Run results for: PutImageData vs DrawImage

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/98.0.4758.97 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 98

Operating system: iOS 15.3

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
DrawImage whole master into di canvas	1710611.0 Ops/sec
PutImageData whole master into pid canvas	4898.7 Ops/sec
DrawImage half master into di canvas	1231326.0 Ops/sec
PutImageData half master into pid canvas	4367.3 Ops/sec

HTML Preparation code:

<canvas id='master' width='100' height='100'></canvas>
<canvas id='pid' width='100' height='100'></canvas>
<canvas id='di' width='100' height='100'></canvas>

Script Preparation code:

var master = document.getElementById('master');
var masterctx = master.getContext('2d');
var pid = document.getElementById('pid').getContext('2d');
var di = document.getElementById('di').getContext('2d');

masterctx.fillRect(0,0,50,50);
masterctx.fillStyle = "red";
masterctx.fillRect(50,50,100,100);

Tests:

DrawImage whole master into di canvas
di.drawImage(master,0,0);
PutImageData whole master into pid canvas
let imgData = masterctx.getImageData(0,0,100,100); pid.putImageData(imgData,0,0);
DrawImage half master into di canvas
di.drawImage(master,25,0,50,100,25,0,50,100);
PutImageData half master into pid canvas
let imgData = masterctx.getImageData(25,0,75,100); pid.putImageData(imgData,25,0);

Run results for: PutImageData vs DrawImage

GetImageData with PutImageData vs just DrawImage

DrawImage whole master into di canvas

PutImageData whole master into pid canvas

DrawImage half master into di canvas

PutImageData half master into pid canvas