Run results for: OffscreenCanvas

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Canvas	1624448640.0 Ops/sec
OffscreenCanvas	1651243776.0 Ops/sec

Script Preparation code:

var img = new Image();
var imageBitmap;
var doneLoading = false;
let canvas = document.createElement('canvas');

canvas.width = 640;
canvas.height = 480;
let canvas2 = document.createElement('canvas');
let offscreen = canvas2.transferControlToOffscreen();
offscreen.width = 640;
offscreen.height = 480;

var ctx = canvas.getContext('2d');
var ctx2 = offscreen.getContext('2d');

img.addEventListener('load', function() {
  Promise.all([
    createImageBitmap(img)
  ]).then(function(images) {
  imageBitmap = images[0];
  doneLoading = true;
}, false);
});

img.src = 'https://media.discordapp.net/attachments/447410261289205781/574359442913492992/unknown.png';

Tests:

Canvas
if (doneLoading) { ctx.clearRect(0,0,640,480); ctx.drawImage(imageBitmap,0,0); }
OffscreenCanvas
if (doneLoading) { ctx2.clearRect(0,0,640,480); ctx2.drawImage(imageBitmap,0,0); }