convert GfxLink::IsEqual to operator==

exactly one use site

Change-Id: Id0a75d46c459be213e81b47aa6c1194c87aec848
Reviewed-on: https://gerrit.libreoffice.org/42891Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

drawinglayer/source/primitive2d/epsprimitive2d.cxx

@@ -60,7 +60,7 @@ namespace drawinglayer
                 const EpsPrimitive2D& rCompare = static_cast<const EpsPrimitive2D&>(rPrimitive);
 
                 return (getEpsTransform() == rCompare.getEpsTransform()
-                    && getGfxLink().IsEqual(rCompare.getGfxLink())
+                    && getGfxLink() == rCompare.getGfxLink()
                     && getMetaFile() == rCompare.getMetaFile());
             }
 

include/vcl/gfxlink.hxx

@@ -83,7 +83,7 @@ public:
                         // pBuff = The Graphic data. This class takes ownership of this
                         GfxLink( std::unique_ptr<sal_uInt8[]> pBuf, sal_uInt32 nBufSize, GfxLinkType nType );
 
-    bool                IsEqual( const GfxLink& ) const;
+    bool                operator==( const GfxLink& ) const;
 
     GfxLinkType         GetType() const { return meType;}
 

vcl/source/gdi/gfxlink.cxx

@@ -41,7 +41,7 @@ GfxLink::GfxLink( std::unique_ptr<sal_uInt8[]> pBuf, sal_uInt32 nSize, GfxLinkTy
     mpSwapInData = std::shared_ptr<sal_uInt8>(pBuf.release(), pBuf.get_deleter());  // std::move(pBuf) does not compile on Jenkins MacOSX (24 May 2016)
 }
 
-bool GfxLink::IsEqual( const GfxLink& rGfxLink ) const
+bool GfxLink::operator==( const GfxLink& rGfxLink ) const
 {
     bool bIsEqual = false;