tdf#118977 support PDF documents as a clipboard format

On macOS it is possible to copy from a PDF a subset of a document,
which will be transported as a new PDF document containing the
subset.
LibreOffice didn't support PDF as a valid clipboard format and
previously it also didn't support showing PDFs inside the document,
so in such cases it copy-pasted a low resolution bitmap. The result
wasn't good.

As we are now able to display PDF documents as Graphic in LO, we
can also support this use-case. This adds support for the PDF
documents as a clipboard format in general and to the macOS
backend. This commit only adds support for Writer.

Reviewed-on: https://gerrit.libreoffice.org/71364
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
(cherry picked from commit 615202cab983f1f13407f6515aeb047e4e09f6ed)

Change-Id: Ib982b55391b390ae06974b4ad836e376dd722a4c

1 files changed, 14 insertions, 0 deletions

diff --git a/svtools/source/misc/transfer.cxx b/svtools/source/misc/transfer.cxx
index 7db9601c8aa7..03b306daed8b 100644
--- a/svtools/source/misc/transfer.cxx
+++ b/svtools/source/misc/transfer.cxx
@@ -1727,6 +1727,20 @@ bool TransferableDataHelper::GetGraphic( const css::datatransfer::DataFlavor& rF
         if( bRet )
             rGraphic = aBmpEx;
     }
+    else if(SotExchange::GetFormatDataFlavor(SotClipboardFormatId::PDF, aFlavor) &&
+            TransferableDataHelper::IsEqual(aFlavor, rFlavor))
+    {
+        Graphic aGraphic;
+        tools::SvRef<SotStorageStream> xStm;
+        if (GetSotStorageStream(rFlavor, xStm))
+        {
+            if (GraphicConverter::Import(*xStm, aGraphic) == ERRCODE_NONE)
+            {
+                rGraphic = aGraphic;
+                bRet = true;
+            }
+        }
+    }
     else if (SotExchange::GetFormatDataFlavor(SotClipboardFormatId::JPEG, aFlavor) && TransferableDataHelper::IsEqual(aFlavor, rFlavor))
     {
         BitmapEx aBitmapEx;