Move color processing to JS

Reviewed By: @vjeux

Differential Revision: D2346353

Libraries/StyleSheet/processColor.js

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule processColor
+ */
+'use strict';
+
+var tinycolor = require('tinycolor2');
+
+function processColor(color) {
+  if (!color || typeof color === 'number') {
+    return color;
+  } else if (color instanceof Array) {
+    return color.map(processColor);
+  } else {
+    var hexString = tinycolor(color).toHex8();
+    return parseInt(hexString, 16);
+  }
+}
+
+module.exports = processColor;