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Missing window areas in VNC backend #85
Description
I run the VNC backend on a Raspberry Pi 3B. During the experiment, I observed that certain areas of the window were missing on the screen. I am curious whether this issue might be caused by the tx->damage_region parameter.
Activity
jserv commentedon Oct 19, 2026
#163 reworked the VNC backend: each scan-out now reports exactly the rectangle it wrote as damage (the region is initialized once instead of being re-created on every update), and pointer events are no longer dispatched from uninitialized state. Could you retest on the Raspberry Pi with current main and say whether windows still have missing areas? If they do, one remaining suspect is that the framebuffer handed to neatvnc is drawn into again while it may still be encoding, with no second buffer.
huaxinliao commentedon Oct 19, 2026
I would retest on the Raspberry Pi with current main on the weekend.
huaxinliao commentedon Oct 23, 2026
Retested on the Raspberry Pi with current main branch. Windows still have missing areas, but only while dragging: the area a window is redrawn at the top while the lower part still shows the old contents. Once I stop dragging, it repaints correctly.
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