image-decode-path-changes.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-img-element/decode/image-decode-path-changes.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<meta name="timeout" content="long">

<title>HTMLImageElement.prototype.decode(), src/srcset mutation tests.</title>

<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">

<link rel=help href="https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-decode">

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

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

<script>

"use strict";

// src tests

// -------------------

promise_test(function(t) {

  var img = new Image();

  img.src = "/images/green.png?image-decode-path-changes-1";

  var promise = img.decode();

  img.src = "/images/green.svg?image-decode-path-changes-1";

  return promise_rejects_dom(t, "EncodingError", promise);

}, document.title + " src changes fail decode.");

promise_test(function(t) {

  var img = new Image();

  img.src = "/images/green.png?image-decode-path-changes-2";

  var first_promise = img.decode();

  img.src = "/images/blue.png?image-decode-path-changes-2";

  var second_promise = img.decode();

  assert_not_equals(first_promise, second_promise);

  return Promise.all([

    promise_rejects_dom(t, "EncodingError", first_promise),

    second_promise

]);

}, document.title + " src changes fail decode; following good png decode succeeds.");

promise_test(function(t) {

  var img = new Image();

  img.src = "/images/green.png?image-decode-path-changes-3";

  var first_promise = img.decode();

  img.src = "/images/green.svg?image-decode-path-changes-3";

  var second_promise = img.decode();

  assert_not_equals(first_promise, second_promise);

  return Promise.all([

    promise_rejects_dom(t, "EncodingError", first_promise),

    second_promise

]);

}, document.title + " src changes fail decode; following good svg decode succeeds.");

promise_test(function(t) {

  var img = new Image();

  img.src = "/images/green.png?image-decode-path-changes-4";

  var first_promise = img.decode();

  img.src = "/non/existent/path.png?image-decode-path-changes-5";

  var second_promise = img.decode();

  assert_not_equals(first_promise, second_promise);

  return Promise.all([

    promise_rejects_dom(t, "EncodingError", first_promise),

    promise_rejects_dom(t, "EncodingError", second_promise)

]);

}, document.title + " src changes fail decode; following bad decode fails.");

promise_test(function(t) {

  return new Promise(function(resolve, reject) {

    var img = new Image();

    // We wait for an onload, since the "Updating the image data" spec states

    // that if a new microtask is scheduled, the old one is canceled so

    // without the onload, the first decode request would be requested when the

    // img.src is empty. With an onload, we ensure that the img.src is set and

    // the image exists before issuing the first decode, then we verify that the

    // src change to the same value does not prevent that request from

    // succeeding.

    img.onload = t.step_func(function() {

      img.onload = null;

      var first_promise = img.decode();

      img.src = "/images/green.png?image-decode-path-changes-6";

      var second_promise = img.decode();

      assert_not_equals(first_promise, second_promise);

      resolve(Promise.all([first_promise, second_promise]));

});

    img.src = "/images/green.png?image-decode-path-changes-6";

});

}, document.title + " src changes to the same path succeed.");

// srcset tests

// -------------------

promise_test(function(t) {

  var img = new Image();

  img.srcset = "/images/green.png?image-decode-path-changes-7 100w";

  var promise = img.decode();

  img.srcset = "/images/green.svg?image-decode-path-changes-7 100w";

  return promise_rejects_dom(t, "EncodingError", promise);

}, document.title + " srcset changes fail decode.");

promise_test(function(t) {

  var img = new Image();

  img.srcset = "/images/green.png?image-decode-path-changes-8 100w";

  var first_promise = img.decode();

  img.srcset = "/images/green.svg?image-decode-path-changes-8 100w";

  var second_promise = img.decode();

  assert_not_equals(first_promise, second_promise);

  return Promise.all([

    promise_rejects_dom(t, "EncodingError", first_promise),

    second_promise

]);

}, document.title + " srcset changes fail decode; following good decode succeeds.");

promise_test(function(t) {

  var img = new Image();

  img.srcset = "/images/green.png?image-decode-path-changes-9 100w";

  var first_promise = img.decode();

  img.srcset = "/non/existent/path.png?image-decode-path-changes-9 100w";

  var second_promise = img.decode();

  assert_not_equals(first_promise, second_promise);

  return Promise.all([

    promise_rejects_dom(t, "EncodingError", first_promise),

    promise_rejects_dom(t, "EncodingError", second_promise)

]);

}, document.title + " srcset changes fail decode; following bad decode fails.");

</script>