From 2eb00c0bd342bfa2373d21e06bf88dfcc7df35f5 Mon Sep 17 00:00:00 2001
From: tron <tron@openttd.org>
Date: Mon, 1 Nov 2004 15:08:40 +0000
Subject: (svn r499) Merge r498 to trunk:   Disabled buttons flicker no more  
 This solves bug report 991101

---
 gfx.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

(limited to 'gfx.c')

diff --git a/gfx.c b/gfx.c
index 4a877328f..aa208b7fc 100644
--- a/gfx.c
+++ b/gfx.c
@@ -115,6 +115,8 @@ void GfxScroll(int left, int top, int width, int height, int xo, int yo) {
 void GfxFillRect(int left, int top, int right, int bottom, int color) {
 	DrawPixelInfo *dpi = _cur_dpi;
 	byte *dst,*ctab;
+	const int otop = top;
+	const int oleft = left;
 
 	if (dpi->zoom != 0)
 		return;
@@ -159,15 +161,13 @@ void GfxFillRect(int left, int top, int right, int bottom, int color) {
 			} while (--bottom);
 		}
 	} else {
-		byte bo = 0;
+		byte bo = (oleft - left + dpi->left + otop - top + dpi->top) & 1;
 		do {
 			int i;
-			byte b = (bo^=1);
-			for(i=0; i!=right;i++)
-				if ((b^=1) != 0)
-					dst[i] = (byte)color;
+			for (i = (bo ^= 1); i < right; i += 2)
+				dst[i] = (byte)color;
 			dst += dpi->pitch;
-		} while (--bottom);
+		} while (--bottom > 0);
 	}
 }
 
-- 
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