ColorUtil.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4480 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/ColorUtil.as

@@ -0,0 +1,31 @@
+//
+// $Id$
+
+package com.threerings.util {
+
+/**
+ * Color utility methods.
+ *
+ * See also mx.utils.ColorUtil.
+ */
+public class ColorUtil
+{
+    /**
+     * Blend the two colors, either 50-50 or according to the ratio specified.
+     */
+    public static function blend (
+        first :uint, second :uint, firstPerc :Number = 0.5) :uint
+    {
+        var secondPerc :Number = 1 - firstPerc;
+
+        var result :uint = 0;
+        for (var shift :int = 0; shift <= 16; shift += 8) {
+            var c1 :uint = (first >> shift) & 0xFF;
+            var c2 :uint = (second >> shift) & 0xFF;
+            result |= uint(Math.max(0, Math.min(255,
+                (c1 * firstPerc) + (c2 * secondPerc)))) << shift;
+        }
+        return result;
+    }
+}
+}