CODEWITHSUNDEEP
c++qtqnx
Dion
Dion

Reputation: 55

QNX 6.5.0 grab screen or window Qt C++

I need to grab the screen or window in QNX 6.5.0 - 8 times per second. If use standart low-level API function PgReadScreen(), for resolution screen 1920x1080 (24 bit) its very slooow... When create context PdCreateDirectContext(), the driver blocks all other painting. It freezes the screen for a few seconds.

I also looked at the regions, but as I understood, they do not contain graphic data of windows?

Used Qt 5.7.1 with reduced functionality. For example, the function grabWindow() not implemented.

Good idea: use the widget's render() function, but some objects... for example: list of comboBox is widget too. I have to follow and draw it too.

Any ideas?

Upvotes: 1

Views: 490

Answers (1)

Kuba hasn't forgotten Monica
Kuba hasn't forgotten Monica

Reputation: 98485

Window-grabbing is really simple. A top-level QWidget (widget.isWindow()==true) is backed by a QImage backing store. Grabbing this requires no repainting or OS API calls. This answer has a working, mostly complete yet simple implementation of this idea. It should be portable to any platform and any widget as long as the raster backend is used.

Upvotes: 1

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