From ae4230a6d75c7f802ba656c98d2ff2ab865a3710 Mon Sep 17 00:00:00 2001
From: Tony Robinson <tony@tonyRobinson.com>
Date: Sun, 24 Sep 2023 16:17:31 +0100
Subject: [PATCH] Small change to fill() to exit early if there is nothing to
 do.

This avoids running unnessary code and avoids a bug in set_window().

Signed-off-by: Tony Robinson <tony@tonyRobinson.com>
---
 wasp/draw565.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/wasp/draw565.py b/wasp/draw565.py
index 7944ae4..c3fa0ff 100644
--- a/wasp/draw565.py
+++ b/wasp/draw565.py
@@ -150,9 +150,11 @@ class Draw565(object):
         if h is None:
             h = display.height - y
 
-        display.set_window(x, y, w, h)
-
         remaining = w * h
+        if remaining == 0:
+          return
+
+        display.set_window(x, y, w, h)
 
         # Populate the line buffer
         buf = display.linebuffer