From 7d745f80245c8316127c736514a2c0d6aa65dcc2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 30 Oct 2016 21:33:57 +0530
Subject: [PATCH] Micro-optimization

---
 kitty/char_grid.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kitty/char_grid.py b/kitty/char_grid.py
index 7e0f48678..702d5be35 100644
--- a/kitty/char_grid.py
+++ b/kitty/char_grid.py
@@ -297,9 +297,10 @@ class CharGrid:
     def update_sprite_map(self):
         spmap, sptext = self.last_render_data.cell_data
         psp = self.sprites.primary_sprite_position
+        empty_val = psp(empty_cell)
         for i, key in enumerate(sptext):
             f = i * 9
-            spmap[f:f + 3] = psp(key)
+            spmap[f:f + 3] = empty_val if key is empty_cell else psp(key)
         self.sprites.set_sprite_map(spmap)
 
     def render_cells(self, sg, sprite_layout):