Run results for: Bug with Resizing ImageBitmap causes slower than expected performance

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 UOS

Browser: Chrome 93

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
✓ ImageBitmap/Offscreen Resized	3,779,371 Ops/sec
ImageBitmap/Offscreen	3,749,745 Ops/sec
Image	3,445,760 Ops/sec

Script Preparation code:

var img = new Image();
img.decoding = 'sync';

var imageBitmap;
var imageBitmapResized;
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);
  
  Promise.all([
    createImageBitmap(img, {imageOrientation: "none", premultiplyAlpha: "none", resizeWidth:~~(img.width/2), resizeHeight:~~(img.height/2), resizeQuality:"low"})
  ]).then(function(images) {
  imageBitmapResized = images[0];
  doneLoading = true;
}, false);
  
});

img.src = 'https://media.discordapp.net/attachments/447410261289205781/574359442913492992/unknown.png';

Tests:

Image
if (doneLoading) ctx.drawImage(img,0,0);
ImageBitmap/Offscreen
if (doneLoading) ctx.drawImage(imageBitmap,0,0);
ImageBitmap/Offscreen Resized
if (doneLoading) ctx.drawImage(imageBitmapResized,0,0);

Run results for: Bug with Resizing ImageBitmap causes slower than expected performance

Image

ImageBitmap/Offscreen

ImageBitmap/Offscreen Resized