* expose the XOR function for BRegions (for now called "ExclusiveInclude")

which already existed in the region backend ported from XOrg


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23394 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/Region.h

@@ -66,6 +66,8 @@ class BRegion {
 
 			void				IntersectWith(const BRegion* region);
 
+			void				ExclusiveInclude(const BRegion* region);
+
  private:
 	friend class BDirectWindow;
 	friend class BPrivate::ServerLink;

src/kits/interface/Region.cpp

@@ -414,7 +414,7 @@ BRegion::Exclude(const BRegion* region)
 
 /*!	\brief Modifies the region, so that it will contain just the area
 		in common with the given BRegion.
-	\param region the BRegion to intersect to.
+	\param region the BRegion to intersect with.
 */
 void
 BRegion::IntersectWith(const BRegion* region)
@@ -429,6 +429,23 @@ BRegion::IntersectWith(const BRegion* region)
 // #pragma mark -
 
 
+/*!	\brief Modifies the region, so that it will contain just the area
+		which both regions do not have in common.
+	\param region the BRegion to exclusively include.
+*/
+void
+BRegion::ExclusiveInclude(const BRegion* region)
+{
+	BRegion result;
+	Support::XXorRegion(this, region, &result);
+
+	_AdoptRegionData(result);
+}
+
+
+// #pragma mark -
+
+
 /*!	\brief Takes over the data of a region and marks that region empty.
 	\param region The region to adopt the data from.
 */
@@ -501,6 +518,7 @@ BRegion::_SetSize(long newSize)
 	return true;
 }
 
+
 clipping_rect
 BRegion::_Convert(const BRect& rect) const
 {