Implement wxBitmap(const wxCursor&) constructor for OSX

include/wx/osx/bitmap.h

@@ -126,6 +126,11 @@ public:
     // Convert from wxIcon
     wxBitmap(const wxIcon& icon) { CopyFromIcon(icon); }
 
+#if wxOSX_USE_COCOA
+    // Convert from wxCursor
+    wxBitmap(const wxCursor &cursor);
+#endif
+
     virtual ~wxBitmap() {}
 
     wxImage ConvertToImage() const wxOVERRIDE;

include/wx/osx/cocoa/private.h

@@ -45,6 +45,7 @@ void WXDLLIMPEXP_CORE wxOSXSetImageSize(WX_NSImage image, CGFloat width, CGFloat
 wxBitmap WXDLLIMPEXP_CORE wxOSXCreateSystemBitmap(const wxString& id, const wxString &client, const wxSize& size);
 WXWindow WXDLLIMPEXP_CORE wxOSXGetMainWindow();
 WXWindow WXDLLIMPEXP_CORE wxOSXGetKeyWindow();
+WXImage WXDLLIMPEXP_CORE wxOSXGetNSImageFromNSCursor(const WXHCURSOR cursor);
 
 class WXDLLIMPEXP_FWD_CORE wxDialog;
 

interface/wx/bitmap.h

@@ -359,9 +359,6 @@ public:
         This can be useful to display a cursor as it cannot be drawn directly
         on a window.
 
-        This constructor only exists in wxMSW and wxGTK (where it is
-        implemented for GTK+ 2.8 or later) only.
-
         @param cursor A valid wxCursor.
 
         @since 3.1.0

src/osx/carbon/utilscocoa.mm

@@ -577,6 +577,11 @@ WX_NSCursor wxMacCocoaCreateStockCursor( int cursor_type )
     return cursor;
 }
 
+WXImage WXDLLIMPEXP_CORE wxOSXGetNSImageFromNSCursor(const WXHCURSOR cursor)
+{
+    return [(NSCursor *)cursor image];
+}
+
 //  C-based style wrapper routines around NSCursor
 WX_NSCursor  wxMacCocoaCreateCursorFromCGImage( CGImageRef cgImageRef, float hotSpotX, float hotSpotY )
 {

src/osx/core/bitmap.cpp

@@ -919,6 +919,13 @@ wxBitmap::wxBitmap(WXImage image)
     (void)Create(image);
 }
 
+#if wxOSX_USE_COCOA
+wxBitmap::wxBitmap(const wxCursor &cursor)
+{
+    m_refData = new wxBitmapRefData( wxOSXGetNSImageFromNSCursor( cursor.GetHCURSOR() ) );
+}
+#endif
+
 bool wxBitmap::Create(WXImage image)
 {
     UnRef();