rename the aux folder to util, because windows. fixes issue #3

scripts/util/canvas.js

@@ -0,0 +1,38 @@
+/*global define*/
+define(
+	function()
+	{
+		var update = false;
+
+		function resize( canvas, size )
+		{
+
+			if ( canvas.width !== size.width )
+			{
+				canvas.width = size.width;
+				update = true;
+			}
+
+			if ( canvas.height !== size.height )
+			{
+				canvas.height = size.height;
+				update = true;
+			}
+
+			if ( update )
+			{
+				canvas.width = size.width;
+				canvas.height = size.height;
+			}
+
+			update = false;
+		}
+
+		function clear( canvas, ctx )
+		{
+			ctx.clearRect( ctx, 0, 0, canvas.width, canvas.height );
+		}
+
+		return { resize: resize, clear: clear };
+	}
+);

scripts/util/feature-test.js

@@ -0,0 +1,48 @@
+/*global define*/
+define(
+	function()
+	{
+		var tests = {
+			'canvas': { required: true, test: function(){ return !! document.createElement('canvas').getContext; } },
+			'query-selector-all': { required: false, test: function(){ return !! document.querySelectorAll; } },
+			'drag-drop': { required: false, test: function(){ return 'draggable' in document.createElement('span'); } },
+			'file-api': { required: false, test: function(){ return typeof FileReader !== 'undefined'; } }
+		};
+
+		function test( success, error )
+		{
+			var required_supported = true;
+			var results = { };
+			var required_features_missing = [ ];
+
+			for ( var key in tests )
+			{
+				var result = tests[key].test();
+
+				if ( ! result )
+				{
+					if ( tests[key].required )
+					{
+						required_supported = false;
+
+						required_features_missing.push( key );
+					}
+				}
+
+				results[key] = result;
+			}
+
+			if ( required_supported )
+			{
+				success( results );
+			}
+
+			else
+			{
+				error( required_features_missing, results );
+			}
+		}
+
+		return test;
+	}
+);