tdf#127696 PPTX export: fix lost outline character formatting

Now outline font property export is supported partially in PPTX
export and in text shape export in other OOXML formats.

Note: OOXML/MSO has customizable Text Fill and Text Outline in
Format Text Effects, while LO has only simple and buggy outline
character formatting property, showing only white or completely
transparent outline fill color. Transparency issues and the buggy
outline font handling of LO (e.g. 1% font color (line) transparency
results 100% fill transparency of the outline text) haven't been
handled yet.

Change-Id: Ic34bce4efd4a544d799b1d89af1107c4918061d8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/126996
Tested-by: László Németh <nemeth@numbertext.org>
Reviewed-by: László Németh <nemeth@numbertext.org>

2 files changed, 30 insertions, 2 deletions

diff --git a/oox/source/drawingml/textcharacterproperties.cxx b/oox/source/drawingml/textcharacterproperties.cxx
index 7ffeaeba8da2..9d568cd5cabb 100644
--- a/oox/source/drawingml/textcharacterproperties.cxx
+++ b/oox/source/drawingml/textcharacterproperties.cxx
@@ -111,6 +111,7 @@ void TextCharacterProperties::pushToPropMap( PropertyMap& rPropMap, const XmlFil
     if ( maFillProperties.moFillType.has() )
     {
         Color aColor = maFillProperties.getBestSolidColor();
+        bool bContoured = false;
 
         // noFill doesn't exist for characters. Map noFill to 99% transparency
         if (maFillProperties.moFillType.get() == XML_noFill)
@@ -124,7 +125,11 @@ void TextCharacterProperties::pushToPropMap( PropertyMap& rPropMap, const XmlFil
         {
             Color aLineColor = moTextOutlineProperties.get().maLineFill.getBestSolidColor();
             sal_Int16 nLineTransparency = aLineColor.getTransparency();
-            if (nLineTransparency < aColor.getTransparency())
+
+            // tdf#127696 If the text color is white (and the outline color doesn't dominate),
+            //            then this is contoured text in LO.
+            if (nLineTransparency < aColor.getTransparency()
+                || (bContoured = aColor.getColor(rFilter.getGraphicHelper()) == COL_WHITE))
                 aColor = aLineColor;
         }
         rPropMap.setProperty(PROP_CharColor, aColor.getColor(rFilter.getGraphicHelper()));
@@ -133,6 +138,7 @@ void TextCharacterProperties::pushToPropMap( PropertyMap& rPropMap, const XmlFil
         rPropMap.setProperty(PROP_CharColorTintOrShade, aColor.getTintOrShade());
         rPropMap.setProperty(PROP_CharColorLumMod, aColor.getLumMod());
         rPropMap.setProperty(PROP_CharColorLumOff, aColor.getLumOff());
+        rPropMap.setProperty(PROP_CharContoured, bContoured);
 
         if (aColor.hasTransparency())
         {
diff --git a/oox/source/export/drawingml.cxx b/oox/source/export/drawingml.cxx
index 8581535357a0..d87c6cccddee 100644
--- a/oox/source/export/drawingml.cxx
+++ b/oox/source/export/drawingml.cxx
@@ -2201,9 +2201,31 @@ void DrawingML::WriteRunProperties( const Reference< XPropertySet >& rRun, bool
                 nTransparency = MAX_PERCENT - (nTransparency * PER_PERCENT);
             }
 
+            bool bContoured = false;
+            if (GetProperty(rXPropSet, "CharContoured"))
+                bContoured = *o3tl::doAccess<bool>(mAny);
+
+            // tdf#127696 If the CharContoured is true, then the text color is white and the outline color is the CharColor.
+            if (bContoured)
+            {
+                mpFS->startElementNS(XML_a, XML_ln);
+                if (color == COL_AUTO)
+                {
+                    mbIsBackgroundDark ? WriteSolidFill(COL_WHITE) : WriteSolidFill(COL_BLACK);
+                }
+                else
+                {
+                    color.SetAlpha(255);
+                    if (!WriteCharColor(rXPropSet))
+                        WriteSolidFill(color, nTransparency);
+                }
+                mpFS->endElementNS(XML_a, XML_ln);
+
+                WriteSolidFill(COL_WHITE);
+            }
             // tdf#104219 In LibreOffice and MS Office, there are two types of colors:
             // Automatic and Fixed. OOXML is setting automatic color, by not providing color.
-            if( color != COL_AUTO )
+            else if( color != COL_AUTO )
             {
                 color.SetAlpha(255);
                 // TODO: special handle embossed/engraved