minor cleanups.

gfx/src/gtk/nsRegionGTK.cpp

@@ -28,7 +28,7 @@ nsRegionGTK::nsRegionGTK()
 {
   NS_INIT_REFCNT();
   
-  mRegion = ::gdk_region_new();
+  mRegion = nsnull;
   mRegionType = eRegionComplexity_empty;
 }
 
@@ -39,18 +39,16 @@ nsRegionGTK::~nsRegionGTK()
   mRegion = nsnull;
 }
 
-
 NS_IMPL_QUERY_INTERFACE(nsRegionGTK, kRegionIID)
 NS_IMPL_ADDREF(nsRegionGTK)
 NS_IMPL_RELEASE(nsRegionGTK)
 
 nsresult nsRegionGTK::Init(void)
 {
-  if (mRegion)
-    ::gdk_region_destroy(mRegion);
-  mRegion = ::gdk_region_new();  //correct?
+  //NS_ADDREF_THIS();
+  // should this be here?
+  mRegion = ::gdk_region_new();
   mRegionType = eRegionComplexity_empty;
-  
   return NS_OK;
 }
 
@@ -76,7 +74,6 @@ void nsRegionGTK::SetTo(const nsRegionGTK *aRegion)
 
 void nsRegionGTK::SetTo(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight)
 {
-
   SetRegionEmpty();
 
   GdkRectangle grect;
@@ -108,7 +105,6 @@ void nsRegionGTK::Intersect(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHei
   ::gdk_region_destroy(tRegion);
   ::gdk_region_destroy(mRegion);
   mRegion = nRegion;
-
 }
 
 void nsRegionGTK::Union(const nsIRegion &aRegion)
@@ -122,7 +118,6 @@ void nsRegionGTK::Union(const nsIRegion &aRegion)
 
 void nsRegionGTK::Union(PRInt32 aX, PRInt32 aY, PRInt32 aWidth, PRInt32 aHeight)
 {
-
   GdkRegion *tRegion = CreateRectRegion(aX, aY, aWidth, aHeight);
 
   GdkRegion *nRegion = ::gdk_regions_union(mRegion, tRegion);
@@ -282,9 +277,11 @@ NS_IMETHODIMP nsRegionGTK::GetRegionComplexity(nsRegionComplexity &aComplexity)
 
 void nsRegionGTK::SetRegionEmpty()
 {
+  if (!IsEmpty()) {
     ::gdk_region_destroy(mRegion);
     mRegion = ::gdk_region_new();
   }
+}
 
 GdkRegion *nsRegionGTK::CreateRectRegion(PRInt32 aX,
 					 PRInt32 aY,