vcl: share GfxLink

When importing PDF as images, we store the
PDF stream in the GfxLink. For large PDFs
storing a copy of the full PDF with each
page is overkill. For example a 10MB PDF
with 200 pages will consume 2GB of memory!

Change-Id: I99913514cf5c562683080bc817668095bee69427
Reviewed-on: https://gerrit.libreoffice.org/55571
Tested-by: Jenkins
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/69624Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

sd/source/filter/pdf/sdpdffilter.cxx

@@ -111,7 +111,8 @@ bool SdPdfFilter::Import()
     const size_t nGraphicContentSize = aPdfData.getLength();
     std::unique_ptr<sal_uInt8[]> pGraphicContent(new sal_uInt8[nGraphicContentSize]);
     memcpy(pGraphicContent.get(), aPdfData.get(), nGraphicContentSize);
-    GfxLink aGfxLink(std::move(pGraphicContent), nGraphicContentSize, GfxLinkType::NativePdf);
+    std::shared_ptr<GfxLink> pGfxLink(std::make_shared<GfxLink>(
+        std::move(pGraphicContent), nGraphicContentSize, GfxLinkType::NativePdf));
     auto pPdfData = std::make_shared<uno::Sequence<sal_Int8>>(aPdfData);
 
     mrDocument.CreateFirstPages();

vcl/inc/impgraph.hxx

@@ -45,7 +45,7 @@ private:
     std::unique_ptr<Animation>   mpAnimation;
     std::shared_ptr<GraphicReader> mpContext;
     std::shared_ptr<ImpSwapFile> mpSwapFile;
-    std::unique_ptr<GfxLink>     mpGfxLink;
+    std::shared_ptr<GfxLink>     mpGfxLink;
     GraphicType                  meType;
     mutable sal_uLong            mnSizeBytes;
     bool                         mbSwapOut;
@@ -160,7 +160,7 @@ private:
 
     bool                ImplIsSwapOut() const { return mbSwapOut;}
     bool                ImplIsDummyContext() const { return mbDummyContext; }
-    void                ImplSetLink( const GfxLink& );
+    void                ImplSetLink( const std::shared_ptr<GfxLink>& );
     GfxLink             ImplGetLink();
     bool                ImplIsLink() const;
 

vcl/source/filter/graphicfilter.cxx

@@ -1854,7 +1854,7 @@ ErrCode GraphicFilter::ImportGraphic( Graphic& rGraphic, const OUString& rPath,
         }
         if( nStatus == ERRCODE_NONE )
         {
-            rGraphic.SetLink( GfxLink( std::move(pGraphicContent), nGraphicContentSize, eLinkType ) );
+            rGraphic.SetLink(GfxLink(std::move(pGraphicContent), nGraphicContentSize, eLinkType));
         }
     }
 

vcl/source/gdi/impgraph.cxx

@@ -115,6 +115,7 @@ ImpGraphic::ImpGraphic(const ImpGraphic& rImpGraphic)
     , maSwapInfo(rImpGraphic.maSwapInfo)
     , mpContext(rImpGraphic.mpContext)
     , mpSwapFile(rImpGraphic.mpSwapFile)
+    , mpGfxLink(rImpGraphic.mpGfxLink)
     , meType(rImpGraphic.meType)
     , mnSizeBytes(rImpGraphic.mnSizeBytes)
     , mbSwapOut(rImpGraphic.mbSwapOut)
@@ -124,9 +125,6 @@ ImpGraphic::ImpGraphic(const ImpGraphic& rImpGraphic)
     , maGraphicExternalLink(rImpGraphic.maGraphicExternalLink)
     , mnPageNumber(rImpGraphic.mnPageNumber)
 {
-    if( rImpGraphic.mpGfxLink )
-        mpGfxLink = o3tl::make_unique<GfxLink>( *rImpGraphic.mpGfxLink );
-
     if( rImpGraphic.mpAnimation )
     {
         mpAnimation = o3tl::make_unique<Animation>( *rImpGraphic.mpAnimation );
@@ -239,10 +237,7 @@ ImpGraphic& ImpGraphic::operator=( const ImpGraphic& rImpGraphic )
         mbSwapOut = rImpGraphic.mbSwapOut;
         mpSwapFile = rImpGraphic.mpSwapFile;
 
-        mpGfxLink.reset();
-
-        if( rImpGraphic.mpGfxLink )
-            mpGfxLink = o3tl::make_unique<GfxLink>( *rImpGraphic.mpGfxLink );
+        mpGfxLink = rImpGraphic.mpGfxLink;
 
         maVectorGraphicData = rImpGraphic.maVectorGraphicData;
         mpPdfData = rImpGraphic.mpPdfData;
@@ -1370,11 +1365,11 @@ bool ImpGraphic::ImplSwapIn( SvStream* xIStm )
     return bRet;
 }
 
-void ImpGraphic::ImplSetLink( const GfxLink& rGfxLink )
+void ImpGraphic::ImplSetLink(const GfxLink& rGfxLink)
 {
-    mpGfxLink = o3tl::make_unique<GfxLink>( rGfxLink );
+    mpGfxLink = rGfxLink;
 
-    if( mpGfxLink->IsNative() )
+    if (mpGfxLink && mpGfxLink->IsNative())
         mpGfxLink->SwapOut();
 }
 
@@ -1489,7 +1484,7 @@ void ReadImpGraphic( SvStream& rIStm, ImpGraphic& rImpGraphic )
 
         // set dummy link to avoid creation of additional link after filtering;
         // we set a default link to avoid unnecessary swapping of native data
-        aGraphic.SetLink( GfxLink() );
+        aGraphic.SetLink(GfxLink());
 
         if( !rIStm.GetError() && aLink.LoadNative( aGraphic ) )
         {
@@ -1506,7 +1501,7 @@ void ReadImpGraphic( SvStream& rIStm, ImpGraphic& rImpGraphic )
                 rImpGraphic.ImplSetPrefSize( aLink.GetPrefSize() );
 
             if( bSetLink )
-                rImpGraphic.ImplSetLink( aLink );
+                rImpGraphic.ImplSetLink(aLink);
         }
         else
         {

vcl/source/gdi/pdfextoutdevdata.cxx

@@ -846,7 +846,7 @@ bool PDFExtOutDevData::HasAdequateCompression( const Graphic &rGraphic,
         // 4 means CMYK, which is not handled.
         return false;
 
-    Size aSize = rGraphic.GetSizePixel();
+    const Size aSize = rGraphic.GetSizePixel();
 
     // small items better off as PNG anyway
     if ( aSize.Width() < 32 &&