+Copy constructor. Note that this does not take a fresh copy of the data,
+but instead makes the internal data point to {\it bitmap}'s data. So
+changing one bitmap will change the other. To make a real copy, you can
+use:
+
+\begin{verbatim}
+ wxBitmap newBitmap = oldBitmap.GetSubBitmap(
+ wxRect(0, 0, oldBitmap.GetWidth(), oldBitmap.GetHeight()));
+\end{verbatim}