blob: 18e18b2d2de198135e2b320b47271151004250f1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const EXPORTED_SYMBOLS = ["ScreenshotChild"];
class ScreenshotChild extends JSWindowActorChild {
receiveMessage(message) {
if (message.name == "TakeScreenshot") {
return this.takeScreenshot(message.data);
}
return null;
}
async takeScreenshot(params) {
if (this.document.readyState != "complete") {
await new Promise(resolve =>
this.contentWindow.addEventListener("load", resolve, { once: true })
);
}
let { fullWidth, fullHeight } = params;
let { contentWindow } = this;
let canvas = contentWindow.document.createElementNS(
"http://www.w3.org/1999/xhtml",
"html:canvas"
);
let context = canvas.getContext("2d");
let width = contentWindow.innerWidth;
let height = contentWindow.innerHeight;
if (fullWidth) {
width += contentWindow.scrollMaxX - contentWindow.scrollMinX;
}
if (fullHeight) {
height += contentWindow.scrollMaxY - contentWindow.scrollMinY;
}
canvas.width = width;
canvas.height = height;
context.drawWindow(
contentWindow,
0,
0,
width,
height,
"rgb(255, 255, 255)"
);
return new Promise(resolve => canvas.toBlob(resolve));
}
}
|
