From f368db7eebf764cfe2826a7a3358b779a478c053 Mon Sep 17 00:00:00 2001
From: Kamil Hornicek <kamil.hornicek@reactos.org>
Date: Wed, 22 Feb 2017 10:48:41 +0000
Subject: [PATCH] [NTGDI] - Check for zero rectangles in REGION_bXformRgn.
 CORE-12204

svn path=/trunk/; revision=73881
---
 reactos/win32ss/gdi/ntgdi/region.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/reactos/win32ss/gdi/ntgdi/region.c b/reactos/win32ss/gdi/ntgdi/region.c
index ee79eb23661..8eae7e75402 100644
--- a/reactos/win32ss/gdi/ntgdi/region.c
+++ b/reactos/win32ss/gdi/ntgdi/region.c
@@ -2051,6 +2051,10 @@ REGION_bXformRgn(
     RECT rect;
     BOOL bResult;
 
+    /* Check for zero rectangles and return TRUE for translation only matrices */
+    if (prgn->rdh.nCount < 1)
+        return pmx->flAccel & XFORM_UNITY;
+
     /* Check if this is a scaling only matrix (off-diagonal elements are 0 */
     if (pmx->flAccel & XFORM_SCALE)
     {