commit e1ac9c0e7a6167f14cb7899e585eeae74bb5d55d
Author: Michel Dänzer <michel@tungstengraphics.com>
Date:   Thu Sep 27 13:08:41 2007 +0200

    EXA: Make sure tile offsets passed to drivers are never negative.
    
    Thanks to Björn Steinbrink for pointing out the problem on IRC.

diff --git a/exa/exa_accel.c b/exa/exa_accel.c
index cc383cc..d19e3f4 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)