# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1444481609 -7200
# Node ID 4cafde6aa7379453e718ed03fedc5722785c1294
# Parent  5b3e85002c1048fd41536b731b48c3a9b0bc63b4
Perform explicit RGB operations for improved performance.

diff -r 5b3e85002c10 -r 4cafde6aa737 optimiser.py
--- a/optimiser.py	Fri Oct 09 22:16:49 2015 +0200
+++ b/optimiser.py	Sat Oct 10 14:53:29 2015 +0200
@@ -47,13 +47,16 @@
     return math.sqrt(pow(r1 - r2, 2) + pow(g1 - g2, 2) + pow(b1 - b2, 2))
 
 def restore(srgb):
-    return tuple(map(lambda x: int(x * 255.0), srgb))
+    r, g, b = srgb
+    return int(r * 255.0), int(g * 255.0), int(b * 255.0)
 
 def scale(rgb):
-    return tuple(map(lambda x: x / 255.0, rgb))
+    r, g, b = rgb
+    return r / 255.0, g / 255.0, b / 255.0
 
 def invert(srgb):
-    return tuple(map(lambda x: 1.0 - x, srgb))
+    r, g, b = srgb
+    return 1.0 - r, 1.0 - g, 1.0 - b
 
 # Colour distribution functions.