loplugin:useuniqueptr in SdrPaintWindow

Change-Id: Ia5a57913b607c0c055a525094ac03c5c3022abb4
Reviewed-on: https://gerrit.libreoffice.org/53713Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/svx/sdrpaintwindow.hxx

@@ -23,6 +23,7 @@
 #include <rtl/ref.hxx>
 #include <vcl/virdev.hxx>
 #include <svx/svxdllapi.h>
+#include <memory>
 
 class SdrPaintView;
 
@@ -78,7 +79,7 @@ private:
     rtl::Reference< sdr::overlay::OverlayManager >    mxOverlayManager;
 
     // The PreRenderDevice for PreRendering
-    SdrPreRenderDevice*                                 mpPreRenderDevice;
+    std::unique_ptr<SdrPreRenderDevice>               mpPreRenderDevice;
 
     // The RedrawRegion used for rendering
     vcl::Region                                              maRedrawRegion;
@@ -123,7 +124,7 @@ public:
     void PreparePreRenderDevice();
     void DestroyPreRenderDevice();
     void OutputPreRenderDevice(const vcl::Region& rExpandedRegion);
-    SdrPreRenderDevice* GetPreRenderDevice() const { return mpPreRenderDevice; }
+    SdrPreRenderDevice* GetPreRenderDevice() const { return mpPreRenderDevice.get(); }
 
     // RedrawRegion
     const vcl::Region& GetRedrawRegion() const { return maRedrawRegion;}

svx/source/svdraw/sdrpaintwindow.cxx

@@ -292,7 +292,7 @@ void SdrPaintWindow::PreparePreRenderDevice()
     {
         if(!mpPreRenderDevice)
         {
-            mpPreRenderDevice = new SdrPreRenderDevice(*mpOutputDevice.get());
+            mpPreRenderDevice.reset(new SdrPreRenderDevice(*mpOutputDevice));
         }
     }
     else
@@ -308,11 +308,7 @@ void SdrPaintWindow::PreparePreRenderDevice()
 
 void SdrPaintWindow::DestroyPreRenderDevice()
 {
-    if(mpPreRenderDevice)
-    {
-        delete mpPreRenderDevice;
-        mpPreRenderDevice = nullptr;
-    }
+    mpPreRenderDevice.reset();
 }
 
 void SdrPaintWindow::OutputPreRenderDevice(const vcl::Region& rExpandedRegion)