loplugin:constparams in slideshow

Change-Id: Ifa9fda35020d456338781879df9fba4c0ee535fd
Reviewed-on: https://gerrit.libreoffice.org/40469Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

slideshow/source/engine/animationnodes/animationnodefactory.cxx

@@ -580,7 +580,7 @@ AnimationNodeSharedPtr AnimationNodeFactory::createAnimationNode(
 }
 
 #if defined(DBG_UTIL)
-void AnimationNodeFactory::showTree( AnimationNodeSharedPtr& pRootNode )
+void AnimationNodeFactory::showTree( AnimationNodeSharedPtr const & pRootNode )
 {
     if( pRootNode )
         DEBUG_NODES_SHOWTREE( std::dynamic_pointer_cast<BaseContainerNode>(

slideshow/source/engine/slide/slideimpl.cxx

@@ -274,7 +274,7 @@ private:
 };
 
 
-void slideRenderer( SlideImpl* pSlide, const UnoViewSharedPtr& rView )
+void slideRenderer( SlideImpl const * pSlide, const UnoViewSharedPtr& rView )
 {
     // fully clear view content to background color
     rView->clearAll();

slideshow/source/engine/usereventqueue.cxx

@@ -340,7 +340,7 @@ protected:
         return false; // nothing hit
     }
 
-    bool sendEvent( ImpShapeEventMap::reverse_iterator& io_rHitShape )
+    bool sendEvent( ImpShapeEventMap::reverse_iterator const & io_rHitShape )
     {
         // take next event from queue
         const bool bRet( fireSingleEvent( io_rHitShape->second,

slideshow/source/inc/animationnodefactory.hxx

@@ -50,7 +50,7 @@ namespace slideshow
 
 
 #if defined(DBG_UTIL)
-            void showTree( AnimationNodeSharedPtr& pRootNode );
+            void showTree( AnimationNodeSharedPtr const & pRootNode );
 # define SHOW_NODE_TREE(a) AnimationNodeFactory::showTree(a)
 #else
 # define SHOW_NODE_TREE(a)