Resolves: tdf#49253 set an initial mask background

the gif in question has gif disposal mode "previous" set
on the first frame

Change-Id: I5234b0bd810af9e8e858dabac373fc4651dbb52e
Reviewed-on: https://gerrit.libreoffice.org/43613
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx b/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx
index 6d4e1ba14f8c..ba0a4705be00 100644
--- a/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx
+++ b/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx
@@ -101,6 +101,10 @@ namespace drawinglayer
 
                     maVirtualDevice->Erase();
                     maVirtualDeviceMask->Erase();
+                    const ::tools::Rectangle aRect(Point(0, 0), aTarget);
+                    maVirtualDeviceMask->SetFillColor(COL_BLACK);
+                    maVirtualDeviceMask->SetLineColor();
+                    maVirtualDeviceMask->DrawRect(aRect);
                 }
             }