From 7e7356dfd6921e650d7c5e5d02430c410a9a08be Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Mon, 14 Jan 2013 21:47:17 +0100
Subject: [PATCH] Add canvas checks

---
 src/ol/canvas/canvas.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 src/ol/canvas/canvas.js

diff --git a/src/ol/canvas/canvas.js b/src/ol/canvas/canvas.js
new file mode 100644
index 0000000000..4b62511cf7
--- /dev/null
+++ b/src/ol/canvas/canvas.js
@@ -0,0 +1,21 @@
+goog.provide('ol.canvas');
+
+goog.require('goog.dom');
+goog.require('goog.dom.TagName');
+
+
+/**
+ * @return {boolean} Is supported.
+ */
+ol.canvas.isSupported = function() {
+  if (!('HTMLCanvasElement' in goog.global)) {
+    return false;
+  }
+  try {
+    var canvas = /** @type {HTMLCanvasElement} */
+        (goog.dom.createElement(goog.dom.TagName.CANVAS));
+    return !goog.isNull(canvas.getContext('2d'));
+  } catch (e) {
+    return false;
+  }
+};