surface: use magic number for checking valid of surface

[platform/core/uifw/libtbm.git] / src / tbm_bufmgr_int.h

diff --git a/src/tbm_bufmgr_int.h b/src/tbm_bufmgr_int.h
index cc789db..da0997d 100644 (file)
--- a/src/tbm_bufmgr_int.h
+++ b/src/tbm_bufmgr_int.h
@@ -210,6 +210,8 @@ struct _tbm_bufmgr {
  *
  */
 struct _tbm_surface {
+       unsigned int magic;         /* tbm surface magic number */
+
        tbm_bufmgr bufmgr;                      /* tbm buffer manager */
 
        tbm_surface_info_s info;        /* tbm surface information */