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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/281195">281195</a></dd>
<dt>Author</dt> <dd>wenson_hsieh@apple.com</dd>
<dt>Date</dt> <dd>2021-08-18 09:58:52 -0700 (Wed, 18 Aug 2021)</dd>
</dl>

<h3>Log Message</h3>
<pre>Add a layout test for webkit.org/b/229200
https://bugs.webkit.org/show_bug.cgi?id=229222
rdar://81636256

Reviewed by Simon Fraser.

Add a layout test to exercise the hang fixed in bug #229200. This test can be manually run by opening it in
browser and verifying that the page does not hang (and outputs the expected PASS messages).

* fast/canvas/draw-text-repeatedly-into-disconnected-canvas-expected.txt: Added.
* fast/canvas/draw-text-repeatedly-into-disconnected-canvas.html: Added.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastcanvasdrawtextrepeatedlyintodisconnectedcanvasexpectedtxt">trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastcanvasdrawtextrepeatedlyintodisconnectedcanvashtml">trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (281194 => 281195)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog      2021-08-18 16:58:30 UTC (rev 281194)
+++ trunk/LayoutTests/ChangeLog 2021-08-18 16:58:52 UTC (rev 281195)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2021-08-18  Wenson Hsieh  <wenson_hsieh@apple.com>
+
+        Add a layout test for webkit.org/b/229200
+        https://bugs.webkit.org/show_bug.cgi?id=229222
+        rdar://81636256
+
+        Reviewed by Simon Fraser.
+
+        Add a layout test to exercise the hang fixed in bug #229200. This test can be manually run by opening it in
+        browser and verifying that the page does not hang (and outputs the expected PASS messages).
+
+        * fast/canvas/draw-text-repeatedly-into-disconnected-canvas-expected.txt: Added.
+        * fast/canvas/draw-text-repeatedly-into-disconnected-canvas.html: Added.
+
</ins><span class="cx"> 2021-08-18  Eric Hutchison  <ehutchison@apple.com>
</span><span class="cx"> 
</span><span class="cx">         [Mac wk1] css/css-position/position-relative-table* tests fail.
</span></span></pre></div>
<a id="trunkLayoutTestsfastcanvasdrawtextrepeatedlyintodisconnectedcanvasexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas-expected.txt (0 => 281195)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas-expected.txt                         (rev 0)
+++ trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas-expected.txt    2021-08-18 16:58:52 UTC (rev 281195)
</span><span class="lines">@@ -0,0 +1,5 @@
</span><ins>+PASS Done painting
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastcanvasdrawtextrepeatedlyintodisconnectedcanvashtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas.html (0 => 281195)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas.html                         (rev 0)
+++ trunk/LayoutTests/fast/canvas/draw-text-repeatedly-into-disconnected-canvas.html    2021-08-18 16:58:52 UTC (rev 281195)
</span><span class="lines">@@ -0,0 +1,61 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<script src="../../resources/js-test.js"></script>
+<script src="../../resources/ui-helper.js"></script>
+<script>
+jsTestIsAsync = true;
+addEventListener("load", async () => {
+    await document.fonts.load("16px Ahem");
+
+    for (let i = 0; i < 3; ++i)
+        await paintIntoCanvas();
+
+    await paintIntoCanvas(document.getElementById("final-target"));
+
+    testPassed("Done painting");
+    finishJSTest();
+});
+
+async function paintIntoCanvas(target) {
+    let canvas = target || document.createElement("canvas");
+    let context = canvas.getContext("2d");
+
+    context.font = "16px Ahem";
+    context.strokeText("Hello world", 10, 10);
+    context.strokeText("Hello world", 20, 20);
+
+    for (let i = 0; i < 5; ++i)
+        await UIHelper.renderingUpdate();
+
+    delete context;
+    delete canvas;
+    gc();
+}
+
+function gc() {
+    if (window.GCController)
+        return GCController.collect();
+
+    let strings = [];
+    for (let i = 0; i < 1000000; ++i)
+        strings.push(new String(i));
+}
+</script>
+<style>
+@font-face {
+    font-family: Ahem;
+    src: url("../../resources/Ahem.ttf");
+}
+
+canvas {
+    width: 400px;
+    height: 400px;
+    margin-top: 0;
+}
+</style>
+</head>
+<body>
+    <canvas width="400" height="400" id="final-target"></canvas>
+</body>
+</html>
</ins><span class="cx">\ No newline at end of file
</span></span></pre>
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