From c43053605ff5b90f66437a5f11a27ad44c767eb1 Mon Sep 17 00:00:00 2001
From: Qingping Hou <dave2008713@gmail.com>
Date: Mon, 18 Feb 2013 00:15:30 +0800
Subject: [PATCH] fix bug in getPitch, returning half of ptich for 4bpp fb

---
 einkfb.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/einkfb.c b/einkfb.c
index efb61cd0c..b5a3bf50b 100644
--- a/einkfb.c
+++ b/einkfb.c
@@ -281,11 +281,9 @@ static int getSize(lua_State *L) {
 
 static int getPitch(lua_State *L) {
 	FBInfo *fb = (FBInfo*) luaL_checkudata(L, 1, "einkfb");
-#ifndef EMULATE_READER
-	lua_pushinteger(L, fb->finfo.line_length/2);
-#else
+	/* for 8bpp devices, the pitch here is line_length/2, not
+	 * the original pitch, i.e. fb->real_buf->pitch */
 	lua_pushinteger(L, fb->buf->pitch);
-#endif
 	return 1;
 }