tdf#106059 PDF export: include content of PDF images as an embedded file

Initial step to have vector output for PDF images in the PDF export
result.

Change-Id: I3d08403d3c83e11c63af69312f9af7474dcd2ead
Reviewed-on: https://gerrit.libreoffice.org/34366
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

4 files changed, 65 insertions, 2 deletions

diff --git a/vcl/source/gdi/pdfextoutdevdata.cxx b/vcl/source/gdi/pdfextoutdevdata.cxx
index 89f570345e9d..10b5a31bd369 100644
--- a/vcl/source/gdi/pdfextoutdevdata.cxx
+++ b/vcl/source/gdi/pdfextoutdevdata.cxx
@@ -410,7 +410,7 @@ bool PageSyncData::PlaySyncPageAct( PDFWriter& rWriter, sal_uInt32& rCurGDIMtfAc
                                 if ( !mbGroupIgnoreGDIMtfActions )
                                     mCurrentGraphic = rGraphic;
                             }
-                            else if ( eType == GfxLinkType::NativePng && mParaRects.size() >= 2 )
+                            else if ((eType == GfxLinkType::NativePng || eType == GfxLinkType::NativePdf) && mParaRects.size() >= 2)
                             {
                                 if ( rOutDevData.HasAdequateCompression(rGraphic, mParaRects[0], mParaRects[1]) )
                                     mCurrentGraphic = rGraphic;
@@ -815,7 +815,10 @@ bool PDFExtOutDevData::HasAdequateCompression( const Graphic &rGraphic,
 {
     bool bReduceResolution = false;
 
-    assert( rGraphic.IsLink() && (rGraphic.GetLink().GetType() ==  GfxLinkType::NativeJpg || rGraphic.GetLink().GetType() == GfxLinkType::NativePng));
+    assert(rGraphic.IsLink() &&
+           (rGraphic.GetLink().GetType() == GfxLinkType::NativeJpg ||
+            rGraphic.GetLink().GetType() == GfxLinkType::NativePng ||
+            rGraphic.GetLink().GetType() == GfxLinkType::NativePdf));
 
     // small items better off as PNG anyway
     if ( rGraphic.GetSizePixel().Width() < 32 &&
diff --git a/vcl/source/gdi/pdfwriter_impl.cxx b/vcl/source/gdi/pdfwriter_impl.cxx
index 13bd2fe561f9..9673087b237a 100644
--- a/vcl/source/gdi/pdfwriter_impl.cxx
+++ b/vcl/source/gdi/pdfwriter_impl.cxx
@@ -4967,6 +4967,39 @@ bool PDFWriterImpl::emitAnnotations()
     return true;
 }
 
+bool PDFWriterImpl::emitEmbeddedFiles()
+{
+    for (auto& rEmbeddedFile : m_aEmbeddedFiles)
+    {
+        if (!updateObject(rEmbeddedFile.m_nObject))
+            continue;
+
+        SvMemoryStream aUncompressed;
+        aUncompressed.WriteBytes(rEmbeddedFile.m_aData.getArray(), rEmbeddedFile.m_aData.getLength());
+        aUncompressed.Seek(0);
+        SvMemoryStream aCompressed;
+        ZCodec aZCodec;
+        aZCodec.BeginCompression();
+        aZCodec.Compress(aUncompressed, aCompressed);
+        aZCodec.EndCompression();
+
+        OStringBuffer aLine;
+        aLine.append(rEmbeddedFile.m_nObject);
+        aLine.append(" 0 obj\n");
+        aLine.append("<< /Type /EmbeddedFile /Filter /FlateDecode /Length ");
+        aLine.append(static_cast<sal_Int64>(aCompressed.GetSize()));
+        aLine.append(" >>\nstream\n");
+        CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
+        aLine.setLength(0);
+
+        CHECK_RETURN(writeBuffer(aCompressed.GetData(), aCompressed.GetSize()));
+
+        aLine.append("\nendstream\nendobj\n\n");
+        CHECK_RETURN(writeBuffer(aLine.getStr(), aLine.getLength()));
+    }
+    return true;
+}
+
 #undef CHECK_RETURN
 #define CHECK_RETURN( x ) if( !x ) return false
 
@@ -5057,6 +5090,7 @@ bool PDFWriterImpl::emitCatalog()
 
     // emit annotation objects
     CHECK_RETURN( emitAnnotations() );
+    CHECK_RETURN( emitEmbeddedFiles() );
 
     // emit Catalog
     m_nCatalogObject = createObject();
diff --git a/vcl/source/gdi/pdfwriter_impl.hxx b/vcl/source/gdi/pdfwriter_impl.hxx
index d2f985a8f696..da953ccea6c0 100644
--- a/vcl/source/gdi/pdfwriter_impl.hxx
+++ b/vcl/source/gdi/pdfwriter_impl.hxx
@@ -26,6 +26,7 @@
 
 #include <com/sun/star/lang/Locale.hpp>
 #include <com/sun/star/util/XURLTransformer.hpp>
+#include <com/sun/star/uno/Sequence.h>
 #include <osl/file.hxx>
 #include <rtl/cipher.h>
 #include <rtl/digest.h>
@@ -416,6 +417,20 @@ public:
         }
     };
 
+    /// A PDF embedded file.
+    struct PDFEmbeddedFile
+    {
+        /// ID of the file.
+        sal_Int32 m_nObject;
+        /// Contents of the file.
+        css::uno::Sequence<sal_Int8> m_aData;
+
+        PDFEmbeddedFile()
+            : m_nObject(0)
+        {
+        }
+    };
+
     struct PDFNoteEntry : public PDFAnnotation
     {
         PDFNote                     m_aContents;
@@ -608,6 +623,8 @@ private:
     std::vector<PDFLink>                m_aLinks;
     /// Contains all screen annotations.
     std::vector<PDFScreen> m_aScreens;
+    /// Contains embedded files.
+    std::vector<PDFEmbeddedFile> m_aEmbeddedFiles;
     /* makes correctly encoded for export to PDF URLS
     */
     css::uno::Reference< css::util::XURLTransformer > m_xTrans;
@@ -868,6 +885,8 @@ i12626
     bool emitWidgetAnnotations();
     // writes all annotation objects
     bool emitAnnotations();
+    /// Writes embedded files.
+    bool emitEmbeddedFiles();
     //write the named destination stuff
     sal_Int32 emitNamedDestinations();//i56629
     // writes outline dict and tree
diff --git a/vcl/source/gdi/pdfwriter_impl2.cxx b/vcl/source/gdi/pdfwriter_impl2.cxx
index bc96f0b2cff0..bbfb7176f719 100644
--- a/vcl/source/gdi/pdfwriter_impl2.cxx
+++ b/vcl/source/gdi/pdfwriter_impl2.cxx
@@ -248,6 +248,13 @@ void PDFWriterImpl::implWriteBitmapEx( const Point& i_rPoint, const Size& i_rSiz
                 m_rOuterFace.DrawBitmapEx( aPoint, aSize, aBitmapEx );
             else
                 m_rOuterFace.DrawBitmap( aPoint, aSize, aBitmapEx.GetBitmap() );
+
+            if (i_Graphic.getPdfData().hasElements())
+            {
+                m_aEmbeddedFiles.push_back(PDFEmbeddedFile());
+                m_aEmbeddedFiles.back().m_nObject = createObject();
+                m_aEmbeddedFiles.back().m_aData = i_Graphic.getPdfData();
+            }
         }
     }
 }