helper_fission_setResolution.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>setResolutionAndScaleTo is properly delivered to OOP iframes</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/paint_listener.js"></script>

  <script src="helper_fission_utils.js"></script>

  <script src="apz_test_utils.js"></script>

  <script>

    async function test() {

      let iframeElement = document.getElementById("testframe");

      await setupCrossOriginIFrame(iframeElement, "helper_fission_plain.html");

      const scale = 2.0;

      SpecialPowers.getDOMWindowUtils(window).setResolutionAndScaleTo(scale);

      await promiseApzFlushedRepaints();

      await waitUntilApzStable();

      const originalWidth = originalHeight = 100;

      // eslint-disable-next-line no-unused-vars

      let { _x, _y, width, height } = await SpecialPowers.spawn(

        iframeElement,

        [originalWidth, originalHeight],

        // eslint-disable-next-line no-shadow

        (width, height) => {

          // nsIDOMWindowUtils.toScreenRect uses the iframe's transform which should

          // have been informed from APZ.

          return SpecialPowers.DOMWindowUtils.toScreenRect(0, 0, width, height);

);

      is(width, scale * originalWidth * window.devicePixelRatio,

        "The resolution value should be properly delivered into OOP iframes");

      is(height, scale * originalHeight * window.devicePixelRatio,

        "The resolution value should be properly delivered into OOP iframes");

    waitUntilApzStable()

      .then(test)

      .then(subtestDone, subtestFailed);

  </script>

  <style>

    body,

    html {

      margin: 0;

  </style>

</head>

<body>

  <iframe id="testframe"></iframe>

</body>

</html>