From de27a6fd888aebfa8cd4040349498f9140af0b69 Mon Sep 17 00:00:00 2001
From: Luke Page <luke.a.page@gmail.com>
Date: Tue, 30 Apr 2013 18:58:35 +0100
Subject: [PATCH] Add bypass for saturate(5%) filter function. Helps issue
 #1299

---
 lib/less/functions.js    | 5 +++++
 test/css/functions.css   | 1 +
 test/less/functions.less | 1 +
 3 files changed, 7 insertions(+)

diff --git a/lib/less/functions.js b/lib/less/functions.js
index fbde54ff..361be6f4 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -96,6 +96,11 @@ tree.functions = {
         return new(tree.Dimension)(Math.round(color.luma() * color.alpha * 100), '%');
     },
     saturate: function (color, amount) {
+        // filter: saturate(3.2);
+        // should be kept as is, so check for color
+        if (!color.rgb) {
+            return null;
+        }
         var hsl = color.toHSL();
 
         hsl.s += amount.value / 100;
diff --git a/test/css/functions.css b/test/css/functions.css
index eacebd8d..d1392c35 100644
--- a/test/css/functions.css
+++ b/test/css/functions.css
@@ -26,6 +26,7 @@
   luma-cyan: 79%;
   luma-white-alpha: 50%;
   contrast-filter: contrast(30%);
+  saturate-filter: saturate(5%);
   contrast-white: #000000;
   contrast-black: #ffffff;
   contrast-red: #ffffff;
diff --git a/test/less/functions.less b/test/less/functions.less
index f60dab47..337e9eb6 100644
--- a/test/less/functions.less
+++ b/test/less/functions.less
@@ -30,6 +30,7 @@
   luma-cyan: luma(#00ffff);
   luma-white-alpha: luma(rgba(255,255,255,0.5));
   contrast-filter: contrast(30%);
+  saturate-filter: saturate(5%);
   contrast-white: contrast(#fff);
   contrast-black: contrast(#000);
   contrast-red: contrast(#ff0000);