Run results for: PutImageData vs DrawImage vs fillRect

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/138.0 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 18

Operating system: iOS 18.4.1

Device Platform: Mobile

Date tested: one year ago

rect

1.2M/s

DrawImage whole master into di canvas

250K/s

DrawImage half master into di canvas

227K/s

PutImageData whole master into pid canvas

8K/s

PutImageData half master into pid canvas

4K/s

View exact numbers

Test name	Executions per second
✓ rect	1,234,424 Ops/sec
DrawImage whole master into di canvas	250,033 Ops/sec
DrawImage half master into di canvas	227,069 Ops/sec
PutImageData whole master into pid canvas	7,548 Ops/sec
PutImageData half master into pid canvas	4,063 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>
<canvas id='rect' 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');
var rect = document.getElementById('rect').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);
rect
rect.fillRect(0,0,50,50); rect.fillStyle = "red"; rect.fillRect(50,50,100,100);