Support bitmap PDF export for Redaction

* Add a new parameter IsRedactMode (SID_IS_REDACT_MODE) to .uno:ExportDirectToPDF
* Make sure the new param makes it into PDFExport as part of FilterData
* Hijack the metafile before being sent to ImplExportPage(), convert to bitmap, and replace the original
* Add a new entry to GenericCommands.xcu to make our button with param visible

* Nitpick: For things to be included in the bitmap conversion,
they need to be added to the metafile before the conversion
in PDFExport::ExportSelection(). Things added after that point
(inside ImplExportPage() for example) will not be bitmapped/pixelized

Change-Id: Iec7020917da920a968ea969b98e53f17eadaa275
Reviewed-on: https://gerrit.libreoffice.org/67108
Tested-by: Jenkins
Reviewed-by: Muhammet Kara <muhammet.kara@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/74201
Tested-by: Muhammet Kara <muhammet.kara@collabora.com>

3 files changed, 60 insertions, 1 deletions

diff --git a/filter/source/pdf/pdfexport.cxx b/filter/source/pdf/pdfexport.cxx
index 88f212fbb609..8e5b9eefdcc5 100644
--- a/filter/source/pdf/pdfexport.cxx
+++ b/filter/source/pdf/pdfexport.cxx
@@ -114,6 +114,8 @@ PDFExport::PDFExport( const Reference< XComponent >& rxSrcDoc,
     mnProgressValue             ( 0 ),
     mbRemoveTransparencies      ( false ),
 
+    mbIsRedactMode              ( false ),
+
     mbHideViewerToolbar         ( false ),
     mbHideViewerMenubar         ( false ),
     mbHideViewerWindowControls  ( false ),
@@ -226,6 +228,24 @@ bool PDFExport::ExportSelection( vcl::PDFWriter& rPDFWriter,
                     if( aMtf.GetActionSize() &&
                              ( !mbSkipEmptyPages || aPageSize.Width || aPageSize.Height ) )
                     {
+                        // We convert the whole metafile into a bitmap to get rid of the
+                        // text covered by redaction shapes
+                        if (mbIsRedactMode)
+                        {
+                            try
+                            {
+                                Graphic aGraph(aMtf);
+                                BitmapEx bmp = aGraph.GetBitmapEx();
+                                Graphic bgraph(bmp);
+                                aMtf = bgraph.GetGDIMetaFile();
+                            }
+                            catch(const Exception& e)
+                            {
+                                SAL_WARN("filter.pdf", "Something went wrong while converting metafile to bitmap. Exception: "
+                                         << e.Message);
+                            }
+                        }
+
                         ImplExportPage(rPDFWriter, rPDFExtOutDevData, aMtf);
                         bRet = true;
                     }
@@ -556,6 +576,9 @@ bool PDFExport::Export( const OUString& rFile, const Sequence< PropertyValue >&
                     rFilterData[ nData ].Value >>= mbExportPlaceholders;
                 else if ( rFilterData[ nData ].Name == "UseReferenceXObject" )
                     rFilterData[ nData ].Value >>= mbUseReferenceXObject;
+                // Redaction & bitmap related stuff
+                else if ( rFilterData[ nData ].Name == "IsRedactMode" )
+                    rFilterData[ nData ].Value >>= mbIsRedactMode;
             }
 
             aContext.URL        = aURL.GetMainURL(INetURLObject::DecodeMechanism::ToIUri);
diff --git a/filter/source/pdf/pdfexport.hxx b/filter/source/pdf/pdfexport.hxx
index 01befed55986..ac9362a01fb2 100644
--- a/filter/source/pdf/pdfexport.hxx
+++ b/filter/source/pdf/pdfexport.hxx
@@ -65,6 +65,8 @@ private:
     sal_Int32           mnProgressValue;
     bool                mbRemoveTransparencies;
 
+    bool                mbIsRedactMode;
+
     OUString            msWatermark;
 
     // these variable are here only to have a location in filter/pdf to set the default
diff --git a/filter/source/pdf/pdffilter.cxx b/filter/source/pdf/pdffilter.cxx
index 5bddb7e1f671..872c515e0543 100644
--- a/filter/source/pdf/pdffilter.cxx
+++ b/filter/source/pdf/pdffilter.cxx
@@ -46,11 +46,12 @@ bool PDFFilter::implExport( const Sequence< PropertyValue >& rDescriptor )
     Sequence< PropertyValue >   aFilterData;
     sal_Int32                   nLength = rDescriptor.getLength();
     const PropertyValue*        pValue = rDescriptor.getConstArray();
+    bool                        bIsRedactMode = false;
     bool                    bRet = false;
     Reference< task::XStatusIndicator > xStatusIndicator;
     Reference< task::XInteractionHandler > xIH;
 
-    for ( sal_Int32 i = 0 ; ( i < nLength ) && !xOStm.is(); ++i)
+    for (sal_Int32 i = 0 ; ( i < nLength ) && !xOStm.is(); ++i)
     {
         if ( pValue[ i ].Name == "OutputStream" )
             pValue[ i ].Value >>= xOStm;
@@ -62,6 +63,12 @@ bool PDFFilter::implExport( const Sequence< PropertyValue >& rDescriptor )
             pValue[i].Value >>= xIH;
     }
 
+    for (sal_Int32 i = 0 ; i < nLength; ++i)
+    {
+        if ( pValue[i].Name == "IsRedactMode")
+            pValue[i].Value >>= bIsRedactMode;
+    }
+
     /* we don't get FilterData if we are exporting directly
        to pdf, but we have to use the last user settings (especially for the CompressMode) */
     if ( !aFilterData.getLength() )
@@ -109,9 +116,36 @@ bool PDFFilter::implExport( const Sequence< PropertyValue >& rDescriptor )
         aCfgItem.ReadBool(  "ExportBookmarks", true );
         aCfgItem.ReadBool(  "ExportHiddenSlides", false );
         aCfgItem.ReadInt32( "OpenBookmarkLevels", -1 );
+
+        aCfgItem.ReadBool( "IsRedactMode", false);
+
         aFilterData = aCfgItem.GetFilterData();
     }
 
+
+    if (bIsRedactMode)
+    {
+        bool bFound = false;
+
+        for (int i = 0; i < aFilterData.getLength(); ++i)
+        {
+            if (aFilterData[i].Name == "IsRedactMode")
+            {
+                aFilterData[i].Value <<= bIsRedactMode;
+                bFound = true;
+                break;
+            }
+        }
+
+        if (!bFound)
+        {
+            sal_Int32 nNewSize = aFilterData.getLength() + 1;
+            aFilterData.realloc( nNewSize );
+            aFilterData[nNewSize - 1].Name = "IsRedactMode";
+            aFilterData[nNewSize - 1].Value <<= bIsRedactMode;
+        }
+    }
+
     if( mxSrcDoc.is() && xOStm.is() )
     {
         PDFExport       aExport( mxSrcDoc, xStatusIndicator, xIH, mxContext );