// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
// OffscreenCanvas test in a worker:2d.text.measure.actualBoundingBox.small-font
// Description:Testing that actualBoundingBox metrics are precise at small font sizes
// Note:

importScripts("/resources/testharness.js");
importScripts("/html/canvas/resources/canvas-tests.js");

promise_test(async t => {
  var canvas = new OffscreenCanvas(100, 50);
  var ctx = canvas.getContext('2d');

  var f = new FontFace("CanvasTest", "url('/fonts/CanvasTest.ttf')");
  f.load();
  self.fonts.add(f);
  await self.fonts.ready;
  ctx.font = '1.5px CanvasTest';
  ctx.direction = 'ltr';
  ctx.textAlign = 'left';
  ctx.textBaseline = 'alphabetic';
  // At small font sizes, Skia may store glyph bounds as integers, causing
  // loss of precision (crbug.com/479240778). The CanvasTest 'E' glyph fills
  // the em square (0, -0.25em) to (1em, 0.75em), so at 1.5px:
  //   actualBoundingBoxRight  ≈ 1.5   (1em)
  //   actualBoundingBoxAscent ≈ 1.125 (0.75em)
  //   actualBoundingBoxDescent≈ 0.375 (0.25em)
  // With integer quantization these would snap to 2, 2, 1 respectively.
  // Use ±0.25 tolerances so quantized values are reliably caught.
  var m = ctx.measureText('E');
  _assert(m.actualBoundingBoxRight > 1.25, "m.actualBoundingBoxRight > 1.25");
  _assert(m.actualBoundingBoxRight < 1.75, "m.actualBoundingBoxRight < 1.75");
  _assert(m.actualBoundingBoxAscent > 0.875, "m.actualBoundingBoxAscent > 0.875");
  _assert(m.actualBoundingBoxAscent < 1.375, "m.actualBoundingBoxAscent < 1.375");
  _assert(m.actualBoundingBoxDescent > 0.125, "m.actualBoundingBoxDescent > 0.125");
  _assert(m.actualBoundingBoxDescent < 0.625, "m.actualBoundingBoxDescent < 0.625");
}, "Testing that actualBoundingBox metrics are precise at small font sizes");
done();