svx, drawinglayer: handle tools Color <-> BackgroundColorPrimitive2D roundtrip

Change-Id: Ia8c080ef50e1ddbfce17b5c5d357a240edea46f2
(cherry picked from commit b1a9aba3)

drawinglayer/source/processor2d/vclpixelprocessor2d.cxx

@@ -1161,7 +1161,9 @@ namespace drawinglayer
 
                     // create color for fill
                     const basegfx::BColor aPolygonColor(maBColorModifierStack.getModifiedColor(rPrimitive.getBColor()));
-                    mpOutputDevice->SetFillColor(Color(aPolygonColor));
+                    Color aFillColor(aPolygonColor);
+                    aFillColor.SetTransparency(sal_uInt8((rPrimitive.getTransparency() * 255.0) + 0.5));
+                    mpOutputDevice->SetFillColor(aFillColor);
                     mpOutputDevice->SetLineColor();
 
                     // create rectangle for fill

svx/source/sdr/contact/viewobjectcontactofsdrpage.cxx

@@ -142,7 +142,7 @@ drawinglayer::primitive2d::Primitive2DSequence ViewObjectContactOfPageBackground
         // init background with InitColor
         xRetval.realloc(1);
         const basegfx::BColor aRGBColor(aInitColor.getBColor());
-        xRetval[0] = drawinglayer::primitive2d::Primitive2DReference(new drawinglayer::primitive2d::BackgroundColorPrimitive2D(aRGBColor));
+        xRetval[0] = drawinglayer::primitive2d::Primitive2DReference(new drawinglayer::primitive2d::BackgroundColorPrimitive2D(aRGBColor, aInitColor.GetTransparency() / 255.0));
     }
 
     return xRetval;