tdf#39593 deduplicate code in ScOutputData

Change-Id: Ic709739c75b7305757b2e1985765497985a0b8b6
Reviewed-on: https://gerrit.libreoffice.org/45106Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>

sc/source/ui/inc/output.hxx

@@ -57,6 +57,7 @@ class SdrPaintWindow;
 enum ScOutputType { OUTTYPE_WINDOW, OUTTYPE_PRINTER };
 
 class ScFieldEditEngine;
+class ClearableClipRegion;
 
 class ScOutputData
 {
@@ -247,8 +248,8 @@ private:
     void ShowClipMarks( DrawEditParam& rParam, long nEngineHeight, const Size& aCellSize,
                         bool bMerged, OutputAreaParam& aAreaParam );
 
-    bool Clip( DrawEditParam& rParam, const Size& aCellSize, OutputAreaParam& aAreaParam,
-               long nEngineHeight, bool bWrapFields);
+    std::unique_ptr<ClearableClipRegion> Clip( DrawEditParam& rParam, const Size& aCellSize, OutputAreaParam& aAreaParam,
+                                               long nEngineHeight, bool bWrapFields );
 
     bool AdjustAreaParamClipRect(OutputAreaParam& rAreaParam);