提供创建图形缓冲区的方法，该缓冲区可用于双缓冲。
Provides methods for creating graphics buffers that can be used for double buffering.
如果某个缓冲区已被分配但尚未释放，则释放当前的图形缓冲区。
Disposes of the current graphics buffer, if a buffer has been allocated and has not yet been disposed.
缓冲的图形要求更新的图形资料必须最先写入缓冲区中。
Buffered graphics require that the updated graphics data is first written to a buffer.
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