Screenshot of warped display

[RobertoAlda]

I'm tryng to take a screenshot of the warped screen, but all my tries failed.
I tried:

• nvidia capture sdk samples (https://developer.nvidia.com/capture-sdk)
• scrot
• gnome-screenshot
• gstreamer ximagesrc

allo of these take a screenshot, but without wapring and blending.
I need to do this for testing the correctness of wapr and blend results.
How can i do it?
Any help would be appreciated, thank you.

[aaronp24]

We don't currently have a mechanism for capturing frames after warp & blend. Your best bet might be to query output CRCs using NVKMS_IOCTL_QUERY_DPY_CRC32. However, you might run into trouble if the Xorg driver is the modeset owner and you're trying to capture CRCs from another modeset client. You'd need to modify nvkms.c to remove that check if you want to do that.