(() => {
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SpecialPowers.DOMWindowUtils.restoreHiDPIMode();
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});
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const tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageUrl);
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// Enter fullscreen.
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let fullscreenChangePromise = BrowserTestUtils.waitForContentEvent(
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tab.linkedBrowser,
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"fullscreenchange"
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);
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await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
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content.document.documentElement.requestFullscreen();
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});
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await fullscreenChangePromise;
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let [originalInnerWidth, originalInnerHeight] = await SpecialPowers.spawn(
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tab.linkedBrowser,
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[],
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() => {
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return [content.window.innerWidth, content.window.innerHeight];
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}
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);
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// Then change the DPI.
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let originalPixelRatio = await SpecialPowers.spawn(
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tab.linkedBrowser,
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[],
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() => {
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return content.window.devicePixelRatio;
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}
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);
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let dpiChangedPromise = TestUtils.waitForCondition(async () => {
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let pixelRatio = await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
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return content.window.devicePixelRatio;
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});
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return pixelRatio != originalPixelRatio;
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}, "Make sure the DPI changed");
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SpecialPowers.DOMWindowUtils.setHiDPIMode(false);
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await dpiChangedPromise;
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let [innerWidth, innerHeight] = await SpecialPowers.spawn(
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tab.linkedBrowser,
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[],
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() => {
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return [content.window.innerWidth, content.window.innerHeight];
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}
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);
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ok(
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originalInnerWidth < innerWidth,
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"window.innerWidth on a lower DPI should be greater than the original"
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);
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ok(
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originalInnerHeight < innerHeight,
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"window.innerHeight on a lower DPI should be greater than the original"
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);
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fullscreenChangePromise = BrowserTestUtils.waitForContentEvent(
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tab.linkedBrowser,
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"fullscreenchange"
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);
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await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
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content.document.exitFullscreen();
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});
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await fullscreenChangePromise;
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BrowserTestUtils.removeTab(tab);
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});
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