MCGR: Use tryToRecreateBorder too for transparency

This is similar to 'Use tryToRecreateBorder for better BW comp with LO'
(see commit 8259a99f41367a1d8326c9157fe1902915715879), but now for
transparency gradients.

Change-Id: I1c2e11562fa998c364896d517f4ed3bfe92f6c15
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152508
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>

2 files changed, 37 insertions, 0 deletions

diff --git a/xmloff/qa/unit/data/MCGR_TransparencyBorder_restoration.pptx b/xmloff/qa/unit/data/MCGR_TransparencyBorder_restoration.pptx
new file mode 100644
index 000000000000..f32c4d5e2b21
--- /dev/null
+++ b/xmloff/qa/unit/data/MCGR_TransparencyBorder_restoration.pptx
diff --git a/xmloff/qa/unit/style.cxx b/xmloff/qa/unit/style.cxx
index f4b7f8f08012..3c5c050c0226 100644
--- a/xmloff/qa/unit/style.cxx
+++ b/xmloff/qa/unit/style.cxx
@@ -553,6 +553,43 @@ CPPUNIT_TEST_FIXTURE(XmloffStyleTest, testBorderRestoration)
     SetODFDefaultVersion(nCurrentODFVersion);
 }
 
+CPPUNIT_TEST_FIXTURE(XmloffStyleTest, testTransparencyBorderRestoration)
+{
+    // Load document. It has a shape with transparency gradient build from transparency 100% at
+    // offset 0, transparency 100% at offset 0.4 and transparency 10% at offset 1.0. For better
+    // backward compatibility such gradient is exported with a border of 40% in the transparency
+    // gradient. The color itself is the same for all gradient stops.
+    // When transparency gradient-stops are integrated in ODF strict, the test needs to be adapted.
+    loadFromURL(u"MCGR_TransparencyBorder_restoration.pptx");
+
+    // Backup original ODF default version
+    const SvtSaveOptions::ODFDefaultVersion nCurrentODFVersion(GetODFDefaultVersion());
+
+    // Save to ODF_LATEST which is currently ODF 1.3 extended. Make sure transparency gradient-stop
+    //elements are written with offset 0 and 1, and border is written as 40%.
+    SetODFDefaultVersion(SvtSaveOptions::ODFDefaultVersion::ODFVER_LATEST);
+    save("impress8");
+    xmlDocUniquePtr pXmlDoc = parseExport("styles.xml");
+    OString sPath = "/office:document-styles/office:styles/draw:opacity[1]";
+    assertXPath(pXmlDoc, sPath + "/loext:opacity-stop[2]", "stop-opacity", "0.9");
+    assertXPath(pXmlDoc, sPath + "/loext:opacity-stop[2]", "offset", "1");
+    assertXPath(pXmlDoc, sPath + "/loext:opacity-stop[1]", "stop-opacity", "0");
+    assertXPath(pXmlDoc, sPath + "/loext:opacity-stop[1]", "offset", "0");
+    assertXPath(pXmlDoc, sPath, "border", "40%");
+
+    // Save to ODF 1.3 strict and make sure border, start and end opacity are suitable set.
+    SetODFDefaultVersion(SvtSaveOptions::ODFDefaultVersion::ODFVER_013);
+    save("impress8");
+    pXmlDoc = parseExport("styles.xml");
+    assertXPath(pXmlDoc, sPath + "/loext:opacity-stop", 0);
+    assertXPath(pXmlDoc, sPath, "start", "0%");
+    assertXPath(pXmlDoc, sPath, "end", "90%");
+    assertXPath(pXmlDoc, sPath, "border", "40%");
+
+    // Set back to original ODF default version.
+    SetODFDefaultVersion(nCurrentODFVersion);
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
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