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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test that img.decode works on finished, discarded animated images</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+ <script type="text/javascript" src="imgutils.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1629490">Mozilla Bug 1629490</a>
+<div id="container">
+ <img id="finitepng" src="finite-apng.png">
+</div>
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+window.onload = runTest;
+
+let discardCallback = undefined;
+let frameUpdateCallback = undefined;
+
+async function runTest() {
+ const kUsingWebRender = SpecialPowers.DOMWindowUtils.layerManagerType.startsWith("WebRender");
+
+ let img = document.getElementById("finitepng");
+
+ await img.decode();
+
+ while (!isItGreen(img)) {
+ // We hit an optimized path in WebRender that doesn't cause a repaint on the
+ // main thread and doesn't seem to send MozAfterPaints.
+ //
+ // https://searchfox.org/mozilla-central/rev/b7f3977978922d44c7d92ae01c0d4cc2baca7bc2/layout/style/ImageLoader.cpp#553
+ await new Promise(resolve => {
+ if (kUsingWebRender) {
+ requestAnimationFrame(() => {
+ requestAnimationFrame(resolve);
+ });
+ } else {
+ window.addEventListener("MozAfterPaint", resolve, { once: true });
+ }
+ });
+ }
+
+ addCallbacks(img);
+
+ let iterationsLeft = 26;
+ while (iterationsLeft > 0) {
+
+ let discardPromise = new Promise(resolve => {
+ discardCallback = resolve;
+ });
+
+ document.getElementById("container").style.display = "none";
+ document.documentElement.offsetLeft; // force that style to take effect
+ requestDiscard(img);
+
+ await new Promise(resolve => {requestAnimationFrame(() => { requestAnimationFrame(resolve); }); });
+
+ await discardPromise;
+ await new Promise(resolve => {requestAnimationFrame(() => { requestAnimationFrame(resolve); }); });
+
+ let waitForFrameUpdate = new Promise(resolve => {
+ frameUpdateCallback = resolve;
+ });
+
+ document.getElementById("container").style.display = "";
+ document.documentElement.offsetLeft; // force that style to take effect
+
+ await img.decode();
+
+ await new Promise(resolve => requestAnimationFrame(resolve));
+
+ await waitForFrameUpdate;
+
+ ok(isItGreen(img), "should be green");
+
+ iterationsLeft--;
+ await new Promise(resolve => {requestAnimationFrame(() => { requestAnimationFrame(resolve); }); });
+
+ }
+
+ removeObserver(img);
+ SimpleTest.finish();
+}
+
+function isItGreen(img) {
+ let rect = img.getBoundingClientRect();
+ let r = {left: rect.left + 5, top: rect.top + 5, width: 5, height: 5};
+ let c = SpecialPowers.snapshotWindowWithOptions(window, r);
+ let d = c.getContext('2d').getImageData(0,0,5,5).data;
+ let isGreen = true;
+ for (let i = 0; i < 5*5; i++) {
+ if (d[4*i] != 0 || d[4*i + 1] != 128 || d[4*i + 2] != 0 || d[4*i + 3] != 255) {
+ isGreen = false;
+ }
+ }
+ return isGreen;
+}
+
+
+let scriptedObserver = undefined;
+let imgLoadingContent = undefined;
+function addCallbacks(anImage) {
+ var observer = new ImageDecoderObserverStub();
+ observer.discard = function () {
+ if (discardCallback != undefined) {
+ let localDiscardCallback = discardCallback;
+ discardCallback = undefined;
+ setTimeout(localDiscardCallback, 0);
+ }
+ };
+ observer.frameUpdate = function () {
+ if (frameUpdateCallback != undefined) {
+ let localFrameUpdateCallback = frameUpdateCallback;
+ frameUpdateCallback = undefined;
+ setTimeout(localFrameUpdateCallback, 0);
+ }
+ };
+ observer = SpecialPowers.wrapCallbackObject(observer);
+
+ scriptedObserver = SpecialPowers.Cc["@mozilla.org/image/tools;1"]
+ .getService(SpecialPowers.Ci.imgITools)
+ .createScriptedObserver(observer);
+
+ imgLoadingContent = SpecialPowers.wrap(anImage);
+ imgLoadingContent.addObserver(scriptedObserver);
+}
+
+function removeObserver(anImage) {
+ imgLoadingContent.removeObserver(scriptedObserver);
+}
+
+function requestDiscard(anImage) {
+ var request = SpecialPowers.wrap(anImage)
+ .getRequest(SpecialPowers.Ci.nsIImageLoadingContent.CURRENT_REQUEST);
+ setTimeout(() => request.requestDiscard(), 0);
+}
+
+</script>
+</body>
+</html>