RenderTexture在canvas模式下不适用双缓冲
RenderTexture在canvas模式下不适用双缓冲

unsilence/egret-core,wl3780/egret-core,jiangzhonghui/egret-core,unsilence/egret-core,Lanfei/egret-core,jarvys/egret-hacking,SamuelGavin/egret-core,SmallAiTT/egret-core,jiangzhonghui/egret-core,wisdomsword/egret-core,SmallAiTT/egret-core,SamuelGavin/egret-core,Lanfei/egret-core,wl3780/egret-core,jarvys/egret-hacking,wisdomsword/egret-core