Query whether this volatile bitmap still has valid content.
As the video RAM allocated to this bitmap can be reclaimed at
any time, a return value of true here does not imply that the
next draw operation with this bitmap will succeed. Instead,
the exception VolatileContentDestroyed might then be thrown,
if lost bitmap data is accessed.
Query whether this volatile bitmap still has valid content.
As the video RAM allocated to this bitmap can be reclaimed at
any time, a return value of true here does not imply that the
next draw operation with this bitmap will succeed. Instead,
the exception VolatileContentDestroyed might then be thrown,
if lost bitmap data is accessed.
