Format_MonoLSB Drawing Error

  Some Chinese characters' strokes may be missing when I use QPainter.drawText under Windows platform.It happens when the size of font is whithin a range,usaually bigger or smaller.It seems like that it doesn't happen on English character.Only in Chinese does this happen.

  For details, please see the picture below.

Code：

if I use ‘font.setPointSize(20)’, the result is abnormal:

But if I use ' font.setPointSize(50); ', the result is normal: