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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/286610">286610</a></dd>
<dt>Author</dt> <dd>heycam@apple.com</dd>
<dt>Date</dt> <dd>2021-12-07 12:51:03 -0800 (Tue, 07 Dec 2021)</dd>
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<h3>Log Message</h3>
<pre>Puzzle feature detection followup
https://bugs.webkit.org/show_bug.cgi?id=233946

Unreviewed.


* blog-files/wide-gamut-canvas/puzzle.html:</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkWebsiteswebkitorgChangeLog">trunk/Websites/webkit.org/ChangeLog</a></li>
<li><a href="#trunkWebsiteswebkitorgblogfileswidegamutcanvaspuzzlehtml">trunk/Websites/webkit.org/blog-files/wide-gamut-canvas/puzzle.html</a></li>
</ul>

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<h3>Diff</h3>
<a id="trunkWebsiteswebkitorgChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Websites/webkit.org/ChangeLog (286609 => 286610)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Websites/webkit.org/ChangeLog      2021-12-07 20:42:25 UTC (rev 286609)
+++ trunk/Websites/webkit.org/ChangeLog 2021-12-07 20:51:03 UTC (rev 286610)
</span><span class="lines">@@ -1,5 +1,14 @@
</span><span class="cx"> 2021-12-07  Cameron McCormack  <heycam@apple.com>
</span><span class="cx"> 
</span><ins>+        Puzzle feature detection followup
+        https://bugs.webkit.org/show_bug.cgi?id=233946
+
+        Unreviewed.
+
+        * blog-files/wide-gamut-canvas/puzzle.html:
+
+2021-12-07  Cameron McCormack  <heycam@apple.com>
+
</ins><span class="cx">         Tweak puzzle to use feature detection
</span><span class="cx">         https://bugs.webkit.org/show_bug.cgi?id=233946
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkWebsiteswebkitorgblogfileswidegamutcanvaspuzzlehtml"></a>
<div class="modfile"><h4>Modified: trunk/Websites/webkit.org/blog-files/wide-gamut-canvas/puzzle.html (286609 => 286610)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Websites/webkit.org/blog-files/wide-gamut-canvas/puzzle.html       2021-12-07 20:42:25 UTC (rev 286609)
+++ trunk/Websites/webkit.org/blog-files/wide-gamut-canvas/puzzle.html  2021-12-07 20:51:03 UTC (rev 286610)
</span><span class="lines">@@ -31,6 +31,7 @@
</span><span class="cx"> const EMPTY_SQUARE = SIZE * SIZE - 1;
</span><span class="cx"> const TILE_CORNER_RADIUS = 8;
</span><span class="cx"> 
</span><ins>+let supported = false;
</ins><span class="cx"> let width, height, board, blank;
</span><span class="cx"> let canvas, ctx;
</span><span class="cx"> let scale = 1;
</span><span class="lines">@@ -68,7 +69,21 @@
</span><span class="cx">     return "data:image/svg+xml;base64," + btoa(svg);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+function canvasSupportsDisplayP3() {
+    let canvas = document.createElement("canvas");
+    try {
+        let context = canvas.getContext("2d", { colorSpace: "display-p3" });
+        return context.getContextAttributes().colorSpace == "display-p3";
+    } catch {
+    }
+    return false;
+}
+
</ins><span class="cx"> function init() {
</span><ins>+    supported = canvasSupportsDisplayP3();
+    if (!supported)
+        document.body.className = "unsupported";
+
</ins><span class="cx">     canvas = placeholder;
</span><span class="cx">     width = image.naturalWidth;
</span><span class="cx">     height = image.naturalHeight;
</span><span class="lines">@@ -163,7 +178,7 @@
</span><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> function updateCanvas() {
</span><del>-    let colorSpace = displayP3.checked ? "display-p3" : "srgb";
</del><ins>+    let colorSpace = displayP3.checked && supported ? "display-p3" : "srgb";
</ins><span class="cx"> 
</span><span class="cx">     let newCanvas = cachedCanvases[colorSpace];
</span><span class="cx">     if (newCanvas != canvas) {
</span><span class="lines">@@ -182,12 +197,7 @@
</span><span class="cx">     canvas.style.width = `${width / scale}px`;
</span><span class="cx">     canvas.style.height = `${height / scale}px`;
</span><span class="cx"> 
</span><del>-    try {
-        ctx = canvas.getContext("2d", { colorSpace });
-    } catch {
-        ctx = canvas.getContext("2d");
-        document.body.className = "unsupported";
-    }
</del><ins>+    ctx = canvas.getContext("2d", { colorSpace });
</ins><span class="cx"> 
</span><span class="cx">     drawBoard();
</span><span class="cx"> }
</span></span></pre>
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