2d.text.measure.text-clusters-range.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/text/2d.text.measure.text-clusters-range.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->

<meta charset="UTF-8">

<title>OffscreenCanvas test: 2d.text.measure.text-clusters-range.tentative</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.text.measure.text-clusters-range.tentative</h1>

<p class="desc">Test that getTextClusters() and fillTextCluster() correctly render different ranges of the input text.</p>

<script>

promise_test(async t => {

  var canvas = new OffscreenCanvas(400, 300);

  var ctx = canvas.getContext('2d');

  // Renders all the clusters in the list from position (x, y).

  function renderClusters(clusters, x, y) {

    for (const cluster of clusters) {

      ctx.fillTextCluster(cluster, x, y);

  var f = new FontFace("CanvasTest", "url('/fonts/CanvasTest.ttf')");

  f.load();

  document.fonts.add(f);

  await document.fonts.ready;

  ctx.font = '50px CanvasTest';

  ctx.textAlign = 'left';

  ctx.textBaseline = 'top';

  const text = 'EEEEE';

  let tm = ctx.measureText(text);

  // Background color.

  ctx.fillStyle = '#f00';

  ctx.fillRect(0, 0, canvas.width, canvas.height);

  ctx.fillStyle = '#0f0';

  // Without the first character.

  renderClusters(tm.getTextClusters(1, 5), 0, 0);

  _assertPixelApprox(canvas, 5,5, 255,0,0,255, 2);

  _assertPixelApprox(canvas, 55,5, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 105,5, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 155,5, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 205,5, 0,255,0,255, 2);

  // Without the last character.

  renderClusters(tm.getTextClusters(0, 4), 0, 100);

  _assertPixelApprox(canvas, 5,105, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 55,105, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 105,105, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 155,105, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 205,105, 255,0,0,255, 2);

  // Only the middle character.

  renderClusters(tm.getTextClusters(2, 3), 0, 150);

  _assertPixelApprox(canvas, 5,155, 255,0,0,255, 2);

  _assertPixelApprox(canvas, 55,155, 255,0,0,255, 2);

  _assertPixelApprox(canvas, 105,155, 0,255,0,255, 2);

  _assertPixelApprox(canvas, 155,155, 255,0,0,255, 2);

  _assertPixelApprox(canvas, 205,155, 255,0,0,255, 2);

}, "Test that getTextClusters() and fillTextCluster() correctly render different ranges of the input text.");

</script>