求问fg指令定义在哪里

@macro name=cl
@eval exp="mp.method=universal" cond=mp.us
@if exp=mp.all
@clearlayers page=back
@backlay layer=message cond=mp.keep=="msg"|"back"
@backlay layer=base cond=mp.keep=="back"
@clearlayers page=fore keep=%keep
@copylay srclayer=message destlayer=message srcpage=back destpage=fore cond=mp.keep=="msg"|"back"
@copylay srclayer=base destlayer=base srcpage=back destpage=fore cond=mp.keep=="back"
@endif
@backlay
@freeimage layer=%layer|%lay|0 page=back
@trans * method=%method|crossfade time=%time|200 layer=base
@wt
@endmacro
那个KS里的

;人物淡入显示
;fg us rule=xxx ....则执行Universal Transition
@macro name=fg
@eval exp="mp.method=universal" cond=mp.us
@backlay
@image * layer=%layer|%lay|0 page=back storage=%storage|%file visible=true key=%key left=%l top=%t opacity=%op pos=%pos
@eval exp=colorlight(mp.layer,mp.light,"back",(mp.type|"char"))
@trans * method=%method|crossfade time=%time|200 layer=base
@wt
@endmacro
不仔细找啊你是