vcl GDIMetaFile: easier dumping from debugger

Calling a const member function is easy, creating a dumper instance is
not.

Change-Id: I4892f93f6e1d1f17021185bfd24e411c9d705b3b
Reviewed-on: https://gerrit.libreoffice.org/65838Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

include/vcl/gdimtf.hxx

@@ -197,6 +197,9 @@ public:
 
     void            UseCanvas( bool _bUseCanvas );
     bool            GetUseCanvas() const { return m_bUseCanvas; }
+
+    /// Dumps the meta actions as XML in metafile.xml.
+    void dumpAsXml() const;
 };
 
 #endif // INCLUDED_VCL_GDIMTF_HXX

vcl/source/gdi/gdimtf.cxx

@@ -37,6 +37,7 @@
 #include <comphelper/fileformat.h>
 #include <basegfx/polygon/b2dpolygon.hxx>
 #include <vcl/canvastools.hxx>
+#include <vcl/mtfxmldump.hxx>
 
 #include <svmconverter.hxx>
 
@@ -2834,4 +2835,11 @@ void GDIMetaFile::UseCanvas( bool _bUseCanvas )
     m_bUseCanvas = _bUseCanvas;
 }
 
+void GDIMetaFile::dumpAsXml() const
+{
+    SvFileStream aStream("metafile.xml", StreamMode::STD_READWRITE | StreamMode::TRUNC);
+    MetafileXmlDump aDumper;
+    aDumper.dump(*this, aStream);
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */