Qt中opengl图像与QGraphicsIten叠加显示问题

[qq_36123762]

QGraphicsView用setviewport设置opengl视口，下层opengl刷新显示nv12视频，上层绘制QGraphicsItem。
视频刷新显示时会吧QGraphicsItem覆盖，大神求解啊，，，，

[今天也要元气满满哦]

什么现象，上个代码，或者贴个图片看看呀，我之前遇到过在显示图像的窗口放的所有按钮等控件都会被画上小视频，哈哈

[Kelvin_Ngan]

参考Qt文档的https://doc.qt.io/qt-5/qopenglwidget.html 的Limitations，里面说了

Putting other widgets underneath and making the QOpenGLWidget transparent will not lead to the expected results: The widgets underneath will not be visible. This is because in practice the QOpenGLWidget is drawn before all other regular, non-OpenGL widgets, and so see-through type of solutions are not feasible. Other type of layouts, like having widgets on top of the QOpenGLWidget, will function as expected.

When absolutely necessary, this limitation can be overcome by setting the Qt::WA_AlwaysStackOnTop attribute on the QOpenGLWidget. Be aware however that this breaks stacking order, for example it will not be possible to have other widgets on top of the QOpenGLWidget, so it should only be used in situations where a semi-transparent QOpenGLWidget with other widgets visible underneath is required.