Add wxBitmap ctor from wxCursor to wxGTK and wxMSW.

Allow converting wxCursor to wxBitmap in order to draw it, for example.

Closes #15699.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77537 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -76,6 +76,7 @@ All (GUI):
 - Add wxGenericListCtrl::EndEditLabel() (Tim Kosse).
 - Use native renderer for drawing check boxes in wxPropertyGrid (Eran Ifrah).
 - Fix drawing custom colours of wxEnumProperty items in wxPG (Artur Wieczorek).
+- Add wxBitmap ctor from wxCursor.
 
 wxGTK:
 

include/wx/gtk/bitmap.h

@@ -15,6 +15,7 @@ typedef struct _cairo_surface cairo_surface_t;
 #endif
 typedef struct _GdkPixbuf GdkPixbuf;
 class WXDLLIMPEXP_FWD_CORE wxPixelDataBase;
+class WXDLLIMPEXP_FWD_CORE wxCursor;
 
 //-----------------------------------------------------------------------------
 // wxMask
@@ -81,6 +82,7 @@ public:
     wxBitmap(const wxImage& image, int depth = wxBITMAP_SCREEN_DEPTH);
 #endif // wxUSE_IMAGE
     wxBitmap(GdkPixbuf* pixbuf, int depth = 0);
+    wxEXPLICIT wxBitmap(const wxCursor& cursor);
     virtual ~wxBitmap();
 
     bool Create(int width, int height, int depth = wxBITMAP_SCREEN_DEPTH) wxOVERRIDE;

include/wx/msw/bitmap.h

@@ -97,6 +97,12 @@ public:
         CopyFromIcon(icon, transp);
     }
 
+    // Convert from wxCursor
+    wxEXPLICIT wxBitmap(const wxCursor& cursor)
+    {
+        (void)CopyFromCursor(cursor, wxBitmapTransparency_Auto);
+    }
+
     wxBitmap& operator=(const wxIcon& icon)
     {
         (void)CopyFromIcon(icon);

interface/wx/bitmap.h

@@ -346,6 +346,21 @@ public:
     */
     wxBitmap(const wxImage& img, int depth = wxBITMAP_SCREEN_DEPTH);
 
+    /**
+        Creates bitmap corresponding to the given cursor.
+
+        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
+    */
+    explicit wxBitmap(const wxCursor& cursor);
+
     /**
         Destructor.
         See @ref overview_refcount_destruct for more info.

src/gtk/bitmap.cpp

@@ -515,6 +515,19 @@ wxBitmap::wxBitmap(GdkPixmap* pixmap)
 }
 #endif
 
+wxBitmap::wxBitmap(const wxCursor& cursor)
+{
+#if GTK_CHECK_VERSION(2,8,0)
+    if (gtk_check_version(2,8,0) == NULL)
+    {
+        GdkPixbuf *pixbuf = gdk_cursor_get_image(cursor.GetCursor());
+        *this = wxBitmap(pixbuf);
+    }
+#else
+    wxUnusedVar(cursor);
+#endif
+}
+
 wxBitmap::~wxBitmap()
 {
 }