PPTX export, custom shape, bitmap fill: fix source vs fill rect confusion

Commit 682ab83252 (drawingML
export\import: cropping of shape's fill texture, 2014-02-12) improved
the DOCX filter, so the fill rectangle of a custom shape with bitmap
fill is handled.

The problem is drawingML has a source rectangle (similar to our crop
rect) to limit the usage of the bitmap, and also it has a fill rectangle
in case some margin is wanted around a stretched bitmap. We don't have a
mapping for the later.

Fix the problem by limiting the above work for DOCX, this way PPTX's
source rectangle won't be turned into a stretch's fill rectangle.

This way no unwanted margins will appear around the image -- those
margins can be large enough that the image effectively disappears on
export.

Change-Id: Ic35063545a56eec9eaf885bbd397a854705d134f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/96025
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

oox/source/export/drawingml.cxx

@@ -1443,6 +1443,12 @@ void DrawingML::WriteXGraphicBlipFill(uno::Reference<beans::XPropertySet> const
 
     WriteXGraphicBlip(rXPropSet, rxGraphic, bRelPathToMedia);
 
+    if (GetDocumentType() != DOCUMENT_DOCX)
+    {
+        // Write the crop rectangle of Impress as a source rectangle.
+        WriteSrcRectXGraphic(rXPropSet, rxGraphic);
+    }
+
     if (bWriteMode)
     {
         WriteXGraphicBlipMode(rXPropSet, rxGraphic);
@@ -1538,6 +1544,13 @@ void DrawingML::WriteSrcRectXGraphic(uno::Reference<beans::XPropertySet> const &
 void DrawingML::WriteXGraphicStretch(uno::Reference<beans::XPropertySet> const & rXPropSet,
                                      uno::Reference<graphic::XGraphic> const & rxGraphic)
 {
+    if (GetDocumentType() != DOCUMENT_DOCX)
+    {
+        // Limiting the area used for stretching is not supported in Impress.
+        mpFS->singleElementNS(XML_a, XML_stretch);
+        return;
+    }
+
     mpFS->startElementNS(XML_a, XML_stretch);
 
     bool bCrop = false;

sd/qa/unit/export-tests-ooxml1.cxx

@@ -90,6 +90,7 @@ public:
     void testRoundtripOwnLineStyles();
     void testRoundtripPrstDash();
     void testDashOnHairline();
+    void testCustomshapeBitmapfillSrcrect();
 
     CPPUNIT_TEST_SUITE(SdOOXMLExportTest1);
 
@@ -129,6 +130,7 @@ public:
     CPPUNIT_TEST(testRoundtripOwnLineStyles);
     CPPUNIT_TEST(testRoundtripPrstDash);
     CPPUNIT_TEST(testDashOnHairline);
+    CPPUNIT_TEST(testCustomshapeBitmapfillSrcrect);
 
     CPPUNIT_TEST_SUITE_END();
 
@@ -1070,6 +1072,29 @@ void SdOOXMLExportTest1::testDashOnHairline()
     assertXPath(pXmlDoc, sXmlPath, 11);
 }
 
+void SdOOXMLExportTest1::testCustomshapeBitmapfillSrcrect()
+{
+    ::sd::DrawDocShellRef xDocShRef = loadURL(
+        m_directories.getURLFromSrc("sd/qa/unit/data/pptx/customshape-bitmapfill-srcrect.pptx"),
+        PPTX);
+    utl::TempFile tempFile;
+    xDocShRef = saveAndReload(xDocShRef.get(), PPTX, &tempFile);
+    xDocShRef->DoClose();
+
+    xmlDocUniquePtr pXmlDoc = parseExport(tempFile, "ppt/slides/slide1.xml");
+    const OString sXmlPath = "//a:blipFill/a:srcRect";
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected: 1
+    // - Actual  : 0
+    // - XPath '//a:blipFill/a:srcRect' number of nodes is incorrect
+    // i.e. <a:srcRect> was exported as <a:fillRect> in <a:stretch>, which made part of the image
+    // invisible.
+    double fLeftPercent = std::round(getXPath(pXmlDoc, sXmlPath, "l").toDouble() / 1000);
+    CPPUNIT_ASSERT_EQUAL(4.0, fLeftPercent);
+    double fRightPercent = std::round(getXPath(pXmlDoc, sXmlPath, "r").toDouble() / 1000);
+    CPPUNIT_ASSERT_EQUAL(4.0, fRightPercent);
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(SdOOXMLExportTest1);
 
 CPPUNIT_PLUGIN_IMPLEMENT();