loplugin:passstuffbyref in drawinglayer

Change-Id: I563c18c35291ced91bc29ab9162c5363ee8b19f9

include/drawinglayer/primitive3d/groupprimitive3d.hxx

@@ -59,7 +59,7 @@ namespace drawinglayer
             explicit GroupPrimitive3D(const Primitive3DContainer& rChildren);
 
             /// data read access
-            Primitive3DContainer getChildren() const { return maChildren; }
+            const Primitive3DContainer& getChildren() const { return maChildren; }
 
             /// compare operator
             virtual bool operator==( const BasePrimitive3D& rPrimitive ) const override;

include/drawinglayer/primitive3d/polygonprimitive3d.hxx

@@ -107,7 +107,7 @@ namespace drawinglayer
                 const attribute::StrokeAttribute& rStrokeAttribute);
 
             /// data read access
-            basegfx::B3DPolygon getB3DPolygon() const { return maPolygon; }
+            const basegfx::B3DPolygon& getB3DPolygon() const { return maPolygon; }
             const attribute::LineAttribute& getLineAttribute() const { return maLineAttribute; }
             const attribute::StrokeAttribute& getStrokeAttribute() const { return maStrokeAttribute; }
 

include/drawinglayer/primitive3d/sdrprimitive3d.hxx

@@ -72,7 +72,7 @@ namespace drawinglayer
             const basegfx::B3DHomMatrix& getTransform() const { return maTransform; }
             const basegfx::B2DVector& getTextureSize() const { return maTextureSize; }
             const attribute::SdrLineFillShadowAttribute3D& getSdrLFSAttribute() const { return maSdrLFSAttribute; }
-            const attribute::Sdr3DObjectAttribute getSdr3DObjectAttribute() const { return maSdr3DObjectAttribute; }
+            const attribute::Sdr3DObjectAttribute& getSdr3DObjectAttribute() const { return maSdr3DObjectAttribute; }
 
             /// compare operator
             virtual bool operator==(const BasePrimitive3D& rPrimitive) const override;