<!DOCTYPE html>
<meta charset="utf-8">
<title>
  Async Clipboard writeImageExperimental -> readImageExperimental tests
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<p>
  <p>The bottom image should display the same image as the top image.</p>
  <p>Original Image:</p>
  <image id='image-to-copy' width='20' height='20'
        src="resources/greenbox.png"></image>
  <p>Image after copy/paste:</p>
  <image id='image-on-clipboard'></image>
  <canvas id='canvas' width='20' height='20'></canvas>
</p>

<script>
// Must compare a bitmap as opposed to simply blob data, because an encoded
// image may have different contents depending on encoder.
async function getBitmapString(blob) {
  const imageBitmap = await createImageBitmap(blob);
  const canvas = document.getElementById('canvas');
  const ctx = canvas.getContext('2d');

  ctx.drawImage(imageBitmap, 0,0);

  let imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  return imageData.data.toString();
};

async function loadBlob(fileName) {
  const fetched = await fetch(fileName);
  return await fetched.blob();
}

promise_test(async t => {
  const input = await loadBlob('resources/greenbox.png');

  await navigator.clipboard.writeImageExperimental(input);
  const output = await navigator.clipboard.readImageExperimental();

  document.getElementById('image-on-clipboard').src =
      window.URL.createObjectURL(output);

  const comparableInput = await getBitmapString(input);
  const comparableOutput = await getBitmapString(output);

  assert_equals(comparableOutput, comparableInput);
}, "Verify write and read clipboard (DOMString)");
</script>
<p>
  Note: This is a manual test because it writes/reads to the shared system
  clipboard and thus cannot be run async with other tests that might interact
  with the clipboard.
</p>