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<!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";
var promise = img.decode();
img.src = "/images/green.svg";
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";
var first_promise = img.decode();
img.src = "/images/blue.png";
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";
var first_promise = img.decode();
img.src = "/images/green.svg";
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";
var first_promise = img.decode();
img.src = "/non/existent/path.png";
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";
var second_promise = img.decode();
assert_not_equals(first_promise, second_promise);
resolve(Promise.all([first_promise, second_promise]));
});
img.src = "/images/green.png";
});
}, document.title + " src changes to the same path succeed.");
// srcset tests
// -------------------
promise_test(function(t) {
var img = new Image();
img.srcset = "/images/green.png 100w";
var promise = img.decode();
img.srcset = "/images/green.svg 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 100w";
var first_promise = img.decode();
img.srcset = "/images/green.svg 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 100w";
var first_promise = img.decode();
img.srcset = "/non/existent/path.png 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>
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