Query whether this volatile bitmap still has valid content.
As the ビデオ RAM 配分するd to this bitmap can be 埋め立てるd at
any time, a return value of true here does not 暗示する that the
next draw 操作／手術 with this bitmap will 後継する. Instead,
the exception VolatileContentDestroyed might then be thrown,
if lost bitmap data is 接近d.
Query whether this volatile bitmap still has valid content.
As the ビデオ RAM 配分するd to this bitmap can be 埋め立てるd at
any time, a return value of true here does not 暗示する that the
next draw 操作／手術 with this bitmap will 後継する. Instead,
the exception VolatileContentDestroyed might then be thrown,
if lost bitmap data is 接近d.
