From 14ae1a679e341fa03d8b606feb4a65eb15527e35 Mon Sep 17 00:00:00 2001
From: Gordon Shumway <39967334+oddluck@users.noreply.github.com>
Date: Thu, 25 Apr 2019 23:10:31 -0400
Subject: [PATCH] speed up color matching

---
 ASCII/plugin.py | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/ASCII/plugin.py b/ASCII/plugin.py
index d49d500..b50094e 100644
--- a/ASCII/plugin.py
+++ b/ASCII/plugin.py
@@ -42,6 +42,8 @@ class ASCII(callbacks.Plugin):
         self.__parent = super(ASCII, self)
         self.__parent.__init__(irc)
         self.colors = 83
+        self.matches = {}
+        self.matches16 = {}
         self.ircColors= {
             (11.5497, 31.8768, 18.1739):16,
             (17.5866, 15.7066, 25.9892):17,
@@ -202,18 +204,23 @@ class ASCII(callbacks.Plugin):
         """
         Given PIL Image, return average RGB value
         """
+        pixel = tuple(pixel)
         if self.colors == 16:
             speed = speed
             colors = list(self.colors16.keys())
-            closest_colors = sorted(colors, key=lambda color: self.distance(self.rgb2lab(color), self.rgb2lab(pixel), speed))
-            closest_color = closest_colors[0]
-            return self.colors16[closest_color]
+            if pixel not in self.matches16:
+                closest_colors = sorted(colors, key=lambda color: self.distance(self.rgb2lab(color), self.rgb2lab(pixel), speed))
+                closest_color = closest_colors[0]
+                self.matches16[pixel] = self.colors16[closest_color]
+            return self.matches16[pixel]
         else:
             speed = speed
             colors = list(self.ircColors.keys())
-            closest_colors = sorted(colors, key=lambda color: self.distance(color, self.rgb2lab(pixel), speed))
-            closest_color = closest_colors[0]
-            return self.ircColors[closest_color]
+            if pixel not in self.matches:
+                closest_colors = sorted(colors, key=lambda color: self.distance(color, self.rgb2lab(pixel), speed))
+                closest_color = closest_colors[0]
+                self.matches[pixel] = self.ircColors[closest_color]
+            return self.matches[pixel]
 
     def rgb2lab (self, inputColor) :
         num = 0