I need to capture a screenshot of a widget with OpenGL content (using SoQt 1.5.0 classes under Qt5.5), and to save it to a QImage. What I've tried so far is:
- using grabFrameBuffer from the QGLWidget class (which seems to be obsolete since Qt5): it results in a black area
- using grabFramebuffer from the QOpenGLWidget class: the capture doesn't even work and there's no area dedicated to it
- using renderPixmap from the QGLWidget class: it results in a white area
The problem seems to be located in this if condition (which used QGLWidget::grabFrameBuffer() under Qt4.8 and which we are trying to migrate to Qt5.5):
_image = ((QGLWidget*)(
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Does someone have a hint on the matter ?