tdf#103927: Share single standard VirtualDevice instance.

To avoid creating excessive amounts of VirtualDevice instances. Also,
since we now have VclPtr, we shouldn't need this bOwnerOfRefDev flag.

Change-Id: I97a6f553a178b32bc173b83a6716185d126f97e1
Reviewed-on: https://gerrit.libreoffice.org/33508
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>

editeng/source/editeng/eerdll.cxx

@@ -70,6 +70,7 @@
 #include <editeng/forbiddencharacterstable.hxx>
 #include <editeng/justifyitem.hxx>
 #include <rtl/instance.hxx>
+#include <tools/mapunit.hxx>
 
 using namespace ::com::sun::star;
 
@@ -83,9 +84,11 @@ EditDLL& EditDLL::Get()
     return theEditDLL::get();
 }
 
-GlobalEditData::GlobalEditData()
+GlobalEditData::GlobalEditData() :
+    ppDefItems(nullptr),
+    mpVirDev(VclPtr<VirtualDevice>::Create())
 {
-    ppDefItems = nullptr;
+    mpVirDev->SetMapMode(MapUnit::MapTwip);
 }
 
 GlobalEditData::~GlobalEditData()
@@ -194,6 +197,11 @@ uno::Reference< linguistic2::XLanguageGuessing > const & GlobalEditData::GetLang
     return xLanguageGuesser;
 }
 
+VclPtr<VirtualDevice> GlobalEditData::GetStdVirtualDevice()
+{
+    return mpVirDev;
+}
+
 EditResId::EditResId(sal_uInt16 nId)
     : ResId(nId, *EditDLL::GetResMgr())
 {

editeng/source/editeng/eerdll2.hxx

@@ -25,6 +25,7 @@
 #include <rtl/ref.hxx>
 
 class SfxPoolItem;
+class VirtualDevice;
 
 class GlobalEditData
 {
@@ -33,6 +34,7 @@ private:
     std::vector<SfxPoolItem*>*   ppDefItems;
 
     rtl::Reference<SvxForbiddenCharactersTable> xForbiddenCharsTable;
+    VclPtr<VirtualDevice> mpVirDev;
 
 public:
                     GlobalEditData();
@@ -43,6 +45,8 @@ public:
     rtl::Reference<SvxForbiddenCharactersTable> const & GetForbiddenCharsTable();
     void            SetForbiddenCharsTable( rtl::Reference<SvxForbiddenCharactersTable> const & xForbiddenChars ) { xForbiddenCharsTable = xForbiddenChars; }
     css::uno::Reference< css::linguistic2::XLanguageGuessing > const & GetLanguageGuesser();
+
+    VclPtr<VirtualDevice> GetStdVirtualDevice();
 };
 
 #endif // INCLUDED_EDITENG_SOURCE_EDITENG_EERDLL2_HXX

editeng/source/editeng/impedit.hxx

@@ -513,7 +513,6 @@ private:
     bool            bIsInUndo:1;
     bool            bUpdate:1;
     bool            bUndoEnabled:1;
-    bool            bOwnerOfRefDev:1;
     bool            bDowning:1;
     bool            bUseAutoColor:1;
     bool            bForceAutoColor:1;

editeng/source/editeng/impedit2.cxx

@@ -95,7 +95,6 @@ ImpEditEngine::ImpEditEngine( EditEngine* pEE, SfxItemPool* pItemPool ) :
     bIsInUndo(false),
     bUpdate(true),
     bUndoEnabled(true),
-    bOwnerOfRefDev(false),
     bDowning(false),
     bUseAutoColor(true),
     bForceAutoColor(false),
@@ -184,26 +183,15 @@ ImpEditEngine::~ImpEditEngine()
     delete mpIMEInfos;
     delete pColorConfig;
     delete pCTLOptions;
-    if ( bOwnerOfRefDev )
-        pRefDev.disposeAndClear();
     delete pSpellInfo;
 }
 
 void ImpEditEngine::SetRefDevice( OutputDevice* pRef )
 {
-    if ( bOwnerOfRefDev )
-        pRefDev.disposeAndClear();
-
-    if ( !pRef )
-    {
-        pRefDev = VclPtr<VirtualDevice>::Create();
-        pRefDev->SetMapMode( MapUnit::MapTwip );
-        bOwnerOfRefDev = true;
-    } else
-    {
+    if (pRef)
         pRefDev = pRef;
-        bOwnerOfRefDev = false;
-    }
+    else
+        pRefDev = EditDLL::Get().GetGlobalData()->GetStdVirtualDevice();
 
     nOnePixelInRef = (sal_uInt16)pRefDev->PixelToLogic( Size( 1, 0 ) ).Width();
 
@@ -219,13 +207,10 @@ void ImpEditEngine::SetRefMapMode( const MapMode& rMapMode )
     if ( GetRefDevice()->GetMapMode() == rMapMode )
         return;
 
-    if ( !bOwnerOfRefDev )
-    {
-        pRefDev = VclPtr<VirtualDevice>::Create();
-        pRefDev->SetMapMode( MapUnit::MapTwip );
-        SetRefDevice( pRefDev );
-        bOwnerOfRefDev = true;
-    }
+    pRefDev = VclPtr<VirtualDevice>::Create();
+    pRefDev->SetMapMode( MapUnit::MapTwip );
+    SetRefDevice( pRefDev );
+
     pRefDev->SetMapMode( rMapMode );
     nOnePixelInRef = (sal_uInt16)pRefDev->PixelToLogic( Size( 1, 0 ) ).Width();
     if ( IsFormatted() )