acquireFrontDoc acquireFrontShapes clear create fromHandle getBackDoc getBackShapes getBackShapesHandle getTag GiPlaying impl isStopping release releaseDoc releaseShapes stop submitBackDoc submitBackShapes toHandle ~GiPlaying

acquireFrontDoc() long GiPlaying::acquireFrontDoc ( ) 得到显示用的图形文档句柄，需要并发保护 函数调用图: 这是这个函数的调用关系图: