tdf#128345 pptx export: add transparence gradient in solid fill

In case of solid color fill a transparence gradient was not saved.
OOXML has no separate element for gradient transparency but has
transparency in color gradient stop elements. The patch detects
a transparence gradient, combines it with the fill color and exports
it as gradFill element.
The import was already correct, besides a wrong start or end value
in case of a symmetric gradient, which becomes AXIAL in LibreOffice.

(cherry picked from commit d187f22b7ff73954e1da39fb954c64bc315298cb)

Conflicts:
oox/source/drawingml/fillproperties.cxx
sd/qa/unit/export-tests-ooxml1.cxx

Change-Id: I4243656821629f90125d0408a38165a8a29e6e24
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/100286
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/oox/source/drawingml/fillproperties.cxx b/oox/source/drawingml/fillproperties.cxx
index caa54b82ca34..f963f103d2c8 100644
--- a/oox/source/drawingml/fillproperties.cxx
+++ b/oox/source/drawingml/fillproperties.cxx
@@ -529,10 +529,8 @@ void FillProperties::pushToPropMap( ShapePropertyMap& rPropMap,
                         aGradient.StartColor = sal_Int32(aStartColor.getColor( rGraphicHelper, nPhClr ));
                         aGradient.EndColor = sal_Int32(aEndColor.getColor( rGraphicHelper, nPhClr ));
 
-                        if( aStartColor.hasTransparency() )
-                            nStartTrans = aStartColor.getTransparency()*255/100;
-                        if( aEndColor.hasTransparency() )
-                            nEndTrans = aEndColor.getTransparency()*255/100;
+                        nStartTrans = aStartColor.hasTransparency() ? aStartColor.getTransparency()*255/100 : 0;
+                        nEndTrans = aEndColor.hasTransparency() ? aEndColor.getTransparency()*255/100 : 0;
 
                         aGradient.Border = rtl::math::round(100*nBorder);
                     }