Fixed wierd screenshot/offscreen buffer issue (#329).
Fixed wierd screenshot/offscreen buffer issue (#329).

svn path=/trunk/libavg/; revision=7524

th3infinity/libavg,libavg/libavg,th3infinity/libavg,scotty007/libavg,th3infinity/libavg,libavg/libavg,scotty007/libavg,yyd01245/libavg,yyd01245/libavg,yyd01245/libavg,th3infinity/libavg,hoodie/libavg,yyd01245/libavg,scotty007/libavg,hoodie/libavg,libavg/libavg,scotty007/libavg,libavg/libavg,hoodie/libavg,hoodie/libavg