31 lines
940 B
JavaScript
31 lines
940 B
JavaScript
// ==UserScript==
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// @name YouTube screenshotter
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// @version 3
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// @grant none
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// @match https://www.youtube.com/*
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// @run-at document-end
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// ==/UserScript==
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(() => {
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'use strict';
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function main() {
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window.__userscript__takeScreenshot = function (video, imageType = 'image/png') {
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if (!(video instanceof HTMLVideoElement)) {
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throw new Error('Assertion failed: video instanceof HTMLVideoElement');
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}
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let canvas = document.createElement('canvas');
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canvas.width = video.videoWidth;
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canvas.height = video.videoHeight;
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let ctx = canvas.getContext('2d');
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ctx.drawImage(video, 0, 0, video.videoWidth, video.videoHeight);
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window.open(canvas.toDataURL(imageType), '_blank');
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};
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}
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let script = document.createElement('script');
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script.append(`(${main.toString()})();`);
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(document.body || document.head || document.documentElement).appendChild(script);
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})();
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