tdf#88055: Don't export transparent background colour as white

The fix is twofold:
1. retrieve transparency from colour in SvxBackgroundColorItem
(add QueryValue, PutValue methods, use additional memberID to
retrieve alpha channel as a bool property)
2. add CharBackTransparent bool property to Draw [text] shapes,
xmloff needs it to be able to output 'transparent' string instead of
'#XXYYZZ' colour code in ODF format

Change-Id: Id830bd18fd6da5d9a46e2a94aa254d5d2a6b7ebb
Reviewed-on: https://gerrit.libreoffice.org/16182
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/editeng/source/items/textitem.cxx b/editeng/source/items/textitem.cxx
index fa29b6a5c730..d031f10548ca 100644
--- a/editeng/source/items/textitem.cxx
+++ b/editeng/source/items/textitem.cxx
@@ -1871,6 +1871,51 @@ SfxPoolItem* SvxBackgroundColorItem::Create(SvStream& rStrm, sal_uInt16 ) const
     return new SvxBackgroundColorItem( rStrm, Which() );
 }
 
+bool SvxBackgroundColorItem::QueryValue( uno::Any& rVal, sal_uInt8 nMemberId ) const
+{
+    nMemberId &= ~CONVERT_TWIPS;
+    Color aColor = SvxColorItem::GetValue();
+
+    switch( nMemberId )
+    {
+        case MID_GRAPHIC_TRANSPARENT:
+        {
+            rVal <<= Bool2Any (aColor.GetTransparency());
+            break;
+        }
+        default:
+        {
+            rVal <<= (sal_Int32)(aColor.GetColor());
+            break;
+        }
+    }
+    return true;
+}
+
+bool SvxBackgroundColorItem::PutValue( const uno::Any& rVal, sal_uInt8 nMemberId )
+{
+    nMemberId &= ~CONVERT_TWIPS;
+    sal_Int32 nColor = 0;
+    Color aColor = SvxColorItem::GetValue();
+
+    switch( nMemberId )
+    {
+        case MID_GRAPHIC_TRANSPARENT:
+        {
+            aColor.SetTransparency( Any2Bool( rVal ) ? 0xff : 0 );
+            SvxColorItem::SetValue( aColor );
+            break;
+        }
+        default:
+        {
+            if(!(rVal >>= nColor))
+                return false;
+            SvxColorItem::SetValue( Color(nColor) );
+            break;
+        }
+    }
+    return true;
+}
 
 // class SvxColorItem ----------------------------------------------------