Qt 窗口叠加透明，上面窗口可写文本和图片，下面窗口可展示图片或播放视频。目前存在一个问题，当OSD文字设置为某些颜色时，文字会消失。(The Qt window is superimposed transparent, the upper window can write text and pictures, and the lower window can display pictures or play videos. At present, there is a problem that