adding new constructor for best dc-compatibility of bitmaps

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74241 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/bitmap.h

@@ -107,6 +107,9 @@ public:
     wxBitmap(CGImageRef image);
     wxBitmap(WX_NSImage image);
 
+    // Create a bitmap compatible with the given DC
+    wxBitmap(int width, int height, const wxDC& dc);
+    
     // If depth is omitted, will create a bitmap compatible with the display
     wxBitmap(int width, int height, int depth = -1) { (void)Create(width, height, depth); }
     wxBitmap(const wxSize& sz, int depth = -1) { (void)Create(sz, depth); }