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Test Info:
/* Any copyright is dedicated to the Public Domain.
"use strict";
const PAGE_MARKUP = `
<html>
<head>
<style>
body {
background-color: rgb(0, 255, 0);
margin: 0;
}
div {
background-color: rgb(255, 0, 0);
height: 100vh;
width: 100vw;
margin-top: 100vh;
}
</style>
</head>
<body>
<div id="bigredblock"></div>
</body>
</html>
`;
const PAGE_URL = BUILDER_URL + encodeURI(PAGE_MARKUP);
/**
* These tests ensure that it's possible to capture the full viewport of
* a browser, and not just the top region.
*/
add_task(async function thumbnails_fullViewport_capture() {
// Create a tab with a green background.
await BrowserTestUtils.withNewTab(
{
gBrowser,
url: PAGE_URL,
},
async browser => {
let canvas = PageThumbs.createCanvas(window);
await PageThumbs.captureToCanvas(browser, canvas, {
fullViewport: true,
});
// The red region isn't scrolled in yet, so we should get
// a green thumbnail.
let ctx = canvas.getContext("2d");
let [r, g, b] = ctx.getImageData(0, 0, 1, 1).data;
Assert.equal(r, 0, "No red channel");
Assert.equal(g, 255, "Full green channel");
Assert.equal(b, 0, "No blue channel");
// Now scroll the red region into view.
await SpecialPowers.spawn(browser, [], () => {
let redblock = content.document.getElementById("bigredblock");
redblock.scrollIntoView(true);
});
await PageThumbs.captureToCanvas(browser, canvas, {
fullViewport: true,
});
// The captured region should be red.
ctx = canvas.getContext("2d");
[r, g, b] = ctx.getImageData(0, 0, 1, 1).data;
Assert.equal(r, 255, "Full red channel");
Assert.equal(g, 0, "No green channel");
Assert.equal(b, 0, "No blue channel");
}
);
});