Run results for: OffsetScreenCanvas.measureText VS. Canvas.measureText

Run details:

User agent: Mozilla/5.0 (Android 16; Mobile; rv:149.0) Gecko/149.0 Firefox/149.0

Browser: Firefox Mobile 149

Operating system: Android

Device Platform: Mobile

Date tested: 27 days ago

Test name	Executions per second
measureText via Canvas	18314.8 Ops/sec
measureText via OffsetScreenCanvas	18897.2 Ops/sec

Script Preparation code:

const font = '12px sans-serif';
const testTexts = window.testTexts = '国口永水〇0o123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');

window.measureText = (() => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  ctx.font = font;
  return (txt) => ctx.measureText(txt);
})();

window.oscMeasureText = (() => {
  const canvas = new window.OffscreenCanvas(0, 0);
  const ctx = canvas.getContext('2d');
  ctx.font = font;
  return (txt) => ctx.measureText(txt);
})();

Tests:

measureText via Canvas
testTexts.map(txt => measureText(txt))
measureText via OffsetScreenCanvas
testTexts.map(txt => oscMeasureText(txt))

Run results for: OffsetScreenCanvas.measureText VS. Canvas.measureText

measureText via Canvas

measureText via OffsetScreenCanvas