tdf#76941 and tdf#87539: docx export image greyscale, watermark, black&white

Thanks to Miklos :)

Change-Id: Ib6344ff654e39bf712d7071545573fb2ec525b63
Reviewed-on: https://gerrit.libreoffice.org/15733Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Joren De Cuyper <jorendc@libreoffice.org>

sw/qa/extras/ooxmlexport/ooxmlexport7.cxx

@@ -948,6 +948,36 @@ DECLARE_OOXMLEXPORT_TEST(testPictureWrapPolygon, "picture-wrap-polygon.docx")
     CPPUNIT_ASSERT_EQUAL(sal_Int32(11), aSeq.getLength());
 }
 
+DECLARE_OOXMLEXPORT_TEST(testPictureColormodeGrayscale, "picture_colormode_grayscale.docx")
+{
+    // THe problem was that the grayscale was not exported
+    xmlDocPtr pXmlDoc = parseExport ("word/document.xml");
+    if (!pXmlDoc)
+        return;
+
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:r/w:drawing/wp:inline/a:graphic/a:graphicData/pic:pic/pic:blipFill/a:blip/a:grayscl", 1);
+}
+
+DECLARE_OOXMLEXPORT_TEST(testPictureColormodeBlackWhite, "picture_colormode_black_white.odt")
+{
+    xmlDocPtr pXmlDoc = parseExport ("word/document.xml");
+    if (!pXmlDoc)
+        return;
+
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:r/w:drawing/wp:anchor/a:graphic/a:graphicData/pic:pic/pic:blipFill/a:blip/a:biLevel", "thresh", "50000");
+}
+
+DECLARE_OOXMLEXPORT_TEST(testPictureColormodeWatermark, "picture_colormode_watermark.odt")
+{
+    xmlDocPtr pXmlDoc = parseExport ("word/document.xml");
+    if (!pXmlDoc)
+        return;
+
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:r/w:drawing/wp:anchor/a:graphic/a:graphicData/pic:pic/pic:blipFill/a:blip/a:lum", "bright", "50000");
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:r/w:drawing/wp:anchor/a:graphic/a:graphicData/pic:pic/pic:blipFill/a:blip/a:lum", "contrast", "-70000");
+}
+
+
 DECLARE_OOXMLEXPORT_TEST(testExportShadow, "bnc637947.odt")
 {
     // The problem was that shadows of shapes from non-OOXML origin were not exported to DrawingML

sw/source/filter/ww8/docxattributeoutput.cxx

@@ -4192,13 +4192,28 @@ void DocxAttributeOutput::FlyFrameGraphic( const SwGrfNode* pGrfNode, const Size
    completely discarding it.
 */
     if ( aRelId.isEmpty() )
-        m_pSerializer->singleElementNS( XML_a, XML_blip,
+        m_pSerializer->startElementNS( XML_a, XML_blip,
             FSEND );
     else
-        m_pSerializer->singleElementNS( XML_a, XML_blip,
+        m_pSerializer->startElementNS( XML_a, XML_blip,
             FSNS( XML_r, nImageType ), aRelId.getStr(),
             FSEND );
 
+    pItem = 0;
+    sal_uInt32 nMode = GRAPHICDRAWMODE_STANDARD;
+
+    if ( pGrfNode && SfxItemState::SET == pGrfNode->GetSwAttrSet().GetItemState(RES_GRFATR_DRAWMODE, true, &pItem))
+    {
+        nMode = static_cast<const SfxEnumItem*>(pItem)->GetValue();
+        if (nMode == GRAPHICDRAWMODE_GREYS)
+            m_pSerializer->singleElementNS (XML_a, XML_grayscl, FSEND);
+        else if (nMode == GRAPHICDRAWMODE_MONO) //black/white has a 0,5 threshold in LibreOffice
+            m_pSerializer->singleElementNS (XML_a, XML_biLevel, XML_thresh, OString::number(50000), FSEND);
+        else if (nMode == GRAPHICDRAWMODE_WATERMARK) //watermark has a brightness/luminance of 0,5 and contrast of -0.7 in LibreOffice
+            m_pSerializer->singleElementNS( XML_a, XML_lum, XML_bright, OString::number(50000), XML_contrast, OString::number(-70000), FSEND );
+    }
+    m_pSerializer->endElementNS( XML_a, XML_blip );
+
     if (pSdrObj){
         WriteSrcRect(pSdrObj);
     }