@cyyynthia/x11-wallpaper v0.2.1

x11-wallpaper

A small NodeJS (ESM only) utility wrapper around node-x11 to read/write the desktop wallpaper on x11.

Installation

[npm | yarn | pnpm] install @cyyynthia/x11-wallpaper

Usage

This library uses the _XROOTPMAP_ID and ESETROOT_PMAP_ID attributes. It sets them appropriately when updating the wallpaper, which should ensure compatibility with most other tools.

These examples use sharp to transform the raw pixel data into images and vice-versa. This library only speaks raw 3 channels RGB buffers.

Get current wallpaper

import sharp from 'sharp'
import { getWallpaper } from '@cyyynthia/x11-wallpaper'

const wallpaper = await getWallpaper()
await sharp(wallpaper.data, {
  raw: {
    width: wallpaper.width,
    height: wallpaper.height,
    channels: 3,
  }
}).png().toFile('./output.png')

Set wallpaper

import sharp from 'sharp'
import { getWallpaper } from '@cyyynthia/x11-wallpaper'

const image = await sharp('./cute-cat.png')
  .resize(1920, 1080)
  .removeAlpha()
  .raw()
  .toBuffer()

await setWallpaper({
  width: 1920,
  height: 1080,
  data: image,
})

Get screen configuration

This is a helper method to get the physical screen layout on the X screen. This is useful for multi-screen configurations, as this library doesn't handle it for you.

import { getScreens } from '@cyyynthia/x11-wallpaper'

const screens = await getScreens()
console.log(screens) // Output of type `ScreenConfig` - See the index.d.ts for more details.

Multi-screen example usage

Set a wallpaper per-screen

import sharp from 'sharp'
import { getScreens, setWallpaper } from '../src/index.js'

// Retrieve screen congfiguration
const screens = await getScreens()

// Create the image
const img = sharp({
  create: {
    width: screens.width,
    height: screens.height,
    channels: 3,
    background: '#000',
  },
})

// Load our wallpapers
const WALLPAPER_PATHS = { outputName: '...', ... } // Output name is the name of the screen (e.g. "DP-0" or "HDMI-0")
const layers = []
for (const screen of screens.screens) {
  layers.push({
    input: await sharp(WALLPAPER_PATHS[screen.output]).resize(screen.width, screen.height).toBuffer(),
    top: screen.y,
    left: screen.x,
  })
}

await setWallpaper({
  width: screens.width,
  height: screens.height,
  data: await img.composite(layers).removeAlpha().raw().toBuffer(),
})

Get per-screen wallpapers

import sharp from 'sharp'
import { getScreens, getWallpaper } from '../src/index.js'

// Retrieve screen congfiguration
const screens = await getScreens()

// Retrieve & parse wallpaper
const wallpaperRaw = await getWallpaper()
const wallpaper = sharp(wallpaperRaw.data, {
  raw: {
    width: wallpaperRaw.width,
    height: wallpaperRaw.height,
    channels: 3,
  }
})

// Save wallpapers to disk
for (const screen of screens.screens) {
  await wallpaper.clone()
    .extract({ left: screen.x, top: screen.y, width: screen.width, height: screen.height })
    .png().toFile(`wallpaper-${screen.output}.png`)
}