From ae8e284d417c42bfb3764941aa57263fe47db2ee Mon Sep 17 00:00:00 2001
From: Josh Goebel <me@joshgoebel.com>
Date: Tue, 21 Mar 2017 14:57:41 -0400
Subject: [PATCH] optimize drawChar (-126 bytes)

---
 src/Arduboy2.cpp | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/Arduboy2.cpp b/src/Arduboy2.cpp
index ff5ac46..b2cbf8a 100644
--- a/src/Arduboy2.cpp
+++ b/src/Arduboy2.cpp
@@ -1159,7 +1159,9 @@ size_t Arduboy2::write(uint8_t c)
 void Arduboy2::drawChar
   (int16_t x, int16_t y, unsigned char c, uint8_t color, uint8_t bg, uint8_t size)
 {
+  uint8_t line;
   bool draw_background = bg != color;
+  uint8_t *bitmap = font + c*5;
 
   if ((x >= WIDTH) ||              // Clip right
       (y >= HEIGHT) ||             // Clip bottom
@@ -1170,17 +1172,12 @@ void Arduboy2::drawChar
     return;
   }
 
-  for (int8_t i=0; i<6; i++ )
+  for (uint8_t i=0; i<6; i++ )
   {
-    uint8_t line;
-    if (i == 5)
-    {
+    line = pgm_read_byte(bitmap++);
+    if (i == 5) {
       line = 0x0;
     }
-    else
-    {
-      line = pgm_read_byte(font+(c*5)+i);
-    }
 
     for (int8_t j = 0; j<8; j++)
     {