[fix] wbuilder blitbuffer issue (#3514)
[fix] wbuilder blitbuffer issue (#3514)


koreader/koreader,houqp/koreader,poire-z/koreader,apletnev/koreader,Markismus/koreader,NiLuJe/koreader,Frenzie/koreader,mwoz123/koreader,NiLuJe/koreader,pazos/koreader,Hzj-jie/koreader,Frenzie/koreader,mihailim/koreader,poire-z/koreader,koreader/koreader,lgeek/koreader