fdo#62525: use cow_wrapper for SdrLineAttribute

Change-Id: I62b897bd49ef05a3862cb2cd91c3aa13f621e9fd

drawinglayer/inc/drawinglayer/attribute/sdrlineattribute.hxx

@@ -21,9 +21,9 @@
 #define INCLUDED_DRAWINGLAYER_ATTRIBUTE_SDRLINEATTRIBUTE_HXX
 
 #include <drawinglayer/drawinglayerdllapi.h>
-
 #include <basegfx/vector/b2enums.hxx>
 #include <com/sun/star/drawing/LineCap.hpp>
+#include <o3tl/cow_wrapper.hxx>
 #include <vector>
 
 //////////////////////////////////////////////////////////////////////////////
@@ -45,8 +45,11 @@ namespace drawinglayer
     {
         class DRAWINGLAYER_DLLPUBLIC SdrLineAttribute
         {
+        public:
+            typedef o3tl::cow_wrapper< ImpSdrLineAttribute > ImplType;
+
         private:
-            ImpSdrLineAttribute*                mpSdrLineAttribute;
+            ImplType mpSdrLineAttribute;
 
         public:
             /// constructors/assignmentoperator/destructor

drawinglayer/source/attribute/sdrlineattribute.cxx

@@ -19,6 +19,7 @@
 
 #include <drawinglayer/attribute/sdrlineattribute.hxx>
 #include <basegfx/color/bcolor.hxx>
+#include <rtl/instance.hxx>
 
 //////////////////////////////////////////////////////////////////////////////
 
@@ -29,9 +30,6 @@ namespace drawinglayer
         class ImpSdrLineAttribute
         {
         public:
-            // refcounter
-            sal_uInt32                              mnRefCount;
-
             // line definitions
             basegfx::B2DLineJoin                    meJoin;             // B2DLINEJOIN_* defines
             double                                  mfWidth;            // 1/100th mm, 0.0==hair
@@ -49,8 +47,7 @@ namespace drawinglayer
                 com::sun::star::drawing::LineCap eCap,
                 const ::std::vector< double >& rDotDashArray,
                 double fFullDotDashLen)
-            :   mnRefCount(0),
-                meJoin(eJoin),
+            :   meJoin(eJoin),
                 mfWidth(fWidth),
                 mfTransparence(fTransparence),
                 maColor(rColor),
@@ -61,8 +58,7 @@ namespace drawinglayer
             }
 
             explicit ImpSdrLineAttribute(const basegfx::BColor& rColor)
-            :   mnRefCount(0),
-                meJoin(basegfx::B2DLINEJOIN_NONE),
+            :   meJoin(basegfx::B2DLINEJOIN_NONE),
                 mfWidth(0.0),
                 mfTransparence(0.0),
                 maColor(rColor),
@@ -72,6 +68,17 @@ namespace drawinglayer
             {
             }
 
+            ImpSdrLineAttribute()
+            :   meJoin(basegfx::B2DLINEJOIN_ROUND),
+                mfWidth(0.0),
+                mfTransparence(0.0),
+                maColor(basegfx::BColor()),
+                meCap(com::sun::star::drawing::LineCap_BUTT),
+                maDotDashArray(std::vector< double >()),
+                mfFullDotDashLen(0.0)
+            {
+            }
+
             // data read access
             basegfx::B2DLineJoin getJoin() const { return meJoin; }
             double getWidth() const { return mfWidth; }
@@ -90,29 +97,13 @@ namespace drawinglayer
                     && getCap() == rCandidate.getCap()
                     && getDotDashArray() == rCandidate.getDotDashArray());
             }
+        };
 
-            static ImpSdrLineAttribute* get_global_default()
-            {
-                static ImpSdrLineAttribute* pDefault = 0;
-
-                if(!pDefault)
+        namespace
         {
-                    pDefault = new ImpSdrLineAttribute(
-                        basegfx::B2DLINEJOIN_ROUND,
-                        0.0,
-                        0.0,
-                        basegfx::BColor(),
-                        com::sun::star::drawing::LineCap_BUTT,
-                        std::vector< double >(),
-                        0.0);
-
-                    // never delete; start with RefCount 1, not 0
-                    pDefault->mnRefCount++;
-                }
-
-                return pDefault;
+            struct theGlobalDefault :
+                public rtl::Static< SdrLineAttribute::ImplType, theGlobalDefault > {};
         }
-        };
 
         SdrLineAttribute::SdrLineAttribute(
             basegfx::B2DLineJoin eJoin,
@@ -123,7 +114,7 @@ namespace drawinglayer
             const ::std::vector< double >& rDotDashArray,
             double fFullDotDashLen)
         :   mpSdrLineAttribute(
-                new ImpSdrLineAttribute(
+                ImpSdrLineAttribute(
                     eJoin,
                     fWidth,
                     fTransparence,
@@ -136,67 +127,33 @@ namespace drawinglayer
         }
 
         SdrLineAttribute::SdrLineAttribute()
-        :   mpSdrLineAttribute(ImpSdrLineAttribute::get_global_default())
+        :   mpSdrLineAttribute(theGlobalDefault::get())
         {
-            mpSdrLineAttribute->mnRefCount++;
         }
 
         SdrLineAttribute::SdrLineAttribute(const SdrLineAttribute& rCandidate)
         :   mpSdrLineAttribute(rCandidate.mpSdrLineAttribute)
         {
-            mpSdrLineAttribute->mnRefCount++;
         }
 
         SdrLineAttribute::~SdrLineAttribute()
         {
-            if(mpSdrLineAttribute->mnRefCount)
-            {
-                mpSdrLineAttribute->mnRefCount--;
-            }
-            else
-            {
-                delete mpSdrLineAttribute;
-            }
         }
 
         bool SdrLineAttribute::isDefault() const
         {
-            return mpSdrLineAttribute == ImpSdrLineAttribute::get_global_default();
+            return mpSdrLineAttribute.same_object(theGlobalDefault::get());
         }
 
         SdrLineAttribute& SdrLineAttribute::operator=(const SdrLineAttribute& rCandidate)
         {
-            if(rCandidate.mpSdrLineAttribute != mpSdrLineAttribute)
-            {
-                if(mpSdrLineAttribute->mnRefCount)
-                {
-                    mpSdrLineAttribute->mnRefCount--;
-                }
-                else
-                {
-                    delete mpSdrLineAttribute;
-                }
-
             mpSdrLineAttribute = rCandidate.mpSdrLineAttribute;
-                mpSdrLineAttribute->mnRefCount++;
-            }
-
             return *this;
         }
 
         bool SdrLineAttribute::operator==(const SdrLineAttribute& rCandidate) const
         {
-            if(rCandidate.mpSdrLineAttribute == mpSdrLineAttribute)
-            {
-                return true;
-            }
-
-            if(rCandidate.isDefault() != isDefault())
-            {
-                return false;
-            }
-
-            return (*rCandidate.mpSdrLineAttribute == *mpSdrLineAttribute);
+            return rCandidate.mpSdrLineAttribute == mpSdrLineAttribute;
         }
 
         basegfx::B2DLineJoin SdrLineAttribute::getJoin() const