tdf#113696 Add mimetype to image element

Otherwise browsers don't recognize base64 encoded svg files.

Change-Id: I54d0b87c52a1ca9da1d820751ae32159b88ed28f
Reviewed-on: https://gerrit.libreoffice.org/45528
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
(cherry picked from commit 32efde5cef2b8516a9decd0bf7091d7def1da971)
Reviewed-on: https://gerrit.libreoffice.org/45674

3 files changed, 30 insertions, 21 deletions

diff --git a/xmloff/source/core/xmlexp.cxx b/xmloff/source/core/xmlexp.cxx
index f8970a58f2c2..329fe258b766 100644
--- a/xmloff/source/core/xmlexp.cxx
+++ b/xmloff/source/core/xmlexp.cxx
@@ -1885,6 +1885,24 @@ OUString SvXMLExport::AddEmbeddedGraphicObject( const OUString& rGraphicObjectUR
     return sRet;
 }
 
+Reference< XInputStream > SvXMLExport::GetEmbeddedGraphicObjectStream( const OUString& rGraphicObjectURL )
+{
+    if( (getExportFlags() & SvXMLExportFlags::EMBEDDED) &&
+        rGraphicObjectURL.startsWith( msGraphicObjectProtocol ) &&
+        mxGraphicResolver.is() )
+    {
+        Reference< XBinaryStreamResolver > xStmResolver( mxGraphicResolver, UNO_QUERY );
+
+        if( xStmResolver.is() )
+        {
+            Reference< XInputStream > xIn( xStmResolver->getInputStream( rGraphicObjectURL ) );
+            return xIn;
+        }
+    }
+
+    return nullptr;
+}
+
 bool SvXMLExport::AddEmbeddedGraphicObjectAsBase64( const OUString& rGraphicObjectURL )
 {
     bool bRet = false;
diff --git a/xmloff/source/draw/shapeexport.cxx b/xmloff/source/draw/shapeexport.cxx
index e6752066a89e..7f43937f0c7d 100644
--- a/xmloff/source/draw/shapeexport.cxx
+++ b/xmloff/source/draw/shapeexport.cxx
@@ -82,6 +82,7 @@
 #include <com/sun/star/document/XStorageBasedDocument.hpp>
 
 #include <comphelper/classids.hxx>
+#include <comphelper/graphicmimetype.hxx>
 #include <comphelper/processfactory.hxx>
 #include <comphelper/storagehelper.hxx>
 
@@ -2352,6 +2353,16 @@ void XMLShapeExport::ImpExportGraphicObjectShape(
         }
 
         {
+            // We can't guess the mimetype from sImageURL because the image type might be changed
+            // while creating the stream (by SvXMLGraphicInputStream). So we first need to create
+            // the stream, get the mime type and then write the stream.
+            uno::Reference<io::XInputStream> xInputStream(
+                mrExport.GetEmbeddedGraphicObjectStream(sImageURL));
+            OUString aMimeType(
+                comphelper::GraphicMimeTypeHelper::GetMimeTypeForImageStream(xInputStream));
+            if (!aMimeType.isEmpty())
+                GetExport().AddAttribute(XML_NAMESPACE_LO_EXT, "mime-type", aMimeType);
+
             SvXMLElementExport aOBJ(mrExport, XML_NAMESPACE_DRAW, XML_IMAGE, true, true);
 
             if( !sImageURL.isEmpty() )
diff --git a/xmloff/source/text/txtparae.cxx b/xmloff/source/text/txtparae.cxx
index 4ab345e599c3..eaaf3ff0f2aa 100644
--- a/xmloff/source/text/txtparae.cxx
+++ b/xmloff/source/text/txtparae.cxx
@@ -117,7 +117,6 @@
 #include <vector>
 #include <algorithm>
 #include <iterator>
-#include <comphelper/processfactory.hxx>
 #include <comphelper/graphicmimetype.hxx>
 
 using namespace ::std;
@@ -3016,25 +3015,6 @@ void XMLTextParagraphExport::exportContour(
                               true, true );
 }
 
-static OUString getMimeType(const OUString& sImageUrl)
-{
-    // Create the graphic to retrieve the mimetype from it
-    Reference< XGraphicProvider > xProvider = css::graphic::GraphicProvider::create(comphelper::getProcessComponentContext());
-    Sequence< PropertyValue > aMediaProperties( 1 );
-    aMediaProperties[0].Name = "URL";
-    aMediaProperties[0].Value <<= sImageUrl;
-    Reference< XGraphic > xGraphic( xProvider->queryGraphic( aMediaProperties ) );
-
-    OUString aSourceMimeType;
-    Reference<XPropertySet> const xGraphicPropertySet(xGraphic, UNO_QUERY);
-    if (xGraphicPropertySet.is() && // it's null if it's an external link
-        (xGraphicPropertySet->getPropertyValue("MimeType") >>= aSourceMimeType))
-    {
-        return aSourceMimeType;
-    }
-    return OUString("");
-}
-
 void XMLTextParagraphExport::_exportTextGraphic(
         const Reference < XPropertySet > & rPropSet,
         const Reference < XPropertySetInfo > & rPropSetInfo )
@@ -3101,7 +3081,7 @@ void XMLTextParagraphExport::_exportTextGraphic(
     OUString aSourceMimeType = GetExport().GetImageFilterName();
     // otherwise determine mimetype from graphic
     if ( aSourceMimeType.isEmpty() )
-        aSourceMimeType = getMimeType(sOrigURL);
+        aSourceMimeType = comphelper::GraphicMimeTypeHelper::GetMimeTypeForImageUrl(sOrigURL);
     else //  !aSourceMimeType.isEmpty()
     {
         const OString aExt( OUStringToOString( aSourceMimeType, RTL_TEXTENCODING_ASCII_US ) );