Simplify GfxLink using std::shared_ptr to clarify ownership

The functionality has not changed in this class, however the ABI
has changed (this class is DLL Public)

Change-Id: I11005f03e747d56cb59550e071755429390db7a7
Reviewed-on: https://gerrit.libreoffice.org/25081Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

include/vcl/gfxlink.hxx

@@ -25,56 +25,10 @@
 #include <tools/solar.h>
 #include <vcl/dllapi.h>
 #include <vcl/mapmod.hxx>
+#include <memory>
 
 class SvStream;
 
-
-struct ImpBuffer
-{
-    sal_uLong       mnRefCount;
-    sal_uInt8*      mpBuffer;
-
-                ImpBuffer( sal_uInt8* pBuf ) { mnRefCount = 1UL; mpBuffer = pBuf; }
-
-                ~ImpBuffer() { delete[] mpBuffer; }
-};
-
-
-struct ImpSwap
-{
-    OUString   maURL;
-    sal_uLong           mnDataSize;
-    sal_uLong           mnRefCount;
-
-                    ImpSwap( sal_uInt8* pData, sal_uLong nDataSize );
-                    ~ImpSwap();
-
-    sal_uInt8*          GetData() const;
-
-    bool            IsSwapped() const { return maURL.getLength() > 0; }
-
-    void            WriteTo( SvStream& rOStm ) const;
-};
-
-
-struct ImpGfxLink
-{
-    MapMode         maPrefMapMode;
-    Size            maPrefSize;
-    bool            mbPrefMapModeValid;
-    bool            mbPrefSizeValid;
-
-    ImpGfxLink() :
-        maPrefMapMode(),
-        maPrefSize(),
-        mbPrefMapModeValid( false ),
-        mbPrefSizeValid( false )
-    {}
-};
-
-//#endif // __PRIVATE
-
-
 enum GfxLinkType
 {
     GFX_LINK_TYPE_NONE          = 0,
@@ -88,7 +42,6 @@ enum GfxLinkType
     GFX_LINK_TYPE_NATIVE_PCT    = 8,    // Don't forget to update the following defines
     GFX_LINK_TYPE_NATIVE_SVG    = 9,    // Don't forget to update the following defines
     GFX_LINK_TYPE_NATIVE_MOV    = 10,   // Don't forget to update the following defines
-    // #i15508# added BMP type support
     GFX_LINK_TYPE_NATIVE_BMP    = 11,   // Don't forget to update the following defines
     GFX_LINK_TYPE_USER          = 0xffff
 };
@@ -96,49 +49,58 @@ enum GfxLinkType
 #define GFX_LINK_FIRST_NATIVE_ID    GFX_LINK_TYPE_NATIVE_GIF
 #define GFX_LINK_LAST_NATIVE_ID     GFX_LINK_TYPE_NATIVE_BMP
 
-
-struct ImpBuffer;
-struct ImpSwap;
-struct ImpGfxLink;
 class Graphic;
 
 class VCL_DLLPUBLIC GfxLink
 {
 private:
 
-    GfxLinkType         meType;
-    ImpBuffer*          mpBuf;
-    ImpSwap*            mpSwap;
-    sal_uInt32          mnBufSize;
-    sal_uInt32          mnUserId;
-    ImpGfxLink*         mpImpData;
+    struct SwapOutData
+    {
+        SwapOutData(const OUString &aURL);
+        ~SwapOutData();
 
-    SAL_DLLPRIVATE void ImplCopy( const GfxLink& rGfxLink );
+        OUString maURL; // File is removed in the destructor
 
+    };
+
+    GfxLinkType     meType = GFX_LINK_TYPE_NONE;
+    sal_uInt32      mnUserId = 0;
+
+    std::shared_ptr<sal_uInt8> mpSwapInData;
+    std::shared_ptr<SwapOutData> mpSwapOutData;
+
+    sal_uInt32      mnSwapInDataSize = 0;
+    MapMode         maPrefMapMode;
+    Size            maPrefSize;
+    bool            mbPrefMapModeValid = false;
+    bool            mbPrefSizeValid = false;
+
+    SAL_DLLPRIVATE std::shared_ptr<sal_uInt8> GetSwapInData() const;
 public:
                         GfxLink();
-                        GfxLink( const GfxLink& );
+
+                        // pBuff = The Graphic data. This class takes ownership of this
                         GfxLink( sal_uInt8* pBuf, sal_uInt32 nBufSize, GfxLinkType nType );
                         ~GfxLink();
 
-    GfxLink&            operator=( const GfxLink& );
-    bool            IsEqual( const GfxLink& ) const;
+    bool                IsEqual( const GfxLink& ) const;
 
     GfxLinkType         GetType() const { return meType;}
 
     void                SetUserId( sal_uInt32 nUserId ) { mnUserId = nUserId; }
     sal_uInt32          GetUserId() const { return mnUserId; }
 
-    sal_uInt32          GetDataSize() const { return mnBufSize;}
+    sal_uInt32          GetDataSize() const { return mnSwapInDataSize;}
     const sal_uInt8*    GetData() const;
 
-    const Size&         GetPrefSize() const { return mpImpData->maPrefSize;}
+    const Size&         GetPrefSize() const { return maPrefSize;}
     void                SetPrefSize( const Size& rPrefSize );
-    bool                IsPrefSizeValid() { return mpImpData->mbPrefSizeValid;}
+    bool                IsPrefSizeValid() { return mbPrefSizeValid;}
 
-    const MapMode&      GetPrefMapMode() const { return mpImpData->maPrefMapMode;}
+    const MapMode&      GetPrefMapMode() const { return maPrefMapMode;}
     void                SetPrefMapMode( const MapMode& rPrefMapMode );
-    bool                IsPrefMapModeValid() { return mpImpData->mbPrefMapModeValid;}
+    bool                IsPrefMapModeValid() { return mbPrefMapModeValid;}
 
     bool                IsNative() const;
 
@@ -148,7 +110,7 @@ public:
 
     void                SwapOut();
     void                SwapIn();
-    bool                IsSwappedOut() const { return( mpSwap != nullptr ); }
+    bool                IsSwappedOut() const { return( bool(mpSwapOutData) ); }
 
 public: