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QPainter QPaintDevice and QOpenGLFrameBufferObject Possible Incompatibility



  • Hello,

    I am fairly new to QT development and so maybe not good at understanding documentation very well. I am using a QT5.7 and can see that QPainter needs a QPaintDevice for Initialization in one of the constructors which do not have QOpenGLFrameBufferObject specified in the list of "Inherited by" section of QPaintDevice. Same is reflected in the compilation and I get an error if I do so. Everything is as expected until here.

    But in the documentation of QOpenGLFrameBufferObject I can see a QPainter can be used to draw on this. Is there any other way to make it working with QPainter.

    A bit of task context:
    I am using a video and drawing some shaped over it to reflect my research data and for this I implemented QAbstractVideoSurface. The loading of the current frame converted to QPixMap or QImage becomes very slow and so I am trying options with hardware acceleration of OpenGL.

    First is it a correct thing to try.
    Second if I am missing something in using QOpenGL extention of QT.

    Any other hint to make things faster in realtime processing is appreciated.


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