From 3708a3accc00d70ca409884c713ab05f784d5a8a Mon Sep 17 00:00:00 2001
From: Christian Kroll <chris@das-labor.org>
Date: Wed, 22 Dec 2010 23:18:11 +0000
Subject: [PATCH] optimzed checkerboard animation - saving 76 bytes - yeah

---
 animations/programm.c | 16 +++++-----------
 display_loop.c        |  2 +-
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/animations/programm.c b/animations/programm.c
index 002ae38..a3802ce 100644
--- a/animations/programm.c
+++ b/animations/programm.c
@@ -350,17 +350,11 @@ unsigned char i, j, x;
 #ifdef ANIMATION_SCHACHBRETT
 void schachbrett(unsigned char times){
 	clear_screen(0);
-	unsigned char j;
-	for(j=0;j<times;j++){
-		unsigned char i, x;
-		for(i = 0; i<NUM_ROWS; i++){
-			for(x=0;x<LINEBYTES;x++)
-				pixmap[2][i][x] = 0x55<<(i&0x01);
-		}
-		wait(200);
-		for(i = 0; i<NUM_ROWS; i++){
-			for(x=0;x<LINEBYTES;x++)
-				pixmap[2][i][x] = 0xAA>>(i&0x01);
+	for (unsigned char i = 0; i < times; ++i) {
+		for (unsigned char row = 0; row < NUM_ROWS; ++row) {
+			for (unsigned char col = 0; col < LINEBYTES; ++col) {
+				pixmap[2][row][col] = ((i ^ row) & 0x01) ? 0x55 : 0xAA;
+			}
 		}
 		wait(200);
 	}
diff --git a/display_loop.c b/display_loop.c
index e14107e..2d09c2c 100644
--- a/display_loop.c
+++ b/display_loop.c
@@ -82,7 +82,7 @@ void display_loop(){
 
 #ifdef ANIMATION_SCHACHBRETT
 		case 5:
-			schachbrett(10);
+			schachbrett(20);
 			break;
 #endif