JuanIrache/README.md

## README.md

      
    Raw
  

              README.md
            
          
    electron-worker-memory-leak


## index.html
<!DOCTYPE html>
<html lang="en">
  <head>
    <script src="https://cdn.jsdelivr.net/npm/p5@1.6.0/lib/p5.js"></script>
    <meta charset="utf-8" />
  </head>
  <body>
    <script src="renderer.js"></script>
  </body>
</html>

## main.js
// Modules to control application life and create native browser window
const {app, BrowserWindow} = require('electron')
const path = require('path')

function createWindow () {
  // Create the browser window.
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.whenReady().then(() => {
  createWindow()

  app.on('activate', function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})

// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

## package.json
{
  "name": "juvenile-device-arrive-n7qbx",
  "productName": "juvenile-device-arrive-n7qbx",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "juanirache",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "24.0.0-beta.2"
  }
}

## preload.js
/**
 * The preload script runs before. It has access to web APIs
 * as well as Electron's renderer process modules and some
 * polyfilled Node.js functions.
 *
 * https://www.electronjs.org/docs/latest/tutorial/sandbox
 */
window.addEventListener('DOMContentLoaded', () => {
  const replaceText = (selector, text) => {
    const element = document.getElementById(selector)
    if (element) element.innerText = text
  }

  for (const type of ['chrome', 'node', 'electron']) {
    replaceText(`${type}-version`, process.versions[type])
  }
})

## renderer.js
let worker, canvas, img

const timeout = (n) => new Promise((r) => setTimeout(r, n))

function preload() {
  img = loadImage(
    'https://images.unsplash.com/photo-1678639492459-d1f4771e6d0b?ixlib=rb-4.0.3&q=80&fm=jpg&crop=entropy&cs=tinysrgb'
  )
}

function setup() {
  canvas = createCanvas(800, 600).elt
  noLoop()
  worker = new Worker('worker.js')
  worker.onmessage = workerDone
  worker.postMessage({ action: 'setSize', payload: { width, height } })
  paint()
}

function workerDone({ data }) {
  console.log('received', data.byteLength)
  // Do something with the data
  paint()
}

const paint = async () => {
  image(img, random(-2, 2), random(-2, 2))
  createImageBitmap(canvas).then((bitmap) => {
    worker.postMessage({ action: 'saveFrame', payload: bitmap }, [bitmap])
  })
}

## styles.css
/* styles.css */

/* Add styles here to customize the appearance of your app */

## worker.js
const canvas = new OffscreenCanvas(300, 300)
const ctx = canvas.getContext('bitmaprenderer')

this.onmessage = function ({ data }) {
  const worker = this
  const { action, payload } = data

  if (action === 'setSize') {
    const { width, height } = payload
    canvas.width = width
    canvas.height = height
  } else if (action === 'saveFrame') {
    ctx.transferFromImageBitmap(payload)
    canvas.convertToBlob().then((blob) => {
      blob.arrayBuffer().then((arrBuf) => {
        worker.postMessage(arrBuf, [arrBuf])
      })
    })
  }
}
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<script src="https://cdn.jsdelivr.net/npm/p5@1.6.0/lib/p5.js"></script>
	<meta charset="utf-8" />
	</head>
	<body>
	<script src="renderer.js"></script>
	</body>
	</html>
	// Modules to control application life and create native browser window
	const {app, BrowserWindow} = require('electron')
	const path = require('path')

	function createWindow () {
	// Create the browser window.
	const mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	preload: path.join(__dirname, 'preload.js')
	}
	})

	// and load the index.html of the app.
	mainWindow.loadFile('index.html')

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()
	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.whenReady().then(() => {
	createWindow()

	app.on('activate', function () {
	// On macOS it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (BrowserWindow.getAllWindows().length === 0) createWindow()
	})
	})

	// Quit when all windows are closed, except on macOS. There, it's common
	// for applications and their menu bar to stay active until the user quits
	// explicitly with Cmd + Q.
	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})

	// In this file you can include the rest of your app's specific main process
	// code. You can also put them in separate files and require them here.
	{
	"name": "juvenile-device-arrive-n7qbx",
	"productName": "juvenile-device-arrive-n7qbx",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "juanirache",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "24.0.0-beta.2"
	}
	}
	/**
	* The preload script runs before. It has access to web APIs
	* as well as Electron's renderer process modules and some
	* polyfilled Node.js functions.
	*
	* https://www.electronjs.org/docs/latest/tutorial/sandbox
	*/
	window.addEventListener('DOMContentLoaded', () => {
	const replaceText = (selector, text) => {
	const element = document.getElementById(selector)
	if (element) element.innerText = text
	}

	for (const type of ['chrome', 'node', 'electron']) {
	replaceText(`${type}-version`, process.versions[type])
	}
	})
	let worker, canvas, img

	const timeout = (n) => new Promise((r) => setTimeout(r, n))

	function preload() {
	img = loadImage(
	'https://images.unsplash.com/photo-1678639492459-d1f4771e6d0b?ixlib=rb-4.0.3&q=80&fm=jpg&crop=entropy&cs=tinysrgb'
	)
	}

	function setup() {
	canvas = createCanvas(800, 600).elt
	noLoop()
	worker = new Worker('worker.js')
	worker.onmessage = workerDone
	worker.postMessage({ action: 'setSize', payload: { width, height } })
	paint()
	}

	function workerDone({ data }) {
	console.log('received', data.byteLength)
	// Do something with the data
	paint()
	}

	const paint = async () => {
	image(img, random(-2, 2), random(-2, 2))
	createImageBitmap(canvas).then((bitmap) => {
	worker.postMessage({ action: 'saveFrame', payload: bitmap }, [bitmap])
	})
	}
	/* styles.css */

	/* Add styles here to customize the appearance of your app */
	const canvas = new OffscreenCanvas(300, 300)
	const ctx = canvas.getContext('bitmaprenderer')

	this.onmessage = function ({ data }) {
	const worker = this
	const { action, payload } = data

	if (action === 'setSize') {
	const { width, height } = payload
	canvas.width = width
	canvas.height = height
	} else if (action === 'saveFrame') {
	ctx.transferFromImageBitmap(payload)
	canvas.convertToBlob().then((blob) => {
	blob.arrayBuffer().then((arrBuf) => {
	worker.postMessage(arrBuf, [arrBuf])
	})
	})
	}
	}