tdf#92524 ooxmlexport: recognize COL_AUTO for RES_BACKGROUND

FormatBackground was always returning the actual color
instead of AUTO when the color was COL_AUTO because ConvertColor
is being passed Color.GetRGBColor() instead of just Color.

There are three sections here:
-XML_fillcolor: looks like it accepts values like "green" and
"teal". Unclear from documenation whether auto is allowed.
-XML_srgbClr: only accepts rgb number, not auto
-XML_fill: needs this fix - test document available.

Since the section can't globally handle "auto", I left XML_fillcolor
alone, waiting for a proof bug report.

Change-Id: Idecb6a32fba814a6fb3aeb6cc015d793ba6f8cf9
Reviewed-on: https://gerrit.libreoffice.org/43975
Reviewed-by: Justin Luth <justin_luth@sil.org>
Tested-by: Justin Luth <justin_luth@sil.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/sw/source/filter/ww8/docxattributeoutput.cxx b/sw/source/filter/ww8/docxattributeoutput.cxx
index a9ef70d22119..6cbd0a6cdc18 100644
--- a/sw/source/filter/ww8/docxattributeoutput.cxx
+++ b/sw/source/filter/ww8/docxattributeoutput.cxx
@@ -8109,7 +8109,8 @@ boost::optional<sal_Int32> lcl_getDmlAlpha(const SvxBrushItem& rBrush)
 
 void DocxAttributeOutput::FormatBackground( const SvxBrushItem& rBrush )
 {
-    OString sColor = msfilter::util::ConvertColor( rBrush.GetColor().GetRGBColor() );
+    const Color aColor = rBrush.GetColor();
+    OString sColor = msfilter::util::ConvertColor( aColor.GetRGBColor() );
     boost::optional<sal_Int32> oAlpha = lcl_getDmlAlpha(rBrush);
     if (m_rExport.SdrExporter().getTextFrameSyntax())
     {
@@ -8159,6 +8160,9 @@ void DocxAttributeOutput::FormatBackground( const SvxBrushItem& rBrush )
         OString sOriginalFill = OUStringToOString(
                 m_sOriginalBackgroundColor, RTL_TEXTENCODING_UTF8 );
 
+        if ( aColor == COL_AUTO )
+            sColor = "auto";
+
         if( !m_pBackgroundAttrList.is() )
         {
             m_pBackgroundAttrList = FastSerializerHelper::createAttrList();