src/dfb/ifacehelpers.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/dfb/ifacehelpers.cpp
   3 // Purpose:     helpers for dealing with DFB interfaces
   4 // Author:      Vaclav Slavik
   5 // Created:     2006-08-09
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2006 REA Elektronik GmbH
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #include "wx/dfb/ifacehelpers.h"
  19 #include <directfb.h>
  20
  21 //-----------------------------------------------------------------------------
  22 // wxDfbPtr
  23 //-----------------------------------------------------------------------------
  24
  25 // NB: We can't call AddRef() and Release() directly from wxDfbPtr<T> because
  26 //     we don't have full type declarations for them if we don't include
  27 //     <directfb.h> (which user wx headers can't). Fortunately, all DirectFB
  28 //     interfaces are structs with common beginning that contains pointers to
  29 //     AddRef and Release, so we can safely cast interface pointer to void* and
  30 //     then back to arbitrary interface pointer and these calls will still work
  31 //     correctly. For this purpose, we declare a dummy DFB interface here.
  32
  33 DECLARE_INTERFACE(wxDummyDFBInterface)
  34 DEFINE_INTERFACE(wxDummyDFBInterface, )
  35
  36 /* static */
  37 void wxDfbPtrBase::DoAddRef(void *ptr)
  38 {
  39     wxDummyDFBInterface *p = (wxDummyDFBInterface*)ptr;
  40     p->AddRef(p);
  41 }
  42
  43 /* static */
  44 void wxDfbPtrBase::DoRelease(void *ptr)
  45 {
  46     wxDummyDFBInterface *p = (wxDummyDFBInterface*)ptr;
  47     p->Release(p);
  48 }