pass by const reference

Change-Id: I1d1fff8b596d75a4cb033679d06b300402dbf212

chart2/source/view/inc/3DChartObjects.hxx

@@ -108,10 +108,12 @@ private:
 class ScreenText : public Renderable3DObject
 {
 public:
-    ScreenText(OpenGL3DRenderer* pRenderer, TextCache& rTextCache, const OUString& rStr, glm::vec4 rColor, sal_uInt32 nId);
+    ScreenText(OpenGL3DRenderer* pRenderer, TextCache& rTextCache, const OUString& rStr,
+            const glm::vec4& rColor, sal_uInt32 nId);
 
     virtual void render() SAL_OVERRIDE;
-    void setPosition(const glm::vec2& rTopLeft, const glm::vec2& rBottomRight, glm::vec3 r3DPos = glm::vec3(0.0, 0.0, 0.0));
+    void setPosition(const glm::vec2& rTopLeft, const glm::vec2& rBottomRight,
+            const glm::vec3& r3DPos = glm::vec3(0.0, 0.0, 0.0));
 
 private:
     TextCacheItem maText;

chart2/source/view/main/3DChartObjects.cxx

@@ -128,14 +128,16 @@ void Text::setPosition(const glm::vec3& rTopLeft, const glm::vec3& rTopRight, co
     maBottomRight = rBottomRight;
 }
 
-ScreenText::ScreenText(OpenGL3DRenderer* pRenderer, TextCache& rTextCache, const OUString& rStr, glm::vec4 rColor, sal_uInt32 nId):
+ScreenText::ScreenText(OpenGL3DRenderer* pRenderer, TextCache& rTextCache,
+        const OUString& rStr, const glm::vec4& rColor, sal_uInt32 nId):
     Renderable3DObject(pRenderer, nId),
     maText(rTextCache.getText(rStr)),
     maColor(rColor)
 {
 }
 
-void ScreenText::setPosition(const glm::vec2& rTopLeft, const glm::vec2& rBottomRight, glm::vec3 r3DPos)
+void ScreenText::setPosition(const glm::vec2& rTopLeft, const glm::vec2& rBottomRight,
+        const glm::vec3& r3DPos)
 {
     maTopLeft = rTopLeft;
     maBottomRight = rBottomRight;