From 75b9dc907b332d64d074083cae0c6b099960f09b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel@tungstengraphics.com>
Date: Thu, 27 Sep 2007 13:08:41 +0200
Subject: [PATCH] EXA: Make sure tile offsets passed to drivers are never
 negative.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Thanks to Björn Steinbrink for pointing out the problem on IRC.

(cherry picked from commit 006f6525057970a74382132237b2131286ad147c with
 modifications.)
---
 exa/exa_accel.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/exa/exa_accel.c b/exa/exa_accel.c
index acc5dbee3..aed4e421c 100644
--- a/exa/exa_accel.c
+++ b/exa/exa_accel.c
@@ -1187,7 +1187,8 @@ exaFillRegionTiled (DrawablePtr	pDrawable,
 	    int dstY = pBox->y1;
 	    int tileY;
 
-	    tileY = (dstY - pDrawable->y - pPatOrg->y) % tileHeight;
+	    modulus(dstY - pDrawable->y - pPatOrg->y, tileHeight, tileY);
+
 	    while (height > 0) {
 		int width = pBox->x2 - pBox->x1;
 		int dstX = pBox->x1;
@@ -1198,7 +1199,8 @@ exaFillRegionTiled (DrawablePtr	pDrawable,
 		    h = height;
 		height -= h;
 
-		tileX = (dstX - pDrawable->x - pPatOrg->x) % tileWidth;
+		modulus(dstX - pDrawable->x - pPatOrg->x, tileWidth, tileX);
+
 		while (width > 0) {
 		    int w = tileWidth - tileX;
 		    if (w > width)