Retrieves a Cairo context to be used to draw on the #GdkWindow
that created the #GdkDrawingContext.
The returned context is guaranteed to be valid as long as the
#GdkDrawingContext is valid, that is between a call to
gdk_window_begin_draw_frame() and gdk_window_end_draw_frame().
Retrieves a Cairo context to be used to draw on the #GdkWindow that created the #GdkDrawingContext.
The returned context is guaranteed to be valid as long as the #GdkDrawingContext is valid, that is between a call to gdk_window_begin_draw_frame() and gdk_window_end_draw_frame().