Modify ImpGraphic class, GraphicReader context to use unique ptr

Change-Id: I51c3995f4a6e940a5235524eb94dd356b27ae8d7
Reviewed-on: https://gerrit.libreoffice.org/26955
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

8 files changed, 61 insertions, 72 deletions

diff --git a/vcl/inc/impgraph.hxx b/vcl/inc/impgraph.hxx
index bb67c66522fd..817b9cf9b4f4 100644
--- a/vcl/inc/impgraph.hxx
+++ b/vcl/inc/impgraph.hxx
@@ -41,7 +41,7 @@ private:
     BitmapEx                     maEx;
     ImpSwapInfo                  maSwapInfo;
     std::unique_ptr<Animation>   mpAnimation;
-    GraphicReader*               mpContext;
+    std::shared_ptr<GraphicReader> mpContext;
     std::shared_ptr<ImpSwapFile> mpSwapFile;
     std::unique_ptr<GfxLink>     mpGfxLink;
     GraphicType                  meType;
@@ -114,8 +114,8 @@ private:
 
 private:
 
-    GraphicReader*      ImplGetContext() { return mpContext;}
-    void                ImplSetContext( GraphicReader* pReader );
+    std::shared_ptr<GraphicReader>& ImplGetContext() { return mpContext;}
+    void                ImplSetContext( const std::shared_ptr<GraphicReader>& pReader );
     void                ImplSetDummyContext( bool value ) { mbDummyContext = value; }
     bool                ImplReadEmbedded( SvStream& rIStream );
     bool                ImplWriteEmbedded( SvStream& rOStream );
diff --git a/vcl/source/filter/graphicfilter.cxx b/vcl/source/filter/graphicfilter.cxx
index b65a8a02ea78..27fb8a20a23b 100644
--- a/vcl/source/filter/graphicfilter.cxx
+++ b/vcl/source/filter/graphicfilter.cxx
@@ -1330,17 +1330,17 @@ sal_uInt16 GraphicFilter::ImportGraphic( Graphic& rGraphic, const OUString& rPat
                                      css::uno::Sequence< css::beans::PropertyValue >* pFilterData,
                                      WMF_EXTERNALHEADER *pExtHeader )
 {
-    OUString                aFilterName;
-    OUString                aExternalFilterName;
-    sal_uLong               nStreamBegin;
-    sal_uInt16              nStatus;
-    GraphicReader*          pContext = rGraphic.GetContext();
-    GfxLinkType             eLinkType = GfxLinkType::NONE;
-    bool                    bDummyContext = rGraphic.IsDummyContext();
-    const bool              bLinkSet = rGraphic.IsLink();
-    FilterConfigItem*       pFilterConfigItem = nullptr;
-
-    Size                    aPreviewSizeHint( 0, 0 );
+    OUString                       aFilterName;
+    OUString                       aExternalFilterName;
+    sal_uLong                      nStreamBegin;
+    sal_uInt16                     nStatus;
+    std::shared_ptr<GraphicReader> pContext = rGraphic.GetContext();
+    GfxLinkType                    eLinkType = GfxLinkType::NONE;
+    bool                           bDummyContext = rGraphic.IsDummyContext();
+    const bool                     bLinkSet = rGraphic.IsLink();
+    FilterConfigItem*              pFilterConfigItem = nullptr;
+
+    Size                aPreviewSizeHint( 0, 0 );
     bool                bAllowPartialStreamRead = false;
     bool                bCreateNativeLink = true;
 
diff --git a/vcl/source/filter/igif/gifread.cxx b/vcl/source/filter/igif/gifread.cxx
index 0609314924c7..47fbce964ee0 100644
--- a/vcl/source/filter/igif/gifread.cxx
+++ b/vcl/source/filter/igif/gifread.cxx
@@ -885,18 +885,21 @@ ReadState GIFReader::ReadGIF( Graphic& rGraphic )
 
 VCL_DLLPUBLIC bool ImportGIF( SvStream & rStm, Graphic& rGraphic )
 {
-    std::unique_ptr<GIFReader>  xGIFReader(static_cast<GIFReader*>(rGraphic.GetContext()));
+    std::shared_ptr<GraphicReader> pContext = rGraphic.GetContext();
     rGraphic.SetContext(nullptr);
+    GIFReader* pGIFReader = dynamic_cast<GIFReader*>( pContext.get() );
+    if (!pGIFReader)
+    {
+        pContext = std::make_shared<GIFReader>( rStm );
+        pGIFReader = static_cast<GIFReader*>( pContext.get() );
+    }
 
     SvStreamEndian nOldFormat = rStm.GetEndian();
     rStm.SetEndian( SvStreamEndian::LITTLE );
 
-    if (!xGIFReader)
-        xGIFReader.reset(new GIFReader(rStm));
-
     bool bRet = true;
 
-    ReadState eReadState = xGIFReader->ReadGIF(rGraphic);
+    ReadState eReadState = pGIFReader->ReadGIF(rGraphic);
 
     if (eReadState == GIFREAD_ERROR)
     {
@@ -904,8 +907,8 @@ VCL_DLLPUBLIC bool ImportGIF( SvStream & rStm, Graphic& rGraphic )
     }
     else if (eReadState == GIFREAD_NEED_MORE)
     {
-        rGraphic = xGIFReader->GetIntermediateGraphic();
-        rGraphic.SetContext(xGIFReader.release());
+        rGraphic = pGIFReader->GetIntermediateGraphic();
+        rGraphic.SetContext(pContext);
     }
 
     rStm.SetEndian(nOldFormat);
diff --git a/vcl/source/filter/ixbm/xbmread.cxx b/vcl/source/filter/ixbm/xbmread.cxx
index a8a59a741891..4053f056d53e 100644
--- a/vcl/source/filter/ixbm/xbmread.cxx
+++ b/vcl/source/filter/ixbm/xbmread.cxx
@@ -381,25 +381,25 @@ ReadState XBMReader::ReadXBM( Graphic& rGraphic )
 
 VCL_DLLPUBLIC bool ImportXBM( SvStream& rStm, Graphic& rGraphic )
 {
-    XBMReader*  pXBMReader = static_cast<XBMReader*>( rGraphic.GetContext() );
-    ReadState   eReadState;
-    bool        bRet = true;
+    std::shared_ptr<GraphicReader> pContext = rGraphic.GetContext();
+    rGraphic.SetContext(nullptr);
+    XBMReader* pXBMReader = dynamic_cast<XBMReader*>( pContext.get() );
+    if (!pXBMReader)
+    {
+        pContext = std::make_shared<XBMReader>( rStm );
+        pXBMReader = static_cast<XBMReader*>( pContext.get() );
+    }
 
-    if( !pXBMReader )
-        pXBMReader = new XBMReader( rStm );
+    bool bRet = true;
 
-    rGraphic.SetContext( nullptr );
-    eReadState = pXBMReader->ReadXBM( rGraphic );
+    ReadState eReadState = pXBMReader->ReadXBM( rGraphic );
 
     if( eReadState == XBMREAD_ERROR )
     {
         bRet = false;
-        delete pXBMReader;
     }
-    else if( eReadState == XBMREAD_OK )
-        delete pXBMReader;
-    else
-        rGraphic.SetContext( pXBMReader );
+    else if( eReadState == XBMREAD_NEED_MORE )
+        rGraphic.SetContext( pContext );
 
     return bRet;
 }
diff --git a/vcl/source/filter/ixpm/xpmread.cxx b/vcl/source/filter/ixpm/xpmread.cxx
index ef4ef3d1d953..382efb7f3769 100644
--- a/vcl/source/filter/ixpm/xpmread.cxx
+++ b/vcl/source/filter/ixpm/xpmread.cxx
@@ -723,25 +723,25 @@ bool XPMReader::ImplGetString()
 
 VCL_DLLPUBLIC bool ImportXPM( SvStream& rStm, Graphic& rGraphic )
 {
-    XPMReader*  pXPMReader = static_cast<XPMReader*>(rGraphic.GetContext());
-    ReadState   eReadState;
-    bool        bRet = true;
+    std::shared_ptr<GraphicReader> pContext = rGraphic.GetContext();
+    rGraphic.SetContext(nullptr);
+    XPMReader* pXPMReader = dynamic_cast<XPMReader*>( pContext.get() );
+    if (!pXPMReader)
+    {
+        pContext = std::make_shared<XPMReader>( rStm );
+        pXPMReader = static_cast<XPMReader*>( pContext.get() );
+    }
 
-    if( !pXPMReader )
-        pXPMReader = new XPMReader( rStm );
+    bool bRet = true;
 
-    rGraphic.SetContext( nullptr );
-    eReadState = pXPMReader->ReadXPM( rGraphic );
+    ReadState eReadState = pXPMReader->ReadXPM( rGraphic );
 
     if( eReadState == XPMREAD_ERROR )
     {
         bRet = false;
-        delete pXPMReader;
     }
-    else if( eReadState == XPMREAD_OK )
-        delete pXPMReader;
-    else
-        rGraphic.SetContext( pXPMReader );
+    else if( eReadState == XPMREAD_NEED_MORE )
+        rGraphic.SetContext( pContext );
 
     return bRet;
 }
diff --git a/vcl/source/filter/jpeg/jpeg.cxx b/vcl/source/filter/jpeg/jpeg.cxx
index c3769870aa3f..ca780f1c6bcc 100644
--- a/vcl/source/filter/jpeg/jpeg.cxx
+++ b/vcl/source/filter/jpeg/jpeg.cxx
@@ -27,14 +27,15 @@
 
 VCL_DLLPUBLIC bool ImportJPEG( SvStream& rInputStream, Graphic& rGraphic, void* pCallerData, GraphicFilterImportFlags nImportFlags )
 {
-    ReadState   eReadState;
     bool        bReturn = true;
 
-    JPEGReader* pJPEGReader = static_cast<JPEGReader*>( rGraphic.GetContext() );
-
-    if( !pJPEGReader )
+    std::shared_ptr<GraphicReader> pContext = rGraphic.GetContext();
+    rGraphic.SetContext(nullptr);
+    JPEGReader* pJPEGReader = dynamic_cast<JPEGReader*>( pContext.get() );
+    if (!pJPEGReader)
     {
-        pJPEGReader = new JPEGReader( rInputStream, pCallerData, bool( nImportFlags & GraphicFilterImportFlags::SetLogsizeForJpeg ) );
+        pContext = std::make_shared<JPEGReader>( rInputStream, pCallerData, bool( nImportFlags & GraphicFilterImportFlags::SetLogsizeForJpeg ) );
+        pJPEGReader = static_cast<JPEGReader*>( pContext.get() );
     }
 
     if( nImportFlags & GraphicFilterImportFlags::ForPreview )
@@ -46,21 +47,15 @@ VCL_DLLPUBLIC bool ImportJPEG( SvStream& rInputStream, Graphic& rGraphic, void*
         pJPEGReader->DisablePreviewMode();
     }
 
-    rGraphic.SetContext( nullptr );
-    eReadState = pJPEGReader->Read( rGraphic );
+    ReadState eReadState = pJPEGReader->Read( rGraphic );
 
     if( eReadState == JPEGREAD_ERROR )
     {
         bReturn = false;
-        delete pJPEGReader;
-    }
-    else if( eReadState == JPEGREAD_OK )
-    {
-        delete pJPEGReader;
     }
-    else
+    else if( eReadState == JPEGREAD_NEED_MORE )
     {
-        rGraphic.SetContext( pJPEGReader );
+        rGraphic.SetContext( pContext );
     }
 
     return bReturn;
diff --git a/vcl/source/gdi/graph.cxx b/vcl/source/gdi/graph.cxx
index 7a61594e1b42..67511af59297 100644
--- a/vcl/source/gdi/graph.cxx
+++ b/vcl/source/gdi/graph.cxx
@@ -496,12 +496,12 @@ sal_uLong Graphic::GetAnimationLoopCount() const
     return mpImpGraphic->ImplGetAnimationLoopCount();
 }
 
-GraphicReader* Graphic::GetContext()
+std::shared_ptr<GraphicReader>& Graphic::GetContext()
 {
     return mpImpGraphic->ImplGetContext();
 }
 
-void Graphic::SetContext( GraphicReader* pReader )
+void Graphic::SetContext( const std::shared_ptr<GraphicReader> &pReader )
 {
     mpImpGraphic->ImplSetContext( pReader );
 }
diff --git a/vcl/source/gdi/impgraph.cxx b/vcl/source/gdi/impgraph.cxx
index 5478305f6397..4d7a14fe64b3 100644
--- a/vcl/source/gdi/impgraph.cxx
+++ b/vcl/source/gdi/impgraph.cxx
@@ -95,7 +95,6 @@ Size GraphicReader::GetPreviewSize() const
 }
 
 ImpGraphic::ImpGraphic() :
-        mpContext       ( nullptr ),
         meType          ( GraphicType::NONE ),
         mnSizeBytes     ( 0UL ),
         mnRefCount      ( 1UL ),
@@ -108,7 +107,6 @@ ImpGraphic::ImpGraphic() :
 ImpGraphic::ImpGraphic( const ImpGraphic& rImpGraphic ) :
         maMetaFile      ( rImpGraphic.maMetaFile ),
         maEx            ( rImpGraphic.maEx ),
-        mpContext       ( nullptr ),
         mpSwapFile      ( rImpGraphic.mpSwapFile ),
         meType          ( rImpGraphic.meType ),
         mnSizeBytes     ( rImpGraphic.mnSizeBytes ),
@@ -132,7 +130,6 @@ ImpGraphic::ImpGraphic( const ImpGraphic& rImpGraphic ) :
 
 ImpGraphic::ImpGraphic( const Bitmap& rBitmap ) :
         maEx            ( rBitmap ),
-        mpContext       ( nullptr ),
         meType          ( !rBitmap.IsEmpty() ? GraphicType::Bitmap : GraphicType::NONE ),
         mnSizeBytes     ( 0UL ),
         mnRefCount      ( 1UL ),
@@ -144,7 +141,6 @@ ImpGraphic::ImpGraphic( const Bitmap& rBitmap ) :
 
 ImpGraphic::ImpGraphic( const BitmapEx& rBitmapEx ) :
         maEx            ( rBitmapEx ),
-        mpContext       ( nullptr ),
         meType          ( !rBitmapEx.IsEmpty() ? GraphicType::Bitmap : GraphicType::NONE ),
         mnSizeBytes     ( 0UL ),
         mnRefCount      ( 1UL ),
@@ -155,8 +151,7 @@ ImpGraphic::ImpGraphic( const BitmapEx& rBitmapEx ) :
 }
 
 ImpGraphic::ImpGraphic(const SvgDataPtr& rSvgDataPtr)
-:   mpContext( nullptr ),
-    meType( rSvgDataPtr.get() ? GraphicType::Bitmap : GraphicType::NONE ),
+:   meType( rSvgDataPtr.get() ? GraphicType::Bitmap : GraphicType::NONE ),
     mnSizeBytes( 0UL ),
     mnRefCount( 1UL ),
     mbSwapOut( false ),
@@ -169,7 +164,6 @@ ImpGraphic::ImpGraphic(const SvgDataPtr& rSvgDataPtr)
 ImpGraphic::ImpGraphic( const Animation& rAnimation ) :
         maEx            ( rAnimation.GetBitmapEx() ),
         mpAnimation     ( o3tl::make_unique<Animation>( rAnimation ) ),
-        mpContext       ( nullptr ),
         meType          ( GraphicType::Bitmap ),
         mnSizeBytes     ( 0UL ),
         mnRefCount      ( 1UL ),
@@ -181,7 +175,6 @@ ImpGraphic::ImpGraphic( const Animation& rAnimation ) :
 
 ImpGraphic::ImpGraphic( const GDIMetaFile& rMtf ) :
         maMetaFile      ( rMtf ),
-        mpContext       ( nullptr ),
         meType          ( GraphicType::GdiMetafile ),
         mnSizeBytes     ( 0UL ),
         mnRefCount      ( 1UL ),
@@ -194,7 +187,6 @@ ImpGraphic::ImpGraphic( const GDIMetaFile& rMtf ) :
 ImpGraphic::~ImpGraphic()
 {
     ImplClear();
-    delete mpContext;
 }
 
 ImpGraphic& ImpGraphic::operator=( const ImpGraphic& rImpGraphic )
@@ -908,9 +900,8 @@ sal_uLong ImpGraphic::ImplGetAnimationLoopCount() const
 }
 
 
-void ImpGraphic::ImplSetContext( GraphicReader* pReader )
+void ImpGraphic::ImplSetContext( const std::shared_ptr<GraphicReader>& pReader )
 {
-    assert(!mpContext);
     mpContext = pReader;
     mbDummyContext = false;
 }