tdf#126533 DOCX: export page vml fill gradient

Simplistic export of gradient fill.

I just used the existing docxattribute stuff that textboxes
use to export their background as VML fallback.

Note that docxattribute only knows how to export gradient,
not gradientRadial. (Done in follow-up patch.)

Lots of stuff is missing in terms of properly supporting gradients.
But likely fixing page background will fix
the same problem in textboxes etc.

Given how incredibly different LO and MSO are in terms of gradients,
it makes sense to commit this change and at least get the basics
wired in.

make CppunitTest_sw_ooxmlexport21 \
CPPUNIT_TEST_NAME=testTdf126533_pageGradient

Change-Id: I2ac14fdef2fe29609bc8d5a5d8f65b3f0da71889
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163469
Reviewed-by: Justin Luth <jluth@mail.com>
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163866
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>

2 files changed, 22 insertions, 2 deletions

diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport21.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport21.cxx
index d4bc37d5f700..b9b04eafb0f1 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport21.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport21.cxx
@@ -73,10 +73,9 @@ DECLARE_OOXMLEXPORT_TEST(testTdf126533_noPageBitmap, "tdf126533_noPageBitmap.doc
                          getProperty<drawing::FillStyle>(xPageStyle, "FillStyle"));
 }
 
-CPPUNIT_TEST_FIXTURE(Test, testTdf126533_pageGradient)
+DECLARE_OOXMLEXPORT_TEST(testTdf126533_pageGradient, "fill.docx")
 {
     // given a document with a gradient page background
-    loadFromFile(u"fill.docx");
     uno::Reference<beans::XPropertySet> xPageStyle(getStyles("PageStyles")->getByName("Standard"),
                                                    uno::UNO_QUERY);
     CPPUNIT_ASSERT_EQUAL(drawing::FillStyle_GRADIENT,
diff --git a/sw/source/filter/ww8/docxexport.cxx b/sw/source/filter/ww8/docxexport.cxx
index a4c06ab5ac5b..e84bbc48eb20 100644
--- a/sw/source/filter/ww8/docxexport.cxx
+++ b/sw/source/filter/ww8/docxexport.cxx
@@ -55,6 +55,7 @@
 #include <oox/ole/olehelper.hxx>
 
 #include <svx/svdpage.hxx>
+#include <svx/xfillit0.hxx>
 #include <svx/xflbmtit.hxx>
 
 #include <map>
@@ -1916,6 +1917,7 @@ void DocxExport::WriteMainText()
                                       msfilter::util::ConvertColor(oBrush->GetColor()));
 
         const SwAttrSet& rPageStyleAttrSet = m_rDoc.GetPageDesc(0).GetMaster().GetAttrSet();
+        const drawing::FillStyle eFillType = rPageStyleAttrSet.Get(XATTR_FILLSTYLE).GetValue();
         const GraphicObject* pGraphicObj = oBrush->GetGraphicObject();
         if (pGraphicObj) // image/pattern/texture
         {
@@ -1934,6 +1936,25 @@ void DocxExport::WriteMainText()
                 m_pDocumentFS->endElementNS(XML_v, XML_background);
             }
         }
+        else if (eFillType == drawing::FillStyle_GRADIENT)
+        {
+            SfxItemSetFixed<XATTR_FILL_FIRST, XATTR_FILL_LAST> aSet(m_rDoc.GetAttrPool());
+            aSet.Set(rPageStyleAttrSet);
+
+            // Collect all of the gradient attributes into SdrExporter() AttrLists
+            m_pAttrOutput->OutputStyleItemSet(aSet, /*TestForDefault=*/true);
+            assert(SdrExporter().getFlyAttrList().is() && "type and fillcolor are always provided");
+            assert(SdrExporter().getFlyFillAttrList().is() && "color2 is always provided");
+
+            rtl::Reference<FastAttributeList> xFlyAttrList(SdrExporter().getFlyAttrList());
+            rtl::Reference<FastAttributeList> xFillAttrList(SdrExporter().getFlyFillAttrList());
+            m_pDocumentFS->startElementNS(XML_v, XML_background, xFlyAttrList);
+            m_pDocumentFS->singleElementNS(XML_v, XML_fill, xFillAttrList);
+            m_pDocumentFS->endElementNS(XML_v, XML_background);
+
+            SdrExporter().getFlyAttrList().clear();
+            SdrExporter().getFlyFillAttrList().clear();
+        }
 
         m_pDocumentFS->endElementNS(XML_w, XML_background);
     }