x-fastscreenshot

node.js module for fast screenshots on the X window system via XShm 📷⚡

Most of the code is from sylvain121/node-X11 + proper rgb conversion. There is only Image Buffer output for it be as simple as possible so for writing to a file you will need to add another module.

Example with file output

npm i --save x-fastscreenshot

const fastscreenshot = require('x-fastscreenshot');
const jimp = require('jimp');
fastscreenshot.init();

fastscreenshot.getImage((err, image){
  if(err) throw err;
  jimp.read({width: image.width, height: image.height, data: image.data}).then(img => {
    return img.write('output.png');
  });
});

Speed

Taking a picture on a single 1080p screen setup takes around 16ms according to my benchmark

const fastscreenshot = require("x-fastscreenshot");
fastscreenshot.init();

console.time("img");
fastscreenshot.getImage((err, image) => {
    console.timeEnd("img");
});

XShm extention version 1.2 with shared pixmaps
X-Window-init: dimension: 1920x1080x24 @ 0/1
img: 15.996ms