tdf#126708 Fix EMF image size in CLI .doc export

Implement EMF image size detection, to fix this bug where an EMF image
gets zero size when exported to .doc format from the command line.

Change-Id: If980c5d65d4880150815fd1df9704d9c1b3b93c9
Reviewed-on: https://gerrit.libreoffice.org/77031
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

3 files changed, 62 insertions, 4 deletions

diff --git a/sw/qa/extras/ww8export/data/tdf126708_containsemf.odt b/sw/qa/extras/ww8export/data/tdf126708_containsemf.odt
new file mode 100644
index 000000000000..31b0fab8d02d
--- /dev/null
+++ b/sw/qa/extras/ww8export/data/tdf126708_containsemf.odt
diff --git a/sw/qa/extras/ww8export/ww8export3.cxx b/sw/qa/extras/ww8export/ww8export3.cxx
index dfb20c81fc67..a38424cc3ce1 100644
--- a/sw/qa/extras/ww8export/ww8export3.cxx
+++ b/sw/qa/extras/ww8export/ww8export3.cxx
@@ -13,6 +13,7 @@
 #include <com/sun/star/beans/XPropertySet.hpp>
 #include <com/sun/star/container/XIndexAccess.hpp>
 #include <com/sun/star/drawing/FillStyle.hpp>
+#include <com/sun/star/graphic/XGraphic.hpp>
 #include <com/sun/star/text/XFormField.hpp>
 #include <com/sun/star/text/XTextTable.hpp>
 #include <com/sun/star/text/XTextTablesSupplier.hpp>
@@ -276,6 +277,23 @@ DECLARE_WW8EXPORT_TEST(testImageCommentAtChar, "image-comment-at-char.doc")
                          getProperty<OUString>(getRun(xPara, 5), "TextPortionType"));
 }
 
+DECLARE_WW8EXPORT_TEST(testTdf126708emf, "tdf126708_containsemf.odt")
+{
+    auto xShape = getShape(1);
+    // First check the size of the EMF graphic contained in the shape.
+    auto xGraphic = getProperty< uno::Reference<graphic::XGraphic> >(
+        xShape, "Graphic");
+    auto xSize = getProperty<awt::Size>(xGraphic, "Size100thMM");
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(8501), xSize.Height);
+    CPPUNIT_ASSERT_EQUAL(sal_Int32(18939), xSize.Width);
+
+    // Now check that the shape itself has a decent size.
+    // This size varies slightly when round tripping through doc format.
+    xSize = getProperty<awt::Size>(xShape, "Size");
+    CPPUNIT_ASSERT(abs(xSize.Height - 7629) <= 6);
+    CPPUNIT_ASSERT(abs(xSize.Width - 17000) <= 6);
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/source/filter/graphicfilter2.cxx b/vcl/source/filter/graphicfilter2.cxx
index 27dd780b57c8..8839807aa962 100644
--- a/vcl/source/filter/graphicfilter2.cxx
+++ b/vcl/source/filter/graphicfilter2.cxx
@@ -1044,12 +1044,52 @@ bool GraphicDescriptor::ImpDetectWMF( SvStream&, bool )
     return bRet;
 }
 
-bool GraphicDescriptor::ImpDetectEMF( SvStream&, bool )
+bool GraphicDescriptor::ImpDetectEMF( SvStream& rStm, bool bExtendedInfo )
 {
-    bool bRet = aPathExt.startsWith( "emf" );
-    if (bRet)
-        nFormat = GraphicFileFormat::EMF;
+    sal_uInt32 nRecordType = 0;
+    bool bRet = false;
+
+    sal_Int32 nStmPos = rStm.Tell();
+    rStm.SetEndian( SvStreamEndian::LITTLE );
+    rStm.ReadUInt32( nRecordType );
+
+    if ( nRecordType == 0x00000001 )
+    {
+        sal_uInt32 nHeaderSize = 0;
+        sal_Int32 nBoundLeft = 0, nBoundTop = 0, nBoundRight = 0, nBoundBottom = 0;
+        sal_Int32 nFrameLeft = 0, nFrameTop = 0, nFrameRight = 0, nFrameBottom = 0;
+        sal_uInt32 nSignature = 0;
+
+        rStm.ReadUInt32( nHeaderSize );
+        rStm.ReadInt32( nBoundLeft );
+        rStm.ReadInt32( nBoundTop );
+        rStm.ReadInt32( nBoundRight );
+        rStm.ReadInt32( nBoundBottom );
+        rStm.ReadInt32( nFrameLeft );
+        rStm.ReadInt32( nFrameTop );
+        rStm.ReadInt32( nFrameRight );
+        rStm.ReadInt32( nFrameBottom );
+        rStm.ReadUInt32( nSignature );
+
+        if ( nSignature == 0x464d4520 )
+        {
+            nFormat = GraphicFileFormat::EMF;
+            bRet = true;
 
+            if ( bExtendedInfo )
+            {
+                // size in pixels
+                aPixSize.setWidth( nBoundRight - nBoundLeft + 1 );
+                aPixSize.setHeight( nBoundBottom - nBoundTop + 1 );
+
+                // size in 0.01mm units
+                aLogSize.setWidth( nFrameRight - nFrameLeft + 1 );
+                aLogSize.setHeight( nFrameBottom - nFrameTop + 1 );
+            }
+        }
+    }
+
+    rStm.Seek( nStmPos );
     return bRet;
 }