tdf#126533 docx export: page background vml fill: basic image

This is the absolute minimal possible combination
to export an image to page background.

However, none of the other properties
that I see strike me as particularly important
or connected to our image properties.

Plus MSO ignores things like "frame" and tiles anyway.

Import is also pretty basic, so any improvement to imports
can also add the corresponding export component.

For example: it seems like MSO tiles all images
based on somewhat magical sizing (they do always export
o:targetscreensize="999<w>,999<h>" which we ignore).
But note that MSO does pixel display and not logical display
for page background - something we do NOT want to emulate,
so any importing of properties needs to be done intelligently.

But MSO's UI only allows for basic image insertion,
so very few files will have complex settings.

make CppunitTest_sw_ooxmlexport21 \
    CPPUNIT_TEST_NAME=testTdf126533_pageBitmap

Change-Id: Ib410594d1e3377aefb8ee94f209a1a1155154b17
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163203
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>

1 files changed, 18 insertions, 4 deletions

diff --git a/sw/source/filter/ww8/docxexport.cxx b/sw/source/filter/ww8/docxexport.cxx
index 869862909678..fcb55e19c314 100644
--- a/sw/source/filter/ww8/docxexport.cxx
+++ b/sw/source/filter/ww8/docxexport.cxx
@@ -1911,11 +1911,25 @@ void DocxExport::WriteMainText()
     // Write background page color
     if (std::unique_ptr<SvxBrushItem> oBrush = getBackground(); oBrush)
     {
-        Color backgroundColor = oBrush->GetColor();
-        OString aBackgroundColorStr = msfilter::util::ConvertColor(backgroundColor);
+        m_pDocumentFS->startElementNS(XML_w, XML_background, FSNS(XML_w, XML_color),
+                                      msfilter::util::ConvertColor(oBrush->GetColor()));
 
-        m_pDocumentFS->singleElementNS(XML_w, XML_background, FSNS(XML_w, XML_color),
-                                       aBackgroundColorStr);
+        const GraphicObject* pGraphicObj = oBrush->GetGraphicObject();
+        if (pGraphicObj) // image/pattern/texture
+        {
+            const OUString aRelId = m_pDrawingML->writeGraphicToStorage(pGraphicObj->GetGraphic());
+            if (!aRelId.isEmpty())
+            {
+                m_pDocumentFS->startElementNS(XML_v, XML_background);
+
+                m_pDocumentFS->singleElementNS(XML_v, XML_fill, FSNS(XML_r, XML_id), aRelId,
+                                            XML_type, "frame");
+
+                m_pDocumentFS->endElementNS(XML_v, XML_background);
+            }
+        }
+
+        m_pDocumentFS->endElementNS(XML_w, XML_background);
     }
 
     // body