added wxGetDisplayPPI() convenience function and wxPrintout::SetPPI*() overloads accepting single wxSize argument

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55761 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/gdicmn.h

@@ -852,6 +852,18 @@ void wxClientDisplayRect(int* x, int* y, int* width, int* height);
 wxRect wxGetClientDisplayRect();
 //@}
 
+/** @ingroup group_funcmacro_gdi */
+//@{
+/**
+    Returns the display resolution in pixels per inch.
+
+    @header{wx/gdicmn.h}
+
+    @since 2.9.0
+*/
+wxSize wxGetDisplayPPI();
+//@}
+
 /** @ingroup group_funcmacro_gdi */
 //@{
 /**