Run results for: Canvas Image vs Image Bitmap

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Canvas Image

83K/s

Image Bitmap

20K/s

View exact numbers

Test name	Executions per second
✓ Canvas Image	82,799 Ops/sec
Image Bitmap	20,422 Ops/sec

Script Preparation code:

var img = new Image();
var imageBitmap;
var doneLoading = false;
var canvas = document.createElement('canvas');
canvas.width = 640;
canvas.height = 480;
var canvas2 = document.createElement('canvas');
canvas2.width = 640;
canvas2.height = 480;

var ctx = canvas.getContext('2d');
var ctx2 = canvas2.getContext('2d');

img.addEventListener('load', function() {
  Promise.all([
    createImageBitmap(img)
  ]).then(function(images) {
  imageBitmap = images[0];
  doneLoading = true;
}, false);
});

if (doneLoading) {
  ctx.drawImage(img,0,0)
}

img.src = 'https://1.bp.blogspot.com/-52MtzD0GfX0/WvP52CL1WjI/AAAAAAAAOVw/_OpK4JHeWK01d-7IiZ6vzojYGhXqLRXrACLcBGAs/s1600/EMxediL.jpg';

Tests:

Canvas Image
if (doneLoading) ctx2.drawImage(canvas,0,0);
Image Bitmap
if (doneLoading) ctx2.drawImage(imageBitmap,0,0);