#i120096# Detect empty polygon in Region constructor and set impl object accordingly.

Reported by: Du Jing
Fixed by: Andre Fischer

vcl/inc/vcl/region.hxx

@@ -61,6 +61,7 @@ private:
     SAL_DLLPRIVATE void             ImplCopyData();
     SAL_DLLPRIVATE void             ImplCreateRectRegion( const Rectangle& rRect );
     SAL_DLLPRIVATE void             ImplCreatePolyPolyRegion( const PolyPolygon& rPolyPoly );
+    SAL_DLLPRIVATE void             ImplCreatePolyPolyRegion( const basegfx::B2DPolyPolygon& rPolyPoly );
     SAL_DLLPRIVATE void             ImplPolyPolyRegionToBandRegionFunc();
     SAL_DLLPRIVATE inline void      ImplPolyPolyRegionToBandRegion();
     SAL_DLLPRIVATE const ImplRegion*    ImplGetImplRegion() const { return mpImplRegion; }

vcl/source/gdi/region.cxx

@@ -1136,7 +1136,7 @@ Region::Region( const basegfx::B2DPolyPolygon& rPolyPoly )
     DBG_CTOR( Region, ImplDbgTestRegion );
     DBG_CHKOBJ( &rPolyPoly, PolyPolygon, NULL );
 
-    mpImplRegion = new ImplRegion( rPolyPoly );
+    ImplCreatePolyPolyRegion( rPolyPoly );
 }
 
 // -----------------------------------------------------------------------
@@ -1226,6 +1226,16 @@ void Region::ImplCreatePolyPolyRegion( const PolyPolygon& rPolyPoly )
 
 // -----------------------------------------------------------------------
 
+void Region::ImplCreatePolyPolyRegion( const basegfx::B2DPolyPolygon& rPolyPoly )
+{
+    if (rPolyPoly.count()==0 || rPolyPoly.getB2DRange().isEmpty())
+        mpImplRegion = (ImplRegion*)(&aImplEmptyRegion);
+    else
+        mpImplRegion = new ImplRegion( rPolyPoly );
+}
+
+// -----------------------------------------------------------------------
+
 void Region::ImplPolyPolyRegionToBandRegionFunc()
 {
     // ensure to subdivide when bezier segemnts are used, it's going to